/* tac.c - output lines in reverse order * * Copyright 2012 Rob Landley <rob@landley.net> 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" static void do_tac(int fd, char *name) { struct arg_list *list = NULL; char *c; // Read in lines for (;;) { struct arg_list *temp; long len; if (!(c = get_rawline(fd, &len, '\n'))) break; 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; xprintf("%s", list->arg); free(list->arg); free(list); list = temp; } } void tac_main(void) { loopfiles(toys.optargs, do_tac); }