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https://github.com/jart/cosmopolitan.git
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60 lines
3.4 KiB
C
60 lines
3.4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ This is free and unencumbered software released into the public domain. │
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│ │
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│ Anyone is free to copy, modify, publish, use, compile, sell, or │
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│ distribute this software, either in source code form or as a compiled │
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│ binary, for any purpose, commercial or non-commercial, and by any │
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│ means. │
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│ │
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│ In jurisdictions that recognize copyright laws, the author or authors │
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│ of this software dedicate any and all copyright interest in the │
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│ software to the public domain. We make this dedication for the benefit │
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│ of the public at large and to the detriment of our heirs and │
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│ successors. We intend this dedication to be an overt act of │
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│ relinquishment in perpetuity of all present and future rights to this │
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│ software under copyright law. │
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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 BE LIABLE FOR ANY CLAIM, DAMAGES OR │
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│ OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, │
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│ ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR │
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│ OTHER DEALINGS IN THE SOFTWARE. │
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│ │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/dns/ent.h"
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#include "libc/dns/servicestxt.h"
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#include "libc/mem/mem.h"
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struct servent *getservbyname(const char *name, const char *proto) {
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static struct servent *ptr0, se0;
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static char s_name[DNS_NAME_MAX + 1];
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char *localproto = proto;
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int p;
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if (!ptr0) {
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se0.s_name = s_name;
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if (!(se0.s_aliases = calloc(1, sizeof(char *)))) return NULL;
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se0.s_port = 0;
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se0.s_proto = NULL;
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ptr0 = &se0;
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}
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p = LookupServicesByName(name, &localproto, ptr0->s_name, DNS_NAME_MAX, NULL);
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if (p == -1) {
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// localproto got alloc'd during the lookup?
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if (!proto && localproto != proto) free(localproto);
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return NULL;
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}
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ptr0->s_port = p;
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if (ptr0->s_proto) free(ptr0->s_proto);
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ptr0->s_proto = strdup(localproto);
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if (!proto && localproto != proto) free(localproto);
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return ptr0;
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}
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