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/* error handling common to all routines. */
/* Copyright (c) 1992, 1999, 2001 John E. Davis
* This file is part of the S-Lang library.
*
* You may distribute under the terms of either the GNU General Public
* License or the Perl Artistic License.
*/
#include "slinclud.h"
#include "slang.h"
#include "_slang.h"
void (*SLang_VMessage_Hook) (char *, va_list);
void (*SLang_Error_Hook)(char *);
void (*SLang_Exit_Error_Hook)(char *, va_list);
volatile int SLang_Error = 0;
char *SLang_Error_Message;
volatile int SLKeyBoard_Quit = 0;
static char *get_error_string (void)
{
char *str;
if (!SLang_Error) SLang_Error = SL_UNKNOWN_ERROR;
if (SLang_Error_Message != NULL) str = SLang_Error_Message;
else switch(SLang_Error)
{
case SL_NOT_IMPLEMENTED: str = "Not Implemented"; break;
case SL_APPLICATION_ERROR: str = "Application Error"; break;
case SL_VARIABLE_UNINITIALIZED: str = "Variable Uninitialized"; break;
case SL_MALLOC_ERROR : str = "Malloc Error"; break;
case SL_INTERNAL_ERROR: str = "Internal Error"; break;
case SL_STACK_OVERFLOW: str = "Stack Overflow"; break;
case SL_STACK_UNDERFLOW: str = "Stack Underflow"; break;
case SL_INTRINSIC_ERROR: str = "Intrinsic Error"; break;
case SL_USER_BREAK: str = "User Break"; break;
case SL_UNDEFINED_NAME: str = "Undefined Name"; break;
case SL_SYNTAX_ERROR: str = "Syntax Error"; break;
case SL_DUPLICATE_DEFINITION: str = "Duplicate Definition"; break;
case SL_TYPE_MISMATCH: str = "Type Mismatch"; break;
case SL_READONLY_ERROR: str = "Variable is read-only"; break;
case SL_DIVIDE_ERROR: str = "Divide by zero"; break;
case SL_OBJ_NOPEN: str = "Object not opened"; break;
case SL_OBJ_UNKNOWN: str = "Object unknown"; break;
case SL_INVALID_PARM: str = "Invalid Parameter"; break;
case SL_TYPE_UNDEFINED_OP_ERROR:
str = "Operation not defined for datatype"; break;
case SL_USER_ERROR:
str = "User Error"; break;
case SL_USAGE_ERROR:
str = "Illegal usage of function";
break;
case SL_FLOATING_EXCEPTION:
str = "Floating Point Exception";
break;
case SL_UNKNOWN_ERROR:
default: str = "Unknown Error Code";
}
SLang_Error_Message = NULL;
return str;
}
void SLang_doerror (char *error)
{
char *str = NULL;
char *err;
char *malloced_err_buf;
char err_buf [1024];
malloced_err_buf = NULL;
if (((SLang_Error == SL_USER_ERROR)
|| (SLang_Error == SL_USAGE_ERROR))
&& (error != NULL) && (*error != 0))
err = error;
else
{
char *sle = "S-Lang Error: ";
unsigned int len;
char *fmt;
str = get_error_string ();
fmt = "%s%s%s";
if ((error == NULL) || (*error == 0))
error = "";
else if (SLang_Error == SL_UNKNOWN_ERROR)
/* Do not display an unknown error message if error is non-NULL */
str = "";
else
fmt = "%s%s: %s";
len = strlen (sle) + strlen (str) + strlen(error) + 1;
err = err_buf;
if (len >= sizeof (err_buf))
{
if (NULL == (malloced_err_buf = SLmalloc (len)))
err = NULL;
else
err = malloced_err_buf;
}
if (err != NULL) sprintf (err, fmt, sle, str, error);
else err = "Out of memory";
}
if (SLang_Error_Hook == NULL)
{
fputs (err, stderr);
fputs("\r\n", stderr);
fflush (stderr);
}
else
(*SLang_Error_Hook)(err);
SLfree (malloced_err_buf);
}
void SLang_verror (int err_code, char *fmt, ...)
{
va_list ap;
char err [1024];
if (err_code == 0) err_code = SL_INTRINSIC_ERROR;
if (SLang_Error == 0) SLang_Error = err_code;
if (fmt != NULL)
{
va_start(ap, fmt);
(void) _SLvsnprintf (err, sizeof (err), fmt, ap);
fmt = err;
va_end(ap);
}
SLang_doerror (fmt);
}
void SLang_exit_error (char *fmt, ...)
{
va_list ap;
va_start (ap, fmt);
if (SLang_Exit_Error_Hook != NULL)
{
(*SLang_Exit_Error_Hook) (fmt, ap);
exit (1);
}
if (fmt != NULL)
{
vfprintf (stderr, fmt, ap);
fputs ("\r\n", stderr);
fflush (stderr);
}
va_end (ap);
exit (1);
}
void SLang_vmessage (char *fmt, ...)
{
va_list ap;
if (fmt == NULL)
return;
va_start (ap, fmt);
if (SLang_VMessage_Hook != NULL)
(*SLang_VMessage_Hook) (fmt, ap);
else
{
vfprintf (stdout, fmt, ap);
fputs ("\r\n", stdout);
}
va_end (ap);
}
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