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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 * memfile.c: Contains the functions for handling blocks of memory which can
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12 * be stored in a file. This is the implementation of a sort of virtual memory.
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13 *
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14 * A memfile consists of a sequence of blocks. The blocks numbered from 0
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15 * upwards have been assigned a place in the actual file. The block number
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16 * is equal to the page number in the file. The
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17 * blocks with negative numbers are currently in memory only. They can be
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18 * assigned a place in the file when too much memory is being used. At that
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19 * moment they get a new, positive, number. A list is used for translation of
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20 * negative to positive numbers.
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21 *
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22 * The size of a block is a multiple of a page size, normally the page size of
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23 * the device the file is on. Most blocks are 1 page long. A Block of multiple
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24 * pages is used for a line that does not fit in a single page.
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25 *
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26 * Each block can be in memory and/or in a file. The block stays in memory
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27 * as long as it is locked. If it is no longer locked it can be swapped out to
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28 * the file. It is only written to the file if it has been changed.
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29 *
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30 * Under normal operation the file is created when opening the memory file and
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31 * deleted when closing the memory file. Only with recovery an existing memory
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32 * file is opened.
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33 */
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34
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35 #if defined MSDOS || defined(WIN32) || defined(_WIN64)
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36 # include <io.h> /* for lseek(), must be before vim.h */
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37 #endif
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38
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39 #include "vim.h"
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40
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41 #ifdef HAVE_FCNTL_H
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42 # include <fcntl.h>
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43 #endif
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44
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45 /*
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46 * Some systems have the page size in statfs.f_bsize, some in stat.st_blksize
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47 */
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48 #ifdef HAVE_ST_BLKSIZE
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49 # define STATFS stat
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50 # define F_BSIZE st_blksize
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51 # define fstatfs(fd, buf, len, nul) mch_fstat((fd), (buf))
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52 #else
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53 # ifdef HAVE_SYS_STATFS_H
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54 # include <sys/statfs.h>
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55 # define STATFS statfs
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56 # define F_BSIZE f_bsize
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57 # ifdef __MINT__ /* do we still need this? */
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58 # define fstatfs(fd, buf, len, nul) mch_fstat((fd), (buf))
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59 # endif
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60 # endif
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61 #endif
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62
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63 /*
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64 * for Amiga Dos 2.0x we use Flush
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65 */
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66 #ifdef AMIGA
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67 # ifdef FEAT_ARP
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68 extern int dos2; /* this is in os_amiga.c */
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69 # endif
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70 # ifdef SASC
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71 # include <proto/dos.h>
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72 # include <ios1.h> /* for chkufb() */
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73 # endif
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74 #endif
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75
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76 #define MEMFILE_PAGE_SIZE 4096 /* default page size */
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77
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78 static long_u total_mem_used = 0; /* total memory used for memfiles */
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79 static int dont_release = FALSE; /* don't release blocks */
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80
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81 static void mf_ins_hash __ARGS((memfile_T *, bhdr_T *));
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82 static void mf_rem_hash __ARGS((memfile_T *, bhdr_T *));
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83 static bhdr_T *mf_find_hash __ARGS((memfile_T *, blocknr_T));
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84 static void mf_ins_used __ARGS((memfile_T *, bhdr_T *));
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85 static void mf_rem_used __ARGS((memfile_T *, bhdr_T *));
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86 static bhdr_T *mf_release __ARGS((memfile_T *, int));
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87 static bhdr_T *mf_alloc_bhdr __ARGS((memfile_T *, int));
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88 static void mf_free_bhdr __ARGS((bhdr_T *));
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89 static void mf_ins_free __ARGS((memfile_T *, bhdr_T *));
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90 static bhdr_T *mf_rem_free __ARGS((memfile_T *));
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91 static int mf_read __ARGS((memfile_T *, bhdr_T *));
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92 static int mf_write __ARGS((memfile_T *, bhdr_T *));
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93 static int mf_trans_add __ARGS((memfile_T *, bhdr_T *));
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94 static void mf_do_open __ARGS((memfile_T *, char_u *, int));
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95
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96 /*
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97 * The functions for using a memfile:
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98 *
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99 * mf_open() open a new or existing memfile
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100 * mf_open_file() open a swap file for an existing memfile
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101 * mf_close() close (and delete) a memfile
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102 * mf_new() create a new block in a memfile and lock it
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103 * mf_get() get an existing block and lock it
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104 * mf_put() unlock a block, may be marked for writing
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105 * mf_free() remove a block
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106 * mf_sync() sync changed parts of memfile to disk
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107 * mf_release_all() release as much memory as possible
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108 * mf_trans_del() may translate negative to positive block number
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109 * mf_fullname() make file name full path (use before first :cd)
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110 */
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111
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112 /*
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113 * Open an existing or new memory block file.
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114 *
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115 * fname: name of file to use (NULL means no file at all)
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116 * Note: fname must have been allocated, it is not copied!
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117 * If opening the file fails, fname is freed.
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118 * flags: flags for open() call
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119 *
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120 * If fname != NULL and file cannot be opened, fail.
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121 *
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122 * return value: identifier for this memory block file.
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123 */
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124 memfile_T *
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125 mf_open(fname, flags)
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126 char_u *fname;
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127 int flags;
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128 {
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129 memfile_T *mfp;
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130 int i;
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131 off_t size;
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132 #if defined(STATFS) && defined(UNIX) && !defined(__QNX__)
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133 # define USE_FSTATFS
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134 struct STATFS stf;
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135 #endif
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136
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137 if ((mfp = (memfile_T *)alloc((unsigned)sizeof(memfile_T))) == NULL)
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138 return NULL;
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139
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140 if (fname == NULL) /* no file for this memfile, use memory only */
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141 {
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142 mfp->mf_fname = NULL;
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143 mfp->mf_ffname = NULL;
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144 mfp->mf_fd = -1;
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145 }
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146 else
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147 {
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148 mf_do_open(mfp, fname, flags); /* try to open the file */
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149
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150 /* if the file cannot be opened, return here */
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151 if (mfp->mf_fd < 0)
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152 {
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153 vim_free(mfp);
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154 return NULL;
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155 }
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156 }
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157
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158 mfp->mf_free_first = NULL; /* free list is empty */
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159 mfp->mf_used_first = NULL; /* used list is empty */
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160 mfp->mf_used_last = NULL;
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161 mfp->mf_dirty = FALSE;
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162 mfp->mf_used_count = 0;
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163 for (i = 0; i < MEMHASHSIZE; ++i)
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164 {
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165 mfp->mf_hash[i] = NULL; /* hash lists are empty */
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166 mfp->mf_trans[i] = NULL; /* trans lists are empty */
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167 }
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168 mfp->mf_page_size = MEMFILE_PAGE_SIZE;
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169
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170 #ifdef USE_FSTATFS
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171 /*
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172 * Try to set the page size equal to the block size of the device.
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173 * Speeds up I/O a lot.
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174 * When recovering, the actual block size will be retrieved from block 0
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175 * in ml_recover(). The size used here may be wrong, therefore
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176 * mf_blocknr_max must be rounded up.
