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TRACKER4.6
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randomize.c
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C/C++ Source or Header
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1994-11-26
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79 lines
/* randomize.c
vi:ts=3 sw=3:
*/
/* $Id: randomize.c,v 4.3 1994/11/15 16:11:01 espie Exp espie $
* $Log: randomize.c,v $
* Revision 4.3 1994/11/15 16:11:01 espie
* *** empty log message ***
*
*/
/* input: a series of names (as argv[1:argc - 1])
* output: the same names, in a random order.
* with the new database lookup facility, very useful for e.g.,
* tracker `randomize *` (jukebox)
*/
#include <stdio.h>
#include <stdlib.h>
#include "defs.h"
ID("$Id: randomize.c,v 4.3 1994/11/15 16:11:01 espie Exp espie $")
/* n = random_range(max): output a number in the range 0:max - 1.
* For our purpose, we don't have to get a very random number,
* so the standard generator is alright.
*/
int random_range(max)
int max;
{
static init = 0;
/* initialize the generator to an appropriate seed eventually */
if (!init)
{
srand(time(0));
init = 1;
}
return rand()%max;
}
/* output(s): output s in a suitable format. Ideally, output() should use
* the shell quoting conventions for difficult names. Right now, it doesn't
*/
void output(s)
char *s;
{
for(; *s; s++)
switch(*s)
{
/* case ' ':
case '(':
case ')':
case '\\':
putchar('\\');
*/
default:
putchar(*s);
}
putchar(' ');
}
int main(argc, argv)
int argc;
char *argv[];
{
int i, k;
/* set up everything so that our names are in argv[0 : argc - 2] */
for (i = argc - 1, argv++; i; i--)
{
/* invariant: the remaining names are in argv[0: i - 1] */
k = random_range(i);
output(argv[k]);
argv[k] = argv[i - 1];
}
exit(0);
}