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7
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1 /* vi:set ts=8 sts=4 sw=4:
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2 *
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3 * VIM - Vi IMproved by Bram Moolenaar
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4 *
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5 * Do ":help uganda" in Vim to read copying and usage conditions.
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6 * Do ":help credits" in Vim to see a list of people who contributed.
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7 * See README.txt for an overview of the Vim source code.
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8 */
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9
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10 /*
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11 * undo.c: multi level undo facility
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12 *
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13 * The saved lines are stored in a list of lists (one for each buffer):
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14 *
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15 * b_u_oldhead------------------------------------------------+
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16 * |
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17 * V
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18 * +--------------+ +--------------+ +--------------+
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19 * b_u_newhead--->| u_header | | u_header | | u_header |
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20 * | uh_next------>| uh_next------>| uh_next---->NULL
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21 * NULL<--------uh_prev |<---------uh_prev |<---------uh_prev |
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22 * | uh_entry | | uh_entry | | uh_entry |
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23 * +--------|-----+ +--------|-----+ +--------|-----+
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24 * | | |
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25 * V V V
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26 * +--------------+ +--------------+ +--------------+
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27 * | u_entry | | u_entry | | u_entry |
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28 * | ue_next | | ue_next | | ue_next |
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29 * +--------|-----+ +--------|-----+ +--------|-----+
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30 * | | |
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31 * V V V
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32 * +--------------+ NULL NULL
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33 * | u_entry |
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34 * | ue_next |
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35 * +--------|-----+
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36 * |
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37 * V
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38 * etc.
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39 *
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40 * Each u_entry list contains the information for one undo or redo.
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41 * curbuf->b_u_curhead points to the header of the last undo (the next redo),
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758
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42 * or is NULL if nothing has been undone (end of the branch).
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7
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43 *
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753
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44 * For keeping alternate undo/redo branches the uh_alt field is used. Thus at
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45 * each point in the list a branch may appear for an alternate to redo. The
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46 * uh_seq field is numbered sequentially to be able to find a newer or older
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47 * branch.
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48 *
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758
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49 * +---------------+ +---------------+
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50 * b_u_oldhead --->| u_header | | u_header |
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51 * | uh_alt_next ---->| uh_alt_next ----> NULL
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52 * NULL <----- uh_alt_prev |<------ uh_alt_prev |
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53 * | uh_prev | | uh_prev |
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54 * +-----|---------+ +-----|---------+
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55 * | |
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56 * V V
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57 * +---------------+ +---------------+
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58 * | u_header | | u_header |
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59 * | uh_alt_next | | uh_alt_next |
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60 * b_u_newhead --->| uh_alt_prev | | uh_alt_prev |
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61 * | uh_prev | | uh_prev |
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62 * +-----|---------+ +-----|---------+
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63 * | |
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64 * V V
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65 * NULL +---------------+ +---------------+
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66 * | u_header | | u_header |
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67 * | uh_alt_next ---->| uh_alt_next |
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68 * | uh_alt_prev |<------ uh_alt_prev |
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69 * | uh_prev | | uh_prev |
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70 * +-----|---------+ +-----|---------+
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71 * | |
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72 * etc. etc.
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73 *
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74 *
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168
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75 * All data is allocated with U_ALLOC_LINE(), it will be freed as soon as the
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76 * buffer is unloaded.
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7
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77 */
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78
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79 #include "vim.h"
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80
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168
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81 /* See below: use malloc()/free() for memory management. */
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82 #define U_USE_MALLOC 1
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83
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758
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84 static void u_unch_branch __ARGS((u_header_T *uhp));
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7
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85 static u_entry_T *u_get_headentry __ARGS((void));
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86 static void u_getbot __ARGS((void));
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632
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87 static int undo_allowed __ARGS((void));
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7
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88 static int u_savecommon __ARGS((linenr_T, linenr_T, linenr_T));
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89 static void u_doit __ARGS((int count));
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90 static void u_undoredo __ARGS((void));
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91 static void u_undo_end __ARGS((void));
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758
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92 static void u_freeheader __ARGS((buf_T *buf, u_header_T *uhp, u_header_T **uhpp));
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753
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93 static void u_freebranch __ARGS((buf_T *buf, u_header_T *uhp, u_header_T **uhpp));
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94 static void u_freeentries __ARGS((buf_T *buf, u_header_T *uhp, u_header_T **uhpp));
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7
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95 static void u_freeentry __ARGS((u_entry_T *, long));
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96
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168
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97 #ifdef U_USE_MALLOC
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98 # define U_FREE_LINE(ptr) vim_free(ptr)
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99 # define U_ALLOC_LINE(size) lalloc((long_u)((size) + 1), FALSE)
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100 #else
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101 static void u_free_line __ARGS((char_u *ptr, int keep));
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102 static char_u *u_alloc_line __ARGS((unsigned size));
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103 # define U_FREE_LINE(ptr) u_free_line((ptr), FALSE)
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104 # define U_ALLOC_LINE(size) u_alloc_line(size)
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105 #endif
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7
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106 static char_u *u_save_line __ARGS((linenr_T));
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107
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108 static long u_newcount, u_oldcount;
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109
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110 /*
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111 * When 'u' flag included in 'cpoptions', we behave like vi. Need to remember
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112 * the action that "u" should do.
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113 */
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114 static int undo_undoes = FALSE;
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115
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116 /*
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344
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117 * Save the current line for both the "u" and "U" command.
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118 * Returns OK or FAIL.
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7
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119 */
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120 int
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121 u_save_cursor()
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122 {
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123 return (u_save((linenr_T)(curwin->w_cursor.lnum - 1),
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124 (linenr_T)(curwin->w_cursor.lnum + 1)));
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125 }
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126
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127 /*
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128 * Save the lines between "top" and "bot" for both the "u" and "U" command.
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129 * "top" may be 0 and bot may be curbuf->b_ml.ml_line_count + 1.
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130 * Returns FAIL when lines could not be saved, OK otherwise.
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131 */
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132 int
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133 u_save(top, bot)
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134 linenr_T top, bot;
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135 {
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136 if (undo_off)
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137 return OK;
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138
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139 if (top > curbuf->b_ml.ml_line_count ||
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140 top >= bot || bot > curbuf->b_ml.ml_line_count + 1)
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141 return FALSE; /* rely on caller to do error messages */
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142
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143 if (top + 2 == bot)
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144 u_saveline((linenr_T)(top + 1));
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145
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146 return (u_savecommon(top, bot, (linenr_T)0));
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147 }
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148
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149 /*
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150 * save the line "lnum" (used by ":s" and "~" command)
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151 * The line is replaced, so the new bottom line is lnum + 1.
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152 */
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153 int
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154 u_savesub(lnum)
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155 linenr_T lnum;
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156 {
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157 if (undo_off)
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158 return OK;
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159
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160 return (u_savecommon(lnum - 1, lnum + 1, lnum + 1));
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161 }
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162
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163 /*
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164 * a new line is inserted before line "lnum" (used by :s command)
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165 * The line is inserted, so the new bottom line is lnum + 1.
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166 */
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167 int
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168 u_inssub(lnum)
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169 linenr_T lnum;
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170 {
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171 if (undo_off)
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172 return OK;
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173
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174 return (u_savecommon(lnum - 1, lnum, lnum + 1));
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175 }
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176
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177 /*
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178 * save the lines "lnum" - "lnum" + nlines (used by delete command)
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179 * The lines are deleted, so the new bottom line is lnum, unless the buffer
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180 * becomes empty.
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181 */
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182 int
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183 u_savedel(lnum, nlines)
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184 linenr_T lnum;
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185 long nlines;
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186 {
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187 if (undo_off)
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188 return OK;
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189
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190 return (u_savecommon(lnum - 1, lnum + nlines,
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191 nlines == curbuf->b_ml.ml_line_count ? 2 : lnum));
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192 }
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193
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632
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194 /*
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195 * Return TRUE when undo is allowed. Otherwise give an error message and
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196 * return FALSE.
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197 */
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198 static int
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199 undo_allowed()
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200 {
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201 /* Don't allow changes when 'modifiable' is off. */
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202 if (!curbuf->b_p_ma)
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203 {
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204 EMSG(_(e_modifiable));
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205 return FALSE;
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206 }
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207
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208 #ifdef HAVE_SANDBOX
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209 /* In the sandbox it's not allowed to change the text. */
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210 if (sandbox != 0)
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211 {
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212 EMSG(_(e_sandbox));
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213 return FALSE;
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214 }
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215 #endif
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216
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217 /* Don't allow changes in the buffer while editing the cmdline. The
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218 * caller of getcmdline() may get confused. */
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634
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219 if (textlock != 0)
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632
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220 {
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221 EMSG(_(e_secure));
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222 return FALSE;
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223 }
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224
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225 return TRUE;
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226 }
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227
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7
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228 static int
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229 u_savecommon(top, bot, newbot)
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230 linenr_T top, bot;
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231 linenr_T newbot;
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232 {
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753
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233 linenr_T lnum;
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234 long i;
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235 u_header_T *uhp;
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236 u_header_T *old_curhead;
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237 u_entry_T *uep;
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238 u_entry_T *prev_uep;
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239 long size;
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7
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240
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632
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241 /* When making changes is not allowed return FAIL. It's a crude way to
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242 * make all change commands fail. */
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243 if (!undo_allowed())
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7
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244 return FAIL;
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245
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246 #ifdef FEAT_NETBEANS_INTG
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247 /*
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248 * Netbeans defines areas that cannot be modified. Bail out here when
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249 * trying to change text in a guarded area.
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250 */
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33
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251 if (usingNetbeans)
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7
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252 {
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33
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253 if (netbeans_is_guarded(top, bot))
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254 {
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255 EMSG(_(e_guarded));
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256 return FAIL;
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257 }
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258 if (curbuf->b_p_ro)
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259 {
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260 EMSG(_(e_nbreadonly));
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261 return FAIL;
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262 }
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7
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263 }
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264 #endif
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265
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266 #ifdef FEAT_AUTOCMD
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267 /*
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268 * Saving text for undo means we are going to make a change. Give a
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269 * warning for a read-only file before making the change, so that the
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270 * FileChangedRO event can replace the buffer with a read-write version
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271 * (e.g., obtained from a source control system).
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272 */
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273 change_warning(0);
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274 #endif
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275
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276 size = bot - top - 1;
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277
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278 /*
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279 * if curbuf->b_u_synced == TRUE make a new header
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280 */
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281 if (curbuf->b_u_synced)
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282 {
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283 #ifdef FEAT_JUMPLIST
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284 /* Need to create new entry in b_changelist. */
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285 curbuf->b_new_change = TRUE;
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286 #endif
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287
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753
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288 if (p_ul >= 0)
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289 {
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290 /*
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291 * Make a new header entry. Do this first so that we don't mess
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292 * up the undo info when out of memory.
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293 */
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294 uhp = (u_header_T *)U_ALLOC_LINE((unsigned)sizeof(u_header_T));
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295 if (uhp == NULL)
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296 goto nomem;
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297 }
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766
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298 else
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299 uhp = NULL;
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753
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300
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7
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301 /*
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758
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302 * If we undid more than we redid, move the entry lists before and
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303 * including curbuf->b_u_curhead to an alternate branch.
