1 /* This is simple demonstration of how to use expat. This program 2 reads an XML document from standard input and writes a line with 3 the name of each element to standard output indenting child 4 elements by one tab stop more than their parent element. 5 It must be used with Expat compiled for UTF-8 output. 6 __ __ _ 7 ___\ \/ /_ __ __ _| |_ 8 / _ \\ /| '_ \ / _` | __| 9 | __// \| |_) | (_| | |_ 10 \___/_/\_\ .__/ \__,_|\__| 11 |_| XML parser 12 13 Copyright (c) 1997-2000 Thai Open Source Software Center Ltd 14 Copyright (c) 2001-2003 Fred L. Drake, Jr. <fdrake@users.sourceforge.net> 15 Copyright (c) 2004-2006 Karl Waclawek <karl@waclawek.net> 16 Copyright (c) 2005-2007 Steven Solie <steven@solie.ca> 17 Copyright (c) 2016-2026 Sebastian Pipping <sebastian@pipping.org> 18 Copyright (c) 2017 Rhodri James <rhodri@wildebeest.org.uk> 19 Copyright (c) 2019 Zhongyuan Zhou <zhouzhongyuan@huawei.com> 20 Licensed under the MIT license: 21 22 Permission is hereby granted, free of charge, to any person obtaining 23 a copy of this software and associated documentation files (the 24 "Software"), to deal in the Software without restriction, including 25 without limitation the rights to use, copy, modify, merge, publish, 26 distribute, sublicense, and/or sell copies of the Software, and to permit 27 persons to whom the Software is furnished to do so, subject to the 28 following conditions: 29 30 The above copyright notice and this permission notice shall be included 31 in all copies or substantial portions of the Software. 32 33 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 34 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 35 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN 36 NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 37 DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 38 OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 39 USE OR OTHER DEALINGS IN THE SOFTWARE. 40 41 SPDX-License-Identifier: MIT 42 */ 43 44 #include <inttypes.h> // PRIu64 45 #include <stdio.h> 46 #include <expat.h> 47 48 #ifdef XML_UNICODE_WCHAR_T 49 # define XML_FMT_STR "ls" 50 #else 51 # define XML_FMT_STR "s" 52 #endif 53 54 static void XMLCALL 55 startElement(void *userData, const XML_Char *name, const XML_Char **atts) { 56 int i; 57 int *const depthPtr = (int *)userData; 58 (void)atts; 59 60 for (i = 0; i < *depthPtr; i++) 61 putchar('\t'); 62 printf("%" XML_FMT_STR "\n", name); 63 *depthPtr += 1; 64 } 65 66 static void XMLCALL 67 endElement(void *userData, const XML_Char *name) { 68 int *const depthPtr = (int *)userData; 69 (void)name; 70 71 *depthPtr -= 1; 72 } 73 74 int 75 main(void) { 76 XML_Parser parser = XML_ParserCreate(NULL); 77 int done; 78 int depth = 0; 79 80 if (! parser) { 81 fprintf(stderr, "Couldn't allocate memory for parser\n"); 82 return 1; 83 } 84 85 XML_SetUserData(parser, &depth); 86 XML_SetElementHandler(parser, startElement, endElement); 87 88 do { 89 void *const buf = XML_GetBuffer(parser, BUFSIZ); 90 if (! buf) { 91 fprintf(stderr, "Couldn't allocate memory for buffer\n"); 92 XML_ParserFree(parser); 93 return 1; 94 } 95 96 const size_t len = fread(buf, 1, BUFSIZ, stdin); 97 98 if (ferror(stdin)) { 99 fprintf(stderr, "Read error\n"); 100 XML_ParserFree(parser); 101 return 1; 102 } 103 104 done = feof(stdin); 105 106 if (XML_ParseBuffer(parser, (int)len, done) == XML_STATUS_ERROR) { 107 fprintf(stderr, "Parse error at line %" PRIu64 ":\n%" XML_FMT_STR "\n", 108 XML_GetCurrentLineNumber64(parser), 109 XML_ErrorString(XML_GetErrorCode(parser))); 110 XML_ParserFree(parser); 111 return 1; 112 } 113 } while (! done); 114 115 XML_ParserFree(parser); 116 return 0; 117 } 118