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stresc.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2010 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              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);
}

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