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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;
)
// Ensure there's one %f escape with correct attributes
static void insanitize(char *f)
{
char *s;
int found = 0;
for (s = f; *s; s++) {
if (*s != '%') continue;
if (*++s == '%') continue;
if (found++) break;
while (0 <= stridx("0'#-+ ", *s)) s++;
while (isdigit(*s)) s++;
if (*s == '.') s++;
while (isdigit(*s)) s++;
if (-1 == stridx("aAeEfFgG", *s)) break;
}
// The @ is a byte offset, not utf8 chars. Waiting for somebody to complain...
if (*s) error_exit("bad -f '%s'@%d", f, s-f+1);
}
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) insanitize(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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