/*
 *  error.c:		Error handling
 *
 *  Written by:		Stefan Frank
 *			Ullrich Hafner
 *  
 *  Credits:	Modelled after variable argument routines from Jef
 *		Poskanzer's pbmplus package. 
 *
 *  This file is part of FIASCO («F»ractal «I»mage «A»nd «S»equence «CO»dec)
 *  Copyright (C) 1994-2000 Ullrich Hafner <hafner@bigfoot.de>

    "int dummy = " change to int dummy; dummy =" for Netpbm to avoid 
    unused variable warning.

 */

/*
 *  $Date: 2000/06/14 20:49:37 $
 *  $Author: hafner $
 *  $Revision: 5.1 $
 *  $State: Exp $
 */

#define _ERROR_C

#include "config.h"

#include <stdio.h>
#include <errno.h>

#include <stdarg.h>
#define VA_START(args, lastarg) va_start(args, lastarg)
#include <string.h>

#if HAVE_SETJMP_H
#	include <setjmp.h>
#endif /* HAVE_SETJMP_H */

#include "types.h"
#include "macros.h"
#include "error.h"

#include "misc.h"
#include "fiasco.h"

/*****************************************************************************

			     local variables
  
*****************************************************************************/

static fiasco_verbosity_e  verboselevel  = FIASCO_SOME_VERBOSITY;
static char 	      	  *error_message = NULL;

#if HAVE_SETJMP_H
jmp_buf env;
#endif /* HAVE_SETJMP_H */

/*****************************************************************************

			       public code
  
*****************************************************************************/

void
set_error (const char *format, ...)
/*
 *  Set error text to given string.
 */
{
   va_list     args;
   unsigned    len = 0;
   const char *str = format;
   
   VA_START (args, format);

   len = strlen (format);
   while ((str = strchr (str, '%')))
   {
      str++;
      if (*str == 's')
      {
	 char *vstring = va_arg (args, char *);
	 len += strlen (vstring);
      }
      else if (*str == 'd')
      {
	 int dummy;
     dummy = va_arg (args, int);
	 len += 10;
      }
      else if (*str == 'c')
      {
	 int dummy;
     dummy = va_arg (args, int);
	 len += 1;
      }
      else
	 return;
      str++;
   }
   va_end(args);

   VA_START (args, format);

   if (error_message)
      Free (error_message);
   error_message = Calloc (len, sizeof (char));
   
   vsprintf (error_message, format, args);

   va_end (args);
}

void
error (const char *format, ...)
/*
 *  Set error text to given string.
 */
{
   va_list     args;
   unsigned    len = 0;
   const char *str = format;
   
   VA_START (args, format);

   len = strlen (format);
   while ((str = strchr (str, '%')))
   {
      str++;
      if (*str == 's')
      {
	 char *vstring = va_arg (args, char *);
	 len += strlen (vstring);
      }
      else if (*str == 'd')
      {
	 int dummy;
     dummy = va_arg (args, int);
	 len += 10;
      }
      else if (*str == 'c')
      {
	 int dummy;
     dummy = va_arg (args, int);
	 len += 1;
      }
      else
      {
#if HAVE_SETJMP_H
	 longjmp (env, 1);
#else /* not HAVE_SETJMP_H */
	 exit (1);
#endif /* HAVE_SETJMP_H */
      };
      
      str++;
   }
   va_end(args);

   VA_START (args, format);

   if (error_message)
      Free (error_message);
   error_message = Calloc (len, sizeof (char));
   
   vsprintf (error_message, format, args);

   va_end (args);
   
#if HAVE_SETJMP_H
   longjmp (env, 1);
#else /* not HAVE_SETJMP_H */
   exit (1);
#endif /* HAVE_SETJMP_H */
}

const char *
fiasco_get_error_message (void)
/*
 *  Return value:
 *	Last error message of FIASCO library.
 */
{
   return error_message ? error_message : "";
}

const char *
get_system_error (void)
{
   return strerror (errno);
}

void
file_error (const char *filename)
/*
 *  Print file error message and exit.
 *
 *  No return value.
 */
{
   error ("File `%s': I/O Error - %s.", filename, get_system_error ());
}

void 
warning (const char *format, ...)
/*
 *  Issue a warning and continue execution.
 *
 *  No return value.
 */
{
   va_list	args;

   VA_START (args, format);

   if (verboselevel == FIASCO_NO_VERBOSITY)
      return;
	
   fprintf (stderr, "Warning: ");
   vfprintf (stderr, format, args);
   fputc ('\n', stderr);

   va_end (args);
}

void 
message (const char *format, ...)
/*
 *  Print a message to stderr.
 */
{
   va_list args;

   VA_START (args, format);

   if (verboselevel == FIASCO_NO_VERBOSITY)
      return;

   vfprintf (stderr, format, args);
   fputc ('\n', stderr);
   va_end (args);
}

void 
debug_message (const char *format, ...)
/*
 *  Print a message to stderr.
 */
{
   va_list args;

   VA_START (args, format);

   if (verboselevel < FIASCO_ULTIMATE_VERBOSITY)
      return;

   fprintf (stderr, "*** ");
   vfprintf (stderr, format, args);
   fputc ('\n', stderr);
   va_end (args);
}

void
info (const char *format, ...)
/*
 *  Print a message to stderr. Do not append a newline.
 */
{
   va_list args;

   VA_START (args, format);

   if (verboselevel == FIASCO_NO_VERBOSITY)
      return;

   vfprintf (stderr, format, args);
   fflush (stderr);
   va_end (args);
}

void
fiasco_set_verbosity (fiasco_verbosity_e level)
{
   verboselevel = level;
}

fiasco_verbosity_e
fiasco_get_verbosity (void)
{
   return verboselevel;
}
