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