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greg |
1.1 |
#ifndef lint |
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greg |
1.3 |
static const char RCSid[] = "$Id: cnt.c,v 1.2 2003/06/08 12:03:09 schorsch Exp $"; |
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greg |
1.1 |
#endif |
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/* |
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* cnt.c - simple counting program. |
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* |
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* 2/1/88 |
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greg |
1.3 |
* |
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* Added -s (shuffle) option April 2022 |
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greg |
1.1 |
*/ |
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#include <stdio.h> |
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greg |
1.3 |
#include <time.h> |
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#include "random.h" |
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greg |
1.1 |
|
16 |
greg |
1.3 |
#define MAXDIM 50 |
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greg |
1.1 |
|
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char buf[256]; |
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greg |
1.3 |
/* Encode integer in string and return pointer to end */ |
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static char * |
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schorsch |
1.2 |
tack( |
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greg |
1.3 |
char *b, |
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int i |
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schorsch |
1.2 |
) |
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greg |
1.1 |
{ |
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greg |
1.3 |
char *cp; |
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greg |
1.1 |
char *res; |
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*b++ = '\t'; |
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cp = b; |
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if (i == 0) |
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*cp++ = '0'; |
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else |
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do { |
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*cp++ = i%10 + '0'; |
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i /= 10; |
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} while (i); |
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res = cp--; |
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#define c i |
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while (cp > b) { /* reverse string */ |
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c = *cp; |
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*cp-- = *b; |
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*b++ = c; |
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} |
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#undef c |
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return(res); |
49 |
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} |
50 |
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greg |
1.3 |
/* Loop over dimensions, spitting out buffer after each increment */ |
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schorsch |
1.2 |
static void |
54 |
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loop( |
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int *n, |
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char *b |
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) |
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greg |
1.1 |
{ |
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int i; |
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61 |
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if (n[0] == 0) { |
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*b = '\0'; |
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puts(buf); |
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return; |
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} |
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for (i = 0; i < n[0]; i++) |
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loop(n+1, tack(b, i)); |
68 |
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} |
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greg |
1.3 |
|
70 |
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71 |
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/* Shuffle all possible output strings and spit out randomly */ |
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static void |
73 |
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shuffle( |
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int *n |
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) |
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{ |
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int sub[MAXDIM]; |
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int ndim; |
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int alen; |
80 |
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int *myshuf; |
81 |
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int i, j; |
82 |
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83 |
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alen = 1; /* allocate shuffle index array */ |
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for (j = 0; n[j]; j++) |
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if ((alen *= n[j]) < 0) |
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exit(1); |
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88 |
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myshuf = (int *)malloc(alen*sizeof(int)); |
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if (myshuf == NULL) { |
90 |
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fputs("Insufficient memory for shuffle\n", stderr); |
91 |
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exit(1); |
92 |
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} |
93 |
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for (i = alen; i--; ) /* initialize in any order */ |
94 |
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myshuf[i] = i; |
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/* get unique starting point */ |
96 |
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srandom((long)time(0)); |
97 |
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/* perform Fisher-Yates shuffle */ |
98 |
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for (i = 0; i < alen-1; i++) { |
99 |
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int ix = random()%(alen-i) + i; |
100 |
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int ndx = myshuf[i]; |
101 |
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myshuf[i] = myshuf[ix]; |
102 |
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myshuf[ix] = ndx; |
103 |
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} |
104 |
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/* put randomly indexed output */ |
105 |
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for (i = alen; i--; ) { |
106 |
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int aval = myshuf[i]; |
107 |
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for (j = 0; n[j+1]; j++) { |
108 |
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printf("\t%d", aval % n[j]); |
109 |
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aval /= n[j]; |
110 |
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} |
111 |
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printf("\t%d\n", aval); |
112 |
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} |
113 |
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free(myshuf); |
114 |
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} |
115 |
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116 |
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117 |
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int |
118 |
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main( |
119 |
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int argc, |
120 |
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char *argv[] |
121 |
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) |
122 |
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{ |
123 |
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char *prog = argv[0]; |
124 |
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int doshuffle = 0; |
125 |
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int n[MAXDIM]; |
126 |
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int a; |
127 |
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128 |
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argv++; argc--; |
129 |
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if (argc <= 0) |
130 |
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goto userr; |
131 |
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if (argv[0][0] == '-' && argv[0][1] == 's') { |
132 |
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doshuffle = 1; |
133 |
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argv++; argc--; |
134 |
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} |
135 |
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for (a = 0; a < argc; a++) |
136 |
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if ((n[a] = atoi(argv[a])) <= 1) |
137 |
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goto userr; |
138 |
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n[a] = 0; |
139 |
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if (!a) |
140 |
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goto userr; |
141 |
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142 |
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if (doshuffle) |
143 |
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shuffle(n); |
144 |
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else |
145 |
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loop(n, buf); |
146 |
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147 |
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return(0); |
148 |
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userr: |
149 |
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fputs("Usage: ", stderr); |
150 |
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fputs(prog, stderr); |
151 |
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fputs(" [-s] N0 [N1 ..]\n", stderr); |
152 |
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return(1); |
153 |
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} |