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7
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304 */
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753
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305 old_curhead = curbuf->b_u_curhead;
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306 if (old_curhead != NULL)
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307 {
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308 curbuf->b_u_newhead = old_curhead->uh_next;
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309 curbuf->b_u_curhead = NULL;
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310 }
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7
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311
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312 /*
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313 * free headers to keep the size right
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314 */
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315 while (curbuf->b_u_numhead > p_ul && curbuf->b_u_oldhead != NULL)
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753
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316 {
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758
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317 u_header_T *uhfree = curbuf->b_u_oldhead;
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753
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318
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319 /* If there is no branch only free one header. */
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758
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320 if (uhfree->uh_alt_next == NULL)
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321 u_freeheader(curbuf, uhfree, &old_curhead);
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753
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322 else
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323 {
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324 /* Free the oldest alternate branch as a whole. */
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758
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325 while (uhfree->uh_alt_next != NULL)
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326 uhfree = uhfree->uh_alt_next;
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327 u_freebranch(curbuf, uhfree, &old_curhead);
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753
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328 }
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329 }
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7
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330
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766
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331 if (uhp == NULL) /* no undo at all */
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7
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332 {
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753
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333 if (old_curhead != NULL)
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334 u_freebranch(curbuf, old_curhead, NULL);
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7
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335 curbuf->b_u_synced = FALSE;
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336 return OK;
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337 }
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338
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339 uhp->uh_prev = NULL;
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340 uhp->uh_next = curbuf->b_u_newhead;
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753
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341 uhp->uh_alt_next = old_curhead;
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342 if (old_curhead != NULL)
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343 {
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344 old_curhead->uh_alt_prev = uhp;
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345 if (curbuf->b_u_oldhead == old_curhead)
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346 curbuf->b_u_oldhead = uhp;
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347 }
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348 uhp->uh_alt_prev = NULL;
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758
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349 if (curbuf->b_u_newhead != NULL)
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350 curbuf->b_u_newhead->uh_prev = uhp;
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351
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753
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352 uhp->uh_seq = curbuf->b_u_seq_last++;
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353 curbuf->b_u_seq_cur = curbuf->b_u_seq_last;
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758
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354 uhp->uh_time = time(NULL);
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355 curbuf->b_u_seq_time = uhp->uh_time + 1;
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356
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753
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357 uhp->uh_walk = 0;
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7
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358 uhp->uh_entry = NULL;
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359 uhp->uh_getbot_entry = NULL;
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360 uhp->uh_cursor = curwin->w_cursor; /* save cursor pos. for undo */
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361 #ifdef FEAT_VIRTUALEDIT
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362 if (virtual_active() && curwin->w_cursor.coladd > 0)
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363 uhp->uh_cursor_vcol = getviscol();
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364 else
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365 uhp->uh_cursor_vcol = -1;
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366 #endif
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367
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368 /* save changed and buffer empty flag for undo */
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369 uhp->uh_flags = (curbuf->b_changed ? UH_CHANGED : 0) +
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370 ((curbuf->b_ml.ml_flags & ML_EMPTY) ? UH_EMPTYBUF : 0);
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371
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692
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372 /* save named marks and Visual marks for undo */
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7
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373 mch_memmove(uhp->uh_namedm, curbuf->b_namedm, sizeof(pos_T) * NMARKS);
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692
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374 #ifdef FEAT_VISUAL
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375 uhp->uh_visual = curbuf->b_visual;
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376 #endif
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377
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7
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378 curbuf->b_u_newhead = uhp;
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379 if (curbuf->b_u_oldhead == NULL)
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380 curbuf->b_u_oldhead = uhp;
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381 ++curbuf->b_u_numhead;
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382 }
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383 else
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384 {
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|
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385 if (p_ul < 0) /* no undo at all */
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386 return OK;
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387
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|
|
388 /*
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|
|
389 * When saving a single line, and it has been saved just before, it
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|
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390 * doesn't make sense saving it again. Saves a lot of memory when
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391 * making lots of changes inside the same line.
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392 * This is only possible if the previous change didn't increase or
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393 * decrease the number of lines.
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394 * Check the ten last changes. More doesn't make sense and takes too
|
|
|
395 * long.
|
|
|
396 */
|
|
|
397 if (size == 1)
|
|
|
398 {
|
|
|
399 uep = u_get_headentry();
|
|
|
400 prev_uep = NULL;
|
|
|
401 for (i = 0; i < 10; ++i)
|
|
|
402 {
|
|
|
403 if (uep == NULL)
|
|
|
404 break;
|
|
|
405
|
|
|
406 /* If lines have been inserted/deleted we give up.
|
|
|
407 * Also when the line was included in a multi-line save. */
|
|
|
408 if ((curbuf->b_u_newhead->uh_getbot_entry != uep
|
|
|
409 ? (uep->ue_top + uep->ue_size + 1
|
|
|
410 != (uep->ue_bot == 0
|
|
|
411 ? curbuf->b_ml.ml_line_count + 1
|
|
|
412 : uep->ue_bot))
|
|
|
413 : uep->ue_lcount != curbuf->b_ml.ml_line_count)
|
|
|
414 || (uep->ue_size > 1
|
|
|
415 && top >= uep->ue_top
|
|
|
416 && top + 2 <= uep->ue_top + uep->ue_size + 1))
|
|
|
417 break;
|
|
|
418
|
|
|
419 /* If it's the same line we can skip saving it again. */
|
|
|
420 if (uep->ue_size == 1 && uep->ue_top == top)
|
|
|
421 {
|
|
|
422 if (i > 0)
|
|
|
423 {
|
|
|
424 /* It's not the last entry: get ue_bot for the last
|
|
|
425 * entry now. Following deleted/inserted lines go to
|
|
|
426 * the re-used entry. */
|
|
|
427 u_getbot();
|
|
|
428 curbuf->b_u_synced = FALSE;
|
|
|
429
|
|
|
430 /* Move the found entry to become the last entry. The
|
|
|
431 * order of undo/redo doesn't matter for the entries
|
|
|
432 * we move it over, since they don't change the line
|
|
|
433 * count and don't include this line. It does matter
|
|
|
434 * for the found entry if the line count is changed by
|
|
|
435 * the executed command. */
|
|
|
436 prev_uep->ue_next = uep->ue_next;
|
|
|
437 uep->ue_next = curbuf->b_u_newhead->uh_entry;
|
|
|
438 curbuf->b_u_newhead->uh_entry = uep;
|
|
|
439 }
|
|
|
440
|
|
|
441 /* The executed command may change the line count. */
|
|
|
442 if (newbot != 0)
|
|
|
443 uep->ue_bot = newbot;
|
|
|
444 else if (bot > curbuf->b_ml.ml_line_count)
|
|
|
445 uep->ue_bot = 0;
|
|
|
446 else
|
|
|
447 {
|
|
|
448 uep->ue_lcount = curbuf->b_ml.ml_line_count;
|
|
|
449 curbuf->b_u_newhead->uh_getbot_entry = uep;
|
|
|
450 }
|
|
|
451 return OK;
|
|
|
452 }
|
|
|
453 prev_uep = uep;
|
|
|
454 uep = uep->ue_next;
|
|
|
455 }
|
|
|
456 }
|
|
|
457
|
|
|
458 /* find line number for ue_bot for previous u_save() */
|
|
|
459 u_getbot();
|
|
|
460 }
|
|
|
461
|
|
|
462 #if !defined(UNIX) && !defined(DJGPP) && !defined(WIN32) && !defined(__EMX__)
|
|
|
463 /*
|
|
|
464 * With Amiga and MSDOS 16 bit we can't handle big undo's, because
|
|
|
465 * then u_alloc_line would have to allocate a block larger than 32K
|
|
|
466 */
|
|
|
467 if (size >= 8000)
|
|
|
468 goto nomem;
|
|
|
469 #endif
|
|
|
470
|
|
|
471 /*
|
|
|
472 * add lines in front of entry list
|
|
|
473 */
|
|
168
|
474 uep = (u_entry_T *)U_ALLOC_LINE((unsigned)sizeof(u_entry_T));
|
|
7
|
475 if (uep == NULL)
|
|
|
476 goto nomem;
|
|
|
477
|
|
|
478 uep->ue_size = size;
|
|
|
479 uep->ue_top = top;
|
|
|
480 if (newbot != 0)
|
|
|
481 uep->ue_bot = newbot;
|
|
|
482 /*
|
|
|
483 * Use 0 for ue_bot if bot is below last line.
|
|
|
484 * Otherwise we have to compute ue_bot later.
|
|
|
485 */
|
|
|
486 else if (bot > curbuf->b_ml.ml_line_count)
|
|
|
487 uep->ue_bot = 0;
|
|
|
488 else
|
|
|
489 {
|
|
|
490 uep->ue_lcount = curbuf->b_ml.ml_line_count;
|
|
|
491 curbuf->b_u_newhead->uh_getbot_entry = uep;
|
|
|
492 }
|
|
|
493
|
|
168
|
494 if (size > 0)
|
|
7
|
495 {
|
|
168
|
496 if ((uep->ue_array = (char_u **)U_ALLOC_LINE(
|
|
7
|
497 (unsigned)(sizeof(char_u *) * size))) == NULL)
|
|
|
498 {
|
|
|
499 u_freeentry(uep, 0L);
|
|
|
500 goto nomem;
|
|
|
501 }
|
|
|
502 for (i = 0, lnum = top + 1; i < size; ++i)
|
|
|
503 {
|
|
481
|
504 fast_breakcheck();
|
|
|
505 if (got_int)
|
|
|
506 {
|
|
|
507 u_freeentry(uep, i);
|
|
|
508 return FAIL;
|
|
|
509 }
|
|
7
|
510 if ((uep->ue_array[i] = u_save_line(lnum++)) == NULL)
|
|
|
511 {
|
|
|
512 u_freeentry(uep, i);
|
|
|
513 goto nomem;
|
|
|
514 }
|
|
|
515 }
|
|
|
516 }
|
|
359
|
517 else
|
|
|
518 uep->ue_array = NULL;
|
|
7
|
519 uep->ue_next = curbuf->b_u_newhead->uh_entry;
|
|
|
520 curbuf->b_u_newhead->uh_entry = uep;
|
|
|
521 curbuf->b_u_synced = FALSE;
|
|
|
522 undo_undoes = FALSE;
|
|
|
523
|
|
|
524 return OK;
|
|
|
525
|
|
|
526 nomem:
|
|
|
527 msg_silent = 0; /* must display the prompt */
|
|
|
528 if (ask_yesno((char_u *)_("No undo possible; continue anyway"), TRUE)
|
|
|
529 == 'y')
|
|
|
530 {
|
|
|
531 undo_off = TRUE; /* will be reset when character typed */
|
|
|
532 return OK;
|
|
|
533 }
|
|
|
534 do_outofmem_msg((long_u)0);
|
|
|
535 return FAIL;
|
|
|
536 }
|
|
|
537
|
|
|
538 /*
|
|
|
539 * If 'cpoptions' contains 'u': Undo the previous undo or redo (vi compatible).
|
|
|
540 * If 'cpoptions' does not contain 'u': Always undo.
|
|
|
541 */
|
|
|
542 void
|
|
|
543 u_undo(count)
|
|
|
544 int count;
|
|
|
545 {
|
|
|
546 /*
|
|
|
547 * If we get an undo command while executing a macro, we behave like the
|
|
|
548 * original vi. If this happens twice in one macro the result will not
|
|
|
549 * be compatible.
|
|
|
550 */
|
|
|
551 if (curbuf->b_u_synced == FALSE)
|
|
|
552 {
|
|
|
553 u_sync();
|
|
|
554 count = 1;
|
|
|
555 }
|
|
|
556
|
|
|
557 if (vim_strchr(p_cpo, CPO_UNDO) == NULL)
|
|
|
558 undo_undoes = TRUE;
|
|
|
559 else
|
|
|
560 undo_undoes = !undo_undoes;
|
|
|
561 u_doit(count);
|
|
|
562 }
|
|
|
563
|
|
|
564 /*
|
|
|
565 * If 'cpoptions' contains 'u': Repeat the previous undo or redo.
