annotate mercurial/bdiff.c @ 23172:e955549cd045

tests: write hgrc of more than two lines by using shell heredoc Here document should be readable than repeating echo commands.
author Yuya Nishihara <yuya@tcha.org>
date Tue, 04 Nov 2014 23:41:46 +0900
parents 66b21ce60a19
children e868d8ee7c8f
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1 /*
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2 bdiff.c - efficient binary diff extension for Mercurial
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3
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345bac2bc4ec update copyrights.
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4 Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>
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5
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6 This software may be used and distributed according to the terms of
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7 the GNU General Public License, incorporated herein by reference.
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8
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9 Based roughly on Python difflib
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10 */
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11
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12 #define PY_SSIZE_T_CLEAN
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13 #include <Python.h>
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14 #include <stdlib.h>
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15 #include <string.h>
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16 #include <limits.h>
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17
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18 #include "util.h"
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19
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20 struct line {
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21 int hash, n, e;
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22 Py_ssize_t len;
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23 const char *l;
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24 };
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25
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26 struct pos {
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27 int pos, len;
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28 };
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29
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30 struct hunk;
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31 struct hunk {
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32 int a1, a2, b1, b2;
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33 struct hunk *next;
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34 };
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35
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36 static int splitlines(const char *a, Py_ssize_t len, struct line **lr)
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37 {
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38 unsigned hash;
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39 int i;
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40 const char *p, *b = a;
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41 const char * const plast = a + len - 1;
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42 struct line *l;
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43
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44 /* count the lines */
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45 i = 1; /* extra line for sentinel */
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46 for (p = a; p < a + len; p++)
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47 if (*p == '\n' || p == plast)
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48 i++;
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49
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50 *lr = l = (struct line *)malloc(sizeof(struct line) * i);
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51 if (!l)
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52 return -1;
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53
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54 /* build the line array and calculate hashes */
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55 hash = 0;
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56 for (p = a; p < a + len; p++) {
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57 /* Leonid Yuriev's hash */
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58 hash = (hash * 1664525) + (unsigned char)*p + 1013904223;
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59
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60 if (*p == '\n' || p == plast) {
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61 l->hash = hash;
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62 hash = 0;
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63 l->len = p - b + 1;
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64 l->l = b;
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65 l->n = INT_MAX;
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66 l++;
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67 b = p + 1;
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68 }
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69 }
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70
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71 /* set up a sentinel */
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72 l->hash = 0;
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73 l->len = 0;
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74 l->l = a + len;
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75 return i - 1;
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76 }
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77
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78 static inline int cmp(struct line *a, struct line *b)
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79 {
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80 return a->hash != b->hash || a->len != b->len || memcmp(a->l, b->l, a->len);
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81 }
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82
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83 static int equatelines(struct line *a, int an, struct line *b, int bn)
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84 {
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85 int i, j, buckets = 1, t, scale;
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86 struct pos *h = NULL;
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87
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88 /* build a hash table of the next highest power of 2 */