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177 */
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178 if (mfp->mf_fd >= 0
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179 && fstatfs(mfp->mf_fd, &stf, sizeof(struct statfs), 0) == 0
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180 && stf.F_BSIZE >= MIN_SWAP_PAGE_SIZE
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181 && stf.F_BSIZE <= MAX_SWAP_PAGE_SIZE)
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182 mfp->mf_page_size = stf.F_BSIZE;
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183 #endif
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184
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185 if (mfp->mf_fd < 0 || (flags & (O_TRUNC|O_EXCL))
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186 || (size = lseek(mfp->mf_fd, (off_t)0L, SEEK_END)) <= 0)
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187 mfp->mf_blocknr_max = 0; /* no file or empty file */
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188 else
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189 mfp->mf_blocknr_max = (blocknr_T)((size + mfp->mf_page_size - 1)
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190 / mfp->mf_page_size);
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191 mfp->mf_blocknr_min = -1;
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192 mfp->mf_neg_count = 0;
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193 mfp->mf_infile_count = mfp->mf_blocknr_max;
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194 mfp->mf_used_count_max = p_mm * 1024 / mfp->mf_page_size;
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195
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196 return mfp;
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197 }
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198
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199 /*
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200 * Open a file for an existing memfile. Used when updatecount set from 0 to
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201 * some value.
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202 * If the file already exists, this fails.
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203 * "fname" is the name of file to use (NULL means no file at all)
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204 * Note: "fname" must have been allocated, it is not copied! If opening the
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205 * file fails, "fname" is freed.
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206 *
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207 * return value: FAIL if file could not be opened, OK otherwise
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208 */
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209 int
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210 mf_open_file(mfp, fname)
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211 memfile_T *mfp;
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212 char_u *fname;
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213 {
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214 mf_do_open(mfp, fname, O_RDWR|O_CREAT|O_EXCL); /* try to open the file */
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215
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216 if (mfp->mf_fd < 0)
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217 return FAIL;
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218
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219 mfp->mf_dirty = TRUE;
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220 return OK;
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221 }
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222
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223 /*
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224 * close a memory file and delete the associated file if 'del_file' is TRUE
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225 */
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226 void
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227 mf_close(mfp, del_file)
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228 memfile_T *mfp;
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229 int del_file;
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230 {
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231 bhdr_T *hp, *nextp;
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232 NR_TRANS *tp, *tpnext;
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233 int i;
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234
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235 if (mfp == NULL) /* safety check */
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236 return;
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237 if (mfp->mf_fd >= 0)
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238 {
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239 if (close(mfp->mf_fd) < 0)
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240 EMSG(_(e_swapclose));
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241 }
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242 if (del_file && mfp->mf_fname != NULL)
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243 mch_remove(mfp->mf_fname);
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244 /* free entries in used list */
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245 for (hp = mfp->mf_used_first; hp != NULL; hp = nextp)
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246 {
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247 total_mem_used -= hp->bh_page_count * mfp->mf_page_size;
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248 nextp = hp->bh_next;
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249 mf_free_bhdr(hp);
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250 }
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251 while (mfp->mf_free_first != NULL) /* free entries in free list */
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252 vim_free(mf_rem_free(mfp));
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253 for (i = 0; i < MEMHASHSIZE; ++i) /* free entries in trans lists */
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254 for (tp = mfp->mf_trans[i]; tp != NULL; tp = tpnext)
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255 {
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256 tpnext = tp->nt_next;
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257 vim_free(tp);
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258 }
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259 vim_free(mfp->mf_fname);
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260 vim_free(mfp->mf_ffname);
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261 vim_free(mfp);
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262 }
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263
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264 /*
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265 * Close the swap file for a memfile. Used when 'swapfile' is reset.
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266 */
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267 void
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268 mf_close_file(buf, getlines)
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269 buf_T *buf;
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270 int getlines; /* get all lines into memory? */
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271 {
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272 memfile_T *mfp;
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273 linenr_T lnum;
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274
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275 mfp = buf->b_ml.ml_mfp;
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276 if (mfp == NULL || mfp->mf_fd < 0) /* nothing to close */
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277 return;
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278
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279 if (getlines)
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280 {
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281 /* get all blocks in memory by accessing all lines (clumsy!) */
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282 dont_release = TRUE;
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283 for (lnum = 1; lnum <= buf->b_ml.ml_line_count; ++lnum)
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284 (void)ml_get_buf(buf, lnum, FALSE);
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285 dont_release = FALSE;
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286 /* TODO: should check if all blocks are really in core */
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287 }
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288
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289 if (close(mfp->mf_fd) < 0) /* close the file */
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290 EMSG(_(e_swapclose));
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291 mfp->mf_fd = -1;
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292
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293 if (mfp->mf_fname != NULL)
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294 {
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295 mch_remove(mfp->mf_fname); /* delete the swap file */
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296 vim_free(mfp->mf_fname);
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297 vim_free(mfp->mf_ffname);
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298 mfp->mf_fname = NULL;
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299 mfp->mf_ffname = NULL;
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300 }
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301 }
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302
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303 /*
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304 * Set new size for a memfile. Used when block 0 of a swapfile has been read
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305 * and the size it indicates differs from what was guessed.
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306 */
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307 void
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308 mf_new_page_size(mfp, new_size)
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309 memfile_T *mfp;
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310 unsigned new_size;
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311 {
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312 /* Correct the memory used for block 0 to the new size, because it will be
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313 * freed with that size later on. */
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314 total_mem_used += new_size - mfp->mf_page_size;
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315 mfp->mf_page_size = new_size;
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316 }
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317
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318 /*
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319 * get a new block
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320 *
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321 * negative: TRUE if negative block number desired (data block)
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322 */
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323 bhdr_T *
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324 mf_new(mfp, negative, page_count)
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325 memfile_T *mfp;
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326 int negative;
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327 int page_count;
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328 {
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329 bhdr_T *hp; /* new bhdr_T */
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330 bhdr_T *freep; /* first block in free list */
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331 char_u *p;
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332
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333 /*
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334 * If we reached the maximum size for the used memory blocks, release one
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335 * If a bhdr_T is returned, use it and adjust the page_count if necessary.
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336 */
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337 hp = mf_release(mfp, page_count);
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338
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339 /*
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340 * Decide on the number to use:
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341 * If there is a free block, use its number.
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342 * Otherwise use mf_block_min for a negative number, mf_block_max for
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343 * a positive number.
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344 */
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345 freep = mfp->mf_free_first;
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346 if (!negative && freep != NULL && freep->bh_page_count >= page_count)
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347 {
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348 /*
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349 * If the block in the free list has more pages, take only the number
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350 * of pages needed and allocate a new bhdr_T with data
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351 *
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352 * If the number of pages matches and mf_release did not return a bhdr_T,
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353 * use the bhdr_T from the free list and allocate the data
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354 *
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355 * If the number of pages matches and mf_release returned a bhdr_T,
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356 * just use the number and free the bhdr_T from the free list
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357 */
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358 if (freep->bh_page_count > page_count)
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359 {
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360 if (hp == NULL && (hp = mf_alloc_bhdr(mfp, page_count)) == NULL)
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361 return NULL;
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362 hp->bh_bnum = freep->bh_bnum;
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363 freep->bh_bnum += page_count;
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364 freep->bh_page_count -= page_count;
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365 }
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366 else if (hp == NULL) /* need to allocate memory for this block */
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367 {
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368 if ((p = (char_u *)alloc(mfp->mf_page_size * page_count)) == NULL)
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369 return NULL;
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370 hp = mf_rem_free(mfp);
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371 hp->bh_data = p;
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372 }
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373 else /* use the number, remove entry from free list */
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374 {
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375 freep = mf_rem_free(mfp);
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376 hp->bh_bnum = freep->bh_bnum;
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377 vim_free(freep);
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378 }
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379 }
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380 else /* get a new number */
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381 {
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382 if (hp == NULL && (hp = mf_alloc_bhdr(mfp, page_count)) == NULL)
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383 return NULL;
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384 if (negative)
|
|
|
385 {
|
|
|
386 hp->bh_bnum = mfp->mf_blocknr_min--;
|
|
|
387 mfp->mf_neg_count++;
|
|
|
388 }
|
|
|
389 else
|
|
|
390 {
|
|
|
391 hp->bh_bnum = mfp->mf_blocknr_max;
|
|
|
392 mfp->mf_blocknr_max += page_count;
|
|
|
393 }
|
|
|
394 }
|
|
|
395 hp->bh_flags = BH_LOCKED | BH_DIRTY; /* new block is always dirty */
|
|
|
396 mfp->mf_dirty = TRUE;
|
|
|
397 hp->bh_page_count = page_count;
|
|
|
398 mf_ins_used(mfp, hp);
|
|
|
399 mf_ins_hash(mfp, hp);
|
|
|
400
|
|
|
401 /*
|
|
|
402 * Init the data to all zero, to avoid reading uninitialized data.
