176 lines
4.1 KiB
C
176 lines
4.1 KiB
C
/******************************************************************************
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* The MIT License
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*
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* Copyright (c) 2010 Perry Hung.
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* Copyright (c) 2011, 2012 LeafLabs, LLC.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*****************************************************************************/
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/**
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* @file wirish/syscalls.c
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* @brief newlib stubs
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*
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* Low level system routines used by newlib for basic I/O and memory
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* allocation. You can override most of these.
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*/
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#include <libmaple/libmaple.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <stddef.h>
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/* If CONFIG_HEAP_START (or CONFIG_HEAP_END) isn't defined, then
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* assume _lm_heap_start (resp. _lm_heap_end) is appropriately set by
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* the linker */
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#ifndef CONFIG_HEAP_START
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extern char _lm_heap_start;
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#define CONFIG_HEAP_START ((void *)&_lm_heap_start)
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#endif
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#ifndef CONFIG_HEAP_END
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extern char _lm_heap_end;
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#define CONFIG_HEAP_END ((void *)&_lm_heap_end)
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#endif
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/*
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* _sbrk -- Increment the program break.
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*
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* Get incr bytes more RAM (for use by the heap). malloc() and
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* friends call this function behind the scenes.
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*/
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void *_sbrk(int incr) {
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static void * pbreak = NULL; /* current program break */
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void * ret;
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if (pbreak == NULL) {
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pbreak = CONFIG_HEAP_START;
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}
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if ((CONFIG_HEAP_END - pbreak < incr) ||
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(pbreak - CONFIG_HEAP_START < -incr)) {
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errno = ENOMEM;
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return (void *)-1;
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}
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ret = pbreak;
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pbreak += incr;
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return ret;
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}
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__weak int _open(const char *path, int flags, ...) {
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return 1;
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}
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__weak int _close(int fd) {
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return 0;
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}
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__weak int _fstat(int fd, 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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__weak int _isatty(int fd) {
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return 1;
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}
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__weak int isatty(int fd) {
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return 1;
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}
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__weak int _lseek(int fd, off_t pos, int whence) {
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return -1;
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}
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__weak unsigned char getch(void) {
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return 0;
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}
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__weak int _read(int fd, char *buf, size_t cnt) {
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*buf = getch();
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return 1;
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}
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__weak void putch(unsigned char c) {
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}
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__weak void cgets(char *s, int bufsize) {
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char *p;
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int c;
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int i;
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for (i = 0; i < bufsize; i++) {
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*(s+i) = 0;
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}
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// memset(s, 0, bufsize);
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p = s;
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for (p = s; p < s + bufsize-1;) {
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c = getch();
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switch (c) {
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case '\r' :
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case '\n' :
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putch('\r');
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putch('\n');
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*p = '\n';
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return;
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case '\b' :
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if (p > s) {
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*p-- = 0;
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putch('\b');
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putch(' ');
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putch('\b');
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}
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break;
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default :
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putch(c);
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*p++ = c;
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break;
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}
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}
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return;
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}
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__weak int _write(int fd, const char *buf, size_t cnt) {
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int i;
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for (i = 0; i < cnt; i++)
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putch(buf[i]);
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return cnt;
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}
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/* Override fgets() in newlib with a version that does line editing */
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__weak char *fgets(char *s, int bufsize, void *f) {
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cgets(s, bufsize);
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return s;
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}
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__weak void _exit(int exitcode) {
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while (1)
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;
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}
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