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C Programming: strcpy

Posted on 2013-10-27
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Last Modified: 2013-10-28
Why is the code below wrong? It says that strlen() is 4, and printing "req" gives empty string.

char *req = malloc( sizeof(char) * 200);
strcpy(req, "GET ");
strcpy(req, request);
strcpy(req, " HTTP/1.1\r\nHOST: ");
strcpy(req, hostName);
strcpy(req, "\r\n\r\n");

fprintf(fp, "%d\n", strlen(req));
fprintf(fp, "%s\n", req);

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Question by:pzozulka
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Dave Baldwin earned 2000 total points
ID: 39604830
The way you're doing that, you're writing over the characters each time and the last time, "\r\n\r\n", is 4 characters long but they're all control characters.  After the first 'strcpy', you probably want to use 'strcat' to add the remaining characters to the string.
http://man7.org/linux/man-pages/man3/strncat.3.html
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