Merge branch 'sp/maint-fd-limit'
[git.git] / builtin / patch-id.c
blob49a0472a9bd28274c4be1352996e700a1db4b94a
1 #include "cache.h"
2 #include "exec_cmd.h"
4 static void flush_current_id(int patchlen, unsigned char *id, git_SHA_CTX *c)
6 unsigned char result[20];
7 char name[50];
9 if (!patchlen)
10 return;
12 git_SHA1_Final(result, c);
13 memcpy(name, sha1_to_hex(id), 41);
14 printf("%s %s\n", sha1_to_hex(result), name);
15 git_SHA1_Init(c);
18 static int remove_space(char *line)
20 char *src = line;
21 char *dst = line;
22 unsigned char c;
24 while ((c = *src++) != '\0') {
25 if (!isspace(c))
26 *dst++ = c;
28 return dst - line;
31 static int scan_hunk_header(const char *p, int *p_before, int *p_after)
33 static const char digits[] = "0123456789";
34 const char *q, *r;
35 int n;
37 q = p + 4;
38 n = strspn(q, digits);
39 if (q[n] == ',') {
40 q += n + 1;
41 n = strspn(q, digits);
43 if (n == 0 || q[n] != ' ' || q[n+1] != '+')
44 return 0;
46 r = q + n + 2;
47 n = strspn(r, digits);
48 if (r[n] == ',') {
49 r += n + 1;
50 n = strspn(r, digits);
52 if (n == 0)
53 return 0;
55 *p_before = atoi(q);
56 *p_after = atoi(r);
57 return 1;
60 int get_one_patchid(unsigned char *next_sha1, git_SHA_CTX *ctx)
62 static char line[1000];
63 int patchlen = 0, found_next = 0;
64 int before = -1, after = -1;
66 while (fgets(line, sizeof(line), stdin) != NULL) {
67 char *p = line;
68 int len;
70 if (!memcmp(line, "diff-tree ", 10))
71 p += 10;
72 else if (!memcmp(line, "commit ", 7))
73 p += 7;
74 else if (!memcmp(line, "From ", 5))
75 p += 5;
76 else if (!memcmp(line, "\\ ", 2) && 12 < strlen(line))
77 continue;
79 if (!get_sha1_hex(p, next_sha1)) {
80 found_next = 1;
81 break;
84 /* Ignore commit comments */
85 if (!patchlen && memcmp(line, "diff ", 5))
86 continue;
88 /* Parsing diff header? */
89 if (before == -1) {
90 if (!memcmp(line, "index ", 6))
91 continue;
92 else if (!memcmp(line, "--- ", 4))
93 before = after = 1;
94 else if (!isalpha(line[0]))
95 break;
98 /* Looking for a valid hunk header? */
99 if (before == 0 && after == 0) {
100 if (!memcmp(line, "@@ -", 4)) {
101 /* Parse next hunk, but ignore line numbers. */
102 scan_hunk_header(line, &before, &after);
103 continue;
106 /* Split at the end of the patch. */
107 if (memcmp(line, "diff ", 5))
108 break;
110 /* Else we're parsing another header. */
111 before = after = -1;
114 /* If we get here, we're inside a hunk. */
115 if (line[0] == '-' || line[0] == ' ')
116 before--;
117 if (line[0] == '+' || line[0] == ' ')
118 after--;
120 /* Compute the sha without whitespace */
121 len = remove_space(line);
122 patchlen += len;
123 git_SHA1_Update(ctx, line, len);
126 if (!found_next)
127 hashclr(next_sha1);
129 return patchlen;
132 static void generate_id_list(void)
134 unsigned char sha1[20], n[20];
135 git_SHA_CTX ctx;
136 int patchlen;
138 git_SHA1_Init(&ctx);
139 hashclr(sha1);
140 while (!feof(stdin)) {
141 patchlen = get_one_patchid(n, &ctx);
142 flush_current_id(patchlen, sha1, &ctx);
143 hashcpy(sha1, n);
147 static const char patch_id_usage[] = "git patch-id < patch";
149 int cmd_patch_id(int argc, const char **argv, const char *prefix)
151 if (argc != 1)
152 usage(patch_id_usage);
154 generate_id_list();
155 return 0;