Mercurial > vim
annotate src/xdiff/xemit.c @ 14704:150274bc6f5c v8.1.0364
patch 8.1.0364: compiler warning in xdiff code
commit https://github.com/vim/vim/commit/e797abf3c75358ebc0b31d6e076972daf889e06e
Author: Bram Moolenaar <Bram@vim.org>
Date: Mon Sep 10 21:22:15 2018 +0200
patch 8.1.0364: compiler warning in xdiff code
Problem: Compiler warning in xdiff code. (Yegappan Lakshmanan)
Solution: Initialize directly.
author | Christian Brabandt <cb@256bit.org> |
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date | Mon, 10 Sep 2018 21:30:07 +0200 |
parents | 195e8b1fcbbf |
children | 0e336b7d2090 |
rev | line source |
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14696
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1 /* |
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2 * LibXDiff by Davide Libenzi ( File Differential Library ) |
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3 * Copyright (C) 2003 Davide Libenzi |
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4 * |
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5 * This library is free software; you can redistribute it and/or |
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6 * modify it under the terms of the GNU Lesser General Public |
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7 * License as published by the Free Software Foundation; either |
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8 * version 2.1 of the License, or (at your option) any later version. |
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9 * |
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10 * This library is distributed in the hope that it will be useful, |
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 * Lesser General Public License for more details. |
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14 * |
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15 * You should have received a copy of the GNU Lesser General Public |
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16 * License along with this library; if not, see |
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17 * <http://www.gnu.org/licenses/>. |
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18 * |
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19 * Davide Libenzi <davidel@xmailserver.org> |
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20 * |
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21 */ |
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22 |
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23 #include "xinclude.h" |
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24 |
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25 static long xdl_get_rec(xdfile_t *xdf, long ri, char const **rec) { |
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26 |
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27 *rec = xdf->recs[ri]->ptr; |
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28 |
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29 return xdf->recs[ri]->size; |
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30 } |
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31 |
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32 |
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33 static int xdl_emit_record(xdfile_t *xdf, long ri, char const *pre, xdemitcb_t *ecb) { |
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34 long size, psize = strlen(pre); |
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35 char const *rec; |
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36 |
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37 size = xdl_get_rec(xdf, ri, &rec); |
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38 if (xdl_emit_diffrec(rec, size, pre, psize, ecb) < 0) { |
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39 |
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40 return -1; |
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41 } |
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42 |
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43 return 0; |
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44 } |
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45 |
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46 |
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47 /* |
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48 * Starting at the passed change atom, find the latest change atom to be included |
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49 * inside the differential hunk according to the specified configuration. |
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50 * Also advance xscr if the first changes must be discarded. |
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51 */ |
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52 xdchange_t *xdl_get_hunk(xdchange_t **xscr, xdemitconf_t const *xecfg) |
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53 { |
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54 xdchange_t *xch, *xchp, *lxch; |
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55 long max_common = 2 * xecfg->ctxlen + xecfg->interhunkctxlen; |
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56 long max_ignorable = xecfg->ctxlen; |
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57 unsigned long ignored = 0; /* number of ignored blank lines */ |
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58 |
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59 /* remove ignorable changes that are too far before other changes */ |
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60 for (xchp = *xscr; xchp && xchp->ignore; xchp = xchp->next) { |
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61 xch = xchp->next; |
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62 |
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63 if (xch == NULL || |
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64 xch->i1 - (xchp->i1 + xchp->chg1) >= max_ignorable) |
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65 *xscr = xch; |
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66 } |
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67 |
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68 if (*xscr == NULL) |
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69 return NULL; |
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70 |
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71 lxch = *xscr; |
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72 |
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73 for (xchp = *xscr, xch = xchp->next; xch; xchp = xch, xch = xch->next) { |
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74 long distance = xch->i1 - (xchp->i1 + xchp->chg1); |
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75 if (distance > max_common) |
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76 break; |
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77 |
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78 if (distance < max_ignorable && (!xch->ignore || lxch == xchp)) { |
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79 lxch = xch; |
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80 ignored = 0; |
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81 } else if (distance < max_ignorable && xch->ignore) { |
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82 ignored += xch->chg2; |
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83 } else if (lxch != xchp && |
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84 xch->i1 + (long)ignored - (lxch->i1 + lxch->chg1) > max_common) { |
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85 break; |
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86 } else if (!xch->ignore) { |
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87 lxch = xch; |
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88 ignored = 0; |
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89 } else { |
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90 ignored += xch->chg2; |
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91 } |
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92 } |
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93 |
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94 return lxch; |
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95 } |
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96 |
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97 |
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98 static long def_ff(const char *rec, long len, char *buf, long sz, void *priv UNUSED) |
