Andrew's git - gitweb.git/blob - 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
  12static const char git_mailsplit_usage[] =
  13"git mailsplit [-d<prec>] [-f<n>] [-b] [--keep-cr] -o<directory> [(<mbox>|<Maildir>)...]";
  14
  15static 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
  46static struct strbuf buf = STRBUF_INIT;
  47static 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 */
  54static 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
  97static int populate_maildir_list(struct string_list *list, const char *path)
  98{
  99        DIR *dir;
 100        struct dirent *dent;
 101        char name[PATH_MAX];
 102        char *subs[] = { "cur", "new", NULL };
 103        char **sub;
 104
 105        for (sub = subs; *sub; ++sub) {
 106                snprintf(name, sizeof(name), "%s/%s", path, *sub);
 107                if ((dir = opendir(name)) == NULL) {
 108                        if (errno == ENOENT)
 109                                continue;
 110                        error("cannot opendir %s (%s)", name, strerror(errno));
 111                        return -1;
 112                }
 113
 114                while ((dent = readdir(dir)) != NULL) {
 115                        if (dent->d_name[0] == '.')
 116                                continue;
 117                        snprintf(name, sizeof(name), "%s/%s", *sub, dent->d_name);
 118                        string_list_insert(list, name);
 119                }
 120
 121                closedir(dir);
 122        }
 123
 124        return 0;
 125}
 126
 127static int maildir_filename_cmp(const char *a, const char *b)
 128{
 129        while (*a && *b) {
 130                if (isdigit(*a) && isdigit(*b)) {
 131                        long int na, nb;
 132                        na = strtol(a, (char **)&a, 10);
 133                        nb = strtol(b, (char **)&b, 10);
 134                        if (na != nb)
 135                                return na - nb;
 136                        /* strtol advanced our pointers */
 137                }
 138                else {
 139                        if (*a != *b)
 140                                return (unsigned char)*a - (unsigned char)*b;
 141                        a++;
 142                        b++;
 143                }
 144        }
 145        return (unsigned char)*a - (unsigned char)*b;
 146}
 147
 148static int split_maildir(const char *maildir, const char *dir,
 149        int nr_prec, int skip)
 150{
 151        char file[PATH_MAX];
 152        char name[PATH_MAX];
 153        int ret = -1;
 154        int i;
 155        struct string_list list = STRING_LIST_INIT_DUP;
 156
 157        list.cmp = maildir_filename_cmp;
 158
 159        if (populate_maildir_list(&list, maildir) < 0)
 160                goto out;
 161
 162        for (i = 0; i < list.nr; i++) {
 163                FILE *f;
 164                snprintf(file, sizeof(file), "%s/%s", maildir, list.items[i].string);
 165                f = fopen(file, "r");
 166                if (!f) {
 167                        error("cannot open mail %s (%s)", file, strerror(errno));
 168                        goto out;
 169                }
 170
 171                if (strbuf_getwholeline(&buf, f, '\n')) {
 172                        error("cannot read mail %s (%s)", file, strerror(errno));
 173                        goto out;
 174                }
 175
 176                sprintf(name, "%s/%0*d", dir, nr_prec, ++skip);
 177                split_one(f, name, 1);
 178
 179                fclose(f);
 180        }
 181
 182        ret = skip;
 183out:
 184        string_list_clear(&list, 1);
 185        return ret;
 186}
 187
 188static int split_mbox(const char *file, const char *dir, int allow_bare,
 189                      int nr_prec, int skip)
 190{
 191        char name[PATH_MAX];
 192        int ret = -1;
 193        int peek;
 194
 195        FILE *f = !strcmp(file, "-") ? stdin : fopen(file, "r");
 196        int file_done = 0;
 197
 198        if (!f) {
 199                error("cannot open mbox %s", file);
 200                goto out;
 201        }
 202
 203        do {
 204                peek = fgetc(f);
 205        } while (isspace(peek));
 206        ungetc(peek, f);
 207
 208        if (strbuf_getwholeline(&buf, f, '\n')) {
 209                /* empty stdin is OK */
