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researchv10 Dan Cross

.\"#ident	"@(#)ccsman:g3c/conv	1.2"
'\"macro stdmacro
.nr X
.if \nX=0 .ds x} CONV 3L "630 MTG" "\&"
.TH \*(x}
.SH NAME
conv: toupper, tolower, _toupper, _tolower, toascii \- translate characters
.SH SYNOPSIS
.nf
.B #include <ccs/ctype.h>
.PP
.B int toupper (c)
.B int c;
.PP
.B int tolower (c)
.B int c;
.PP
.B int _toupper (c)
.B int c;
.PP
.B int _tolower (c)
.B int c;
.PP
.B int toascii (c)
.B int c;
.SH DESCRIPTION
.I Toupper\^
and
.I tolower\^
have as domain the range of
.IR jx (1)
.IR getc :
the integers from \-1 through 255.
If the argument of
.I toupper\^
represents a lower-case letter, the
result is the corresponding upper-case
letter.
If the argument of
.I tolower\^
represents an upper-case letter, the
result is the corresponding lower-case
letter.
All other arguments in the domain are
returned unchanged.
.PP
The macros
.I _toupper\^
and
.IR _tolower ,
are macros that accomplish the same thing as
.I toupper\^
and
.I tolower\^
but have restricted domains and are faster.
.I _toupper\^
requires a lower-case letter as its argument;
its result is the corresponding upper-case letter.
The macro
.I _tolower\^
requires an upper-case letter as its argument;
its result is the corresponding lower-case letter.
Arguments outside the domain cause undefined results.
.PP
.I Toascii\^
yields its argument with all bits turned off that are not
part of a standard
.SM ASCII
character; it is intended for compatibility
with other systems.
.SH SEE ALSO
jx(1),
ctype(3L),
ascii(5).
.Ee

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