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Annotation of 43BSDReno/games/trek/utility.c, revision 1.1.1.1

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 provided
                      6:  * that: (1) source distributions retain this entire copyright notice and
                      7:  * comment, and (2) distributions including binaries display the following
                      8:  * acknowledgement:  ``This product includes software developed by the
                      9:  * University of California, Berkeley and its contributors'' in the
                     10:  * documentation or other materials provided with the distribution and in
                     11:  * all advertising materials mentioning features or use of this software.
                     12:  * Neither the name of the University nor the names of its contributors may
                     13:  * be used to endorse or promote products derived from this software without
                     14:  * specific prior written permission.
                     15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
                     16:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
                     17:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     18:  */
                     19: 
                     20: #ifndef lint
                     21: static char sccsid[] = "@(#)utility.c  5.4 (Berkeley) 6/1/90";
                     22: #endif /* not lint */
                     23: 
                     24: /*
                     25: **  ASSORTED UTILITY ROUTINES
                     26: */
                     27: 
                     28: /*
                     29: **  BLOCK MOVE
                     30: **
                     31: **     Moves a block of storage of length `l' bytes from the data
                     32: **     area pointed to by `a' to the area pointed to by `b'.
                     33: **     Returns the address of the byte following the `b' field.
                     34: **     Overflow of `b' is not tested.
                     35: */
                     36: 
                     37: char *bmove(a, b, l)
                     38: char   *a, *b;
                     39: int    l;
                     40: {
                     41:        register int            n;
                     42:        register char           *p, *q;
                     43: 
                     44:        p = a;
                     45:        q = b;
                     46:        n = l;
                     47:        while (n--)
                     48:                *q++ = *p++;
                     49:        return (q);
                     50: }
                     51: 
                     52: 
                     53: /*
                     54: **  STRING EQUALITY TEST
                     55: **     null-terminated strings `a' and `b' are tested for
                     56: **     absolute equality.
                     57: **     returns one if equal, zero otherwise.
                     58: */
                     59: 
                     60: sequal(a, b)
                     61: char   *a, *b;
                     62: {
                     63:        register char           *p, *q;
                     64: 
                     65:        p = a;
                     66:        q = b;
                     67:        while (*p || *q)
                     68:                if (*p++ != *q++)
                     69:                        return(0);
                     70:        return(1);
                     71: }
                     72: 
                     73: 
                     74: /*
                     75: **  STRING CONCATENATE
                     76: **
                     77: **     The strings `s1' and `s2' are concatenated and stored into
                     78: **     `s3'.  It is ok for `s1' to equal `s3', but terrible things
                     79: **     will happen if `s2' equals `s3'.  The return value is is a
                     80: **     pointer to the end of `s3' field.
                     81: */
                     82: 
                     83: char *concat(s1, s2, s3)
                     84: char   *s1, *s2, *s3;
                     85: {
                     86:        register char           *p;
                     87:        register char           *q;
                     88: 
                     89:        p = s3;
                     90:        q = s1;
                     91:        while (*q)
                     92:                *p++ = *q++;
                     93:        q = s2;
                     94:        while (*q)
                     95:                *p++ = *q++;
                     96:        *p = 0;
                     97:        return (p);
                     98: }
                     99: 
                    100: 
                    101: /*
                    102: **  FIND STRING LENGTH
                    103: **
                    104: **     The length of string `s' (excluding the null byte which
                    105: **             terminates the string) is returned.
                    106: */
                    107: 
                    108: length(s)
                    109: char   *s;
                    110: {
                    111:        register int    l;
                    112:        register char   *p;
                    113: 
                    114:        l = 0;
                    115:        p = s;
                    116:        while (*p++)
                    117:                l++;
                    118:        return(l);
                    119: }
                    120: 
                    121: 
                    122: /*
                    123: **  SYSTEM ERROR
                    124: */
                    125: 
                    126: syserr(p0, p1, p2, p3, p4, p5)
                    127: {
                    128:        extern int      errno;
                    129: 
                    130:        printf("\n\07TREK SYSERR: ");
                    131:        printf(p0, p1, p2, p3, p4, p5);
                    132:        printf("\n");
                    133:        if (errno)
                    134:                printf("\tsystem error %d\n", errno);
                    135:        exit(-1);
                    136: }

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