| 5 |
|
* cnt.c - simple counting program. |
| 6 |
|
* |
| 7 |
|
* 2/1/88 |
| 8 |
+ |
* |
| 9 |
+ |
* Added -s (shuffle) option April 2022 |
| 10 |
|
*/ |
| 11 |
|
|
| 12 |
|
#include <stdio.h> |
| 13 |
+ |
#include <time.h> |
| 14 |
+ |
#include "random.h" |
| 15 |
|
|
| 16 |
+ |
#define MAXDIM 50 |
| 17 |
|
|
| 13 |
– |
int n[50]; |
| 18 |
|
char buf[256]; |
| 19 |
|
|
| 20 |
|
|
| 21 |
< |
main(argc, argv) |
| 22 |
< |
int argc; |
| 23 |
< |
char *argv[]; |
| 21 |
> |
/* Encode integer in string and return pointer to end */ |
| 22 |
> |
static char * |
| 23 |
> |
tack( |
| 24 |
> |
char *b, |
| 25 |
> |
int i |
| 26 |
> |
) |
| 27 |
|
{ |
| 28 |
< |
int a; |
| 22 |
< |
|
| 23 |
< |
argv++; argc--; |
| 24 |
< |
for (a = 0; a < argc; a++) |
| 25 |
< |
n[a] = atoi(argv[a]); |
| 26 |
< |
n[a] = 0; |
| 27 |
< |
loop(n, buf); |
| 28 |
< |
|
| 29 |
< |
exit(0); |
| 30 |
< |
} |
| 31 |
< |
|
| 32 |
< |
|
| 33 |
< |
char * |
| 34 |
< |
tack(b, i) |
| 35 |
< |
register char *b; |
| 36 |
< |
register int i; |
| 37 |
< |
{ |
| 38 |
< |
register char *cp; |
| 28 |
> |
char *cp; |
| 29 |
|
char *res; |
| 30 |
|
|
| 31 |
|
*b++ = '\t'; |
| 49 |
|
} |
| 50 |
|
|
| 51 |
|
|
| 52 |
< |
loop(n, b) |
| 53 |
< |
int *n; |
| 54 |
< |
char *b; |
| 52 |
> |
/* Loop over dimensions, spitting out buffer after each increment */ |
| 53 |
> |
static void |
| 54 |
> |
loop( |
| 55 |
> |
int *n, |
| 56 |
> |
char *b |
| 57 |
> |
) |
| 58 |
|
{ |
| 59 |
|
int i; |
| 60 |
|
|
| 65 |
|
} |
| 66 |
|
for (i = 0; i < n[0]; i++) |
| 67 |
|
loop(n+1, tack(b, i)); |
| 68 |
+ |
} |
| 69 |
+ |
|
| 70 |
+ |
|
| 71 |
+ |
/* Shuffle all possible output strings and spit out randomly */ |
| 72 |
+ |
static void |
| 73 |
+ |
shuffle( |
| 74 |
+ |
int *n |
| 75 |
+ |
) |
| 76 |
+ |
{ |
| 77 |
+ |
int sub[MAXDIM]; |
| 78 |
+ |
int ndim; |
| 79 |
+ |
int alen; |
| 80 |
+ |
int *myshuf; |
| 81 |
+ |
int i, j; |
| 82 |
+ |
|
| 83 |
+ |
alen = 1; /* allocate shuffle index array */ |
| 84 |
+ |
for (j = 0; n[j]; j++) |
| 85 |
+ |
if ((alen *= n[j]) < 0) |
| 86 |
+ |
exit(1); |
| 87 |
+ |
|
| 88 |
+ |
myshuf = (int *)malloc(alen*sizeof(int)); |
| 89 |
+ |
if (myshuf == NULL) { |
| 90 |
+ |
fputs("Insufficient memory for shuffle\n", stderr); |
| 91 |
+ |
exit(1); |
| 92 |
+ |
} |
| 93 |
+ |
for (i = alen; i--; ) /* initialize in any order */ |
| 94 |
+ |
myshuf[i] = i; |
| 95 |
+ |
/* get unique starting point */ |
| 96 |
+ |
srandom((long)time(0)); |
| 97 |
+ |
/* perform Fisher-Yates shuffle */ |
| 98 |
+ |
for (i = 0; i < alen-1; i++) { |
| 99 |
+ |
int ix = random()%(alen-i) + i; |
| 100 |
+ |
int ndx = myshuf[i]; |
| 101 |
+ |
myshuf[i] = myshuf[ix]; |
| 102 |
+ |
myshuf[ix] = ndx; |
| 103 |
+ |
} |
| 104 |
+ |
/* put randomly indexed output */ |
| 105 |
+ |
for (i = alen; i--; ) { |
| 106 |
+ |
int aval = myshuf[i]; |
| 107 |
+ |
for (j = 0; n[j+1]; j++) { |
| 108 |
+ |
printf("\t%d", aval % n[j]); |
| 109 |
+ |
aval /= n[j]; |
| 110 |
+ |
} |
| 111 |
+ |
printf("\t%d\n", aval); |
| 112 |
+ |
} |
| 113 |
+ |
free(myshuf); |
| 114 |
+ |
} |
| 115 |
+ |
|
| 116 |
+ |
|
| 117 |
+ |
int |
| 118 |
+ |
main( |
| 119 |
+ |
int argc, |
| 120 |
+ |
char *argv[] |
| 121 |
+ |
) |
| 122 |
+ |
{ |
| 123 |
+ |
char *prog = argv[0]; |
| 124 |
+ |
int doshuffle = 0; |
| 125 |
+ |
int n[MAXDIM]; |
| 126 |
+ |
int a; |
| 127 |
+ |
|
| 128 |
+ |
argv++; argc--; |
| 129 |
+ |
if (argc <= 0) |
| 130 |
+ |
goto userr; |
| 131 |
+ |
if (argv[0][0] == '-' && argv[0][1] == 's') { |
| 132 |
+ |
doshuffle = 1; |
| 133 |
+ |
argv++; argc--; |
| 134 |
+ |
} |
| 135 |
+ |
for (a = 0; a < argc; a++) |
| 136 |
+ |
if ((n[a] = atoi(argv[a])) <= 1) |
| 137 |
+ |
goto userr; |
| 138 |
+ |
n[a] = 0; |
| 139 |
+ |
if (!a) |
| 140 |
+ |
goto userr; |
| 141 |
+ |
|
| 142 |
+ |
if (doshuffle) |
| 143 |
+ |
shuffle(n); |
| 144 |
+ |
else |
| 145 |
+ |
loop(n, buf); |
| 146 |
+ |
|
| 147 |
+ |
return(0); |
| 148 |
+ |
userr: |
| 149 |
+ |
fputs("Usage: ", stderr); |
| 150 |
+ |
fputs(prog, stderr); |
| 151 |
+ |
fputs(" [-s] N0 [N1 ..]\n", stderr); |
| 152 |
+ |
return(1); |
| 153 |
|
} |
