8b73edf498
When mbox argument is missing, read the mailbox from the standard input. Signed-off-by: Junio C Hamano <junkio@cox.net>
160 lines
3.1 KiB
C
160 lines
3.1 KiB
C
/*
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* Totally braindamaged mbox splitter program.
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*
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* It just splits a mbox into a list of files: "0001" "0002" ..
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* so you can process them further from there.
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*/
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#include <unistd.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <string.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <assert.h>
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#include "cache.h"
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static const char git_mailsplit_usage[] =
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"git-mailsplit [-d<prec>] [<mbox>] <directory>";
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static int is_from_line(const char *line, int len)
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{
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const char *colon;
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if (len < 20 || memcmp("From ", line, 5))
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return 0;
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colon = line + len - 2;
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line += 5;
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for (;;) {
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if (colon < line)
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return 0;
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if (*--colon == ':')
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break;
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}
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if (!isdigit(colon[-4]) ||
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!isdigit(colon[-2]) ||
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!isdigit(colon[-1]) ||
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!isdigit(colon[ 1]) ||
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!isdigit(colon[ 2]))
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return 0;
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/* year */
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if (strtol(colon+3, NULL, 10) <= 90)
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return 0;
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/* Ok, close enough */
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return 1;
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}
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/* Could be as small as 64, enough to hold a Unix "From " line. */
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static char buf[4096];
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/* Called with the first line (potentially partial)
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* already in buf[] -- normally that should begin with
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* the Unix "From " line. Write it into the specified
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* file.
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*/
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static int split_one(FILE *mbox, const char *name)
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{
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FILE *output = NULL;
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int len = strlen(buf);
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int fd;
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int status = 0;
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if (!is_from_line(buf, len))
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goto corrupt;
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fd = open(name, O_WRONLY | O_CREAT | O_EXCL, 0666);
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if (fd < 0)
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die("cannot open output file %s", name);
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output = fdopen(fd, "w");
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/* Copy it out, while searching for a line that begins with
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* "From " and having something that looks like a date format.
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*/
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for (;;) {
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int is_partial = (buf[len-1] != '\n');
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if (fputs(buf, output) == EOF)
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die("cannot write output");
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if (fgets(buf, sizeof(buf), mbox) == NULL) {
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if (feof(mbox)) {
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status = 1;
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break;
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}
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die("cannot read mbox");
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}
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len = strlen(buf);
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if (!is_partial && is_from_line(buf, len))
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break; /* done with one message */
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}
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fclose(output);
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return status;
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corrupt:
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if (output)
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fclose(output);
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unlink(name);
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fprintf(stderr, "corrupt mailbox\n");
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exit(1);
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}
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int main(int argc, const char **argv)
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{
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int i, nr, nr_prec = 4;
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FILE *mbox = NULL;
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for (i = 1; i < argc; i++) {
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const char *arg = argv[i];
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if (arg[0] != '-')
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break;
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/* do flags here */
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if (!strncmp(arg, "-d", 2)) {
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nr_prec = strtol(arg + 2, NULL, 10);
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if (nr_prec < 3 || 10 <= nr_prec)
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usage(git_mailsplit_usage);
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continue;
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}
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}
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/* Either one remaining arg (dir), or two (mbox and dir) */
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switch (argc - i) {
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case 1:
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mbox = stdin;
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break;
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case 2:
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if ((mbox = fopen(argv[i], "r")) == NULL)
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die("cannot open mbox %s for reading", argv[i]);
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break;
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default:
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usage(git_mailsplit_usage);
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}
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if (chdir(argv[argc - 1]) < 0)
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usage(git_mailsplit_usage);
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nr = 0;
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if (fgets(buf, sizeof(buf), mbox) == NULL)
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die("cannot read mbox");
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for (;;) {
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char name[10];
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sprintf(name, "%0*d", nr_prec, ++nr);
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switch (split_one(mbox, name)) {
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case 0:
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break;
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case 1:
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printf("%d\n", nr);
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return 0;
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default:
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exit(1);
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}
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}
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}
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