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tag: v1.5.4.6
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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 "cache.h"
#include "builtin.h"
#include "path-list.h"

static const char git_mailsplit_usage[] =
"git-mailsplit [-d<prec>] [-f<n>] [-b] -o<directory> <mbox>|<Maildir>...";

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, int allow_bare)
{
FILE *output = NULL;
int len = strlen(buf);
int fd;
int status = 0;
int is_bare = !is_from_line(buf, len);

if (is_bare && !allow_bare)
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_bare && 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);
}

static int populate_maildir_list(struct path_list *list, const char *path)
{
DIR *dir;
struct dirent *dent;
char name[PATH_MAX];
char *subs[] = { "cur", "new", NULL };
char **sub;

for (sub = subs; *sub; ++sub) {
snprintf(name, sizeof(name), "%s/%s", path, *sub);
if ((dir = opendir(name)) == NULL) {
if (errno == ENOENT)
continue;
error("cannot opendir %s (%s)", name, strerror(errno));
return -1;
}

while ((dent = readdir(dir)) != NULL) {
if (dent->d_name[0] == '.')
continue;
snprintf(name, sizeof(name), "%s/%s", *sub, dent->d_name);
path_list_insert(name, list);
}

closedir(dir);
}

return 0;
}

static int split_maildir(const char *maildir, const char *dir,
int nr_prec, int skip)
{
char file[PATH_MAX];
char name[PATH_MAX];
int ret = -1;
int i;
struct path_list list = {NULL, 0, 0, 1};

if (populate_maildir_list(&list, maildir) < 0)
goto out;

for (i = 0; i < list.nr; i++) {
FILE *f;
snprintf(file, sizeof(file), "%s/%s", maildir, list.items[i].path);
f = fopen(file, "r");
if (!f) {
error("cannot open mail %s (%s)", file, strerror(errno));
goto out;
}

if (fgets(buf, sizeof(buf), f) == NULL) {
error("cannot read mail %s (%s)", file, strerror(errno));
goto out;
}

sprintf(name, "%s/%0*d", dir, nr_prec, ++skip);
split_one(f, name, 1);

fclose(f);
}

ret = skip;
out:
path_list_clear(&list, 1);
return ret;
}

static int split_mbox(const char *file, const char *dir, int allow_bare,
int nr_prec, int skip)
{
char name[PATH_MAX];
int ret = -1;
int peek;

FILE *f = !strcmp(file, "-") ? stdin : fopen(file, "r");
int file_done = 0;

if (!f) {
error("cannot open mbox %s", file);
goto out;
}

do {
peek = fgetc(f);
} while (isspace(peek));
ungetc(peek, f);

if (fgets(buf, sizeof(buf), f) == NULL) {
/* empty stdin is OK */
if (f != stdin) {
error("cannot read mbox %s", file);
goto out;
}
file_done = 1;
}

while (!file_done) {
sprintf(name, "%s/%0*d", dir, nr_prec, ++skip);
file_done = split_one(f, name, allow_bare);
}

if (f != stdin)
fclose(f);

ret = skip;
out:
return ret;
}

int cmd_mailsplit(int argc, const char **argv, const char *prefix)
{
int nr = 0, nr_prec = 4, num = 0;
int allow_bare = 0;
const char *dir = NULL;
const char **argp;
static const char *stdin_only[] = { "-", NULL };

for (argp = argv+1; *argp; argp++) {
const char *arg = *argp;

if (arg[0] != '-')
break;
/* do flags here */
if ( arg[1] == 'd' ) {
nr_prec = strtol(arg+2, NULL, 10);
if (nr_prec < 3 || 10 <= nr_prec)
usage(git_mailsplit_usage);
continue;
} else if ( arg[1] == 'f' ) {
nr = strtol(arg+2, NULL, 10);
} else if ( arg[1] == 'b' && !arg[2] ) {
allow_bare = 1;
} else if ( arg[1] == 'o' && arg[2] ) {
dir = arg+2;
} else if ( arg[1] == '-' && !arg[2] ) {
argp++; /* -- marks end of options */
break;
} else {
die("unknown option: %s", arg);
}
}

if ( !dir ) {
/* Backwards compatibility: if no -o specified, accept
<mbox> <dir> or just <dir> */
switch (argc - (argp-argv)) {
case 1:
dir = argp[0];
argp = stdin_only;
break;
case 2:
stdin_only[0] = argp[0];
dir = argp[1];
argp = stdin_only;
break;
default:
usage(git_mailsplit_usage);
}
} else {
/* New usage: if no more argument, parse stdin */
if ( !*argp )
argp = stdin_only;
}

while (*argp) {
const char *arg = *argp++;
struct stat argstat;
int ret = 0;

if (arg[0] == '-' && arg[1] == 0) {
ret = split_mbox(arg, dir, allow_bare, nr_prec, nr);
if (ret < 0) {
error("cannot split patches from stdin");
return 1;
}
num += (ret - nr);
nr = ret;
continue;
}

if (stat(arg, &argstat) == -1) {
error("cannot stat %s (%s)", arg, strerror(errno));
return 1;
}

if (S_ISDIR(argstat.st_mode))
ret = split_maildir(arg, dir, nr_prec, nr);
else
ret = split_mbox(arg, dir, allow_bare, nr_prec, nr);

if (ret < 0) {
error("cannot split patches from %s", arg);
return 1;
}
num += (ret - nr);
nr = ret;
}

printf("%d\n", num);

return 0;
}
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