/********************************************************************** * Copyright (c) Digital Equipment Corporation 1984, 1985, 1986. * * All Rights Reserved. * * Reference "/usr/src/COPYRIGHT" for applicable restrictions. * **********************************************************************/ /* * SCCSID: @(#)inet_network.c 3.0 4/22/86 * Based on @(#)inet_network.c 4.2 10/7/82 */ #include <sys/types.h> #include <ctype.h> #include <netdb.h> /* * Internet network address interpretation routine. * The library routines call this routine to interpret * network numbers. */ u_long inet_network(cp) register char *cp; { u_long val, base, n; register char c; u_long parts[4], *pp = parts; register int i; again: val = 0; base = 10; if (*cp == '0') base = 8, cp++; if (*cp == 'x' || *cp == 'X') base = 16, cp++; while (c = *cp) { if (isdigit(c)) { val = (val * base) + (c - '0'); cp++; continue; } if (base == 16 && isxdigit(c)) { val = (val << 4) + (c + 10 - (islower(c) ? 'a' : 'A')); cp++; continue; } break; } if (*cp == '.') { if (pp >= parts + 4) return (-1); *pp++ = val, cp++; goto again; } if (*cp && !isspace(*cp)) return (-1); *pp++ = val; n = pp - parts; if (n > 4) return (-1); for (val = 0, i = 0; i < n; i++) { val <<= 8; val |= parts[i] & 0xff; } return (val); }