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…rns in process_line() process_line() was using EXIT_SUCCESS (0) to signal errors and EXIT_FAILURE (1) to signal success. While the numeric logic happened to work with the caller's !process_line() check, the macro semantics were inverted, creating a maintenance trap for future developers. Replace with plain 0 (failure) and 1 (success) literals to match the intended boolean semantics.
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…rns in process_line()
process_line() was using EXIT_SUCCESS (0) to signal errors and EXIT_FAILURE (1) to signal success. While the numeric logic happened to work with the caller's !process_line() check, the macro semantics were inverted, creating a maintenance trap for future developers.
Replace with plain 0 (failure) and 1 (success) literals to match the intended boolean semantics.