write.c

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/*
 * Support and FAQ: visit <a href="https://www.microchip.com/support/">Microchip Support</a>
 */

#include "compiler.h"

volatile void *volatile stdio_base;
int (*ptr_put)(void volatile*, char);


#if ( defined(__ICCAVR32__) || defined(__ICCAVR__) || defined(__ICCARM__))

#include <yfuns.h>

#if (__VER__ < 8010000)
// Refer http://ftp.iar.se/WWWfiles/arm/webic/doc/EWARM_MigrationGuide.ENU.pdf
_STD_BEGIN
#endif

#pragma module_name = "?__write"

size_t __write(int handle, const unsigned char *buffer, size_t size)
{
        size_t nChars = 0;

        if (buffer == 0) {
                // This means that we should flush internal buffers.
                return 0;
        }

        // This implementation only writes to stdout and stderr.
        // For all other file handles, it returns failure.
        if (handle != _LLIO_STDOUT && handle != _LLIO_STDERR) {
                return _LLIO_ERROR;
        }

        for (; size != 0; --size) {
                if (ptr_put(stdio_base, *buffer++) < 0) {
                        return _LLIO_ERROR;
                }
                ++nChars;
        }
        return nChars;
}

#if (__VER__ < 8010000)
// Refer http://ftp.iar.se/WWWfiles/arm/webic/doc/EWARM_MigrationGuide.ENU.pdf
_STD_END
#endif


#elif (defined(__GNUC__) && !XMEGA && !MEGA)

int __attribute__((weak))
_write (int file, const char *ptr, int len);

int __attribute__((weak))
_write (int file, const char *ptr, int len)
{
        int nChars = 0;

        if ((file != 1) && (file != 2) && (file!=3)) {
                return -1;
        }

        for (; len != 0; --len) {
                if (ptr_put(stdio_base, *ptr++) < 0) {
                        return -1;
                }
                ++nChars;
        }
        return nChars;
}

#elif (defined(__GNUC__) && (XMEGA || MEGA))

int _write (char c, int *f);

int _write (char c, int *f)
{
        if (ptr_put(stdio_base, c) < 0) {
                return -1;
        }
        return 1;
}
#endif