linux下fgets(..,..,stdin)不阻塞？？
我编写了一个修改文档的程序，但是不知道为什么用fgets(buf,1024,stdin)的时候就不阻塞，我是分为两个函数写的，两个函数分别工作的时候就正常，两个函数合起来工作的时候就会这样，求救！！
函数如下：
find函数寻找对应项，modify函数修改对应项。
#include   <stdio.h>
extern   int   modify(FILE   *fp);
int   main()
{
FILE   *fp;
if(fp=fopen( "./t.txt ", "r+ ")==NULL)
{
printf( "there   is   no   such   file ");
return   -1;
}
find(fp);
modify(fp);
fclose(fp);
return   0;
}

int   find(FILE   *fp)
{
char   *t;
char   *idata;
char   *namebuf,*buf2,*addr,*tempbuf;
char   *searchname;
char   *tsearchname,*tnamebuf;
long   count;
long   offsize;
offsize=0;
fseek(fp,0,SEEK_SET);
searchname=(unsigned   char   *)malloc(1024);
idata=(unsigned   char   *)malloc(1024);


tsearchname=(unsigned   char   *)malloc(1024);
tsearchname=searchname;
while((*searchname=(unsigned   char)fgetc(stdin))!= ': ')
{
searchname++;
}


namebuf=(unsigned   char   *)malloc(1024);
tempbuf=(unsigned   char   *)malloc(1024);
tnamebuf=(unsigned   char   *)malloc(1024);
namebuf=tnamebuf;
while((t=fgets(tempbuf,1024,fp))!=NULL)
{

fseek(fp,offsize,SEEK_SET);

while((*tnamebuf=(unsigned   char)fgetc(fp))!= ': ')
{
tnamebuf++;
printf( "the   number   is:%s\n ",namebuf);
}

printf( "namebuf:%s\nsearchname:%s\n ",namebuf,tsearchname);
int   a=0;

if((a=strcmp(namebuf,tsearchname))==0)
break;

printf( "strcmp   is:%d\n ",a);

tnamebuf=namebuf;
fgets(tempbuf,1024,fp);
offsize=ftell(fp);
printf( "%s\n ",tempbuf);
}
if(t==NULL)
{
printf( "can 't   find   the   number\n ");
return   1;
}
else
{

printf( "the   number   %s   is   found\n ",namebuf);
printf( "end   here\n ");
}
printf( "enter   your   data   **:**\n ");

printf( "yeye\n ");
return   0;
}

int   modify(FILE   *fp)
{
char   *pointbuftemp;
char   *buf,*buf2,*buftemp;
int   rest;
long   current,next,nextnext,departure;
buf=(unsigned   char   *)malloc(1024);
buftemp=(unsigned   char   *)malloc(1024);
buf2=buf;
current=ftell(fp);
rest=1024;
fgets(buf,rest,fp);
next=ftell(fp);
departure=0;
while(fgets(buf,rest,fp)!=NULL)
{
nextnext=ftell(fp);
departure=nextnext-next;
next=ftell(fp);
rest-=departure;
buf+=departure;
}
fseek(fp,current,SEEK_SET);
fgets(buftemp,1024,stdin);
fputs(buftemp,fp);
fputs(buf2,fp);
printf( "fflush?\n ");
return   0;
}
请问这是什么原因，应该怎么办呢？谢谢！！


------解决方案--------------------
设这样的
*searchname=(unsigned char)fgetc(stdin)!= ': '

读完以后,缓冲区里的\n号没读取出来.在modify内再用fgets(buftmp,1024,stdin)读时就会把这个 '\n '读走.

这样改一下就可以了:
while((*searchname=(unsigned char)fgetc(stdin))!= ': ')
{