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author | Christopher Faylor <me+cygwin@cgf.cx> | 2000-02-17 19:39:46 +0000 |
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committer | Christopher Faylor <me+cygwin@cgf.cx> | 2000-02-17 19:39:46 +0000 |
commit | 43b55bace5fad27af5da7a99784667363b92c45d (patch) | |
tree | 17fe82f6ba0d93b76d10dd73d4945ab81b69db40 /newlib/libc/ctype/isalpha.c | |
parent | 8dabd7496a9eeaca2a7180c0a176059ba9229bb2 (diff) | |
download | gdb-SNAPSHOT.tar.gz |
import newlib-2000-02-17 snapshotnewlib-2000-02-17SNAPSHOT
Diffstat (limited to 'newlib/libc/ctype/isalpha.c')
-rw-r--r-- | newlib/libc/ctype/isalpha.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/newlib/libc/ctype/isalpha.c b/newlib/libc/ctype/isalpha.c new file mode 100644 index 00000000000..35f14d3969b --- /dev/null +++ b/newlib/libc/ctype/isalpha.c @@ -0,0 +1,44 @@ +/* +FUNCTION + <<isalpha>>---alphabetic character predicate + +INDEX + isalpha + +ANSI_SYNOPSIS + #include <ctype.h> + int isalpha(int <[c]>); + +TRAD_SYNOPSIS + #include <ctype.h> + int isalpha(<[c]>); + +DESCRIPTION +<<isalpha>> is a macro which classifies ASCII integer values by table +lookup. It is a predicate returning non-zero when <[c]> represents an +alphabetic ASCII character, and 0 otherwise. It is defined only when +<<isascii>>(<[c]>) is true or <[c]> is EOF. + +You can use a compiled subroutine instead of the macro definition by +undefining the macro using `<<#undef isalpha>>'. + +RETURNS +<<isalpha>> returns non-zero if <[c]> is a letter (<<A>>--<<Z>> or +<<a>>--<<z>>). + +PORTABILITY +<<isalpha>> is ANSI C. + +No supporting OS subroutines are required. +*/ + +#include <_ansi.h> +#include <ctype.h> + +#undef isalpha +int +_DEFUN(isalpha,(c),int c) +{ + return((_ctype_ + 1)[c] & (_U|_L)); +} + |