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 | #include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
// ERROR HANDLING: strerror(errno)
int main(int argc, char* argv[]) {
FILE* fp = fopen("a.txt", "r");
if(fp == NULL) {
fprintf(stderr, "%s", strerror(errno));
return EXIT_FAILURE;
}
long position_idx = ftell(fp);
printf("ftell(fp) == %ld // at beginning\n", position_idx);
char ch = fgetc(fp);
position_idx = ftell(fp);
printf("ftell(fp) == %ld // after fgetc(fp), first\n", position_idx);
while(!feof(fp) && !ferror(fp)) {
fprintf(stdout, "ch == '%c'\n", ch);
ch = fgetc(fp);
position_idx = ftell(fp);
printf("ftell(fp) == %ld // after fgetc(fp)\n", position_idx);
}
if(ferror(fp)) {
fprintf(stderr, "%s", strerror(errno));
}
return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */
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