mariadb/mysys/my_error.c

/* Copyright (C) 2000 MySQL AB

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

#include "mysys_priv.h"
#include "mysys_err.h"
#include <m_string.h>
#include <stdarg.h>
#include <m_ctype.h>

/* Define some external variables for error handling */

const char ** NEAR my_errmsg[MAXMAPS]={0,0,0,0};
char NEAR errbuff[NRERRBUFFS][ERRMSGSIZE];

/*
   Error message to user

   SYNOPSIS
     my_error()
       nr	Errno
       MyFlags	Flags
       ...	variable list
   NOTE
    The following subset of printf format is supported:
    "%[0-9.-]*l?[sdu]", where all length flags are parsed but ignored.

    Additionally "%.*s" is supported and "%.*[ud]" is correctly parsed but
    the length value is ignored.
*/

int my_error(int nr,myf MyFlags, ...)
{
  va_list	ap;
  uint		olen, plen;
  reg1 const char *tpos;
  reg2 char	*endpos;
  char		* par;
  char		ebuff[ERRMSGSIZE+20];
  int           prec_chars; /* output precision */
  my_bool       prec_supplied;
  DBUG_ENTER("my_error");
  LINT_INIT(prec_chars); /* protected by prec_supplied */

  va_start(ap,MyFlags);
  DBUG_PRINT("my", ("nr: %d  MyFlags: %d  errno: %d", nr, MyFlags, errno));

  if (nr / ERRMOD == GLOB && my_errmsg[GLOB] == 0)
    init_glob_errs();

  olen=(uint) strlen(tpos=my_errmsg[nr / ERRMOD][nr % ERRMOD]);
  endpos=ebuff;

  while (*tpos)
  {
    if (tpos[0] != '%')
    {
      *endpos++= *tpos++;	/* Copy ordinary char */
      continue;
    }
    if (*++tpos == '%')		/* test if %% */
    {
      olen--;
    }
    else
    {
      /*
        Skip size/precision flags to be compatible with printf.
        The only size/precision flag supported is "%.*s".
        If "%.*u" or "%.*d" are encountered, the precision number is read
        from the variable argument list but its value is ignored.
      */
      prec_supplied= 0;
      if (*tpos== '.')
      {
        tpos++;
        olen--;
        if (*tpos == '*')
        {
          tpos++;
          olen--;
          prec_chars= va_arg(ap, int); /* get length parameter */
          prec_supplied= 1;
        }
      }

      if (!prec_supplied)
      {
        while (my_isdigit(&my_charset_latin1, *tpos) || *tpos == '.' ||
               *tpos == '-')
	  tpos++;

        if (*tpos == 'l')				/* Skip 'l' argument */
	  tpos++;
      }

      if (*tpos == 's')				/* String parameter */
      {
	par= va_arg(ap, char *);
	plen= (uint) strlen(par);
        if (prec_supplied && prec_chars > 0)
          plen= min((uint)prec_chars, plen);
	if (olen + plen < ERRMSGSIZE+2)		/* Replace if possible */
	{
          strmake(endpos, par, plen);
          endpos+= plen;
          tpos++;
          olen+= plen-2;
          continue;
	}
      }
      else if (*tpos == 'd' || *tpos == 'u')	/* Integer parameter */
      {
	register int iarg;
	iarg= va_arg(ap, int);
	if (*tpos == 'd')
	  plen= (uint) (int10_to_str((long) iarg, endpos, -10) - endpos);
	else
	  plen= (uint) (int10_to_str((long) (uint) iarg, endpos, 10) - endpos);
	if (olen + plen < ERRMSGSIZE+2) /* Replace parameter if possible */
	{
	  endpos+= plen;
	  tpos++;
	  olen+= plen-2;
	  continue;
	}
      }
    }
    *endpos++= '%';		/* % used as % or unknown code */
  }
  *endpos= '\0';			/* End of errmessage */
  va_end(ap);
  DBUG_RETURN((*error_handler_hook)(nr, ebuff, MyFlags));
}

/*
  Error as printf

  SYNOPSIS
    my_printf_error()
      error	Errno
      format	Format string
      MyFlags	Flags
      ...	variable list
*/

int my_printf_error(uint error, const char *format, myf MyFlags, ...)
{
  va_list args;
  char ebuff[ERRMSGSIZE+20];

  va_start(args,MyFlags);
  (void) vsprintf (ebuff,format,args);
  va_end(args);
  return (*error_handler_hook)(error, ebuff, MyFlags);
}

/*
  Give message using error_handler_hook

  SYNOPSIS
    my_message()
      error	Errno
      str	Error message
      MyFlags	Flags
*/

int my_message(uint error, const char *str, register myf MyFlags)
{
  return (*error_handler_hook)(error, str, MyFlags);
}