annotate toys/tac.c @ 562:4d802d438983

Match uint64_t with PRIu64 to avoid warnings on 64 bit builds.
author Rob Landley <rob@landley.net>
date Sat, 14 Apr 2012 21:27:00 -0500
parents 33ce0407ea47
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
522
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
1 /* vi: set sw=4 ts=4:
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
2 *
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
3 * tac.c - output lines in reverse order
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
4 *
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
5 * Copyright 2012 Rob Landley <rob@landley.net>
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
6 *
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
7 * Not in SUSv4.
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
8
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
9 USE_TAC(NEWTOY(tac, NULL, TOYFLAG_USR|TOYFLAG_BIN))
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
10
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
11 config TAC
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
12 bool "tac"
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
13 default y
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
14 help
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
15 usage: tac [FILE...]
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
16
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
17 Output lines in reverse order.
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
18 */
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
19
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
20 #include "toys.h"
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
21
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
22 void do_tac(int fd, char *name)
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
23 {
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
24 struct arg_list *list = NULL;
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
25 char *c;
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
26
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
27 // Read in lines
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
28 for (;;) {
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
29 struct arg_list *temp;
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
30 int len;
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
31
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
32 if (!(c = get_line(fd))) break;
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
33
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
34 len = strlen(c);
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
35 if (len && c[len-1]=='\n') c[len-1] = 0;
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
36 temp = xmalloc(sizeof(struct arg_list));
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
37 temp->next = list;
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
38 temp->arg = c;
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
39 list = temp;
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
40 }
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
41
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
42 // Play them back.
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
43 while (list) {
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
44 struct arg_list *temp = list->next;
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
45 xputs(list->arg);
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
46 free(list->arg);
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
47 free(list);
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
48 list = temp;
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
49 }
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
50 }
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
51
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
52 void tac_main(void)
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
53 {
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
54 loopfiles(toys.optargs, do_tac);
33ce0407ea47 Add tac. (Shell wrapper is smaller, but all-in-one static binary is compelling use case.)
Rob Landley <rob@landley.net>
parents:
diff changeset
55 }