10
Consider the following simple C program that read a file into a buffer and displays that buffer to the console:
#include<stdio.h>
main()
{
FILE *file;
char *buffer;
unsigned long fileLen;
//Open file
file = fopen("HelloWorld.txt", "rb");
if (!file)
{
fprintf(stderr, "Unable to open file %s", "HelloWorld.txt");
return;
}
//Get file length
fseek(file, 0, SEEK_END);
fileLen=ftell(file);
fseek(file, 0, SEEK_SET);
//Allocate memory
buffer=(char *)malloc(fileLen+1);
if (!buffer)
{
fprintf(stderr, "Memory error!");
fclose(file);
return;
}
//Read file contents into buffer
fread(buffer, fileLen, 1, file);
//Send buffer contents to stdout
printf("%s\n",buffer);
fclose(file);
}
The file it will read simply contains:
Hello World!
The output is:
Hello World!²²²²▌▌▌▌▌▌▌↔☺
It has been a while since I did anything significant in C/C++, but normally I would assume the buffer was being allocated larger than necessary, but this does not appear to be the case.
fileLen ends up being 12, which is accurate.
I am thinking now that I must just be displaying the buffer wrong, but I am not sure what I am doing wrong.
Can anyone clue me in to what I am doing wrong?