mailsplit: make PATH_MAX buffers dynamic
[git/git.git] / builtin / mailsplit.c
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"
11
12 static const char git_mailsplit_usage[] =
13 "git mailsplit [-d<prec>] [-f<n>] [-b] [--keep-cr] -o<directory> [(<mbox>|<Maildir>)...]";
14
15 static int is_from_line(const char *line, int len)
16 {
17 const char *colon;
18
19 if (len < 20 || memcmp("From ", line, 5))
20 return 0;
21
22 colon = line + len - 2;
23 line += 5;
24 for (;;) {
25 if (colon < line)
26 return 0;
27 if (*--colon == ':')
28 break;
29 }
30
31 if (!isdigit(colon[-4]) ||
32 !isdigit(colon[-2]) ||
33 !isdigit(colon[-1]) ||
34 !isdigit(colon[ 1]) ||
35 !isdigit(colon[ 2]))
36 return 0;
37
38 /* year */
39 if (strtol(colon+3, NULL, 10) <= 90)
40 return 0;
41
42 /* Ok, close enough */
43 return 1;
44 }
45
46 static struct strbuf buf = STRBUF_INIT;
47 static int keep_cr;
48
49 /* Called with the first line (potentially partial)
50 * already in buf[] -- normally that should begin with
51 * the Unix "From " line. Write it into the specified
52 * file.
53 */
54 static int split_one(FILE *mbox, const char *name, int allow_bare)
55 {
56 FILE *output;
57 int fd;
58 int status = 0;
59 int is_bare = !is_from_line(buf.buf, buf.len);
60
61 if (is_bare && !allow_bare) {
62 fprintf(stderr, "corrupt mailbox\n");
63 exit(1);
64 }
65 fd = open(name, O_WRONLY | O_CREAT | O_EXCL, 0666);
66 if (fd < 0)
67 die_errno("cannot open output file '%s'", name);
68 output = xfdopen(fd, "w");
69
70 /* Copy it out, while searching for a line that begins with
71 * "From " and having something that looks like a date format.
72 */
73 for (;;) {
74 if (!keep_cr && buf.len > 1 && buf.buf[buf.len-1] == '\n' &&
75 buf.buf[buf.len-2] == '\r') {
76 strbuf_setlen(&buf, buf.len-2);
77 strbuf_addch(&buf, '\n');
78 }
79
80 if (fwrite(buf.buf, 1, buf.len, output) != buf.len)
81 die_errno("cannot write output");
82
83 if (strbuf_getwholeline(&buf, mbox, '\n')) {
84 if (feof(mbox)) {
85 status = 1;
86 break;
87 }
88 die_errno("cannot read mbox");
89 }
90 if (!is_bare && is_from_line(buf.buf, buf.len))
91 break; /* done with one message */
92 }
93 fclose(output);
94 return status;
95 }
96
97 static int populate_maildir_list(struct string_list *list, const char *path)
98 {
99 DIR *dir;
100 struct dirent *dent;
101 char *name = NULL;
102 char *subs[] = { "cur", "new", NULL };
103 char **sub;
104 int ret = -1;
105
106 for (sub = subs; *sub; ++sub) {
107 free(name);
108 name = xstrfmt("%s/%s", path, *sub);
109 if ((dir = opendir(name)) == NULL) {
110 if (errno == ENOENT)
111 continue;
112 error("cannot opendir %s (%s)", name, strerror(errno));
113 goto out;
114 }
115
116 while ((dent = readdir(dir)) != NULL) {
117 if (dent->d_name[0] == '.')
