#include <unistd.h>
#include <errno.h>
#include "sys/stat.h"
#include "reent.h"
#include "bsp_init.h"
#include "libc.h"
#include "string.h"



// 寻找指定名称的设备
extern const unsigned int libc_dev_start;
extern const unsigned int libc_dev_end;
const libc_device_file *libc_find_dev(const char *name)
{
  libc_device_file *start=(libc_device_file *)&libc_dev_start;
  libc_device_file *end=(libc_device_file *)&libc_dev_end;
  
  libc_device_file *ptr=0;
  for(ptr=start;ptr<end;ptr++)
  {
    if(strcmp(ptr->name,name)==0)
      return ptr;
  }
  return NULL;
}












int _close(int fd) {
    (void)fd;
    return -1; // 不支持文件操作
}

int _read(int fd, char *buf, int nbytes) {
    (void)fd; (void)buf; (void)nbytes;
    return -1;
}

int _write(int fd, const char *buf, int nbytes) {
    (void)fd; (void)buf; (void)nbytes;
    return -1;
}

off_t _lseek(int fd, off_t offset, int whence) {
    (void)fd; (void)offset; (void)whence;
    return -1;
}

int _isatty(int fd) {
    (void)fd;
    return 1; // 假设是终端设备
}

int _open(const char *path, int flags, ...) {
    (void)path; (void)flags;
    return -1;
}

int _fstat(int fd, struct stat *st) {
    (void)fd; (void)st;
    return -1;
}

int _stat(const char *path, struct stat *st) {
    (void)path; (void)st;
    return -1;
}

int _unlink(const char *name) {
    (void)name;
    return -1;
}

int _link(const char *old, const char *new) {
    (void)old; (void)new;
    return -1;
}

int _execve(const char *name, char *const *argv, char *const *env) {
    (void)name; (void)argv; (void)env;
    errno = ENOSYS;
    return -1;
}

int _fork(void) {
    errno = ENOSYS;
    return -1;
}

int _getpid(void) {
    return 1;
}

int _wait(int *status) {
    (void)status;
    errno = ECHILD;
    return -1;
}

int _times(struct tms *buf) {
    (void)buf;
    return -1;
}

int _kill(int pid, int sig) {
    (void)pid; (void)sig;
    errno = EINVAL;
    return -1;
}

void *_sbrk(ptrdiff_t incr) {
    (void)incr;
    errno = ENOMEM;
    return (void *)-1;
}