1 /* Read an XML document from standard input and print an element
2 outline on standard output.
3 Must be used with Expat compiled for UTF-8 output.
4 __ __ _
5 ___\ \/ /_ __ __ _| |_
6 / _ \\ /| '_ \ / _` | __|
7 | __// \| |_) | (_| | |_
8 \___/_/\_\ .__/ \__,_|\__|
9 |_| XML parser
10
11 Copyright (c) 2000 Clark Cooper <coopercc@users.sourceforge.net>
12 Copyright (c) 2001-2003 Fred L. Drake, Jr. <fdrake@users.sourceforge.net>
13 Copyright (c) 2005-2007 Steven Solie <steven@solie.ca>
14 Copyright (c) 2005-2006 Karl Waclawek <karl@waclawek.net>
15 Copyright (c) 2016-2022 Sebastian Pipping <sebastian@pipping.org>
16 Copyright (c) 2017 Rhodri James <rhodri@wildebeest.org.uk>
17 Licensed under the MIT license:
18
19 Permission is hereby granted, free of charge, to any person obtaining
20 a copy of this software and associated documentation files (the
21 "Software"), to deal in the Software without restriction, including
22 without limitation the rights to use, copy, modify, merge, publish,
23 distribute, sublicense, and/or sell copies of the Software, and to permit
24 persons to whom the Software is furnished to do so, subject to the
25 following conditions:
26
27 The above copyright notice and this permission notice shall be included
28 in all copies or substantial portions of the Software.
29
30 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
31 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
32 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
33 NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
34 DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
35 OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
36 USE OR OTHER DEALINGS IN THE SOFTWARE.
37
38 SPDX-License-Identifier: MIT
39 */
40
41 #include <stdio.h>
42 #include <expat.h>
43
44 #ifdef XML_LARGE_SIZE
45 # define XML_FMT_INT_MOD "ll"
46 #else
47 # define XML_FMT_INT_MOD "l"
48 #endif
49
50 #ifdef XML_UNICODE_WCHAR_T
51 # define XML_FMT_STR "ls"
52 #else
53 # define XML_FMT_STR "s"
54 #endif
55
56 static void XMLCALL
startElement(void * userData,const XML_Char * name,const XML_Char ** atts)57 startElement(void *userData, const XML_Char *name, const XML_Char **atts) {
58 int i;
59 int *const depthPtr = (int *)userData;
60
61 for (i = 0; i < *depthPtr; i++)
62 printf(" ");
63
64 printf("%" XML_FMT_STR, name);
65
66 for (i = 0; atts[i]; i += 2) {
67 printf(" %" XML_FMT_STR "='%" XML_FMT_STR "'", atts[i], atts[i + 1]);
68 }
69
70 printf("\n");
71 *depthPtr += 1;
72 }
73
74 static void XMLCALL
endElement(void * userData,const XML_Char * name)75 endElement(void *userData, const XML_Char *name) {
76 int *const depthPtr = (int *)userData;
77 (void)name;
78
79 *depthPtr -= 1;
80 }
81
82 int
main(void)83 main(void) {
84 XML_Parser parser = XML_ParserCreate(NULL);
85 int done;
86 int depth = 0;
87
88 if (! parser) {
89 fprintf(stderr, "Couldn't allocate memory for parser\n");
90 return 1;
91 }
92
93 XML_SetUserData(parser, &depth);
94 XML_SetElementHandler(parser, startElement, endElement);
95
96 do {
97 void *const buf = XML_GetBuffer(parser, BUFSIZ);
98 if (! buf) {
99 fprintf(stderr, "Couldn't allocate memory for buffer\n");
100 XML_ParserFree(parser);
101 return 1;
102 }
103
104 const size_t len = fread(buf, 1, BUFSIZ, stdin);
105
106 if (ferror(stdin)) {
107 fprintf(stderr, "Read error\n");
108 XML_ParserFree(parser);
109 return 1;
110 }
111
112 done = feof(stdin);
113
114 if (XML_ParseBuffer(parser, (int)len, done) == XML_STATUS_ERROR) {
115 fprintf(stderr,
116 "Parse error at line %" XML_FMT_INT_MOD "u:\n%" XML_FMT_STR "\n",
117 XML_GetCurrentLineNumber(parser),
118 XML_ErrorString(XML_GetErrorCode(parser)));
119 XML_ParserFree(parser);
120 return 1;
121 }
122 } while (! done);
123
124 XML_ParserFree(parser);
125 return 0;
126 }
127