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:
544 bytes
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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_read(FILE *f, unsigned char *buf, size_t len)
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5 | {
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6 | struct iovec iov[2] = {
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7 | { .iov_base = buf, .iov_len = len - !!f->buf_size },
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8 | { .iov_base = f->buf, .iov_len = f->buf_size }
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9 | };
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10 | ssize_t cnt;
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11 |
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12 | cnt = syscall(SYS_readv, f->fd, iov, 2);
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13 | if (cnt <= 0) {
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14 | f->flags |= F_EOF ^ ((F_ERR^F_EOF) & cnt);
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15 | return cnt;
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16 | }
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17 | if (cnt <= iov[0].iov_len) return cnt;
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18 | cnt -= iov[0].iov_len;
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19 | f->rpos = f->buf;
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20 | f->rend = f->buf + cnt;
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21 | if (f->buf_size) buf[len-1] = *f->rpos++;
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22 | return len;
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23 | }
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