Create loginpage.c

basic_programs/loginpage.c

@@ -0,0 +1,90 @@
+#include <stdio.h>
+#include <termios.h> // in gcc, use < conio.h > in turboc
+#include <string.h>
+
+#define USERNAME    "user001"
+#define PASSWORD    "ok@123"
+
+/************************************************
+THIS CODE IS USED IN GCC LINUX
+because getch() is not defined in library file
+************************************************/
+
+static struct termios old, new;
+
+/* Initialize new terminal i/o settings */
+void initTermios(int echo)
+{
+  tcgetattr(0, &old); /* grab old terminal i/o settings */
+  new = old; /* make new settings same as old settings */
+  new.c_lflag &= ~ICANON; /* disable buffered i/o */
+  new.c_lflag &= echo ? ECHO : ~ECHO; /* set echo mode */
+  tcsetattr(0, TCSANOW, &new); /* use these new terminal i/o settings now */
+}
+
+/* Restore old terminal i/o settings */
+void resetTermios(void)
+{
+  tcsetattr(0, TCSANOW, &old);
+}
+
+/* Read 1 character - echo defines echo mode */
+char getch_(int echo)
+{
+  char ch;
+  initTermios(echo);
+  ch = getchar();
+  resetTermios();
+  return ch;
+}
+
+/* Read 1 character without echo */
+char getch(void)
+{
+  return getch_(0);
+}
+
+/* Read 1 character with echo */
+char getche(void)
+{
+  return getch_(1);
+}
+
+/* function :   getPassword(),
+   to get password from keyboard    */
+
+void getPassword(char *pass)
+{
+    int c=0;
+    char buff[30]={0},ch;
+    int len=0;
+    while((ch=getch())!='\n')
+    {
+        if(ch==0x7f)    // use 0x08 in turboc (WINDOWS)
+        {
+            if(len==0)  continue;
+            printf("\b \b"); len--; continue;
+        }
+        printf("%c",'*');
+        pass[len]=ch;
+        len++;
+    }
+    pass[len]='\0';
+
+}
+
+int main()
+{
+
+    char user[30],pass[30];
+    printf("Enter User Name :");
+    gets(user);
+    printf("Enter Password  :");
+    getPassword(pass);
+
+    if(strcmp(user,USERNAME)==0 && strcmp(pass,PASSWORD)==0)
+        printf("\nLOGIN SUCCESS.\n");
+    else
+        printf("\nLOGIN FAILED.\n");
+    return 0;
+}