学步园

本程序使用C语言读取类似以下格式的properties文件。

path = /etc/wgetrc

launch_on_start = true

下一版目标：

（1）使用指针代替二维数据或者二维数据的容量减少至最低要求。

（2）忽略所有空格，忽略空行及注释行

（3）头文件规范写法。

文件1：main.c

#include <stdio.h>
#include "read_properties.h"

int main(void){
    
    char names[100][100], values[100][100];

    read_properties("/home/lujinhong/scripts/projects/read_properties_file/test.properties", names, values);

    return 0;
}

文件2：read_properties.h

void read_properties(char *pathname, char names[100][100], char values[100][100]);

文件3：read_properties.c

/********************************************************************
 * This file is used to read the names and values from a properties file,
 * and store them in an array.
 *
 * ******************************************************************/

#include "read_properties.h"
#include <stdio.h>
#include <unistd.h>
#include "utils.h"

void read_properties(char *pathname, char names[100][100], char values[100][100]){

    FILE *file;
    char line[100];
    int i = 0;

    file = fopen(pathname, "r");
    while(fgets(line, 100, file)){
        printf("%s", line);                             //just for test, delete it later.
        parseline(line, names[i], values[i]);
        i++;
    }


    fclose(file);

}

文件4：utils.h

void parseline(char *line, char *name, char *value);

文件5：utils.c

/***********************************************************
 * Parse content of the line, and store the name and value. 
 * line example: path=/etc/wgetrc
 *
 * *********************************************************/
void parseline(char *line, char *name, char *value){
     
    int length = 0, equal = 1; //equal will record the location of the '='
    char *begin;

    length = strlen(line);

    for(begin = line; *begin != '=' && equal <= length; begin ++){
            equal++;
    }

    strncpy(name, line, equal - 1); 
    line+=equal;
    strncpy(value, line, length - equal);

    printf("name = %s   value = %s\n", name, value); //just for test, delete it later.

}

运行结果：

path = /etc/wgetrc
name = path     value =  /etc/wgetrc

launch_on_boot = true
name = launch_on_boot   value =  true