|
|
|
566 * If 'cpoptions' does not contain 'u': Always redo.
|
|
|
567 */
|
|
|
568 void
|
|
|
569 u_redo(count)
|
|
|
570 int count;
|
|
|
571 {
|
|
|
572 if (vim_strchr(p_cpo, CPO_UNDO) == NULL)
|
|
|
573 undo_undoes = FALSE;
|
|
|
574 u_doit(count);
|
|
|
575 }
|
|
|
576
|
|
|
577 /*
|
|
|
578 * Undo or redo, depending on 'undo_undoes', 'count' times.
|
|
|
579 */
|
|
|
580 static void
|
|
|
581 u_doit(count)
|
|
|
582 int count;
|
|
|
583 {
|
|
632
|
584 if (!undo_allowed())
|
|
7
|
585 return;
|
|
|
586
|
|
|
587 u_newcount = 0;
|
|
|
588 u_oldcount = 0;
|
|
179
|
589 if (curbuf->b_ml.ml_flags & ML_EMPTY)
|
|
|
590 u_oldcount = -1;
|
|
7
|
591 while (count--)
|
|
|
592 {
|
|
|
593 if (undo_undoes)
|
|
|
594 {
|
|
|
595 if (curbuf->b_u_curhead == NULL) /* first undo */
|
|
|
596 curbuf->b_u_curhead = curbuf->b_u_newhead;
|
|
|
597 else if (p_ul > 0) /* multi level undo */
|
|
|
598 /* get next undo */
|
|
|
599 curbuf->b_u_curhead = curbuf->b_u_curhead->uh_next;
|
|
|
600 /* nothing to undo */
|
|
|
601 if (curbuf->b_u_numhead == 0 || curbuf->b_u_curhead == NULL)
|
|
|
602 {
|
|
|
603 /* stick curbuf->b_u_curhead at end */
|
|
|
604 curbuf->b_u_curhead = curbuf->b_u_oldhead;
|
|
|
605 beep_flush();
|
|
|
606 break;
|
|
|
607 }
|
|
|
608
|
|
|
609 u_undoredo();
|
|
|
610 }
|
|
|
611 else
|
|
|
612 {
|
|
|
613 if (curbuf->b_u_curhead == NULL || p_ul <= 0)
|
|
|
614 {
|
|
|
615 beep_flush(); /* nothing to redo */
|
|
|
616 break;
|
|
|
617 }
|
|
|
618
|
|
|
619 u_undoredo();
|
|
758
|
620 ++curbuf->b_u_seq_cur;
|
|
|
621 ++curbuf->b_u_seq_time;
|
|
753
|
622
|
|
|
623 /* Advance for next redo. Set "newhead" when at the end of the
|
|
|
624 * redoable changes. */
|
|
|
625 if (curbuf->b_u_curhead->uh_prev == NULL)
|
|
|
626 curbuf->b_u_newhead = curbuf->b_u_curhead;
|
|
7
|
627 curbuf->b_u_curhead = curbuf->b_u_curhead->uh_prev;
|
|
|
628 }
|
|
|
629 }
|
|
753
|
630 u_undo_end();
|
|
|
631 }
|
|
|
632
|
|
|
633 static int lastmark = 0;
|
|
|
634
|
|
|
635 /*
|
|
|
636 * Undo or redo over the timeline.
|
|
|
637 * When "step" is negative go back in time, otherwise goes forward in time.
|
|
758
|
638 * When "sec" is FALSE make "step" steps, when "sec" is TRUE use "step" as
|
|
|
639 * seconds.
|
|
753
|
640 */
|
|
|
641 void
|
|
758
|
642 undo_time(step, sec)
|
|
|
643 long step;
|
|
|
644 int sec;
|
|
753
|
645 {
|
|
|
646 long target;
|
|
|
647 long closest;
|
|
758
|
648 long closest_start;
|
|
|
649 long closest_seq = 0;
|
|
|
650 long val;
|
|
|
651 long limit;
|
|
753
|
652 u_header_T *uhp;
|
|
|
653 u_header_T *last;
|
|
|
654 int mark;
|
|
|
655 int nomark;
|
|
|
656 int round;
|
|
758
|
657 int dosec = sec;
|
|
|
658 int above = FALSE;
|
|
753
|
659
|
|
766
|
660 /* First make sure the current undoable change is synced. */
|
|
|
661 if (curbuf->b_u_synced == FALSE)
|
|
|
662 u_sync();
|
|
|
663
|
|
753
|
664 u_newcount = 0;
|
|
|
665 u_oldcount = 0;
|
|
179
|
666 if (curbuf->b_ml.ml_flags & ML_EMPTY)
|
|
753
|
667 u_oldcount = -1;
|
|
|
668
|
|
|
669 /* "target" is the node below which we want to be. When going forward
|
|
|
670 * the current one also counts, thus do one less. */
|
|
|
671 if (step < 0)
|
|
|
672 {
|
|
758
|
673 if (sec)
|
|
|
674 target = (long)curbuf->b_u_seq_time + step;
|
|
|
675 else
|
|
|
676 target = curbuf->b_u_seq_cur + step;
|
|
|
677 if (target < 0)
|
|
|
678 target = -1;
|
|
|
679 closest = -2;
|
|
753
|
680 }
|
|
|
681 else
|
|
|
682 {
|
|
758
|
683 if (sec)
|
|
|
684 {
|
|
|
685 target = curbuf->b_u_seq_time + step - 1;
|
|
|
686 closest = time(NULL) + 1;
|
|
|
687 }
|
|
|
688 else
|
|
|
689 {
|
|
|
690 target = curbuf->b_u_seq_cur + step - 1;
|
|
|
691 closest = curbuf->b_u_seq_last + 1;
|
|
|
692 }
|
|
|
693 if (target >= closest)
|
|
|
694 target = closest - 1;
|
|
753
|
695 }
|
|
758
|
696 closest_start = closest;
|
|
|
697 if (sec)
|
|
|
698 limit = curbuf->b_u_seq_time + (step > 0 ? -1 : 1);
|
|
|
699 else
|
|
|
700 limit = curbuf->b_u_seq_cur;
|
|
753
|
701
|
|
758
|
702 /*
|
|
|
703 * May do this twice:
|
|
753
|
704 * 1. Search for "target", update "closest" to the best match found.
|
|
758
|
705 * 2. If "target" not found search for "closest".
|
|
|
706 *
|
|
|
707 * When using the closest time we use the sequence number in the second
|
|
|
708 * round, because there may be several entries with the same time.
|
|
|
709 */
|
|
753
|
710 for (round = 1; round <= 2; ++round)
|
|
|
711 {
|
|
|
712 /* Find the path from the current state to where we want to go. The
|
|
|
713 * desired state can be anywhere in the undo tree, need to go all over
|
|
|
714 * it. We put "nomark" in uh_walk where we have been without success,
|
|
|
715 * "mark" where it could possibly be. */
|
|
|
716 mark = ++lastmark;
|
|
|
717 nomark = ++lastmark;
|
|
|
718
|
|
|
719 if (curbuf->b_u_curhead == NULL) /* at leaf of the tree */
|
|
|
720 uhp = curbuf->b_u_newhead;
|
|
|
721 else
|
|
|
722 uhp = curbuf->b_u_curhead;
|
|
|
723
|
|
|
724 while (uhp != NULL)
|
|
|
725 {
|
|
|
726 uhp->uh_walk = mark;
|
|
758
|
727 val = (dosec ? uhp->uh_time : uhp->uh_seq);
|
|
753
|
728
|
|
758
|
729 if (round == 1)
|
|
|
730 {
|
|
|
731 /* Remember the header that is closest to the target.
|
|
|
732 * It must be at least in the right direction (checked with
|
|
|
733 * "limit"). When the timestamp is equal find the
|
|
|
734 * highest/lowest sequence number. */
|
|
|
735 if ((dosec && val == closest)
|
|
|
736 ? (step < 0
|
|
|
737 ? uhp->uh_seq < closest_seq
|
|
|
738 : uhp->uh_seq > closest_seq)
|
|
|
739 : (step < 0
|
|
|
740 ? (val < limit
|
|
|
741 && (closest > target
|
|
|
742 ? (val <= closest)
|
|
|
743 : (val >= closest)))
|
|
|
744 : (val > limit
|
|
|
745 && (closest < target
|
|
|
746 ? val >= closest
|
|
|
747 : val <= closest))))
|
|
|
748 {
|
|
|
749 closest = val;
|
|
|
750 closest_seq = uhp->uh_seq;
|
|
|
751 }
|
|
|
752 }
|
|
|
753
|
|
|
754 /* Quit searching when we found a match. But when searching for a
|
|
|
755 * time we need to continue looking for the best uh_seq. */
|
|
|
756 if (target == val && !dosec)
|
|
|
757 break;
|
|
753
|
758
|
|
|
759 /* go down in the tree if we haven't been there */
|
|
|
760 if (uhp->uh_prev != NULL && uhp->uh_prev->uh_walk != nomark
|
|
|
761 && uhp->uh_prev->uh_walk != mark)
|
|
|
762 uhp = uhp->uh_prev;
|
|
|
763
|
|
|
764 /* go to alternate branch if we haven't been there */
|
|
|
765 else if (uhp->uh_alt_next != NULL
|
|
|
766 && uhp->uh_alt_next->uh_walk != nomark
|
|
|
767 && uhp->uh_alt_next->uh_walk != mark)
|
|
|
768 uhp = uhp->uh_alt_next;
|
|
|
769
|
|
|
770 /* go up in the tree if we haven't been there and we are at the
|
|
|
771 * start of alternate branches */
|
|
|
772 else if (uhp->uh_next != NULL && uhp->uh_alt_prev == NULL
|
|
|
773 && uhp->uh_next->uh_walk != nomark
|
|
|
774 && uhp->uh_next->uh_walk != mark)
|
|
|
775 uhp = uhp->uh_next;
|
|
|
776
|
|
|
777 else
|
|
|
778 {
|
|
|
779 /* need to backtrack; mark this node as useless */
|
|
|
780 uhp->uh_walk = nomark;
|
|
|
781 if (uhp->uh_alt_prev != NULL)
|
|
|
782 uhp = uhp->uh_alt_prev;
|
|
|
783 else
|
|
|
784 uhp = uhp->uh_next;
|
|
|
785 }
|
|
|
786 }
|
|
|
787
|
|
|
788 if (uhp != NULL) /* found it */
|
|
|
789 break;
|
|
758
|
790 if (closest == closest_start)
|
|
753
|
791 {
|
|
758
|
792 if (step < 0)
|
|
|
793 MSG(_("Already at oldest change"));
|
|
|
794 else
|
|
|
795 MSG(_("Already at newest change"));
|
|
753
|
796 return;
|
|
|
797 }
|
|
|
798
|
|
758
|
799 target = closest_seq;
|
|
|
800 dosec = FALSE;
|
|
|
801 if (step < 0)
|
|
|
802 above = TRUE; /* stop above the header */
|
|
753
|
803 }
|
|
|
804
|
|
|
805 /* If we found it: Follow the path to go to where we want to be. */
|
|
|
806 if (uhp != NULL)
|
|
|
807 {
|
|
|
808 /*
|
|
|
809 * First go up the tree as much as needed.
