/*
 * platform_posix.c -- plain POSIX platform wrappers.
 * (C) 2007-2010 - Francesco Romani <fromani -at- gmail -dot- com>
 *
 * This software is provided 'as-is', without any express or implied
 * warranty.  In no event will the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 *    claim that you wrote the original software. If you use this software
 *    in a product, an acknowledgment in the product documentation would be
 *    appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
 */

#include "platform.h"

#include <string.h>
#include <stdarg.h>
#include <errno.h>


/*************************************************************************/
/* I/O is straightforward.                                               */
/*************************************************************************/

int plat_open(const char *pathname, int flags, int mode)
{
    return open(pathname, flags, mode);
}

int plat_close(int fd)
{
    return close(fd);
}

/* 
 * automatically restart after a recoverable interruption
 */
ssize_t plat_read(int fd, void *buf, size_t count)
{
    ssize_t n = 0, r = 0;

    while (r < count) {
        n = read(fd, buf + r, count - r);
        if (n == 0)
	        break;
        if (n < 0) {
	        if (errno == EINTR)
	            continue;
	        else
	            break;
        }

        r += n;
   }
   return r;
}

/* 
 * automatically restart after a recoverable interruption
 */
ssize_t plat_write(int fd, const void *buf, size_t count)
{
    ssize_t n = 0, r = 0;

    while (r < count) {
        n = write(fd, buf + r, count - r);
        if (n < 0)
            return n;

        r += n;
    }
    return r;
}


int64_t plat_seek(int fd, int64_t offset, int whence)
{
    return lseek(fd, offset, whence);
}

int plat_ftruncate(int fd, int64_t length)
{
    return ftruncate(fd, length);
}



/*************************************************************************/
/* Memory management is straightforward too.                             */
/*************************************************************************/

void *_plat_malloc(const char *file, int line, size_t size)
{
    return malloc(size);
}

void *_plat_zalloc(const char *file, int line, size_t size)
{
    return calloc(1, size);
}

void *_plat_realloc(const char *file, int line, void *ptr, size_t size)
{
    return realloc(ptr, size);
}

void plat_free(void *ptr)
{
    free(ptr);
}



/*************************************************************************/
/* Trivial logging support.                                              */
/*************************************************************************/

int plat_log_open(void)
{
    return 0;
}

int plat_log_send(PlatLogLevel level,
                  const char *tag, const char *fmt, ...)
{
    char buffer[1024];
    va_list ap;

    va_start(ap, fmt);
    vsnprintf(buffer, 1024, fmt, ap);
    va_end(ap);

    fprintf(stderr, "[%s] %s\n", tag, buffer);

    return 0;
}

int plat_log_close(void)
{
    return 0;
}

// EOF