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/* 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;
FILE *fp;
if (fd == -1) {
perror_msg_raw(name);
return;
}
// Read in lines.
fp = xfdopen(fd, "r");
for (;;) {
char *line = NULL;
size_t allocated_length;
if (getline(&line, &allocated_length, fp) <= 0) break;
struct arg_list *temp = xmalloc(sizeof(struct arg_list));
temp->next = list;
temp->arg = line;
list = temp;
}
fclose(fp);
// 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_rw(toys.optargs, O_RDONLY, 0, do_tac);
}
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