Last change
on this file since 388 was 388, checked in by coas-nagasima, 5 years ago |
Azure IoT Hub Device C SDK を使ったサンプルの追加
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Property svn:eol-style
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native
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Property svn:keywords
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Id
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Property svn:mime-type
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text/x-csrc
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File size:
893 bytes
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[388] | 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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