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89 while (buckets < bn + 1)
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90 buckets *= 2;
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91
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92 /* try to allocate a large hash table to avoid collisions */
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93 for (scale = 4; scale; scale /= 2) {
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94 h = (struct pos *)malloc(scale * buckets * sizeof(struct pos));
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95 if (h)
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96 break;
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97 }
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98
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99 if (!h)
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100 return 0;
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101
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102 buckets = buckets * scale - 1;
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103
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104 /* clear the hash table */
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105 for (i = 0; i <= buckets; i++) {
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106 h[i].pos = INT_MAX;
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107 h[i].len = 0;
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108 }
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109
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110 /* add lines to the hash table chains */
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111 for (i = bn - 1; i >= 0; i--) {
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112 /* find the equivalence class */
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113 for (j = b[i].hash & buckets; h[j].pos != INT_MAX;
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114 j = (j + 1) & buckets)
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115 if (!cmp(b + i, b + h[j].pos))
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116 break;
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117
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118 /* add to the head of the equivalence class */
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119 b[i].n = h[j].pos;
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120 b[i].e = j;
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121 h[j].pos = i;
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122 h[j].len++; /* keep track of popularity */
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123 }
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124
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125 /* compute popularity threshold */
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126 t = (bn >= 31000) ? bn / 1000 : 1000000 / (bn + 1);
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127
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128 /* match items in a to their equivalence class in b */
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129 for (i = 0; i < an; i++) {
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130 /* find the equivalence class */
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131 for (j = a[i].hash & buckets; h[j].pos != INT_MAX;
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132 j = (j + 1) & buckets)
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133 if (!cmp(a + i, b + h[j].pos))
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134 break;
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135
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136 a[i].e = j; /* use equivalence class for quick compare */
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137 if (h[j].len <= t)
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138 a[i].n = h[j].pos; /* point to head of match list */
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139 else
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140 a[i].n = INT_MAX; /* too popular */
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141 }
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142
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143 /* discard hash tables */
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144 free(h);
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145 return 1;
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146 }
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147
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148 static int longest_match(struct line *a, struct line *b, struct pos *pos,
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149 int a1, int a2, int b1, int b2, int *omi, int *omj)
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150 {
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151 int mi = a1, mj = b1, mk = 0, mb = 0, i, j, k;
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152
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153 for (i = a1; i < a2; i++) {
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154 /* skip things before the current block */
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155 for (j = a[i].n; j < b1; j = b[j].n)
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156 ;
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157
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158 /* loop through all lines match a[i] in b */
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159 for (; j < b2; j = b[j].n) {
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160 /* does this extend an earlier match? */
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161 if (i > a1 && j > b1 && pos[j - 1].pos == i - 1)
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162 k = pos[j - 1].len + 1;
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163 else
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164 k = 1;
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165 pos[j].pos = i;
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166 pos[j].len = k;
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167
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168 /* best match so far? */
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169 if (k > mk) {
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170 mi = i;
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171 mj = j;
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172 mk = k;
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173 }
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174 }
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175 }
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176
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177 if (mk) {
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178 mi = mi - mk + 1;
