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POrealloc(): invalid next size
 

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    <p>I'm having a problem with the realloc function. I'm using C only (so no vector) with LibCurl. The problem I'm having is that I'm getting the following error (realloc(): invalid next size) on the 12th iteration of the write_data function (the function I pass to Curl as a callback, it is called each time libcurl has some data to pass back (data is passed in chunks) ).</p> <h2>Trace:</h2> <p>-Removed-</p> <h2>Source:</h2> <pre><code>#include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; #include &lt;curl/curl.h&gt; #include &lt;string.h&gt; char * Data; //stores the data size_t RunningSize; int write_data( char *ptr, size_t size, size_t nmemb, void *stream ) { size_t ThisSize = (size * nmemb); //Stores the size of the data to be stored size_t DataLen = strlen( Data ); //length of the data so far RunningSize = (RunningSize + ThisSize ); //update running size (used as new size) Data = realloc( Data, RunningSize ); //get new mem location (on the 12th iteration, this fails) strcat( Data, ptr); //add data in ptr to Data return ThisSize; //the function must return the size of the data it received so cURL knows things went ok. } int main( ) { CURL *curl; CURLcode res; const char * UserAgent = ""; Data = malloc(1); //so realloc will work RunningSize += 1; curl = curl_easy_init(); if(curl) { curl_easy_setopt( curl, CURLOPT_NOBODY, 0 ); curl_easy_setopt( curl, CURLOPT_URL, "http://www.google.co.uk/" ); curl_easy_setopt( curl, CURLOPT_WRITEFUNCTION, write_data); curl_easy_setopt( curl, CURLOPT_USERAGENT, UserAgent ); curl_easy_setopt( curl, CURLOPT_HEADER, 1 ); //preform request. res = curl_easy_perform(curl); //output the data (debugging purposes) puts( Data ); //cleanup curl_easy_cleanup(curl); free(Data); } return 0; } </code></pre> <p>Thanks in advance,</p>
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    1. COWithout seeing your source code it's difficult to know what your table means and what's actually happening. Please put relevant source code in your question.
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    2. COWhat you posted into `pastebin` is virtually useless. There are no calls to `write_data` in your code, so there's no way to figure out what you are doing there.
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    3. CO@AndreyT: It's a callback, called from inside libcurl.
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