66     FILE    *fp = nullptr;  in Get()  local
72     VerifyOrExit((fp = fopen(mFilePath, "r")) != nullptr, error = OT_ERROR_NOT_FOUND);  in Get()
73     VerifyOrDie(fseek(fp, aIterator, SEEK_SET) == 0, OT_EXIT_ERROR_ERRNO);  in Get()
75     while ((ret = fgets(line, sizeof(line), fp)) != nullptr)  in Get()
117     VerifyOrDie((pos = ftell(fp)) >= 0, OT_EXIT_ERROR_ERRNO);  in Get()
121     if (fp != nullptr)  in Get()
123         fclose(fp);  in Get()
132     FILE       *fp    = nullptr;  in Add()  local
146     VerifyOrDie((fp = fopen(mFilePath, "at")) != NULL, OT_EXIT_ERROR_ERRNO);  in Add()
147     VerifyOrDie(fprintf(fp, "%s=%s\n", aKey, aValue) > 0, OT_EXIT_ERROR_ERRNO);  in Add()
150     if (fp != nullptr)  in Add()
152         fclose(fp);  in Add()
168     FILE   *fp     = nullptr;  in Clear()  local
172     VerifyOrDie((fp = fopen(mFilePath, "r")) != NULL, OT_EXIT_ERROR_ERRNO);  in Clear()
176     while (fgets(line, sizeof(line), fp) != nullptr)  in Clear()
195     if (fp != nullptr)  in Clear()
197         fclose(fp);  in Clear()