mirror of
https://github.com/9fans/plan9port.git
synced 2025-01-15 11:20:03 +00:00
92 lines
1.4 KiB
C
92 lines
1.4 KiB
C
#include <u.h>
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#include <libc.h>
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double min = 1.0;
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double max = 0.0;
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double incr = 1.0;
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int constant = 0;
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int nsteps;
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char *format;
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void
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usage(void)
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{
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fprint(2, "usage: seq [-fformat] [-w] [first [incr]] last\n");
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exits("usage");
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}
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void
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buildfmt(void)
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{
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int i;
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char *dp;
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int w, p, maxw, maxp;
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static char fmt[16];
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char buf[32];
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format = "%g\n";
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if(!constant)
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return;
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maxw = 0;
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maxp = 0;
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for(i=0; i<=nsteps; i++){
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sprint(buf, "%g", min+i*incr);
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if(strchr(buf, 'e')!=0)
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return;
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dp = strchr(buf,'.');
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w = dp==0? strlen(buf): dp-buf;
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p = dp==0? 0: strlen(strchr(buf,'.')+1);
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if(w>maxw)
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maxw = w;
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if(p>maxp)
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maxp = p;
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}
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if(maxp > 0)
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maxw += maxp+1;
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sprint(fmt,"%%%d.%df\n", maxw, maxp);
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format = fmt;
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}
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void
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main(int argc, char *argv[]){
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int i, j, n;
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char buf[256], ffmt[4096];
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ARGBEGIN{
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case 'w':
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constant++;
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break;
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case 'f':
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format = ARGF();
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if(format[strlen(format)-1] != '\n'){
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sprint(ffmt, "%s\n", format);
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format = ffmt;
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}
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break;
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default:
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goto out;
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}ARGEND
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out:
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if(argc<1 || argc>3)
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usage();
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max = atof(argv[argc-1]);
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if(argc > 1)
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min = atof(argv[0]);
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if(argc > 2)
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incr = atof(argv[1]);
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if(incr == 0){
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fprint(2, "seq: zero increment\n");
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exits("zero increment");
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}
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nsteps = (max-min)/incr+.5;
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if(!format)
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buildfmt();
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for(i=0; i<=nsteps; i++){
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n = sprint(buf, format, min+i*incr);
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if(constant)
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for(j=0; buf[j]==' '; j++)
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buf[j] ='0';
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write(1, buf, n);
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}
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exits(0);
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}
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