1 1ac119fb 2024-01-23 op /*
  2 1ac119fb 2024-01-23 op  * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
  3 1ac119fb 2024-01-23 op  *
  4 1ac119fb 2024-01-23 op  * Permission to use, copy, modify, and distribute this software for any
  5 1ac119fb 2024-01-23 op  * purpose with or without fee is hereby granted, provided that the above
  6 1ac119fb 2024-01-23 op  * copyright notice and this permission notice appear in all copies.
  7 1ac119fb 2024-01-23 op  *
  8 1ac119fb 2024-01-23 op  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  9 1ac119fb 2024-01-23 op  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 10 1ac119fb 2024-01-23 op  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 11 1ac119fb 2024-01-23 op  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 12 1ac119fb 2024-01-23 op  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 13 1ac119fb 2024-01-23 op  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 14 1ac119fb 2024-01-23 op  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 15 1ac119fb 2024-01-23 op  */
 16 1ac119fb 2024-01-23 op 
 17 1ac119fb 2024-01-23 op /*
 18 1ac119fb 2024-01-23 op  * A streaming text/x-patch parser
 19 1ac119fb 2024-01-23 op  */
 20 1ac119fb 2024-01-23 op 
 21 b66e7d4d 2024-02-06 op #include "compat.h"
 22 b66e7d4d 2024-02-06 op 
 23 1ac119fb 2024-01-23 op #include <stdlib.h>
 24 1ac119fb 2024-01-23 op #include <string.h>
 25 1ac119fb 2024-01-23 op 
 26 1ac119fb 2024-01-23 op #include "parser.h"
 27 1ac119fb 2024-01-23 op #include "utils.h"
 28 1ac119fb 2024-01-23 op 
 29 1ac119fb 2024-01-23 op static int	tpatch_parse(struct parser *, const char *, size_t);
 30 1ac119fb 2024-01-23 op static int	tpatch_emit_line(struct parser *, const char *, size_t);
 31 1ac119fb 2024-01-23 op static int	tpatch_foreach_line(struct parser *, const char *, size_t);
 32 1ac119fb 2024-01-23 op static int	tpatch_free(struct parser *);
 33 1ac119fb 2024-01-23 op 
 34 1ac119fb 2024-01-23 op void
 35 1ac119fb 2024-01-23 op textpatch_initparser(struct parser *p)
 36 1ac119fb 2024-01-23 op {
 37 1ac119fb 2024-01-23 op 	memset(p, 0, sizeof(*p));
 38 1ac119fb 2024-01-23 op 
 39 1ac119fb 2024-01-23 op 	p->name = "text/x-patch";
 40 1ac119fb 2024-01-23 op 	p->parse = &tpatch_parse;
 41 1ac119fb 2024-01-23 op 	p->free = &tpatch_free;
 42 1ac119fb 2024-01-23 op 
 43 1ac119fb 2024-01-23 op 	p->flags = PARSER_IN_PATCH_HDR;
 44 1ac119fb 2024-01-23 op 
 45 1ac119fb 2024-01-23 op 	TAILQ_INIT(&p->head);
 46 1ac119fb 2024-01-23 op }
 47 1ac119fb 2024-01-23 op 
 48 1ac119fb 2024-01-23 op static int
 49 1ac119fb 2024-01-23 op tpatch_parse(struct parser *p, const char *buf, size_t size)
 50 1ac119fb 2024-01-23 op {
 51 1ac119fb 2024-01-23 op 	return parser_foreach_line(p, buf, size, tpatch_foreach_line);
 52 1ac119fb 2024-01-23 op }
 53 1ac119fb 2024-01-23 op 
 54 1ac119fb 2024-01-23 op static int
 55 1ac119fb 2024-01-23 op tpatch_emit_line(struct parser *p, const char *line, size_t linelen)
