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o kill register
o lots of KNF
o passes -Wall
o fix some [ug]id_t vs. int issues
o use strlcpy/strlcat in favor of strncpy/strncat
o use mem* routines everywhere instead of old b* ones
o marked several questionable things for later fixing
o kill ci.c and cvt.c -- we don't use them
o kill read_line.c since it requires fgetln() (bad for portability)
o kill salloc.c since it is the same as strup()
o Replaced some #ifdef __OpenBSD__ with better tests
o remaining problems: malloc return values are rarely checked, select misuse

/*	$OpenBSD: nxtarg.c,v 1.5 2001/05/04 22:16:15 millert Exp $	*/

/*
 * Copyright (c) 1991 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.
 *
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 *
 * Carnegie Mellon requests users of this software to return to
 *
 *  Software Distribution Coordinator   or   Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 *
 * any improvements or extensions that they make and grant Carnegie the rights
 * to redistribute these changes.
 */
/*
 *  nxtarg -- strip off arguments from a string
 *
 *  Usage:  p = nxtarg (&q,brk);
 *	char *p,*q,*brk;
 *	extern char _argbreak;
 *
 *	q is pointer to next argument in string
 *	after call, p points to string containing argument,
 *	q points to remainder of string
 *
 *  Leading blanks and tabs are skipped; the argument ends at the
 *  first occurence of one of the characters in the string "brk".
 *  When such a character is found, it is put into the external
 *  variable "_argbreak", and replaced by a null character; if the
 *  arg string ends before that, then the null character is
 *  placed into _argbreak;
 *  If "brk" is 0, then " " is substituted.
 *
 *  HISTORY
 * 01-Jul-83  Steven Shafer (sas) at Carnegie-Mellon University
 *	Bug fix: added check for "back >= front" in loop to chop trailing
 *	white space.
 *
 * 20-Nov-79  Steven Shafer (sas) at Carnegie-Mellon University
 *	Rewritten for VAX.  By popular demand, a table of break characters
 *	has been added (implemented as a string passed into nxtarg).
 *
 *  Originally	from klg (Ken Greer); IUS/SUS UNIX.
 */
#include "supcdefs.h"
#include "supextern.h"

char _argbreak;

char *nxtarg (q,brk)
	char **q,*brk;
{
	char *front, *back;

	front = *q;			/* start of string */
	/* leading blanks and tabs */
	while (*front && (*front == ' ' || *front == '\t'))
		front++;
	/* find break character at end */
	if (brk == 0)
		brk = " ";
	back = skipto (front, brk);
	_argbreak = *back;
	*q = (*back ? back+1 : back);	/* next arg start loc */
	/* elim trailing blanks and tabs */
	back -= 1;
	while ((back >= front) && (*back == ' ' || *back == '\t'))
		back--;
	back++;
	if (*back)
		*back = '\0';
	return (front);
}