152 lines
3.1 KiB
C
152 lines
3.1 KiB
C
/*
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* Copyright (c) 2015, Intel Corporation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1) Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2) Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3) Neither the name of Intel Corporation nor the names of its contributors
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* may be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <sys/stat.h>
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#define HEAP_SIZE 4096
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unsigned char heap[HEAP_SIZE];
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unsigned int heap_sz = 0;
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static int _stdout_hook_default(int c)
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{
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(void)(c); /* Prevent warning about unused argument */
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return EOF;
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}
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static int (*_stdout_hook)(int) = _stdout_hook_default;
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void __stdout_hook_install(int (*hook)(int))
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{
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_stdout_hook = hook;
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}
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static unsigned char _stdin_hook_default(void)
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{
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return 0;
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}
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static unsigned char (*_stdin_hook)(void) = _stdin_hook_default;
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void __stdin_hook_install(unsigned char (*hook)(void))
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{
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_stdin_hook = hook;
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}
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int read(int fd, char *buf, int nbytes)
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{
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int i = 0;
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for (i = 0; i < nbytes; i++) {
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*(buf + i) = _stdin_hook();
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if ((*(buf + i) == '\n') || (*(buf + i) == '\r')) {
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i++;
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break;
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}
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}
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return i;
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}
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int write(int fd, char *buf, int nbytes)
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{
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int i;
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for (i = 0; i < nbytes; i++) {
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if (*(buf + i) == '\n') {
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_stdout_hook('\r');
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}
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_stdout_hook(*(buf + i));
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}
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return nbytes;
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}
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int fstat(int fd, struct stat *buf)
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{
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buf->st_mode = S_IFCHR; /* Always pretend to be a tty */
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buf->st_blksize = 0;
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return 0;
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}
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int isatty(int file)
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{
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return 1;
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}
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int kill(int i, int j)
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{
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return 0;
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}
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int getpid(void)
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{
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return 0;
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}
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int _fstat(int file, struct stat *st)
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{
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st->st_mode = S_IFCHR;
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return 0;
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}
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void exit(int status)
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{
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write(1, "exit", 4);
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while (1) {
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;
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}
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}
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int close(int file)
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{
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return -1;
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}
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int lseek(int file, int ptr, int dir)
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{
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return 0;
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}
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void *sbrk(int count)
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{
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void *ptr = heap + heap_sz;
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if ((heap_sz + count) <= HEAP_SIZE) {
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heap_sz += count;
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return ptr;
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} else {
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return (void *)-1;
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}
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}
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