mirror of
https://github.com/encounter/newlib.git
synced 2026-03-30 11:31:09 -07:00
Dave Murphy
61 lines
1.4 KiB
C
61 lines
1.4 KiB
C
#include "config.h"
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#include <_ansi.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/fcntl.h>
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#include <stdio.h>
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#include <time.h>
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#include <sys/time.h>
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#include <sys/times.h>
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#include <errno.h>
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#include <reent.h>
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#include <unistd.h>
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extern char *fake_heap_end;
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extern char *fake_heap_start;
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/* Register name faking - works in collusion with the linker. */
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register char * stack_ptr asm ("sp");
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#ifdef REENTRANT_SYSCALLS_PROVIDED
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//---------------------------------------------------------------------------------
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void * _sbrk_r (struct _reent *ptr, ptrdiff_t incr) {
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//---------------------------------------------------------------------------------
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#else
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//---------------------------------------------------------------------------------
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caddr_t _sbrk (int incr) {
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//---------------------------------------------------------------------------------
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struct _reent *ptr = _REENT;
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#endif
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extern char end asm ("__end__"); /* Defined by the linker. */
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static char * heap_start;
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char * prev_heap_start;
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char * heap_end;
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if (heap_start == NULL) {
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if (fake_heap_start == NULL) {
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heap_start = &end;
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} else {
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heap_start = fake_heap_start;
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}
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}
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prev_heap_start = heap_start;
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if (fake_heap_end == NULL) {
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heap_end = stack_ptr;
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} else {
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heap_end = fake_heap_end;
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}
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if (heap_start + incr > heap_end) {
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ptr->_errno = ENOMEM;
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return (caddr_t) -1;
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}
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heap_start += incr;
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return (caddr_t) prev_heap_start;
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}
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