builtin/mailsplit.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
is_from_line
split_one
populate_maildir_list
maildir_filename_cmp
split_maildir
split_mbox
cmd_mailsplit
/*
 * 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"
#include "strbuf.h"

static const char git_mailsplit_usage[] =
"git mailsplit [-d<prec>] [-f<n>] [-b] [--keep-cr] -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;
}

static struct strbuf buf = STRBUF_INIT;
static int keep_cr;

/* 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;
        int fd;
        int status = 0;
        int is_bare = !is_from_line(buf.buf, buf.len);

        if (is_bare && !allow_bare) {
                fprintf(stderr, "corrupt mailbox\n");
                exit(1);
        }
        fd = open(name, O_WRONLY | O_CREAT | O_EXCL, 0666);
        if (fd < 0)
                die_errno("cannot open output file '%s'", name);
        output = xfdopen(fd, "w");

        /* Copy it out, while searching for a line that begins with
         * "From " and having something that looks like a date format.
         */
        for (;;) {
                if (!keep_cr && buf.len > 1 && buf.buf[buf.len-1] == '\n' &&
                        buf.buf[buf.len-2] == '\r') {
                        strbuf_setlen(&buf, buf.len-2);
                        strbuf_addch(&buf, '\n');
                }

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

                if (strbuf_getwholeline(&buf, mbox, '\n')) {
                        if (feof(mbox)) {
                                status = 1;
                                break;
                        }
                        die_errno("cannot read mbox");
                }
                if (!is_bare && is_from_line(buf.buf, buf.len))
                        break; /* done with one message */
        }
        fclose(output);
        return status;
}

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(list, name);
                }

                closedir(dir);
        }

        return 0;
}

static int maildir_filename_cmp(const char *a, const char *b)
{
        while (*a && *b) {
                if (isdigit(*a) && isdigit(*b)) {
                        long int na, nb;
                        na = strtol(a, (char **)&a, 10);
                        nb = strtol(b, (char **)&b, 10);
                        if (na != nb)
                                return na - nb;
                        /* strtol advanced our pointers */
                }
                else {
                        if (*a != *b)
                                return (unsigned char)*a - (unsigned char)*b;
                        a++;
                        b++;
                }
        }
        return (unsigned char)*a - (unsigned char)*b;
}

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 = STRING_LIST_INIT_DUP;

        list.cmp = maildir_filename_cmp;

        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 (strbuf_getwholeline(&buf, f, '\n')) {
                        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 (strbuf_getwholeline(&buf, f, '\n')) {
                /* 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] == 'h' ) {
                        usage(git_mailsplit_usage);
                } else if ( arg[1] == 'b' && !arg[2] ) {
                        allow_bare = 1;
                } else if (!strcmp(arg, "--keep-cr")) {
                        keep_cr = 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;
}
/* [<][>][^][v][top][bottom][index][help] */
root/builtin/mailsplit.c

DEFINITIONS
