1 bc7cb1a1 2003-11-23 devnull #include <u.h>
2 bc7cb1a1 2003-11-23 devnull #include <libc.h>
4 bc7cb1a1 2003-11-23 devnull double min = 1.0;
5 bc7cb1a1 2003-11-23 devnull double max = 0.0;
6 bc7cb1a1 2003-11-23 devnull double incr = 1.0;
7 bc7cb1a1 2003-11-23 devnull int constant = 0;
8 bc7cb1a1 2003-11-23 devnull int nsteps;
9 bc7cb1a1 2003-11-23 devnull char *format;
12 bc7cb1a1 2003-11-23 devnull usage(void)
14 bc7cb1a1 2003-11-23 devnull fprint(2, "usage: seq [-fformat] [-w] [first [incr]] last\n");
15 bc7cb1a1 2003-11-23 devnull exits("usage");
19 bc7cb1a1 2003-11-23 devnull buildfmt(void)
22 bc7cb1a1 2003-11-23 devnull char *dp;
23 bc7cb1a1 2003-11-23 devnull int w, p, maxw, maxp;
24 bc7cb1a1 2003-11-23 devnull static char fmt[16];
25 bc7cb1a1 2003-11-23 devnull char buf[32];
27 bc7cb1a1 2003-11-23 devnull format = "%g\n";
28 bc7cb1a1 2003-11-23 devnull if(!constant)
30 bc7cb1a1 2003-11-23 devnull maxw = 0;
31 bc7cb1a1 2003-11-23 devnull maxp = 0;
32 bc7cb1a1 2003-11-23 devnull for(i=0; i<=nsteps; i++){
33 bc7cb1a1 2003-11-23 devnull sprint(buf, "%g", min+i*incr);
34 bc7cb1a1 2003-11-23 devnull if(strchr(buf, 'e')!=0)
36 bc7cb1a1 2003-11-23 devnull dp = strchr(buf,'.');
37 bc7cb1a1 2003-11-23 devnull w = dp==0? strlen(buf): dp-buf;
38 bc7cb1a1 2003-11-23 devnull p = dp==0? 0: strlen(strchr(buf,'.')+1);
39 bc7cb1a1 2003-11-23 devnull if(w>maxw)
40 bc7cb1a1 2003-11-23 devnull maxw = w;
41 bc7cb1a1 2003-11-23 devnull if(p>maxp)
42 bc7cb1a1 2003-11-23 devnull maxp = p;
44 bc7cb1a1 2003-11-23 devnull if(maxp > 0)
45 bc7cb1a1 2003-11-23 devnull maxw += maxp+1;
46 bc7cb1a1 2003-11-23 devnull sprint(fmt,"%%%d.%df\n", maxw, maxp);
47 bc7cb1a1 2003-11-23 devnull format = fmt;
51 bc7cb1a1 2003-11-23 devnull main(int argc, char *argv[]){
52 bc7cb1a1 2003-11-23 devnull int i, j, n;
53 bc7cb1a1 2003-11-23 devnull char buf[256], ffmt[4096];
55 bc7cb1a1 2003-11-23 devnull ARGBEGIN{
56 bc7cb1a1 2003-11-23 devnull case 'w':
57 bc7cb1a1 2003-11-23 devnull constant++;
59 bc7cb1a1 2003-11-23 devnull case 'f':
60 bc7cb1a1 2003-11-23 devnull format = ARGF();
61 bc7cb1a1 2003-11-23 devnull if(format[strlen(format)-1] != '\n'){
62 bc7cb1a1 2003-11-23 devnull sprint(ffmt, "%s\n", format);
63 bc7cb1a1 2003-11-23 devnull format = ffmt;
67 bc7cb1a1 2003-11-23 devnull goto out;
70 bc7cb1a1 2003-11-23 devnull if(argc<1 || argc>3)
72 bc7cb1a1 2003-11-23 devnull max = atof(argv[argc-1]);
73 bc7cb1a1 2003-11-23 devnull if(argc > 1)
74 bc7cb1a1 2003-11-23 devnull min = atof(argv[0]);
75 bc7cb1a1 2003-11-23 devnull if(argc > 2)
76 bc7cb1a1 2003-11-23 devnull incr = atof(argv[1]);
77 bc7cb1a1 2003-11-23 devnull if(incr == 0){
78 bc7cb1a1 2003-11-23 devnull fprint(2, "seq: zero increment\n");
79 bc7cb1a1 2003-11-23 devnull exits("zero increment");
81 bc7cb1a1 2003-11-23 devnull nsteps = (max-min)/incr+.5;
82 bc7cb1a1 2003-11-23 devnull if(!format)
83 bc7cb1a1 2003-11-23 devnull buildfmt();
84 bc7cb1a1 2003-11-23 devnull for(i=0; i<=nsteps; i++){
85 bc7cb1a1 2003-11-23 devnull n = sprint(buf, format, min+i*incr);
86 bc7cb1a1 2003-11-23 devnull if(constant)
87 bc7cb1a1 2003-11-23 devnull for(j=0; buf[j]==' '; j++)
88 bc7cb1a1 2003-11-23 devnull buf[j] ='0';
89 bc7cb1a1 2003-11-23 devnull write(1, buf, n);
91 bc7cb1a1 2003-11-23 devnull exits(0);