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 <stdlib.h>
22 #include <string.h>
23 
24 #include "telescope.h"
25 #include "parser.h"
26 
27 static int	textplain_parse(struct parser*, const char*, size_t);
28 static int	textplain_foreach_line(struct parser*, const char*, size_t);
29 static int	textplain_free(struct parser*);
30 
31 static inline int
32 emit_line(struct parser *p, enum line_type type, const char *line, size_t len)
33 {
34 	struct line *l;
35 
36 	if ((l = calloc(1, sizeof(*l))) == NULL)
37 		return 0;
38 
39 	l->type = type;
40 
41 	if (len != 0) {
42 		if ((l->line = calloc(1, len+1)) == NULL) {
43 			free(l);
44 			return 0;
45 		}
46 
47 		memcpy(l->line, line, len);
48 	}
49 
50 	if (TAILQ_EMPTY(&p->head))
51 		TAILQ_INSERT_HEAD(&p->head, l, lines);
52 	else
53 		TAILQ_INSERT_TAIL(&p->head, l, lines);
54 
55 	return 1;
56 }
57 
58 void
59 textplain_initparser(struct parser *p)
60 {
61 	memset(p, 0, sizeof(*p));
62 
63 	p->name = "text/plain";
64 	p->parse = &textplain_parse;
65 	p->free = &textplain_free;
66 }
67 
68 static int
69 textplain_parse(struct parser *p, const char *buf, size_t size)
70 {
71 	return parser_foreach_line(p, buf, size, textplain_foreach_line);
72 }
73 
74 static int
75 textplain_foreach_line(struct parser *p, const char *line, size_t linelen)
76 {
77 	return emit_line(p, LINE_PRE_CONTENT, line, linelen);
78 }
79 
80 static int
81 textplain_free(struct parser *p)
82 {
83 	if (p->len != 0)
84 		return emit_line(p, LINE_PRE_CONTENT, p->buf, p->len);
85 	return 1;
86 }