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      1 /*	$OpenBSD: regerror.c,v 1.13 2005/08/05 13:03:00 espie Exp $ */
      2 /*-
      3  * Copyright (c) 1992, 1993, 1994 Henry Spencer.
      4  * Copyright (c) 1992, 1993, 1994
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * Henry Spencer.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  *
     34  *	@(#)regerror.c	8.4 (Berkeley) 3/20/94
     35  */
     36 
     37 #include <sys/types.h>
     38 #include <stdio.h>
     39 #include <string.h>
     40 #include <ctype.h>
     41 #include <limits.h>
     42 #include <stdlib.h>
     43 #include "./regex.h"
     44 
     45 #include "utils.h"
     46 
     47 static const char *regatoi(const regex_t *, char *, int);
     48 
     49 static const struct rerr {
     50 	int code;
     51 	const char *name;
     52 	const char *explain;
     53 } rerrs[] = {
     54 	{ REG_NOMATCH,	"REG_NOMATCH",	"regexec() failed to match" },
     55 	{ REG_BADPAT,	"REG_BADPAT",	"invalid regular expression" },
     56 	{ REG_ECOLLATE,	"REG_ECOLLATE",	"invalid collating element" },
     57 	{ REG_ECTYPE,	"REG_ECTYPE",	"invalid character class" },
     58 	{ REG_EESCAPE,	"REG_EESCAPE",	"trailing backslash (\\)" },
     59 	{ REG_ESUBREG,	"REG_ESUBREG",	"invalid backreference number" },
     60 	{ REG_EBRACK,	"REG_EBRACK",	"brackets ([ ]) not balanced" },
     61 	{ REG_EPAREN,	"REG_EPAREN",	"parentheses not balanced" },
     62 	{ REG_EBRACE,	"REG_EBRACE",	"braces not balanced" },
     63 	{ REG_BADBR,	"REG_BADBR",	"invalid repetition count(s)" },
     64 	{ REG_ERANGE,	"REG_ERANGE",	"invalid character range" },
     65 	{ REG_ESPACE,	"REG_ESPACE",	"out of memory" },
     66 	{ REG_BADRPT,	"REG_BADRPT",	"repetition-operator operand invalid" },
     67 	{ REG_EMPTY,	"REG_EMPTY",	"empty (sub)expression" },
     68 	{ REG_ASSERT,	"REG_ASSERT",	"\"can't happen\" -- you found a bug" },
     69 	{ REG_INVARG,	"REG_INVARG",	"invalid argument to regex routine" },
     70 	{ 0,		"",		"*** unknown regexp error code ***" }
     71 };
     72 
     73 /*
     74  - regerror - the interface to error numbers
     75  = extern size_t regerror(int, const regex_t *, char *, size_t);
     76  */
     77 /* ARGSUSED */
     78 size_t
     79 regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
     80 {
     81 	const struct rerr *r;
     82 	size_t len;
     83 	int target = errcode &~ REG_ITOA;
     84 	const char *s;
     85 	char convbuf[50];
     86 
     87 	if (errcode == REG_ATOI)
     88 		s = regatoi(preg, convbuf, sizeof convbuf);
     89 	else {
     90 		for (r = rerrs; r->code != 0; r++)
     91 			if (r->code == target)
     92 				break;
     93 
     94 		if (errcode&REG_ITOA) {
     95 			if (r->code != 0) {
     96 				assert(strlen(r->name) < sizeof(convbuf));
     97 				(void) strncpy(convbuf, r->name, sizeof convbuf);
     98 			} else
     99 				(void)snprintf(convbuf, sizeof convbuf,
    100 				    "REG_0x%x", target);
    101 			s = convbuf;
    102 		} else
    103 			s = r->explain;
    104 	}
    105 
    106 	len = strlen(s) + 1;
    107 	if (errbuf_size > 0) {
    108 		strncpy(errbuf, s, errbuf_size);
    109 	}
    110 
    111 	return(len);
    112 }
    113 
    114 /*
    115  - regatoi - internal routine to implement REG_ATOI
    116  */
    117 static const char *
    118 regatoi(const regex_t *preg, char *localbuf, int localbufsize)
    119 {
    120 	const struct rerr *r;
    121 
    122 	for (r = rerrs; r->code != 0; r++)
    123 		if (strcmp(r->name, preg->re_endp) == 0)
    124 			break;
    125 	if (r->code == 0)
    126 		return("0");
    127 
    128 	(void)snprintf(localbuf, localbufsize, "%d", r->code);
    129 	return(localbuf);
    130 }
    131