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1 75a8a1ec 2022-02-08 op /*
2 75a8a1ec 2022-02-08 op * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
3 75a8a1ec 2022-02-08 op *
4 75a8a1ec 2022-02-08 op * Permission to use, copy, modify, and distribute this software for any
5 75a8a1ec 2022-02-08 op * purpose with or without fee is hereby granted, provided that the above
6 75a8a1ec 2022-02-08 op * copyright notice and this permission notice appear in all copies.
7 75a8a1ec 2022-02-08 op *
8 75a8a1ec 2022-02-08 op * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 75a8a1ec 2022-02-08 op * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 75a8a1ec 2022-02-08 op * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 75a8a1ec 2022-02-08 op * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 75a8a1ec 2022-02-08 op * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 75a8a1ec 2022-02-08 op * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 75a8a1ec 2022-02-08 op * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 75a8a1ec 2022-02-08 op */
16 75a8a1ec 2022-02-08 op
17 75a8a1ec 2022-02-08 op /*
18 75a8a1ec 2022-02-08 op * A streaming text/x-patch parser
19 75a8a1ec 2022-02-08 op */
20 75a8a1ec 2022-02-08 op
21 75a8a1ec 2022-02-08 op #include <stdlib.h>
22 75a8a1ec 2022-02-08 op #include <string.h>
23 75a8a1ec 2022-02-08 op
24 75a8a1ec 2022-02-08 op #include "telescope.h"
25 75a8a1ec 2022-02-08 op #include "parser.h"
26 75a8a1ec 2022-02-08 op #include "utils.h"
27 75a8a1ec 2022-02-08 op
28 75a8a1ec 2022-02-08 op static int tpatch_parse(struct parser *, const char *, size_t);
29 75a8a1ec 2022-02-08 op static int tpatch_emit_line(struct parser *, const char *, size_t);
30 75a8a1ec 2022-02-08 op static int tpatch_foreach_line(struct parser *, const char *, size_t);
31 75a8a1ec 2022-02-08 op static int tpatch_free(struct parser *);
32 75a8a1ec 2022-02-08 op
33 75a8a1ec 2022-02-08 op void
34 75a8a1ec 2022-02-08 op textpatch_initparser(struct parser *p)
35 75a8a1ec 2022-02-08 op {
36 75a8a1ec 2022-02-08 op memset(p, 0, sizeof(*p));
37 75a8a1ec 2022-02-08 op
38 75a8a1ec 2022-02-08 op p->name = "text/x-patch";
39 75a8a1ec 2022-02-08 op p->parse = &tpatch_parse;
40 75a8a1ec 2022-02-08 op p->free = &tpatch_free;
41 75a8a1ec 2022-02-08 op
42 75a8a1ec 2022-02-08 op p->flags = PARSER_IN_PATCH_HDR;
43 75a8a1ec 2022-02-08 op
44 75a8a1ec 2022-02-08 op TAILQ_INIT(&p->head);
45 75a8a1ec 2022-02-08 op }
46 75a8a1ec 2022-02-08 op
47 75a8a1ec 2022-02-08 op static int
48 75a8a1ec 2022-02-08 op tpatch_parse(struct parser *p, const char *buf, size_t size)
49 75a8a1ec 2022-02-08 op {
50 75a8a1ec 2022-02-08 op return parser_foreach_line(p, buf, size, tpatch_foreach_line);
51 75a8a1ec 2022-02-08 op }
52 75a8a1ec 2022-02-08 op
53 75a8a1ec 2022-02-08 op static int
