Last change
on this file since 413 was 398, checked in by coas-nagasima, 5 years ago |
mbedTLS版Azure IoT Hub接続サンプルのソースコードを追加
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File size:
836 bytes
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[398] | 1 | #include "stdio_impl.h"
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| 2 | #include <sys/uio.h>
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| 3 |
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| 4 | size_t __stdio_write(FILE *f, const unsigned char *buf, size_t len)
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| 5 | {
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| 6 | struct iovec iovs[2] = {
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| 7 | { .iov_base = f->wbase, .iov_len = f->wpos-f->wbase },
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| 8 | { .iov_base = (void *)buf, .iov_len = len }
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| 9 | };
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| 10 | struct iovec *iov = iovs;
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| 11 | size_t rem = iov[0].iov_len + iov[1].iov_len;
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| 12 | int iovcnt = 2;
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| 13 | ssize_t cnt;
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| 14 | for (;;) {
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| 15 | cnt = syscall(SYS_writev, f->fd, iov, iovcnt);
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| 16 | if (cnt == rem) {
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| 17 | f->wend = f->buf + f->buf_size;
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| 18 | f->wpos = f->wbase = f->buf;
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| 19 | return len;
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| 20 | }
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| 21 | if (cnt < 0) {
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| 22 | f->wpos = f->wbase = f->wend = 0;
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| 23 | f->flags |= F_ERR;
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| 24 | return iovcnt == 2 ? 0 : len-iov[0].iov_len;
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| 25 | }
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| 26 | rem -= cnt;
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| 27 | if (cnt > iov[0].iov_len) {
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| 28 | cnt -= iov[0].iov_len;
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| 29 | iov++; iovcnt--;
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| 30 | }
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| 31 | iov[0].iov_base = (char *)iov[0].iov_base + cnt;
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| 32 | iov[0].iov_len -= cnt;
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| 33 | }
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| 34 | return -1;
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| 35 | }
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