regex/FreeBSD/regerror.c

   1 /*-
   2  * Copyright (c) 1992, 1993, 1994 Henry Spencer.
   3  * Copyright (c) 1992, 1993, 1994
   4  *      The Regents of the University of California.  All rights reserved.
   5  *
   6  * This code is derived from software contributed to Berkeley by
   7  * Henry Spencer.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed by the University of
  20  *      California, Berkeley and its contributors.
  21  * 4. Neither the name of the University nor the names of its contributors
  22  *    may be used to endorse or promote products derived from this software
  23  *    without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  35  * SUCH DAMAGE.
  36  *
  37  *      @(#)regerror.c  8.4 (Berkeley) 3/20/94
  38  */
  39
  40 #if defined(LIBC_SCCS) && !defined(lint)
  41 static char sccsid[] = "@(#)regerror.c  8.4 (Berkeley) 3/20/94";
  42 #endif /* LIBC_SCCS and not lint */
  43 #include <sys/cdefs.h>
  44 __FBSDID("$FreeBSD: src/lib/libc/regex/regerror.c,v 1.8 2002/10/02 07:49:35 mike Exp $");
  45
  46 #include <sys/types.h>
  47 #include <stdio.h>
  48 #include <string.h>
  49 #include <limits.h>
  50 #include <stdlib.h>
  51 #include <regex.h>
  52
  53 #include "utils.h"
  54
  55 /* ========= begin header generated by ./mkh ========= */
  56 #ifdef __cplusplus
  57 extern "C" {
  58 #endif
  59
  60 /* === regerror.c === */
  61 static char *regatoi(const regex_t *preg, char *localbuf);
  62
  63 #ifdef __cplusplus
  64 }
  65 #endif
  66 /* ========= end header generated by ./mkh ========= */
  67 /*
  68  = #define      REG_NOMATCH      1
  69  = #define      REG_BADPAT       2
  70  = #define      REG_ECOLLATE     3
  71  = #define      REG_ECTYPE       4
  72  = #define      REG_EESCAPE      5
  73  = #define      REG_ESUBREG      6
  74  = #define      REG_EBRACK       7
  75  = #define      REG_EPAREN       8
  76  = #define      REG_EBRACE       9
  77  = #define      REG_BADBR       10
  78  = #define      REG_ERANGE      11
  79  = #define      REG_ESPACE      12
  80  = #define      REG_BADRPT      13
  81  = #define      REG_EMPTY       14
  82  = #define      REG_ASSERT      15
  83  = #define      REG_INVARG      16
  84  = #define      REG_ATOI        255     // convert name to number (!)
  85  = #define      REG_ITOA        0400    // convert number to name (!)
  86  */
  87 static struct rerr {
  88         int code;
  89         char *name;
  90         char *explain;
  91 } rerrs[] = {
  92         {REG_NOMATCH,   "REG_NOMATCH",  "regexec() failed to match"},
  93         {REG_BADPAT,    "REG_BADPAT",   "invalid regular expression"},
  94         {REG_ECOLLATE,  "REG_ECOLLATE", "invalid collating element"},
  95         {REG_ECTYPE,    "REG_ECTYPE",   "invalid character class"},
  96         {REG_EESCAPE,   "REG_EESCAPE",  "trailing backslash (\\)"},
  97         {REG_ESUBREG,   "REG_ESUBREG",  "invalid backreference number"},
  98         {REG_EBRACK,    "REG_EBRACK",   "brackets ([ ]) not balanced"},
  99         {REG_EPAREN,    "REG_EPAREN",   "parentheses not balanced"},
 100         {REG_EBRACE,    "REG_EBRACE",   "braces not balanced"},
 101         {REG_BADBR,     "REG_BADBR",    "invalid repetition count(s)"},
 102         {REG_ERANGE,    "REG_ERANGE",   "invalid character range"},
 103         {REG_ESPACE,    "REG_ESPACE",   "out of memory"},
 104         {REG_BADRPT,    "REG_BADRPT",   "repetition-operator operand invalid"},
 105         {REG_EMPTY,     "REG_EMPTY",    "empty (sub)expression"},
 106         {REG_ASSERT,    "REG_ASSERT",   "\"can't happen\" -- you found a bug"},
 107         {REG_INVARG,    "REG_INVARG",   "invalid argument to regex routine"},
 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(errcode, preg, errbuf, errbuf_size)
 118 int errcode;
 119 const regex_t * __restrict preg;
 120 char * __restrict errbuf;
 121 size_t errbuf_size;
 122 {
 123         struct rerr *r;
 124         size_t len;
 125         int target = errcode &~ REG_ITOA;
 126         char *s;
 127         char convbuf[50];
 128
 129         if (errcode == REG_ATOI)
 130                 s = regatoi(preg, convbuf);
 131         else {
 132                 for (r = rerrs; r->code != 0; r++)
 133                         if (r->code == target)
 134                                 break;
 135
 136                 if (errcode&REG_ITOA) {
 137                         if (r->code != 0)
 138                                 (void) strcpy(convbuf, r->name);
 139                         else
 140                                 sprintf(convbuf, "REG_0x%x", target);
 141                         assert(strlen(convbuf) < sizeof(convbuf));
 142                         s = convbuf;
 143                 } else
 144                         s = r->explain;
 145         }
 146
 147         len = strlen(s) + 1;
 148         if (errbuf_size > 0) {
 149                 if (errbuf_size > len)
 150                         (void) strcpy(errbuf, s);
 151                 else {
 152                         (void) strncpy(errbuf, s, errbuf_size-1);
 153                         errbuf[errbuf_size-1] = '\0';
 154                 }
 155         }
 156
 157         return(len);
 158 }
 159
 160 /*
 161  - regatoi - internal routine to implement REG_ATOI
 162  == static char *regatoi(const regex_t *preg, char *localbuf);
 163  */
 164 static char *
 165 regatoi(preg, localbuf)
 166 const regex_t *preg;
 167 char *localbuf;
 168 {
 169         struct rerr *r;
 170
 171         for (r = rerrs; r->code != 0; r++)
 172                 if (strcmp(r->name, preg->re_endp) == 0)
 173                         break;
 174         if (r->code == 0)
 175                 return("0");
 176
 177         sprintf(localbuf, "%d", r->code);
 178         return(localbuf);
 179 }