#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
-#include <sys/mman.h>
#include <string.h>
#include <stdio.h>
-#include <ctype.h>
-#include <assert.h>
+#include "cache.h"
-static int usage(void)
-{
- fprintf(stderr, "git-mailsplit [-d<prec>] <mbox> <directory>\n");
- exit(1);
-}
-
-static int linelen(const char *map, unsigned long size)
-{
- int len = 0, c;
-
- do {
- c = *map;
- map++;
- size--;
- len++;
- } while (size && c != '\n');
- return len;
-}
+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)
{
return 1;
}
-static int parse_email(const void *map, unsigned long size)
+/* 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)
{
- unsigned long offset;
+ FILE *output = NULL;
+ int len = strlen(buf);
+ int fd;
+ int status = 0;
+ int is_bare = !is_from_line(buf, len);
- if (size < 6 || memcmp("From ", map, 5))
+ if (is_bare && !allow_bare)
goto corrupt;
- /* Make sure we don't trigger on this first line */
- map++; size--; offset=1;
+ fd = open(name, O_WRONLY | O_CREAT | O_EXCL, 0666);
+ if (fd < 0)
+ die("cannot open output file %s", name);
+ output = fdopen(fd, "w");
- /*
- * Search for a line beginning with "From ", and
- * having something that looks like a date format.
+ /* Copy it out, while searching for a line that begins with
+ * "From " and having something that looks like a date format.
*/
- do {
- int len = linelen(map, size);
- if (is_from_line(map, len))
- return offset;
- map += len;
- size -= len;
- offset += len;
- } while (size);
- return offset;
-
-corrupt:
+ 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 main(int argc, char **argv)
+int main(int argc, const char **argv)
{
- int fd, nr, nr_prec = 4;
- struct stat st;
- unsigned long size;
- void *map;
-
- if (argc == 4 && !strncmp(argv[1], "-d", 2)) {
- nr_prec = strtol(argv[1] + 2, NULL, 10);
- if (nr_prec < 3 || 10 <= nr_prec)
- usage();
- argc--; argv++;
- }
- if (argc != 3)
- usage();
- fd = open(argv[1], O_RDONLY);
- if (fd < 0) {
- perror(argv[1]);
- exit(1);
- }
- if (chdir(argv[2]) < 0)
- usage();
- if (fstat(fd, &st) < 0) {
- perror("stat");
- exit(1);
+ int nr = 0, nr_prec = 4;
+ int allow_bare = 0;
+ const char *dir = NULL;
+ const char **argp;
+ static const char *stdin_only[] = { "-", NULL };
+ char *name;
+
+ 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);
+ }
}
- size = st.st_size;
- map = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
- if (map == MAP_FAILED) {
- perror("mmap");
- close(fd);
- exit(1);
+
+ 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;
}
- close(fd);
- nr = 0;
- do {
- char name[10];
- unsigned long len = parse_email(map, size);
- assert(len <= size);
- sprintf(name, "%0*d", nr_prec, ++nr);
- fd = open(name, O_WRONLY | O_CREAT | O_EXCL, 0666);
- if (fd < 0) {
- perror(name);
- exit(1);
+
+ name = xmalloc(strlen(dir) + 2 + 3 * sizeof(nr));
+
+ while (*argp) {
+ const char *file = *argp++;
+ FILE *f = !strcmp(file, "-") ? stdin : fopen(file, "r");
+ int file_done = 0;
+
+ if ( !f )
+ die ("cannot open mbox %s", file);
+
+ if (fgets(buf, sizeof(buf), f) == NULL) {
+ if (f == stdin)
+ break; /* empty stdin is OK */
+ die("cannot read mbox %s", file);
}
- if (write(fd, map, len) != len) {
- perror("write");
- exit(1);
+
+ while (!file_done) {
+ sprintf(name, "%s/%0*d", dir, nr_prec, ++nr);
+ file_done = split_one(f, name, allow_bare);
}
- close(fd);
- map += len;
- size -= len;
- } while (size > 0);
+
+ if (f != stdin)
+ fclose(f);
+ }
+
printf("%d\n", nr);
return 0;
}