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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:w[!fw]", TOYFLAG_USR|TOYFLAG_BIN))
config SEQ
bool "seq"
depends on TOYBOX_FLOAT
default y
help
usage: seq [-w|-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 printf-style floating point format string
-s Use sep_str as separator, default is a newline character
-w Pad to equal width with leading zeroes
*/
#define FOR_seq
#include "toys.h"
GLOBALS(
char *s, *f;
int precision;
)
// Ensure there's one %f escape with correct attributes
static void insanitize(char *f)
{
char *s = next_printf(f, 0);
if (!s) error_exit("bad -f no %%f");
if (-1 == stridx("aAeEfFgG", *s) || (s = next_printf(s, 0))) {
// The @ is a byte offset, not utf8 chars. Waiting for somebody to complain.
error_exit("bad -f '%s'@%d", f, (int)(s-f+1));
}
}
// Parse a numeric argument setting *prec to the precision of this argument.
// This reproduces the "1.234e5" precision bug from upstream.
static double parsef(char *s)
{
char *dp = strchr(s, '.');
if (dp++) TT.precision = maxof(TT.precision, strcspn(dp, "eE"));
return xstrtod(s);
}
void seq_main(void)
{
double first = 1, increment = 1, last, dd;
int i;
if (!TT.s) TT.s = "\n";
switch (toys.optc) {
case 3: increment = parsef(toys.optargs[1]);
case 2: first = parsef(*toys.optargs);
default: last = parsef(toys.optargs[toys.optc-1]);
}
// Prepare format string with appropriate precision. Can't use %g because 1e6
if (toys.optflags & FLAG_f) insanitize(TT.f);
else sprintf(TT.f = toybuf, "%%.%df", TT.precision);
// Pad to largest width
if (toys.optflags & FLAG_w) {
int len = 0;
for (i=0; i<3; i++) {
dd = (double []){first, increment, last}[i];
len = maxof(len, snprintf(0, 0, TT.f, dd));
}
sprintf(TT.f = toybuf, "%%0%d.%df", len, TT.precision);
}
// Other implementations output nothing if increment is 0 and first > last,
// but loop forever if first < last or even first == last. We output
// nothing for all three, if you want endless output use "yes".
if (!increment) return;
i = 0;
for (;;) {
// Multiply to avoid accumulating rounding errors from increment.
dd = first+i*increment;
if ((increment<0 && dd<last) || (increment>0 && dd>last)) break;
if (i++) printf("%s", TT.s);
printf(TT.f, dd);
}
if (i) printf("\n");
}
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