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/* seq.c - Count from first to last, by increment.
*
* Copyright 2006 Rob Landley <rob@landley.net>
*
* http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/seq.html
USE_SEQ(NEWTOY(seq, "<1>3?f:s:", TOYFLAG_USR|TOYFLAG_BIN))
config SEQ
bool "seq"
depends on TOYBOX_FLOAT
default y
help
usage: seq [-f fmt_str] [-s sep_str] [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.
-f Use fmt_str as a floating point format string
-s Use sep_str as separator, default is a newline character
*/
#define FOR_seq
#include "toys.h"
GLOBALS(
char * sep;
char * fmt;
)
void seq_main(void)
{
double first, increment, last, dd;
char * sep_str = "\n";
char * fmt_str = "%g";
int output = 0;
// 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]);
}
if (toys.optflags & FLAG_f) fmt_str = TT.fmt;
if (toys.optflags & FLAG_s) sep_str = TT.sep;
// 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)
{
if (dd != first) printf("%s", sep_str);
printf(fmt_str, dd);
output = 1;
}
if (output) printf("\n");
}
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