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#define _GNU_SOURCE
#include <dirent.h>
#include <stdio.h>
#include <stdarg.h>
#include <setjmp.h>
#include <stdlib.h>
#include <string.h>
#include <stddef.h>
#include <cmocka.h>
#include <dlfcn.h>
#include <errno.h>
typedef int (*fwrite_f_type)(const void *ptr, size_t size,
size_t nmemb, FILE *stream);
typedef int (*fflush_f_type)(FILE *);
typedef fflush_f_type ferror_f_type;
/**
* @brief Simulates opening file
* @details Checks if path is equal expected value and returns given pointer
* from cmocka queue
*/
FILE *fopen(const char *path, const char *mode)
{
check_expected(path);
return mock_ptr_type(FILE *);
}
/**
* @brief Simulates closing file
* @details Does absolutely nothing, always acts as successfull close
*/
int fclose(FILE *fp)
{
check_expected(fp);
return mock_type(int);
}
/**
* @brief Simulates reading file
* @details Does not read any file, instead returns value from cmocka queue
* @return value specified by caller previously
*/
size_t fread(void *ptr, size_t size, size_t nmemb, FILE *stream)
{
char *data;
int len;
size_t ret;
check_expected(stream);
data = mock_ptr_type(char *);
len = mock_type(int);
ret = size * nmemb < len ? size * nmemb : len;
memcpy(ptr, data, ret);
return ret;
}
/**
* @brief Simulates opening directory
* @details Does not open any dir, instead returns user-specified value
* @return value specified by caller previously
*/
DIR *opendir(const char *name)
{
int err;
check_expected(name);
err = mock_type(int);
if (err)
errno = err;
return mock_ptr_type(DIR *);
}
/**
* @brief Simulates closing directory
* @details Does nothing and ends successfully.
*/
int closedir(DIR *dirp)
{
check_expected(dirp);
return mock_type(int);
}
/**
* @brief Simulates scanning directory
* @details Checks if dirp has expected value. Then consecutive values from
* cmocka queue are proceed. First value must be integer and indicates number
* of directory entries which should be returned. Next number of values indicate
* names of directory entries.
*/
int scandir(const char *dirp, struct dirent ***namelist,
int (*filter)(const struct dirent *),
int (*compar)(const struct dirent **, const struct dirent **))
{
int count;
int i, j = 0;
char *name;
struct dirent **entries;
struct dirent *entry;
int tmp, expected;
check_expected(dirp);
count = mock_type(int);
if (count > 0)
entries = calloc(count, sizeof(*entries));
else
entries = NULL;
for (i = 0; i < count; i++) {
name = mock_ptr_type(char *);
entry = malloc(sizeof(*entry));
if (strlen(name) >= NAME_MAX)
fail();
strcpy(entry->d_name, name);
entry->d_type = mock_type(unsigned char);
expected = mock_type(int);
if (filter) {
tmp = filter(entry);
assert_int_equal(tmp, expected);
if (tmp)
entries[j++] = entry;
else
free(entry);
}
}
if (compar)
qsort(entries, count, sizeof(*entries),
(int (*)(const void *,const void *))compar);
*namelist = entries;
return j;
}
/**
* @brief Simultes readlink, with user-specified behavior
* @datails Check if path and bufsiz equal expedted values and
* write to buf string given by cmocka
*/
ssize_t readlink(const char *path, char *buf, size_t bufsiz)
{
char *res;
int reslen;
check_expected(path);
check_expected(bufsiz);
res = mock_ptr_type(char *);
reslen = strlen(res);
if (bufsiz <= reslen)
fail();
strcpy(buf, res);
return reslen;
}
/**
* @brief Simulates write, with user-specified behavior
* @details Check if user is trying to write expected data
* @return value received from cmocka queue
*/
size_t fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream)
{
int ret;
/*
* Cmocka (or anything else) may want to print some errors.
* Especially when running fwrite() itself
*/
if (stream == stderr || stream == stdout) {
fwrite_f_type orig_fwrite;
orig_fwrite = (fwrite_f_type)dlsym(RTLD_NEXT, "fwrite");
return orig_fwrite(ptr, size, nmemb, stream);
}
check_expected(stream);
check_expected(ptr);
ret = mock_type(int);
if (!ret)
ret = nmemb;
return ret;
}
int mkdir(const char *pathname, mode_t mode)
{
check_expected(pathname);
check_expected(mode);
return mock_type(int);
}
/**
* @brief Does nothing.
*/
int fflush(FILE *stream)
{
if (stream == stderr || stream == stdout) {
fflush_f_type orig_fflush;
orig_fflush = (fflush_f_type)dlsym(RTLD_NEXT, "fflush");
return orig_fflush(stream);
}
return 0;
}
int ferror(FILE *stream)
{
if (stream == stderr || stream == stdout) {
ferror_f_type orig_ferror;
orig_ferror = (ferror_f_type)dlsym(RTLD_NEXT, "ferror");
return orig_ferror(stream);
}
return 0;
}
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