|
|
|
810 */
|
|
|
811 for (;;)
|
|
|
812 {
|
|
|
813 uhp = curbuf->b_u_curhead;
|
|
|
814 if (uhp == NULL)
|
|
|
815 uhp = curbuf->b_u_newhead;
|
|
|
816 else
|
|
|
817 {
|
|
758
|
818 while (uhp->uh_alt_prev != NULL
|
|
|
819 && uhp->uh_alt_prev->uh_walk == mark)
|
|
753
|
820 {
|
|
|
821 uhp->uh_walk = nomark;
|
|
|
822 uhp = uhp->uh_alt_prev;
|
|
|
823 }
|
|
|
824 uhp = uhp->uh_next;
|
|
|
825 }
|
|
|
826 if (uhp == NULL || uhp->uh_walk != mark)
|
|
|
827 break;
|
|
|
828 curbuf->b_u_curhead = uhp;
|
|
|
829 u_undoredo();
|
|
|
830 uhp->uh_walk = nomark; /* don't go back down here */
|
|
|
831 }
|
|
|
832
|
|
|
833 /*
|
|
758
|
834 * And now go down the tree (redo), branching off where needed.
|
|
753
|
835 */
|
|
|
836 uhp = curbuf->b_u_curhead;
|
|
|
837 for (;;)
|
|
|
838 {
|
|
|
839 /* Find the last branch with a mark, that's the one. */
|
|
|
840 last = uhp;
|
|
|
841 while (last->uh_alt_next != NULL
|
|
|
842 && last->uh_alt_next->uh_walk == mark)
|
|
|
843 last = last->uh_alt_next;
|
|
|
844 if (last != uhp)
|
|
|
845 {
|
|
|
846 /* Make the used branch the first entry in the list of
|
|
|
847 * alternatives to make "u" and CTRL-R take this branch. */
|
|
|
848 if (last->uh_alt_next != NULL)
|
|
|
849 last->uh_alt_next->uh_alt_prev = last->uh_alt_prev;
|
|
|
850 last->uh_alt_prev->uh_alt_next = last->uh_alt_next;
|
|
|
851 last->uh_alt_prev = NULL;
|
|
|
852 last->uh_alt_next = uhp;
|
|
|
853 uhp->uh_alt_prev = last;
|
|
|
854
|
|
|
855 uhp = last;
|
|
|
856 }
|
|
758
|
857 curbuf->b_u_curhead = uhp;
|
|
|
858 curbuf->b_u_seq_cur = uhp->uh_seq;
|
|
|
859 curbuf->b_u_seq_time = uhp->uh_time;
|
|
753
|
860
|
|
|
861 if (uhp->uh_walk != mark)
|
|
|
862 break; /* must have reached the target */
|
|
|
863
|
|
758
|
864 /* Stop when going backwards in time and didn't find the exact
|
|
|
865 * header we were looking for. */
|
|
|
866 if (uhp->uh_seq == target && above)
|
|
|
867 break;
|
|
|
868
|
|
753
|
869 u_undoredo();
|
|
758
|
870 ++curbuf->b_u_seq_cur;
|
|
|
871 ++curbuf->b_u_seq_time;
|
|
753
|
872
|
|
|
873 /* Advance "curhead" to below the header we last used. If it
|
|
|
874 * becomes NULL then we need to set "newhead" to this leaf. */
|
|
|
875 if (uhp->uh_prev == NULL)
|
|
|
876 curbuf->b_u_newhead = uhp;
|
|
|
877 curbuf->b_u_curhead = uhp->uh_prev;
|
|
|
878
|
|
|
879 if (uhp->uh_seq == target) /* found it! */
|
|
|
880 break;
|
|
|
881
|
|
|
882 uhp = uhp->uh_prev;
|
|
|
883 if (uhp == NULL || uhp->uh_walk != mark)
|
|
|
884 {
|
|
|
885 EMSG2(_(e_intern2), "undo_time()");
|
|
|
886 break;
|
|
|
887 }
|
|
|
888 }
|
|
|
889 }
|
|
7
|
890 u_undo_end();
|
|
|
891 }
|
|
|
892
|
|
|
893 /*
|
|
|
894 * u_undoredo: common code for undo and redo
|
|
|
895 *
|
|
|
896 * The lines in the file are replaced by the lines in the entry list at
|
|
|
897 * curbuf->b_u_curhead. The replaced lines in the file are saved in the entry
|
|
|
898 * list for the next undo/redo.
|
|
|
899 */
|
|
|
900 static void
|
|
|
901 u_undoredo()
|
|
|
902 {
|
|
|
903 char_u **newarray = NULL;
|
|
|
904 linenr_T oldsize;
|
|
|
905 linenr_T newsize;
|
|
|
906 linenr_T top, bot;
|
|
|
907 linenr_T lnum;
|
|
|
908 linenr_T newlnum = MAXLNUM;
|
|
|
909 long i;
|
|
|
910 u_entry_T *uep, *nuep;
|
|
|
911 u_entry_T *newlist = NULL;
|
|
|
912 int old_flags;
|
|
|
913 int new_flags;
|
|
|
914 pos_T namedm[NMARKS];
|
|
692
|
915 #ifdef FEAT_VISUAL
|
|
|
916 visualinfo_T visualinfo;
|
|
|
917 #endif
|
|
7
|
918 int empty_buffer; /* buffer became empty */
|
|
758
|
919 u_header_T *curhead = curbuf->b_u_curhead;
|
|
7
|
920
|
|
758
|
921 old_flags = curhead->uh_flags;
|
|
7
|
922 new_flags = (curbuf->b_changed ? UH_CHANGED : 0) +
|
|
|
923 ((curbuf->b_ml.ml_flags & ML_EMPTY) ? UH_EMPTYBUF : 0);
|
|
|
924 setpcmark();
|
|
|
925
|
|
|
926 /*
|
|
|
927 * save marks before undo/redo
|
|
|
928 */
|
|
|
929 mch_memmove(namedm, curbuf->b_namedm, sizeof(pos_T) * NMARKS);
|
|
692
|
930 #ifdef FEAT_VISUAL
|
|
|
931 visualinfo = curbuf->b_visual;
|
|
|
932 #endif
|
|
7
|
933 curbuf->b_op_start.lnum = curbuf->b_ml.ml_line_count;
|
|
|
934 curbuf->b_op_start.col = 0;
|
|
|
935 curbuf->b_op_end.lnum = 0;
|
|
|
936 curbuf->b_op_end.col = 0;
|
|
|
937
|
|
758
|
938 for (uep = curhead->uh_entry; uep != NULL; uep = nuep)
|
|
7
|
939 {
|
|
|
940 top = uep->ue_top;
|
|
|
941 bot = uep->ue_bot;
|
|
|
942 if (bot == 0)
|
|
|
943 bot = curbuf->b_ml.ml_line_count + 1;
|
|
|
944 if (top > curbuf->b_ml.ml_line_count || top >= bot
|
|
|
945 || bot > curbuf->b_ml.ml_line_count + 1)
|
|
|
946 {
|
|
|
947 EMSG(_("E438: u_undo: line numbers wrong"));
|
|
|
948 changed(); /* don't want UNCHANGED now */
|
|
|
949 return;
|
|
|
950 }
|
|
|
951
|
|
|
952 oldsize = bot - top - 1; /* number of lines before undo */
|
|
|
953 newsize = uep->ue_size; /* number of lines after undo */
|
|
|
954
|
|
|
955 if (top < newlnum)
|
|
|
956 {
|
|
|
957 /* If the saved cursor is somewhere in this undo block, move it to
|
|
|
958 * the remembered position. Makes "gwap" put the cursor back
|
|
|
959 * where it was. */
|
|
758
|
960 lnum = curhead->uh_cursor.lnum;
|
|
7
|
961 if (lnum >= top && lnum <= top + newsize + 1)
|
|
|
962 {
|
|
758
|
963 curwin->w_cursor = curhead->uh_cursor;
|
|
7
|
964 newlnum = curwin->w_cursor.lnum - 1;
|
|
|
965 }
|
|
|
966 else
|
|
|
967 {
|
|
|
968 /* Use the first line that actually changed. Avoids that
|
|
|
969 * undoing auto-formatting puts the cursor in the previous
|
|
|
970 * line. */
|
|
|
971 for (i = 0; i < newsize && i < oldsize; ++i)
|
|
|
972 if (STRCMP(uep->ue_array[i], ml_get(top + 1 + i)) != 0)
|
|
|
973 break;
|
|
|
974 if (i == newsize && newlnum == MAXLNUM && uep->ue_next == NULL)
|
|
|
975 {
|
|
|
976 newlnum = top;
|
|
|
977 curwin->w_cursor.lnum = newlnum + 1;
|
|
|
978 }
|
|
|
979 else if (i < newsize)
|
|
|
980 {
|
|
|
981 newlnum = top + i;
|
|
|
982 curwin->w_cursor.lnum = newlnum + 1;
|
|
|
983 }
|
|
|
984 }
|
|
|
985 }
|
|
|
986
|
|
|
987 empty_buffer = FALSE;
|
|
|
988
|
|
|
989 /* delete the lines between top and bot and save them in newarray */
|
|
168
|
990 if (oldsize > 0)
|
|
7
|
991 {
|
|
168
|
992 if ((newarray = (char_u **)U_ALLOC_LINE(
|
|
7
|
993 (unsigned)(sizeof(char_u *) * oldsize))) == NULL)
|
|
|
994 {
|
|
|
995 do_outofmem_msg((long_u)(sizeof(char_u *) * oldsize));
|
|
|
996 /*
|
|
|
997 * We have messed up the entry list, repair is impossible.
|
|
|
998 * we have to free the rest of the list.
