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