exec/exec_replace.c

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00001 // Copyright (C) 2006-2007 Benedikt Böhm <hollow@gentoo.org>
00002 //
00003 // This program is free software; you can redistribute it and/or
00004 // modify it under the terms of the GNU General Public License
00005 // as published by the Free Software Foundation; either version 2
00006 // of the License, or (at your option) any later version.
00007 //
00008 // This program is distributed in the hope that it will be useful,
00009 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00010 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00011 // GNU General Public License for more details.
00012 //
00013 // You should have received a copy of the GNU General Public License
00014 // along with this program; if not, write to the Free Software
00015 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
00016 
00017 #include <unistd.h>
00018 #include <stdarg.h>
00019 
00020 #include "exec.h"
00021 #include "mem.h"
00022 #include "printf.h"
00023 #include "strtok.h"
00024 
00025 int exec_replace(const char *fmt, ...)
00026 {
00027         va_list ap;
00028         va_start(ap, fmt);
00029 
00030         char *cmd;
00031 
00032         if (_lucid_vasprintf(&cmd, fmt, ap) == -1) {
00033                 va_end(ap);
00034                 return -1;
00035         }
00036 
00037         va_end(ap);
00038 
00039         strtok_t _st, *st = &_st;
00040 
00041         if (!strtok_init_str(st, cmd, " ", 0)) {
00042                 mem_free(cmd);
00043                 return -1;
00044         }
00045 
00046         mem_free(cmd);
00047 
00048         int argc    = strtok_count(st);
00049         char **argv = mem_alloc((argc + 1) * sizeof(char *));
00050 
00051         if (!argv) {
00052                 strtok_free(st);
00053                 return -1;
00054         }
00055 
00056         if (strtok_toargv(st, argv) < 1) {
00057                 mem_free(argv);
00058                 strtok_free(st);
00059                 return -1;
00060         }
00061 
00062         execvp(argv[0], argv);
00063 
00064         /* never get here */
00065         mem_free(argv);
00066         strtok_free(st);
00067         return -1;
00068 }

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