blame: use built-in xdiff
[git/git.git] / xdiff-interface.c
CommitLineData
d9ea73e0
JH
1#include "cache.h"
2#include "xdiff-interface.h"
3
c1e335a4
JH
4static int parse_num(char **cp_p, unsigned int *num_p)
5{
6 char *cp = *cp_p;
7 unsigned 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 unsigned int *ob, unsigned int *on,
21 unsigned int *nb, unsigned 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
d9ea73e0
JH
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 = realloc(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 = realloc(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}