d288fde2c2cef606a60507a7a56b81352ab5d06e
1 /*
2 * Totally braindamaged mbox splitter program.
3 *
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 "string-list.h"
10 #include "strbuf.h"
12 static const char git_mailsplit_usage[] =
13 "git mailsplit [-d<prec>] [-f<n>] [-b] -o<directory> [<mbox>|<Maildir>...]";
15 static int is_from_line(const char *line, int len)
16 {
17 const char *colon;
19 if (len < 20 || memcmp("From ", line, 5))
20 return 0;
22 colon = line + len - 2;
23 line += 5;
24 for (;;) {
25 if (colon < line)
26 return 0;
27 if (*--colon == ':')
28 break;
29 }
31 if (!isdigit(colon[-4]) ||
32 !isdigit(colon[-2]) ||
33 !isdigit(colon[-1]) ||
34 !isdigit(colon[ 1]) ||
35 !isdigit(colon[ 2]))
36 return 0;
38 /* year */
39 if (strtol(colon+3, NULL, 10) <= 90)
40 return 0;
42 /* Ok, close enough */
43 return 1;
44 }
46 static struct strbuf buf = STRBUF_INIT;
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.
52 */
53 static int split_one(FILE *mbox, const char *name, int allow_bare)
54 {
55 FILE *output = NULL;
56 int fd;
57 int status = 0;
58 int is_bare = !is_from_line(buf.buf, buf.len);
60 if (is_bare && !allow_bare)
61 goto corrupt;
63 fd = open(name, O_WRONLY | O_CREAT | O_EXCL, 0666);
64 if (fd < 0)
65 die_errno("cannot open output file '%s'", name);
66 output = fdopen(fd, "w");
68 /* Copy it out, while searching for a line that begins with
69 * "From " and having something that looks like a date format.
70 */
71 for (;;) {
72 if (fwrite(buf.buf, 1, buf.len, output) != buf.len)
73 die_errno("cannot write output");
75 if (strbuf_getwholeline(&buf, mbox, '\n')) {
76 if (feof(mbox)) {
77 status = 1;
78 break;
79 }
80 die_errno("cannot read mbox");
81 }
82 if (!is_bare && is_from_line(buf.buf, buf.len))
83 break; /* done with one message */
84 }
85 fclose(output);
86 return status;
88 corrupt:
89 if (output)
90 fclose(output);
91 unlink(name);
92 fprintf(stderr, "corrupt mailbox\n");
93 exit(1);
94 }
96 static int populate_maildir_list(struct string_list *list, const char *path)
97 {
98 DIR *dir;
99 struct dirent *dent;
100 char name[PATH_MAX];
101 char *subs[] = { "cur", "new", NULL };
102 char **sub;
104 for (sub = subs; *sub; ++sub) {
105 snprintf(name, sizeof(name), "%s/%s", path, *sub);
106 if ((dir = opendir(name)) == NULL) {
107 if (errno == ENOENT)
108 continue;
109 error("cannot opendir %s (%s)", name, strerror(errno));
110 return -1;
111 }
113 while ((dent = readdir(dir)) != NULL) {
114 if (dent->d_name[0] == '.')
