1 /*
2 __ __ _
3 ___\ \/ /_ __ __ _| |_
4 / _ \\ /| '_ \ / _` | __|
5 | __// \| |_) | (_| | |_
6 \___/_/\_\ .__/ \__,_|\__|
7 |_| XML parser
8
9 Copyright (c) 1997-2000 Thai Open Source Software Center Ltd
10 Copyright (c) 2000 Clark Cooper <coopercc@users.sourceforge.net>
11 Copyright (c) 2001-2004 Fred L. Drake, Jr. <fdrake@users.sourceforge.net>
12 Copyright (c) 2002-2009 Karl Waclawek <karl@waclawek.net>
13 Copyright (c) 2016-2017 Sebastian Pipping <sebastian@pipping.org>
14 Copyright (c) 2017 Rhodri James <rhodri@wildebeest.org.uk>
15 Copyright (c) 2017 Franek Korta <fkorta@gmail.com>
16 Copyright (c) 2022 Sean McBride <sean@rogue-research.com>
17 Copyright (c) 2025 Hanno Böck <hanno@gentoo.org>
18 Licensed under the MIT license:
19
20 Permission is hereby granted, free of charge, to any person obtaining
21 a copy of this software and associated documentation files (the
22 "Software"), to deal in the Software without restriction, including
23 without limitation the rights to use, copy, modify, merge, publish,
24 distribute, sublicense, and/or sell copies of the Software, and to permit
25 persons to whom the Software is furnished to do so, subject to the
26 following conditions:
27
28 The above copyright notice and this permission notice shall be included
29 in all copies or substantial portions of the Software.
30
31 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
32 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
33 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
34 NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
35 DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
36 OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
37 USE OR OTHER DEALINGS IN THE SOFTWARE.
38
39 SPDX-License-Identifier: MIT
40 */
41
42 #include <sys/types.h>
43 #include <sys/stat.h>
44 #include <fcntl.h>
45 #include <stdlib.h>
46 #include <stdio.h>
47
48 /* Functions close(2) and read(2) */
49 #if ! defined(_WIN32) && ! defined(_WIN64)
50 # include <unistd.h>
51 #endif
52
53 /* Function "read": */
54 #if defined(_MSC_VER)
55 # include <io.h>
56 /* https://msdn.microsoft.com/en-us/library/wyssk1bs(v=vs.100).aspx */
57 # define EXPAT_read _read
58 # define EXPAT_read_count_t int
59 # define EXPAT_read_req_t unsigned int
60 #else /* POSIX */
61 /* https://pubs.opengroup.org/onlinepubs/009695399/functions/read.html */
62 # define EXPAT_read read
63 # define EXPAT_read_count_t ssize_t
64 # define EXPAT_read_req_t size_t
65 #endif
66
67 #ifndef S_ISREG
68 # ifndef S_IFREG
69 # define S_IFREG _S_IFREG
70 # endif
71 # ifndef S_IFMT
72 # define S_IFMT _S_IFMT
73 # endif
74 # define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
75 #endif /* not S_ISREG */
76
77 #ifndef O_BINARY
78 # ifdef _O_BINARY
79 # define O_BINARY _O_BINARY
80 # else
81 # define O_BINARY 0
82 # endif
83 #endif
84
85 #include "xmltchar.h"
86 #include "filemap.h"
87
88 int
filemap(const tchar * name,void (* processor)(const void *,size_t,const tchar *,void * arg),void * arg)89 filemap(const tchar *name,
90 void (*processor)(const void *, size_t, const tchar *, void *arg),
91 void *arg) {
92 size_t nbytes;
93 int fd;
94 EXPAT_read_count_t n;
95 struct stat sb;
96 void *p;
97
98 fd = topen(name, O_RDONLY | O_BINARY);
99 if (fd < 0) {
100 tperror(name);
101 return 0;
102 }
103 if (fstat(fd, &sb) < 0) {
104 tperror(name);
105 close(fd);
106 return 0;
107 }
108 if (! S_ISREG(sb.st_mode)) {
109 ftprintf(stderr, T("%s: not a regular file\n"), name);
110 close(fd);
111 return 0;
112 }
113 if (sb.st_size > XML_MAX_CHUNK_LEN) {
114 close(fd);
115 return 2; /* Cannot be passed to XML_Parse in one go */
116 }
117
118 nbytes = sb.st_size;
119 /* malloc will return NULL with nbytes == 0, handle files with size 0 */
120 if (nbytes == 0) {
121 static const char c = '\0';
122 processor(&c, 0, name, arg);
123 close(fd);
124 return 1;
125 }
126 p = malloc(nbytes);
127 if (! p) {
128 ftprintf(stderr, T("%s: out of memory\n"), name);
129 close(fd);
130 return 0;
131 }
132 n = EXPAT_read(fd, p, (EXPAT_read_req_t)nbytes);
133 if (n < 0) {
134 tperror(name);
135 free(p);
136 close(fd);
137 return 0;
138 }
139 if (n != (EXPAT_read_count_t)nbytes) {
140 ftprintf(stderr, T("%s: read unexpected number of bytes\n"), name);
141 free(p);
142 close(fd);
143 return 0;
144 }
145 processor(p, nbytes, name, arg);
146 free(p);
147 close(fd);
148 return 1;
149 }
150