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1 #include <resolv.h> | 1 #include <resolv.h> |
2 #include "libc.h" | 2 #include "libc.h" |
3 | 3 |
4 int __dn_expand(const unsigned char *base, const unsigned char *end, const unsig
ned char *src, char *dest, int space) | 4 int __dn_expand(const unsigned char* base, |
5 { | 5 const unsigned char* end, |
6 » const unsigned char *p = src; | 6 const unsigned char* src, |
7 » char *dend, *dbegin = dest; | 7 char* dest, |
8 » int len = -1, i, j; | 8 int space) { |
9 » if (p==end || space <= 0) return -1; | 9 const unsigned char* p = src; |
10 » dend = dest + (space > 254 ? 254 : space); | 10 char *dend, *dbegin = dest; |
11 » /* detect reference loop using an iteration counter */ | 11 int len = -1, i, j; |
12 » for (i=0; i < end-base; i+=2) { | 12 if (p == end || space <= 0) |
13 » » /* loop invariants: p<end, dest<dend */ | 13 return -1; |
14 » » if (*p & 0xc0) { | 14 dend = dest + (space > 254 ? 254 : space); |
15 » » » if (p+1==end) return -1; | 15 /* detect reference loop using an iteration counter */ |
16 » » » j = ((p[0] & 0x3f) << 8) | p[1]; | 16 for (i = 0; i < end - base; i += 2) { |
17 » » » if (len < 0) len = p+2-src; | 17 /* loop invariants: p<end, dest<dend */ |
18 » » » if (j >= end-base) return -1; | 18 if (*p & 0xc0) { |
19 » » » p = base+j; | 19 if (p + 1 == end) |
20 » » } else if (*p) { | 20 return -1; |
21 » » » if (dest != dbegin) *dest++ = '.'; | 21 j = ((p[0] & 0x3f) << 8) | p[1]; |
22 » » » j = *p++; | 22 if (len < 0) |
23 » » » if (j >= end-p || j >= dend-dest) return -1; | 23 len = p + 2 - src; |
24 » » » while (j--) *dest++ = *p++; | 24 if (j >= end - base) |
25 » » } else { | 25 return -1; |
26 » » » *dest = 0; | 26 p = base + j; |
27 » » » if (len < 0) len = p+1-src; | 27 } else if (*p) { |
28 » » » return len; | 28 if (dest != dbegin) |
29 » » } | 29 *dest++ = '.'; |
30 » } | 30 j = *p++; |
31 » return -1; | 31 if (j >= end - p || j >= dend - dest) |
| 32 return -1; |
| 33 while (j--) |
| 34 *dest++ = *p++; |
| 35 } else { |
| 36 *dest = 0; |
| 37 if (len < 0) |
| 38 len = p + 1 - src; |
| 39 return len; |
| 40 } |
| 41 } |
| 42 return -1; |
32 } | 43 } |
33 | 44 |
34 weak_alias(__dn_expand, dn_expand); | 45 weak_alias(__dn_expand, dn_expand); |
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