regerror.c

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/*-
 * This code is derived from OpenBSD's libc/regex, original license follows:
 *
 * Copyright (c) 1992, 1993, 1994 Henry Spencer.
 * Copyright (c) 1992, 1993, 1994
 *  The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Henry Spencer.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *  @(#)regerror.c  8.4 (Berkeley) 3/20/94
 */
 
#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <limits.h>
#include <stdlib.h>
#include "regex_impl.h"
 
#include "regutils.h"
 
#ifdef _MSC_VER
#define snprintf _snprintf
#endif
 
static const char *regatoi(const llvm_regex_t *, char *, int);
 
static struct rerr {
  int code;
  const char *name;
  const char *explain;
} rerrs[] = {
  { REG_NOMATCH,  "REG_NOMATCH",  "llvm_regexec() failed to match" },
  { REG_BADPAT, "REG_BADPAT", "invalid regular expression" },
  { REG_ECOLLATE, "REG_ECOLLATE", "invalid collating element" },
  { REG_ECTYPE, "REG_ECTYPE", "invalid character class" },
  { REG_EESCAPE,  "REG_EESCAPE",  "trailing backslash (\\)" },
  { REG_ESUBREG,  "REG_ESUBREG",  "invalid backreference number" },
  { REG_EBRACK, "REG_EBRACK", "brackets ([ ]) not balanced" },
  { REG_EPAREN, "REG_EPAREN", "parentheses not balanced" },
  { REG_EBRACE, "REG_EBRACE", "braces not balanced" },
  { REG_BADBR,  "REG_BADBR",  "invalid repetition count(s)" },
  { REG_ERANGE, "REG_ERANGE", "invalid character range" },
  { REG_ESPACE, "REG_ESPACE", "out of memory" },
  { REG_BADRPT, "REG_BADRPT", "repetition-operator operand invalid" },
  { REG_EMPTY,  "REG_EMPTY",  "empty (sub)expression" },
  { REG_ASSERT, "REG_ASSERT", "\"can't happen\" -- you found a bug" },
  { REG_INVARG, "REG_INVARG", "invalid argument to regex routine" },
  { 0,    "",   "*** unknown regexp error code ***" }
};
 
/*
 - llvm_regerror - the interface to error numbers
 = extern size_t llvm_regerror(int, const llvm_regex_t *, char *, size_t);
 */
/* ARGSUSED */
size_t
llvm_regerror(int errcode, const llvm_regex_t *preg, char *errbuf, size_t errbuf_size)
{
  struct rerr *r;
  size_t len;
  int target = errcode &~ REG_ITOA;
  const char *s;
  char convbuf[50];
 
  if (errcode == REG_ATOI)
    s = regatoi(preg, convbuf, sizeof convbuf);
  else {
    for (r = rerrs; r->code != 0; r++)
      if (r->code == target)
        break;
  
    if (errcode&REG_ITOA) {
      if (r->code != 0) {
        assert(strlen(r->name) < sizeof(convbuf));
        (void) llvm_strlcpy(convbuf, r->name, sizeof convbuf);
      } else
        (void)snprintf(convbuf, sizeof convbuf,
            "REG_0x%x", target);
      s = convbuf;
    } else
      s = r->explain;
  }
 
  len = strlen(s) + 1;
  if (errbuf_size > 0) {
    llvm_strlcpy(errbuf, s, errbuf_size);
  }
 
  return(len);
}
 
/*
 - regatoi - internal routine to implement REG_ATOI
 */
static const char *
regatoi(const llvm_regex_t *preg, char *localbuf, int localbufsize)
{
  struct rerr *r;
 
  for (r = rerrs; r->code != 0; r++)
    if (strcmp(r->name, preg->re_endp) == 0)
      break;
  if (r->code == 0)
    return("0");
 
  (void)snprintf(localbuf, localbufsize, "%d", r->code);
  return(localbuf);
}