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 #include "mail.h"
  27 /*
  28  * isheader(lp, ctf) - check if lp is header line and return type
  29  *      lp      ->      pointer to line
  30  *      ctfp    ->      continuation flag (should be FALSE the first time
  31  *                      isheader() is called on a message.  isheader() sets
  32  *                      it for the remaining calls to that message)
  33  * returns
  34  *      FALSE   ->      not header line
  35  *      H_*     ->      type of header line found.
  36  */
  37 int
  38 isheader(lp, ctfp)
  39 char    *lp;
  40 int     *ctfp;
  41 {
  42         register char   *p, *q;
  43         register int    i;
  44
  45         p = lp;
  46         while ((*p) && (*p != '\n') && (isspace(*p))) {
  47                 p++;
  48         }
  49         if ((*p == '\0') || (*p == '\n')) {
  50                 /* blank line */
  51                 return (FALSE);
  52         }
  53
  54         if ((*ctfp) && ((*lp == ' ') || (*lp == '\t'))) {
  55                 return (H_CONT);
  56         }
  57
  58         *ctfp = FALSE;
  59         for (i = 1; i < H_CONT; i++) {
  60                 if (!isit(lp, i)) {
  61                         continue;
  62                 }
  63                 if ((i == H_FROM) || (i == H_FROM1)) {
  64                         /*
  65                          * Should NEVER get 'From ' or '>From ' line on stdin
  66                          * if invoked as mail (rather than rmail) since
  67                          * 'From ' and/or '>From ' lines are generated by
  68                          * program itself. Therefore, if it DOES match and
  69                          * ismail == TRUE, it must be part of the content.
  70                          */
  71                         if (sending && ismail && !deliverflag) {
  72                                 return (FALSE);
  73                         }
  74                 }
  75                 *ctfp = TRUE;
  76                 return (i);
  77         }
  78         /*
  79          * Check if name: value pair
  80          */
  81         if ((p = strpbrk(lp, ":")) != NULL) {
  82                 for (q = lp; q < p; q++)  {
  83                         if ((*q == ' ') || (!isprint(*q)))  {
  84                                 return (FALSE);
  85                         }
  86                 }
  87                 *ctfp = TRUE;
  88                 return (H_NAMEVALUE);
  89         }
  90         return (FALSE);
  91 }