138 lines
2.2 KiB
C
138 lines
2.2 KiB
C
/*
|
|
* Copyright (c) 2015, Intel Corporation.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <sys/stat.h>
|
|
|
|
#define HEAP_SIZE 4096
|
|
unsigned char heap[HEAP_SIZE];
|
|
unsigned int heap_sz;
|
|
|
|
static int _stdout_hook_default(int c)
|
|
{
|
|
(void)(c); /* Prevent warning about unused argument */
|
|
|
|
return EOF;
|
|
}
|
|
|
|
static int (*_stdout_hook)(int) = _stdout_hook_default;
|
|
|
|
void __stdout_hook_install(int (*hook)(int))
|
|
{
|
|
_stdout_hook = hook;
|
|
}
|
|
|
|
static unsigned char _stdin_hook_default(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static unsigned char (*_stdin_hook)(void) = _stdin_hook_default;
|
|
|
|
void __stdin_hook_install(unsigned char (*hook)(void))
|
|
{
|
|
_stdin_hook = hook;
|
|
}
|
|
|
|
int read(int fd, char *buf, int nbytes)
|
|
{
|
|
int i = 0;
|
|
|
|
for (i = 0; i < nbytes; i++) {
|
|
*(buf + i) = _stdin_hook();
|
|
if ((*(buf + i) == '\n') || (*(buf + i) == '\r')) {
|
|
i++;
|
|
break;
|
|
}
|
|
}
|
|
return i;
|
|
}
|
|
|
|
int write(int fd, char *buf, int nbytes)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < nbytes; i++) {
|
|
if (*(buf + i) == '\n') {
|
|
_stdout_hook('\r');
|
|
}
|
|
_stdout_hook(*(buf + i));
|
|
}
|
|
return nbytes;
|
|
}
|
|
|
|
int fstat(int fd, struct stat *buf)
|
|
{
|
|
buf->st_mode = S_IFCHR; /* Always pretend to be a tty */
|
|
buf->st_blksize = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int isatty(int file)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
|
|
int kill(int i, int j)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
int getpid(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
int _fstat(int file, struct stat *st)
|
|
{
|
|
st->st_mode = S_IFCHR;
|
|
return 0;
|
|
}
|
|
|
|
|
|
void exit(int status)
|
|
{
|
|
write(1, "exit", 4);
|
|
while (1) {
|
|
;
|
|
}
|
|
}
|
|
|
|
int close(int file)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
int lseek(int file, int ptr, int dir)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
void *sbrk(int count)
|
|
{
|
|
void *ptr = heap + heap_sz;
|
|
|
|
if ((heap_sz + count) <= HEAP_SIZE) {
|
|
heap_sz += count;
|
|
return ptr;
|
|
} else {
|
|
return (void *)-1;
|
|
}
|
|
}
|