|
|
|
999 */
|
|
|
1000 while (uep != NULL)
|
|
|
1001 {
|
|
|
1002 nuep = uep->ue_next;
|
|
|
1003 u_freeentry(uep, uep->ue_size);
|
|
|
1004 uep = nuep;
|
|
|
1005 }
|
|
|
1006 break;
|
|
|
1007 }
|
|
|
1008 /* delete backwards, it goes faster in most cases */
|
|
|
1009 for (lnum = bot - 1, i = oldsize; --i >= 0; --lnum)
|
|
|
1010 {
|
|
|
1011 /* what can we do when we run out of memory? */
|
|
|
1012 if ((newarray[i] = u_save_line(lnum)) == NULL)
|
|
|
1013 do_outofmem_msg((long_u)0);
|
|
|
1014 /* remember we deleted the last line in the buffer, and a
|
|
|
1015 * dummy empty line will be inserted */
|
|
|
1016 if (curbuf->b_ml.ml_line_count == 1)
|
|
|
1017 empty_buffer = TRUE;
|
|
|
1018 ml_delete(lnum, FALSE);
|
|
|
1019 }
|
|
|
1020 }
|
|
414
|
1021 else
|
|
|
1022 newarray = NULL;
|
|
7
|
1023
|
|
|
1024 /* insert the lines in u_array between top and bot */
|
|
|
1025 if (newsize)
|
|
|
1026 {
|
|
|
1027 for (lnum = top, i = 0; i < newsize; ++i, ++lnum)
|
|
|
1028 {
|
|
|
1029 /*
|
|
|
1030 * If the file is empty, there is an empty line 1 that we
|
|
|
1031 * should get rid of, by replacing it with the new line
|
|
|
1032 */
|
|
|
1033 if (empty_buffer && lnum == 0)
|
|
|
1034 ml_replace((linenr_T)1, uep->ue_array[i], TRUE);
|
|
|
1035 else
|
|
|
1036 ml_append(lnum, uep->ue_array[i], (colnr_T)0, FALSE);
|
|
168
|
1037 U_FREE_LINE(uep->ue_array[i]);
|
|
7
|
1038 }
|
|
168
|
1039 U_FREE_LINE((char_u *)uep->ue_array);
|
|
7
|
1040 }
|
|
|
1041
|
|
|
1042 /* adjust marks */
|
|
|
1043 if (oldsize != newsize)
|
|
|
1044 {
|
|
|
1045 mark_adjust(top + 1, top + oldsize, (long)MAXLNUM,
|
|
|
1046 (long)newsize - (long)oldsize);
|
|
|
1047 if (curbuf->b_op_start.lnum > top + oldsize)
|
|
|
1048 curbuf->b_op_start.lnum += newsize - oldsize;
|
|
|
1049 if (curbuf->b_op_end.lnum > top + oldsize)
|
|
|
1050 curbuf->b_op_end.lnum += newsize - oldsize;
|
|
|
1051 }
|
|
|
1052
|
|
|
1053 changed_lines(top + 1, 0, bot, newsize - oldsize);
|
|
|
1054
|
|
|
1055 /* set '[ and '] mark */
|
|
|
1056 if (top + 1 < curbuf->b_op_start.lnum)
|
|
|
1057 curbuf->b_op_start.lnum = top + 1;
|
|
|
1058 if (newsize == 0 && top + 1 > curbuf->b_op_end.lnum)
|
|
|
1059 curbuf->b_op_end.lnum = top + 1;
|
|
|
1060 else if (top + newsize > curbuf->b_op_end.lnum)
|
|
|
1061 curbuf->b_op_end.lnum = top + newsize;
|
|
|
1062
|
|
|
1063 u_newcount += newsize;
|
|
|
1064 u_oldcount += oldsize;
|
|
|
1065 uep->ue_size = oldsize;
|
|
|
1066 uep->ue_array = newarray;
|
|
|
1067 uep->ue_bot = top + newsize + 1;
|
|
|
1068
|
|
|
1069 /*
|
|
|
1070 * insert this entry in front of the new entry list
|
|
|
1071 */
|
|
|
1072 nuep = uep->ue_next;
|
|
|
1073 uep->ue_next = newlist;
|
|
|
1074 newlist = uep;
|
|
|
1075 }
|
|
|
1076
|
|
758
|
1077 curhead->uh_entry = newlist;
|
|
|
1078 curhead->uh_flags = new_flags;
|
|
7
|
1079 if ((old_flags & UH_EMPTYBUF) && bufempty())
|
|
|
1080 curbuf->b_ml.ml_flags |= ML_EMPTY;
|
|
|
1081 if (old_flags & UH_CHANGED)
|
|
|
1082 changed();
|
|
|
1083 else
|
|
33
|
1084 #ifdef FEAT_NETBEANS_INTG
|
|
|
1085 /* per netbeans undo rules, keep it as modified */
|
|
|
1086 if (!isNetbeansModified(curbuf))
|
|
|
1087 #endif
|
|
7
|
1088 unchanged(curbuf, FALSE);
|
|
|
1089
|
|
|
1090 /*
|
|
|
1091 * restore marks from before undo/redo
|
|
|
1092 */
|
|
|
1093 for (i = 0; i < NMARKS; ++i)
|
|
758
|
1094 if (curhead->uh_namedm[i].lnum != 0)
|
|
7
|
1095 {
|
|
758
|
1096 curbuf->b_namedm[i] = curhead->uh_namedm[i];
|
|
|
1097 curhead->uh_namedm[i] = namedm[i];
|
|
7
|
1098 }
|
|
692
|
1099 #ifdef FEAT_VISUAL
|
|
758
|
1100 if (curhead->uh_visual.vi_start.lnum != 0)
|
|
692
|
1101 {
|
|
758
|
1102 curbuf->b_visual = curhead->uh_visual;
|
|
|
1103 curhead->uh_visual = visualinfo;
|
|
692
|
1104 }
|
|
|
1105 #endif
|
|
7
|
1106
|
|
|
1107 /*
|
|
|
1108 * If the cursor is only off by one line, put it at the same position as
|
|
|
1109 * before starting the change (for the "o" command).
|
|
|
1110 * Otherwise the cursor should go to the first undone line.
|
|
|
1111 */
|
|
758
|
1112 if (curhead->uh_cursor.lnum + 1 == curwin->w_cursor.lnum
|
|
7
|
1113 && curwin->w_cursor.lnum > 1)
|
|
|
1114 --curwin->w_cursor.lnum;
|
|
758
|
1115 if (curhead->uh_cursor.lnum == curwin->w_cursor.lnum)
|
|
7
|
1116 {
|
|
758
|
1117 curwin->w_cursor.col = curhead->uh_cursor.col;
|
|
7
|
1118 #ifdef FEAT_VIRTUALEDIT
|
|
758
|
1119 if (virtual_active() && curhead->uh_cursor_vcol >= 0)
|
|
|
1120 coladvance((colnr_T)curhead->uh_cursor_vcol);
|
|
7
|
1121 else
|
|
|
1122 curwin->w_cursor.coladd = 0;
|
|
|
1123 #endif
|
|
|
1124 }
|
|
|
1125 else if (curwin->w_cursor.lnum <= curbuf->b_ml.ml_line_count)
|
|
|
1126 beginline(BL_SOL | BL_FIX);
|
|
|
1127 else
|
|
|
1128 {
|
|
|
1129 /* We get here with the current cursor line being past the end (eg
|
|
|
1130 * after adding lines at the end of the file, and then undoing it).
|
|
|
1131 * check_cursor() will move the cursor to the last line. Move it to
|
|
|
1132 * the first column here. */
|
|
|
1133 curwin->w_cursor.col = 0;
|
|
|
1134 #ifdef FEAT_VIRTUALEDIT
|
|
|
1135 curwin->w_cursor.coladd = 0;
|
|
|
1136 #endif
|
|
|
1137 }
|
|
|
1138
|
|
|
1139 /* Make sure the cursor is on an existing line and column. */
|
|
|
1140 check_cursor();
|
|
758
|
1141
|
|
|
1142 /* Remember where we are for "g-" and ":earlier 10s". */
|
|
|
1143 curbuf->b_u_seq_cur = curhead->uh_seq;
|
|
|
1144 curbuf->b_u_seq_time = curhead->uh_time;
|
|
7
|
1145 }
|
|
|
1146
|
|
|
1147 /*
|
|
|
1148 * If we deleted or added lines, report the number of less/more lines.
|
|
|
1149 * Otherwise, report the number of changes (this may be incorrect
|
|
|
1150 * in some cases, but it's better than nothing).
|
|
|
1151 */
|
|
|
1152 static void
|
|
|
1153 u_undo_end()
|
|
|
1154 {
|
|
753
|
1155 long sec;
|
|
|
1156 char *msg;
|
|
|
1157
|
|
7
|
1158 #ifdef FEAT_FOLDING
|
|
|
1159 if ((fdo_flags & FDO_UNDO) && KeyTyped)
|
|
|
1160 foldOpenCursor();
|
|
|
1161 #endif
|
|
753
|
1162
|
|
|
1163 if (global_busy /* no messages now, wait until global is finished */
|
|
|
1164 || !messaging()) /* 'lazyredraw' set, don't do messages now */
|
|
|
1165 return;
|
|
|
1166
|
|
|
1167 if (curbuf->b_ml.ml_flags & ML_EMPTY)
|
|
|
1168 --u_newcount;
|
|
|
1169
|
|
|
1170 u_oldcount -= u_newcount;
|
|
|
1171 if (u_oldcount == -1)
|
|
|
1172 msg = N_("more line");
|
|
|
1173 else if (u_oldcount < 0)
|
|
|
1174 msg = N_("more lines");
|
|
|
1175 else if (u_oldcount == 1)
|
|
|
1176 msg = N_("line less");
|
|
|
1177 else if (u_oldcount > 1)
|
|
|
1178 msg = N_("fewer lines");
|
|
|
1179 else
|
|
|
1180 {
|
|
|
1181 u_oldcount = u_newcount;
|
|
|
1182 if (u_newcount == 1)
|
|
|
1183 msg = N_("change");
|
|
|
1184 else
|
|
|
1185 msg = N_("changes");
|
|
|
1186 }
|
|
|
1187
|
|
|
1188 if (curbuf->b_u_curhead == 0)
|
|
|
1189 sec = 0;
|
|
|
1190 else
|
|
|
1191 sec = time(NULL) - curbuf->b_u_curhead->uh_time;
|
|
|
1192
|
|
|
1193 smsg((char_u *)_("%ld %s; %ld seconds ago"), u_oldcount, _(msg), sec);
|
|
7
|
1194 }
|
|
|
1195
|
|
|
1196 /*
|
|
|
1197 * u_sync: stop adding to the current entry list
|
|
|
1198 */
|
|
|
1199 void
|
|
|
1200 u_sync()
|
|
|
1201 {
|
|
|
1202 if (curbuf->b_u_synced)
|
|
|
1203 return; /* already synced */
|
|
|
1204 #if defined(FEAT_XIM) && defined(FEAT_GUI_GTK)
|
|
|
1205 if (im_is_preediting())
|
|
|
1206 return; /* XIM is busy, don't break an undo sequence */
|
|
|
1207 #endif
|
|
|
1208 if (p_ul < 0)
|
|
|
1209 curbuf->b_u_synced = TRUE; /* no entries, nothing to do */
|
|
|
1210 else
|
|
|
1211 {
|
|
|
1212 u_getbot(); /* compute ue_bot of previous u_save */
|
|
|
1213 curbuf->b_u_curhead = NULL;
|
|
|
1214 }
|
|
|
1215 }
|
|
|
1216
|
|
|
1217 /*
|
|
697
|
1218 * ":undojoin": continue adding to the last entry list
|
|
|
1219 */
|
|
|
1220 /*ARGSUSED*/
|
|
|
1221 void
|
|
|
1222 ex_undojoin(eap)
|
|
|
1223 exarg_T *eap;
|
|
|
1224 {
|
|
|
1225 if (!curbuf->b_u_synced)
|
|
|
1226 return; /* already unsynced */
|
|
|
1227 if (curbuf->b_u_newhead == NULL)
|
|
|
1228 return; /* nothing changed before */
|
|
|
1229 if (p_ul < 0)
|
|
|
1230 return; /* no entries, nothing to do */
|
|
|
1231 else
|
|
|
1232 {
|
|
|
1233 /* Go back to the last entry */
|
|
|
1234 curbuf->b_u_curhead = curbuf->b_u_newhead;
|
|
|
1235 curbuf->b_u_synced = FALSE; /* no entries, nothing to do */
|
|
|
1236 }
|
|
|
1237 }
|
|
|
1238
|
|
|
1239 /*
|
|
7
|
1240 * Called after writing the file and setting b_changed to FALSE.
|
|
|
1241 * Now an undo means that the buffer is modified.
|
|
|
1242 */
|
|
|
1243 void
|
|
|
1244 u_unchanged(buf)
|
|
|
1245 buf_T *buf;
|
|
|
1246 {
|
|
758
|
1247 u_unch_branch(buf->b_u_oldhead);
|
|
|
1248 buf->b_did_warn = FALSE;
|
|
|
1249 }
|
|
|
1250
|
|
|
1251 static void
|
|
|
1252 u_unch_branch(uhp)
|
|
|
1253 u_header_T *uhp;
|
|
|
1254 {
|
|
753
|
1255 u_header_T *uh;
|
|
7
|
1256
|
|
758
|
1257 for (uh = uhp; uh != NULL; uh = uh->uh_prev)
|
|
|
1258 {
|
|
7
|
1259 uh->uh_flags |= UH_CHANGED;
|
|
758
|
1260 if (uh->uh_alt_next != NULL)
|
|
|
1261 u_unch_branch(uh->uh_alt_next); /* recursive */
|
|
|
1262 }
|
|
7
|
1263 }
|
|
|
1264
|
|
|
1265 /*
|
|
|
1266 * Get pointer to last added entry.
|
|
|
1267 * If it's not valid, give an error message and return NULL.
