addcr.c

换行符转换

#include<stdlib.h>
#include<stdio.h>
#define SYM_LF	'\n'
#define SYM_CR	'\r'
#define NOCR	0
#define LINUX_T	1
#define WIN_T	2
/*chain node data struct
 * struct chain_node
{
char num;
char str[20];
struct chain_node *pre;
};
*/
main()
{
FILE *fp=fopen("./itsme","r");
fseek(fp,0,SEEK_END);
char nlstr=0;
//the length of file,long type varient file length less than 4G
long length=ftell(fp);
fseek(fp,0,SEEK_SET);
char *swap1=malloc(length);
fread(swap1,1,length,fp);
long i,j;
long CR_cnt;
char t_flag;
CR_cnt=0;t_flag=NOCR;
//count the number of CR symbol in the text stream
//judge the type of text at the same time
for(i=0;i<=length;i++)
{
if(swap1[i]==SYM_LF)
	{CR_cnt++;
	if(t_flag!=LINUX_T)	
		{t_flag=LINUX_T;
		if((i>0)&&(swap1[i-1]==SYM_CR))	t_flag=WIN_T;
		}
	}
}
if(t_flag==NOCR) puts("There is only 1 line in the text!");
if(t_flag==LINUX_T) puts("This is a Linux type text(LF for newline)!");
if(t_flag==WIN_T)	puts("This is a Windows type text(CR+LF for newline)!");
//now we learn the length of new stream
char *swap2=malloc(length+CR_cnt);
j=0;
for(i=0;i<=length;i++)
{
if(swap1[i]==SYM_LF) {swap2[j]=SYM_CR;j++;}
swap2[j]=swap1[i];j++;
}
swap2[j]=EOF;
FILE *fp_1=fopen("./new","w");
fwrite(swap2,1,j-1,fp_1);

/*
while(!feof(fp))
{
fread(&nlstr,1,1,fp);
if(nlstr=='\n')  	
}*/
}