mirror of
https://github.com/jart/cosmopolitan.git
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111 lines
4.3 KiB
C
111 lines
4.3 KiB
C
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/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8 -*-│
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│ vi: set noet ft=c ts=8 sw=8 fenc=utf-8 :vi │
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╚──────────────────────────────────────────────────────────────────────────────╝
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│ │
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│ Musl Libc │
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│ Copyright © 2005-2014 Rich Felker, et al. │
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│ │
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│ Permission is hereby granted, free of charge, to any person obtaining │
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│ a copy of this software and associated documentation files (the │
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│ "Software"), to deal in the Software without restriction, including │
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│ without limitation the rights to use, copy, modify, merge, publish, │
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│ distribute, sublicense, and/or sell copies of the Software, and to │
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│ permit persons to whom the Software is furnished to do so, subject to │
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│ the following conditions: │
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│ │
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│ The above copyright notice and this permission notice shall be │
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│ included in all copies or substantial portions of the Software. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, │
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│ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF │
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│ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. │
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│ IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY │
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│ CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, │
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│ TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE │
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│ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. │
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│ │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/errno.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/af.h"
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#include "third_party/musl/lookup.internal.h"
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#include "third_party/musl/netdb.h"
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asm(".ident\t\"\\n\\n\
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Musl libc (MIT License)\\n\
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Copyright 2005-2014 Rich Felker, et. al.\"");
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asm(".include \"libc/disclaimer.inc\"");
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errno_t gethostbyname2_r(const char *name, int af,
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struct hostent *h, char *buf, size_t buflen,
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struct hostent **res, int *err)
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{
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struct address addrs[MAXADDRS];
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char canon[256];
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int i, cnt;
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size_t align, need;
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*res = 0;
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cnt = __lookup_name(addrs, canon, name, af, AI_CANONNAME);
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if (cnt<0) switch (cnt) {
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case EAI_NONAME:
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*err = HOST_NOT_FOUND;
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return 0;
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case EAI_NODATA:
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*err = NO_DATA;
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return 0;
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case EAI_AGAIN:
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*err = TRY_AGAIN;
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return EAGAIN;
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default:
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case EAI_FAIL:
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*err = NO_RECOVERY;
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return EBADMSG;
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case EAI_SYSTEM:
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*err = NO_RECOVERY;
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return errno;
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}
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h->h_addrtype = af;
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h->h_length = af==AF_INET6 ? 16 : 4;
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/* Align buffer */
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align = -(uintptr_t)buf & (sizeof(char *)-1);
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need = 4*sizeof(char *);
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need += (cnt + 1) * (sizeof(char *) + h->h_length);
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need += strlen(name)+1;
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need += strlen(canon)+1;
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need += align;
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if (need > buflen) return ERANGE;
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buf += align;
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h->h_aliases = (void *)buf;
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buf += 3*sizeof(char *);
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h->h_addr_list = (void *)buf;
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buf += (cnt+1)*sizeof(char *);
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for (i=0; i<cnt; i++) {
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h->h_addr_list[i] = (void *)buf;
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buf += h->h_length;
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memcpy(h->h_addr_list[i], addrs[i].addr, h->h_length);
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}
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h->h_addr_list[i] = 0;
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h->h_name = h->h_aliases[0] = buf;
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strcpy(h->h_name, canon);
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buf += strlen(h->h_name)+1;
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if (strcmp(h->h_name, name)) {
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h->h_aliases[1] = buf;
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strcpy(h->h_aliases[1], name);
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buf += strlen(h->h_aliases[1])+1;
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} else h->h_aliases[1] = 0;
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h->h_aliases[2] = 0;
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*res = h;
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return 0;
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}
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