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/*
* A test program to make sure that dirent works correctly.
*
* Copyright (C) 1998-2019 Toni Ronkko
* This file is part of dirent. Dirent may be freely distributed
* under the MIT license. For all details and documentation, see
* https://github.com/tronkko/dirent
*/
/* Silence warning about strcmp being insecure (MS Visual Studio) */
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dirent.h>
#include <errno.h>
#undef NDEBUG
#include <assert.h>
static void test_telldir(void);
int
main(int argc, char *argv[])
{
(void) argc;
(void) argv;
test_telldir();
return EXIT_SUCCESS;
}
static void
test_telldir(void)
{
DIR *dir = opendir("tests/4");
if (dir == NULL) {
fprintf(stderr, "Directory tests/4 not found\n");
abort();
}
/* Get position of first file */
long pos1 = telldir(dir);
printf("pos1: %lx\n", (long) pos1);
assert(pos1 >= 0);
/* Read first file */
struct dirent *ent = readdir(dir);
assert(ent != NULL);
struct dirent ent1 = *ent;
printf("ent1: %s %lx\n", ent->d_name, (long) ent->d_off);
/* Seek back to the first position */
seekdir(dir, pos1);
/* Re-read the first entry */
ent = readdir(dir);
assert(ent != NULL);
assert(strcmp(ent->d_name, ent1.d_name) == 0);
/* Get position to second file */
long pos2 = telldir(dir);
printf("pos2: %lx\n", (long) pos2);
assert(pos2 >= 0);
/* Read second file */
ent = readdir(dir);
assert(ent != NULL);
struct dirent ent2 = *ent;
printf("ent2: %s %lx\n", ent->d_name, (long) ent->d_off);
/* Get position to third file */
long pos3 = telldir(dir);
printf("pos3: %lx\n", (long) pos3);
assert(pos3 >= 0);
/* Read third file */
ent = readdir(dir);
assert(ent != NULL);
struct dirent ent3 = *ent;
printf("ent3: %s %lx\n", ent->d_name, (long) ent->d_off);
/* Get position to fourth file */
long pos4 = telldir(dir);
printf("pos4: %lx\n", (long) pos4);
assert(pos4 >= 0);
/* Read fourth file */
ent = readdir(dir);
assert(ent != NULL);
struct dirent ent4 = *ent;
printf("ent4: %s %lx\n", ent->d_name, (long) ent->d_off);
/* Get position to fifth file */
long pos5 = telldir(dir);
printf("pos5: %lx\n", (long) pos5);
assert(pos5 >= 0);
/* Read fifth file */
ent = readdir(dir);
assert(ent != NULL);
struct dirent ent5 = *ent;
printf("ent5: %s %lx\n", ent->d_name, (long) ent->d_off);
/* Read position at the end of directory stream */
long posx = telldir(dir);
assert(posx >= 0);
printf("posx: %lx\n", (long) posx);
/* End of directory stream has been reached */
ent = readdir(dir);
assert(ent == NULL);
/* Seek back to position just before the end of stream */
seekdir(dir, posx);
/* Function telldir returns the same position when asked again */
assert(telldir(dir) == posx);
assert(telldir(dir) == posx);
assert(telldir(dir) == posx);
/* Read end of stream again */
ent = readdir(dir);
assert(ent == NULL);
/* Seek back to fifth file and read it again */
seekdir(dir, pos5);
assert(telldir(dir) == pos5);
ent = readdir(dir);
assert(ent != NULL);
assert(strcmp(ent->d_name, ent5.d_name) == 0);
/* Seek back to second file and read it again */
seekdir(dir, pos2);
assert(telldir(dir) == pos2);
ent = readdir(dir);
assert(ent != NULL);
assert(strcmp(ent->d_name, ent2.d_name) == 0);
/* Continue reading from the third file without a seek in between */
assert(telldir(dir) == pos3);
ent = readdir(dir);
assert(ent != NULL);
assert(strcmp(ent->d_name, ent3.d_name) == 0);
/* Read fourth position again */
assert(telldir(dir) == pos4);
ent = readdir(dir);
assert(ent != NULL);
assert(strcmp(ent->d_name, ent4.d_name) == 0);
/* Read fifth position again */
assert(telldir(dir) == pos5);
ent = readdir(dir);
assert(ent != NULL);
assert(strcmp(ent->d_name, ent5.d_name) == 0);
/* Read end of stream again */
assert(telldir(dir) == posx);
ent = readdir(dir);
assert(ent == NULL);
}
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