caddr_t _sbrk_r (struct _reent *r, int incr)
{
extern char end __asm ("end"); /* Defined by the linker. */
static char * heap_end;
char * prev_heap_end;
extern char _vStackTop; /* Defined by the linker. */
char * pStack;
if (heap_end == NULL){
heap_end = &end;
}
prev_heap_end = heap_end;
pStack = ( stack_ptr > heap_end ) ? stack_ptr : &_vStackTop;
if (heap_end + incr > pStack)
{
/* Some of the libstdc++-v3 tests rely upon detecting
out of memory errors, so do not abort here. */
#if 0
extern void abort (void);
_write_r( r, 1, "_sbrk: Heap and stack collision\n", 32);
while(1); /* Terminate here */
/* abort (); */
#else
errno = ENOMEM;
return (caddr_t) -1;
#endif
}
heap_end += incr;
return (caddr_t) prev_heap_end;
}
int
__swrite (void* cookie,char const *buf,int n)
{
register FILE *fp = (FILE *) cookie;
if (fp->_flags & __SAPP)
(void) _lseek_r (fp->_data, fp->_file, (off_t) 0, SEEK_END);
fp->_flags &= ~__SOFF; /* in case O_APPEND mode is set */
return _write_r (fp->_data, fp->_file, buf, n);
}
static int zero_pad(int handle ) /* 09-jan-95 */
/*******************************/
{
int rc;
long curPos, eodPos;
long bytesToWrite;
unsigned writeAmt;
char zeroBuf[PAD_SIZE];
// Pad with zeros due to lseek() past EOF (POSIX)
curPos = lseek( handle, 0L, SEEK_CUR ); /* current offset */
if( curPos == -1 )
return( -1 );
eodPos = lseek( handle, 0L, SEEK_END ); /* end of data offset */
if( eodPos == -1 )
return( -1 );
if( curPos > eodPos ) {
bytesToWrite = curPos - eodPos; /* amount to pad by */
if( bytesToWrite > 0 ) { /* only write if needed */
memset( zeroBuf, 0x00, PAD_SIZE ); /* zero out a buffer */
do { /* loop until done */
if( bytesToWrite > PAD_SIZE )
writeAmt = 512;
else
writeAmt = (unsigned)bytesToWrite;
rc = _write_r(ptr, handle, zeroBuf, writeAmt );
if( rc < 0 )
return( rc );
bytesToWrite -= writeAmt; /* more bytes written */
} while( bytesToWrite != 0 );
}
} else {
curPos = _lseek_r( ptr, handle, curPos, SEEK_SET );
if( curPos == -1 ) {
return( -1 );
}
}
return( 0 ); /* return success code */
}
int devo_fputc(int c, FILE *stream) {
long fd = (long)stream - 1;
char ch = c;
return (_write_r(NULL, fd, &ch, 1) == -1) ? -1 : c;
}
_ssize_t write( int file, const void *ptr, size_t len )
{
return _write_r( _REENT, file, ptr, len );
}