Convert the index file reading/writing to use network byte order.
[git/git.git] / show-diff.c
1 /*
2 * GIT - The information manager from hell
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 */
6 #include "cache.h"
7
8 static void show_differences(char *name,
9 void *old_contents, unsigned long long old_size)
10 {
11 static char cmd[1000];
12 FILE *f;
13
14 snprintf(cmd, sizeof(cmd), "diff -L %s -u -N - %s", name, name);
15 f = popen(cmd, "w");
16 if (old_size)
17 fwrite(old_contents, old_size, 1, f);
18 pclose(f);
19 }
20
21 static void show_diff_empty(struct cache_entry *ce)
22 {
23 char *old;
24 unsigned long int size;
25 int lines=0;
26 unsigned char type[20], *p, *end;
27
28 old = read_sha1_file(ce->sha1, type, &size);
29 if (size > 0) {
30 int startline = 1;
31 int c = 0;
32
33 printf("--- %s\n", ce->name);
34 printf("+++ /dev/null\n");
35 p = old;
36 end = old + size;
37 while (p < end)
38 if (*p++ == '\n')
39 lines ++;
40 printf("@@ -1,%d +0,0 @@\n", lines);
41 p = old;
42 while (p < end) {
43 c = *p++;
44 if (startline) {
45 putchar('-');
46 startline = 0;
47 }
48 putchar(c);
49 if (c == '\n')
50 startline = 1;
51 }
52 if (c!='\n')
53 printf("\n");
54 fflush(stdout);
55 }
56 }
57
58 int main(int argc, char **argv)
59 {
60 int silent = 0;
61 int entries = read_cache();
62 int i;
63
64 while (argc-- > 1) {
65 if (!strcmp(argv[1], "-s")) {
66 silent = 1;
67 continue;
68 }
69 usage("show-diff [-s]");
70 }
71
72 if (entries < 0) {
73 perror("read_cache");
74 exit(1);
75 }
76 for (i = 0; i < entries; i++) {
77 struct stat st;
78 struct cache_entry *ce = active_cache[i];
79 int n, changed;
80 unsigned long size;
81 char type[20];
82 void *new;
83
84 if (stat(ce->name, &st) < 0) {
85 printf("%s: %s\n", ce->name, strerror(errno));
86 if (errno == ENOENT && !silent)
87 show_diff_empty(ce);
88 continue;
89 }
90 changed = cache_match_stat(ce, &st);
91 if (!changed)
92 continue;
93 printf("%.*s: ", ce_namelen(ce), ce->name);
94 for (n = 0; n < 20; n++)
95 printf("%02x", ce->sha1[n]);
96 printf("\n");
97 fflush(stdout);
98 if (silent)
99 continue;
100
101 new = read_sha1_file(ce->sha1, type, &size);
102 show_differences(ce->name, new, size);
103 free(new);
104 }
105 return 0;
106 }