54 75a8a1ec 2022-02-08 op tpatch_emit_line(struct parser *p, const char *line, size_t linelen)
55 75a8a1ec 2022-02-08 op {
56 75a8a1ec 2022-02-08 op struct line *l;
57 75a8a1ec 2022-02-08 op
58 75a8a1ec 2022-02-08 op if ((l = calloc(1, sizeof(*l))) == NULL)
59 75a8a1ec 2022-02-08 op return 0;
60 75a8a1ec 2022-02-08 op
61 75a8a1ec 2022-02-08 op if (p->flags & PARSER_IN_PATCH_HDR)
62 75a8a1ec 2022-02-08 op l->type = LINE_PATCH_HDR;
63 75a8a1ec 2022-02-08 op else
64 75a8a1ec 2022-02-08 op l->type = LINE_PATCH;
65 75a8a1ec 2022-02-08 op
66 75a8a1ec 2022-02-08 op if (linelen != 0) {
67 75a8a1ec 2022-02-08 op if ((l->line = calloc(1, linelen+1)) == NULL) {
68 75a8a1ec 2022-02-08 op free(l);
69 75a8a1ec 2022-02-08 op return 0;
70 75a8a1ec 2022-02-08 op }
71 75a8a1ec 2022-02-08 op
72 75a8a1ec 2022-02-08 op memcpy(l->line, line, linelen);
73 75a8a1ec 2022-02-08 op
74 75a8a1ec 2022-02-08 op if (!(p->flags & PARSER_IN_PATCH_HDR))
75 75a8a1ec 2022-02-08 op switch (*l->line) {
76 75a8a1ec 2022-02-08 op case '+':
77 75a8a1ec 2022-02-08 op l->type = LINE_PATCH_ADD;
78 75a8a1ec 2022-02-08 op break;
79 75a8a1ec 2022-02-08 op case '-':
80 75a8a1ec 2022-02-08 op l->type = LINE_PATCH_DEL;
81 75a8a1ec 2022-02-08 op break;
82 75a8a1ec 2022-02-08 op case '@':
83 75a8a1ec 2022-02-08 op l->type = LINE_PATCH_HUNK_HDR;
84 75a8a1ec 2022-02-08 op break;
85 75a8a1ec 2022-02-08 op case ' ':
86 75a8a1ec 2022-02-08 op /* context lines */
87 75a8a1ec 2022-02-08 op break;
88 75a8a1ec 2022-02-08 op default:
89 75a8a1ec 2022-02-08 op /*
90 75a8a1ec 2022-02-08 op * A single patch file can have more
91 75a8a1ec 2022-02-08 op * than one "header" if touches more
92 75a8a1ec 2022-02-08 op * than one file.
93 75a8a1ec 2022-02-08 op */
94 75a8a1ec 2022-02-08 op l->type = LINE_PATCH_HDR;
95 75a8a1ec 2022-02-08 op p->flags |= PARSER_IN_PATCH_HDR;
96 75a8a1ec 2022-02-08 op break;
97 75a8a1ec 2022-02-08 op }
98 75a8a1ec 2022-02-08 op
99 d89eb764 2022-04-24 op if (!strncmp(l->line, "+++", 3))
100 75a8a1ec 2022-02-08 op p->flags &= ~PARSER_IN_PATCH_HDR;
101 75a8a1ec 2022-02-08 op }
102 75a8a1ec 2022-02-08 op
103 75a8a1ec 2022-02-08 op TAILQ_INSERT_TAIL(&p->head, l, lines);
104 75a8a1ec 2022-02-08 op
105 75a8a1ec 2022-02-08 op return 1;
106 75a8a1ec 2022-02-08 op }
107 75a8a1ec 2022-02-08 op
108 75a8a1ec 2022-02-08 op static int
109 75a8a1ec 2022-02-08 op tpatch_foreach_line(struct parser *p, const char *line, size_t linelen)
110 75a8a1ec 2022-02-08 op {
111 75a8a1ec 2022-02-08 op return tpatch_emit_line(p, line, linelen);
112 75a8a1ec 2022-02-08 op }
113 75a8a1ec 2022-02-08 op
114 75a8a1ec 2022-02-08 op static int
115 75a8a1ec 2022-02-08 op tpatch_free(struct parser *p)
116 75a8a1ec 2022-02-08 op {
117 75a8a1ec 2022-02-08 op if (p->len != 0)
118 75a8a1ec 2022-02-08 op return tpatch_emit_line(p, p->buf, p->len);
119 75a8a1ec 2022-02-08 op return 1;
120 75a8a1ec 2022-02-08 op }