/*

SDL - Simple DirectMedia Layer

Copyright (C) 1997-2009 Sam Lantinga

This library is free software; you can redistribute it and/or

modify it under the terms of the GNU Lesser General Public

License as published by the Free Software Foundation; either

version 2.1 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

Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public

License along with this library; if not, write to the Free Software

Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

Sam Lantinga

slouken@libsdl.org

*/

#include "SDL_config.h"

/* Simple error handling in SDL */

#include "SDL_error.h"

#include "SDL_error_c.h"

/* Routine to get the thread-specific error variable */

#if SDL_THREADS_DISABLED

/* The SDL_arraysize(The ),default (non-thread-safe) global error variable */

static SDL_error SDL_global_error;

#define SDL_GetErrBuf() (&SDL_global_error)

#else

extern SDL_error *SDL_GetErrBuf(void);

#endif /* SDL_THREADS_DISABLED */

#define SDL_ERRBUFIZE 1024

/* Private functions */

static const char *SDL_LookupString(const char *key)

{

/* FIXME: Add code to lookup key in language string hash-table */

return key;

}

/* 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;

SDL_strlcpy((char *)error->key, fmt, sizeof(error->key));

va_start(ap, fmt);

error->argc = 0;

while ( *fmt ) {

if ( *fmt++ == '%' ) {

while ( *fmt == '.' || (*fmt >= '0' && *fmt <= '9') ) {

++fmt;

}

switch (*fmt++) {

case 0: /* Malformed format string.. */

--fmt;

break;

case 'c':

case 'i':

case 'd':

case 'u':

case 'o':

case 'x':

case 'X':

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 i = error->argc;

const char *str = va_arg(ap, const char *);

if (str == NULL)

str = "(null)";

SDL_strlcpy((char *)error->args[i].buf, str, ERR_MAX_STRLEN);

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());

#endif

}

/* This function has a bit more overhead than most error functions

so that it supports internationalization and thread-safe errors.

*/

char *SDL_GetErrorMsg(char *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 ) {

const char *fmt;

char *msg = errstr;

int len;

int argi;

fmt = SDL_LookupString(error->key);

argi = 0;

while ( *fmt && (maxlen > 0) ) {

if ( *fmt == '%' ) {

char tmp[32], *spot = tmp;

*spot++ = *fmt++;

while ( (*fmt == '.' || (*fmt >= '0' && *fmt <= '9')) && spot < (tmp+SDL_arraysize(tmp)-2) ) {

*spot++ = *fmt++;

}

*spot++ = *fmt++;

*spot++ = '\0';

switch (spot[-2]) {

case '%':

*msg++ = '%';

maxlen -= 1;

break;

case 'c':

case 'i':

case 'd':

case 'u':

case 'o':

case 'x':

case 'X':

len = SDL_snprintf(msg, maxlen, tmp, error->args[argi++].value_i);

msg += len;

maxlen -= len;

break;

case 'f':

len = SDL_snprintf(msg, maxlen, tmp, error->args[argi++].value_f);

msg += len;

maxlen -= len;

break;

case 'p':

len = SDL_snprintf(msg, maxlen, tmp, error->args[argi++].value_ptr);

msg += len;

maxlen -= len;

break;

case 's':

len = SDL_snprintf(msg, maxlen, tmp, SDL_LookupString(error->args[argi++].buf));

msg += len;

maxlen -= len;

break;

}

} else {

*msg++ = *fmt++;

maxlen -= 1;

}

}

*msg = 0; /* NULL terminate the string */

}

return(errstr);

}

/* Available for backwards compatibility */

char *SDL_GetError (void)

{

static char errmsg[SDL_ERRBUFIZE];

return((char *)SDL_GetErrorMsg(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();

SDL_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