学步园

// config.h

struct conf_info
{
    const char
*name;
    void *object;
};

extern void parse(FILE*);


// config.c

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

#include <ctype.h>
#include
"config.h"

void trim(char*s)
{
    char *c
= s + strlen(s)- 1;
    while (isspace(*c)&&
c > s)
{
        *c =
'\0';
        --c;
    }

    if(c == s)     //此处

        *c = '\0';
}

static void apply_command(Cconf_info* p,
char *args)
{
    if (p->object){
            if (*(char**)
p->object!=
NULL)
                free(*(char**)
p->object);
            *(char**) p->object=
strdup(args);
        }
}
/* parse configure file */
void parse(FILE* fp)
{
    Cconf_info *p;
    char buf[1024],*c;
    int line
= 0;
    while (fgets(buf, 1024, fp)!=
NULL)
    {
        ++line;
        if (buf[0]==
'\0' || buf[0]==
'#' || buf[0]==
'\n')

        {

           memset(buf, 0, 1024);
            continue;
        }

        trim(buf);
        if (buf[0]==
'\0')
            continue;
        c = buf;
        while (!isspace(*c))
            ++c;
        if (*c==
'\0')
{
           c = NULL;
        }
        else {
            *c ='\0';
            ++c;
        }
        p = lookup_keyword(buf);

        if(p != NULL)
             apply_command(p, c);

        memset(buf, 0, 1024);
    }
}


//main.c

#include<stdio.h>
#include
<stdlib.h>
#include
"config.h"
extern char
*server_root;
extern char
*db_addr;
extern char
*db_user;
extern char
*db_passwd;
int main(void)
{
    FILE *fp;
    if ((fp=
fopen("test.conf","r"))==
NULL)
    {
        fprintf(stderr,"Can't open conf file %s .\n","test.conf");
        exit(1);
    }
    parse(fp);
    printf("ServerRoot is : %s\n", server_root);
    printf("DataBase address is : %s\n", db_addr);
    printf("DataBase user is : %s\n", db_user);
    printf("DataBase user password is : %s\n", db_passwd);
    return 0;
}

此是Makefie文件：

LIBS= -lm
CFLAGS= -Wall -O2 -g

OBJS= main.o config.o

config: $(OBJS)
       gcc -o $@ $(OBJS) $(LIBS)

clean:
       rm -f config $(OBJS)

下面是test.conf配置文件：

#######配置文件test.conf######
#

serverName 10.10.206.30
dbAddr 10.10.206.32
dbUser root
dbPasswd 123456
####
##

值得注意的是：

1、windows下的回车/换行，\r\n 两个分开的，在Linux下，\n作用可以等同于\r\n,

2、windows下Enter键 是\r\n  而Linux下Enter键 是\n