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/*
* Copyright (c) 1990 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND CARNEGIE MELLON UNIVERSITY
* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT
* SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
* CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Users of this software agree to return to Carnegie Mellon any
* improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*
* Export of this software is permitted only after complying with the
* regulations of the U.S. Deptartment of Commerce relating to the
* Export of Technical Data.
*/
/* fold -- perform case folding
*
* Usage: p = foldup (out,in);
* p = folddown (out,in);
* char *p,*in,*out;
*
* Fold performs case-folding, moving string "in" to
* "out" and folding one case to another en route.
* Folding may be upper-to-lower case (folddown) or
* lower-to-upper case.
* Foldup folds to upper case; folddown folds to lower case.
* The same string may be specified as both "in" and "out".
* The address of "out" is returned for convenience.
*
**********************************************************************
* HISTORY
* $Log: fold.c,v $
* Revision 1.2 90/12/11 17:53:16 mja
* Add copyright/disclaimer for distribution.
*
* 23-Sep-86 Glenn Marcy (gm0w) at Carnegie-Mellon University
* Unexported original fold routine.
*
* 20-Nov-79 Steven Shafer (sas) at Carnegie-Mellon University
* Rewritten for VAX. The foldup() and folddown() routines
* are new.
*
**********************************************************************
*/
typedef enum {FOLDUP, FOLDDOWN} FOLDMODE;
static
char *fold (out,in,whichway)
char *in,*out;
FOLDMODE whichway;
{
register char *i,*o;
register char lower;
char upper;
int delta;
switch (whichway)
{
case FOLDUP:
lower = 'a'; /* lower bound of range to change */
upper = 'z'; /* upper bound of range */
delta = 'A' - 'a'; /* amount of change */
break;
case FOLDDOWN:
lower = 'A';
upper = 'Z';
delta = 'a' - 'A';
}
i = in;
o = out;
do {
if (*i >= lower && *i <= upper) *o++ = *i++ + delta;
else *o++ = *i++;
}
while (*i);
*o = '\0';
return (out);
}
char *foldup (out,in)
char *in,*out;
{
return (fold(out,in,FOLDUP));
}
char *folddown (out,in)
char *in,*out;
{
return (fold(out,in,FOLDDOWN));
}
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