1 /*
2  * Copyright (c) 2021 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 /*
18  * A streaming text/plain "parser."
19  */
20 
21 #include "telescope.h"
22 
23 #include <stdlib.h>
24 #include <string.h>
25 
26 static int	textplain_parse(struct parser*, const char*, size_t);
27 static int	textplain_foreach_line(struct parser*, const char*, size_t);
28 static int	textplain_free(struct parser*);
29 
30 static inline int
31 emit_line(struct parser *p, enum line_type type, const char *line, size_t len)
32 {
33 	struct line *l;
34 
35 	if ((l = calloc(1, sizeof(*l))) == NULL)
36 		return 0;
37 
38 	l->type = type;
39 
40 	if (len != 0) {
41 		if ((l->line = calloc(1, len+1)) == NULL) {
42 			free(l);
43 			return 0;
44 		}
45 
46 		memcpy(l->line, line, len);
47 	}
48 
49 	if (TAILQ_EMPTY(&p->head))
50 		TAILQ_INSERT_HEAD(&p->head, l, lines);
51 	else
52 		TAILQ_INSERT_TAIL(&p->head, l, lines);
53 
54 	return 1;
55 }
56 
57 void
58 textplain_initparser(struct parser *p)
59 {
60 	memset(p, 0, sizeof(*p));
61 
62 	p->name = "text/plain";
63 	p->parse = &textplain_parse;
64 	p->free = &textplain_free;
65 }
66 
67 static int
68 textplain_parse(struct parser *p, const char *buf, size_t size)
69 {
70 	return parser_foreach_line(p, buf, size, textplain_foreach_line);
71 }
72 
73 static int
74 textplain_foreach_line(struct parser *p, const char *line, size_t linelen)
75 {
76 	return emit_line(p, LINE_PRE_CONTENT, line, linelen);
77 }
78 
79 static int
80 textplain_free(struct parser *p)
81 {
82 	if (p->len != 0)
83 		return emit_line(p, LINE_PRE_CONTENT, p->buf, p->len);
84 	return 1;
85 }