1 /*
2  * Copyright (c) 2022 Omar Polo <op@omarpolo.com>
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 		tp->tp_ret = -1;
33 		return (-1);
34 	}
35 
36 	return (0);
37 }
38 
39 int
40 my_puts(struct template *tp, const char *s)
41 {
42 	FILE	*fp = tp->tp_arg;
43 
44 	if (fputs(s, fp) < 0) {
45 		tp->tp_ret = -1;
46 		return (-1);
47 	}
48 
49 	return (0);
50 }
51 
52 int
53 main(int argc, char **argv)
54 {
55 	struct template	*tp;
56 	struct tailhead	 head;
57 	struct entry	*np;
58 	int		 i;
59 
60 	if ((tp = template(stdout, my_puts, my_putc)) == NULL)
61 		err(1, "template");
62 
63 	TAILQ_INIT(&head);
64 	for (i = 0; i < 2; ++i) {
65 		if ((np = calloc(1, sizeof(*np))) == NULL)
66 			err(1, "calloc");
67 		if (asprintf(&np->text, "%d", i+1) == -1)
68 			err(1, "asprintf");
69 		TAILQ_INSERT_TAIL(&head, np, entries);
70 	}
71 
72 	base(tp, &head);
73 	puts("");
74 
75 	while ((np = TAILQ_FIRST(&head))) {
76 		TAILQ_REMOVE(&head, np, entries);
77 		free(np->text);
78 		free(np);
79 	}
80 
81 	template_reset(tp);
82 
83 	base(tp, &head);
84 	puts("");
85 
86 	free(tp);
87 
88 	return (0);
89 }