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Creating flexible logging system which supports XML and plain
text. Work under progress.
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/* | ||
Copyright (C) 2011 Markus Kauppila <markus.kauppila@gmail.com> | ||
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. | ||
*/ | ||
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#include <stdio.h> | ||
//#include <stdlib.h> | ||
#include <string.h> | ||
//#include <stdarg.h> | ||
#include <assert.h> | ||
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#include <SDL/SDL.h> | ||
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#include "xml.h" | ||
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/*! Points the function which handles the output */ | ||
static LogOutputFp logger = 0; | ||
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/*! | ||
* Defines structure used for "counting" open XML-tags | ||
*/ | ||
typedef struct TagList { | ||
const char *tag; | ||
struct TagList *next; | ||
} TagList; | ||
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static TagList *openTags = NULL; | ||
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/*! | ||
* 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)); | ||
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openTag->tag = tag; // Should be fine without malloc? | ||
openTag->next = openTags; | ||
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openTags = openTag; | ||
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return 0; | ||
} | ||
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/*! | ||
* 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; | ||
} | ||
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int retVal = 0; | ||
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// 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; | ||
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free(openTag); | ||
} else { | ||
printf("Debug | RemoveOpenTag(): open/end tag mismatch"); | ||
retVal = 1; | ||
} | ||
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return retVal; | ||
} | ||
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/*! | ||
* Debug function. Prints the contents of the open tags list. | ||
*/ | ||
static void | ||
PrintOpenTags() | ||
{ | ||
printf("\nOpen tags:\n"); | ||
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TagList *openTag = NULL; | ||
for(openTag = openTags; openTag; openTag = openTag->next) { | ||
printf("\ttag: %s\n", openTag->tag); | ||
} | ||
} | ||
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/* | ||
=================== | ||
XML | ||
=================== | ||
*/ | ||
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static int has_open_element = 0; | ||
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void | ||
XMLOpenDocument(const char *rootTag, LogOutputFp log) | ||
{ | ||
assert(log != NULL); | ||
logger = log; | ||
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logger("<?xml version=\"1.0\" encoding=\"utf-8\" ?>"); | ||
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size_t size = SDL_strlen(rootTag) + 3 + 1; /* one extra for '\0', '<' and '>' */ | ||
char *buffer = SDL_malloc(size); | ||
snprintf(buffer, size, "%s%s%s", "<", rootTag, ">"); | ||
logger(buffer); | ||
SDL_free(buffer); | ||
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// add open tag | ||
AddOpenTag(rootTag); | ||
} | ||
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void | ||
XMLCloseDocument() { | ||
// Close the open tags with proper nesting | ||
TagList *openTag = openTags; | ||
while(openTag) { | ||
TagList *temp = openTag->next; | ||
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size_t size = SDL_strlen(openTag->tag) + 4 + 1; /* one extra for '\0', '<', '/' and '>' */ | ||
char *buffer = SDL_malloc(size); | ||
snprintf(buffer, size, "%s%s%s", "</", openTag->tag, ">"); | ||
logger(buffer); | ||
SDL_free(buffer); | ||
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RemoveOpenTag(openTag->tag); | ||
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openTag = temp; | ||
} | ||
} | ||
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static const char *currentTag = NULL; | ||
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void | ||
XMLOpenElement(const char *tag) | ||
{ | ||
size_t size = SDL_strlen(tag) + 2 + 1; /* one extra for '\0', '<' */ | ||
char *buffer = SDL_malloc(size); | ||
snprintf(buffer, size, "%s%s%s", "<", tag, ">"); | ||
logger(buffer); | ||
SDL_free(buffer); | ||
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currentTag = tag; | ||
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has_open_element = 1; | ||
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AddOpenTag(tag); | ||
} | ||
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void | ||
