bugidutils - Bugs: bug #44982, Incorrectly formed calls to...


bug #44982: Incorrectly formed calls to <ctype.h> functions

Submitter:  None
Submitted:  Fri 01 May 2015 05:25:49 PM UTC
Category:  None Severity:  3 - Normal
Item Group:  None Status:  None
Privacy:  Public Assigned to:  None
Open/Closed:  Open
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Fri 01 May 2015 05:25:49 PM UTC, original submission:  

libidu/scanners.c and src/lid.c contain multiple calls to Standard C Library entries from the <ctype.h> group: isdigit(), isspace(), isxdigit(), islower() and isalnum().

These functions work on characters, yet their argument type is int, and actual input is required to be either values <i>representable as unsigned char</i>, or EOF.  If you want to pass a generic char argument to any of these functions, it <b>must</b> be cast to unsigned char first.  On platforms where char == unsigned char, that might work all by itself, but that's not something portable code may assume.



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