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Annotation of 42BSD/games/trek/utility.c, revision 1.1

1.1     ! root        1: #ifndef lint
        !             2: static char sccsid[] = "@(#)utility.c  4.1     (Berkeley)      3/23/83";
        !             3: #endif not lint
        !             4: 
        !             5: /*
        !             6: **  ASSORTED UTILITY ROUTINES
        !             7: */
        !             8: 
        !             9: /*
        !            10: **  BLOCK MOVE
        !            11: **
        !            12: **     Moves a block of storage of length `l' bytes from the data
        !            13: **     area pointed to by `a' to the area pointed to by `b'.
        !            14: **     Returns the address of the byte following the `b' field.
        !            15: **     Overflow of `b' is not tested.
        !            16: */
        !            17: 
        !            18: char *bmove(a, b, l)
        !            19: char   *a, *b;
        !            20: int    l;
        !            21: {
        !            22:        register int            n;
        !            23:        register char           *p, *q;
        !            24: 
        !            25:        p = a;
        !            26:        q = b;
        !            27:        n = l;
        !            28:        while (n--)
        !            29:                *q++ = *p++;
        !            30:        return (q);
        !            31: }
        !            32: 
        !            33: 
        !            34: /*
        !            35: **  STRING EQUALITY TEST
        !            36: **     null-terminated strings `a' and `b' are tested for
        !            37: **     absolute equality.
        !            38: **     returns one if equal, zero otherwise.
        !            39: */
        !            40: 
        !            41: sequal(a, b)
        !            42: char   *a, *b;
        !            43: {
        !            44:        register char           *p, *q;
        !            45: 
        !            46:        p = a;
        !            47:        q = b;
        !            48:        while (*p || *q)
        !            49:                if (*p++ != *q++)
        !            50:                        return(0);
        !            51:        return(1);
        !            52: }
        !            53: 
        !            54: 
        !            55: /*
        !            56: **  STRING CONCATENATE
        !            57: **
        !            58: **     The strings `s1' and `s2' are concatenated and stored into
        !            59: **     `s3'.  It is ok for `s1' to equal `s3', but terrible things
        !            60: **     will happen if `s2' equals `s3'.  The return value is is a
        !            61: **     pointer to the end of `s3' field.
        !            62: */
        !            63: 
        !            64: char *concat(s1, s2, s3)
        !            65: char   *s1, *s2, *s3;
        !            66: {
        !            67:        register char           *p;
        !            68:        register char           *q;
        !            69: 
        !            70:        p = s3;
        !            71:        q = s1;
        !            72:        while (*q)
        !            73:                *p++ = *q++;
        !            74:        q = s2;
        !            75:        while (*q)
        !            76:                *p++ = *q++;
        !            77:        *p = 0;
        !            78:        return (p);
        !            79: }
        !            80: 
        !            81: 
        !            82: /*
        !            83: **  FIND STRING LENGTH
        !            84: **
        !            85: **     The length of string `s' (excluding the null byte which
        !            86: **             terminates the string) is returned.
        !            87: */
        !            88: 
        !            89: length(s)
        !            90: char   *s;
        !            91: {
        !            92:        register int    l;
        !            93:        register char   *p;
        !            94: 
        !            95:        l = 0;
        !            96:        p = s;
        !            97:        while (*p++)
        !            98:                l++;
        !            99:        return(l);
        !           100: }
        !           101: 
        !           102: 
        !           103: /*
        !           104: **  SYSTEM ERROR
        !           105: */
        !           106: 
        !           107: syserr(p0, p1, p2, p3, p4, p5)
        !           108: {
        !           109:        extern int      errno;
        !           110: 
        !           111:        printf("\n\07TREK SYSERR: ");
        !           112:        printf(p0, p1, p2, p3, p4, p5);
        !           113:        printf("\n");
        !           114:        if (errno)
        !           115:                printf("\tsystem error %d\n", errno);
        !           116:        exit(-1);
        !           117: }

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