Buffer probs

This call:

Code:

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strncpy(entry_buf, strstr(file_buf, sought_buf), MAX_ENTRY_LEN);

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Would that fail in any way if one of the buffers are empty? I get a runtime error (the infamour XP runtime error dialog).

Well if strstr() doesn't find anything, then you're in doo-doo because it returns a NULL pointer.
Plus strncpy() doesn't always append a \0 to the string, so if you're assuming that as well, then that could be another problem.

Assuming of course that you've allocated the amount of space you say you have.