131 lines
3.0 KiB
C
131 lines
3.0 KiB
C
/* $NetBSD: inet_addr.c,v 1.1 1997/12/12 20:14:01 gwr Exp $ */
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/* Copyright (c) 1996 by Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* 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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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* CONSORTIUM 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 TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*/
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/*
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* Derived from:
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* src/lib/libc/net/inet_pton.c
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*/
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#include <sys/types.h>
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/*
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* Warning - these are not the standard definitions,
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* but are the minimum sufficient for this source.
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*/
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#define isspace(c) (((c) == ' ') || ((c) == '\t') || ((c) == '\n'))
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#define isdigit(c) (((c) >= '0') && ((c) <= '9'))
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#define isxdigit(c) (((c) >= 'A') && ((c) <= 'F'))
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#define toupper(c) ((c) & 0x5f)
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/*
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* Ascii internet address interpretation routine.
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* The value returned is in network order.
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*/
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u_int32_t
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inet_addr(src)
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const char *src;
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{
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u_int32_t val;
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int base, n;
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unsigned char c;
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u_int parts[4];
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register u_int *pp = parts;
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c = *src;
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for (;;) {
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/*
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* Collect number up to ``.''.
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* Values are specified as for C:
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* 0x=hex, 0=octal, isdigit=decimal.
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*/
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if (!isdigit(c))
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return (0);
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val = 0; base = 10;
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if (c == '0') {
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c = *++src;
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if (toupper(c) == 'X')
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base = 16, c = *++src;
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else
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base = 8;
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}
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for (;;) {
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if (isdigit(c)) {
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val = (val * base) + (c - '0');
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c = *++src;
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} else if (base == 16 && isxdigit(toupper(c))) {
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val = (val << 4) |
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(toupper(c) + 10 - 'A');
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c = *++src;
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} else
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break;
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}
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if (c == '.') {
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/*
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* Internet format:
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* a.b.c.d
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* a.b.c (with c treated as 16 bits)
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* a.b (with b treated as 24 bits)
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*/
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if (pp >= parts + 3)
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return (0);
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*pp++ = val;
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c = *++src;
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} else
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break;
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}
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/*
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* Check for trailing characters.
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*/
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if (c != '\0' && !isspace(c))
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return (0);
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/*
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* Concoct the address according to
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* the number of parts specified.
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*/
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n = pp - parts + 1;
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switch (n) {
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case 0:
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return (0); /* initial nondigit */
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case 1: /* a -- 32 bits */
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break;
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case 2: /* a.b -- 8.24 bits */
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if (val > 0xffffff)
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return (0);
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val |= parts[0] << 24;
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break;
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case 3: /* a.b.c -- 8.8.16 bits */
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if (val > 0xffff)
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return (0);
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val |= (parts[0] << 24) | (parts[1] << 16);
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break;
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case 4: /* a.b.c.d -- 8.8.8.8 bits */
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if (val > 0xff)
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return (0);
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val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
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break;
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}
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val = htonl(val);
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return (val);
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}
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