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Aminet 44
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Aminet 44 (2001)(GTI - Schatztruhe)[!][Aug 2001].iso
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AmigaSDLsrc.lha
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SDL_error.c
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2001-04-29
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Sam Lantinga
slouken@devolution.com
*/
#ifdef SAVE_RCSID
static char rcsid =
"@(#) $Id: SDL_error.c,v 1.4.2.8 2001/02/13 10:05:49 hercules Exp $";
#endif
/* Simple error handling in SDL */
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include "SDL_types.h"
#include "SDL_getenv.h"
#include "SDL_error.h"
#include "SDL_error_c.h"
#ifndef DISABLE_THREADS
#include "SDL_thread_c.h"
#endif
#ifdef DISABLE_THREADS
/* The default (non-thread-safe) global error variable */
static SDL_error SDL_global_error;
#define SDL_GetErrBuf() (&SDL_global_error)
#endif /* DISABLE_THREADS */
#define SDL_ERRBUFIZE 1024
/* Private functions */
static void SDL_LookupString(const Uint8 *key, Uint16 *buf, int buflen)
{
/* FIXME: Add code to lookup key in language string hash-table */
/* Key not found in language string hash-table */
while ( *key && (--buflen > 0) ) {
*buf++ = *key++;
}
*buf = 0; /* NULL terminate string */
}
/* Public functions */
void SDL_SetError (const char *fmt, ...)
{
va_list ap;
SDL_error *error;
/* Copy in the key, mark error as valid */
error = SDL_GetErrBuf();
error->error = 1;
strncpy((char *)error->key, fmt, sizeof(error->key));
error->key[sizeof(error->key)-1] = '\0';
va_start(ap, fmt);
error->argc = 0;
while ( *fmt ) {
if ( *fmt++ == '%' ) {
switch (*fmt++) {
case 0: /* Malformed format string.. */
--fmt;
break;
#if 0 /* What is a character anyway? (UNICODE issues) */
case 'c':
error->args[error->argc++].value_c =
va_arg(ap, unsigned char);
break;
#endif
case 'd':
error->args[error->argc++].value_i =
va_arg(ap, int);
break;
case 'f':
error->args[error->argc++].value_f =
va_arg(ap, double);
break;
case 'p':
error->args[error->argc++].value_ptr =
va_arg(ap, void *);
break;
case 's':
{
int index = error->argc;
strncpy((char *)error->args[index].buf,
va_arg(ap, char *), ERR_MAX_STRLEN);
error->args[index].buf[ERR_MAX_STRLEN-1] = 0;
error->argc++;
}
break;
default:
break;
}
if ( error->argc >= ERR_MAX_ARGS ) {
break;
}
}
}
va_end(ap);
/* If we are in debug mode, print out an error message */
#ifdef DEBUG_ERROR
fprintf(stderr, "SDL_SetError: %s\n", SDL_GetError());
#else
if ( getenv("SDL_DEBUG") ) {
fprintf(stderr, "SDL_SetError: %s\n", SDL_GetError());
}
#endif
}
/* Print out an integer value to a UNICODE buffer */
static int PrintInt(Uint16 *str, unsigned int maxlen, int value)
{
char tmp[128];
int len, i;
sprintf(tmp, "%d", value);
len = 0;
if ( strlen(tmp) < maxlen ) {
for ( i=0; tmp[i]; ++i ) {
*str++ = tmp[i];
++len;
}
}
return(len);
}
/* Print out a double value to a UNICODE buffer */
static int PrintDouble(Uint16 *str, unsigned int maxlen, double value)
{
char tmp[128];
int len, i;
sprintf(tmp, "%f", value);
len = 0;
if ( strlen(tmp) < maxlen ) {
for ( i=0; tmp[i]; ++i ) {
*str++ = tmp[i];
++len;
}
}
return(len);
}
/* Print out a pointer value to a UNICODE buffer */
static int PrintPointer(Uint16 *str, unsigned int maxlen, void *value)
{
char tmp[128];
int len, i;
sprintf(tmp, "%p", value);
len = 0;
if ( strlen(tmp) < maxlen ) {
for ( i=0; tmp[i]; ++i ) {
*str++ = tmp[i];
++len;
}
}
return(len);
}
/* This function has a bit more overhead than most error functions
so that it supports internationalization and thread-safe errors.
