text: /*	$NetBSD: regerror.c,v 1.7 1997/07/21 14:08:16 jtc Exp $	*/
  
  /*-
   * Copyright (c) 1992, 1993, 1994 Henry Spencer.
   * Copyright (c) 1992, 1993, 1994
   *	The Regents of the University of California.  All rights reserved.
   *
   * This code is derived from software contributed to Berkeley by
   * Henry Spencer.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. 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.
   * 3. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *	This product includes software developed by the University of
   *	California, Berkeley and its contributors.
   * 4. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 THE REGENTS OR CONTRIBUTORS 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.
   *
   *	@(#)regerror.c	8.4 (Berkeley) 3/20/94
   */
  
  #include <sys/cdefs.h>
  #if defined(LIBC_SCCS) && !defined(lint)
  #if 0
  static char sccsid[] = "@(#)regerror.c	8.4 (Berkeley) 3/20/94";
  #else
  __RCSID("$NetBSD: regerror.c,v 1.7 1997/07/21 14:08:16 jtc Exp $");
  #endif
  #endif /* LIBC_SCCS and not lint */
  
  #include "namespace.h"
  #include <sys/types.h>
  #include <stdio.h>
  #include <string.h>
  #include <ctype.h>
  #include <limits.h>
  #include <stdlib.h>
  #include <regex.h>
  
  #ifdef __weak_alias
  __weak_alias(regerror,_regerror);
  #endif
  
  #include "utils.h"
  
  /* ========= begin header generated by ./mkh ========= */
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  /* === regerror.c === */
  static char *regatoi __P((const regex_t *preg, char *localbuf, int buflen));
  
  #ifdef __cplusplus
  }
  #endif
  /* ========= end header generated by ./mkh ========= */
  /*
   = #define	REG_NOMATCH	 1
   = #define	REG_BADPAT	 2
   = #define	REG_ECOLLATE	 3
   = #define	REG_ECTYPE	 4
   = #define	REG_EESCAPE	 5
   = #define	REG_ESUBREG	 6
   = #define	REG_EBRACK	 7
   = #define	REG_EPAREN	 8
   = #define	REG_EBRACE	 9
   = #define	REG_BADBR	10
   = #define	REG_ERANGE	11
   = #define	REG_ESPACE	12
   = #define	REG_BADRPT	13
   = #define	REG_EMPTY	14
   = #define	REG_ASSERT	15
   = #define	REG_INVARG	16
   = #define	REG_ATOI	255	// convert name to number (!)
   = #define	REG_ITOA	0400	// convert number to name (!)
   */
  static struct rerr {
  	int code;
  	char *name;
  	char *explain;
  } rerrs[] = {
  	{ REG_NOMATCH,	"REG_NOMATCH",	"regexec() failed to match" },
  	{ REG_BADPAT,	"REG_BADPAT",	"invalid regular expression" },
  	{ REG_ECOLLATE,	"REG_ECOLLATE",	"invalid collating element" },
  	{ REG_ECTYPE,	"REG_ECTYPE",	"invalid character class" },
  	{ REG_EESCAPE,	"REG_EESCAPE",	"trailing backslash (\\)" },
  	{ REG_ESUBREG,	"REG_ESUBREG",	"invalid backreference number" },
  	{ REG_EBRACK,	"REG_EBRACK",	"brackets ([ ]) not balanced" },
  	{ REG_EPAREN,	"REG_EPAREN",	"parentheses not balanced" },
  	{ REG_EBRACE,	"REG_EBRACE",	"braces not balanced" },
  	{ REG_BADBR,	"REG_BADBR",	"invalid repetition count(s)" },
  	{ REG_ERANGE,	"REG_ERANGE",	"invalid character range" },
  	{ REG_ESPACE,	"REG_ESPACE",	"out of memory" },
  	{ REG_BADRPT,	"REG_BADRPT",	"repetition-operator operand invalid" },
  	{ REG_EMPTY,	"REG_EMPTY",	"empty (sub)expression" },
  	{ REG_ASSERT,	"REG_ASSERT",	"\"can't happen\" -- you found a bug" },
  	{ REG_INVARG,	"REG_INVARG",	"invalid argument to regex routine" },
  	{ 0,		"",		"*** unknown regexp error code ***" }
  };
  
  /*
   * regerror - the interface to error numbers
   * extern size_t regerror(int, const regex_t *, char *, size_t);
   */
  /* ARGSUSED */
  size_t
  regerror(errcode, preg, errbuf, errbuf_size)
  int errcode;
  const regex_t *preg;
  char *errbuf;
  size_t errbuf_size;
  {
  	register struct rerr *r;
  	register size_t len;
  	register int target = errcode &~ REG_ITOA;
  	register char *s;
  	char convbuf[50];
  
  	if (errcode == REG_ATOI)
  		s = regatoi(preg, convbuf, sizeof convbuf);
  	else {
  		for (r = rerrs; r->code != 0; r++)
  			if (r->code == target)
  				break;
  	
  		if (errcode&REG_ITOA) {
  			if (r->code != 0)
  				(void)strncpy(convbuf, r->name, sizeof convbuf);
  			else
  				(void)snprintf(convbuf, sizeof convbuf,
  				    "REG_0x%x", target);
  			s = convbuf;
  		} else
  			s = r->explain;
  	}
  
  	len = strlen(s) + 1;
  	if (errbuf_size > 0) {
  		(void)strncpy(errbuf, s, errbuf_size - 1);
  		errbuf[errbuf_size-1] = '\0';
  	}
  
  	return(len);
  }
  
  /*
   * regatoi - internal routine to implement REG_ATOI
   * static char *regatoi(const regex_t *preg, char *localbuf, int buflen);
   */
  static char *
  regatoi(preg, localbuf, buflen)
  const regex_t *preg;
  char *localbuf;
  int buflen;
  {
  	register struct rerr *r;
  
  	for (r = rerrs; r->code != 0; r++)
  		if (strcmp(r->name, preg->re_endp) == 0)
  			break;
  	if (r->code == 0)
  		return("0");
  
  	(void)snprintf(localbuf, buflen, "%d", r->code);
  	return(localbuf);
  }
  