|
|
|
403 * This also avoids that the passwd file ends up in the swap file!
|
|
|
404 */
|
|
|
405 (void)vim_memset((char *)(hp->bh_data), 0, (size_t)mfp->mf_page_size);
|
|
|
406
|
|
|
407 return hp;
|
|
|
408 }
|
|
|
409
|
|
|
410 /*
|
|
|
411 * get existing block 'nr' with 'page_count' pages
|
|
|
412 *
|
|
|
413 * Note: The caller should first check a negative nr with mf_trans_del()
|
|
|
414 */
|
|
|
415 bhdr_T *
|
|
|
416 mf_get(mfp, nr, page_count)
|
|
|
417 memfile_T *mfp;
|
|
|
418 blocknr_T nr;
|
|
|
419 int page_count;
|
|
|
420 {
|
|
|
421 bhdr_T *hp;
|
|
|
422 /* doesn't exist */
|
|
|
423 if (nr >= mfp->mf_blocknr_max || nr <= mfp->mf_blocknr_min)
|
|
|
424 return NULL;
|
|
|
425
|
|
|
426 /*
|
|
|
427 * see if it is in the cache
|
|
|
428 */
|
|
|
429 hp = mf_find_hash(mfp, nr);
|
|
|
430 if (hp == NULL) /* not in the hash list */
|
|
|
431 {
|
|
|
432 if (nr < 0 || nr >= mfp->mf_infile_count) /* can't be in the file */
|
|
|
433 return NULL;
|
|
|
434
|
|
|
435 /* could check here if the block is in the free list */
|
|
|
436
|
|
|
437 /*
|
|
|
438 * Check if we need to flush an existing block.
|
|
|
439 * If so, use that block.
|
|
|
440 * If not, allocate a new block.
|
|
|
441 */
|
|
|
442 hp = mf_release(mfp, page_count);
|
|
|
443 if (hp == NULL && (hp = mf_alloc_bhdr(mfp, page_count)) == NULL)
|
|
|
444 return NULL;
|
|
|
445
|
|
|
446 hp->bh_bnum = nr;
|
|
|
447 hp->bh_flags = 0;
|
|
|
448 hp->bh_page_count = page_count;
|
|
|
449 if (mf_read(mfp, hp) == FAIL) /* cannot read the block! */
|
|
|
450 {
|
|
|
451 mf_free_bhdr(hp);
|
|
|
452 return NULL;
|
|
|
453 }
|
|
|
454 }
|
|
|
455 else
|
|
|
456 {
|
|
|
457 mf_rem_used(mfp, hp); /* remove from list, insert in front below */
|
|
|
458 mf_rem_hash(mfp, hp);
|
|
|
459 }
|
|
|
460
|
|
|
461 hp->bh_flags |= BH_LOCKED;
|
|
|
462 mf_ins_used(mfp, hp); /* put in front of used list */
|
|
|
463 mf_ins_hash(mfp, hp); /* put in front of hash list */
|
|
|
464
|
|
|
465 return hp;
|
|
|
466 }
|
|
|
467
|
|
|
468 /*
|
|
|
469 * release the block *hp
|
|
|
470 *
|
|
|
471 * dirty: Block must be written to file later
|
|
|
472 * infile: Block should be in file (needed for recovery)
|
|
|
473 *
|
|
|
474 * no return value, function cannot fail
|
|
|
475 */
|
|
|
476 void
|
|
|
477 mf_put(mfp, hp, dirty, infile)
|
|
|
478 memfile_T *mfp;
|
|
|
479 bhdr_T *hp;
|
|
|
480 int dirty;
|
|
|
481 int infile;
|
|
|
482 {
|
|
|
483 int flags;
|
|
|
484
|
|
|
485 flags = hp->bh_flags;
|
|
|
486
|
|
|
487 if ((flags & BH_LOCKED) == 0)
|
|
|
488 EMSG(_("E293: block was not locked"));
|
|
|
489 flags &= ~BH_LOCKED;
|
|
|
490 if (dirty)
|
|
|
491 {
|
|
|
492 flags |= BH_DIRTY;
|
|
|
493 mfp->mf_dirty = TRUE;
|
|
|
494 }
|
|
|
495 hp->bh_flags = flags;
|
|
|
496 if (infile)
|
|
|
497 mf_trans_add(mfp, hp); /* may translate negative in positive nr */
|
|
|
498 }
|
|
|
499
|
|
|
500 /*
|
|
|
501 * block *hp is no longer in used, may put it in the free list of memfile *mfp
|
|
|
502 */
|
|
|
503 void
|
|
|
504 mf_free(mfp, hp)
|
|
|
505 memfile_T *mfp;
|
|
|
506 bhdr_T *hp;
|
|
|
507 {
|
|
|
508 vim_free(hp->bh_data); /* free the memory */
|
|
|
509 mf_rem_hash(mfp, hp); /* get *hp out of the hash list */
|
|
|
510 mf_rem_used(mfp, hp); /* get *hp out of the used list */
|
|
|
511 if (hp->bh_bnum < 0)
|
|
|
512 {
|
|
|
513 vim_free(hp); /* don't want negative numbers in free list */
|
|
|
514 mfp->mf_neg_count--;
|
|
|
515 }
|
|
|
516 else
|
|
|
517 mf_ins_free(mfp, hp); /* put *hp in the free list */
|
|
|
518 }
|
|
|
519
|
|
|
520 #if defined(__MORPHOS__)
|
|
|
521 /* function is missing in MorphOS libnix version */
|
|
|
522 extern unsigned long *__stdfiledes;
|
|
|
523
|
|
|
524 static unsigned long
|
|
|
525 fdtofh(int filedescriptor)
|
|
|
526 {
|
|
|
527 return __stdfiledes[filedescriptor];
|
|
|
528 }
|
|
|
529 #endif
|
|
|
530
|
|
|
531 /*
|
|
|
532 * Sync the memory file *mfp to disk.
|
|
|
533 * Flags:
|
|
|
534 * MFS_ALL If not given, blocks with negative numbers are not synced,
|
|
|
535 * even when they are dirty!
|
|
|
536 * MFS_STOP Stop syncing when a character becomes available, but sync at
|
|
|
537 * least one block.
