/* Copyright (C) 2011 Markus Kauppila This software is provided 'as-is', without any express or implied warranty. In no event will the authors be held liable for any damages arising from the use of this software. Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter it and redistribute it freely, subject to the following restrictions: 1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required. 2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software. 3. This notice may not be removed or altered from any source distribution. */ #include #include #include #include #include "xml.h" /*! Points the function which handles the output */ static LogOutputFp logger = 0; /*! * Defines structure used for "counting" open XML-tags */ typedef struct TagList { const char *tag; struct TagList *next; } TagList; static TagList *openTags = NULL; /*! * Prepend the open tags list * * \return On error returns non-zero value, otherwise zero will returned */ static int AddOpenTag(const char *tag) { TagList *openTag = SDL_malloc(sizeof(TagList)); if(openTag == NULL) { return 1; } memset(openTag, 0, sizeof(TagList)); openTag->tag = tag; // Should be fine without malloc? openTag->next = openTags; openTags = openTag; return 0; } /*! * Removes the first tag from the open tag list * * \return On error returns non-zero value, otherwise zero will returned */ static int RemoveOpenTag(const char *tag) { if(openTags == NULL) { return 1; } int retVal = 0; // Tag should always be the same as previously opened tag // It prevents opening and ending tag mismatch if(SDL_strcmp(openTags->tag, tag) == 0) { TagList *openTag = openTags; openTags = openTags->next; free(openTag); } else { printf("Debug | RemoveOpenTag(): open/end tag mismatch"); retVal = 1; } return retVal; } /*! * Debug function. Prints the contents of the open tags list. */ static void PrintOpenTags() { printf("\nOpen tags:\n"); TagList *openTag = NULL; for(openTag = openTags; openTag; openTag = openTag->next) { printf("\ttag: %s\n", openTag->tag); } } /*! * Converts the special characters ', ", <, >, and & to * corresponding entities: ' " < > and & * * \param string String to be escaped * \return Escaped string */ const char *EscapeString(const char *string) { const int bufferSize = 4096; char buffer[bufferSize]; memset(buffer, 0, bufferSize); // prevents the code doing a 'bus error' char *stringBuffer = SDL_malloc(bufferSize); strncpy(stringBuffer, string, bufferSize); // Ampersand (&) must be first, otherwise it'll mess up the other entities char *characters[] = {"&", "'", "\"", "<", ">"}; char *entities[] = {"&", "'", """, "<", ">"}; int maxCount = 5; int counter = 0; for(; counter < maxCount; ++counter) { char *character = characters[counter]; char *entity = entities[counter]; if(strstr(stringBuffer, character) == NULL) continue; char *token = strtok(stringBuffer, character); while(token) { char *nextToken = strtok(NULL, character); //! \todo use strncat and count the bytes left in the buffer strcat(buffer, token); if(nextToken) strcat(buffer, entity); token = nextToken; } memcpy(stringBuffer, buffer, bufferSize); memset(buffer, 0, bufferSize); } return stringBuffer; } /* =================== Functions to handle creation of XML elements =================== */ static const char *root; /*! Size for xml element buffer */ #define bufferSize 1024 /*! Buffer for storing the xml element under construction */ static char buffer[bufferSize]; char * XMLOpenDocument(const char *rootTag) { const char *doctype = "\n"; memset(buffer, 0, bufferSize); snprintf(buffer, bufferSize, "<%s>", rootTag); //logger(buffer); AddOpenTag(rootTag); root = rootTag; // it's fine, as long as rootTag points to static memory? const int doctypeSize = SDL_strlen(doctype); const int tagSize = SDL_strlen(buffer); const int size = doctypeSize + tagSize + 1; // extra byte for '\0' char *ret = SDL_malloc(size); // copy doctype strncpy(ret, doctype, doctypeSize); // copy tag strncpy(ret + doctypeSize, buffer, tagSize); ret[size] = '\0'; return ret; } char * XMLCloseDocument() { return XMLCloseElement(root); } char * XMLOpenElement(const char *tag) { memset(buffer, 0, bufferSize); snprintf(buffer, bufferSize, "<%s>", tag); AddOpenTag(tag); const int size = SDL_strlen(buffer); char *ret = SDL_malloc(size + 1); strncpy(ret, buffer, size); ret[size] = '\0'; return ret; } char * XMLOpenElementWithAttribute(const char *tag, Attribute *attribute) { memset(buffer, 0, bufferSize); snprintf(buffer, bufferSize, "<%s %s='%s'>", tag, attribute->attribute, attribute->value); logger(buffer); AddOpenTag(tag); const int size = SDL_strlen(buffer); char *ret = SDL_malloc(size + 1); strncpy(ret, buffer, size); ret[size] = '\0'; return ret; } char * XMLAddContent(const char *content) { const char *escapedContent = EscapeString(content); memset(buffer, 0, bufferSize); snprintf(buffer, bufferSize, "%s", escapedContent); SDL_free((char *)escapedContent); const int size = SDL_strlen(buffer); char *ret = SDL_malloc(size + 1); strncpy(ret, buffer, size); ret[size] = '\0'; return ret; } char * XMLCloseElement(const char *tag) { char *ret = SDL_malloc(bufferSize); memset(ret, 0, bufferSize); // Close the open tags with proper nesting. Closes tags until it finds // the given tag which is the last tag that will be closed TagList *openTag = openTags; while(openTag) { TagList *temp = openTag->next; memset(buffer, 0, bufferSize); snprintf(buffer, bufferSize, "", openTag->tag); // \todo use strNcat strcat(ret, buffer); //logger(buffer); const int openTagSize = SDL_strlen(openTag->tag); const int tagSize = SDL_strlen(tag); const int compSize = (openTagSize > tagSize) ? openTagSize : tagSize; int breakOut = 0; if(SDL_strncmp(openTag->tag, tag, compSize) == 0) { breakOut = 1; } RemoveOpenTag(openTag->tag); openTag = temp; if(breakOut) { break; } } return ret; }