/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│ │vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│ ╞══════════════════════════════════════════════════════════════════════════════╡ │ Copyright 2020 Justine Alexandra Roberts Tunney │ │ │ │ Permission to use, copy, modify, and/or distribute this software for │ │ any purpose with or without fee is hereby granted, provided that the │ │ above copyright notice and this permission notice appear in all copies. │ │ │ │ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │ │ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │ │ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │ │ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │ │ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │ │ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │ │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │ │ PERFORMANCE OF THIS SOFTWARE. │ ╚─────────────────────────────────────────────────────────────────────────────*/ #include "libc/fmt/fmt.h" #include "libc/macros.internal.h" #include "libc/sock/internal.h" #include "libc/sock/sock.h" #include "libc/sysv/consts/af.h" #include "libc/sysv/consts/inaddr.h" #include "libc/sysv/errfuns.h" /** * Converts internet address string to binary. * * @param af can be AF_INET * @param src is the ASCII-encoded address * @param dst is where the binary-encoded net-order address goes * @return 1 on success, 0 on src malformed, or -1 w/ errno */ int inet_pton(int af, const char *src, void *dst) { uint8_t *p; int b, c, j; if (af != AF_INET) return eafnosupport(); j = 0; p = dst; p[0] = 0; while ((c = *src++)) { if (isdigit(c)) { b = c - '0' + p[j] * 10; p[j] = MIN(255, b); if (b > 255) return 0; } else if (c == '.') { if (++j == 4) return 0; p[j] = 0; } else { return 0; } } return j == 3 ? 1 : 0; }