1 /* $OpenBSD: regerror.c,v 1.15 2020/12/30 08:56:38 tb 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 size_t 78 regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size) 79 { 80 const struct rerr *r; 81 size_t len; 82 int target = errcode &~ REG_ITOA; 83 const char *s; 84 char convbuf[50]; 85 86 if (errcode == REG_ATOI) 87 s = regatoi(preg, convbuf, sizeof convbuf); 88 else { 89 for (r = rerrs; r->code != 0; r++) 90 if (r->code == target) 91 break; 92 93 if (errcode®_ITOA) { 94 if (r->code != 0) { 95 assert(strlen(r->name) < sizeof(convbuf)); 96 (void) strlcpy(convbuf, r->name, sizeof convbuf); 97 } else 98 (void)snprintf(convbuf, sizeof convbuf, 99 "REG_0x%x", target); 100 s = convbuf; 101 } else 102 s = r->explain; 103 } 104 105 if (errbuf_size != 0) 106 len = strlcpy(errbuf, s, errbuf_size); 107 else 108 len = strlen(s); 109 110 return len + 1; 111 } 112 113 /* 114 - regatoi - internal routine to implement REG_ATOI 115 */ 116 static const char * 117 regatoi(const regex_t *preg, char *localbuf, int localbufsize) 118 { 119 const struct rerr *r; 120 121 for (r = rerrs; r->code != 0; r++) 122 if (strcmp(r->name, preg->re_endp) == 0) 123 break; 124 if (r->code == 0) 125 return("0"); 126 127 (void)snprintf(localbuf, localbufsize, "%d", r->code); 128 return(localbuf); 129 } 130