/***********************************************************************

*                                                                      *

*               This software is part of the ast package               *

*          Copyright (c) 1985-2011 AT&T Intellectual Property          *

*                      and is licensed under the                       *

*                 Eclipse Public License, Version 1.0                  *

*                    by AT&T Intellectual Property                     *

*                                                                      *

*                A copy of the License is available at                 *

*          http://www.eclipse.org/org/documents/epl-v10.html           *

*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *

*                                                                      *

*              Information and Software Systems Research               *

*                            AT&T Research                             *

*                           Florham Park NJ                            *

*                                                                      *

*                 Glenn Fowler <gsf@research.att.com>                  *

*                  David Korn <dgk@research.att.com>                   *

*                   Phong Vo <kpv@research.att.com>                    *

*                                                                      *

***********************************************************************/

#pragma prototyped

/*

 * Glenn Fowler

 * AT&T Research

 *

 * convert \X character constants in s in place

 * the length of the converted s is returned (may have embedded \0's)

 * wide chars absent locale guidance default to UTF-8

 * strexp() FMT_EXP_* flags passed to chrexp() for selective conversion

 */

#include <ast.h>

int

strexp(register char* s, int flags)

{

	register char*		t;

	register unsigned int	c;

	char*			b;

	char*			e;

	int			w;

	b = t = s;

	while (c = *s++)

	{

		if (c == '\\')

		{

			c = chrexp(s - 1, &e, &w, flags);

			s = e;

			if (w)

			{

				t += mbwide() ? mbconv(t, c) : wc2utf8(t, c);

				continue;

			}

		}

		*t++ = c;

	}

	*t = 0;

	return t - b;

}

int

stresc(register char* s)

{

	return strexp(s, FMT_EXP_CHAR|FMT_EXP_LINE|FMT_EXP_WIDE);

}