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| author | Jim Meyering <jim@meyering.net> | 1996-12-18 03:30:20 +0000 |
|---|---|---|
| committer | Jim Meyering <jim@meyering.net> | 1996-12-18 03:30:20 +0000 |
| commit | 72f95044eb4fe9f1e22c2de876850d6b988f8a7b (patch) | |
| tree | e5d2ee29f6f046356653537f20d9cb97fed9baa9 /lib | |
| parent | 859f8587f822517d64c7298cd61bc04218c280c1 (diff) | |
| download | coreutils-72f95044eb4fe9f1e22c2de876850d6b988f8a7b.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 'lib')
| -rw-r--r-- | lib/backupfile.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/lib/backupfile.c b/lib/backupfile.c index 1698c3474..2ca512532 100644 --- a/lib/backupfile.c +++ b/lib/backupfile.c @@ -68,8 +68,17 @@ char *malloc (); # define IN_CTYPE_DOMAIN(c) isascii(c) #endif -#define ISDIGIT(c) (IN_CTYPE_DOMAIN ((unsigned char) (c)) \ - && isdigit ((unsigned char) (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) #if defined (HAVE_UNISTD_H) #include <unistd.h> |