|
|
|
538 * MFS_FLUSH Make sure buffers are flushed to disk, so they will survive a
|
|
|
539 * system crash.
|
|
|
540 * MFS_ZERO Only write block 0.
|
|
|
541 *
|
|
|
542 * Return FAIL for failure, OK otherwise
|
|
|
543 */
|
|
|
544 int
|
|
|
545 mf_sync(mfp, flags)
|
|
|
546 memfile_T *mfp;
|
|
|
547 int flags;
|
|
|
548 {
|
|
|
549 int status;
|
|
|
550 bhdr_T *hp;
|
|
|
551 #if defined(SYNC_DUP_CLOSE) && !defined(MSDOS)
|
|
|
552 int fd;
|
|
|
553 #endif
|
|
|
554 int got_int_save = got_int;
|
|
|
555
|
|
|
556 if (mfp->mf_fd < 0) /* there is no file, nothing to do */
|
|
|
557 {
|
|
|
558 mfp->mf_dirty = FALSE;
|
|
|
559 return FAIL;
|
|
|
560 }
|
|
|
561
|
|
|
562 /* Only a CTRL-C while writing will break us here, not one typed
|
|
|
563 * previously. */
|
|
|
564 got_int = FALSE;
|
|
|
565
|
|
|
566 /*
|
|
|
567 * sync from last to first (may reduce the probability of an inconsistent
|
|
|
568 * file) If a write fails, it is very likely caused by a full filesystem.
|
|
|
569 * Then we only try to write blocks within the existing file. If that also
|
|
|
570 * fails then we give up.
|
|
|
571 */
|
|
|
572 status = OK;
|
|
|
573 for (hp = mfp->mf_used_last; hp != NULL; hp = hp->bh_prev)
|
|
|
574 if (((flags & MFS_ALL) || hp->bh_bnum >= 0)
|
|
|
575 && (hp->bh_flags & BH_DIRTY)
|
|
|
576 && (status == OK || (hp->bh_bnum >= 0
|
|
|
577 && hp->bh_bnum < mfp->mf_infile_count)))
|
|
|
578 {
|
|
|
579 if ((flags & MFS_ZERO) && hp->bh_bnum != 0)
|
|
|
580 continue;
|
|
|
581 if (mf_write(mfp, hp) == FAIL)
|
|
|
582 {
|
|
|
583 if (status == FAIL) /* double error: quit syncing */
|
|
|
584 break;
|
|
|
585 status = FAIL;
|
|
|
586 }
|
|
|
587 if (flags & MFS_STOP)
|
|
|
588 {
|
|
|
589 /* Stop when char available now. */
|
|
|
590 if (ui_char_avail())
|
|
|
591 break;
|
|
|
592 }
|
|
|
593 else
|
|
|
594 ui_breakcheck();
|
|
|
595 if (got_int)
|
|
|
596 break;
|
|
|
597 }
|
|
|
598
|
|
|
599 /*
|
|
|
600 * If the whole list is flushed, the memfile is not dirty anymore.
|
|
|
601 * In case of an error this flag is also set, to avoid trying all the time.
|
|
|
602 */
|
|
|
603 if (hp == NULL || status == FAIL)
|
|
|
604 mfp->mf_dirty = FALSE;
|
|
|
605
|
|
|
606 if ((flags & MFS_FLUSH) && *p_sws != NUL)
|
|
|
607 {
|
|
|
608 #if defined(UNIX)
|
|
|
609 # ifdef HAVE_FSYNC
|
|
|
610 /*
|
|
|
611 * most Unixes have the very useful fsync() function, just what we need.
|
|
|
612 * However, with OS/2 and EMX it is also available, but there are
|
|
|
613 * reports of bad problems with it (a bug in HPFS.IFS).
|
|
|
614 * So we disable use of it here in case someone tries to be smart
|
|
|
615 * and changes os_os2_cfg.h... (even though there is no __EMX__ test
|
|
|
616 * in the #if, as __EMX__ does not have sync(); we hope for a timely
|
|
|
617 * sync from the system itself).
|
|
|
618 */
|
|
|
619 # if defined(__EMX__)
|
|
|
620 error "Dont use fsync with EMX! Read emxdoc.doc or emxfix01.doc for info."
|
|
|
621 # endif
|
|
|
622 if (STRCMP(p_sws, "fsync") == 0)
|
|
|
623 {
|
|
|
624 if (fsync(mfp->mf_fd))
|
|
|
625 status = FAIL;
|
|
|
626 }
|
|
|
627 else
|
|
|
628 # endif
|
|
|
629 /* OpenNT is strictly POSIX (Benzinger) */
|
|
|
630 /* Tandem/Himalaya NSK-OSS doesn't have sync() */
|
|
|
631 # if defined(__OPENNT) || defined(__TANDEM)
|
|
|
632 fflush(NULL);
|
|
|
633 # else
|
|
|
634 sync();
|
|
|
635 # endif
|
|
|
636 #endif
|
|
|
637 #ifdef VMS
|
|
|
638 if (STRCMP(p_sws, "fsync") == 0)
|
|
|
639 {
|
|
|
640 if (fsync(mfp->mf_fd))
|
|
|
641 status = FAIL;
|
|
|
642 }
|
|
|
643 #endif
|
|
|
644 #ifdef MSDOS
|
|
|
645 if (_dos_commit(mfp->mf_fd))
|
|
|
646 status = FAIL;
|
|
|
647 #else
|
|
|
648 # ifdef SYNC_DUP_CLOSE
|
|
|
649 /*
|
|
|
650 * Win32 is a bit more work: Duplicate the file handle and close it.
|
|
|
651 * This should flush the file to disk.
|
|
|
652 */
|
|
|
653 if ((fd = dup(mfp->mf_fd)) >= 0)
|
|
|
654 close(fd);
|
|
|
655 # endif
|
|
|
656 #endif
|
|
|
657 #ifdef AMIGA
|
|
|
658 # ifdef __AROS__
|
|
|
659 if (fsync(mfp->mf_fd) != 0)
|
|
|
660 status = FAIL;
|
|
|
661 # else
|
|
|
662 /*
|
|
|
663 * Flush() only exists for AmigaDos 2.0.
|
|
|
664 * For 1.3 it should be done with close() + open(), but then the risk
|
|
|
665 * is that the open() may fail and lose the file....
