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Diffstat (limited to 'dirent/tests/t-telldir.c')
| -rw-r--r-- | dirent/tests/t-telldir.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/dirent/tests/t-telldir.c b/dirent/tests/t-telldir.c new file mode 100644 index 0000000..e2a1763 --- /dev/null +++ b/dirent/tests/t-telldir.c @@ -0,0 +1,165 @@ +/* + * 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); +} + |