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-rw-r--r--scripts/test/rev.test25
-rw-r--r--toys/other/rev.c44
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);
+}