 210                if (f != stdin) {
 211                        error("cannot read mbox %s", file);
 212                        goto out;
 213                }
 214                file_done = 1;
 215        }
 216
 217        while (!file_done) {
 218                sprintf(name, "%s/%0*d", dir, nr_prec, ++skip);
 219                file_done = split_one(f, name, allow_bare);
 220        }
 221
 222        if (f != stdin)
 223                fclose(f);
 224
 225        ret = skip;
 226out:
 227        return ret;
 228}
 229
 230int cmd_mailsplit(int argc, const char **argv, const char *prefix)
 231{
 232        int nr = 0, nr_prec = 4, num = 0;
 233        int allow_bare = 0;
 234        const char *dir = NULL;
 235        const char **argp;
 236        static const char *stdin_only[] = { "-", NULL };
 237
 238        for (argp = argv+1; *argp; argp++) {
 239                const char *arg = *argp;
 240
 241                if (arg[0] != '-')
 242                        break;
 243                /* do flags here */
 244                if ( arg[1] == 'd' ) {
 245                        nr_prec = strtol(arg+2, NULL, 10);
 246                        if (nr_prec < 3 || 10 <= nr_prec)
 247                                usage(git_mailsplit_usage);
 248                        continue;
 249                } else if ( arg[1] == 'f' ) {
 250                        nr = strtol(arg+2, NULL, 10);
 251                } else if ( arg[1] == 'h' ) {
 252                        usage(git_mailsplit_usage);
 253                } else if ( arg[1] == 'b' && !arg[2] ) {
 254                        allow_bare = 1;
 255                } else if (!strcmp(arg, "--keep-cr")) {
 256                        keep_cr = 1;
 257                } else if ( arg[1] == 'o' && arg[2] ) {
 258                        dir = arg+2;
 259                } else if ( arg[1] == '-' && !arg[2] ) {
 260                        argp++; /* -- marks end of options */
 261                        break;
 262                } else {
 263                        die("unknown option: %s", arg);
 264                }
 265        }
 266
 267        if ( !dir ) {
 268                /* Backwards compatibility: if no -o specified, accept
 269                   <mbox> <dir> or just <dir> */
 270                switch (argc - (argp-argv)) {
 271                case 1:
 272                        dir = argp[0];
 273                        argp = stdin_only;
 274                        break;
 275                case 2:
 276                        stdin_only[0] = argp[0];
 277                        dir = argp[1];
 278                        argp = stdin_only;
 279                        break;
 280                default:
 281                        usage(git_mailsplit_usage);
 282                }
 283        } else {
 284                /* New usage: if no more argument, parse stdin */
 285                if ( !*argp )
 286                        argp = stdin_only;
 287        }
 288
 289        while (*argp) {
 290                const char *arg = *argp++;
 291                struct stat argstat;
 292                int ret = 0;
 293
 294                if (arg[0] == '-' && arg[1] == 0) {
 295                        ret = split_mbox(arg, dir, allow_bare, nr_prec, nr);
 296                        if (ret < 0) {
 297                                error("cannot split patches from stdin");
 298                                return 1;
 299                        }
 300                        num += (ret - nr);
 301                        nr = ret;
 302                        continue;
 303                }
 304
 305                if (stat(arg, &argstat) == -1) {
 306                        error("cannot stat %s (%s)", arg, strerror(errno));
 307                        return 1;
 308                }
 309
 310                if (S_ISDIR(argstat.st_mode))
 311                        ret = split_maildir(arg, dir, nr_prec, nr);
 312                else
 313                        ret = split_mbox(arg, dir, allow_bare, nr_prec, nr);
 314
 315                if (ret < 0) {
 316                        error("cannot split patches from %s", arg);
 317                        return 1;
 318                }
 319                num += (ret - nr);
 320                nr = ret;
 321        }
 322
 323        printf("%d\n", num);
 324
 325        return 0;
 326}