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author | Christopher Faylor <cgf@redhat.com> | 2000-02-17 19:39:46 +0000 |
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committer | Christopher Faylor <cgf@redhat.com> | 2000-02-17 19:39:46 +0000 |
commit | 6d491d8ad9122891d1a48447e8c49702eb678921 (patch) | |
tree | 45619a131b9f211ceca9fce7a866328344bf00ec /newlib/libc/ctype/isalnum.c | |
parent | bd592806f45307757c24ec3f75bdefe13abfd51f (diff) | |
download | gdb-6d491d8ad9122891d1a48447e8c49702eb678921.tar.gz |
import newlib-2000-02-17 snapshotcvs/SNAPSHOT
Diffstat (limited to 'newlib/libc/ctype/isalnum.c')
-rw-r--r-- | newlib/libc/ctype/isalnum.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/newlib/libc/ctype/isalnum.c b/newlib/libc/ctype/isalnum.c new file mode 100644 index 00000000000..7e05bd1a249 --- /dev/null +++ b/newlib/libc/ctype/isalnum.c @@ -0,0 +1,46 @@ +/* +FUNCTION + <<isalnum>>---alphanumeric character predicate + +INDEX + isalnum + +ANSI_SYNOPSIS + #include <ctype.h> + int isalnum(int <[c]>); + +TRAD_SYNOPSIS + #include <ctype.h> + int isalnum(<[c]>); + + +DESCRIPTION +<<isalnum>> is a macro which classifies ASCII integer values by table +lookup. It is a predicate returning non-zero for alphabetic or +numeric ASCII characters, and <<0>> for other arguments. It is defined +for all integer values. + +You can use a compiled subroutine instead of the macro definition by +undefining the macro using `<<#undef isalnum>>'. + +RETURNS +<<isalnum>> returns non-zero if <[c]> is a letter (<<a>>--<<z>> or +<<A>>--<<Z>>) or a digit (<<0>>--<<9>>). + +PORTABILITY +<<isalnum>> is ANSI C. + +No OS subroutines are required. +*/ + +#include <_ansi.h> +#include <ctype.h> + +#undef isalnum + +int +_DEFUN(isalnum,(c),int c) +{ + return((_ctype_ + 1)[c] & (_U|_L|_N)); +} + |