 56 1ac119fb 2024-01-23 op {
 57 1ac119fb 2024-01-23 op 	struct line *l;
 58 1ac119fb 2024-01-23 op 
 59 1ac119fb 2024-01-23 op 	if ((l = calloc(1, sizeof(*l))) == NULL)
 60 1ac119fb 2024-01-23 op 		return 0;
 61 1ac119fb 2024-01-23 op 
 62 1ac119fb 2024-01-23 op 	if (p->flags & PARSER_IN_PATCH_HDR)
 63 1ac119fb 2024-01-23 op 		l->type = LINE_PATCH_HDR;
 64 1ac119fb 2024-01-23 op 	else
 65 1ac119fb 2024-01-23 op 		l->type = LINE_PATCH;
 66 1ac119fb 2024-01-23 op 
 67 1ac119fb 2024-01-23 op 	if (linelen != 0) {
 68 1ac119fb 2024-01-23 op 		if ((l->line = calloc(1, linelen+1)) == NULL) {
 69 1ac119fb 2024-01-23 op 			free(l);
 70 1ac119fb 2024-01-23 op 			return 0;
 71 1ac119fb 2024-01-23 op 		}
 72 1ac119fb 2024-01-23 op 
 73 1ac119fb 2024-01-23 op 		memcpy(l->line, line, linelen);
 74 1ac119fb 2024-01-23 op 
 75 1ac119fb 2024-01-23 op 		if (!(p->flags & PARSER_IN_PATCH_HDR))
 76 1ac119fb 2024-01-23 op 			switch (*l->line) {
 77 1ac119fb 2024-01-23 op 			case '+':
 78 1ac119fb 2024-01-23 op 				l->type = LINE_PATCH_ADD;
 79 1ac119fb 2024-01-23 op 				break;
 80 1ac119fb 2024-01-23 op 			case '-':
 81 1ac119fb 2024-01-23 op 				l->type = LINE_PATCH_DEL;
 82 1ac119fb 2024-01-23 op 				break;
 83 1ac119fb 2024-01-23 op 			case '@':
 84 1ac119fb 2024-01-23 op 				l->type = LINE_PATCH_HUNK_HDR;
 85 1ac119fb 2024-01-23 op 				break;
 86 1ac119fb 2024-01-23 op 			case ' ':
 87 1ac119fb 2024-01-23 op 				/* context lines */
 88 1ac119fb 2024-01-23 op 				break;
 89 1ac119fb 2024-01-23 op 			default:
 90 1ac119fb 2024-01-23 op 				/*
 91 1ac119fb 2024-01-23 op 				 * A single patch file can have more
 92 1ac119fb 2024-01-23 op 				 * than one "header" if touches more
 93 1ac119fb 2024-01-23 op 				 * than one file.
 94 1ac119fb 2024-01-23 op 				 */
 95 1ac119fb 2024-01-23 op 				l->type = LINE_PATCH_HDR;
 96 1ac119fb 2024-01-23 op 				p->flags |= PARSER_IN_PATCH_HDR;
 97 1ac119fb 2024-01-23 op 				break;
 98 1ac119fb 2024-01-23 op 			}
 99 1ac119fb 2024-01-23 op 
100 1ac119fb 2024-01-23 op 		if (!strncmp(l->line, "+++", 3))
101 1ac119fb 2024-01-23 op 			p->flags &= ~PARSER_IN_PATCH_HDR;
102 1ac119fb 2024-01-23 op 	}
103 1ac119fb 2024-01-23 op 
104 1ac119fb 2024-01-23 op 	TAILQ_INSERT_TAIL(&p->head, l, lines);
105 1ac119fb 2024-01-23 op 
106 1ac119fb 2024-01-23 op 	return 1;
107 1ac119fb 2024-01-23 op }
108 1ac119fb 2024-01-23 op 
109 1ac119fb 2024-01-23 op static int
110 1ac119fb 2024-01-23 op tpatch_foreach_line(struct parser *p, const char *line, size_t linelen)
111 1ac119fb 2024-01-23 op {
112 1ac119fb 2024-01-23 op 	return tpatch_emit_line(p, line, linelen);
113 1ac119fb 2024-01-23 op }
114 1ac119fb 2024-01-23 op 
115 1ac119fb 2024-01-23 op static int
116 1ac119fb 2024-01-23 op tpatch_free(struct parser *p)
117 1ac119fb 2024-01-23 op {
118 1ac119fb 2024-01-23 op 	if (p->len != 0)
119 1ac119fb 2024-01-23 op 		return tpatch_emit_line(p, p->buf, p->len);
120 1ac119fb 2024-01-23 op 	return 1;
121 1ac119fb 2024-01-23 op }