1#include "stdio_impl.h" 2#include <sys/uio.h> 3 4size_t __stdio_readx(FILE *f, unsigned char *buf, size_t len) 5{ 6 ssize_t cnt = syscall(SYS_read, f->fd, buf, len); 7 if (cnt <= 0) { 8 f->flags |= cnt ? F_ERR : F_EOF; 9 return 0; 10 } 11 return cnt; 12} 13 14size_t __stdio_read(FILE *f, unsigned char *buf, size_t len) 15{ 16 struct iovec iov_buf[2] = { 17 { .iov_base = buf, .iov_len = len - !!f->buf_size }, 18 { .iov_base = f->buf, .iov_len = f->buf_size } 19 }; 20 ssize_t cnt; 21 22 cnt = iov_buf[0].iov_len ? syscall(SYS_readv, f->fd, iov_buf, 2) 23 : syscall(SYS_read, f->fd, iov_buf[1].iov_base, iov_buf[1].iov_len); 24 if (cnt <= 0) { 25 f->flags |= cnt ? F_ERR : F_EOF; 26 return 0; 27 } 28 if (cnt <= iov_buf[0].iov_len) { 29 return cnt; 30 } 31 cnt -= iov_buf[0].iov_len; 32 f->rpos = f->buf; 33 f->rend = f->buf + cnt; 34 if (f->buf_size) buf[len-1] = *f->rpos++; 35 return len; 36} 37