|
|
|
666 */
|
|
|
667 # ifdef FEAT_ARP
|
|
|
668 if (dos2)
|
|
|
669 # endif
|
|
|
670 # ifdef SASC
|
|
|
671 {
|
|
|
672 struct UFB *fp = chkufb(mfp->mf_fd);
|
|
|
673
|
|
|
674 if (fp != NULL)
|
|
|
675 Flush(fp->ufbfh);
|
|
|
676 }
|
|
|
677 # else
|
|
|
678 # if defined(_DCC) || defined(__GNUC__) || defined(__MORPHOS__)
|
|
|
679 {
|
|
|
680 # if defined(__GNUC__) && !defined(__MORPHOS__)
|
|
|
681 /* Have function (in libnix at least),
|
|
|
682 * but ain't got no prototype anywhere. */
|
|
|
683 extern unsigned long fdtofh(int filedescriptor);
|
|
|
684 # endif
|
|
|
685 BPTR fh = (BPTR)fdtofh(mfp->mf_fd);
|
|
|
686
|
|
|
687 if (fh != 0)
|
|
|
688 Flush(fh);
|
|
|
689 }
|
|
|
690 # else /* assume Manx */
|
|
|
691 Flush(_devtab[mfp->mf_fd].fd);
|
|
|
692 # endif
|
|
|
693 # endif
|
|
|
694 # endif
|
|
|
695 #endif /* AMIGA */
|
|
|
696 }
|
|
|
697
|
|
|
698 got_int |= got_int_save;
|
|
|
699
|
|
|
700 return status;
|
|
|
701 }
|
|
|
702
|
|
|
703 /*
|
|
|
704 * insert block *hp in front of hashlist of memfile *mfp
|
|
|
705 */
|
|
|
706 static void
|
|
|
707 mf_ins_hash(mfp, hp)
|
|
|
708 memfile_T *mfp;
|
|
|
709 bhdr_T *hp;
|
|
|
710 {
|
|
|
711 bhdr_T *hhp;
|
|
|
712 int hash;
|
|
|
713
|
|
|
714 hash = MEMHASH(hp->bh_bnum);
|
|
|
715 hhp = mfp->mf_hash[hash];
|
|
|
716 hp->bh_hash_next = hhp;
|
|
|
717 hp->bh_hash_prev = NULL;
|
|
|
718 if (hhp != NULL)
|
|
|
719 hhp->bh_hash_prev = hp;
|
|
|
720 mfp->mf_hash[hash] = hp;
|
|
|
721 }
|
|
|
722
|
|
|
723 /*
|
|
|
724 * remove block *hp from hashlist of memfile list *mfp
|
|
|
725 */
|
|
|
726 static void
|
|
|
727 mf_rem_hash(mfp, hp)
|
|
|
728 memfile_T *mfp;
|
|
|
729 bhdr_T *hp;
|
|
|
730 {
|
|
|
731 if (hp->bh_hash_prev == NULL)
|
|
|
732 mfp->mf_hash[MEMHASH(hp->bh_bnum)] = hp->bh_hash_next;
|
|
|
733 else
|
|
|
734 hp->bh_hash_prev->bh_hash_next = hp->bh_hash_next;
|
|
|
735
|
|
|
736 if (hp->bh_hash_next)
|
|
|
737 hp->bh_hash_next->bh_hash_prev = hp->bh_hash_prev;
|
|
|
738 }
|
|
|
739
|
|
|
740 /*
|
|
|
741 * look in hash lists of memfile *mfp for block header with number 'nr'
|
|
|
742 */
|
|
|
743 static bhdr_T *
|
|
|
744 mf_find_hash(mfp, nr)
|
|
|
745 memfile_T *mfp;
|
|
|
746 blocknr_T nr;
|
|
|
747 {
|
|
|
748 bhdr_T *hp;
|
|
|
749
|
|
|
750 for (hp = mfp->mf_hash[MEMHASH(nr)]; hp != NULL; hp = hp->bh_hash_next)
|
|
|
751 if (hp->bh_bnum == nr)
|
|
|
752 break;
|
|
|
753 return hp;
|
|
|
754 }
|
|
|
755
|
|
|
756 /*
|
|
|
757 * insert block *hp in front of used list of memfile *mfp
|
|
|
758 */
|
|
|
759 static void
|
|
|
760 mf_ins_used(mfp, hp)
|
|
|
761 memfile_T *mfp;
|
|
|
762 bhdr_T *hp;
|
|
|
763 {
|
|
|
764 hp->bh_next = mfp->mf_used_first;
|
|
|
765 mfp->mf_used_first = hp;
|
|
|
766 hp->bh_prev = NULL;
|
|
|
767 if (hp->bh_next == NULL) /* list was empty, adjust last pointer */
|
|
|
768 mfp->mf_used_last = hp;
|
|
|
769 else
|
|
|
770 hp->bh_next->bh_prev = hp;
|
|
|
771 mfp->mf_used_count += hp->bh_page_count;
|
|
|
772 total_mem_used += hp->bh_page_count * mfp->mf_page_size;
|
|
|
773 }
|
|
|
774
|
|
|
775 /*
|
|
|
776 * remove block *hp from used list of memfile *mfp
|
|
|
777 */
|
|
|
778 static void
|
|
|
779 mf_rem_used(mfp, hp)
|
|
|
780 memfile_T *mfp;
|
|
|
781 bhdr_T *hp;
|
|
|
782 {
|
|
|
783 if (hp->bh_next == NULL) /* last block in used list */
|
|
|
784 mfp->mf_used_last = hp->bh_prev;
|
|
|
785 else
|
|
|
786 hp->bh_next->bh_prev = hp->bh_prev;
|
|
|
787 if (hp->bh_prev == NULL) /* first block in used list */
|
|
|
788 mfp->mf_used_first = hp->bh_next;
|
|
|
789 else
|
|
|
790 hp->bh_prev->bh_next = hp->bh_next;
|
|
|
791 mfp->mf_used_count -= hp->bh_page_count;
|
|
|
792 total_mem_used -= hp->bh_page_count * mfp->mf_page_size;
|
|
|
793 }
|
|
|
794
|
|
|
795 /*
|
|
|
796 * Release the least recently used block from the used list if the number
|
|
|
797 * of used memory blocks gets to big.
|
|
|
798 *
|
|
|
799 * Return the block header to the caller, including the memory block, so
|
|
|
800 * it can be re-used. Make sure the page_count is right.
|
|
|
801 */
|
|
|
802 static bhdr_T *
|
|
|
803 mf_release(mfp, page_count)
|
|
|
804 memfile_T *mfp;
|
|
|
805 int page_count;
|
|
|
806 {
|
|
|
807 bhdr_T *hp;
|
|
|
808 int need_release;
|
|
|
809 buf_T *buf;
|
|
|
810
|
|
|
811 /* don't release while in mf_close_file() */
|
|
|
812 if (dont_release)
|
|
|
813 return NULL;
|
|
|
814
|
|
|
815 /*
|
|
|
816 * Need to release a block if the number of blocks for this memfile is
|
|
|
817 * higher than the maximum or total memory used is over 'maxmemtot'
|
|
|
818 */
|
|
|
819 need_release = ((mfp->mf_used_count >= mfp->mf_used_count_max)
|
|
|
820 || (total_mem_used >> 10) >= (long_u)p_mmt);
|
|
|
821
|
|
|
822 /*
|
|
|
823 * Try to create a swap file if the amount of memory used is getting too
|
|
|
824 * high.
|
|
|
825 */
|
|
|
826 if (mfp->mf_fd < 0 && need_release && p_uc)
|
|
|
827 {
|
|
|
828 /* find for which buffer this memfile is */
|
|
|
829 for (buf = firstbuf; buf != NULL; buf = buf->b_next)
|
|
|
830 if (buf->b_ml.ml_mfp == mfp)
|
|
|
831 break;
|
|
|
832 if (buf != NULL && buf->b_may_swap)
|
|
|
833 ml_open_file(buf);
|
|
|
834 }
|
|
|
835
|
|
|
836 /*
|
|
|
837 * don't release a block if
|
|
|
838 * there is no file for this memfile
|
|
|
839 * or
|
|
|
840 * the number of blocks for this memfile is lower than the maximum
|
|
|
841 * and
|
|
|
842 * total memory used is not up to 'maxmemtot'
|
|
|
843 */
|
|
|
844 if (mfp->mf_fd < 0 || !need_release)
|
|
|
845 return NULL;
|
|
|
846
|
|
|
847 for (hp = mfp->mf_used_last; hp != NULL; hp = hp->bh_prev)
|
|
|
848 if (!(hp->bh_flags & BH_LOCKED))
|
|
|
849 break;
|
|
|
850 if (hp == NULL) /* not a single one that can be released */
|
|
|
851 return NULL;
|
|
|
852
|
|
|
853 /*
|
|
|
854 * If the block is dirty, write it.
