usr/src/cmd/mail/getarg.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, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  23 /*        All Rights Reserved   */
  24
  25
  26 #pragma ident   "%Z%%M% %I%     %E% SMI"        /* SVr4.0 2.    */
  27 #include "mail.h"
  28 /*
  29         get next token
  30                 p       -> string to be searched
  31                 s       -> area to return token
  32         returns:
  33                 p       -> updated string pointer
  34                 s       -> token
  35                 NULL    -> no token
  36 */
  37 char *
  38 getarg(s, p)
  39 register char *s, *p;
  40 {
  41         while (*p == ' ' || *p == '\t') p++;
  42         if (*p == '\n' || *p == '\0') return(NULL);
  43         while (*p != ' ' && *p != '\t' && *p != '\n' && *p != '\0') *s++ = *p++;
  44         *s = '\0';
  45         return(p);
  46 }