对cgi取值的简单封装

闲来无事对cgi的操作进行了一个简单封装；
仿照php对变量的读取方法，在php中存在了全局数组$_GET[]、$_POST[]和$_REQUET[]，这里我定义了个结构体(kv)来模拟这种全局数组；主要的作用就是讲键值对进行分离而已；

cgi_decode.c

#include "cgi_decode.h"

char *Z_GET(const char *key,kv *keyValues){
    int res = 0;
    int index = 0;
    int count = keyValues -> count;
    for(index = 0; index < count; index++ ){
        res = strcmp(key,keyValues -> key[index]);
        if(res == 0){
            //查询到该key值对应的value
            return keyValues -> values[index];
        }
    }
    return NULL;
}

int get_keyValues(kv *keyValues)
{
/*******************从环境变量中取值*************************************/
    char *method = NULL;
    char *my_data = NULL;
    char *tmp_ptr = NULL;
    int data_len = 0;
    /* 窗体以GET 方式传数据*/
    method=getenv("REQUEST_METHOD");
    if( strcmp(method,"GET") == 0)
    {
        tmp_ptr=getenv("QUERY_STRING");
        data_len = strlen(tmp_ptr);
        my_data = (char *)malloc(sizeof(char)*(data_len+1));
        strcpy(my_data,getenv("QUERY_STRING"));
        my_data[data_len]='\0';
    }
    /* 窗体以POST 方法传数据*/
    if(strcmp(method,"POST") == 0)
    {
        data_len = atoi(getenv("CONTENT_LENGTH"));
        my_data = (char *) malloc(sizeof(char)*(data_len + 1));
        fread(my_data,1,data_len,stdin);
    }
/*******************根据&取得键值对*************************************/
    //char my_data[] = "name=hello&password=jiuzhou&value=12.3";
    char delims[] = "&";
    char *result = NULL;
    int len;
    len = 0;
    result = strtok(my_data,delims);
    while(result != NULL){
        /* get the key_value */
        strcpy(keyValues -> keyValues[len++],result);
        result = strtok(NULL,delims);
    }
    keyValues -> count = len;
/*******************根据=取得各个键值*************************************/
    int i = 0;
    int flag = 0;
    char *data = NULL;
    char kv[] = "=";
    char *res = NULL;
    for( i = 0; i < len; i++){
        flag = 0;
        data = keyValues -> keyValues[i];
        res = strtok(data,kv);
        while(res != NULL){
            if(flag == 0){
                strcpy(keyValues -> key[i],res);
                flag++;
            }
            else{
                strcpy(keyValues -> values[i],res);
            }
            res = strtok(NULL,kv);
        }
    }
    return len;
}

cgi_decode.h

/*********
// name : cgi_decode.h
// author : zxc
// date : 2013/4/2
**********/
#ifndef CGI_DECODE_H
#define CGI_DECODE_H

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

#define KEY_VALUE 20
#define VALUE_LENGTH 20
#define KEYVALUE_LENGTH 40
typedef struct _key_value{
    char keyValues[KEY_VALUE][KEYVALUE_LENGTH];
    char key[KEY_VALUE][VALUE_LENGTH];
    char values[KEY_VALUE][VALUE_LENGTH];
    int count;
}kv;

int get_keyValues(kv *keyValues);
char *Z_GET(const char *key,kv *keyValues);

#endif

测试：curl ''

#include "cgi_decode.h"

int main(void)
{
    printf("Content-type: text/html\n\n");
    kv my_kv;
    int count = get_keyValues(&my_kv);//从环境变量中取值保存在结构体中
    char *value = NULL;
    value = Z_GET("name",&my_kv);//根据键去查询对应的值
    if(value){
        printf("the value is : %s\n",value);
    }
    else{
        printf("no result!\n");
    }
    return 0;
}