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| -rwxr-xr-x | scripts/test/seq.test | 25 | ||||
| -rw-r--r-- | toys/seq.c | 47 |
2 files changed, 72 insertions, 0 deletions
diff --git a/scripts/test/seq.test b/scripts/test/seq.test new file mode 100755 index 00000000..d255f82d --- /dev/null +++ b/scripts/test/seq.test @@ -0,0 +1,25 @@ +#!/bin/bash + +[ -f testing.sh ] && . testing.sh + +#testing "name" "command" "result" "infile" "stdin" + +testing "seq (exit with error)" "seq 2> /dev/null || echo yes" "yes\n" "" "" +testing "seq (exit with error)" "seq 1 2 3 4 2> /dev/null || echo yes" \ + "yes\n" "" "" +testing "seq one argument" "seq 3" "1\n2\n3\n" "" "" +testing "seq two arguments" "seq 5 7" "5\n6\n7\n" "" "" +testing "seq two arguments reversed" "seq 7 5" "" "" "" +testing "seq two arguments equal" "seq 3 3" "3\n" "" "" +testing "seq two arguments equal, arbitrary negative step" "seq 1 -15 1" \ + "1\n" "" "" +testing "seq two arguments equal, arbitrary positive step" "seq 1 +15 1" \ + "1\n" "" "" +testing "seq count up by 2" "seq 4 2 8" "4\n6\n8\n" "" "" +testing "seq count down by 2" "seq 8 -2 4" "8\n6\n4\n" "" "" +testing "seq count wrong way #1" "seq 4 -2 8" "" "" "" +testing "seq count wrong way #2" "seq 8 2 4" "" "" "" +testing "seq count by .3" "seq 3 .3 4" "3\n3.3\n3.6\n3.9\n" "" "" +testing "seq count by -.9" "seq .7 -.9 -2.2" "0.7\n-0.2\n-1.1\n-2\n" "" "" +testing "seq count by zero" "seq 4 0 8 | head -n 10" "" "" "" + diff --git a/toys/seq.c b/toys/seq.c new file mode 100644 index 00000000..8eb8fb8e --- /dev/null +++ b/toys/seq.c @@ -0,0 +1,47 @@ +/* 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); + } +} |