usr/src/cmd/mail/isheader.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 1.    */
  27 #include "mail.h"
  28 /*
  29  * isheader(lp, ctf) - check if lp is header line and return type
  30  *      lp      ->      pointer to line
  31  *      ctfp    ->      continuation flag (should be FALSE the first time
  32  *                      isheader() is called on a message.  isheader() sets
  33  *                      it for the remaining calls to that message)
  34  * returns
  35  *      FALSE   ->      not header line
  36  *      H_*     ->      type of header line found.
  37  */
  38 int
  39 isheader(lp, ctfp)
  40 char    *lp;
  41 int     *ctfp;
  42 {
  43         register char   *p, *q;
  44         register int    i;
  45
  46         p = lp;
  47         while((*p) && (*p != '\n') && (isspace(*p))) {
  48                 p++;
  49         }
  50         if((*p == NULL) || (*p == '\n')) {
  51                 /* blank line */
  52                 return (FALSE);
  53         }
  54
  55         if ((*ctfp) && ((*lp == ' ') || (*lp == '\t'))) {
  56                 return(H_CONT);
  57         }
  58
  59         *ctfp = FALSE;
  60         for (i = 1; i < H_CONT; i++) {
  61                 if (!isit(lp, i)) {
  62                         continue;
  63                 }
  64                 if ((i == H_FROM) || (i == H_FROM1)) {
  65                         /*
  66                          * Should NEVER get 'From ' or '>From ' line on stdin
  67                          * if invoked as mail (rather than rmail) since
  68                          * 'From ' and/or '>From ' lines are generated by
  69                          * program itself. Therefore, if it DOES match and
  70                          * ismail == TRUE, it must be part of the content.
  71                          */
  72                         if (sending && ismail && !deliverflag) {
  73                                 return (FALSE);
  74                         }
  75                 }
  76                 *ctfp = TRUE;
  77                 return (i);
  78         }
  79         /*
  80          * Check if name: value pair
  81          */
  82         if ((p = strpbrk(lp, ":")) != NULL ) {
  83                 for(q = lp; q < p; q++)  {
  84                         if ((*q == ' ') || (!isprint(*q)))  {
  85                                 return(FALSE);
  86                         }
  87                 }
  88                 *ctfp = TRUE;
  89                 return(H_NAMEVALUE);
  90         }
  91         return(FALSE);
  92 }