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authorProjectRevoTPP <projectrevotpp@hotmail.com>2017-12-20 16:34:35 -0500
committerProjectRevoTPP <projectrevotpp@hotmail.com>2017-12-20 16:34:35 -0500
commit48ef7704c03e7e554c05de01bf8d1d70c16cb6f4 (patch)
tree34d52513de6c903b4f52ef87d885c73472daf469 /libc/ctype/isupper.c
parentf49e7cbb33e6e27b0ce5eb35244d7241c800a7c1 (diff)
add libc building to agbcc.
Diffstat (limited to 'libc/ctype/isupper.c')
-rw-r--r--libc/ctype/isupper.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/libc/ctype/isupper.c b/libc/ctype/isupper.c
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+
+/*
+FUNCTION
+<<isupper>>---uppercase character predicate
+
+INDEX
+isupper
+
+ANSI_SYNOPSIS
+#include <ctype.h>
+int isupper(int <[c]>);
+
+TRAD_SYNOPSIS
+#include <ctype.h>
+int isupper(<[c]>);
+
+DESCRIPTION
+<<isupper>> is a macro which classifies ASCII integer values by table
+lookup. It is a predicate returning non-zero for upper-case letters
+(<<A>>--<<Z>>), and 0 for other characters. 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 isupper>>'.
+
+RETURNS
+<<isupper>> returns non-zero if <[c]> is a upper case letter (A-Z).
+
+PORTABILITY
+<<isupper>> is ANSI C.
+
+No supporting OS subroutines are required.
+*/
+#include <_ansi.h>
+#include <ctype.h>
+
+#undef isupper
+int
+_DEFUN(isupper,(c),int c)
+{
+ return((_ctype_ + 1)[c] & _U);
+}
+