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 
52 static const char *regatoi(const llvm_regex_t *, char *, int);
53 
54 static 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 */
83 size_t
llvm_regerror(int errcode,const llvm_regex_t * preg,char * errbuf,size_t errbuf_size)84 llvm_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  */
122 static const char *
regatoi(const llvm_regex_t * preg,char * localbuf,int localbufsize)123 regatoi(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