|
|
|
855 * If the write fails we don't free it.
|
|
|
856 */
|
|
|
857 if ((hp->bh_flags & BH_DIRTY) && mf_write(mfp, hp) == FAIL)
|
|
|
858 return NULL;
|
|
|
859
|
|
|
860 mf_rem_used(mfp, hp);
|
|
|
861 mf_rem_hash(mfp, hp);
|
|
|
862
|
|
|
863 /*
|
|
|
864 * If a bhdr_T is returned, make sure that the page_count of bh_data is
|
|
|
865 * right
|
|
|
866 */
|
|
|
867 if (hp->bh_page_count != page_count)
|
|
|
868 {
|
|
|
869 vim_free(hp->bh_data);
|
|
|
870 if ((hp->bh_data = alloc(mfp->mf_page_size * page_count)) == NULL)
|
|
|
871 {
|
|
|
872 vim_free(hp);
|
|
|
873 return NULL;
|
|
|
874 }
|
|
|
875 hp->bh_page_count = page_count;
|
|
|
876 }
|
|
|
877 return hp;
|
|
|
878 }
|
|
|
879
|
|
|
880 /*
|
|
|
881 * release as many blocks as possible
|
|
|
882 * Used in case of out of memory
|
|
|
883 *
|
|
|
884 * return TRUE if any memory was released
|
|
|
885 */
|
|
|
886 int
|
|
|
887 mf_release_all()
|
|
|
888 {
|
|
|
889 buf_T *buf;
|
|
|
890 memfile_T *mfp;
|
|
|
891 bhdr_T *hp;
|
|
|
892 int retval = FALSE;
|
|
|
893
|
|
|
894 for (buf = firstbuf; buf != NULL; buf = buf->b_next)
|
|
|
895 {
|
|
|
896 mfp = buf->b_ml.ml_mfp;
|
|
|
897 if (mfp != NULL)
|
|
|
898 {
|
|
|
899 /* If no swap file yet, may open one */
|
|
|
900 if (mfp->mf_fd < 0 && buf->b_may_swap)
|
|
|
901 ml_open_file(buf);
|
|
|
902
|
|
|
903 /* only if there is a swapfile */
|
|
|
904 if (mfp->mf_fd >= 0)
|
|
|
905 {
|
|
|
906 for (hp = mfp->mf_used_last; hp != NULL; )
|
|
|
907 {
|
|
|
908 if (!(hp->bh_flags & BH_LOCKED)
|
|
|
909 && (!(hp->bh_flags & BH_DIRTY)
|
|
|
910 || mf_write(mfp, hp) != FAIL))
|
|
|
911 {
|
|
|
912 mf_rem_used(mfp, hp);
|
|
|
913 mf_rem_hash(mfp, hp);
|
|
|
914 mf_free_bhdr(hp);
|
|
|
915 hp = mfp->mf_used_last; /* re-start, list was changed */
|
|
|
916 retval = TRUE;
|
|
|
917 }
|
|
|
918 else
|
|
|
919 hp = hp->bh_prev;
|
|
|
920 }
|
|
|
921 }
|
|
|
922 }
|
|
|
923 }
|
|
|
924 return retval;
|
|
|
925 }
|
|
|
926
|
|
|
927 /*
|
|
|
928 * Allocate a block header and a block of memory for it
|
|
|
929 */
|
|
|
930 static bhdr_T *
|
|
|
931 mf_alloc_bhdr(mfp, page_count)
|
|
|
932 memfile_T *mfp;
|
|
|
933 int page_count;
|
|
|
934 {
|
|
|
935 bhdr_T *hp;
|
|
|
936
|
|
|
937 if ((hp = (bhdr_T *)alloc((unsigned)sizeof(bhdr_T))) != NULL)
|
|
|
938 {
|
|
|
939 if ((hp->bh_data = (char_u *)alloc(mfp->mf_page_size * page_count))
|
|
|
940 == NULL)
|
|
|
941 {
|
|
|
942 vim_free(hp); /* not enough memory */
|
|
|
943 return NULL;
|
|
|
944 }
|
|
|
945 hp->bh_page_count = page_count;
|
|
|
946 }
|
|
|
947 return hp;
|
|
|
948 }
|
|
|
949
|
|
|
950 /*
|
|
|
951 * Free a block header and the block of memory for it
|
|
|
952 */
|
|
|
953 static void
|
|
|
954 mf_free_bhdr(hp)
|
|
|
955 bhdr_T *hp;
|
|
|
956 {
|
|
|
957 vim_free(hp->bh_data);
|
|
|
958 vim_free(hp);
|
|
|
959 }
|
|
|
960
|
|
|
961 /*
|
|
|
962 * insert entry *hp in the free list
|
|
|
963 */
|
|
|
964 static void
|
|
|
965 mf_ins_free(mfp, hp)
|
|
|
966 memfile_T *mfp;
|
|
|
967 bhdr_T *hp;
|
|
|
968 {
|
|
|
969 hp->bh_next = mfp->mf_free_first;
|
|
|
970 mfp->mf_free_first = hp;
|
|
|
971 }
|
|
|
972
|
|
|
973 /*
|
|
|
974 * remove the first entry from the free list and return a pointer to it
|
|
|
975 * Note: caller must check that mfp->mf_free_first is not NULL!
|
|
|
976 */
|
|
|
977 static bhdr_T *
|
|
|
978 mf_rem_free(mfp)
|
|
|
979 memfile_T *mfp;
|
|
|
980 {
|
|
|
981 bhdr_T *hp;
|
|
|
982
|
|
|
983 hp = mfp->mf_free_first;
|
|
|
984 mfp->mf_free_first = hp->bh_next;
|
|
|
985 return hp;
|
|
|
986 }
|
|
|
987
|
|
|
988 /*
|
|
|
989 * read a block from disk
|
|
|
990 *
|
|
|
991 * Return FAIL for failure, OK otherwise
|
|
|
992 */
|
|
|
993 static int
|
|
|
994 mf_read(mfp, hp)
|
|
|
995 memfile_T *mfp;
|
|
|
996 bhdr_T *hp;
|
|
|
997 {
|
|
|
998 off_t offset;
|
|
|
999 unsigned page_size;
|
|
|
1000 unsigned size;
|
|
|
1001
|
|
|
1002 if (mfp->mf_fd < 0) /* there is no file, can't read */
|
|
|
1003 return FAIL;
|
|
|
1004
|
|
|
1005 page_size = mfp->mf_page_size;
|
|
|
1006 offset = (off_t)page_size * hp->bh_bnum;
|
|
|
1007 size = page_size * hp->bh_page_count;
|
|
|
1008 if (lseek(mfp->mf_fd, offset, SEEK_SET) != offset)
|
|
|
1009 {
|
|
|
1010 EMSG(_("E294: Seek error in swap file read"));
|
|
|
1011 return FAIL;
|
|
|
1012 }
|
|
|
1013 if ((unsigned)vim_read(mfp->mf_fd, hp->bh_data, size) != size)
|
|
|
1014 {
|
|
|
1015 EMSG(_("E295: Read error in swap file"));
|
|
|
1016 return FAIL;
|
|
|
1017 }
|
|
|
1018 return OK;
|
|
|
1019 }
|
|
|
1020
|
|
|
1021 /*
|
|
|
1022 * write a block to disk
|
|
|
1023 *
|
|
|
1024 * Return FAIL for failure, OK otherwise
|
|
|
1025 */
|
|
|
1026 static int
|
|
|
1027 mf_write(mfp, hp)
|
|
|
1028 memfile_T *mfp;
|
|
|
1029 bhdr_T *hp;
|
|
|
1030 {
|
|
|
1031 off_t offset; /* offset in the file */
|
|
|
1032 blocknr_T nr; /* block nr which is being written */
|
|
|
1033 bhdr_T *hp2;
|
|
|
1034 unsigned page_size; /* number of bytes in a page */
|
|
|
1035 unsigned page_count; /* number of pages written */
|
|
|
1036 unsigned size; /* number of bytes written */
|
|
|
1037
|
|
|
1038 if (mfp->mf_fd < 0) /* there is no file, can't write */
|
|
|
1039 return FAIL;
|
|
|
1040
|
|
|
1041 if (hp->bh_bnum < 0) /* must assign file block number */
|
|
|
1042 if (mf_trans_add(mfp, hp) == FAIL)
|
|
|
1043 return FAIL;
|
|
|
1044
|
|
|
1045 page_size = mfp->mf_page_size;
|
|
|
1046
|
|
|
1047 /*
|
|
|
1048 * We don't want gaps in the file. Write the blocks in front of *hp
|
|
|
1049 * to extend the file.