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179 mj = mj - mk + 1;
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180 }
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181
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182 /* expand match to include neighboring popular lines */
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183 while (mi - mb > a1 && mj - mb > b1 &&
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184 a[mi - mb - 1].e == b[mj - mb - 1].e)
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185 mb++;
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186 while (mi + mk < a2 && mj + mk < b2 &&
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187 a[mi + mk].e == b[mj + mk].e)
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188 mk++;
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189
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190 *omi = mi - mb;
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191 *omj = mj - mb;
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192
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193 return mk + mb;
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194 }
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195
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196 static struct hunk *recurse(struct line *a, struct line *b, struct pos *pos,
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197 int a1, int a2, int b1, int b2, struct hunk *l)
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198 {
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199 int i, j, k;
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200
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201 while (1) {
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202 /* find the longest match in this chunk */
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203 k = longest_match(a, b, pos, a1, a2, b1, b2, &i, &j);
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204 if (!k)
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205 return l;
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206
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207 /* and recurse on the remaining chunks on either side */
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208 l = recurse(a, b, pos, a1, i, b1, j, l);
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209 if (!l)
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210 return NULL;
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211
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212 l->next = (struct hunk *)malloc(sizeof(struct hunk));
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213 if (!l->next)
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214 return NULL;
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215
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216 l = l->next;
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217 l->a1 = i;
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218 l->a2 = i + k;
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219 l->b1 = j;
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220 l->b2 = j + k;
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221 l->next = NULL;
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222
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223 /* tail-recursion didn't happen, so do equivalent iteration */
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224 a1 = i + k;
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225 b1 = j + k;
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226 }
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227 }
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228
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229 static int diff(struct line *a, int an, struct line *b, int bn,
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230 struct hunk *base)
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231 {
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232 struct hunk *curr;
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233 struct pos *pos;
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234 int t, count = 0;
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235
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236 /* allocate and fill arrays */
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237 t = equatelines(a, an, b, bn);
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238 pos = (struct pos *)calloc(bn ? bn : 1, sizeof(struct pos));
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239
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240 if (pos && t) {
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241 /* generate the matching block list */
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242
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243 curr = recurse(a, b, pos, 0, an, 0, bn, base);
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244 if (!curr)
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245 return -1;
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246
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247 /* sentinel end hunk */
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248 curr->next = (struct hunk *)malloc(sizeof(struct hunk));
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249 if (!curr->next)
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250 return -1;
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251 curr = curr->next;
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252 curr->a1 = curr->a2 = an;
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253 curr->b1 = curr->b2 = bn;
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254 curr->next = NULL;
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255 }
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256
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257 free(pos);
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258
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259 /* normalize the hunk list, try to push each hunk towards the end */
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260 for (curr = base->next; curr; curr = curr->next) {
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261 struct hunk *next = curr->next;
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262 int shift = 0;
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263
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264 if (!next)
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265 break;
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266
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267 if (curr->a2 == next->a1)
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268 while (curr->a2 + shift < an && curr->b2 + shift < bn
