1 /*
2  * Copyright (c) 2022 Omar Polo <op@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <err.h>
18 #include <stdio.h>
19 #include <stdlib.h>
20 
21 #include "tmpl.h"
22 #include "lists.h"
23 
24 int	base(struct template *, struct tailhead *);
25 
26 int
27 my_putc(struct template *tp, int c)
28 {
29 	FILE	*fp = tp->tp_arg;
30 
31 	if (putc(c, fp) < 0)
32 		return (-1);
33 
34 	return (0);
35 }
36 
37 int
38 my_puts(struct template *tp, const char *s)
39 {
40 	FILE	*fp = tp->tp_arg;
41 
42 	if (fputs(s, fp) < 0)
43 		return (-1);
44 
45 	return (0);
46 }
47 
48 int
49 main(int argc, char **argv)
50 {
51 	struct template	*tp;
52 	struct tailhead	 head;
53 	struct entry	*np;
54 	int		 i;
55 
56 	if ((tp = template(stdout, my_puts, my_putc)) == NULL)
57 		err(1, "template");
58 
59 	TAILQ_INIT(&head);
60 	for (i = 0; i < 2; ++i) {
61 		if ((np = calloc(1, sizeof(*np))) == NULL)
62 			err(1, "calloc");
63 		if (asprintf(&np->text, "%d", i+1) == -1)
64 			err(1, "asprintf");
65 		TAILQ_INSERT_TAIL(&head, np, entries);
66 	}
67 
68 	if (base(tp, &head) == -1)
69 		return (1);
70 	puts("");
71 
72 	while ((np = TAILQ_FIRST(&head))) {
73 		TAILQ_REMOVE(&head, np, entries);
74 		free(np->text);
75 		free(np);
76 	}
77 
78 	if (base(tp, &head) == -1)
79 		return (1);
80 	puts("");
81 
82 	free(tp);
83 
84 	return (0);
85 }