c中从stdin输入的多行字符串

Question

我尝试在我的C程序多行输入表单stdin中使用带有此代码的换行符

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <limits.h>
#include <math.h>

#define DEFAULT_INPUT_LENGTH 20

char * readMessage(FILE* file);
void writeChar(char* string, char c);


int main()
{
    printf("Message:\n");
    char * msg = readMessage(stdin);

    printf("Input: %s\n", msg);


    free(msg);


    return 0;
};

char * readMessage(FILE* file)
{
    char *input = malloc(DEFAULT_INPUT_LENGTH);

    int inputCounter = 0;
    int n = 1;
    char c;

    while(!feof(stdin))
    {
        c=fgetc(file);

        inputCounter++;

        if (inputCounter == DEFAULT_INPUT_LENGTH * n)
        {
            n++;
            int chars = DEFAULT_INPUT_LENGTH * n;

            input = realloc(input, chars);
        }

        writeChar(input, c);
    }

    return input;
}




void writeChar(char* in, char c)
{
    int i;

    for(i = 0; ; i++)
    {
        if (in[i] == '\0')
        {
            in[i] = c;
            break;
        }
    }

}

但是当我在Linux上尝试CTRL + D或在Windows中尝试CTRL + Z时输入没有结束。

输入示例如下：

asfer
dfdfd
sffdfl

在这个例子中如果我在最后一个char之后尝试CTRl + D输入未结束我必须使用enter和CTRL + D

在最后一行的换行符后提示CTRL + Z和ENTER和

Answer 1

试试这个

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

#define DEFAULT_INPUT_LENGTH 20

char * readMessage(FILE* file);
void writeChar(char* string, char c);

int main(void){
    printf("Message:\n");
    char * msg = readMessage(stdin);

    printf("Input: %s\n", msg);

    free(msg);

    return 0;
}

char * readMessage(FILE* file){
    char *input = malloc(DEFAULT_INPUT_LENGTH);

    int inputCounter = 0;
    int n = 1;
    int c;//!

    *input = 0;//!

    while((c=fgetc(file)) != EOF){//!
        inputCounter++;

        if (inputCounter == DEFAULT_INPUT_LENGTH * n){
            n++;
            int chars = DEFAULT_INPUT_LENGTH * n;

            input = realloc(input, chars);
        }

        writeChar(input, c);
    }

    return input;
}

void writeChar(char* in, char c){
    int i;

    for(i = 0; ; i++){
        if (in[i] == '\0'){
            in[i] = c;
            in[i+1] = 0;//!
            break;
        }
    }

}