lib/gnutls_str.c

   1 /*
   2  *      Copyright (C) 2002 Nikos Mavroyanopoulos
   3  *
   4  * This file is part of GNUTLS.
   5  *
   6  *  The GNUTLS library is free software; you can redistribute it and/or
   7  *  modify it under the terms of the GNU Lesser General Public
   8  *  License as published by the Free Software Foundation; either
   9  *  version 2.1 of the License, or (at your option) any later version.
  10  *
  11  *  This library 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 GNU
  14  *  Lesser General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU Lesser General Public
  17  *  License along with this library; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
  19  *
  20  */
  21
  22 #include <gnutls_int.h>
  23 #include <gnutls_errors.h>
  24 #include <gnutls_num.h>
  25
  26 /* These function are like strcat, strcpy. They only
  27  * do bound checking (they shouldn't cause buffer overruns),
  28  * and they always produce null terminated strings.
  29  *
  30  * They should be used only with null terminated strings.
  31  */
  32 void _gnutls_str_cat( char* dest, size_t dest_tot_size, const char* src) {
  33 size_t str_size = strlen(src);
  34 size_t dest_size = strlen(dest);
  35
  36         if ( dest_tot_size - dest_size > str_size) {
  37                 strcat( dest, src);
  38         } else {
  39                 if ( dest_tot_size - dest_size > 0) {
  40                         strncat( dest, src, (dest_tot_size - dest_size) -1);
  41                         dest[dest_tot_size-1] = 0;
  42                 }
  43         }
  44 }
  45
  46 void _gnutls_str_cpy( char* dest, size_t dest_tot_size, const char* src) {
  47 size_t str_size = strlen(src);
  48
  49         if ( dest_tot_size > str_size) {
  50                 strcpy( dest, src);
  51         } else {
  52                 if ( dest_tot_size > 0) {
  53                         strncpy( dest, src, (dest_tot_size) -1);
  54                         dest[dest_tot_size-1] = 0;
  55                 }
  56         }
  57 }
  58
  59 void _gnutls_mem_cpy( char* dest, size_t dest_tot_size, const char* src, size_t src_size)
  60 {
  61
  62         if ( dest_tot_size >= src_size) {
  63                 memcpy( dest, src, src_size);
  64         } else {
  65                 if ( dest_tot_size > 0) {
  66                         memcpy( dest, src, dest_tot_size);
  67                 }
  68         }
  69 }