[PATCH] Fix a crash when doing rev-tree
[git/git.git] / show-diff.c
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8bc9a0c7
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1/*
2 * GIT - The information manager from hell
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 */
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6#include "cache.h"
7
c0fb976a 8static void show_differences(char *name,
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9 void *old_contents, unsigned long long old_size)
10{
11 static char cmd[1000];
12 FILE *f;
13
c0fb976a 14 snprintf(cmd, sizeof(cmd), "diff -L %s -u -N - %s", name, name);
e83c5163 15 f = popen(cmd, "w");
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16 if (old_size)
17 fwrite(old_contents, old_size, 1, f);
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18 pclose(f);
19}
20
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21static 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("+++ %s\n", ce->name);
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
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58int main(int argc, char **argv)
59{
60 int entries = read_cache();
61 int i;
62
63 if (entries < 0) {
64 perror("read_cache");
65 exit(1);
66 }
67 for (i = 0; i < entries; i++) {
68 struct stat st;
69 struct cache_entry *ce = active_cache[i];
70 int n, changed;
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71 unsigned long size;
72 char type[20];
73 void *new;
74
75 if (stat(ce->name, &st) < 0) {
76 printf("%s: %s\n", ce->name, strerror(errno));
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77 if (errno == ENOENT)
78 show_diff_empty(ce);
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79 continue;
80 }
734aab75 81 changed = cache_match_stat(ce, &st);
5e76011c 82 if (!changed)
e83c5163 83 continue;
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84 printf("%.*s: ", ce->namelen, ce->name);
85 for (n = 0; n < 20; n++)
86 printf("%02x", ce->sha1[n]);
87 printf("\n");
c0fb976a 88 fflush(stdout);
e83c5163 89 new = read_sha1_file(ce->sha1, type, &size);
c0fb976a 90 show_differences(ce->name, new, size);
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91 free(new);
92 }
93 return 0;
94}