winsup/cygwin/regex/regerror.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   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 #if defined(LIBC_SCCS) && !defined(lint)
  39 static char sccsid[] = "@(#)regerror.c  8.4 (Berkeley) 3/20/94";
  40 #endif /* LIBC_SCCS and not lint */
  41 #include <sys/cdefs.h>
  42 __FBSDID("$FreeBSD$");
  43
  44 #include <sys/types.h>
  45 #include <stdio.h>
  46 #include <string.h>
  47 #include <limits.h>
  48 #include <stdlib.h>
  49 #include <regex.h>
  50
  51 #include "utils.h"
  52
  53 /* ========= begin header generated by ./mkh ========= */
  54 #ifdef __cplusplus
  55 extern "C" {
  56 #endif
  57
  58 /* === regerror.c === */
  59 static const char *regatoi(const regex_t *preg, char *localbuf);
  60
  61 #ifdef __cplusplus
  62 }
  63 #endif
  64 /* ========= end header generated by ./mkh ========= */
  65 /*
  66  = #define      REG_NOMATCH      1
  67  = #define      REG_BADPAT       2
  68  = #define      REG_ECOLLATE     3
  69  = #define      REG_ECTYPE       4
  70  = #define      REG_EESCAPE      5
  71  = #define      REG_ESUBREG      6
  72  = #define      REG_EBRACK       7
  73  = #define      REG_EPAREN       8
  74  = #define      REG_EBRACE       9
  75  = #define      REG_BADBR       10
  76  = #define      REG_ERANGE      11
  77  = #define      REG_ESPACE      12
  78  = #define      REG_BADRPT      13
  79  = #define      REG_EMPTY       14
  80  = #define      REG_ASSERT      15
  81  = #define      REG_INVARG      16
  82  = #define      REG_ILLSEQ      17
  83  = #define      REG_ATOI        255     // convert name to number (!)
  84  = #define      REG_ITOA        0400    // convert number to name (!)
  85  */
  86 static struct rerr {
  87         int code;
  88         const char *name;
  89         const char *explain;
  90 } rerrs[] = {
  91         {REG_NOMATCH,   "REG_NOMATCH",  "regexec() failed to match"},
  92         {REG_BADPAT,    "REG_BADPAT",   "invalid regular expression"},
  93         {REG_ECOLLATE,  "REG_ECOLLATE", "invalid collating element"},
  94         {REG_ECTYPE,    "REG_ECTYPE",   "invalid character class"},
  95         {REG_EESCAPE,   "REG_EESCAPE",  "trailing backslash (\\)"},
  96         {REG_ESUBREG,   "REG_ESUBREG",  "invalid backreference number"},
  97         {REG_EBRACK,    "REG_EBRACK",   "brackets ([ ]) not balanced"},
  98         {REG_EPAREN,    "REG_EPAREN",   "parentheses not balanced"},
  99         {REG_EBRACE,    "REG_EBRACE",   "braces not balanced"},
 100         {REG_BADBR,     "REG_BADBR",    "invalid repetition count(s)"},
 101         {REG_ERANGE,    "REG_ERANGE",   "invalid character range"},
 102         {REG_ESPACE,    "REG_ESPACE",   "out of memory"},
 103         {REG_BADRPT,    "REG_BADRPT",   "repetition-operator operand invalid"},
 104         {REG_EMPTY,     "REG_EMPTY",    "empty (sub)expression"},
 105         {REG_ASSERT,    "REG_ASSERT",   "\"can't happen\" -- you found a bug"},
 106         {REG_INVARG,    "REG_INVARG",   "invalid argument to regex routine"},
 107         {REG_ILLSEQ,    "REG_ILLSEQ",   "illegal byte sequence"},
 108         {0,             "",             "*** unknown regexp error code ***"}
 109 };
 110
 111 /*
 112  - regerror - the interface to error numbers
 113  = extern size_t regerror(int, const regex_t *, char *, size_t);
 114  */
 115 /* ARGSUSED */
 116 size_t
 117 regerror(int errcode,
 118          const regex_t * __restrict preg,
 119          char * __restrict errbuf,
 120          size_t errbuf_size)
 121 {
 122         struct rerr *r;
 123         size_t len;
 124         int target = errcode &~ REG_ITOA;
 125         const char *s;
 126         char convbuf[50];
 127
 128         if (errcode == REG_ATOI)
 129                 s = regatoi(preg, convbuf);
 130         else {
 131                 for (r = rerrs; r->code != 0; r++)
 132                         if (r->code == target)
 133                                 break;
 134
 135                 if (errcode&REG_ITOA) {
 136                         if (r->code != 0)
 137                                 (void) strcpy(convbuf, r->name);
 138                         else
 139                                 sprintf(convbuf, "REG_0x%x", target);
 140                         assert(strlen(convbuf) < sizeof(convbuf));
 141                         s = convbuf;
 142                 } else
 143                         s = r->explain;
 144         }
 145
 146         len = strlen(s) + 1;
 147         if (errbuf_size > 0) {
 148                 if (errbuf_size > len)
 149                         (void) strcpy(errbuf, s);
 150                 else {
 151                         (void) strncpy(errbuf, s, errbuf_size-1);
 152                         errbuf[errbuf_size-1] = '\0';
 153                 }
 154         }
 155
 156         return(len);
 157 }
 158
 159 /*
 160  - regatoi - internal routine to implement REG_ATOI
 161  == static char *regatoi(const regex_t *preg, char *localbuf);
 162  */
 163 static const char *
 164 regatoi(const regex_t *preg, char *localbuf)
 165 {
 166         struct rerr *r;
 167
 168         for (r = rerrs; r->code != 0; r++)
 169                 if (strcmp(r->name, preg->re_endp) == 0)
 170                         break;
 171         if (r->code == 0)
 172                 return("0");
 173
 174         sprintf(localbuf, "%d", r->code);
 175         return(localbuf);
 176 }