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Integer overflow: strtol returns long, but the result is cast directly to int, which can overflow silently.
Line length overflow: While fgets does limit the buffer, a line without a newline may not be properly null-terminated or fully read.
Unvalidated input to strtol: If input is like "123abc", it will partially parse and accept 123 unless extra checks are added.
Locale issues: strtol can behave differently under different locales for whitespace/formatting.