read.c

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

#include "compiler.h"

extern volatile void *volatile stdio_base;
void (*ptr_get)(void volatile*, char*);


// IAR common implementation
#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 = "?__read"

size_t __read(int handle, unsigned char *buffer, size_t size)
{
        int nChars = 0;
        // This implementation only reads from stdin.
        // For all other file handles, it returns failure.
        if (handle != _LLIO_STDIN) {
                return _LLIO_ERROR;
        }
        for (; size > 0; --size) {
                ptr_get(stdio_base, (char*)buffer);
                buffer++;
                nChars++;
        }
        return nChars;
}

int __close(int handle)
{
        UNUSED(handle);
        return 0;
}

int remove(const char* val)
{
        UNUSED(val);
        return 0;
}

long __lseek(int handle, long val, int val2)
{
        UNUSED(handle);
        UNUSED(val2);
        return val;
}

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

// GCC AVR32 and SAM implementation
#elif (defined(__GNUC__) && !XMEGA && !MEGA) 

int __attribute__((weak))
_read (int file, char * ptr, int len); // Remove GCC compiler warning

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

        if (file != 0) {
                return -1;
        }

        for (; len > 0; --len) {
                ptr_get(stdio_base, ptr);
                ptr++;
                nChars++;
        }
        return nChars;
}

// GCC AVR implementation
#elif (defined(__GNUC__) && (XMEGA || MEGA) )

int _read (int *f); // Remove GCC compiler warning

int _read (int *f)
{
        char c;
        ptr_get(stdio_base,&c);
        return c;
}
#endif