mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-07 06:53:33 +00:00
c995838e5c
- Clean up sigaction() code - Add a port scanner example - Introduce a ParseCidr() API - Clean up our futex abstraction code - Fix a harmless integer overflow in ParseIp() - Use kernel semaphores on NetBSD to make threads much faster
58 lines
2.6 KiB
C
58 lines
2.6 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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│ Copyright 2021 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/str/str.h"
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#include "net/http/ip.h"
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/**
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* Parse IPv4 host address.
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*
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* @param n if -1 implies strlen
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* @return -1 on failure, otherwise 32-bit host-order unsigned integer
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* @see ParseCidr()
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*/
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int64_t ParseIp(const char *s, size_t n) {
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int c, j;
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size_t i;
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unsigned b, x;
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bool dotted = false;
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if (n == -1) n = s ? strlen(s) : 0;
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if (!n) return -1;
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for (b = x = j = i = 0; i < n; ++i) {
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c = s[i] & 255;
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if (isdigit(c)) {
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if (__builtin_mul_overflow(b, 10, &b) || //
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__builtin_add_overflow(b, c - '0', &b) || //
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(b > 255 && dotted)) {
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return -1;
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}
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} else if (c == '.') {
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if (b > 255) return -1;
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dotted = true;
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x <<= 8;
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x |= b;
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b = 0;
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++j;
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} else {
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return -1;
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}
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}
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x <<= 8;
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x |= b;
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return x;
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}
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