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Annotation of 43BSD/lib/libc/inet/inet_network.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  */
        !             6: 
        !             7: #if defined(LIBC_SCCS) && !defined(lint)
        !             8: static char sccsid[] = "@(#)inet_network.c     5.2 (Berkeley) 3/9/86";
        !             9: #endif LIBC_SCCS and not lint
        !            10: 
        !            11: #include <sys/types.h>
        !            12: #include <ctype.h>
        !            13: 
        !            14: /*
        !            15:  * Internet network address interpretation routine.
        !            16:  * The library routines call this routine to interpret
        !            17:  * network numbers.
        !            18:  */
        !            19: u_long
        !            20: inet_network(cp)
        !            21:        register char *cp;
        !            22: {
        !            23:        register u_long val, base, n;
        !            24:        register char c;
        !            25:        u_long parts[4], *pp = parts;
        !            26:        register int i;
        !            27: 
        !            28: again:
        !            29:        val = 0; base = 10;
        !            30:        if (*cp == '0')
        !            31:                base = 8, cp++;
        !            32:        if (*cp == 'x' || *cp == 'X')
        !            33:                base = 16, cp++;
        !            34:        while (c = *cp) {
        !            35:                if (isdigit(c)) {
        !            36:                        val = (val * base) + (c - '0');
        !            37:                        cp++;
        !            38:                        continue;
        !            39:                }
        !            40:                if (base == 16 && isxdigit(c)) {
        !            41:                        val = (val << 4) + (c + 10 - (islower(c) ? 'a' : 'A'));
        !            42:                        cp++;
        !            43:                        continue;
        !            44:                }
        !            45:                break;
        !            46:        }
        !            47:        if (*cp == '.') {
        !            48:                if (pp >= parts + 4)
        !            49:                        return (-1);
        !            50:                *pp++ = val, cp++;
        !            51:                goto again;
        !            52:        }
        !            53:        if (*cp && !isspace(*cp))
        !            54:                return (-1);
        !            55:        *pp++ = val;
        !            56:        n = pp - parts;
        !            57:        if (n > 4)
        !            58:                return (-1);
        !            59:        for (val = 0, i = 0; i < n; i++) {
        !            60:                val <<= 8;
        !            61:                val |= parts[i] & 0xff;
        !            62:        }
        !            63:        return (val);
        !            64: }

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