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99 { |
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100 if (len > 0 && |
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101 (isalpha((unsigned char)*rec) || /* identifier? */ |
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102 *rec == '_' || /* also identifier? */ |
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103 *rec == '$')) { /* identifiers from VMS and other esoterico */ |
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104 if (len > sz) |
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105 len = sz; |
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106 while (0 < len && isspace((unsigned char)rec[len - 1])) |
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107 len--; |
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108 memcpy(buf, rec, len); |
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109 return len; |
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110 } |
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111 return -1; |
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112 } |
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113 |
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114 static long match_func_rec(xdfile_t *xdf, xdemitconf_t const *xecfg, long ri, |
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115 char *buf, long sz) |
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116 { |
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117 const char *rec; |
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118 long len = xdl_get_rec(xdf, ri, &rec); |
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119 if (!xecfg->find_func) |
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120 return def_ff(rec, len, buf, sz, xecfg->find_func_priv); |
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121 return xecfg->find_func(rec, len, buf, sz, xecfg->find_func_priv); |
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122 } |
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123 |
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124 static int is_func_rec(xdfile_t *xdf, xdemitconf_t const *xecfg, long ri) |
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125 { |
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126 char dummy[1]; |
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127 return match_func_rec(xdf, xecfg, ri, dummy, sizeof(dummy)) >= 0; |
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128 } |
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129 |
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130 struct func_line { |
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131 long len; |
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132 char buf[80]; |
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133 }; |
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134 |
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135 static long get_func_line(xdfenv_t *xe, xdemitconf_t const *xecfg, |
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136 struct func_line *func_line, long start, long limit) |
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137 { |
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138 long l, size, step = (start > limit) ? -1 : 1; |
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139 char *buf, dummy[1]; |
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140 |
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141 buf = func_line ? func_line->buf : dummy; |
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142 size = func_line ? sizeof(func_line->buf) : sizeof(dummy); |
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143 |
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144 for (l = start; l != limit && 0 <= l && l < xe->xdf1.nrec; l += step) { |
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145 long len = match_func_rec(&xe->xdf1, xecfg, l, buf, size); |
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146 if (len >= 0) { |
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147 if (func_line) |
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148 func_line->len = len; |
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149 return l; |
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150 } |
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151 } |
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152 return -1; |
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153 } |
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154 |
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155 static int is_empty_rec(xdfile_t *xdf, long ri) |
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156 { |
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157 const char *rec; |
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158 long len = xdl_get_rec(xdf, ri, &rec); |
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159 |
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160 while (len > 0 && XDL_ISSPACE(*rec)) { |
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161 rec++; |
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162 len--; |
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163 } |
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164 return !len; |
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165 } |
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166 |
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167 int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb, |
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168 xdemitconf_t const *xecfg) { |
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169 long s1, s2, e1, e2, lctx; |
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170 xdchange_t *xch, *xche; |
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171 long funclineprev = -1; |
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172 struct func_line func_line; |
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173 |
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174 func_line.len = 0; |
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175 |
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176 for (xch = xscr; xch; xch = xche->next) { |
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177 xche = xdl_get_hunk(&xch, xecfg); |
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178 if (!xch) |
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179 break; |
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180 |
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181 s1 = XDL_MAX(xch->i1 - xecfg->ctxlen, 0); |
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182 s2 = XDL_MAX(xch->i2 - xecfg->ctxlen, 0); |
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183 |
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184 if (xecfg->flags & XDL_EMIT_FUNCCONTEXT) { |
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185 long fs1, i1 = xch->i1; |
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186 |
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187 /* Appended chunk? */ |
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188 if (i1 >= xe->xdf1.nrec) { |
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189 long i2 = xch->i2; |
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190 |
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191 /* |
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192 * We don't need additional context if |
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193 * a whole function was added. |
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194 */ |
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195 while (i2 < xe->xdf2.nrec) { |
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196 if (is_func_rec(&xe->xdf2, xecfg, i2)) |
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197 goto post_context_calculation; |
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198 i2++; |
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199 } |
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200 |
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201 /* |
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202 * Otherwise get more context from the |
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203 * pre-image. |
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204 */ |
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205 i1 = xe->xdf1.nrec - 1; |
