blob: ced5e8fba9fa971715e56afa99277304af0ebabd (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
/* vi: set sw=4 ts=4:
*
* seq.c - Count from first to last, by increment.
*
* Copyright 2006 Rob Landley <rob@landley.net>
*
* Not in SUSv3. (Don't ask me why not.)
USE_SEQ(NEWTOY(seq, "<1>3?", TOYFLAG_USR|TOYFLAG_BIN))
config SEQ
bool "seq"
default y
help
usage: seq [first] [increment] last
Count from first to last, by increment. Omitted arguments default
to 1. Two arguments are used as first and last. Arguments can be
negative or floating point.
*/
#include "toys.h"
void seq_main(void)
{
double first, increment, last, dd;
// Parse command line arguments, with appropriate defaults.
// Note that any non-numeric arguments are treated as zero.
first = increment = 1;
switch (toys.optc) {
case 3:
increment = atof(toys.optargs[1]);
case 2:
first = atof(*toys.optargs);
default:
last = atof(toys.optargs[toys.optc-1]);
}
// Yes, we're looping on a double. Yes rounding errors can accumulate if
// you use a non-integer increment. Deal with it.
for (dd=first; (increment>0 && dd<=last) || (increment <0 && dd>=last);
dd+=increment)
{
printf("%g\n", dd);
}
}
|
