Adding implementation of rev including tests

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);
+}