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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);
}
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