XMLOpenElementWithAttribute(const char *tag, Attribute attribute) | ||
{ | ||
size_t size = SDL_strlen(tag) + 2 + 1; /* one extra for '\0', '<' */ | ||
char *buffer = SDL_malloc(size); | ||
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snprintf(buffer, size, "%s%s", "<", tag); | ||
logger(buffer); | ||
SDL_free(buffer); | ||
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currentTag = tag; | ||
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has_open_element = 1; | ||
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AddOpenTag(tag); | ||
} | ||
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//! \todo make this static and remove from interface? | ||
void | ||
XMLAddAttribute(const char *attribute, const char *value) | ||
{ | ||
// Requires open element | ||
if(has_open_element == 0) { | ||
return ; | ||
} | ||
size_t attributeSize = SDL_strlen(attribute); | ||
size_t valueSize = SDL_strlen(value); | ||
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size_t size = 1 + attributeSize + 3 + valueSize + 1; | ||
char *buffer = SDL_malloc(size); // 1 for '=' | ||
snprintf(buffer, size, " %s%s\"%s\"", attribute, "=", value); | ||
logger(buffer); | ||
SDL_free(buffer); | ||
} | ||
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void | ||
XMLAddContent(const char *content) | ||
{ | ||
size_t size = SDL_strlen(content) + 1 + 1; | ||
char *buffer = SDL_malloc(size); | ||
snprintf(buffer, size, "%s", content); | ||
logger(buffer); | ||
SDL_free(buffer);} | ||
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void | ||
XMLCloseElement(const char *tag) | ||
{ | ||
// 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; | ||
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size_t size = SDL_strlen(openTag->tag) + 4 + 1; /* one extra for '\0', '<', '/' and '>' */ | ||
char *buffer = SDL_malloc(size); | ||
snprintf(buffer, size, "%s%s%s", "</", openTag->tag, ">"); | ||
logger(buffer); | ||
SDL_free(buffer); | ||
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const int openTagSize = SDL_strlen(openTag->tag); | ||
const int tagSize = SDL_strlen(tag); | ||
const int compSize = (openTagSize > tagSize) ? openTagSize : tagSize; | ||
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int breakOut = 0; | ||
if(SDL_strncmp(openTag->tag, tag, compSize) == 0) { | ||
breakOut = 1; | ||
} | ||
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RemoveOpenTag(openTag->tag); | ||
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openTag = temp; | ||
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if(breakOut) { | ||
break; | ||
} | ||
} | ||
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has_open_element = 0; | ||
} |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,80 @@ | ||
/* | ||
Copyright (C) 2011 Markus Kauppila <markus.kauppila@gmail.com> | ||
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. | ||
*/ | ||
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#ifndef _XML_H | ||
#define _XML_H | ||
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#include "logger.h" | ||
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typedef struct Attribute { | ||
const char *attribute; | ||
const char *value; | ||
} Attribute; | ||
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/*! | ||
* Opens XML document. | ||
* Creates header and start tag for root element. | ||
* | ||
* \param rootTag Root tag for the XML document | ||
*/ | ||
void XMLOpenDocument(const char *rootTag, LogOutputFp log); | ||
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/*! | ||
* Closes the XML-document. | ||
* Creates end tag for root element and closes other open elements | ||
* with correct nesting. | ||
*/ | ||
void XMLCloseDocument(); | ||
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/*! | ||
* Opens XML-element. | ||
* | ||
* \param tag Element to be opened | ||
*/ | ||
void XMLOpenElement(const char *tag); | ||
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/*! | ||
* Add attribute to currently open element. | ||
* | ||
* \param attribute Name of the attribute | ||
* \param value Value of the given attribute | ||
*/ | ||
void XMLAddAttribute(const char *attribute, const char *value); | ||
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/*! | ||
* Add content to currently open element. | ||
* | ||
* \param content Content for the currently open element | ||
*/ | ||
void XMLAddContent(const char *content); | ||
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/*! | ||
* Closes previously opened element. | ||
* Enforces proper nesting by not allowing end elements haphazardly. | ||
* | ||
* Closes all the opened elements until the given element/tag is found | ||
* | ||
* \param tag Element to close | ||
*/ | ||
void XMLCloseElement(const char *tag); | ||
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#endif | ||
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