lib/libc/posix/_execlp.c

   1 /*-
   2  * Copyright (c) 1991, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #define execlp _execlp
  31 #define execvp _execvp
  32 #include <unistd.h>
  33 #include <minix/compiler.h>
  34 #include <errno.h>
  35 #include <stdarg.h>
  36 #include <sys/types.h>
  37 #include <stdlib.h>
  38 #include <alloca.h>
  39 #include <lib.h>
  40
  41 #ifndef __UNCONST
  42 #define __UNCONST(x) ((void *) (x))
  43 #endif
  44
  45 int execlp(const char *file, const char *arg1, ...)
  46 /* execlp("sh", "sh", "-c", "example", (char *) 0); */
  47 {
  48 #if FUNC_ARGS_ARRAY
  49   /*
  50         * execlp() - execute with PATH search
  51         * Author: Kees J. Bot, 22 Jan 1994
  52         */
  53         return execvp(file, (char * const *) &arg1);
  54 #else
  55         va_list ap;
  56         char **argv;
  57         int i;
  58
  59         va_start(ap, arg1);
  60         for (i = 2; va_arg(ap, char *) != NULL; i++)
  61                 continue;
  62         va_end(ap);
  63
  64         if ((argv = alloca(i * sizeof (char *))) == NULL) {
  65                 errno = ENOMEM;
  66                 return -1;
  67         }
  68
  69         va_start(ap, arg1);
  70         argv[0] = __UNCONST(arg1);
  71         for (i = 1; (argv[i] = va_arg(ap, char *)) != NULL; i++)
  72                 continue;
  73         va_end(ap);
  74
  75         return execvp(file, (char * const *)argv);
  76 #endif
  77 }