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269 && !cmp(a + curr->a2 + shift,
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270 b + curr->b2 + shift))
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271 shift++;
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272 else if (curr->b2 == next->b1)
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273 while (curr->b2 + shift < bn && curr->a2 + shift < an
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274 && !cmp(b + curr->b2 + shift,
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275 a + curr->a2 + shift))
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276 shift++;
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277 if (!shift)
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278 continue;
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279 curr->b2 += shift;
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280 next->b1 += shift;
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281 curr->a2 += shift;
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282 next->a1 += shift;
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283 }
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284
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285 for (curr = base->next; curr; curr = curr->next)
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286 count++;
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287 return count;
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288 }
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289
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diff changeset
290 static void freehunks(struct hunk *l)
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291 {
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diff changeset
292 struct hunk *n;
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diff changeset
293 for (; l; l = n) {
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294 n = l->next;
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295 free(l);
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296 }
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297 }
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298
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299 static PyObject *blocks(PyObject *self, PyObject *args)
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300 {
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301 PyObject *sa, *sb, *rl = NULL, *m;
433
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diff changeset
302 struct line *a, *b;
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diff changeset
303 struct hunk l, *h;
faee0ffbc24b bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents: 11364
diff changeset
304 int an, bn, count, pos = 0;
400
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
305
19962
66b21ce60a19 bdiff: avoid a memory error on malloc failure
Matt Mackall <mpm@selenic.com>
parents: 18551
diff changeset
306 l.next = NULL;
66b21ce60a19 bdiff: avoid a memory error on malloc failure
Matt Mackall <mpm@selenic.com>
parents: 18551
diff changeset
307
400
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
308 if (!PyArg_ParseTuple(args, "SS:bdiff", &sa, &sb))
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
309 return NULL;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
310
11364
0044193a1c45 bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents: 10500
diff changeset
311 an = splitlines(PyBytes_AsString(sa), PyBytes_Size(sa), &a);
0044193a1c45 bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents: 10500
diff changeset
312 bn = splitlines(PyBytes_AsString(sb), PyBytes_Size(sb), &b);
0044193a1c45 bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents: 10500
diff changeset
313
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
314 if (!a || !b)
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
315 goto nomem;
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
316
13089
faee0ffbc24b bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents: 11364
diff changeset
317 count = diff(a, an, b, bn, &l);
faee0ffbc24b bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents: 11364
diff changeset
318 if (count < 0)
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
319 goto nomem;
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
320
13089
faee0ffbc24b bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents: 11364
diff changeset
321 rl = PyList_New(count);
faee0ffbc24b bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents: 11364
diff changeset
322 if (!rl)
faee0ffbc24b bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents: 11364
diff changeset
323 goto nomem;
faee0ffbc24b bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents: 11364
diff changeset
324
faee0ffbc24b bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents: 11364
diff changeset
325 for (h = l.next; h; h = h->next) {
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
326 m = Py_BuildValue("iiii", h->a1, h->a2, h->b1, h->b2);
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
327 PyList_SetItem(rl, pos, m);
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
328 pos++;
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
329 }
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
330
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
331 nomem:
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
332 free(a);
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
333 free(b);
13089
faee0ffbc24b bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents: 11364
diff changeset
334 freehunks(l.next);
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
335 return rl ? rl : PyErr_NoMemory();
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
336 }
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
337
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
338 static PyObject *bdiff(PyObject *self, PyObject *args)
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
339 {
15222
73015301db86 bdiff: fix pointer aliasing
Matt Mackall <mpm@selenic.com>
parents: 13732
diff changeset
340 char *sa, *sb, *rb;
3335
9061613c1593 Teach bdiff to support buffer objects
Brendan Cully <brendan@kublai.com>
parents: 2859
diff changeset
341 PyObject *result = NULL;
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
342 struct line *al, *bl;
13089
faee0ffbc24b bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents: 11364
diff changeset
343 struct hunk l, *h;
16749
eab8ca175262 bdiff: use Py_ssize_t instead of int
Adrian Buehlmann <adrian@cadifra.com>
parents: 16477
diff changeset
344 int an, bn, count;
eab8ca175262 bdiff: use Py_ssize_t instead of int
Adrian Buehlmann <adrian@cadifra.com>
parents: 16477
diff changeset
345 Py_ssize_t len = 0, la, lb;
16477
70b5e25f1598 bdiff.bdiff: release the GIL before doing expensive diff operations
Augie Fackler <raf@durin42.com>
parents: 16437
