Make builtin-commit.c more careful about parenthood
[alt-git.git] / builtin-mailsplit.c
blob46b27cdaea71cba92974480da74ec5922fcf3a7a
1 /*
2 * Totally braindamaged mbox splitter program.
4 * It just splits a mbox into a list of files: "0001" "0002" ..
5 * so you can process them further from there.
6 */
7 #include "cache.h"
8 #include "builtin.h"
9 #include "path-list.h"
11 static const char git_mailsplit_usage[] =
12 "git-mailsplit [-d<prec>] [-f<n>] [-b] -o<directory> <mbox>|<Maildir>...";
14 static int is_from_line(const char *line, int len)
16 const char *colon;
18 if (len < 20 || memcmp("From ", line, 5))
19 return 0;
21 colon = line + len - 2;
22 line += 5;
23 for (;;) {
24 if (colon < line)
25 return 0;
26 if (*--colon == ':')
27 break;
30 if (!isdigit(colon[-4]) ||
31 !isdigit(colon[-2]) ||
32 !isdigit(colon[-1]) ||
33 !isdigit(colon[ 1]) ||
34 !isdigit(colon[ 2]))
35 return 0;
37 /* year */
38 if (strtol(colon+3, NULL, 10) <= 90)
39 return 0;
41 /* Ok, close enough */
42 return 1;
45 /* Could be as small as 64, enough to hold a Unix "From " line. */
46 static char buf[4096];
48 /* Called with the first line (potentially partial)
49 * already in buf[] -- normally that should begin with
50 * the Unix "From " line. Write it into the specified
51 * file.
53 static int split_one(FILE *mbox, const char *name, int allow_bare)
55 FILE *output = NULL;
56 int len = strlen(buf);
57 int fd;
58 int status = 0;
59 int is_bare = !is_from_line(buf, len);
61 if (is_bare && !allow_bare)
62 goto corrupt;
64 fd = open(name, O_WRONLY | O_CREAT | O_EXCL, 0666);
65 if (fd < 0)
66 die("cannot open output file %s", name);
67 output = fdopen(fd, "w");
69 /* Copy it out, while searching for a line that begins with
70 * "From " and having something that looks like a date format.
72 for (;;) {
73 int is_partial = (buf[len-1] != '\n');
75 if (fputs(buf, output) == EOF)
76 die("cannot write output");
78 if (fgets(buf, sizeof(buf), mbox) == NULL) {
79 if (feof(mbox)) {
80 status = 1;
81 break;
83 die("cannot read mbox");
85 len = strlen(buf);
86 if (!is_partial && !is_bare && is_from_line(buf, len))
87 break; /* done with one message */
89 fclose(output);
90 return status;
92 corrupt:
93 if (output)
94 fclose(output);
95 unlink(name);
96 fprintf(stderr, "corrupt mailbox\n");
97 exit(1);
100 static int populate_maildir_list(struct path_list *list, const char *path)
102 DIR *dir;
103 struct dirent *dent;
104 char name[PATH_MAX];
105 char *subs[] = { "cur", "new", NULL };
106 char **sub;
108 for (sub = subs; *sub; ++sub) {
109 snprintf(name, sizeof(name), "%s/%s", path, *sub);
110 if ((dir = opendir(name)) == NULL) {
111 if (errno == ENOENT)
112 continue;
113 error("cannot opendir %s (%s)", name, strerror(errno));
114 return -1;
117 while ((dent = readdir(dir)) != NULL) {
118 if (dent->d_name[0] == '.')
