text: /*
   * %CopyrightBegin%
   *
   * Copyright Ericsson AB 2008-2009. All Rights Reserved.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   *
   * %CopyrightEnd%
   */
  /*
   * Module: safe_string.c
   *
   * This is a bunch of generic string operation
   * that are safe regarding buffer overflow.
   *
   * All string functions terminate the process with an error message
   * on buffer overflow.
   */
  
  #ifdef HAVE_CONFIG_H
  #  include "config.h"
  #endif
  #include "safe_string.h"
  #include <stdio.h>
  #include <string.h>
  #include <stdarg.h>
  #include <stdlib.h>
  
  
  static void string_overflow_handler(const char* format, ...)
  {
      va_list args;
      va_start(args, format);
      vfprintf(stderr,format,args);
      va_end(args);
      exit(1);
  }
  
  int vsn_printf(char* dst, size_t size, const char* format, va_list args)
  {
      int ret = vsnprintf(dst, size, format, args);
      if (ret >= size || ret < 0) {
  	string_overflow_handler("Buffer truncated '%s'\n",dst);
      }
      return ret;
  }
  
  int sn_printf(char* dst, size_t size, const char* format, ...)
  {
      va_list args;
      int ret;
      va_start(args, format);
      ret = vsn_printf(dst,size,format,args);
      va_end(args);
      return ret;
  }
  
  int strn_cpy(char* dst, size_t size, const char* src)
  {
      return sn_printf(dst,size,"%s",src);
  }
  
  int strn_cat(char* dst, size_t size, const char* src)
  {
      return strn_catf(dst,size,"%s",src);
  }
  
  int strn_catf(char* dst, size_t size, const char* format, ...)
  {
      int ret;
      va_list args;
  #ifdef _GNU_SOURCE
      int len = strnlen(dst,size);
  #else
      int len = strlen(dst);
  #endif
  
      if (len >= size) {
  	string_overflow_handler("Buffer already overflowed '%.*s'\n",
  				size, dst);
      }
      va_start(args, format);
      ret = vsn_printf(dst+len, size-len, format, args);
      va_end(args);
      return len+ret;
  }
  
  char* find_str(const char* haystack, int hsize, const char* needle)
  {
      int i = 0;
      int nsize = strlen(needle);
      hsize -= nsize - 1;
      for (i=0; i<hsize; i++) {
  	if (haystack[i]==needle[0] && strncmp(haystack+i,needle,nsize)==0) {
  	    return (char*)(haystack+i);
  	}
      }
      return NULL;
  }
  
  #ifndef HAVE_MEMMOVE
  void* memmove(void *dest, const void *src, size_t n)
  {
      int i;
      if (src > dest) {
  	for (i=0; i<n; i++) ((char*)dest)[i] = ((char*)src)[i];
      }
      else {
  	for (i=(int)(n-1); i>=0; i--) ((char*)dest)[i] = ((char*)src)[i];
      }
      return dest;
  }
  #endif /* HAVE_MEMMOVE */
  