Mercurial > hg > toybox
annotate toys/seq.c @ 304:93223118c813
Option parsing: stopearly is now a ^ prefix (not +), and an option string with
no flags auto-enables stopearly (so seq doesn't have to specify it to avoid
having negative number arguments eaten by the option parsing logic).
| author | Rob Landley <rob@landley.net> |
|---|---|
| date | Thu, 26 Jun 2008 22:48:43 -0500 |
| parents | 8350d13fba01 |
| children | 15bad33d5ded |
| rev | line source |
|---|---|
| 296 | 1 /* vi: set sw=4 ts=4: |
| 2 * | |
| 3 * seq.c - Count from first to last, by increment. | |
| 4 * | |
| 5 * Copyright 2006 Rob Landley <rob@landley.net> | |
| 6 * | |
| 7 * Not in SUSv3. (Don't ask me why not.) | |
| 8 | |
|
304
93223118c813
Option parsing: stopearly is now a ^ prefix (not +), and an option string with
Rob Landley <rob@landley.net>
parents:
296
diff
changeset
|
9 USE_SEQ(NEWTOY(seq, "<1>3?", TOYFLAG_USR|TOYFLAG_BIN)) |
| 296 | 10 |
| 11 config SEQ | |
| 12 bool "seq" | |
| 13 default y | |
| 14 help | |
| 15 usage: seq [first] [increment] last | |
| 16 | |
| 17 Count from first to last, by increment. Omitted arguments default | |
| 18 to 1. Two arguments are used as first and last. Arguments can be | |
| 19 negative or floating point. | |
| 20 */ | |
| 21 | |
| 22 #include "toys.h" | |
| 23 | |
| 24 void seq_main(void) | |
| 25 { | |
| 26 double first, increment, last, dd; | |
| 27 | |
| 28 // Parse command line arguments, with appropriate defaults. | |
| 29 // Note that any non-numeric arguments are treated as zero. | |
| 30 first = increment = 1; | |
| 31 switch (toys.optc) { | |
| 32 case 3: | |
| 33 increment = atof(toys.optargs[1]); | |
| 34 case 2: | |
| 35 first = atof(*toys.optargs); | |
| 36 default: | |
| 37 last = atof(toys.optargs[toys.optc-1]); | |
| 38 } | |
| 39 | |
| 40 // Yes, we're looping on a double. Yes rounding errors can accumulate if | |
| 41 // you use a non-integer increment. Deal with it. | |
| 42 for (dd=first; (increment>0 && dd<=last) || (increment <0 && dd>=last); | |
| 43 dd+=increment) | |
| 44 { | |
| 45 printf("%g\n", dd); | |
| 46 } | |
| 47 } |