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 31 32 33 34 35 36 37 38 39 40 41 42 43 | #include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>
// okay to adapt/copy
void _create_text_file(const char* filename, const char* contents) {
// create the file, opening in write mode
FILE* file = fopen(filename, "w");
// write contents
fputs(contents, file);
// close file
fclose(file);
}
int main(int argc, char* argv[]) {
const char* filename = __FILE__ ".txt";
_create_text_file(filename, "ABCDEFGHIJ");
FILE* file = fopen(filename, "r");
for (
// declare loop variable, initialize to fgetc
unsigned char ch = fgetc(file);
// am I at the end of the file
!feof(file);
// increment loop - same code as initialize
ch = fgetc(file)
) {
long position_in_file = ftell(file);
position_in_file = ftell(file);
printf("Got 0x%x ('%c'), next position is %ld\n",
ch, ch, position_in_file);
}
// do not write characters in read mode, does not work
// fputc('D', file);
fclose(file);
return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */
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