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cp5-11-2.c
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cp5-11-2.c
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#include<stido.h>
#include<stdlib.h>
#define MAXLINE 1000
#define YES 1
#define NO 0
#define TABSIZE 8
void settab(int argc,char *argv[],char *tab);
void detab(char *tab);
int tabpos(int pos ,char *tab);
int main(int argc,char *argv[])
{
char tab[MAXLINE+1];
settab(argc,argv,tab);
detab(tab);
return 0;
}
void detab(char *tab)
{
int c,pos=1;
while((c=getchar())!=EOF)
if(c=='\t')
{
do
putchar(' ');
while(tabpos(pos++,tab)!=YES)/*打印空格直到tab结束位*/
}
else if(c=='\n')
{
putchar(c);
pos=1;
}
else
{
putchar(c);
pos++;
}
}
void settab(int argc,char *argv[],char *tab)
{
int i,pos;
if(argc<=1)
for(i=0;i<MAXLINE;i++)
if(i%TABSIZE==0)
tab[i]=YES;
else
tab[i]=NO;
else
{
for(i=0;i<MAXLINE;i++)
tab[i]=NO;
while(--argc>0)
{
pos=atoi(*++argv);
if(pos>1&&pos<MAXLINE)
tab[pos]=YES;
}
}
}
int tabpos(int pos,char *tab)
{
if(pos>MAXLINE)
return YES;
else
return tab[pos];
}