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Annotation of 43BSD/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.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  */
        !             6: 
        !             7: #ifndef lint
        !             8: static char sccsid[] = "@(#)utility.c  5.1 (Berkeley) 5/30/85";
        !             9: #endif not lint
        !            10: 
        !            11: /*
        !            12: **  ASSORTED UTILITY ROUTINES
        !            13: */
        !            14: 
        !            15: /*
        !            16: **  BLOCK MOVE
        !            17: **
        !            18: **     Moves a block of storage of length `l' bytes from the data
        !            19: **     area pointed to by `a' to the area pointed to by `b'.
        !            20: **     Returns the address of the byte following the `b' field.
        !            21: **     Overflow of `b' is not tested.
        !            22: */
        !            23: 
        !            24: char *bmove(a, b, l)
        !            25: char   *a, *b;
        !            26: int    l;
        !            27: {
        !            28:        register int            n;
        !            29:        register char           *p, *q;
        !            30: 
        !            31:        p = a;
        !            32:        q = b;
        !            33:        n = l;
        !            34:        while (n--)
        !            35:                *q++ = *p++;
        !            36:        return (q);
        !            37: }
        !            38: 
        !            39: 
        !            40: /*
        !            41: **  STRING EQUALITY TEST
        !            42: **     null-terminated strings `a' and `b' are tested for
        !            43: **     absolute equality.
        !            44: **     returns one if equal, zero otherwise.
        !            45: */
        !            46: 
        !            47: sequal(a, b)
        !            48: char   *a, *b;
        !            49: {
        !            50:        register char           *p, *q;
        !            51: 
        !            52:        p = a;
        !            53:        q = b;
        !            54:        while (*p || *q)
        !            55:                if (*p++ != *q++)
        !            56:                        return(0);
        !            57:        return(1);
        !            58: }
        !            59: 
        !            60: 
        !            61: /*
        !            62: **  STRING CONCATENATE
        !            63: **
        !            64: **     The strings `s1' and `s2' are concatenated and stored into
        !            65: **     `s3'.  It is ok for `s1' to equal `s3', but terrible things
        !            66: **     will happen if `s2' equals `s3'.  The return value is is a
        !            67: **     pointer to the end of `s3' field.
        !            68: */
        !            69: 
        !            70: char *concat(s1, s2, s3)
        !            71: char   *s1, *s2, *s3;
        !            72: {
        !            73:        register char           *p;
        !            74:        register char           *q;
        !            75: 
        !            76:        p = s3;
        !            77:        q = s1;
        !            78:        while (*q)
        !            79:                *p++ = *q++;
        !            80:        q = s2;
        !            81:        while (*q)
        !            82:                *p++ = *q++;
        !            83:        *p = 0;
        !            84:        return (p);
        !            85: }
        !            86: 
        !            87: 
        !            88: /*
        !            89: **  FIND STRING LENGTH
        !            90: **
        !            91: **     The length of string `s' (excluding the null byte which
        !            92: **             terminates the string) is returned.
        !            93: */
        !            94: 
        !            95: length(s)
        !            96: char   *s;
        !            97: {
        !            98:        register int    l;
        !            99:        register char   *p;
        !           100: 
        !           101:        l = 0;
        !           102:        p = s;
        !           103:        while (*p++)
        !           104:                l++;
        !           105:        return(l);
        !           106: }
        !           107: 
        !           108: 
        !           109: /*
        !           110: **  SYSTEM ERROR
        !           111: */
        !           112: 
        !           113: syserr(p0, p1, p2, p3, p4, p5)
        !           114: {
        !           115:        extern int      errno;
        !           116: 
        !           117:        printf("\n\07TREK SYSERR: ");
        !           118:        printf(p0, p1, p2, p3, p4, p5);
        !           119:        printf("\n");
        !           120:        if (errno)
        !           121:                printf("\tsystem error %d\n", errno);
        !           122:        exit(-1);
        !           123: }

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