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Annotation of 43BSDTahoe/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.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  */
        !            17: 
        !            18: #if defined(LIBC_SCCS) && !defined(lint)
        !            19: static char sccsid[] = "@(#)inet_network.c     5.5 (Berkeley) 6/27/88";
        !            20: #endif /* LIBC_SCCS and not lint */
        !            21: 
        !            22: #include <sys/types.h>
        !            23: #include <netinet/in.h>
        !            24: #include <ctype.h>
        !            25: 
        !            26: /*
        !            27:  * Internet network address interpretation routine.
        !            28:  * The library routines call this routine to interpret
        !            29:  * network numbers.
        !            30:  */
        !            31: u_long
        !            32: inet_network(cp)
        !            33:        register char *cp;
        !            34: {
        !            35:        register u_long val, base, n;
        !            36:        register char c;
        !            37:        u_long parts[4], *pp = parts;
        !            38:        register int i;
        !            39: 
        !            40: again:
        !            41:        val = 0; base = 10;
        !            42:        if (*cp == '0')
        !            43:                base = 8, cp++;
        !            44:        if (*cp == 'x' || *cp == 'X')
        !            45:                base = 16, cp++;
        !            46:        while (c = *cp) {
        !            47:                if (isdigit(c)) {
        !            48:                        val = (val * base) + (c - '0');
        !            49:                        cp++;
        !            50:                        continue;
        !            51:                }
        !            52:                if (base == 16 && isxdigit(c)) {
        !            53:                        val = (val << 4) + (c + 10 - (islower(c) ? 'a' : 'A'));
        !            54:                        cp++;
        !            55:                        continue;
        !            56:                }
        !            57:                break;
        !            58:        }
        !            59:        if (*cp == '.') {
        !            60:                if (pp >= parts + 4)
        !            61:                        return (INADDR_NONE);
        !            62:                *pp++ = val, cp++;
        !            63:                goto again;
        !            64:        }
        !            65:        if (*cp && !isspace(*cp))
        !            66:                return (INADDR_NONE);
        !            67:        *pp++ = val;
        !            68:        n = pp - parts;
        !            69:        if (n > 4)
        !            70:                return (INADDR_NONE);
        !            71:        for (val = 0, i = 0; i < n; i++) {
        !            72:                val <<= 8;
        !            73:                val |= parts[i] & 0xff;
        !            74:        }
        !            75:        return (val);
        !            76: }

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