chown.c

/*
 * Copyright (c) 2012 Miek Gieben
 * Parse username:group helper files
 */

#include "rdup.h"

/* signal.c */
void got_sig(int signal);

/* write a chown helper file */
void
chown_write(gchar *dir, gchar *base, uid_t u, gchar *user, gid_t g, gchar *group)
{
        FILE *f;
        gchar *path;
        if (base == NULL) {
                /* a directory, i.e. /tmp/._rdup_. */
                path = g_strdup_printf("%s/%s", dir, USRGRPINFO);
        } else {
                path = g_strdup_printf("%s/%s%s", dir, USRGRPINFO, base);
        }
        if ( ! ( f = fopen(path, "w"))) {
                /* no file found or failure to open */
                g_free(path);
                return;
        }
        g_free(path);
        fprintf(f, "%s:%d/%s:%d\n", user, u, group, g);
        fclose(f);
}

/* parse the chown help file */
struct chown_pack *
chown_parse(gchar *dir, gchar *base)
{
        FILE *f;
        gchar *path;
        if (base == NULL) {
                /* a directory */
                path = g_strdup_printf("%s/%s", dir, USRGRPINFO);
        } else {
                path = g_strdup_printf("%s/%s%s", dir, USRGRPINFO, base);
        }
        if ( ! ( f = fopen(path, "r"))) {
                /* no file found or failure to open */
                g_free(path);
                return NULL;
        }
        long int u, g;
        gchar *user = g_malloc(17);
        gchar *group = g_malloc(17);
        struct chown_pack *cp = g_malloc(sizeof(struct chown_pack));
        if ( fscanf(f, "%16[^:]:%ld/%16[^:]:%ld\n", user, &u, group, &g) != 4) {
                /* failure to parse the file */
                return NULL;
        }
        cp->u = (uid_t)u;
        cp->g = (gid_t)g;
        cp->user = user;
        cp->group = group;
        return cp;
}