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#include <assert.h>

#include <limits.h>

#include <math.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include <iostream>

using namespace std;

int myRead(const char* f, const int size) {

FILE* fp;

char buf[size];

memset(buf, 0, size);

int res = 0;

fp = fopen(f, "r");

if(fp == nullptr) {

perror("Error opening file");

return -1;

}

/* char *fgets(char *s, int size, FILE *stream);

每次读取size - 1大小的字节数据，然后加上'\0'来结尾！！！ 比如： size = 5, 读取 1234 + '\0'

直到遇到文件结尾符号，返回NULL

*/

char* s;

while((s = fgets(buf, size, fp)) != nullptr) {

cout << s << " : ";

cout << buf << endl;

cout << strlen(buf) << endl;

cout << strlen(s) << endl;

res += strlen(buf);

}

return res;

}

int main(void) {

std::cout << myRead("test.tmp", 5) << std::endl;

return 0;

}

/*

test.tmp:

1234567890

输出：

1234

5678

90

*/