xdiff-interface.c

   1 #include "cache.h"
   2 #include "xdiff-interface.h"
   3
   4 static void consume_one(void *priv_, char *s, unsigned long size)
   5 {
   6         struct xdiff_emit_state *priv = priv_;
   7         char *ep;
   8         while (size) {
   9                 unsigned long this_size;
  10                 ep = memchr(s, '\n', size);
  11                 this_size = (ep == NULL) ? size : (ep - s + 1);
  12                 priv->consume(priv, s, this_size);
  13                 size -= this_size;
  14                 s += this_size;
  15         }
  16 }
  17
  18 int xdiff_outf(void *priv_, mmbuffer_t *mb, int nbuf)
  19 {
  20         struct xdiff_emit_state *priv = priv_;
  21         int i;
  22
  23         for (i = 0; i < nbuf; i++) {
  24                 if (mb[i].ptr[mb[i].size-1] != '\n') {
  25                         /* Incomplete line */
  26                         priv->remainder = realloc(priv->remainder,
  27                                                   priv->remainder_size +
  28                                                   mb[i].size);
  29                         memcpy(priv->remainder + priv->remainder_size,
  30                                mb[i].ptr, mb[i].size);
  31                         priv->remainder_size += mb[i].size;
  32                         continue;
  33                 }
  34
  35                 /* we have a complete line */
  36                 if (!priv->remainder) {
  37                         consume_one(priv, mb[i].ptr, mb[i].size);
  38                         continue;
  39                 }
  40                 priv->remainder = realloc(priv->remainder,
  41                                           priv->remainder_size +
  42                                           mb[i].size);
  43                 memcpy(priv->remainder + priv->remainder_size,
  44                        mb[i].ptr, mb[i].size);
  45                 consume_one(priv, priv->remainder,
  46                             priv->remainder_size + mb[i].size);
  47                 free(priv->remainder);
  48                 priv->remainder = NULL;
  49                 priv->remainder_size = 0;
  50         }
  51         if (priv->remainder) {
  52                 consume_one(priv, priv->remainder, priv->remainder_size);
  53                 free(priv->remainder);
  54                 priv->remainder = NULL;
  55                 priv->remainder_size = 0;
  56         }
  57         return 0;
  58 }