无法分配堆内存

Question

Background: I am trying to open a file that I altered and reserve enough heap memory for all its' contents. However, I am struggling to find a solution to the program ending before all the file's contents are read into heap memory.

Best Guess: I do not think I have reserved enough bytes in heap memory || I have cast my pointer as the wrong type (currently it is type char), which may have adversely affected the way in which and how much of my heap memory was reserved.

FILE *fptr3;

void highgest_and_lowest_Jan123(void)
{
int c;
unsigned int i = 0;
char *file;
long int size = 0;


fptr3 = fopen("/Users/sam/Desktop/Altered_AL_Weather_Station.txt", "r+");
if (fptr3 == 0)
{
    printf("There was an error creating the file.\n");
    exit(0);
}

fseek(fptr3, 0, SEEK_END);
size = ftell(fptr3);
file = (char *) malloc(size * sizeof(char));
if(!file)
{
    puts("Not enough memory");
    exit(1);
}

fseek(fptr3, 0, SEEK_SET);

do
{
    c = fgetc(fptr3);
    if ((int)c == EOF)
        break;
    file[i] = c;
    printf("%c", file[i]);
    i++;
} while((int)c != EOF);

// pus memory back on the heap
free(file);

}

Here is what my current output is:

But, here is what my output SHOULD BE:

Answer 1

EOF is expanding to a value of -1 on most systems. fgetc is returning int . But you are reading it into a char variable. Now assume that your file is containing a value of 0xFF . In this case the byte value of c would be 0xFF , which, when cast to int will become 0xFFFFFFFF , which is a representation for int -1 value. Then it is compared to EOF , and the comparison returns true, effectively stopping your loop. Solution: Declare c as int .