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/*
* Raster error handling for CUPS.
*
* Copyright 2007-2015 by Apple Inc.
* Copyright 2007 by Easy Software Products.
*
* These coded instructions, statements, and computer programs are the
* property of Apple Inc. and are protected by Federal copyright
* law. Distribution and use rights are outlined in the file "LICENSE.txt"
* which should have been included with this file. If this file is
* missing or damaged, see the license at "http://www.cups.org/".
*
* This file is subject to the Apple OS-Developed Software exception.
*/
/*
* Include necessary headers...
*/
#include <cups/raster-private.h>
/*
* Local structures...
*/
typedef struct _cups_raster_error_s /**** Error buffer structure ****/
{
char *start, /* Start of buffer */
*current, /* Current position in buffer */
*end; /* End of buffer */
} _cups_raster_error_t;
/*
* Local functions...
*/
static _cups_raster_error_t *get_error_buffer(void);
/*
* '_cupsRasterAddError()' - Add an error message to the error buffer.
*/
void
_cupsRasterAddError(const char *f, /* I - Printf-style error message */
...) /* I - Additional arguments as needed */
{
_cups_raster_error_t *buf = get_error_buffer();
/* Error buffer */
va_list ap; /* Pointer to additional arguments */
char s[2048]; /* Message string */
ssize_t bytes; /* Bytes in message string */
DEBUG_printf(("_cupsRasterAddError(f=\"%s\", ...)", f));
va_start(ap, f);
bytes = vsnprintf(s, sizeof(s), f, ap);
va_end(ap);
if (bytes <= 0)
return;
DEBUG_printf(("1_cupsRasterAddError: %s", s));
bytes ++;
if ((size_t)bytes >= sizeof(s))
return;
if (bytes > (ssize_t)(buf->end - buf->current))
{
/*
* Allocate more memory...
*/
char *temp; /* New buffer */
size_t size; /* Size of buffer */
size = (size_t)(buf->end - buf->start + 2 * bytes + 1024);
if (buf->start)
temp = realloc(buf->start, size);
else
temp = malloc(size);
if (!temp)
return;
/*
* Update pointers...
*/
buf->end = temp + size;
buf->current = temp + (buf->current - buf->start);
buf->start = temp;
}
/*
* Append the message to the end of the current string...
*/
memcpy(buf->current, s, (size_t)bytes);
buf->current += bytes - 1;
}
/*
* '_cupsRasterClearError()' - Clear the error buffer.
*/
void
_cupsRasterClearError(void)
{
_cups_raster_error_t *buf = get_error_buffer();
/* Error buffer */
buf->current = buf->start;
if (buf->start)
*(buf->start) = '\0';
}
/*
* 'cupsRasterErrorString()' - Return the last error from a raster function.
*
* If there are no recent errors, NULL is returned.
*
* @since CUPS 1.3/macOS 10.5@
*/
const char * /* O - Last error */
cupsRasterErrorString(void)
{
_cups_raster_error_t *buf = get_error_buffer();
/* Error buffer */
if (buf->current == buf->start)
return (NULL);
else
return (buf->start);
}
#ifdef HAVE_PTHREAD_H
/*
* Implement per-thread globals...
*/
# include <pthread.h>
/*
* Local globals...
*/
static pthread_key_t raster_key = 0; /* Thread local storage key */
static pthread_once_t raster_key_once = PTHREAD_ONCE_INIT;
/* One-time initialization object */
/*
* Local functions...
*/
static void raster_init(void);
static void raster_destructor(void *value);
/*
* 'get_error_buffer()' - Return a pointer to thread local storage.
*/
_cups_raster_error_t * /* O - Pointer to error buffer */
get_error_buffer(void)
{
_cups_raster_error_t *buf; /* Pointer to error buffer */
/*
* Initialize the global data exactly once...
*/
DEBUG_puts("3get_error_buffer()");
pthread_once(&raster_key_once, raster_init);
/*
* See if we have allocated the data yet...
*/
if ((buf = (_cups_raster_error_t *)pthread_getspecific(raster_key))
== NULL)
{
DEBUG_puts("4get_error_buffer: allocating memory for thread.");
/*
* No, allocate memory as set the pointer for the key...
*/
buf = calloc(1, sizeof(_cups_raster_error_t));
pthread_setspecific(raster_key, buf);
DEBUG_printf(("4get_error_buffer: buf=%p", (void *)buf));
}
/*
* Return the pointer to the data...
*/
return (buf);
}
/*
* 'raster_init()' - Initialize error buffer once.
*/
static void
raster_init(void)
{
pthread_key_create(&raster_key, raster_destructor);
DEBUG_printf(("3raster_init(): raster_key=%x(%u)", (unsigned)raster_key, (unsigned)raster_key));
}
/*
* 'raster_destructor()' - Free memory allocated by get_error_buffer().
*/
static void
raster_destructor(void *value) /* I - Data to free */
{
_cups_raster_error_t *buf = (_cups_raster_error_t *)value;
/* Error buffer */
DEBUG_printf(("3raster_destructor(value=%p)", value));
if (buf->start)
free(buf->start);
free(value);
}
#else
/*
* Implement static globals...
*/
/*
* 'get_error_buffer()' - Return a pointer to thread local storage.
*/
_cups_raster_error_t * /* O - Pointer to error buffer */
get_error_buffer(void)
{
static _cups_raster_error_t buf = { 0, 0, 0 };
/* Error buffer */
return (&buf);
}
#endif /* HAVE_PTHREAD_H */
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