用有限状态机实现INI和XML的转换

　　写了个INI转化为XML的小程序，利用有限状态机实现的。很简单，把INI文件中的内容一行一行地读取进一个buffer里面，然后对这个buffer进行解析，最后转化为XML的格式再写进XML文件里面。

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define BUFFER_SIZE    512
#define TRUE  1
#define FALSE 0

typedef enum _state
{
    STATE_NONE = 0,
    STATE_COMMENT,
    STATE_SECTION,
    STATE_SECTION_END,
    STATE_KEY,
} stateType;

char gSection[BUFFER_SIZE];

static int gSectionIsEmpty(void)
{
    for (int index = 0; index < BUFFER_SIZE; ++index)
    {
        if (gSection[index] != 0x00)
        {
            return FALSE;
        }
    }
    return TRUE;
}

static stateType getStateType(const char ch)
{
    stateType state = STATE_NONE;
    if (ch == ';')
        state = STATE_COMMENT;
    else if (ch == '[')
        state = STATE_SECTION;
    else if (ch == '\0' || ch == '\n' || ch == ' ' || ch == '\t')
        state = STATE_SECTION_END;
    else
        state = STATE_KEY;
    return state;
}

#define KEY_LEN   128
#define VALUE_LEN 256
static void parse_key_and_value(const char *line, char *buffer)
{
    char key[KEY_LEN] = {0};
    char value[VALUE_LEN] = {0};

    for (int index = 0; *line != '\0'; ++line)
    {
        if (*line != '\t' && *line != ' ' && *line != '=')
        {
            key[index++] = *line;
        }
        else
        {
            key[index] = '\0';
            break;
        }
    }
    for (; *line != '\0'; ++line)
    {
        if (*line == '\t' || *line == ' ' || *line == '=')
            continue;
        else
            break;
    }
    for (int index = 0; *line != '\0'; ++line)
    {
        if (*line != '\t' && *line != ' ' && *line != '=')
        {
            value[index++] = *line;
        }
        else
        {
            value[index] = '\0';
            break;
        }
    }

    sprintf(buffer, "\t<%s>%s</%s>\n", key, value, key);
    return;
}

static void iniParse(const char *line, FILE *fpXML)
{
    char writeBuffer[BUFFER_SIZE] = {0};
    stateType state = getStateType(*line);

    switch (state) 
    {
        case STATE_COMMENT:
            line++;
            sprintf(writeBuffer, "<!-- %s -->\n", line);
            fwrite(writeBuffer, strlen(writeBuffer), 1, fpXML);
            break;

        case STATE_SECTION:
            line++;
            for (int index = 0; index < BUFFER_SIZE && *line != '\0'; ++line)
            {
                if (*line != ']')
                {
                    gSection[index++] = *line;
                }
                else
                {
                    gSection[index] = '\0';
                    sprintf(writeBuffer, "<%s>\n", gSection);
                    fwrite(writeBuffer, strlen(writeBuffer), 1, fpXML);
                }
            }
            break;
            
        case STATE_SECTION_END:
            if (gSectionIsEmpty() == FALSE)
            {
                sprintf(writeBuffer, "</%s>\n\n", gSection);            
                fwrite(writeBuffer, strlen(writeBuffer), 1, fpXML);
                memset(gSection, 0x00, sizeof(gSection));
            }
            break;

        case STATE_KEY:
            parse_key_and_value(line, writeBuffer);
            fwrite(writeBuffer, strlen(writeBuffer), 1, fpXML);
            break;

        default:
            break;
    }
    return;
}

static void createXML(const char *iniName, char *xml)
{
    for (int index = 0; index < 20; ++index)
    {
        if (iniName[index] != '.' && iniName[index] != '\0')
        {
            xml[index] = iniName[index];
        }
        else 
        {
            strcat(xml, ".xml");
            break;
        }
    }
    return;
}

static void writeTheLastSectionEnd(FILE *fpXML)
{
    char writeBuffer[BUFFER_SIZE] = {0};
    sprintf(writeBuffer, "</%s>\n\n", gSection);            
    fwrite(writeBuffer, strlen(writeBuffer), 1, fpXML);
    return;
}

static void iniToxml(const char *iniName)
{
    char xmlName[20] = {0};
    createXML(iniName, xmlName);

    FILE *fpINI = fopen(iniName, "r");
    FILE *fpXML = fopen(xmlName, "a+");
    if (fpINI == NULL || fpXML == NULL)
    {
        fprintf(stderr, "open ini/xml file failed.\n");
        return;
    }

    char line[BUFFER_SIZE] = {0};
    while (fgets(line, BUFFER_SIZE, fpINI))
    {
        line[strlen(line) - 1] = '\0';
        iniParse(line, fpXML);
        memset(line, 0x00, sizeof(line) );
    }
    writeTheLastSectionEnd(fpXML);        

    fclose(fpINI);
    fclose(fpXML);
    return;
}

int main(int argc, char *argv[])
{
    if (argc < 2)
    {
        fprintf(stdout, "usage: ./iniToxml <*.ini> (<*.ini>, ...)");
        return -1;
    }

    for (int i = 1; i < argc; ++i)
    {
        iniToxml(argv[i]);
    }
    return 0;
}

测试的一个INI文件为：

;Configuration of http
[http]
domain=www.mysite.com
port=8080
cgihome=/cgi-bin

;Configuration of db
[database]
server = mysql
user = myname
password = toopendatabase

转化后的XML文件为：

<!-- Configuration of http -->
<http>
    <domain>www.mysite.com</domain>
    <port>8080</port>
    <cgihome>/cgi-bin</cgihome>
</http>

<!-- Configuration of db -->
<database>
    <server>mysql</server>
    <user>myname</user>
    <password>toopendatabase</password>
</database>

 

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