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Annotation of embedaddon/curl/lib/strdup.c, revision 1.1.1.1

1.1       misho       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: }