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improve ctype.h macros to diagnose errors 

the casts of the argument to unsigned int suppressed diagnosis of
errors like passing a pointer instead of a character. putting the
actual function call in an unreachable branch restores any diagnostics
that would be present if the macros didn't exist and functions were
used.
This commit is contained in:
Rich Felker 2015-04-17 22:24:31 -04:00
parent 19bcdeeb1e
commit 2ca55a93f2
1 changed files with 6 additions and 6 deletions
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12
include/ctype.h
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@ -28,12 +28,12 @@ static __inline int __isspace(int _c)
return _c == ' ' || (unsigned)_c-'\t' < 5;
}
#define isalpha(a) ((((unsigned)(a)|32)-'a') < 26)
#define isdigit(a) (((unsigned)(a)-'0') < 10)
#define islower(a) (((unsigned)(a)-'a') < 26)
#define isupper(a) (((unsigned)(a)-'A') < 26)
#define isprint(a) (((unsigned)(a)-0x20) < 0x5f)
#define isgraph(a) (((unsigned)(a)-0x21) < 0x5e)
#define isalpha(a) (0 ? isalpha(a) : (((unsigned)(a)|32)-'a') < 26)
#define isdigit(a) (0 ? isdigit(a) : ((unsigned)(a)-'0') < 10)
#define islower(a) (0 ? islower(a) : ((unsigned)(a)-'a') < 26)
#define isupper(a) (0 ? isupper(a) : ((unsigned)(a)-'A') < 26)
#define isprint(a) (0 ? isprint(a) : ((unsigned)(a)-0x20) < 0x5f)
#define isgraph(a) (0 ? isgraph(a) : ((unsigned)(a)-0x21) < 0x5e)
#define isspace(a) __isspace(a)
#endif