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