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    1: /***************************************************************************
    2:  *                                  _   _ ____  _
    3:  *  Project                     ___| | | |  _ \| |
    4:  *                             / __| | | | |_) | |
    5:  *                            | (__| |_| |  _ <| |___
    6:  *                             \___|\___/|_| \_\_____|
    7:  *
    8:  * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
    9:  *
   10:  * This software is licensed as described in the file COPYING, which
   11:  * you should have received as part of this distribution. The terms
   12:  * are also available at https://curl.haxx.se/docs/copyright.html.
   13:  *
   14:  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
   15:  * copies of the Software, and permit persons to whom the Software is
   16:  * furnished to do so, under the terms of the COPYING file.
   17:  *
   18:  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
   19:  * KIND, either express or implied.
   20:  *
   21:  ***************************************************************************/
   22: 
   23: #include "curl_setup.h"
   24: 
   25: #include <curl/curl.h>
   26: 
   27: #include "strdup.h"
   28: #include "curl_memory.h"
   29: 
   30: /* The last #include file should be: */
   31: #include "memdebug.h"
   32: 
   33: #ifndef HAVE_STRDUP
   34: char *curlx_strdup(const char *str)
   35: {
   36:   size_t len;
   37:   char *newstr;
   38: 
   39:   if(!str)
   40:     return (char *)NULL;
   41: 
   42:   len = strlen(str);
   43: 
   44:   if(len >= ((size_t)-1) / sizeof(char))
   45:     return (char *)NULL;
   46: 
   47:   newstr = malloc((len + 1)*sizeof(char));
   48:   if(!newstr)
   49:     return (char *)NULL;
   50: 
   51:   memcpy(newstr, str, (len + 1)*sizeof(char));
   52: 
   53:   return newstr;
   54: 
   55: }
   56: #endif
   57: 
   58: /***************************************************************************
   59:  *
   60:  * Curl_memdup(source, length)
   61:  *
   62:  * Copies the 'source' data to a newly allocated buffer (that is
   63:  * returned). Copies 'length' bytes.
   64:  *
   65:  * Returns the new pointer or NULL on failure.
   66:  *
   67:  ***************************************************************************/
   68: void *Curl_memdup(const void *src, size_t length)
   69: {
   70:   void *buffer = malloc(length);
   71:   if(!buffer)
   72:     return NULL; /* fail */
   73: 
   74:   memcpy(buffer, src, length);
   75: 
   76:   return buffer;
   77: }
   78: 
   79: /***************************************************************************
   80:  *
   81:  * Curl_saferealloc(ptr, size)
   82:  *
   83:  * Does a normal realloc(), but will free the data pointer if the realloc
   84:  * fails. If 'size' is non-zero, it will free the data and return a failure.
   85:  *
   86:  * This convenience function is provided and used to help us avoid a common
   87:  * mistake pattern when we could pass in a zero, catch the NULL return and end
   88:  * up free'ing the memory twice.
   89:  *
   90:  * Returns the new pointer or NULL on failure.
   91:  *
   92:  ***************************************************************************/
   93: void *Curl_saferealloc(void *ptr, size_t size)
   94: {
   95:   void *datap = realloc(ptr, size);
   96:   if(size && !datap)
   97:     /* only free 'ptr' if size was non-zero */
   98:     free(ptr);
   99:   return datap;
  100: }