115 continue;
116 snprintf(name, sizeof(name), "%s/%s", *sub, dent->d_name);
117 string_list_insert(name, list);
118 }
120 closedir(dir);
121 }
123 return 0;
124 }
126 static int split_maildir(const char *maildir, const char *dir,
127 int nr_prec, int skip)
128 {
129 char file[PATH_MAX];
130 char name[PATH_MAX];
131 int ret = -1;
132 int i;
133 struct string_list list = {NULL, 0, 0, 1};
135 if (populate_maildir_list(&list, maildir) < 0)
136 goto out;
138 for (i = 0; i < list.nr; i++) {
139 FILE *f;
140 snprintf(file, sizeof(file), "%s/%s", maildir, list.items[i].string);
141 f = fopen(file, "r");
142 if (!f) {
143 error("cannot open mail %s (%s)", file, strerror(errno));
144 goto out;
145 }
147 if (strbuf_getwholeline(&buf, f, '\n')) {
148 error("cannot read mail %s (%s)", file, strerror(errno));
149 goto out;
150 }
152 sprintf(name, "%s/%0*d", dir, nr_prec, ++skip);
153 split_one(f, name, 1);
155 fclose(f);
156 }
158 ret = skip;
159 out:
160 string_list_clear(&list, 1);
161 return ret;
162 }
164 static int split_mbox(const char *file, const char *dir, int allow_bare,
165 int nr_prec, int skip)
166 {
167 char name[PATH_MAX];
168 int ret = -1;
169 int peek;
171 FILE *f = !strcmp(file, "-") ? stdin : fopen(file, "r");
172 int file_done = 0;
174 if (!f) {
175 error("cannot open mbox %s", file);
176 goto out;
177 }
179 do {
180 peek = fgetc(f);
181 } while (isspace(peek));
182 ungetc(peek, f);
184 if (strbuf_getwholeline(&buf, f, '\n')) {
185 /* empty stdin is OK */
186 if (f != stdin) {
187 error("cannot read mbox %s", file);
188 goto out;
189 }
190 file_done = 1;
191 }
193 while (!file_done) {
194 sprintf(name, "%s/%0*d", dir, nr_prec, ++skip);
195 file_done = split_one(f, name, allow_bare);
196 }
198 if (f != stdin)
199 fclose(f);
201 ret = skip;
202 out:
203 return ret;
204 }
206 int cmd_mailsplit(int argc, const char **argv, const char *prefix)
207 {
208 int nr = 0, nr_prec = 4, num = 0;
209 int allow_bare = 0;
210 const char *dir = NULL;
211 const char **argp;
212 static const char *stdin_only[] = { "-", NULL };
214 for (argp = argv+1; *argp; argp++) {
215 const char *arg = *argp;
217 if (arg[0] != '-')
218 break;
219 /* do flags here */
220 if ( arg[1] == 'd' ) {
221 nr_prec = strtol(arg+2, NULL, 10);
222 if (nr_prec < 3 || 10 <= nr_prec)
223 usage(git_mailsplit_usage);
224 continue;
225 } else if ( arg[1] == 'f' ) {
226 nr = strtol(arg+2, NULL, 10);
227 } else if ( arg[1] == 'b' && !arg[2] ) {
228 allow_bare = 1;
229 } else if ( arg[1] == 'o' && arg[2] ) {
230 dir = arg+2;
231 } else if ( arg[1] == '-' && !arg[2] ) {
232 argp++; /* -- marks end of options */
233 break;
234 } else {
235 die("unknown option: %s", arg);
236 }
237 }
239 if ( !dir ) {
240 /* Backwards compatibility: if no -o specified, accept
241 <mbox> <dir> or just <dir> */
242 switch (argc - (argp-argv)) {
243 case 1:
244 dir = argp[0];
245 argp = stdin_only;
246 break;
247 case 2:
248 stdin_only[0] = argp[0];
249 dir = argp[1];
250 argp = stdin_only;
251 break;
252 default:
253 usage(git_mailsplit_usage);
254 }
255 } else {
256 /* New usage: if no more argument, parse stdin */
257 if ( !*argp )
258 argp = stdin_only;
259 }
261 while (*argp) {
262 const char *arg = *argp++;
263 struct stat argstat;
264 int ret = 0;
266 if (arg[0] == '-' && arg[1] == 0) {
267 ret = split_mbox(arg, dir, allow_bare, nr_prec, nr);
268 if (ret < 0) {
269 error("cannot split patches from stdin");
270 return 1;
271 }
272 num += (ret - nr);
273 nr = ret;
274 continue;
275 }
277 if (stat(arg, &argstat) == -1) {
278 error("cannot stat %s (%s)", arg, strerror(errno));
279 return 1;
280 }
282 if (S_ISDIR(argstat.st_mode))
283 ret = split_maildir(arg, dir, nr_prec, nr);
284 else
285 ret = split_mbox(arg, dir, allow_bare, nr_prec, nr);
287 if (ret < 0) {
288 error("cannot split patches from %s", arg);
289 return 1;
290 }
291 num += (ret - nr);
292 nr = ret;
293 }
295 printf("%d\n", num);
297 return 0;
298 }