MNRS-BM-BSP/newlib-nano/syscalls.c

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C
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2024-01-16 12:26:47 +01:00
#include <unistd.h>
#include <sys/stat.h>
extern int _end;
void* _sbrk(int incr);
int _close(int file);
int _fstat(int file, struct stat *st);
int _isatty(int fd);
int _lseek(int file, int ptr, int dir);
void _kill(int pid, int sig);
int _getpid(void);
void write_hex(int fd, unsigned long int hex);
void *_sbrk(int incr) {
static unsigned char *heap = NULL;
unsigned char *prev_heap;
if (heap == NULL) {
heap = (unsigned char *)&_end;
}
prev_heap = heap;
heap += incr;
return prev_heap;
}
int _close(int file) {
(void)file;
return -1;
}
int _fstat(int file, struct stat *st) {
(void)file;
st->st_mode = S_IFCHR;
return 0;
}
int _isatty(int fd) {
if (fd == STDOUT_FILENO || fd == STDERR_FILENO)
return 1;
return 0;
}
int _lseek(int file, int ptr, int dir) {
(void)file;
(void)ptr;
(void)dir;
return 0;
}
void _exit(int status) {
const char message[] = "\nProgam has exited with code:";
write(STDERR_FILENO, message, sizeof(message) - 1);
write_hex(STDERR_FILENO, status);
write(STDERR_FILENO, "\n", 1);
for (;;);
}
void _kill(int pid, int sig) {
(void)pid;
(void)sig;
return;
}
int _getpid(void) {
return -1;
}
void write_hex(int fd, unsigned long int hex){
uint8_t ii;
uint8_t jj;
char towrite;
write(fd , "0x", 2);
for (ii = sizeof(unsigned long int) * 2 ; ii > 0; ii--) {
jj = ii - 1;
uint8_t digit = ((hex & (0xF << (jj*4))) >> (jj*4));
towrite = digit < 0xA ? ('0' + digit) : ('A' + (digit - 0xA));
write(fd, &towrite, 1);
}
}