142 lines
2.0 KiB
C
142 lines
2.0 KiB
C
/*
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* Copyright 2022 Oleg Borodin <borodin@unix7.org>
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*/
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#include <libopencm3/stm32/usart.h>
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#include <stdlib.h>
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#include <reent.h>
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#include <sys/stat.h>
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#include <sys/errno.h>
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#include <errno.h>
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#include <usartu.h>
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#undef errno
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extern int errno;
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char *__env[1] = { 0 };
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char **environ = __env;
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int _execve(char *name, char **argv, char **env) {
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errno = ENOMEM;
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return -1;
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}
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int _fork(void) {
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errno = EAGAIN;
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return -1;
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}
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int _getpid(void) {
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return 1;
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}
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int _kill(int pid, int sig) {
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errno = EINVAL;
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return -1;
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}
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int _exit() {
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while (1);
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}
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int _isatty(int file) {
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return 1;
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}
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int _fstat(int file, struct stat *st) {
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st->st_mode = S_IFCHR;
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return 0;
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}
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int _link(char *old, char *new) {
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errno = EMLINK;
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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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return 0;
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}
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int _open(const char *name, int flags, int mode) {
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return -1;
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}
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#define STDIN 0
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#define STDOUT 1
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#define STDERR 3
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int _read(int file, char *ptr, int len) {
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int i = 0;
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while (i < len) {
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ptr[i++] = 0;
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}
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return i;
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}
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int _write(int file, char *ptr, int len) {
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int i;
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if ((file == STDOUT) || (file == STDERR)) {
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for (i = 0; i < len; i++) {
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usart_putc(USART1, ptr[i]);
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}
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return len;
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}
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return 0;
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}
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int _stat(char *file, struct stat *st) {
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st->st_mode = S_IFCHR;
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return 0;
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}
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int _close(int file) {
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return -1;
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}
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int _times(struct tms *buf) {
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return -1;
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}
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int _unlink(char *name) {
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errno = ENOENT;
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return -1;
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}
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int _wait(int *status) {
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errno = ECHILD;
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return -1;
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}
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void *_sbrk(int incr) {
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extern const void *_heap;
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extern const void *_eheap;
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void *prev_heap;
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static void *heap = NULL;
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if (heap == NULL) {
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heap = (void *)&_heap;
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}
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void* next_heap = heap + incr;
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if (next_heap >= (void*)&_eheap) {
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errno = ENOMEM;
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return NULL;
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}
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prev_heap = heap;
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heap = next_heap;
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return (void*)prev_heap;
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}
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