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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.
*****************************************************************************/
#include "libmaple.h"
#include <sys/stat.h>
/* _end is set in the linker command file */
extern caddr_t _end;
void uart_send(const char*str);
/*
* sbrk -- changes heap size size. Get nbytes more
* RAM. We just increment a pointer in what's
* left of memory on the board.
*/
caddr_t _sbrk(int nbytes) {
static caddr_t heap_ptr = NULL;
caddr_t base;
if (heap_ptr == NULL) {
heap_ptr = (caddr_t)&_end;
}
if ((STACK_TOP - (unsigned int)heap_ptr) >= 0) {
base = heap_ptr;
heap_ptr += nbytes;
return (base);
} else {
uart_send("heap full!\r\n");
return ((caddr_t)-1);
}
}
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) {
// while (!(USART2->SR & USART_FLAG_RXNE));
// return USART2->DR;
return 0;
}
int _read(int fd, char *buf, size_t cnt) {
*buf = getch();
return 1;
}
void putch(unsigned char c) {
// if (c == '\n') putch('\r');
// while (!(USART2->SR & USART_FLAG_TXE));
// USART2->DR = 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;
// uart_send("_write\r\n");
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) {
// uart_send("fgets\r\n");
cgets(s, bufsize);
return s;
}
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