Calling fscanf in C with a NULL stream pointer is a classic recipe for a . If you’re debugging an expression where fscanf is failing or behaving unexpectedly around null values, 1. The Anatomy of the Crash The prototype for fscanf is:
In C, fscanf is an expression that evaluates to an int . Understanding this value is critical for handling streams safely: Fscanf C Expression Stream Null
The number of items successfully matched and assigned. Zero: No items matched the format string. Calling fscanf in C with a NULL stream
Usually returned if the end of the input stream is reached or if a read error occurs before any conversion. Fscanf C Expression Stream Null