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#include "stdio_impl.h" size_t __stdio_read(FILE *f, unsigned char *buf, size_t len) { struct iovec iov[2] = { { .iov_base = buf, .iov_len = len - !!f->buf_size }, { .iov_base = f->buf, .iov_len = f->buf_size } }; ssize_t cnt; cnt = syscall(SYS_readv, f->fd, iov, 2); if (cnt <= 0) { f->flags |= F_EOF ^ ((F_ERR^F_EOF) & cnt); f->rpos = f->rend = 0; return cnt; } if (cnt <= iov[0].iov_len) return cnt; cnt -= iov[0].iov_len; f->rpos = f->buf; f->rend = f->buf + cnt; if (f->buf_size) buf[len-1] = *f->rpos++; return len; } |