Mercurial > hg > toybox
view toys/tac.c @ 522:33ce0407ea47
Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
author | Rob Landley <rob@landley.net> |
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date | Sun, 04 Mar 2012 16:27:21 -0600 |
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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); }