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:
893 bytes
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1 | #include <resolv.h>
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2 | #include "libc.h"
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3 |
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4 | int __dn_expand(const unsigned char *base, const unsigned char *end, const unsigned char *src, char *dest, int space)
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5 | {
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6 | const unsigned char *p = src;
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7 | char *dend, *dbegin = dest;
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8 | int len = -1, i, j;
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9 | if (p==end || space <= 0) return -1;
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10 | dend = dest + (space > 254 ? 254 : space);
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11 | /* detect reference loop using an iteration counter */
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12 | for (i=0; i < end-base; i+=2) {
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13 | /* loop invariants: p<end, dest<dend */
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14 | if (*p & 0xc0) {
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15 | if (p+1==end) return -1;
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16 | j = ((p[0] & 0x3f) << 8) | p[1];
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17 | if (len < 0) len = p+2-src;
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18 | if (j >= end-base) return -1;
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19 | p = base+j;
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20 | } else if (*p) {
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21 | if (dest != dbegin) *dest++ = '.';
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22 | j = *p++;
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23 | if (j >= end-p || j >= dend-dest) return -1;
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24 | while (j--) *dest++ = *p++;
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25 | } else {
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26 | *dest = 0;
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27 | if (len < 0) len = p+1-src;
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28 | return len;
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29 | }
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30 | }
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31 | return -1;
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32 | }
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33 |
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34 | weak_alias(__dn_expand, dn_expand);
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