1*c9945492SAndroid Build Coastguard Worker #include "stdio_impl.h"
2*c9945492SAndroid Build Coastguard Worker #include <sys/uio.h>
3*c9945492SAndroid Build Coastguard Worker
__stdio_read(FILE * f,unsigned char * buf,size_t len)4*c9945492SAndroid Build Coastguard Worker size_t __stdio_read(FILE *f, unsigned char *buf, size_t len)
5*c9945492SAndroid Build Coastguard Worker {
6*c9945492SAndroid Build Coastguard Worker struct iovec iov[2] = {
7*c9945492SAndroid Build Coastguard Worker { .iov_base = buf, .iov_len = len - !!f->buf_size },
8*c9945492SAndroid Build Coastguard Worker { .iov_base = f->buf, .iov_len = f->buf_size }
9*c9945492SAndroid Build Coastguard Worker };
10*c9945492SAndroid Build Coastguard Worker ssize_t cnt;
11*c9945492SAndroid Build Coastguard Worker
12*c9945492SAndroid Build Coastguard Worker cnt = iov[0].iov_len ? syscall(SYS_readv, f->fd, iov, 2)
13*c9945492SAndroid Build Coastguard Worker : syscall(SYS_read, f->fd, iov[1].iov_base, iov[1].iov_len);
14*c9945492SAndroid Build Coastguard Worker if (cnt <= 0) {
15*c9945492SAndroid Build Coastguard Worker f->flags |= cnt ? F_ERR : F_EOF;
16*c9945492SAndroid Build Coastguard Worker return 0;
17*c9945492SAndroid Build Coastguard Worker }
18*c9945492SAndroid Build Coastguard Worker if (cnt <= iov[0].iov_len) return cnt;
19*c9945492SAndroid Build Coastguard Worker cnt -= iov[0].iov_len;
20*c9945492SAndroid Build Coastguard Worker f->rpos = f->buf;
21*c9945492SAndroid Build Coastguard Worker f->rend = f->buf + cnt;
22*c9945492SAndroid Build Coastguard Worker if (f->buf_size) buf[len-1] = *f->rpos++;
23*c9945492SAndroid Build Coastguard Worker return len;
24*c9945492SAndroid Build Coastguard Worker }
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