diff options
Diffstat (limited to 'posix/execlp.c')
| -rw-r--r-- | posix/execlp.c | 59 |
1 files changed, 41 insertions, 18 deletions
diff --git a/posix/execlp.c b/posix/execlp.c index f442c05..76b878e 100644 --- a/posix/execlp.c +++ b/posix/execlp.c @@ -1,24 +1,25 @@ -/* Copyright (C) 1991, 1993, 1996 Free Software Foundation, Inc. -This file is part of the GNU C Library. +/* Copyright (C) 1991, 1993, 1996, 1997 Free Software Foundation, Inc. + This file is part of the GNU C Library. -The GNU C Library is free software; you can redistribute it and/or -modify it under the terms of the GNU Library General Public License as -published by the Free Software Foundation; either version 2 of the -License, or (at your option) any later version. + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. -The GNU C Library is distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU -Library General Public License for more details. + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. -You should have received a copy of the GNU Library General Public -License along with the GNU C Library; see the file COPYING.LIB. If -not, write to the Free Software Foundation, Inc., 675 Mass Ave, -Cambridge, MA 02139, USA. */ + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ #include <unistd.h> #include <stdarg.h> #include <stddef.h> +#include <string.h> /* Execute FILE, searching in the `PATH' environment variable if it contains no slashes, with all arguments after FILE until a @@ -26,16 +27,38 @@ Cambridge, MA 02139, USA. */ int execlp (const char *file, const char *arg, ...) { - const char *argv[1024]; + size_t argv_max = 1024; + const char **argv = alloca (argv_max * sizeof (const char *)); unsigned int i; va_list args; + argv[0] = arg; + va_start (args, arg); + i = 1; + do + { + if (i == argv_max) + { + const char **nptr = alloca ((argv_max *= 2) * sizeof (const char *)); - argv[i = 0] = arg; - while (argv[i++] != NULL) - argv[i] = va_arg (args, const char *); + if ((char *) nptr + argv_max == (char *) argv) + { + /* Stack grows down. */ + argv = (const char **) memcpy (nptr, argv, i); + argv_max += i; + } + else if ((char *) argv + i == (char *) nptr) + /* Stack grows up. */ + argv_max += i; + else + /* We have a hole in the stack. */ + argv = (const char **) memcpy (nptr, argv, i); + } + argv[i] = va_arg (args, const char *); + } + while (argv[i++] != NULL); va_end (args); return execvp (file, (char *const *) argv); |