test14_3.txt

人民邮电出版社的经典著作《Linux下的C编程》配套源码！初学者的必备！共14章

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define DATASIZE	 10

typedef struct TAG_mydata{
		char thestring[DATASIZE];
		int iscontinuing;
		struct TAG_mydata *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){
			fprintf(stderr, "Couldn’t allocate memory,terminating\n");
			exit(255);
		}
		if(cur){
			cur->next=new;
		}
		else{
			start=new;
		}
		cur=new;
		strcpy(cur->thestring,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->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);
		cur=next;
	}
}