kaguya
73 lines
1.8 KiB
C
73 lines
1.8 KiB
C
#include <assert.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
#ifdef USE_HOST_LIBC
|
|
#define TEST_FILE "ftell-host-libc.tmp"
|
|
#else
|
|
#define TEST_FILE "ftell.tmp"
|
|
#endif
|
|
|
|
int main() {
|
|
FILE *file;
|
|
char str[] = "mlibc ftell test";
|
|
size_t str_size = sizeof(str) - 1;
|
|
char buffer[20];
|
|
|
|
// Clear buffer to zero
|
|
memset(buffer, 0, sizeof(buffer));
|
|
|
|
// Open the file for writing in binary mode, because ftell is unspecified
|
|
// in text mode.
|
|
file = fopen(TEST_FILE, "wb");
|
|
assert(file);
|
|
|
|
// Write string minus null terminator, flush and close.
|
|
assert(fwrite(str, 1, str_size, file) == str_size);
|
|
fflush(file);
|
|
fclose(file);
|
|
|
|
// Open the file for reading in binary mode.
|
|
file = fopen(TEST_FILE, "rb");
|
|
assert(file);
|
|
|
|
// Check position indicator at the start of the file.
|
|
assert(ftell(file) == 0);
|
|
|
|
// Read 4 bytes and check fread and ftell.
|
|
assert(fread(buffer, 1, 4, file) == 4);
|
|
assert(ftell(file) == 4);
|
|
|
|
// Rewind and check position indicator at the start of the file.
|
|
rewind(file);
|
|
assert(ftell(file) == 0);
|
|
|
|
// Read the entire file and check fread and ftell.
|
|
assert(fread(buffer, 1, str_size, file) == str_size);
|
|
assert((size_t) ftell(file) == str_size);
|
|
|
|
// Rewind and check how ftell interacts with getc.
|
|
rewind(file);
|
|
assert(fgetc(file) == 'm');
|
|
assert(ftell(file) == 1);
|
|
assert(fgetc(file) == 'l');
|
|
assert(ftell(file) == 2);
|
|
assert(fgetc(file) == 'i');
|
|
assert(ftell(file) == 3);
|
|
|
|
// Check whether ftell is decremented after ungetc
|
|
assert(ungetc('X', file) == 'X');
|
|
int ftell_after_ungetc = ftell(file);
|
|
fprintf(stderr, "ftell_after_ungetc: %d\n", ftell_after_ungetc);
|
|
assert(ftell_after_ungetc == 2);
|
|
ungetc('Y', file);
|
|
assert(ftell(file) == 1);
|
|
|
|
// Check if rewind undoes ungetc's effects on ftell
|
|
rewind(file);
|
|
assert(ftell(file) == 0);
|
|
|
|
fclose(file);
|
|
return 0;
|
|
}
|