|
|
|
1050 * If block 'mf_infile_count' is not in the hash list, it has been
|
|
|
1051 * freed. Fill the space in the file with data from the current block.
|
|
|
1052 */
|
|
|
1053 for (;;)
|
|
|
1054 {
|
|
|
1055 nr = hp->bh_bnum;
|
|
|
1056 if (nr > mfp->mf_infile_count) /* beyond end of file */
|
|
|
1057 {
|
|
|
1058 nr = mfp->mf_infile_count;
|
|
|
1059 hp2 = mf_find_hash(mfp, nr); /* NULL catched below */
|
|
|
1060 }
|
|
|
1061 else
|
|
|
1062 hp2 = hp;
|
|
|
1063
|
|
|
1064 offset = (off_t)page_size * nr;
|
|
|
1065 if (lseek(mfp->mf_fd, offset, SEEK_SET) != offset)
|
|
|
1066 {
|
|
|
1067 EMSG(_("E296: Seek error in swap file write"));
|
|
|
1068 return FAIL;
|
|
|
1069 }
|
|
|
1070 if (hp2 == NULL) /* freed block, fill with dummy data */
|
|
|
1071 page_count = 1;
|
|
|
1072 else
|
|
|
1073 page_count = hp2->bh_page_count;
|
|
|
1074 size = page_size * page_count;
|
|
|
1075 if ((unsigned)vim_write(mfp->mf_fd,
|
|
|
1076 (hp2 == NULL ? hp : hp2)->bh_data, size) != size)
|
|
|
1077 {
|
|
|
1078 /*
|
|
|
1079 * Avoid repeating the error message, this mostly happens when the
|
|
|
1080 * disk is full. We give the message again only after a succesful
|
|
|
1081 * write or when hitting a key. We keep on trying, in case some
|
|
|
1082 * space becomes available.
|
|
|
1083 */
|
|
|
1084 if (!did_swapwrite_msg)
|
|
|
1085 EMSG(_("E297: Write error in swap file"));
|
|
|
1086 did_swapwrite_msg = TRUE;
|
|
|
1087 return FAIL;
|
|
|
1088 }
|
|
|
1089 did_swapwrite_msg = FALSE;
|
|
|
1090 if (hp2 != NULL) /* written a non-dummy block */
|
|
|
1091 hp2->bh_flags &= ~BH_DIRTY;
|
|
|
1092 /* appended to the file */
|
|
|
1093 if (nr + (blocknr_T)page_count > mfp->mf_infile_count)
|
|
|
1094 mfp->mf_infile_count = nr + page_count;
|
|
|
1095 if (nr == hp->bh_bnum) /* written the desired block */
|
|
|
1096 break;
|
|
|
1097 }
|
|
|
1098 return OK;
|
|
|
1099 }
|
|
|
1100
|
|
|
1101 /*
|
|
|
1102 * Make block number for *hp positive and add it to the translation list
|
|
|
1103 *
|
|
|
1104 * Return FAIL for failure, OK otherwise
|
|
|
1105 */
|
|
|
1106 static int
|
|
|
1107 mf_trans_add(mfp, hp)
|
|
|
1108 memfile_T *mfp;
|
|
|
1109 bhdr_T *hp;
|
|
|
1110 {
|
|
|
1111 bhdr_T *freep;
|
|
|
1112 blocknr_T new_bnum;
|
|
|
1113 int hash;
|
|
|
1114 NR_TRANS *np;
|
|
|
1115 int page_count;
|
|
|
1116
|
|
|
1117 if (hp->bh_bnum >= 0) /* it's already positive */
|
|
|
1118 return OK;
|
|
|
1119
|
|
|
1120 if ((np = (NR_TRANS *)alloc((unsigned)sizeof(NR_TRANS))) == NULL)
|
|
|
1121 return FAIL;
|
|
|
1122
|
|
|
1123 /*
|
|
|
1124 * get a new number for the block.
|
|
|
1125 * If the first item in the free list has sufficient pages, use its number
|
|
|
1126 * Otherwise use mf_blocknr_max.
|
|
|
1127 */
|
|
|
1128 freep = mfp->mf_free_first;
|
|
|
1129 page_count = hp->bh_page_count;
|
|
|
1130 if (freep != NULL && freep->bh_page_count >= page_count)
|
|
|
1131 {
|
|
|
1132 new_bnum = freep->bh_bnum;
|
|
|
1133 /*
|
|
|
1134 * If the page count of the free block was larger, recude it.