diff changeset
346 PyThreadState *_save;
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
347
19962
66b21ce60a19 bdiff: avoid a memory error on malloc failure
Matt Mackall <mpm@selenic.com>
parents: 18551
diff changeset
348 l.next = NULL;
66b21ce60a19 bdiff: avoid a memory error on malloc failure
Matt Mackall <mpm@selenic.com>
parents: 18551
diff changeset
349
3369
4bad632913d8 python2.5 PyArg_ParseTuple fix
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 3335
diff changeset
350 if (!PyArg_ParseTuple(args, "s#s#:bdiff", &sa, &la, &sb, &lb))
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
351 return NULL;
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
352
18551
d6fb7bbec16a bdiff: simplify overflow checks
Matt Mackall <mpm@selenic.com>
parents: 16750
diff changeset
353 if (la > UINT_MAX || lb > UINT_MAX) {
d6fb7bbec16a bdiff: simplify overflow checks
Matt Mackall <mpm@selenic.com>
parents: 16750
diff changeset
354 PyErr_SetString(PyExc_ValueError, "bdiff inputs too large");
d6fb7bbec16a bdiff: simplify overflow checks
Matt Mackall <mpm@selenic.com>
parents: 16750
diff changeset
355 return NULL;
d6fb7bbec16a bdiff: simplify overflow checks
Matt Mackall <mpm@selenic.com>
parents: 16750
diff changeset
356 }
d6fb7bbec16a bdiff: simplify overflow checks
Matt Mackall <mpm@selenic.com>
parents: 16750
diff changeset
357
16477
70b5e25f1598 bdiff.bdiff: release the GIL before doing expensive diff operations
Augie Fackler <raf@durin42.com>
parents: 16437
diff changeset
358 _save = PyEval_SaveThread();
3335
9061613c1593 Teach bdiff to support buffer objects
Brendan Cully <brendan@kublai.com>
parents: 2859
diff changeset
359 an = splitlines(sa, la, &al);
9061613c1593 Teach bdiff to support buffer objects
Brendan Cully <brendan@kublai.com>
parents: 2859
diff changeset
360 bn = splitlines(sb, lb, &bl);
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
361 if (!al || !bl)
400
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
362 goto nomem;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
363
13089
faee0ffbc24b bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents: 11364
diff changeset
364 count = diff(al, an, bl, bn, &l);
faee0ffbc24b bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents: 11364
diff changeset
365 if (count < 0)
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
366 goto nomem;
400
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
367
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
368 /* calculate length of output */
3335
9061613c1593 Teach bdiff to support buffer objects
Brendan Cully <brendan@kublai.com>
parents: 2859
diff changeset
369 la = lb = 0;
13089
faee0ffbc24b bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents: 11364
diff changeset
370 for (h = l.next; h; h = h->next) {
400
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
371 if (h->a1 != la || h->b1 != lb)
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
372 len += 12 + bl[h->b1].l - bl[lb].l;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
373 la = h->a2;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
374 lb = h->b2;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
375 }
16477
70b5e25f1598 bdiff.bdiff: release the GIL before doing expensive diff operations
Augie Fackler <raf@durin42.com>
parents: 16437
diff changeset
376 PyEval_RestoreThread(_save);
70b5e25f1598 bdiff.bdiff: release the GIL before doing expensive diff operations
Augie Fackler <raf@durin42.com>
parents: 16437
diff changeset
377 _save = NULL;
400
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
378
11364
0044193a1c45 bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents: 10500
diff changeset
379 result = PyBytes_FromStringAndSize(NULL, len);
0044193a1c45 bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents: 10500
diff changeset
380
400
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
381 if (!result)
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
382 goto nomem;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
383
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
384 /* build binary patch */
11364
0044193a1c45 bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents: 10500
diff changeset
385 rb = PyBytes_AsString(result);
400
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
386 la = lb = 0;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
387
13089
faee0ffbc24b bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents: 11364
diff changeset
388 for (h = l.next; h; h = h->next) {
400
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
389 if (h->a1 != la || h->b1 != lb) {
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
390 len = bl[h->b1].l - bl[lb].l;
18551
d6fb7bbec16a bdiff: simplify overflow checks
Matt Mackall <mpm@selenic.com>
parents: 16750
diff changeset
391 putbe32((uint32_t)(al[la].l - al->l), rb);
d6fb7bbec16a bdiff: simplify overflow checks
Matt Mackall <mpm@selenic.com>
parents: 16750
diff changeset
392 putbe32((uint32_t)(al[h->a1].l - al->l), rb + 4);
d6fb7bbec16a bdiff: simplify overflow checks
Matt Mackall <mpm@selenic.com>
parents: 16750
diff changeset
393 putbe32((uint32_t)len, rb + 8);
400
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
394 memcpy(rb + 12, bl[lb].l, len);
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
395 rb += 12 + len;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
396 }
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
397 la = h->a2;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
398 lb = h->b2;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
399 }
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
400
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
401 nomem:
16477
70b5e25f1598 bdiff.bdiff: release the GIL before doing expensive diff operations
Augie Fackler <raf@durin42.com>
parents: 16437
diff changeset
402 if (_save)
70b5e25f1598 bdiff.bdiff: release the GIL before doing expensive diff operations
Augie Fackler <raf@durin42.com>
parents: 16437
diff changeset
403 PyEval_RestoreThread(_save);
400
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
404 free(al);
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
405 free(bl);
13089
faee0ffbc24b bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents: 11364
diff changeset
406 freehunks(l.next);
400
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
407 return result ? result : PyErr_NoMemory();
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
408 }
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
409
15530
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
410 /*
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
411 * If allws != 0, remove all whitespace (' ', \t and \r). Otherwise,
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
412 * reduce whitespace sequences to a single space and trim remaining whitespace
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
413 * from end of lines.
