syscalls.c

来自「ADuC系列芯片的源代码事例」· C语言 代码 · 共 44 行

/***********************************************************************/
/*  This file is part of the uVision/ARM development tools             */
/*  Copyright KEIL ELEKTRONIK GmbH 2002-2004                           */
/***********************************************************************/
/*                                                                     */
/*  SYSCALLS.C:  System Calls Remapping                                */
/*                                                                     */
/***********************************************************************/

#include <stdlib.h>


extern int putchar (int ch);
extern int getchar (void);

int read (int file, char * ptr, int len) {
  char c;
  int  i;

  for (i = 0; i < len; i++) {
    c = getchar();
    if (c == 0x0D) break;
    *ptr++ = c;
    putchar(c);
  }
  return len - i;
}

int write (int file, char * ptr, int len) {
  int i;

  for (i = 0; i < len; i++) putchar (*ptr++);
  return len;
}

int isatty (int fd) {
  return 1;
}


void _exit (int n) {
label:  goto label; /* endless loop */
}