|
|
|
1268 */
|
|
|
1269 static u_entry_T *
|
|
|
1270 u_get_headentry()
|
|
|
1271 {
|
|
|
1272 if (curbuf->b_u_newhead == NULL || curbuf->b_u_newhead->uh_entry == NULL)
|
|
|
1273 {
|
|
|
1274 EMSG(_("E439: undo list corrupt"));
|
|
|
1275 return NULL;
|
|
|
1276 }
|
|
|
1277 return curbuf->b_u_newhead->uh_entry;
|
|
|
1278 }
|
|
|
1279
|
|
|
1280 /*
|
|
|
1281 * u_getbot(): compute the line number of the previous u_save
|
|
|
1282 * It is called only when b_u_synced is FALSE.
|
|
|
1283 */
|
|
|
1284 static void
|
|
|
1285 u_getbot()
|
|
|
1286 {
|
|
|
1287 u_entry_T *uep;
|
|
|
1288 linenr_T extra;
|
|
|
1289
|
|
|
1290 uep = u_get_headentry(); /* check for corrupt undo list */
|
|
|
1291 if (uep == NULL)
|
|
|
1292 return;
|
|
|
1293
|
|
|
1294 uep = curbuf->b_u_newhead->uh_getbot_entry;
|
|
|
1295 if (uep != NULL)
|
|
|
1296 {
|
|
|
1297 /*
|
|
|
1298 * the new ue_bot is computed from the number of lines that has been
|
|
|
1299 * inserted (0 - deleted) since calling u_save. This is equal to the
|
|
|
1300 * old line count subtracted from the current line count.
|
|
|
1301 */
|
|
|
1302 extra = curbuf->b_ml.ml_line_count - uep->ue_lcount;
|
|
|
1303 uep->ue_bot = uep->ue_top + uep->ue_size + 1 + extra;
|
|
|
1304 if (uep->ue_bot < 1 || uep->ue_bot > curbuf->b_ml.ml_line_count)
|
|
|
1305 {
|
|
|
1306 EMSG(_("E440: undo line missing"));
|
|
|
1307 uep->ue_bot = uep->ue_top + 1; /* assume all lines deleted, will
|
|
|
1308 * get all the old lines back
|
|
|
1309 * without deleting the current
|
|
|
1310 * ones */
|
|
|
1311 }
|
|
|
1312
|
|
|
1313 curbuf->b_u_newhead->uh_getbot_entry = NULL;
|
|
|
1314 }
|
|
|
1315
|
|
|
1316 curbuf->b_u_synced = TRUE;
|
|
|
1317 }
|
|
|
1318
|
|
|
1319 /*
|
|
753
|
1320 * Free one header and its entry list and adjust the pointers.
|
|
7
|
1321 */
|
|
|
1322 static void
|
|
758
|
1323 u_freeheader(buf, uhp, uhpp)
|
|
168
|
1324 buf_T *buf;
|
|
753
|
1325 u_header_T *uhp;
|
|
|
1326 u_header_T **uhpp; /* if not NULL reset when freeing this header */
|
|
7
|
1327 {
|
|
753
|
1328 /* When there is an alternate redo list free that branch completely,
|
|
|
1329 * because we can never go there. */
|
|
|
1330 if (uhp->uh_alt_next != NULL)
|
|
|
1331 u_freebranch(buf, uhp->uh_alt_next, uhpp);
|
|
7
|
1332
|
|
753
|
1333 if (uhp->uh_alt_prev != NULL)
|
|
|
1334 uhp->uh_alt_prev->uh_alt_next = NULL;
|
|
7
|
1335
|
|
753
|
1336 /* Update the links in the list to remove the header. */
|
|
7
|
1337 if (uhp->uh_next == NULL)
|
|
168
|
1338 buf->b_u_oldhead = uhp->uh_prev;
|
|
7
|
1339 else
|
|
|
1340 uhp->uh_next->uh_prev = uhp->uh_prev;
|
|
|
1341
|
|
|
1342 if (uhp->uh_prev == NULL)
|
|
168
|
1343 buf->b_u_newhead = uhp->uh_next;
|
|
7
|
1344 else
|
|
|
1345 uhp->uh_prev->uh_next = uhp->uh_next;
|
|
|
1346
|
|
753
|
1347 u_freeentries(buf, uhp, uhpp);
|
|
|
1348 }
|
|
|
1349
|
|
|
1350 /*
|
|
758
|
1351 * Free an alternate branch and any following alternate branches.
|
|
753
|
1352 */
|
|
|
1353 static void
|
|
|
1354 u_freebranch(buf, uhp, uhpp)
|
|
|
1355 buf_T *buf;
|
|
|
1356 u_header_T *uhp;
|
|
|
1357 u_header_T **uhpp; /* if not NULL reset when freeing this header */
|
|
|
1358 {
|
|
|
1359 u_header_T *tofree, *next;
|
|
|
1360
|
|
|
1361 if (uhp->uh_alt_prev != NULL)
|
|
|
1362 uhp->uh_alt_prev->uh_alt_next = NULL;
|
|
|
1363
|
|
|
1364 next = uhp;
|
|
|
1365 while (next != NULL)
|
|
|
1366 {
|
|
|
1367 tofree = next;
|
|
|
1368 if (tofree->uh_alt_next != NULL)
|
|
|
1369 u_freebranch(buf, tofree->uh_alt_next, uhpp); /* recursive */
|
|
|
1370 next = tofree->uh_prev;
|
|
|
1371 u_freeentries(buf, tofree, uhpp);
|
|
|
1372 }
|
|
|
1373 }
|
|
|
1374
|
|
|
1375 /*
|
|
|
1376 * Free all the undo entries for one header and the header itself.
|
|
|
1377 * This means that "uhp" is invalid when returning.
|
|
|
1378 */
|
|
|
1379 static void
|
|
|
1380 u_freeentries(buf, uhp, uhpp)
|
|
|
1381 buf_T *buf;
|
|
|
1382 u_header_T *uhp;
|
|
|
1383 u_header_T **uhpp; /* if not NULL reset when freeing this header */
|
|
|
1384 {
|
|
|
1385 u_entry_T *uep, *nuep;
|
|
|
1386
|
|
|
1387 /* Check for pointers to the header that become invalid now. */
|
|
|
1388 if (buf->b_u_curhead == uhp)
|
|
|
1389 buf->b_u_curhead = NULL;
|
|
|
1390 if (uhpp != NULL && uhp == *uhpp)
|
|
|
1391 *uhpp = NULL;
|
|
|
1392
|
|
|
1393 for (uep = uhp->uh_entry; uep != NULL; uep = nuep)
|
|
|
1394 {
|
|
|
1395 nuep = uep->ue_next;
|
|
|
1396 u_freeentry(uep, uep->ue_size);
|
|
|
1397 }
|
|
|
1398
|
|
168
|
1399 U_FREE_LINE((char_u *)uhp);
|
|
|
1400 --buf->b_u_numhead;
|
|
7
|
1401 }
|
|
|
1402
|
|
|
1403 /*
|
|
|
1404 * free entry 'uep' and 'n' lines in uep->ue_array[]
|
|
|
1405 */
|
|
|
1406 static void
|
|
|
1407 u_freeentry(uep, n)
|
|
|
1408 u_entry_T *uep;
|
|
|
1409 long n;
|
|
|
1410 {
|
|
414
|
1411 while (n > 0)
|
|
168
|
1412 U_FREE_LINE(uep->ue_array[--n]);
|
|
359
|
1413 U_FREE_LINE((char_u *)uep->ue_array);
|
|
168
|
1414 U_FREE_LINE((char_u *)uep);
|
|
7
|
1415 }
|
|
|
1416
|
|
|
1417 /*
|
|
|
1418 * invalidate the undo buffer; called when storage has already been released
|
|
|
1419 */
|
|
|
1420 void
|
|
|
1421 u_clearall(buf)
|
|
|
1422 buf_T *buf;
|
|
|
1423 {
|
|
|
1424 buf->b_u_newhead = buf->b_u_oldhead = buf->b_u_curhead = NULL;
|
|
|
1425 buf->b_u_synced = TRUE;
|
|
|
1426 buf->b_u_numhead = 0;
|
|
|
1427 buf->b_u_line_ptr = NULL;
|
|
|
1428 buf->b_u_line_lnum = 0;
|
|
|
1429 }
|
|
|
1430
|
|
|
1431 /*
|
|
|
1432 * save the line "lnum" for the "U" command
|
|
|
1433 */
|
|
|
1434 void
|
|
|
1435 u_saveline(lnum)
|
|
|
1436 linenr_T lnum;
|
|
|
1437 {
|
|
|
1438 if (lnum == curbuf->b_u_line_lnum) /* line is already saved */
|
|
|
1439 return;
|
|
356
|
1440 if (lnum < 1 || lnum > curbuf->b_ml.ml_line_count) /* should never happen */
|
|
7
|
1441 return;
|
|
|
1442 u_clearline();
|
|
|
1443 curbuf->b_u_line_lnum = lnum;
|
|
|
1444 if (curwin->w_cursor.lnum == lnum)
|
|
|
1445 curbuf->b_u_line_colnr = curwin->w_cursor.col;
|
|
|
1446 else
|
|
|
1447 curbuf->b_u_line_colnr = 0;
|
|
|
1448 if ((curbuf->b_u_line_ptr = u_save_line(lnum)) == NULL)
|
|
|
1449 do_outofmem_msg((long_u)0);
|
|
|
1450 }
|
|
|
1451
|
|
|
1452 /*
|
|
|
1453 * clear the line saved for the "U" command
|
|
|
1454 * (this is used externally for crossing a line while in insert mode)
|
|
|
1455 */
|
|
|
1456 void
|
|
|
1457 u_clearline()
|
|
|
1458 {
|
|
|
1459 if (curbuf->b_u_line_ptr != NULL)
|
|
|
1460 {
|
|
168
|
1461 U_FREE_LINE(curbuf->b_u_line_ptr);
|
|
7
|
1462 curbuf->b_u_line_ptr = NULL;
|
|
|
1463 curbuf->b_u_line_lnum = 0;
|
|
|
1464 }
|
|
|
1465 }
|
|
|
1466
|
|
|
1467 /*
|
|
|
1468 * Implementation of the "U" command.
|
|
|
1469 * Differentiation from vi: "U" can be undone with the next "U".
|
|
|
1470 * We also allow the cursor to be in another line.
|
|
|
1471 */
|
|
|
1472 void
|
|
|
1473 u_undoline()
|
|
|
1474 {
|
|
|
1475 colnr_T t;
|
|
|
1476 char_u *oldp;
|
|
|
1477
|
|
|
1478 if (undo_off)
|
|
|
1479 return;
|
|
|
1480
|
|
|
1481 if (curbuf->b_u_line_ptr == NULL ||
|
|
|
1482 curbuf->b_u_line_lnum > curbuf->b_ml.ml_line_count)
|
|
|
1483 {
|
|
|
1484 beep_flush();
|
|
|
1485 return;
|
|
|
1486 }
|
|
|
1487 /* first save the line for the 'u' command */
|
|
|
1488 if (u_savecommon(curbuf->b_u_line_lnum - 1,
|
|
|
1489 curbuf->b_u_line_lnum + 1, (linenr_T)0) == FAIL)
|
|
|
1490 return;
|
|
|
1491 oldp = u_save_line(curbuf->b_u_line_lnum);
|
|
|
1492 if (oldp == NULL)
|
|
|
1493 {
|
|
|
1494 do_outofmem_msg((long_u)0);
|
|
|
1495 return;
|
|
|
1496 }
|
|
|
1497 ml_replace(curbuf->b_u_line_lnum, curbuf->b_u_line_ptr, TRUE);
|
|
|
1498 changed_bytes(curbuf->b_u_line_lnum, 0);
|
|
168
|
1499 U_FREE_LINE(curbuf->b_u_line_ptr);
|
|
7
|
1500 curbuf->b_u_line_ptr = oldp;
|
|
|
1501
|
|
|
1502 t = curbuf->b_u_line_colnr;
|
|
|
1503 if (curwin->w_cursor.lnum == curbuf->b_u_line_lnum)
|
|
|
1504 curbuf->b_u_line_colnr = curwin->w_cursor.col;
|
|
|
1505 curwin->w_cursor.col = t;
|
|
|
1506 curwin->w_cursor.lnum = curbuf->b_u_line_lnum;
|
|
|
1507 }
|
|
|
1508
|
|
|
1509 /*
|
|
168
|
1510 * There are two implementations of the memory management for undo:
|
|
|
1511 * 1. Use the standard malloc()/free() functions.
