Andrew's git - gitweb.git/blob

   1#include "cache.h"
   2#include "xdiff-interface.h"
   3
   4static int parse_num(char **cp_p, int *num_p)
   5{
   6        char *cp = *cp_p;
   7        int num = 0;
   8        int read_some;
   9
  10        while ('0' <= *cp && *cp <= '9')
  11                num = num * 10 + *cp++ - '0';
  12        if (!(read_some = cp - *cp_p))
  13                return -1;
  14        *cp_p = cp;
  15        *num_p = num;
  16        return 0;
  17}
  18
  19int parse_hunk_header(char *line, int len,
  20                      int *ob, int *on,
  21                      int *nb, int *nn)
  22{
  23        char *cp;
  24        cp = line + 4;
  25        if (parse_num(&cp, ob)) {
  26        bad_line:
  27                return error("malformed diff output: %s", line);
  28        }
  29        if (*cp == ',') {
  30                cp++;
  31                if (parse_num(&cp, on))
  32                        goto bad_line;
  33        }
  34        else
  35                *on = 1;
  36        if (*cp++ != ' ' || *cp++ != '+')
  37                goto bad_line;
  38        if (parse_num(&cp, nb))
  39                goto bad_line;
  40        if (*cp == ',') {
  41                cp++;
  42                if (parse_num(&cp, nn))
  43                        goto bad_line;
  44        }
  45        else
  46                *nn = 1;
  47        return -!!memcmp(cp, " @@", 3);
  48}
  49
  50static void consume_one(void *priv_, char *s, unsigned long size)
  51{
  52        struct xdiff_emit_state *priv = priv_;
  53        char *ep;
  54        while (size) {
  55                unsigned long this_size;
  56                ep = memchr(s, '\n', size);
  57                this_size = (ep == NULL) ? size : (ep - s + 1);
  58                priv->consume(priv, s, this_size);
  59                size -= this_size;
  60                s += this_size;
  61        }
  62}
  63
  64int xdiff_outf(void *priv_, mmbuffer_t *mb, int nbuf)
  65{
  66        struct xdiff_emit_state *priv = priv_;
  67        int i;
  68
  69        for (i = 0; i < nbuf; i++) {
  70                if (mb[i].ptr[mb[i].size-1] != '\n') {
  71                        /* Incomplete line */
  72                        priv->remainder = xrealloc(priv->remainder,
  73                                                   priv->remainder_size +
  74                                                   mb[i].size);
  75                        memcpy(priv->remainder + priv->remainder_size,
  76                               mb[i].ptr, mb[i].size);
  77                        priv->remainder_size += mb[i].size;
  78                        continue;
  79                }
  80
  81                /* we have a complete line */
  82                if (!priv->remainder) {
  83                        consume_one(priv, mb[i].ptr, mb[i].size);
  84                        continue;
  85                }
  86                priv->remainder = xrealloc(priv->remainder,
  87                                           priv->remainder_size +
  88                                           mb[i].size);
  89                memcpy(priv->remainder + priv->remainder_size,
  90                       mb[i].ptr, mb[i].size);
  91                consume_one(priv, priv->remainder,
  92                            priv->remainder_size + mb[i].size);
  93                free(priv->remainder);
  94                priv->remainder = NULL;
  95                priv->remainder_size = 0;
  96        }
  97        if (priv->remainder) {
  98                consume_one(priv, priv->remainder, priv->remainder_size);
  99                free(priv->remainder);
 100                priv->remainder = NULL;
 101                priv->remainder_size = 0;
 102        }
 103        return 0;
 104}
 105
 106int read_mmfile(mmfile_t *ptr, const char *filename)
 107{
 108        struct stat st;
 109        FILE *f;
 110        size_t sz;
 111
 112        if (stat(filename, &st))
 113                return error("Could not stat %s", filename);
 114        if ((f = fopen(filename, "rb")) == NULL)
 115                return error("Could not open %s", filename);
 116        sz = xsize_t(st.st_size);
 117        ptr->ptr = xmalloc(sz);
 118        if (fread(ptr->ptr, sz, 1, f) != 1)
 119                return error("Could not read %s", filename);
 120        fclose(f);
 121        ptr->size = sz;
 122        return 0;
 123}
 124
 125#define FIRST_FEW_BYTES 8000
 126int buffer_is_binary(const char *ptr, unsigned long size)
 127{
 128        if (FIRST_FEW_BYTES < size)
 129                size = FIRST_FEW_BYTES;
 130        return !!memchr(ptr, 0, size);
 131}