Andrew's git - gitweb.git/blob

   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 <unistd.h>
   8#include <stdlib.h>
   9#include <fcntl.h>
  10#include <sys/types.h>
  11#include <sys/stat.h>
  12#include <string.h>
  13#include <stdio.h>
  14#include <ctype.h>
  15#include <assert.h>
  16#include "cache.h"
  17
  18static const char git_mailsplit_usage[] =
  19"git-mailsplit [-d<prec>] [<mbox>] <directory>";
  20
  21static int is_from_line(const char *line, int len)
  22{
  23        const char *colon;
  24
  25        if (len < 20 || memcmp("From ", line, 5))
  26                return 0;
  27
  28        colon = line + len - 2;
  29        line += 5;
  30        for (;;) {
  31                if (colon < line)
  32                        return 0;
  33                if (*--colon == ':')
  34                        break;
  35        }
  36
  37        if (!isdigit(colon[-4]) ||
  38            !isdigit(colon[-2]) ||
  39            !isdigit(colon[-1]) ||
  40            !isdigit(colon[ 1]) ||
  41            !isdigit(colon[ 2]))
  42                return 0;
  43
  44        /* year */
  45        if (strtol(colon+3, NULL, 10) <= 90)
  46                return 0;
  47
  48        /* Ok, close enough */
  49        return 1;
  50}
  51
  52/* Could be as small as 64, enough to hold a Unix "From " line. */
  53static char buf[4096];
  54
  55/* Called with the first line (potentially partial)
  56 * already in buf[] -- normally that should begin with
  57 * the Unix "From " line.  Write it into the specified
  58 * file.
  59 */
  60static int split_one(FILE *mbox, const char *name)
  61{
  62        FILE *output = NULL;
  63        int len = strlen(buf);
  64        int fd;
  65        int status = 0;
  66
  67        if (!is_from_line(buf, len))
  68                goto corrupt;
  69
  70        fd = open(name, O_WRONLY | O_CREAT | O_EXCL, 0666);
  71        if (fd < 0)
  72                die("cannot open output file %s", name);
  73        output = fdopen(fd, "w");
  74
  75        /* Copy it out, while searching for a line that begins with
  76         * "From " and having something that looks like a date format.
  77         */
  78        for (;;) {
  79                int is_partial = (buf[len-1] != '\n');
  80
  81                if (fputs(buf, output) == EOF)
  82                        die("cannot write output");
  83
  84                if (fgets(buf, sizeof(buf), mbox) == NULL) {
  85                        if (feof(mbox)) {
  86                                status = 1;
  87                                break;
  88                        }
  89                        die("cannot read mbox");
  90                }
  91                len = strlen(buf);
  92                if (!is_partial && is_from_line(buf, len))
  93                        break; /* done with one message */
  94        }
  95        fclose(output);
  96        return status;
  97
  98 corrupt:
  99        if (output)
 100                fclose(output);
 101        unlink(name);
 102        fprintf(stderr, "corrupt mailbox\n");
 103        exit(1);
 104}
 105
 106int main(int argc, const char **argv)
 107{
 108        int i, nr, nr_prec = 4;
 109        FILE *mbox = NULL;
 110
 111        for (i = 1; i < argc; i++) {
 112                const char *arg = argv[i];
 113
 114                if (arg[0] != '-')
 115                        break;
 116                /* do flags here */
 117                if (!strncmp(arg, "-d", 2)) {
 118                        nr_prec = strtol(arg + 2, NULL, 10);
 119                        if (nr_prec < 3 || 10 <= nr_prec)
 120                                usage(git_mailsplit_usage);
 121                        continue;
 122                }
 123        }
 124
 125        /* Either one remaining arg (dir), or two (mbox and dir) */
 126        switch (argc - i) {
 127        case 1:
 128                mbox = stdin;
 129                break;
 130        case 2:
 131                if ((mbox = fopen(argv[i], "r")) == NULL)
 132                        die("cannot open mbox %s for reading", argv[i]);
 133                break;
 134        default:
 135                usage(git_mailsplit_usage);
 136        }
 137        if (chdir(argv[argc - 1]) < 0)
 138                usage(git_mailsplit_usage);
 139
 140        nr = 0;
 141        if (fgets(buf, sizeof(buf), mbox) == NULL)
 142                die("cannot read mbox");
 143
 144        for (;;) {
 145                char name[10];
 146
 147                sprintf(name, "%0*d", nr_prec, ++nr);
 148                switch (split_one(mbox, name)) {
 149                case 0:
 150                        break;
 151                case 1:
 152                        printf("%d\n", nr);
 153                        return 0;
 154                default:
 155                        exit(1);
 156                }
 157        }
 158}