test8_6.txt

Linux下的C语言编程

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define DATASIZE 10

typedef struct stringdata
{
    	char *string;
    	int iscontinuing;
    	struct stringdata *next;
} mydata;

mydata *append(mydata *start, char *input);
void displaydata(mydata *start);
void freedata(mydata *start);

int main(void)
{
    	char input[DATASIZE];
    	mydata *start=NULL;

    	printf("ENTER SOME DATA,AND PRESS Ctrl+D WHEN DONE. \n");

    	while(fgets(input, sizeof(input), stdin))
    	{
        	start=append(start, input);
    	}

    	displaydata(start);
    	freedata(start);
    	return 0;
}

mydata *append(mydata *start, char *input)
{
   	mydata *cur=start, *prev=NULL, *new;

    	while(cur)
    	{
        	prev=cur;
        	cur=cur->next;
    	}
    	cur=prev;

    	new=malloc(sizeof(mydata));
    	if(!new)
    	{
        	printf("COULDN’T ALLOCATE MEMORY! \n");
        	exit(255);
    	}
    
    	if(cur)
        	cur->next=new;
    	else
        	start=new;
    
    	cur=new;

	if(!(cur->string=malloc(sizeof(input)+1)))
	{
    		printf("ERROR ALLOCATING MEMORY! \n");
    		exit(255);
	}
	strcpy(cur->string, input);
	cur->iscontinuing=!(input[strlen(input)-1]=='\n'||input[strlen(input)-1]=='\r');
	cur->next=NULL;

	return start;
}


void displaydata(mydata *start)
{
    	mydata *cur;
	int linecounter=0, structcounter=0;
	int newline=1;

	cur=start;
	while(cur)
	{
    		if(newline)
        		printf("LINE %d:",++linecounter);
    		structcounter++;
    		printf("%s",cur->string);
    		newline=!cur->iscontinuing;
    		cur=cur->next;
	}
	printf("THIS DATA CONTAINED %d LINES AND WAS STORED IN %d STRUCTS. \n",
	linecounter,structcounter);
}


void freedata(mydata *start)
{
    	mydata *cur, *next=NULL;

    	cur=start;
    	while(cur)
    	{
        	next=cur->next;
       		free(cur->string);
        	free(cur);
        	cur=next;
    	}
}