HTTP协议URL解析的C语言实现

/**

 * 日期：2017年12月21日

 * 作者：jack

 * 原因：没有看到合适的解析URL代码，自己写一个。

 * 应用：WIFI模块的Webserver

 * 心情：可能不做嵌入式开发了，转向Java 的Hadoop

 * 特点：不依赖很多东西，小巧稳定

 */

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

#define METHOD_DECODE(mode) mode?"POST":"GET"

static char data[] =
"GET /joyent/http-parser.txt HTTP/1.1\r\n"
"Host: github.com\r\n"
"DNT: 1\r\n"
"Accept-Encoding: gzip, deflate, sdch\r\n"
"Accept-Language: ru-RU,ru;q=0.8,en-US;q=0.6,en;q=0.4\r\n"
"User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_1) "
"AppleWebKit/537.36 (KHTML, like Gecko) "
"Chrome/39.0.2171.65 Safari/537.36\r\n"
"Accept: text/html,application/xhtml+xml,application/xml;q=0.9,"
"image/webp,*/*;q=0.8\r\n"
"Connection: keep-alive\r\n"
"Transfer-Encoding: chunked\r\n"
"Cache-Control: max-age=0\r\n\r\nb\r\nhello world\r\n0\r\n\r\n";

struct http_parser_urt
{
char filename[32];
char method; /* 0:GET;1:POST */
};

char parse_url(struct http_parser_urt * httpurl, char * strurl)
{
char ret = 0;
char * line_start = NULL;
char * line_end = NULL;
char * start_temp = NULL;
char * end_temp = NULL;
char * line_temp = NULL;

/* input check */
if( (httpurl == NULL)||(strurl == NULL) )
{
ret = 1;
return ret;
}

/* check http end flag */
line_temp = (char *)strstr(strurl, "\r\n\r\n");
if (line_temp == NULL)
{
ret = 1;
return ret;
}

/* ----------------------------------- first line ------------------------------*/
/* Determine the first and end addresses of a line */
line_start = strurl;
line_end = (char *)strstr(line_start, "\r\n");
if (line_end == NULL)
{
ret = 1;
return ret;
}

/* find method name */
if (strncmp(line_start, "GET ", 4) == 0)
{
httpurl->method = 0;
start_temp = line_start + 4;
}
else if (strncmp(strurl, "POST ", 5) == 0)
{
httpurl->method = 1;
start_temp = line_start + 5;
}
else
{
/* now do not suport method */
}

/* find file name */
start_temp++;
end_temp = (char *)strstr(line_start, " HTTP");
strncpy_s(httpurl->filename, start_temp, end_temp-start_temp);

return ret;
}

int main(int argc, char * argv[])
{
char ret1 = 0;
struct http_parser_urt url_test1;
ret1 = parse_url(&url_test1, data);
if (ret1 != 0)
{
4000
printf("解析失败...\r\n");
return 0;
}
printf("解析成功..\r\n");
printf("方法名为:%s\r\n", METHOD_DECODE(url_test1.method));
printf("文件名为:%s\r\n", url_test1.filename);
system("pause");
}

运行结果：
解析成功..

方法名为:GET

文件名为:joyent/http-parser.txt

请按任意键继续. . .