1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | #include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>
#include <stdint.h> // for uint64_t (type that is unsigned int, guaranteed to be 64-bits)
// Okay to copy/adapt this code if you understand it. Correctness if your responsibility.
typedef unsigned char uchar;
void cat_file(char const* filename) {
FILE* stream = fopen(filename, "r"); // mode is "r" (read), "w" (write), "a" (append)
for(char ch = fgetc(stream); !feof(stream); ch = fgetc(stream)) {
fputc(ch, stdout);
}
fclose(stream); // ALWAYS call fclose(…) once for every time you call fopen(…).
// When reading a file, after you have read the last character in the file, the next
// time you call fgetc(…), it will return a special value, called EOF (== -1). Once
// that has happened, calling feof(…) will return true. These semantics are delicate.
//
// Do not use EOF in your code.
// If you go online, you will see people use while loops and EOF. Don't follow that.
}
int main(int argc, char* argv[]) {
cat_file("animal.txt");
return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */
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