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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.
*/
/* chrarg -- parse character and return its index
*
* Usage: i = chrarg (ptr,brk,prompt,legals,defalt);
* int i;
* char **ptr,*brk,*prompt,*legals,defalt;
*
* Chrarg will parse an argument from the string pointed to by "ptr",
* bumping ptr to point to the next argument. The first character
* of the arg will be searched for in "legals", and its index
* returned; if it is not found, or if there is no argument, then
* getchr() will be used to ask the user for a character.
* "Brk" is the list of characters which may terminate an argument;
* if it is 0, then " " is used.
*
* HISTORY
* $Log: chrarg.c,v $
* Revision 1.2 90/12/11 17:50:49 mja
* Add copyright/disclaimer for distribution.
*
* 28-Apr-85 Steven Shafer (sas) at Carnegie-Mellon University
* Modified for 4.2 BSD. Now puts output on stderr.
*
* 20-Nov-79 Steven Shafer (sas) at Carnegie-Mellon University
* Rewritten for VAX.
*
*/
#include <stdio.h>
int strcmp(), getchr();
char *index(),*nxtarg();
int chrarg (ptr,brk,prompt,legals,defalt)
char **ptr, *brk, *prompt, *legals, defalt;
{
register int i;
register char *arg,*p;
i = -1; /* bogus value */
fflush (stdout);
arg = nxtarg (ptr,brk); /* parse argument */
if (*arg) { /* there was an arg */
p = index (legals,*arg);
if (p) {
i = p - legals;
}
else if (strcmp("?",arg) != 0) {
fprintf (stderr,"%s: not valid. ",arg);
}
}
if (i < 0) {
i = getchr (prompt,legals,defalt);
}
return (i);
}
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