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regerror.c

/*
 * regerror - error-code expansion
 *
 * Copyright (c) 1998, 1999 Henry Spencer.      All rights reserved.
 *
 * Development of this software was funded, in part, by Cray Research Inc.,
 * UUNET Communications Services Inc., Sun Microsystems Inc., and Scriptics
 * Corporation, none of whom are responsible for the results.  The author
 * thanks all of them.
 *
 * Redistribution and use in source and binary forms -- with or without
 * modification -- are permitted for any purpose, provided that
 * redistributions in source form retain this entire copyright notice and
 * indicate the origin and nature of any modifications.
 *
 * I'd appreciate being given credit for this package in the documentation
 * of software which uses it, but that is not a requirement.
 *
 * THIS SOFTWARE IS PROVIDED ``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
 * HENRY SPENCER 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.
 *
 * $PostgreSQL: pgsql/src/backend/regex/regerror.c,v 1.28 2008/02/14 17:33:37 tgl Exp $
 *
 */

#include "regex/regguts.h"

/* unknown-error explanation */
static char unk[] = "*** unknown regex error code 0x%x ***";

/* struct to map among codes, code names, and explanations */
static struct rerr
{
      int               code;
      const char *name;
      const char *explain;
}     rerrs[] =

{
      /* the actual table is built from regex.h */
#include "regex/regerrs.h"
      {
            -1, "", "oops"
      },                                        /* explanation special-cased in code */
};

/*
 * pg_regerror - the interface to error numbers
 */
/* ARGSUSED */
size_t                                          /* actual space needed (including NUL) */
pg_regerror(int errcode,            /* error code, or REG_ATOI or REG_ITOA */
                  const regex_t *preg,    /* associated regex_t (unused at present) */
                  char *errbuf,           /* result buffer (unless errbuf_size==0) */
                  size_t errbuf_size) /* available space in errbuf, can be 0 */
{
      struct rerr *r;
      const char *msg;
      char        convbuf[sizeof(unk) + 50];          /* 50 = plenty for int */
      size_t            len;
      int               icode;

      switch (errcode)
      {
            case REG_ATOI:                /* convert name to number */
                  for (r = rerrs; r->code >= 0; r++)
                        if (strcmp(r->name, errbuf) == 0)
                              break;
                  sprintf(convbuf, "%d", r->code);    /* -1 for unknown */
                  msg = convbuf;
                  break;
            case REG_ITOA:                /* convert number to name */
                  icode = atoi(errbuf);         /* not our problem if this fails */
                  for (r = rerrs; r->code >= 0; r++)
                        if (r->code == icode)
                              break;
                  if (r->code >= 0)
                        msg = r->name;
                  else
                  {                             /* unknown; tell him the number */
                        sprintf(convbuf, "REG_%u", (unsigned) icode);
                        msg = convbuf;
                  }
                  break;
            default:                      /* a real, normal error code */
                  for (r = rerrs; r->code >= 0; r++)
                        if (r->code == errcode)
                              break;
                  if (r->code >= 0)
                        msg = r->explain;
                  else
                  {                             /* unknown; say so */
                        sprintf(convbuf, unk, errcode);
                        msg = convbuf;
                  }
                  break;
      }

      len = strlen(msg) + 1;        /* space needed, including NUL */
      if (errbuf_size > 0)
      {
            if (errbuf_size > len)
                  strcpy(errbuf, msg);
            else
            {                                   /* truncate to fit */
                  strncpy(errbuf, msg, errbuf_size - 1);
                  errbuf[errbuf_size - 1] = '\0';
            }
      }

      return len;
}

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