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206 } |
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207 |
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208 fs1 = get_func_line(xe, xecfg, NULL, i1, -1); |
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209 while (fs1 > 0 && !is_empty_rec(&xe->xdf1, fs1 - 1) && |
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210 !is_func_rec(&xe->xdf1, xecfg, fs1 - 1)) |
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211 fs1--; |
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212 if (fs1 < 0) |
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213 fs1 = 0; |
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214 if (fs1 < s1) { |
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215 s2 -= s1 - fs1; |
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216 s1 = fs1; |
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217 } |
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218 } |
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219 |
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220 post_context_calculation: |
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221 lctx = xecfg->ctxlen; |
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222 lctx = XDL_MIN(lctx, xe->xdf1.nrec - (xche->i1 + xche->chg1)); |
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223 lctx = XDL_MIN(lctx, xe->xdf2.nrec - (xche->i2 + xche->chg2)); |
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224 |
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225 e1 = xche->i1 + xche->chg1 + lctx; |
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226 e2 = xche->i2 + xche->chg2 + lctx; |
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227 |
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228 if (xecfg->flags & XDL_EMIT_FUNCCONTEXT) { |
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229 long fe1 = get_func_line(xe, xecfg, NULL, |
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230 xche->i1 + xche->chg1, |
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231 xe->xdf1.nrec); |
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232 while (fe1 > 0 && is_empty_rec(&xe->xdf1, fe1 - 1)) |
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233 fe1--; |
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234 if (fe1 < 0) |
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235 fe1 = xe->xdf1.nrec; |
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236 if (fe1 > e1) { |
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237 e2 += fe1 - e1; |
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238 e1 = fe1; |
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239 } |
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240 |
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241 /* |
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242 * Overlap with next change? Then include it |
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243 * in the current hunk and start over to find |
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244 * its new end. |
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245 */ |
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246 if (xche->next) { |
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247 long l = XDL_MIN(xche->next->i1, |
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248 xe->xdf1.nrec - 1); |
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249 if (l - xecfg->ctxlen <= e1 || |
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250 get_func_line(xe, xecfg, NULL, l, e1) < 0) { |
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251 xche = xche->next; |
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252 goto post_context_calculation; |
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253 } |
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254 } |
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255 } |
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256 |
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257 /* |
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258 * Emit current hunk header. |
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259 */ |
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260 |
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261 if (xecfg->flags & XDL_EMIT_FUNCNAMES) { |
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262 get_func_line(xe, xecfg, &func_line, |
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263 s1 - 1, funclineprev); |
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264 funclineprev = s1 - 1; |
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265 } |
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266 if (xdl_emit_hunk_hdr(s1 + 1, e1 - s1, s2 + 1, e2 - s2, |
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267 func_line.buf, func_line.len, ecb) < 0) |
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268 return -1; |
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269 |
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270 /* |
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271 * Emit pre-context. |
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272 */ |
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273 for (; s2 < xch->i2; s2++) |
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274 if (xdl_emit_record(&xe->xdf2, s2, " ", ecb) < 0) |
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275 return -1; |
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276 |
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277 for (s1 = xch->i1, s2 = xch->i2;; xch = xch->next) { |
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278 /* |
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279 * Merge previous with current change atom. |
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280 */ |
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281 for (; s1 < xch->i1 && s2 < xch->i2; s1++, s2++) |
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282 if (xdl_emit_record(&xe->xdf2, s2, " ", ecb) < 0) |
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283 return -1; |
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284 |
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285 /* |
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286 * Removes lines from the first file. |
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287 */ |
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288 for (s1 = xch->i1; s1 < xch->i1 + xch->chg1; s1++) |
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289 if (xdl_emit_record(&xe->xdf1, s1, "-", ecb) < 0) |
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290 return -1; |
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291 |
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292 /* |
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293 * Adds lines from the second file. |
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294 */ |
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295 for (s2 = xch->i2; s2 < xch->i2 + xch->chg2; s2++) |
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296 if (xdl_emit_record(&xe->xdf2, s2, "+", ecb) < 0) |
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297 return -1; |
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298 |
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299 if (xch == xche) |
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300 break; |
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301 s1 = xch->i1 + xch->chg1; |
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302 s2 = xch->i2 + xch->chg2; |
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303 } |
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304 |
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305 /* |
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306 * Emit post-context. |
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307 */ |
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308 for (s2 = xche->i2 + xche->chg2; s2 < e2; s2++) |
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309 if (xdl_emit_record(&xe->xdf2, s2, " ", ecb) < 0) |
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310 return -1; |
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311 } |
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312 |
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313 return 0; |
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314 } |