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Annotation of 43BSD/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.  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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