lib/Support/regerror.c

   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
  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 *
 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 }