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-rw-r--r--toys/tac.c55
1 files changed, 55 insertions, 0 deletions
diff --git a/toys/tac.c b/toys/tac.c
new file mode 100644
index 00000000..cd5f83f6
--- /dev/null
+++ b/toys/tac.c
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+/* vi: set sw=4 ts=4:
+ *
+ * tac.c - output lines in reverse order
+ *
+ * Copyright 2012 Rob Landley <rob@landley.net>
+ *
+ * Not in SUSv4.
+
+USE_TAC(NEWTOY(tac, NULL, TOYFLAG_USR|TOYFLAG_BIN))
+
+config TAC
+ bool "tac"
+ default y
+ help
+ usage: tac [FILE...]
+
+ Output lines in reverse order.
+*/
+
+#include "toys.h"
+
+void do_tac(int fd, char *name)
+{
+ struct arg_list *list = NULL;
+ char *c;
+
+ // Read in lines
+ for (;;) {
+ struct arg_list *temp;
+ int len;
+
+ if (!(c = get_line(fd))) break;
+
+ len = strlen(c);
+ if (len && c[len-1]=='\n') c[len-1] = 0;
+ temp = xmalloc(sizeof(struct arg_list));
+ temp->next = list;
+ temp->arg = c;
+ list = temp;
+ }
+
+ // Play them back.
+ while (list) {
+ struct arg_list *temp = list->next;
+ xputs(list->arg);
+ free(list->arg);
+ free(list);
+ list = temp;
+ }
+}
+
+void tac_main(void)
+{
+ loopfiles(toys.optargs, do_tac);
+}