1/*-
2 * This code is derived from OpenBSD's libc/regex, original license follows:
3 *
4 * Copyright (c) 1992, 1993, 1994 Henry Spencer.
5 * Copyright (c) 1992, 1993, 1994
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Henry Spencer.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 *	@(#)regerror.c	8.4 (Berkeley) 3/20/94
36 */
37
38#include <sys/types.h>
39#include <stdio.h>
40#include <string.h>
41#include <ctype.h>
42#include <limits.h>
43#include <stdlib.h>
44#include "regex_impl.h"
45
46#include "regutils.h"
47
48#ifdef _MSC_VER
49#define snprintf _snprintf
50#endif
51
52static const char *regatoi(const llvm_regex_t *, char *, int);
53
54static struct rerr {
55	int code;
56	const char *name;
57	const char *explain;
58} rerrs[] = {
59	{ REG_NOMATCH,	"REG_NOMATCH",	"llvm_regexec() failed to match" },
60	{ REG_BADPAT,	"REG_BADPAT",	"invalid regular expression" },
61	{ REG_ECOLLATE,	"REG_ECOLLATE",	"invalid collating element" },
62	{ REG_ECTYPE,	"REG_ECTYPE",	"invalid character class" },
63	{ REG_EESCAPE,	"REG_EESCAPE",	"trailing backslash (\\)" },
64	{ REG_ESUBREG,	"REG_ESUBREG",	"invalid backreference number" },
65	{ REG_EBRACK,	"REG_EBRACK",	"brackets ([ ]) not balanced" },
66	{ REG_EPAREN,	"REG_EPAREN",	"parentheses not balanced" },
67	{ REG_EBRACE,	"REG_EBRACE",	"braces not balanced" },
68	{ REG_BADBR,	"REG_BADBR",	"invalid repetition count(s)" },
69	{ REG_ERANGE,	"REG_ERANGE",	"invalid character range" },
70	{ REG_ESPACE,	"REG_ESPACE",	"out of memory" },
71	{ REG_BADRPT,	"REG_BADRPT",	"repetition-operator operand invalid" },
72	{ REG_EMPTY,	"REG_EMPTY",	"empty (sub)expression" },
73	{ REG_ASSERT,	"REG_ASSERT",	"\"can't happen\" -- you found a bug" },
74	{ REG_INVARG,	"REG_INVARG",	"invalid argument to regex routine" },
75	{ 0,		"",		"*** unknown regexp error code ***" }
76};
77
78/*
79 - llvm_regerror - the interface to error numbers
80 = extern size_t llvm_regerror(int, const llvm_regex_t *, char *, size_t);
81 */
82/* ARGSUSED */
83size_t
84llvm_regerror(int errcode, const llvm_regex_t *preg, char *errbuf, size_t errbuf_size)
85{
86	struct rerr *r;
87	size_t len;
88	int target = errcode &~ REG_ITOA;
89	const char *s;
90	char convbuf[50];
91
92	if (errcode == REG_ATOI)
93		s = regatoi(preg, convbuf, sizeof convbuf);
94	else {
95		for (r = rerrs; r->code != 0; r++)
96			if (r->code == target)
97				break;
98
99		if (errcode&REG_ITOA) {
100			if (r->code != 0) {
101				assert(strlen(r->name) < sizeof(convbuf));
102				(void) llvm_strlcpy(convbuf, r->name, sizeof convbuf);
103			} else
104				(void)snprintf(convbuf, sizeof convbuf,
105				    "REG_0x%x", target);
106			s = convbuf;
107		} else
108			s = r->explain;
109	}
110
111	len = strlen(s) + 1;
112	if (errbuf_size > 0) {
113		llvm_strlcpy(errbuf, s, errbuf_size);
114	}
115
116	return(len);
117}
118
119/*
120 - regatoi - internal routine to implement REG_ATOI
121 */
122static const char *
123regatoi(const llvm_regex_t *preg, char *localbuf, int localbufsize)
124{
125	struct rerr *r;
126
127	for (r = rerrs; r->code != 0; r++)
128		if (strcmp(r->name, preg->re_endp) == 0)
129			break;
130	if (r->code == 0)
131		return("0");
132
133	(void)snprintf(localbuf, localbufsize, "%d", r->code);
134	return(localbuf);
135}
136