src/plugins/pgpcore/pgp_utils.c

   1 /*
   2  * Claws Mail -- a GTK based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2013 Colin Leroy <colin@colino.net> and
   4  * the Claws Mail team
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  18  *
  19  */
  20
  21 #ifdef HAVE_CONFIG_H
  22 #  include "config.h"
  23 #include "claws-features.h"
  24 #endif
  25
  26 #ifdef USE_GPGME
  27
  28 #include <glib.h>
  29 #include <string.h> /* for strlen */
  30 #include <stdio.h> /* for strstr */
  31
  32 /* It's only a valid armor header if it's at the
  33  * beginning of the buffer or a new line, and if
  34  * there is only whitespace after it on the rest
  35  * of the line. */
  36 gchar *pgp_locate_armor_header(const gchar *haystack, const gchar *needle)
  37 {
  38         gchar *txt, *x, *i;
  39         gint ok;
  40
  41         g_return_val_if_fail(haystack != NULL, NULL);
  42         g_return_val_if_fail(needle != NULL, NULL);
  43
  44         /* Start at the beginning */
  45         txt = (gchar *)haystack;
  46         while (*txt != '\0') {
  47
  48                 /* Find next occurrence */
  49                 x = strstr(txt, needle);
  50
  51                 if (x == NULL)
  52                         break;
  53
  54                 /* Make sure that what we found is at the beginning of line */
  55                 if (x != haystack && *(x - 1) != '\n') {
  56                         txt = x + 1;
  57                         continue;
  58                 }
  59
  60                 /* Now look at what's between end of needle and end of that line.
  61                  * If there is anything else than whitespace, stop looking. */
  62                 i = x + strlen(needle);
  63                 ok = 1;
  64                 while (*i != '\0' && *i != '\r' && *i != '\n') {
  65                         if (!g_ascii_isspace(*i)) {
  66                                 ok = 0;
  67                                 break;
  68                         }
  69                         i++;
  70                 }
  71
  72                 if (ok)
  73                         return x;
  74
  75                 /* We are at the end of haystack */
  76                 if (*i == '\0')
  77                         return NULL;
  78
  79                 txt = i + 1;
  80         }
  81
  82         return NULL;
  83 }
  84
  85 #endif /* USE_GPGME */