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Annotation of 43BSDTahoe/lib/libc/inet/inet_network.c, revision 1.1.1.1

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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