|
|
|
1512 * This should be fast for allocating memory, but when a buffer is
|
|
|
1513 * abandoned every single allocated chunk must be freed, which may be slow.
|
|
|
1514 * 2. Allocate larger blocks of memory and keep track of chunks ourselves.
|
|
|
1515 * This is fast for abandoning, but the use of linked lists is slow for
|
|
|
1516 * finding a free chunk. Esp. when a lot of lines are changed or deleted.
|
|
|
1517 * A bit of profiling showed that the first method is faster, especially when
|
|
|
1518 * making a large number of changes, under the condition that malloc()/free()
|
|
|
1519 * is implemented efficiently.
|
|
|
1520 */
|
|
|
1521 #ifdef U_USE_MALLOC
|
|
|
1522 /*
|
|
|
1523 * Version of undo memory allocation using malloc()/free()
|
|
|
1524 *
|
|
|
1525 * U_FREE_LINE() and U_ALLOC_LINE() are macros that invoke vim_free() and
|
|
|
1526 * lalloc() directly.
|
|
|
1527 */
|
|
|
1528
|
|
|
1529 /*
|
|
|
1530 * Free all allocated memory blocks for the buffer 'buf'.
|
|
|
1531 */
|
|
|
1532 void
|
|
|
1533 u_blockfree(buf)
|
|
|
1534 buf_T *buf;
|
|
|
1535 {
|
|
753
|
1536 while (buf->b_u_oldhead != NULL)
|
|
758
|
1537 u_freeheader(buf, buf->b_u_oldhead, NULL);
|
|
359
|
1538 U_FREE_LINE(buf->b_u_line_ptr);
|
|
168
|
1539 }
|
|
|
1540
|
|
|
1541 #else
|
|
|
1542 /*
|
|
|
1543 * Storage allocation for the undo lines and blocks of the current file.
|
|
|
1544 * Version where Vim keeps track of the available memory.
|
|
7
|
1545 */
|
|
|
1546
|
|
|
1547 /*
|
|
|
1548 * Memory is allocated in relatively large blocks. These blocks are linked
|
|
|
1549 * in the allocated block list, headed by curbuf->b_block_head. They are all
|
|
|
1550 * freed when abandoning a file, so we don't have to free every single line.
|
|
|
1551 * The list is kept sorted on memory address.
|
|
|
1552 * block_alloc() allocates a block.
|
|
|
1553 * m_blockfree() frees all blocks.
|
|
|
1554 *
|
|
|
1555 * The available chunks of memory are kept in free chunk lists. There is
|
|
|
1556 * one free list for each block of allocated memory. The list is kept sorted
|
|
|
1557 * on memory address.
|
|
|
1558 * u_alloc_line() gets a chunk from the free lists.
|
|
|
1559 * u_free_line() returns a chunk to the free lists.
|
|
|
1560 * curbuf->b_m_search points to the chunk before the chunk that was
|
|
|
1561 * freed/allocated the last time.
|
|
|
1562 * curbuf->b_mb_current points to the b_head where curbuf->b_m_search
|
|
|
1563 * points into the free list.
|
|
|
1564 *
|
|
|
1565 *
|
|
|
1566 * b_block_head /---> block #1 /---> block #2
|
|
|
1567 * mb_next ---/ mb_next ---/ mb_next ---> NULL
|
|
|
1568 * mb_info mb_info mb_info
|
|
|
1569 * | | |
|
|
|
1570 * V V V
|
|
|
1571 * NULL free chunk #1.1 free chunk #2.1
|
|
|
1572 * | |
|
|
|
1573 * V V
|
|
|
1574 * free chunk #1.2 NULL
|
|
|
1575 * |
|
|
|
1576 * V
|
|
|
1577 * NULL
|
|
|
1578 *
|
|
|
1579 * When a single free chunk list would have been used, it could take a lot
|
|
|
1580 * of time in u_free_line() to find the correct place to insert a chunk in the
|
|
|
1581 * free list. The single free list would become very long when many lines are
|
|
|
1582 * changed (e.g. with :%s/^M$//).
|
|
|
1583 */
|
|
|
1584
|
|
|
1585 /*
|
|
|
1586 * this blocksize is used when allocating new lines
|
|
|
1587 */
|
|
|
1588 #define MEMBLOCKSIZE 2044
|
|
|
1589
|
|
|
1590 /*
|
|
|
1591 * The size field contains the size of the chunk, including the size field
|
|
|
1592 * itself.
|
|
|
1593 *
|
|
|
1594 * When the chunk is not in-use it is preceded with the m_info structure.
|
|
|
1595 * The m_next field links it in one of the free chunk lists.
|
|
|
1596 *
|
|
|
1597 * On most unix systems structures have to be longword (32 or 64 bit) aligned.
|
|
|
1598 * On most other systems they are short (16 bit) aligned.
|
|
|
1599 */
|
|
|
1600
|
|
|
1601 /* the structure definitions are now in structs.h */
|
|
|
1602
|
|
|
1603 #ifdef ALIGN_LONG
|
|
|
1604 /* size of m_size */
|
|
|
1605 # define M_OFFSET (sizeof(long_u))
|
|
|
1606 #else
|
|
|
1607 /* size of m_size */
|
|
|
1608 # define M_OFFSET (sizeof(short_u))
|
|
|
1609 #endif
|
|
|
1610
|
|
168
|
1611 static char_u *u_blockalloc __ARGS((long_u));
|
|
|
1612
|
|
7
|
1613 /*
|
|
|
1614 * Allocate a block of memory and link it in the allocated block list.
|
|
|
1615 */
|
|
|
1616 static char_u *
|
|
|
1617 u_blockalloc(size)
|
|
|
1618 long_u size;
|
|
|
1619 {
|
|
|
1620 mblock_T *p;
|
|
|
1621 mblock_T *mp, *next;
|
|
|
1622
|
|
|
1623 p = (mblock_T *)lalloc(size + sizeof(mblock_T), FALSE);
|
|
|
1624 if (p != NULL)
|
|
|
1625 {
|
|
|
1626 /* Insert the block into the allocated block list, keeping it
|
|
|
1627 sorted on address. */
|
|
|
1628 for (mp = &curbuf->b_block_head;
|
|
|
1629 (next = mp->mb_next) != NULL && next < p;
|
|
|
1630 mp = next)
|
|
|
1631 ;
|
|
|
1632 p->mb_next = next; /* link in block list */
|
|
|
1633 p->mb_size = size;
|
|
168
|
1634 p->mb_maxsize = 0; /* nothing free yet */
|
|
7
|
1635 mp->mb_next = p;
|
|
|
1636 p->mb_info.m_next = NULL; /* clear free list */
|
|
|
1637 p->mb_info.m_size = 0;
|
|
|
1638 curbuf->b_mb_current = p; /* remember current block */
|
|
|
1639 curbuf->b_m_search = NULL;
|
|
|
1640 p++; /* return usable memory */
|
|
|
1641 }
|
|
|
1642 return (char_u *)p;
|
|
|
1643 }
|
|
|
1644
|
|
|
1645 /*
|
|
|
1646 * free all allocated memory blocks for the buffer 'buf'
|
|
|
1647 */
|
|
|
1648 void
|
|
|
1649 u_blockfree(buf)
|
|
|
1650 buf_T *buf;
|
|
|
1651 {
|
|
|
1652 mblock_T *p, *np;
|
|
|
1653
|
|
|
1654 for (p = buf->b_block_head.mb_next; p != NULL; p = np)
|
|
|
1655 {
|
|
|
1656 np = p->mb_next;
|
|
|
1657 vim_free(p);
|
|
|
1658 }
|
|
|
1659 buf->b_block_head.mb_next = NULL;
|
|
|
1660 buf->b_m_search = NULL;
|
|
|
1661 buf->b_mb_current = NULL;
|
|
|
1662 }
|
|
|
1663
|
|
|
1664 /*
|
|
|
1665 * Free a chunk of memory for the current buffer.
|
|
|
1666 * Insert the chunk into the correct free list, keeping it sorted on address.
|
|
|
1667 */
|
|
|
1668 static void
|
|
|
1669 u_free_line(ptr, keep)
|
|
|
1670 char_u *ptr;
|
|
|
1671 int keep; /* don't free the block when it's empty */
|
|
|
1672 {
|
|
|
1673 minfo_T *next;
|
|
|
1674 minfo_T *prev, *curr;
|
|
|
1675 minfo_T *mp;
|
|
|
1676 mblock_T *nextb;
|
|
|
1677 mblock_T *prevb;
|
|
168
|
1678 long_u maxsize;
|
|
7
|
1679
|
|
|
1680 if (ptr == NULL || ptr == IObuff)
|
|
|
1681 return; /* illegal address can happen in out-of-memory situations */
|
|
|
1682
|
|
|
1683 mp = (minfo_T *)(ptr - M_OFFSET);
|
|
|
1684
|
|
|
1685 /* find block where chunk could be a part off */
|
|
|
1686 /* if we change curbuf->b_mb_current, curbuf->b_m_search is set to NULL */
|
|
|
1687 if (curbuf->b_mb_current == NULL || mp < (minfo_T *)curbuf->b_mb_current)
|
|
|
1688 {
|
|
|
1689 curbuf->b_mb_current = curbuf->b_block_head.mb_next;
|
|
|
1690 curbuf->b_m_search = NULL;
|
|
|
1691 }
|
|
|
1692 if ((nextb = curbuf->b_mb_current->mb_next) != NULL
|
|
|
1693 && (minfo_T *)nextb < mp)
|
|
|
1694 {
|
|
|
1695 curbuf->b_mb_current = nextb;
|
|
|
1696 curbuf->b_m_search = NULL;
|
|
|
1697 }
|
|
|
1698 while ((nextb = curbuf->b_mb_current->mb_next) != NULL
|
|
|
1699 && (minfo_T *)nextb < mp)
|
|
|
1700 curbuf->b_mb_current = nextb;
|
|
|
1701
|
|
|
1702 curr = NULL;
|
|
|
1703 /*
|
|
|
1704 * If mp is smaller than curbuf->b_m_search->m_next go to the start of
|
|
|
1705 * the free list
|
|
|
1706 */
|
|
|
1707 if (curbuf->b_m_search == NULL || mp < (curbuf->b_m_search->m_next))
|
|
|
1708 next = &(curbuf->b_mb_current->mb_info);
|
|
|
1709 else
|
|
|
1710 next = curbuf->b_m_search;
|
|
|
1711 /*
|
|
|
1712 * The following loop is executed very often.
|
|
|
1713 * Therefore it has been optimized at the cost of readability.
|
|
|
1714 * Keep it fast!
