builtin-mailsplit.c - git - Git at Google

 /*
  * 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 "string-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];

 /* We cannot use fgets() because our lines can contain NULs */
 int read_line_with_nul(char *buf, int size, FILE *in)
 {
 	int len = 0, c;

 	for (;;) {
 		c = getc(in);
 		if (c == EOF)
 			break;
 		buf[len++] = c;
 		if (c == '\n' || len + 1 >= size)
 			break;
 	}
 	buf[len] = '\0';

 	return len;
 }

 /* 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_errno("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 = len && buf[len-1] != '\n';

 		if (fwrite(buf, 1, len, output) != len)
 			die_errno("cannot write output");

 		len = read_line_with_nul(buf, sizeof(buf), mbox);
 		if (len == 0) {
 			if (feof(mbox)) {
 				status = 1;
 				break;
 			}
 			die_errno("cannot read mbox");
 		}
 		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 string_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);
 			string_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 string_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].string);
 		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:
 	string_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;
 }
	/*
	* 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 "string-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];

	/* We cannot use fgets() because our lines can contain NULs */
	int read_line_with_nul(char buf, int size, FILE in)
	{
	int len = 0, c;

	for (;;) {
	c = getc(in);
	if (c == EOF)
	break;
	buf[len++] = c;
	if (c == '\n' \|\| len + 1 >= size)
	break;
	}
	buf[len] = '\0';

	return len;
	}

	/* 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_errno("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 = len && buf[len-1] != '\n';

	if (fwrite(buf, 1, len, output) != len)
	die_errno("cannot write output");

	len = read_line_with_nul(buf, sizeof(buf), mbox);
	if (len == 0) {
	if (feof(mbox)) {
	status = 1;
	break;
	}
	die_errno("cannot read mbox");
	}
	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 string_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);
	string_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 string_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].string);
	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:
	string_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;
	}