p6.4.c

linux编程源代码,其中是由大量的实例

#include <stdio.h>
#include <termios.h>
#include <unistd.h>
#include <errno.h>

#define ECHOFLAGS (ECHO | ECHOE | ECHOK | ECHONL)

int set_disp_mode(int fd,int option)
{
   int err;
   struct termios term;

   if(tcgetattr(fd,&term)==-1){
   	perror("Cannot get the attribution of the terminal");
	return 1;
   }

   if(option)
	   term.c_lflag|=ECHOFLAGS;
   else
	   term.c_lflag &=~ECHOFLAGS;

   err=tcsetattr(fd,TCSAFLUSH,&term);
   if(err==-1 && err==EINTR){
	   perror("Cannot set the attribution of the terminal");
	   return 1;
   }

   return 0;
}
 
int getpasswd(char* passwd, int size)
{
   int c;
   int n = 0;
   
   printf("Please Input password:");
   
   do{
      c=getchar();

      if (c != '\n'|c!='\r'){
         passwd[n++] = c;
      }
   }while(c != '\n' && c !='\r' && n < (size - 1));

   passwd[n] = '\0';
 
   return n;
}
 
int main()
{
   char passwd[20];
   
   set_disp_mode(STDIN_FILENO,0);
   getpasswd(passwd, sizeof(passwd));
   
   printf("\nYour passwd is:%s\n", passwd);
   printf("Press any key continue ...\n");
  
   set_disp_mode(STDIN_FILENO,1);
   getchar(); 
   return 0;
}