initial commit

vansh/Auth/main.c

@@ -0,0 +1,86 @@
+#include<stdio.h>
+#include<stdlib.h>
+#include <string.h>
+#include<mysql.h>
+#include "auth.h"
+
+void
+error_found(MYSQL *con){
+	printf("%s\n",mysql_error(con));
+	mysql_close(con);
+}
+
+int main(int argv , char **argc){
+	//Pass the Teacher latitude and longitude from command line argument.
+   	//Teacher latitude and longitude...
+  	ld teach_lat = strtold(argc[1],NULL) , teach_long = strtold(argc[2],NULL);
+	
+	MYSQL *con = mysql_init(NULL);
+
+
+	if( con == NULL ){
+		printf("mysql_init() failed\n");
+		return 0;
+    	}
+	
+	if( mysql_real_connect(con,"localhost","root","4r57ZeBEzR5b"
+			,"bpitattendance", 0,NULL,0) == NULL ){
+		error_found(con);
+	}
+
+	if( mysql_query(con, "SELECT * FROM attendance") ){
+		error_found(con);
+	}
+
+	MYSQL_RES *result = mysql_store_result(con);
+
+	if( result == NULL ){
+		error_found(con);
+	}
+
+	int num_fields = mysql_num_fields(result);
+
+	MYSQL_ROW row;
+	
+	int enroll = 0;
+	long double stu_lat = 0 , stu_long = 0;
+	long double dist = 0;
+	char en_num[15];
+	char query[150]="";
+
+	while( (row = mysql_fetch_row(result) ) ){
+		
+		enroll = (int)strtoll(row[0],NULL,10);
+		stu_lat = strtold(row[1],NULL);
+		stu_long = strtold(row[2],NULL);
+		
+		strcpy(query,"");
+		sprintf(en_num,"%d",enroll);
+		dist = orthodromic_distance(stu_lat,stu_long,teach_lat,teach_long);
+		if( check_range(dist) ){
+			strcat(query,"UPDATE attendance SET is_present = true WHERE enroll_num =");
+			strcat(query,en_num);
+			strcat(query,";");
+			if( mysql_query(con, query ) ){
+				error_found(con);
+			}
+			printf("%ld is present\n",enroll);
+		}
+		else{
+			strcat(query,"UPDATE attendance SET is_present = false WHERE enroll_num =");
+			strcat(query,en_num);
+			strcat(query,";");
+			if( mysql_query(con,query ) ){
+				error_found(con);
+			}
+			printf("%ld is absent\n",enroll);
+		}
+
+	}
+
+	mysql_free_result(result);
+	mysql_close(con);
+
+
+    	return 0;
+}