usr/src/lib/libmail/common/setup_exec.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  28 /*        All Rights Reserved   */
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"
  31
  32 #include <sys/types.h>
  33 #include <ctype.h>
  34 #include "libmail.h"
  35
  36 #define TRUE    1
  37 #define FALSE   0
  38
  39 char **
  40 setup_exec(char *s)
  41 {
  42         char    *p = s, *q;
  43         static char     *argvec[256]; /* is this enough? */
  44         int     i = 0;
  45         int     stop;
  46         int     ignorespace = FALSE;
  47
  48         /* Parse up string into arg. vec. for subsequent exec. Assume */
  49         /* whitespace delimits args. Any non-escaped double quotes will */
  50         /* be used to group multiple whitespace-delimited tokens into */
  51         /* a single exec arg. */
  52         p = skipspace(p);
  53         while (*p) {
  54                 q = p;
  55                 stop = FALSE;
  56                 while (*q && (stop == FALSE)) {
  57                 again:
  58                         switch (*q) {
  59                         case '\\':
  60                                 /* Slide command string 1 char to left */
  61                                 strmove(q, q+1);
  62                                 break;
  63                         case '"':
  64                                 ignorespace = ((ignorespace == TRUE) ?
  65                                     FALSE : TRUE);
  66                                 /* Slide command string 1 char to left */
  67                                 strmove(q, q+1);
  68                                 goto again;
  69                         default:
  70                                 if (isspace((int)*q) &&
  71                                     (ignorespace == FALSE)) {
  72                                         stop = TRUE;
  73                                         continue;
  74                                 }
  75                                 break;
  76                         }
  77                         q++;
  78                 }
  79                 if (*q == '\0') {
  80                         argvec[i++] = p;
  81                         break;
  82                 }
  83                 *q++ = '\0';
  84                 argvec[i++] = p;
  85                 p = skipspace(q);
  86         }
  87         argvec[i] = NULL;
  88         if (i == 0) {
  89                 return (NULL);
  90         }
  91         return (argvec);
  92 }