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/3rd_party/llvm/lib/Support/regerror.c

https://code.google.com/p/softart/
C | 135 lines | 78 code | 13 blank | 44 comment | 17 complexity | c6fd945f4813279f23057abf159b8286 MD5 | raw file
Possible License(s): LGPL-2.1, BSD-3-Clause, JSON, MPL-2.0-no-copyleft-exception, GPL-2.0, GPL-3.0, LGPL-3.0, BSD-2-Clause
  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}