Mercurial > hg > toybox
changeset 522:33ce0407ea47
Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
author | Rob Landley <rob@landley.net> |
---|---|
date | Sun, 04 Mar 2012 16:27:21 -0600 |
parents | b64064a044a4 |
children | c5c11dff9308 |
files | toys/tac.c |
diffstat | 1 files changed, 55 insertions(+), 0 deletions(-) [+] |
line wrap: on
line diff
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/toys/tac.c Sun Mar 04 16:27:21 2012 -0600 @@ -0,0 +1,55 @@ +/* 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); +}