Make git-mailsplit a builtin

Signed-off-by: Lukas Sandström <lukass@etek.chalmers.se>
Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 201 insertions, 0 deletions

diff --git a/builtin-mailsplit.c b/builtin-mailsplit.c
new file mode 100644
index 0000000000..e2a0058435
--- /dev/null
+++ b/builtin-mailsplit.c
@@ -0,0 +1,201 @@
+/*
+ * 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 "cache.h"
+#include "builtin.h"
+
+static const char git_mailsplit_usage[] =
+"git-mailsplit [-d<prec>] [-f<n>] [-b] -o<directory> <mbox>...";
+
+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);
+}
+
+int split_mbox(const char **mbox, const char *dir, int allow_bare, int nr_prec, int skip)
+{
+	char *name = xmalloc(strlen(dir) + 2 + 3 * sizeof(skip));
+	int ret = -1;
+
+	while (*mbox) {
+		const char *file = *mbox++;
+		FILE *f = !strcmp(file, "-") ? stdin : fopen(file, "r");
+		int file_done = 0;
+
+		if ( !f ) {
+			error("cannot open mbox %s", file);
+			goto out;
+		}
+
+		if (fgets(buf, sizeof(buf), f) == NULL) {
+			if (f == stdin)
+				break; /* empty stdin is OK */
+			error("cannot read mbox %s", file);
+			goto out;
+		}
+
+		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:
+	free(name);
+	return ret;
+}
+int cmd_mailsplit(int argc, const char **argv, char **envp)
+{
+	int nr = 0, nr_prec = 4, ret;
+	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;
+	}
+
+	ret = split_mbox(argp, dir, allow_bare, nr_prec, nr);
+	if (ret != -1)
+		printf("%d\n", ret);
+
+	return ret == -1;
+}