118 continue;
119 free(name);
120 name = xstrfmt("%s/%s", *sub, dent->d_name);
121 string_list_insert(list, name);
122 }
123
124 closedir(dir);
125 }
126
127 ret = 0;
128
129 out:
130 free(name);
131 return ret;
132 }
133
134 static int maildir_filename_cmp(const char *a, const char *b)
135 {
136 while (*a && *b) {
137 if (isdigit(*a) && isdigit(*b)) {
138 long int na, nb;
139 na = strtol(a, (char **)&a, 10);
140 nb = strtol(b, (char **)&b, 10);
141 if (na != nb)
142 return na - nb;
143 /* strtol advanced our pointers */
144 }
145 else {
146 if (*a != *b)
147 return (unsigned char)*a - (unsigned char)*b;
148 a++;
149 b++;
150 }
151 }
152 return (unsigned char)*a - (unsigned char)*b;
153 }
154
155 static int split_maildir(const char *maildir, const char *dir,
156 int nr_prec, int skip)
157 {
158 char *file = NULL;
159 FILE *f = NULL;
160 int ret = -1;
161 int i;
162 struct string_list list = STRING_LIST_INIT_DUP;
163
164 list.cmp = maildir_filename_cmp;
165
166 if (populate_maildir_list(&list, maildir) < 0)
167 goto out;
168
169 for (i = 0; i < list.nr; i++) {
170 char *name;
171
172 free(file);
173 file = xstrfmt("%s/%s", maildir, list.items[i].string);
174
175 f = fopen(file, "r");
176 if (!f) {
177 error("cannot open mail %s (%s)", file, strerror(errno));
178 goto out;
179 }
180
181 if (strbuf_getwholeline(&buf, f, '\n')) {
182 error("cannot read mail %s (%s)", file, strerror(errno));
183 goto out;
184 }
185
186 name = xstrfmt("%s/%0*d", dir, nr_prec, ++skip);
187 split_one(f, name, 1);
188 free(name);
189
190 fclose(f);
191 f = NULL;
192 }
193
194 ret = skip;
195 out:
196 if (f)
197 fclose(f);
198 free(file);
199 string_list_clear(&list, 1);
200 return ret;
201 }
202
203 static int split_mbox(const char *file, const char *dir, int allow_bare,
204 int nr_prec, int skip)
205 {
206 int ret = -1;
207 int peek;
208
209 FILE *f = !strcmp(file, "-") ? stdin : fopen(file, "r");
210 int file_done = 0;
211
212 if (!f) {
213 error("cannot open mbox %s", file);
214 goto out;
215 }
216
217 do {
218 peek = fgetc(f);
219 } while (isspace(peek));
220 ungetc(peek, f);
221
222 if (strbuf_getwholeline(&buf, f, '\n')) {
223 /* empty stdin is OK */
224 if (f != stdin) {
225 error("cannot read mbox %s", file);
226 goto out;
227 }
228 file_done = 1;
229 }
230
231 while (!file_done) {
232 char *name = xstrfmt("%s/%0*d", dir, nr_prec, ++skip);
233 file_done = split_one(f, name, allow_bare);
234 free(name);
235 }
236
237 if (f != stdin)
238 fclose(f);
239
240 ret = skip;
241 out:
242 return ret;
243 }
244
245 int cmd_mailsplit(int argc, const char **argv, const char *prefix)
246 {
247 int nr = 0, nr_prec = 4, num = 0;
248 int allow_bare = 0;
249 const char *dir = NULL;
250 const char **argp;
251 static const char *stdin_only[] = { "-", NULL };
252
253 for (argp = argv+1; *argp; argp++) {
254 const char *arg = *argp;
255
256 if (arg[0] != '-')
257 break;
258 /* do flags here */
259 if ( arg[1] == 'd' ) {
260 nr_prec = strtol(arg+2, NULL, 10);
261 if (nr_prec < 3 || 10 <= nr_prec)
262 usage(git_mailsplit_usage);
263 continue;
264 } else if ( arg[1] == 'f' ) {
265 nr = strtol(arg+2, NULL, 10);
266 } else if ( arg[1] == 'h' ) {
267 usage(git_mailsplit_usage);
268 } else if ( arg[1] == 'b' && !arg[2] ) {
269 allow_bare = 1;
270 } else if (!strcmp(arg, "--keep-cr")) {
271 keep_cr = 1;
272 } else if ( arg[1] == 'o' && arg[2] ) {
273 dir = arg+2;
274 } else if ( arg[1] == '-' && !arg[2] ) {
275 argp++; /* -- marks end of options */
276 break;
277 } else {
278 die("unknown option: %s", arg);
279 }
280 }
281
282 if ( !dir ) {
283 /* Backwards compatibility: if no -o specified, accept
284 <mbox> <dir> or just <dir> */
285 switch (argc - (argp-argv)) {
286 case 1:
287 dir = argp[0];
288 argp = stdin_only;
289 break;
290 case 2:
291 stdin_only[0] = argp[0];
292 dir = argp[1];
293 argp = stdin_only;
294 break;
295 default:
296 usage(git_mailsplit_usage);
297 }
298 } else {
299 /* New usage: if no more argument, parse stdin */
300 if ( !*argp )
301 argp = stdin_only;
302 }
303
304 while (*argp) {
305 const char *arg = *argp++;
306 struct stat argstat;
307 int ret = 0;
308
309 if (arg[0] == '-' && arg[1] == 0) {
310 ret = split_mbox(arg, dir, allow_bare, nr_prec, nr);
311 if (ret < 0) {
312 error("cannot split patches from stdin");
313 return 1;
314 }
315 num += (ret - nr);
316 nr = ret;
317 continue;
318 }
319
320 if (stat(arg, &argstat) == -1) {
321 error("cannot stat %s (%s)", arg, strerror(errno));
322 return 1;
323 }
324
325 if (S_ISDIR(argstat.st_mode))
326 ret = split_maildir(arg, dir, nr_prec, nr);
327 else
328 ret = split_mbox(arg, dir, allow_bare, nr_prec, nr);
329
330 if (ret < 0) {
331 error("cannot split patches from %s", arg);
332 return 1;
333 }
334 num += (ret - nr);
335 nr = ret;
336 }
337
338 printf("%d\n", num);
339
340 return 0;
341 }