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Annotation of 43BSDTahoe/games/trek/utility.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980 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: #ifndef lint
        !            19: static char sccsid[] = "@(#)utility.c  5.3 (Berkeley) 6/18/88";
        !            20: #endif /* not lint */
        !            21: 
        !            22: /*
        !            23: **  ASSORTED UTILITY ROUTINES
        !            24: */
        !            25: 
        !            26: /*
        !            27: **  BLOCK MOVE
        !            28: **
        !            29: **     Moves a block of storage of length `l' bytes from the data
        !            30: **     area pointed to by `a' to the area pointed to by `b'.
        !            31: **     Returns the address of the byte following the `b' field.
        !            32: **     Overflow of `b' is not tested.
        !            33: */
        !            34: 
        !            35: char *bmove(a, b, l)
        !            36: char   *a, *b;
        !            37: int    l;
        !            38: {
        !            39:        register int            n;
        !            40:        register char           *p, *q;
        !            41: 
        !            42:        p = a;
        !            43:        q = b;
        !            44:        n = l;
        !            45:        while (n--)
        !            46:                *q++ = *p++;
        !            47:        return (q);
        !            48: }
        !            49: 
        !            50: 
        !            51: /*
        !            52: **  STRING EQUALITY TEST
        !            53: **     null-terminated strings `a' and `b' are tested for
        !            54: **     absolute equality.
        !            55: **     returns one if equal, zero otherwise.
        !            56: */
        !            57: 
        !            58: sequal(a, b)
        !            59: char   *a, *b;
        !            60: {
        !            61:        register char           *p, *q;
        !            62: 
        !            63:        p = a;
        !            64:        q = b;
        !            65:        while (*p || *q)
        !            66:                if (*p++ != *q++)
        !            67:                        return(0);
        !            68:        return(1);
        !            69: }
        !            70: 
        !            71: 
        !            72: /*
        !            73: **  STRING CONCATENATE
        !            74: **
        !            75: **     The strings `s1' and `s2' are concatenated and stored into
        !            76: **     `s3'.  It is ok for `s1' to equal `s3', but terrible things
        !            77: **     will happen if `s2' equals `s3'.  The return value is is a
        !            78: **     pointer to the end of `s3' field.
        !            79: */
        !            80: 
        !            81: char *concat(s1, s2, s3)
        !            82: char   *s1, *s2, *s3;
        !            83: {
        !            84:        register char           *p;
        !            85:        register char           *q;
        !            86: 
        !            87:        p = s3;
        !            88:        q = s1;
        !            89:        while (*q)
        !            90:                *p++ = *q++;
        !            91:        q = s2;
        !            92:        while (*q)
        !            93:                *p++ = *q++;
        !            94:        *p = 0;
        !            95:        return (p);
        !            96: }
        !            97: 
        !            98: 
        !            99: /*
        !           100: **  FIND STRING LENGTH
        !           101: **
        !           102: **     The length of string `s' (excluding the null byte which
        !           103: **             terminates the string) is returned.
        !           104: */
        !           105: 
        !           106: length(s)
        !           107: char   *s;
        !           108: {
        !           109:        register int    l;
        !           110:        register char   *p;
        !           111: 
        !           112:        l = 0;
        !           113:        p = s;
        !           114:        while (*p++)
        !           115:                l++;
        !           116:        return(l);
        !           117: }
        !           118: 
        !           119: 
        !           120: /*
        !           121: **  SYSTEM ERROR
        !           122: */
        !           123: 
        !           124: syserr(p0, p1, p2, p3, p4, p5)
        !           125: {
        !           126:        extern int      errno;
        !           127: 
        !           128:        printf("\n\07TREK SYSERR: ");
        !           129:        printf(p0, p1, p2, p3, p4, p5);
        !           130:        printf("\n");
        !           131:        if (errno)
        !           132:                printf("\tsystem error %d\n", errno);
        !           133:        exit(-1);
        !           134: }

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