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    <p>The chances are that (a) <code>response</code> is not initialized and (b) the <code>read()</code> function did not get to read a terminating null in the string. To demonstrate, use:</p> <pre><code>int rc = read(sockfd, response, sizeof(response)); printf("The response is: %.*\n", rc, response); </code></pre> <p>You should really check that <code>rc</code> is neither negative (a read failure) nor zero (EOF) before using it in the <code>printf()</code> statement, and you need to null terminate before passing it to <code>strtok()</code> et al, so maybe a better treatment is:</p> <pre><code>int rc = read(sockfd, response, sizeof(response)-1); if (rc &lt;= 0) ...error or EOF... response[rc] = '\0'; </code></pre> <hr> <blockquote> <p>I still get the error...</p> </blockquote> <p>You've marked the code where the error occurs at:</p> <pre><code>char *pch; pch = strtok(response, "\n"); printf("Part 1 -&gt; %s\n\n", pch); // ERROR </code></pre> <p>The most plausible reason for a core dump there is that <code>pch</code> contains a null pointer. So, to protect yourself, test the result from <code>strtok()</code>:</p> <pre><code>char *pch = strtok(response, "\n"); if (pch == 0) printf("strtok() failed\n"); else printf("Part 1 -&gt; %s\n\n", pch); </code></pre> <p>You should make sure that if <code>pch</code> is null, you don't continue using it.</p> <p>You didn't show the declaration of <code>rc</code>; if it was <code>unsigned char rc</code>, then the 255 value might indicate a -1 returned from the <code>read()</code> call.</p> <p>Also, the code I showed assumes that the definition of <code>response()</code> is visible as an array (either at file scope or function scope, not as a parameter to a function). When the array is a function parameter, <code>sizeof(response)</code> returns the same value as <code>sizeof(char *)</code>, which is not the size of the array in general.</p>
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    1. USJonathan Leffler
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