Linux C 编程一站式学习 第25章 C标准库 综合练习二题解 文件格式转换

/**************************************************

test.ini file is:

;Configuration of http

[http]

domain=www.mysite.com

port=8080

cgihome=/cgi-bin

;Configuration of db

[database]

server = mysql

user = myname

password = toopendatabase

After conveter test.xml file is:

<!-- 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>

***************************************************/

#include <stdio.h>

#include <unistd.h>

#include <stdlib.h>

#include <string.h>

int isEmptyLine(char *str);

char* delStartLastSpace(char *str);

void change_Ini2Xml(char *srcfile, char *destfile)

{

FILE *srcfp = NULL;

FILE *destfp = NULL;

char buf[81];

char *str = NULL;

char *head = NULL;

char headbuf[80];

int condition = 1;

int index = 0;

int ch = 0;

srcfp = fopen(srcfile, "r");

if (srcfp == NULL)

{

printf("Open the source file error!\n");

exit(1);

}

destfp = fopen(destfile, "w");

if (destfp == NULL)

{

printf("Open the destination file error!\n");

exit(1);

}

while (condition)

{

ch = fgetc(srcfp);

if (EOF == ch) /* if read the end of the file set condition to 0 */

{

condition = 0;

}

buf[index++] = ch;

if (('\n' == ch) || ('\0' == ch) || (EOF == ch)) /* have read a line */

{

buf[--index] = '\0';

index = 0;

if (isEmptyLine(buf)) /* check whither the line is empty? */

{

if (head != NULL)

{

fprintf(destfp, "</%s>\n", head);

head = NULL;

}

fprintf(destfp, "\n");

}

else

{

switch (buf[0])

{

case ';':

str = strtok(buf, ";");

fprintf(destfp, "<!-- %s-->\n", str);/* string has a 回车 at last */

break;

case '[':

str = strtok(buf + 1, "]");

strcpy(headbuf, str);

head = headbuf;

fprintf(destfp, "<%s>\n", str);

break;

default:

str = strtok(buf, "="); /* get the section name */

str = delStartLastSpace(str); /* delete the start and end space of the string */

fprintf(destfp, "\t\t<%s>", str);

str = strtok(NULL, "=");

str = delStartLastSpace(str);

while (*str != '\0') /* the last line of file end with '\0' */

{

/* the line isn't the last line of the file end with 回车,it's asscii code is 0x0D */

if (*str != 0x0D) /* if the char is not 回车，write to destfp */

{

fputc(*str, destfp);

}

str++;

}

str = strtok(buf, "=");

str = delStartLastSpace(str);

fprintf(destfp, "</%s>\n", str);

break;

}

}

}

}

printf("%s--->%s\nThe convert success!\n", srcfile, destfile);

if (head != NULL)

{

fprintf(destfp, "</%s>\n", head);/* write the end of the section name */

}

fclose(srcfp);

fclose(destfp);

}

/*******************************************************

return 0: the string is not empty.

return 1: the string is empty.

empty string is contain zero or many space characters

and tab characters.

note:

the line isn't the last line of the file end with 回车,

it's asscii code is 0x0D.

********************************************************/

int isEmptyLine(char *str)

{

while (*str != '\0')

{

//printf("%c %x\n", *str, *str);

if ((*str != ' ') && (*str != '\t') && (*str != 0x0D) && (*str != '\n'))

{

return 0;

}

str++;

}

return 1;

}

char* delStartLastSpace(char *str)

{

char *temp = NULL;

int len = 0, i = 0;

temp = str;

while (temp[i] != '\0')

{

if ((' ' == temp[i]) || ('\t' == temp[i])) /* delelte the start space */

{

i++;

}

else

{

temp[len++] = temp[i++];

}

}

--len;

while ((' ' == str[len]) || ('\t' == str[len]) )/* delelte the last space */

{

--len;

}

str[++len] = '\0';

return str;

}

int main(void)

{

change_Ini2Xml("test.ini", "test.xml");

return 0;

}