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-rw-r--r--toys/other/rev.c44
1 files changed, 44 insertions, 0 deletions
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);
+}