|
|
|
1135 * If the page count matches, remove the block from the free list
|
|
|
1136 */
|
|
|
1137 if (freep->bh_page_count > page_count)
|
|
|
1138 {
|
|
|
1139 freep->bh_bnum += page_count;
|
|
|
1140 freep->bh_page_count -= page_count;
|
|
|
1141 }
|
|
|
1142 else
|
|
|
1143 {
|
|
|
1144 freep = mf_rem_free(mfp);
|
|
|
1145 vim_free(freep);
|
|
|
1146 }
|
|
|
1147 }
|
|
|
1148 else
|
|
|
1149 {
|
|
|
1150 new_bnum = mfp->mf_blocknr_max;
|
|
|
1151 mfp->mf_blocknr_max += page_count;
|
|
|
1152 }
|
|
|
1153
|
|
|
1154 np->nt_old_bnum = hp->bh_bnum; /* adjust number */
|
|
|
1155 np->nt_new_bnum = new_bnum;
|
|
|
1156
|
|
|
1157 mf_rem_hash(mfp, hp); /* remove from old hash list */
|
|
|
1158 hp->bh_bnum = new_bnum;
|
|
|
1159 mf_ins_hash(mfp, hp); /* insert in new hash list */
|
|
|
1160
|
|
|
1161 hash = MEMHASH(np->nt_old_bnum); /* insert in trans list */
|
|
|
1162 np->nt_next = mfp->mf_trans[hash];
|
|
|
1163 mfp->mf_trans[hash] = np;
|
|
|
1164 if (np->nt_next != NULL)
|
|
|
1165 np->nt_next->nt_prev = np;
|
|
|
1166 np->nt_prev = NULL;
|
|
|
1167
|
|
|
1168 return OK;
|
|
|
1169 }
|
|
|
1170
|
|
|
1171 /*
|
|
|
1172 * Lookup a tranlation from the trans lists and delete the entry
|
|
|
1173 *
|
|
|
1174 * Return the positive new number when found, the old number when not found
|
|
|
1175 */
|
|
|
1176 blocknr_T
|
|
|
1177 mf_trans_del(mfp, old_nr)
|
|
|
1178 memfile_T *mfp;
|
|
|
1179 blocknr_T old_nr;
|
|
|
1180 {
|
|
|
1181 int hash;
|
|
|
1182 NR_TRANS *np;
|
|
|
1183 blocknr_T new_bnum;
|
|
|
1184
|
|
|
1185 hash = MEMHASH(old_nr);
|
|
|
1186 for (np = mfp->mf_trans[hash]; np != NULL; np = np->nt_next)
|
|
|
1187 if (np->nt_old_bnum == old_nr)
|
|
|
1188 break;
|
|
|
1189 if (np == NULL) /* not found */
|
|
|
1190 return old_nr;
|
|
|
1191
|
|
|
1192 mfp->mf_neg_count--;
|
|
|
1193 new_bnum = np->nt_new_bnum;
|
|
|
1194 if (np->nt_prev != NULL) /* remove entry from the trans list */
|
|
|
1195 np->nt_prev->nt_next = np->nt_next;
|
|
|
1196 else
|
|
|
1197 mfp->mf_trans[hash] = np->nt_next;
|
|
|
1198 if (np->nt_next != NULL)
|
|
|
1199 np->nt_next->nt_prev = np->nt_prev;
|
|
|
1200 vim_free(np);
|
|
|
1201
|
|
|
1202 return new_bnum;
|
|
|
1203 }
|
|
|
1204
|
|
|
1205 /*
|
|
|
1206 * Set mfp->mf_ffname according to mfp->mf_fname and some other things.
|
|
|
1207 * Only called when creating or renaming the swapfile. Either way it's a new
|
|
|
1208 * name so we must work out the full path name.
|
|
|
1209 */
|
|
|
1210 void
|
|
|
1211 mf_set_ffname(mfp)
|
|
|
1212 memfile_T *mfp;
|
|
|
1213 {
|
|
|
1214 mfp->mf_ffname = FullName_save(mfp->mf_fname, FALSE);
|
|
|
1215 }
|
|
|
1216
|
|
|
1217 /*
|
|
|
1218 * Make the name of the file used for the memfile a full path.
|
|
|
1219 * Used before doing a :cd
|
|
|
1220 */
|
|
|
1221 void
|
|
|
1222 mf_fullname(mfp)
|
|
|
1223 memfile_T *mfp;
|
|
|
1224 {
|
|
|
1225 if (mfp != NULL && mfp->mf_fname != NULL && mfp->mf_ffname != NULL)
|
|
|
1226 {
|
|
|
1227 vim_free(mfp->mf_fname);
|
|
|
1228 mfp->mf_fname = mfp->mf_ffname;
|
|
|
1229 mfp->mf_ffname = NULL;
|
|
|
1230 }
|
|
|
1231 }
|
|
|
1232
|
|
|
1233 /*
|
|
|
1234 * return TRUE if there are any translations pending for 'mfp'
|
|
|
1235 */
|
|
|
1236 int
|
|
|
1237 mf_need_trans(mfp)
|
|
|
1238 memfile_T *mfp;
|
|
|
1239 {
|
|
|
1240 return (mfp->mf_fname != NULL && mfp->mf_neg_count > 0);
|
|
|
1241 }
|
|
|
1242
|
|
|
1243 /*
|
|
|
1244 * Open a swap file for a memfile.
|
|
|
1245 * The "fname" must be in allocated memory, and is consumed (also when an
|
|
|
1246 * error occurs).
|
|
|
1247 */
|
|
|
1248 static void
|
|
|
1249 mf_do_open(mfp, fname, flags)
|
|
|
1250 memfile_T *mfp;
|
|
|
1251 char_u *fname;
|
|
|
1252 int flags; /* flags for open() */
|
|
|
1253 {
|
|
|
1254 #ifdef HAVE_LSTAT
|
|
|
1255 struct stat sb;
|
|
|
1256 #endif
|
|
|
1257
|
|
|
1258 mfp->mf_fname = fname;
|
|
|
1259
|
|
|
1260 /*
|
|
|
1261 * Get the full path name before the open, because this is
|
|
|
1262 * not possible after the open on the Amiga.
|
|
|
1263 * fname cannot be NameBuff, because it must have been allocated.
|
|
|
1264 */
|
|
|
1265 mf_set_ffname(mfp);
|
|
|
1266 #if defined(MSDOS) || defined(MSWIN) || defined(RISCOS)
|
|
|
1267 /*
|
|
|
1268 * A ":!cd e:xxx" may change the directory without us knowning, use the
|
|
|
1269 * full pathname always. Careful: This frees fname!
|
|
|
1270 */
|
|
|
1271 mf_fullname(mfp);
|
|
|
1272 #endif
|
|
|
1273
|
|
|
1274 #ifdef HAVE_LSTAT
|
|
|
1275 /*
|
|
|
1276 * Extra security check: When creating a swap file it really shouldn't
|
|
|
1277 * exist yet. If there is a symbolic link, this is most likely an attack.
|
|
|
1278 */
|
|
|
1279 if ((flags & O_CREAT) && mch_lstat((char *)mfp->mf_fname, &sb) >= 0)
|
|
|
1280 {
|
|
|
1281 mfp->mf_fd = -1;
|
|
|
1282 EMSG(_("E300: Swap file already exists (symlink attack?)"));
|
|
|
1283 }
|
|
|
1284 else
|
|
|
1285 #endif
|
|
|
1286 {
|
|
|
1287 /*
|
|
|
1288 * try to open the file
|
|
|
1289 */
|
|
557
|
1290 flags |= O_EXTRA | O_NOFOLLOW;
|
|
7
|
1291 #ifdef WIN32
|
|
|
1292 /* Prevent handle inheritance that cause problems with Cscope
|
|
|
1293 * (swap file may not be deleted if cscope connection was open after
|
|
|
1294 * the file) */
|
|
|
1295 flags |= O_NOINHERIT;
|
|
|
1296 #endif
|
|
|
1297 mfp->mf_fd = mch_open_rw((char *)mfp->mf_fname, flags);
|
|
|
1298 }
|
|
|
1299
|
|
|
1300 /*
|
|
|
1301 * If the file cannot be opened, use memory only
|
|
|
1302 */
|
|
|
1303 if (mfp->mf_fd < 0)
|
|
|
1304 {
|
|
|
1305 vim_free(mfp->mf_fname);
|
|
|
1306 vim_free(mfp->mf_ffname);
|
|
|
1307 mfp->mf_fname = NULL;
|
|
|
1308 mfp->mf_ffname = NULL;
|
|
|
1309 }
|
|
|
1310 else
|
|
|
1311 mch_hide(mfp->mf_fname); /* try setting the 'hidden' flag */
|
|
|
1312 }
|
