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-rw-r--r--toys/seq.c47
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+/* 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);
+ }
+}