*/
Uint16 *SDL_GetErrorMsgUNICODE(Uint16 *errstr, unsigned int maxlen)
{
SDL_error *error;
/* Clear the error string */
*errstr = 0; --maxlen;
/* Get the thread-safe error, and print it out */
error = SDL_GetErrBuf();
if ( error->error ) {
Uint16 translated[ERR_MAX_STRLEN], *fmt, *msg;
int len;
int argi;
/* Print out the UNICODE error message */
SDL_LookupString(error->key, translated, sizeof(translated));
msg = errstr;
argi = 0;
for ( fmt=translated; *fmt && (maxlen > 0); ) {
if ( *fmt == '%' ) {
switch (fmt[1]) {
case 'S': /* Special SKIP operand */
argi += (fmt[2] - '0');
++fmt;
break;
case '%':
*msg++ = '%';
maxlen -= 1;
break;
#if 0 /* What is a character anyway? (UNICODE issues) */
case 'c':
*msg++ = (unsigned char)
error->args[argi++].value_c;
maxlen -= 1;
break;
#endif
case 'd':
len = PrintInt(msg, maxlen,
error->args[argi++].value_i);
msg += len;
maxlen -= len;
break;
case 'f':
len = PrintDouble(msg, maxlen,
error->args[argi++].value_f);
msg += len;
maxlen -= len;
break;
case 'p':
len = PrintPointer(msg, maxlen,
error->args[argi++].value_ptr);
msg += len;
maxlen -= len;
break;
case 's': /* UNICODE string */
{ Uint16 buf[ERR_MAX_STRLEN], *str;
SDL_LookupString(error->args[argi++].buf, buf, sizeof(buf));
str = buf;
while ( *str && (maxlen > 0) ) {
*msg++ = *str++;
maxlen -= 1;
}
}
break;
}
fmt += 2;
} else {
*msg++ = *fmt++;
maxlen -= 1;
}
}
*msg = 0; /* NULL terminate the string */
}
return(errstr);
}
Uint8 *SDL_GetErrorMsg(Uint8 *errstr, unsigned int maxlen)
{
Uint16 *errstr16;
unsigned int i;
/* Allocate the UNICODE buffer */
errstr16 = (Uint16 *)malloc(maxlen * (sizeof *errstr16));
if ( ! errstr16 ) {
strncpy((char *)errstr, "Out of memory", maxlen);
errstr[maxlen-1] = '\0';
return(errstr);
}
/* Get the error message */
SDL_GetErrorMsgUNICODE(errstr16, maxlen);
/* Convert from UNICODE to Latin1 encoding */
for ( i=0; i<maxlen; ++i ) {
errstr[i] = (Uint8)errstr16[i];
}
/* Free UNICODE buffer (if necessary) */
free(errstr16);
return(errstr);
}
/* Available for backwards compatibility */
char *SDL_GetError (void)
{
static char errmsg[SDL_ERRBUFIZE];
return((char *)SDL_GetErrorMsg((unsigned char *)errmsg, SDL_ERRBUFIZE));
}
void SDL_ClearError(void)
{
SDL_error *error;
error = SDL_GetErrBuf();
error->error = 0;
}
/* Very common errors go here */
void SDL_Error(SDL_errorcode code)
{
switch (code) {
case SDL_ENOMEM:
SDL_SetError("Out of memory");
break;
case SDL_EFREAD:
SDL_SetError("Error reading from datastream");
break;
case SDL_EFWRITE:
SDL_SetError("Error writing to datastream");
break;
case SDL_EFSEEK:
SDL_SetError("Error seeking in datastream");
break;
default:
SDL_SetError("Unknown SDL error");
break;
}
}
#ifdef TEST_ERROR
int main(int argc, char *argv[])
{
char buffer[BUFSIZ+1];
SDL_SetError("Hi there!");
printf("Error 1: %s\n", SDL_GetError());
SDL_ClearError();
memset(buffer, '1', BUFSIZ);
buffer[BUFSIZ] = 0;
SDL_SetError("This is the error: %s (%f)", buffer, 1.0);
printf("Error 2: %s\n", SDL_GetError());
exit(0);
}
#endif