Code

fast-import: don't allow 'ls' of path with empty components
[git.git] / builtin / patch-id.c
1 #include "cache.h"
2 #include "exec_cmd.h"
4 static void flush_current_id(int patchlen, unsigned char *id, git_SHA_CTX *c)
5 {
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);
16 }
18 static int remove_space(char *line)
19 {
20         char *src = line;
21         char *dst = line;
22         unsigned char c;
24         while ((c = *src++) != '\0') {
25                 if (!isspace(c))
26                         *dst++ = c;
27         }
28         return dst - line;
29 }
31 static int scan_hunk_header(const char *p, int *p_before, int *p_after)
32 {
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);
42         }
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);
51         }
52         if (n == 0)
53                 return 0;
55         *p_before = atoi(q);
56         *p_after = atoi(r);
57         return 1;
58 }
60 int get_one_patchid(unsigned char *next_sha1, git_SHA_CTX *ctx)
61 {
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;
77                 if (!get_sha1_hex(p, next_sha1)) {
78                         found_next = 1;
79                         break;
80                 }
82                 /* Ignore commit comments */
83                 if (!patchlen && memcmp(line, "diff ", 5))
84                         continue;
86                 /* Parsing diff header?  */
87                 if (before == -1) {
88                         if (!memcmp(line, "index ", 6))
89                                 continue;
90                         else if (!memcmp(line, "--- ", 4))
91                                 before = after = 1;
92                         else if (!isalpha(line[0]))
93                                 break;
94                 }
96                 /* Looking for a valid hunk header?  */
97                 if (before == 0 && after == 0) {
98                         if (!memcmp(line, "@@ -", 4)) {
99                                 /* Parse next hunk, but ignore line numbers.  */
100                                 scan_hunk_header(line, &before, &after);
101                                 continue;
102                         }
104                         /* Split at the end of the patch.  */
105                         if (memcmp(line, "diff ", 5))
106                                 break;
108                         /* Else we're parsing another header.  */
109                         before = after = -1;
110                 }
112                 /* If we get here, we're inside a hunk.  */
113                 if (line[0] == '-' || line[0] == ' ')
114                         before--;
115                 if (line[0] == '+' || line[0] == ' ')
116                         after--;
118                 /* Compute the sha without whitespace */
119                 len = remove_space(line);
120                 patchlen += len;
121                 git_SHA1_Update(ctx, line, len);
122         }
124         if (!found_next)
125                 hashclr(next_sha1);
127         return patchlen;
130 static void generate_id_list(void)
132         unsigned char sha1[20], n[20];
133         git_SHA_CTX ctx;
134         int patchlen;
136         git_SHA1_Init(&ctx);
137         hashclr(sha1);
138         while (!feof(stdin)) {
139                 patchlen = get_one_patchid(n, &ctx);
140                 flush_current_id(patchlen, sha1, &ctx);
141                 hashcpy(sha1, n);
142         }
145 static const char patch_id_usage[] = "git patch-id < patch";
147 int cmd_patch_id(int argc, const char **argv, const char *prefix)
149         if (argc != 1)
150                 usage(patch_id_usage);
152         generate_id_list();
153         return 0;