diff options
| -rw-r--r-- | scripts/test/rev.test | 25 | ||||
| -rw-r--r-- | toys/other/rev.c | 44 |
2 files changed, 69 insertions, 0 deletions
diff --git a/scripts/test/rev.test b/scripts/test/rev.test new file mode 100644 index 00000000..c7622b9d --- /dev/null +++ b/scripts/test/rev.test @@ -0,0 +1,25 @@ +#!/bin/bash + +[ -f testing.sh ] && . testing.sh + +#testing "name" "command" "result" "infile" "stdin" + +echo -e "one" > file1 +echo -e "two" > file2 +testing "rev" "rev && echo yes" "orez\nyes\n" "" "zero\n" +testing "rev -" "rev - && echo yes" "orez\nyes\n" "" "zero\n" +testing "rev file1 file2" "rev file1 file2" "eno\nowt\n" "" "" +testing "rev - file" "rev - file1" "orez\neno\n" "" "zero\n" +testing "rev file -" "rev file1 -" "eno\norez\n" "" "zero\n" +testing "rev no trailing newline" "rev -" "cba\nfed\n" "" "abc\ndef" + +testing "rev file1 notfound file2" \ + "rev file1 notfound file2 2>stderr && echo ok ; cat stderr; rm stderr" \ + "eno\nowt\nrev: notfound: No such file or directory\n" "" "" + +testing "rev different input sizes"\ + "rev"\ + "\n1\n21\n321\n4321\n54321\n4321\n321\n21\n1\n\n"\ + "" "\n1\n12\n123\n1234\n12345\n1234\n123\n12\n1\n\n" + +rm file1 file2
\ No newline at end of file diff --git a/toys/other/rev.c b/toys/other/rev.c new file mode 100644 index 00000000..a95d6615 --- /dev/null +++ b/toys/other/rev.c @@ -0,0 +1,44 @@ +/* rev.c - reverse lines of a set of given input files + * + * Copyright 2012 Elie De Brauwer <eliedebrauwer@gmail.com> + +USE_REV(NEWTOY(rev, NULL, TOYFLAG_USR|TOYFLAG_BIN)) + +config REV + bool "rev" + default y + help + usage: rev [FILE...] + + Output lines reversed, when no files are given stdin is used. +*/ + +#include "toys.h" + +void do_rev(int fd, char *name) +{ + char *c; + + for (;;) { + int len; + int i; + if (!(c = get_line(fd))) break; + len = strlen(c) - 1; + i = 0; + while ( i <= len/2) + { + char tmp; + tmp = c[i]; + c[i] = c[len-i]; + c[len-i] = tmp; + i++; + } + xputs(c); + free(c); + } +} + +void rev_main(void) +{ + loopfiles(toys.optargs, do_rev); +} |