Question

when I read from stdin like this:

size_t bufSize = 1024;
unsigned char inputBuffer[bufSize];
size_t readNum = 0;
readNum = fread(inputBuffer, sizeof(unsigned char) * bufSize, 1, stdin);

in the readNum are stored number of object, this mean when I read from stdin 1024 bytes, the readNum has value 1. But when I read from stdin < 1024 bytes, than readNum has value 0. Question is, how can I recognize how many bytes was read from stdin when the number is less then 1024?

Answer 1

Use readNum = fread(inputBuffer, sizeof(unsigned char), bufSize, stdin);

You’re trying to read bufSize elements, each with a size sizeof(char) – not one element with a size of bufSize * sizeof(char) – so your fread call should reflect that.