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
414 */
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
415 static PyObject *fixws(PyObject *self, PyObject *args)
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
416 {
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
417 PyObject *s, *result = NULL;
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
418 char allws, c;
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
419 const char *r;
16749
eab8ca175262 bdiff: use Py_ssize_t instead of int
Adrian Buehlmann <adrian@cadifra.com>
parents: 16477
diff changeset
420 Py_ssize_t i, rlen, wlen = 0;
15530
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
421 char *w;
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
422
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
423 if (!PyArg_ParseTuple(args, "Sb:fixws", &s, &allws))
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
424 return NULL;
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
425 r = PyBytes_AsString(s);
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
426 rlen = PyBytes_Size(s);
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
427
16071
8134ec8627e7 bdiff: fix malloc(0) issue in fixws()
Jim Hague <jim.hague@acm.org>
parents: 15530
diff changeset
428 w = (char *)malloc(rlen ? rlen : 1);
15530
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
429 if (!w)
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
430 goto nomem;
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
431
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
432 for (i = 0; i != rlen; i++) {
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
433 c = r[i];
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
434 if (c == ' ' || c == '\t' || c == '\r') {
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
435 if (!allws && (wlen == 0 || w[wlen - 1] != ' '))
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
436 w[wlen++] = ' ';
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
437 } else if (c == '\n' && !allws
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
438 && wlen > 0 && w[wlen - 1] == ' ') {
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
439 w[wlen - 1] = '\n';
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
440 } else {
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
441 w[wlen++] = c;
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
442 }
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
443 }
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
444
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
445 result = PyBytes_FromStringAndSize(w, wlen);
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
446
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
447 nomem:
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
448 free(w);
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
449 return result ? result : PyErr_NoMemory();
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
450 }
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
diff changeset
451
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
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452
400
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mpm@selenic.com
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453 static char mdiff_doc[] = "Efficient binary diff.";
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mpm@selenic.com
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454
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
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455 static PyMethodDef methods[] = {
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
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456 {"bdiff", bdiff, METH_VARARGS, "calculate a binary diff\n"},
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
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457 {"blocks", blocks, METH_VARARGS, "find a list of matching lines\n"},
15530
eeac5e179243 mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents: 15222
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458 {"fixws", fixws, METH_VARARGS, "normalize diff whitespaces\n"},
400
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459 {NULL, NULL}
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mpm@selenic.com
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460 };
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461
11364
0044193a1c45 bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents: 10500
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462 #ifdef IS_PY3K
0044193a1c45 bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents: 10500
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463 static struct PyModuleDef bdiff_module = {
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Renato Cunha <renatoc@gmail.com>
parents: 10500
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464 PyModuleDef_HEAD_INIT,
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Renato Cunha <renatoc@gmail.com>
parents: 10500
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465 "bdiff",
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Renato Cunha <renatoc@gmail.com>
parents: 10500
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466 mdiff_doc,
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Renato Cunha <renatoc@gmail.com>
parents: 10500
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467 -1,
0044193a1c45 bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents: 10500
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468 methods
0044193a1c45 bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents: 10500
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469 };
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Renato Cunha <renatoc@gmail.com>
parents: 10500
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470
0044193a1c45 bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents: 10500
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471 PyMODINIT_FUNC PyInit_bdiff(void)
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Renato Cunha <renatoc@gmail.com>
parents: 10500
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472 {
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Renato Cunha <renatoc@gmail.com>
parents: 10500
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473 return PyModule_Create(&bdiff_module);
0044193a1c45 bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents: 10500
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474 }
0044193a1c45 bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents: 10500
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475 #else
400
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476 PyMODINIT_FUNC initbdiff(void)
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mpm@selenic.com
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477 {
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478 Py_InitModule3("bdiff", methods, mdiff_doc);
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479 }
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0044193a1c45 bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents: 10500
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480 #endif
1542
8e80eefb3de6 made C src formatting more consistent
twaldmann@thinkmo.de
parents: 1397
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481