C语言解析http协议

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C语言解析http协议

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C语言解析http协议 1 关键解析函数1.1 strstr（）1.2 strncmp() 2 代码

1 关键解析函数 1.1 strstr（）

函数原型：

extern char *strstr(char *str1, const char *str2);

str1: 被查找目标　 str2: 要查找对象　返回值：若str2是str1的子串，则返回str2在str1的首次出现的地址；如果str2不是str1的子串，则返回NULL。

例子：

char str[]="1234xyz"; char *str1=strstr(str,"34"); // cout printf("str1 小于 str2"); } else if(ret > 0) { printf("str2 小于 str1"); } else { printf("str1 等于 str2"); } return(0); } 2 代码 #include #include #include #include #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) { 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. . .

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C语言解析http协议

C语言解析http协议

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