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83 lines
1.2 KiB
83 lines
1.2 KiB
8 years ago
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#include <errno.h>
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#include <stdio.h>
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#include <usart.h>
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#include <sys/stat.h>
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register char *stack_ptr asm("sp");
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caddr_t _sbrk(int incr)
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{
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extern char end __asm("end");
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static char *heap_end;
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char *prev_heap_end;
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if (heap_end == 0)
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heap_end = &end;
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prev_heap_end = heap_end;
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if (heap_end + incr > stack_ptr) {
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// write(1, "Heap and stack collision\n", 25);
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// abort();
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errno = ENOMEM;
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return (caddr_t) -1;
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}
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heap_end += incr;
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return (caddr_t) prev_heap_end;
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}
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/**
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* @brief Write to a file by file descriptor.
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*
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* @param fd : open file descriptor
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* @param buf : data to write
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* @param len : buffer size
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* @return number of written bytes
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*/
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int _write(int fd, const char *buf, int len)
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{
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switch (fd) {
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case 1: // stdout
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case 2: // stderr
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HAL_UART_Transmit(&huart1, (uint8_t*)buf, len, 10);
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return len;
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default:
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return 0;
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}
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}
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// region stubs
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int _read(int fd, char *buf, int len)
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{
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return 0;
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}
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int _fstat(int file, struct stat *st)
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{
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st->st_mode = S_IFCHR;
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return 0;
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}
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int _lseek(int file, int ptr, int dir)
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{
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return 0;
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}
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int _close(int file)
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{
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return -1;
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}
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int _isatty(int fd)
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{
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if (fd == 0 || fd == 1 || fd == 2)
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return 1;
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else
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return 0;
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}
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// endregion
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