diff options
| author | Jim Meyering <jim@meyering.net> | 1996-12-18 03:22:56 +0000 |
|---|---|---|
| committer | Jim Meyering <jim@meyering.net> | 1996-12-18 03:22:56 +0000 |
| commit | 357c53621f5498b2e0eda31b3a04d98da57d7933 (patch) | |
| tree | 5c25212d9da7ce5121622181ffb4706ae76e63b3 /src | |
| parent | fd688bcc5fe15469e8a2ebaf7eddaba974aeab23 (diff) | |
| download | coreutils-357c53621f5498b2e0eda31b3a04d98da57d7933.tar.xz | |
(ISDIGIT): Replace with smaller, faster edition
that yields nonzero only on ASCII digits.
(ISDIGIT_LOCALE): New macro, with same meaning that ISDIGIT
used to have. From Paul Eggert.
Diffstat (limited to 'src')
| -rw-r--r-- | src/system.h | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/src/system.h b/src/system.h index c46451fc0..13634fe66 100644 --- a/src/system.h +++ b/src/system.h @@ -338,7 +338,6 @@ char *alloca (); #endif #define ISPRINT(c) (IN_CTYPE_DOMAIN (c) && isprint (c)) -#define ISDIGIT(c) (IN_CTYPE_DOMAIN (c) && isdigit (c)) #define ISALNUM(c) (IN_CTYPE_DOMAIN (c) && isalnum (c)) #define ISALPHA(c) (IN_CTYPE_DOMAIN (c) && isalpha (c)) #define ISCNTRL(c) (IN_CTYPE_DOMAIN (c) && iscntrl (c)) @@ -347,6 +346,17 @@ char *alloca (); #define ISSPACE(c) (IN_CTYPE_DOMAIN (c) && isspace (c)) #define ISUPPER(c) (IN_CTYPE_DOMAIN (c) && isupper (c)) #define ISXDIGIT(c) (IN_CTYPE_DOMAIN (c) && isxdigit (c)) +#define ISDIGIT_LOCALE(c) (IN_CTYPE_DOMAIN (c) && isdigit (c)) + +/* ISDIGIT differs from ISDIGIT_LOCALE, as follows: + - Its arg may be any int or unsigned int; it need not be an unsigned char. + - It's guaranteed to evaluate its argument exactly once. + - It's typically faster. + Posix 1003.2-1992 section 2.5.2.1 page 50 lines 1556-1558 says that + only '0' through '9' are digits. Prefer ISDIGIT to ISDIGIT_LOCALE unless + it's important to use the locale's definition of `digit' even when the + host does not conform to Posix. */ +#define ISDIGIT(c) ((unsigned) (c) - '0' <= 9) #ifndef __P #if defined (__GNUC__) || (defined (__STDC__) && __STDC__) |