|
|
|
1715 */
|
|
|
1716 #ifdef SLOW_BUT_EASY_TO_READ
|
|
|
1717 do
|
|
|
1718 {
|
|
|
1719 prev = curr;
|
|
|
1720 curr = next;
|
|
|
1721 next = next->m_next;
|
|
|
1722 }
|
|
|
1723 while (mp > next && next != NULL);
|
|
|
1724 #else
|
|
|
1725 do /* first, middle, last */
|
|
|
1726 {
|
|
|
1727 prev = next->m_next; /* curr, next, prev */
|
|
|
1728 if (prev == NULL || mp <= prev)
|
|
|
1729 {
|
|
|
1730 prev = curr;
|
|
|
1731 curr = next;
|
|
|
1732 next = next->m_next;
|
|
|
1733 break;
|
|
|
1734 }
|
|
|
1735 curr = prev->m_next; /* next, prev, curr */
|
|
|
1736 if (curr == NULL || mp <= curr)
|
|
|
1737 {
|
|
|
1738 prev = next;
|
|
|
1739 curr = prev->m_next;
|
|
|
1740 next = curr->m_next;
|
|
|
1741 break;
|
|
|
1742 }
|
|
|
1743 next = curr->m_next; /* prev, curr, next */
|
|
|
1744 }
|
|
|
1745 while (mp > next && next != NULL);
|
|
|
1746 #endif
|
|
|
1747
|
|
|
1748 /* if *mp and *next are concatenated, join them into one chunk */
|
|
|
1749 if ((char_u *)mp + mp->m_size == (char_u *)next)
|
|
|
1750 {
|
|
|
1751 mp->m_size += next->m_size;
|
|
|
1752 mp->m_next = next->m_next;
|
|
|
1753 }
|
|
|
1754 else
|
|
|
1755 mp->m_next = next;
|
|
168
|
1756 maxsize = mp->m_size;
|
|
7
|
1757
|
|
|
1758 /* if *curr and *mp are concatenated, join them */
|
|
|
1759 if (prev != NULL && (char_u *)curr + curr->m_size == (char_u *)mp)
|
|
|
1760 {
|
|
|
1761 curr->m_size += mp->m_size;
|
|
168
|
1762 maxsize = curr->m_size;
|
|
7
|
1763 curr->m_next = mp->m_next;
|
|
|
1764 curbuf->b_m_search = prev;
|
|
|
1765 }
|
|
|
1766 else
|
|
|
1767 {
|
|
|
1768 curr->m_next = mp;
|
|
|
1769 curbuf->b_m_search = curr; /* put curbuf->b_m_search before freed
|
|
|
1770 chunk */
|
|
|
1771 }
|
|
|
1772
|
|
|
1773 /*
|
|
|
1774 * If the block only containes free memory now, release it.
|
|
|
1775 */
|
|
|
1776 if (!keep && curbuf->b_mb_current->mb_size
|
|
|
1777 == curbuf->b_mb_current->mb_info.m_next->m_size)
|
|
|
1778 {
|
|
|
1779 /* Find the block before the current one to be able to unlink it from
|
|
|
1780 * the list of blocks. */
|
|
|
1781 prevb = &curbuf->b_block_head;
|
|
|
1782 for (nextb = prevb->mb_next; nextb != curbuf->b_mb_current;
|
|
|
1783 nextb = nextb->mb_next)
|
|
|
1784 prevb = nextb;
|
|
|
1785 prevb->mb_next = nextb->mb_next;
|
|
|
1786 vim_free(nextb);
|
|
|
1787 curbuf->b_mb_current = NULL;
|
|
|
1788 curbuf->b_m_search = NULL;
|
|
|
1789 }
|
|
168
|
1790 else if (curbuf->b_mb_current->mb_maxsize < maxsize)
|
|
|
1791 curbuf->b_mb_current->mb_maxsize = maxsize;
|
|
7
|
1792 }
|
|
|
1793
|
|
|
1794 /*
|
|
|
1795 * Allocate and initialize a new line structure with room for at least
|
|
|
1796 * 'size' characters plus a terminating NUL.
|
|
|
1797 */
|
|
|
1798 static char_u *
|
|
|
1799 u_alloc_line(size)
|
|
|
1800 unsigned size;
|
|
|
1801 {
|
|
|
1802 minfo_T *mp, *mprev, *mp2;
|
|
|
1803 mblock_T *mbp;
|
|
|
1804 int size_align;
|
|
|
1805
|
|
|
1806 /*
|
|
|
1807 * Add room for size field and trailing NUL byte.
|
|
|
1808 * Adjust for minimal size (must be able to store minfo_T
|
|
|
1809 * plus a trailing NUL, so the chunk can be released again)
|
|
|
1810 */
|
|
|
1811 size += M_OFFSET + 1;
|
|
|
1812 if (size < sizeof(minfo_T) + 1)
|
|
|
1813 size = sizeof(minfo_T) + 1;
|
|
|
1814
|
|
|
1815 /*
|
|
|
1816 * round size up for alignment
|
|
|
1817 */
|
|
|
1818 size_align = (size + ALIGN_MASK) & ~ALIGN_MASK;
|
|
|
1819
|
|
|
1820 /*
|
|
|
1821 * If curbuf->b_m_search is NULL (uninitialized free list) start at
|
|
|
1822 * curbuf->b_block_head
|
|
|
1823 */
|
|
|
1824 if (curbuf->b_mb_current == NULL || curbuf->b_m_search == NULL)
|
|
|
1825 {
|
|
|
1826 curbuf->b_mb_current = &curbuf->b_block_head;
|
|
|
1827 curbuf->b_m_search = &(curbuf->b_block_head.mb_info);
|
|
|
1828 }
|
|
|
1829
|
|
168
|
1830 /* Search for a block with enough space. */
|
|
7
|
1831 mbp = curbuf->b_mb_current;
|
|
168
|
1832 while (mbp->mb_maxsize < size_align)
|
|
7
|
1833 {
|
|
168
|
1834 if (mbp->mb_next != NULL)
|
|
7
|
1835 mbp = mbp->mb_next;
|
|
|
1836 else
|
|
|
1837 mbp = &curbuf->b_block_head;
|
|
168
|
1838 if (mbp == curbuf->b_mb_current)
|
|
7
|
1839 {
|
|
168
|
1840 int n = (size_align > (MEMBLOCKSIZE / 4)
|
|
|
1841 ? size_align : MEMBLOCKSIZE);
|
|
7
|
1842
|
|
168
|
1843 /* Back where we started in block list: need to add a new block
|
|
|
1844 * with enough space. */
|
|
|
1845 mp = (minfo_T *)u_blockalloc((long_u)n);
|
|
|
1846 if (mp == NULL)
|
|
|
1847 return (NULL);
|
|
|
1848 mp->m_size = n;
|
|
|
1849 u_free_line((char_u *)mp + M_OFFSET, TRUE);
|
|
|
1850 mbp = curbuf->b_mb_current;
|
|
|
1851 break;
|
|
|
1852 }
|
|
|
1853 }
|
|
|
1854 if (mbp != curbuf->b_mb_current)
|
|
|
1855 curbuf->b_m_search = &(mbp->mb_info);
|
|
|
1856
|
|
|
1857 /* In this block find a chunk with enough space. */
|
|
|
1858 mprev = curbuf->b_m_search;
|
|
|
1859 mp = curbuf->b_m_search->m_next;
|
|
407
|
1860 for (;;)
|
|
168
|
1861 {
|
|
|
1862 if (mp == NULL) /* at end of the list */
|
|
|
1863 mp = &(mbp->mb_info); /* wrap around to begin */
|
|
|
1864 if (mp->m_size >= size)
|
|
|
1865 break;
|
|
|
1866 if (mp == curbuf->b_m_search)
|
|
|
1867 {
|
|
|
1868 /* back where we started in free chunk list: "cannot happen" */
|
|
|
1869 EMSG2(_(e_intern2), "u_alloc_line()");
|
|
|
1870 return NULL;
|
|
7
|
1871 }
|
|
|
1872 mprev = mp;
|
|
168
|
1873 mp = mp->m_next;
|
|
7
|
1874 }
|
|
|
1875
|
|
168
|
1876 /* when using the largest chunk adjust mb_maxsize */
|
|
|
1877 if (mp->m_size >= mbp->mb_maxsize)
|
|
|
1878 mbp->mb_maxsize = 0;
|
|
|
1879
|
|
7
|
1880 /* if the chunk we found is large enough, split it up in two */
|
|
|
1881 if ((long)mp->m_size - size_align >= (long)(sizeof(minfo_T) + 1))
|
|
|
1882 {
|
|
|
1883 mp2 = (minfo_T *)((char_u *)mp + size_align);
|
|
|
1884 mp2->m_size = mp->m_size - size_align;
|
|
|
1885 mp2->m_next = mp->m_next;
|
|
|
1886 mprev->m_next = mp2;
|
|
|
1887 mp->m_size = size_align;
|
|
|
1888 }
|
|
|
1889 else /* remove *mp from the free list */
|
|
|
1890 {
|
|
|
1891 mprev->m_next = mp->m_next;
|
|
|
1892 }
|
|
|
1893 curbuf->b_m_search = mprev;
|
|
|
1894 curbuf->b_mb_current = mbp;
|
|
|
1895
|
|
168
|
1896 /* If using the largest chunk need to find the new largest chunk */
|
|
|
1897 if (mbp->mb_maxsize == 0)
|
|
|
1898 for (mp2 = &(mbp->mb_info); mp2 != NULL; mp2 = mp2->m_next)
|
|
|
1899 if (mbp->mb_maxsize < mp2->m_size)
|
|
|
1900 mbp->mb_maxsize = mp2->m_size;
|
|
|
1901
|
|
7
|
1902 mp = (minfo_T *)((char_u *)mp + M_OFFSET);
|
|
|
1903 *(char_u *)mp = NUL; /* set the first byte to NUL */
|
|
|
1904
|
|
|
1905 return ((char_u *)mp);
|
|
|
1906 }
|
|
168
|
1907 #endif
|
|
7
|
1908
|
|
|
1909 /*
|
|
|
1910 * u_save_line(): allocate memory with u_alloc_line() and copy line 'lnum'
|
|
|
1911 * into it.
|
|
|
1912 */
|
|
|
1913 static char_u *
|
|
|
1914 u_save_line(lnum)
|
|
|
1915 linenr_T lnum;
|
|
|
1916 {
|
|
|
1917 char_u *src;
|
|
|
1918 char_u *dst;
|
|
|
1919 unsigned len;
|
|
|
1920
|
|
|
1921 src = ml_get(lnum);
|
|
|
1922 len = (unsigned)STRLEN(src);
|
|
168
|
1923 if ((dst = U_ALLOC_LINE(len)) != NULL)
|
|
7
|
1924 mch_memmove(dst, src, (size_t)(len + 1));
|
|
|
1925 return (dst);
|
|
|
1926 }
|
|
|
1927
|
|
|
1928 /*
|
|
|
1929 * Check if the 'modified' flag is set, or 'ff' has changed (only need to
|
|
|
1930 * check the first character, because it can only be "dos", "unix" or "mac").
|
|
|
1931 * "nofile" and "scratch" type buffers are considered to always be unchanged.
|
|
|
1932 */
|
|
|
1933 int
|
|
|
1934 bufIsChanged(buf)
|
|
|
1935 buf_T *buf;
|
|
|
1936 {
|
|
|
1937 return
|
|
|
1938 #ifdef FEAT_QUICKFIX
|
|
|
1939 !bt_dontwrite(buf) &&
|
|
|
1940 #endif
|
|
|
1941 (buf->b_changed || file_ff_differs(buf));
|
|
|
1942 }
|
|
|
1943
|
|
|
1944 int
|
|
|
1945 curbufIsChanged()
|
|
|
1946 {
|
|
|
1947 return
|
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1948 #ifdef FEAT_QUICKFIX
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1949 !bt_dontwrite(curbuf) &&
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1950 #endif
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1951 (curbuf->b_changed || file_ff_differs(curbuf));
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1952 }
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