119 continue;
120 snprintf(name, sizeof(name), "%s/%s", *sub, dent->d_name);
121 path_list_insert(name, list);
124 closedir(dir);
127 return 0;
130 static int split_maildir(const char *maildir, const char *dir,
131 int nr_prec, int skip)
133 char file[PATH_MAX];
134 char name[PATH_MAX];
135 int ret = -1;
136 int i;
137 struct path_list list = {NULL, 0, 0, 1};
139 if (populate_maildir_list(&list, maildir) < 0)
140 goto out;
142 for (i = 0; i < list.nr; i++) {
143 FILE *f;
144 snprintf(file, sizeof(file), "%s/%s", maildir, list.items[i].path);
145 f = fopen(file, "r");
146 if (!f) {
147 error("cannot open mail %s (%s)", file, strerror(errno));
148 goto out;
151 if (fgets(buf, sizeof(buf), f) == NULL) {
152 error("cannot read mail %s (%s)", file, strerror(errno));
153 goto out;
156 sprintf(name, "%s/%0*d", dir, nr_prec, ++skip);
157 split_one(f, name, 1);
159 fclose(f);
162 ret = skip;
163 out:
164 path_list_clear(&list, 1);
165 return ret;
168 static int split_mbox(const char *file, const char *dir, int allow_bare,
169 int nr_prec, int skip)
171 char name[PATH_MAX];
172 int ret = -1;
173 int peek;
175 FILE *f = !strcmp(file, "-") ? stdin : fopen(file, "r");
176 int file_done = 0;
178 if (!f) {
179 error("cannot open mbox %s", file);
180 goto out;
183 do {
184 peek = fgetc(f);
185 } while (isspace(peek));
186 ungetc(peek, f);
188 if (fgets(buf, sizeof(buf), f) == NULL) {
189 /* empty stdin is OK */
190 if (f != stdin) {
191 error("cannot read mbox %s", file);
192 goto out;
194 file_done = 1;
197 while (!file_done) {
198 sprintf(name, "%s/%0*d", dir, nr_prec, ++skip);
199 file_done = split_one(f, name, allow_bare);
202 if (f != stdin)
203 fclose(f);
205 ret = skip;
206 out:
207 return ret;
210 int cmd_mailsplit(int argc, const char **argv, const char *prefix)
212 int nr = 0, nr_prec = 4, num = 0;
213 int allow_bare = 0;
214 const char *dir = NULL;
215 const char **argp;
216 static const char *stdin_only[] = { "-", NULL };
218 for (argp = argv+1; *argp; argp++) {
219 const char *arg = *argp;
221 if (arg[0] != '-')
222 break;
223 /* do flags here */
224 if ( arg[1] == 'd' ) {
225 nr_prec = strtol(arg+2, NULL, 10);
226 if (nr_prec < 3 || 10 <= nr_prec)
227 usage(git_mailsplit_usage);
228 continue;
229 } else if ( arg[1] == 'f' ) {
230 nr = strtol(arg+2, NULL, 10);
231 } else if ( arg[1] == 'b' && !arg[2] ) {
232 allow_bare = 1;
233 } else if ( arg[1] == 'o' && arg[2] ) {
234 dir = arg+2;
235 } else if ( arg[1] == '-' && !arg[2] ) {
236 argp++; /* -- marks end of options */
237 break;
238 } else {
239 die("unknown option: %s", arg);
243 if ( !dir ) {
244 /* Backwards compatibility: if no -o specified, accept
245 <mbox> <dir> or just <dir> */
246 switch (argc - (argp-argv)) {
247 case 1:
248 dir = argp[0];
249 argp = stdin_only;
250 break;
251 case 2:
252 stdin_only[0] = argp[0];
253 dir = argp[1];
254 argp = stdin_only;
255 break;
256 default:
257 usage(git_mailsplit_usage);
259 } else {
260 /* New usage: if no more argument, parse stdin */
261 if ( !*argp )
262 argp = stdin_only;
265 while (*argp) {
266 const char *arg = *argp++;
267 struct stat argstat;
268 int ret = 0;
270 if (arg[0] == '-' && arg[1] == 0) {
271 ret = split_mbox(arg, dir, allow_bare, nr_prec, nr);
272 if (ret < 0) {
273 error("cannot split patches from stdin");
274 return 1;
276 num += (ret - nr);
277 nr = ret;
278 continue;
281 if (stat(arg, &argstat) == -1) {
282 error("cannot stat %s (%s)", arg, strerror(errno));
283 return 1;
286 if (S_ISDIR(argstat.st_mode))
287 ret = split_maildir(arg, dir, nr_prec, nr);
288 else
289 ret = split_mbox(arg, dir, allow_bare, nr_prec, nr);
291 if (ret < 0) {
292 error("cannot split patches from %s", arg);
293 return 1;
295 num += (ret - nr);
296 nr = ret;
299 printf("%d\n", num);
301 return 0;