Re: How to slow down animation

blb...@cantor.math.uwaterloo.ca (Bernard Lam) writes: 

>
>	I'm just wondering how to slow down the animated files.  When I view
>the files using the 'cat' command in UNIX, it goes so fast that I can't s...
>
Following is a simple C-program I used to slow the display down, it is pretty
BSDism and I hope it will work for you. Let's say you compile this program
into an executable called slowcat, then you can try

	slowcat 1000 < your_anim_file

This will try to display at most 1000 characters per second. Notice this
program will try to perform some buffering to minimize its load. If you
are desperate for single char I/O, you may also try the dd command,

	dd if=your_anim_file bs=1

----slowcat.c-------------------------------------------------------
#include <stdio.h>
#include <sys/types.h>
#include <sys/time.h>
void
nap(unsigned int ms){
    if(ms > 0){
	struct timeval tm;
	tm.tv_sec  = ms/1000000;
	tm.tv_usec = ms%1000000;
	select(0,0,0,0,&tm);
    }
}
int
main(int argc,char *argv[]){
    char buf[1024], *p, *q, *r;
    int  len, delay = 500;
    argc--; argv++;
    if(argc-- > 0)
	if((len = atoi(*argv++))>0)
	    delay = 1000000/len;
    for(len=1024; (len==1024) && ((len = fread(buf,1,1024,stdin)) > 0);)
	for(p = buf, q = p + len, r = p; p != q; p = r){
	    for(r++;r != q;r++)
		if((*r == '\n') || (*r == '\r') || ((r - p) > 128))
		    break;
	    fwrite(p,r-p,1,stderr);
	    nap(delay * (r-p));
	}
}
-------------------------------------achille (eil...@drizzle.stanford.edu)
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