/*
 * Simple Regular Expression functions. Derived from Unix 7th Edition,
 * /usr/src/cmd/expr.y
 *
 * Modified by Gunnar Ritter, Freiburg i. Br., Germany, January 2003.
 *
 * Copyright(C) Caldera International Inc. 2001-2002. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *   Redistributions of source code and documentation must retain the
 *    above copyright notice, this list of conditions and the following
 *    disclaimer.
 *   Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *   All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed or owned by Caldera
 *      International, Inc.
 *   Neither the name of Caldera International, Inc. nor the names of
 *    other contributors may be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * USE OF THE SOFTWARE PROVIDED FOR UNDER THIS LICENSE BY CALDERA
 * INTERNATIONAL, INC. AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL CALDERA INTERNATIONAL, INC. BE
 * LIABLE FOR ANY DIRECT, INDIRECT INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*	Sccsid @(#)regexpr.c	1.8 (gritter) 10/13/04	*/

#include "regexpr.h"
#include <stdlib.h>

int regerrno, reglength;
static int circf;

static char *regexpr_compile(char *, char *, const char *, int);

char *compile(const char *instring, char *ep, char *endbuf) {
  char *cp;
  int sz = 0;

  if (ep == 0) {
    for (cp = (char *)instring; *cp != '\0'; cp++)
      if (*cp == '[')
        sz += 32;
    sz += 2 * (cp - instring) + 5;
    if ((ep = malloc(sz)) == 0) {
      regerrno = 11;
      return 0;
    }
    endbuf = &ep[sz];
    ep[1] = '\0';
  }
  if ((cp = regexpr_compile((char *)instring, &ep[1], endbuf, '\0')) == 0) {
    if (sz)
      free(ep);
    return 0;
  }
  ep[0] = circf;
  reglength = cp - ep;
  return sz ? ep : cp;
}

#define INIT register char *sp = instring;
#define GETC() (*sp++)
#define PEEKC() (*sp)
#define UNGETC(c) (--sp)
#define RETURN(c) return (c);
#define ERROR(c)                                                               \
  {                                                                            \
    regerrno = c;                                                              \
    return 0;                                                                  \
  }

#define compile(a, b, c, d) regexpr_compile(a, b, c, d)
#define regexp_h_static static
#define REGEXP_H_STEP_INIT circf = *p2++;
#define REGEXP_H_ADVANCE_INIT circf = *ep++;

#include "regexp.h"
