diff --git a/src/apdu.c b/src/apdu.c
index f5d28e7..d29f629 100644
--- a/src/apdu.c
+++ b/src/apdu.c
@@ -123,12 +123,12 @@ uint16_t apdu_process(uint8_t itf, const uint8_t *buffer, uint16_t buffer_size)
 #ifndef ENABLE_EMULATION
 #ifdef USB_ITF_HID
             if (itf == ITF_HID_CTAP) {
-                driver_exec_finished_cont_hid(itf, apdu.rlen + 2, rdata_gr - apdu.rdata);
+                driver_exec_finished_cont_hid(itf, apdu.rlen + 2, (uint16_t)(rdata_gr - apdu.rdata));
             }
 #endif
 #ifdef USB_ITF_CCID
             if (itf == ITF_SC_CCID || itf == ITF_SC_WCID) {
-                driver_exec_finished_cont_ccid(itf, apdu.rlen + 2, rdata_gr - apdu.rdata);
+                driver_exec_finished_cont_ccid(itf, apdu.rlen + 2, (uint16_t)(rdata_gr - apdu.rdata));
             }
 #endif
 #else
@@ -152,12 +152,12 @@ uint16_t apdu_process(uint8_t itf, const uint8_t *buffer, uint16_t buffer_size)
 #ifndef ENABLE_EMULATION
 #ifdef USB_ITF_HID
             if (itf == ITF_HID_CTAP) {
-                driver_exec_finished_cont_hid(itf, apdu.ne + 2, rdata_gr - apdu.ne - apdu.rdata);
+                driver_exec_finished_cont_hid(itf, (uint16_t)(apdu.ne + 2), (uint16_t)(rdata_gr - apdu.ne - apdu.rdata));
             }
 #endif
 #ifdef USB_ITF_CCID
             if (itf == ITF_SC_CCID || itf == ITF_SC_WCID) {
-                driver_exec_finished_cont_ccid(itf, apdu.ne + 2, rdata_gr - apdu.ne - apdu.rdata);
+                driver_exec_finished_cont_ccid(itf, (uint16_t)(apdu.ne + 2), (uint16_t)(rdata_gr - apdu.ne - apdu.rdata));
             }
 #endif
 #else
@@ -183,7 +183,8 @@ uint16_t set_res_sw(uint8_t sw1, uint8_t sw2) {
     return make_uint16_t_be(sw1, sw2);
 }
 
-void apdu_thread(void) {
+void *apdu_thread(void *arg) {
+    (void)arg;
     card_init_core1();
     while (1) {
         uint32_t m = 0;
@@ -219,6 +220,7 @@ done:   ;
 #ifdef ESP_PLATFORM
     vTaskDelete(NULL);
 #endif
+    return NULL;
 }
 
 void apdu_finish() {
diff --git a/src/apdu.h b/src/apdu.h
index 95f5f52..d41ef71 100644
--- a/src/apdu.h
+++ b/src/apdu.h
@@ -73,6 +73,6 @@ extern int process_apdu();
 extern uint16_t apdu_process(uint8_t, const uint8_t *buffer, uint16_t buffer_size);
 extern void apdu_finish();
 extern uint16_t apdu_next();
-extern void apdu_thread();
+extern void *apdu_thread(void *);
 
 #endif
diff --git a/src/crypto_utils.c b/src/crypto_utils.c
index b52e4ab..4773ea5 100644
--- a/src/crypto_utils.c
+++ b/src/crypto_utils.c
@@ -135,7 +135,7 @@ int decrypt_with_aad(const uint8_t key[32], const uint8_t *in_buf, size_t in_len
 void double_hash_pin(const uint8_t *pin, uint16_t len, uint8_t output[32]) {
     uint8_t o1[32];
     hash_multi(pin, len, o1);
-    for (int i = 0; i < sizeof(o1); i++) {
+    for (size_t i = 0; i < sizeof(o1); i++) {
         o1[i] ^= pin[i % len];
     }
     hash_multi(o1, sizeof(o1), output);
diff --git a/src/debug.h b/src/debug.h
index c4661b6..809f9b6 100644
--- a/src/debug.h
+++ b/src/debug.h
@@ -20,16 +20,16 @@
 
 #if defined(DEBUG_APDU) && DEBUG_APDU == 1
 #define DEBUG_PAYLOAD(_p, _s) { \
-        printf("Payload %s (%d bytes) [%s:%d]:\n", #_p, (int) (_s), __FILE__, __LINE__); \
-        for (int _i = 0; _i < _s; _i += 16) { \
+        printf("Payload %s (%zu bytes) [%s:%d]:\n", #_p, (size_t)(_s), __FILE__, __LINE__); \
+        for (size_t _i = 0; _i < (size_t)(_s); _i += 16) { \
             printf("%" PRIxPTR "h : ", (uintptr_t) (_i + _p)); \
-            for (int _j = 0; _j < 16; _j++) { \
-                if (_j < _s - _i) printf("%02X ", (_p)[_i + _j]); \
+            for (size_t _j = 0; _j < 16; _j++) { \
+                if (_j < (size_t)(_s) - _i) printf("%02X ", (_p)[_i + _j]); \
                 else printf("   "); \
                 if (_j == 7) printf(" "); \
             } printf(":  "); \
-            for (int _j = 0; _j < 16; _j++) { \
-                if (_j < _s - _i && (_p)[_i + _j] > 32 && (_p)[_i + _j] != 127 && (_p)[_i + _j] < 176) printf("%c", (_p)[_i + _j]); \
+            for (size_t _j = 0; _j < 16; _j++) { \
+                if (_j < (size_t)(_s) - _i && (_p)[_i + _j] > 32 && (_p)[_i + _j] != 127 && (_p)[_i + _j] < 176) printf("%c", (_p)[_i + _j]); \
                 else printf(" "); \
                 if (_j == 7) printf(" "); \
             } \
@@ -37,9 +37,9 @@
         } printf("\n"); \
 }
 #define DEBUG_DATA(_p, _s) {                                                    \
-        printf("Data %s (%d bytes) [%s:%d]:\n", #_p, (int) (_s), __FILE__, __LINE__);      \
+        printf("Data %s (%zu bytes) [%s:%d]:\n", #_p, (size_t)(_s), __FILE__, __LINE__);      \
         char *_tmp = (char *) calloc(2 * (_s) + 1, sizeof(char)); \
-        for (int _i = 0; _i < (_s); _i++) {    \
+        for (size_t _i = 0; _i < (size_t)(_s); _i++) {    \
             sprintf(&_tmp[2 * _i], "%02X", (_p)[_i]);       \
         }                                                \
         printf("%s\n", _tmp);                             \
diff --git a/src/eac.c b/src/eac.c
index bf5ca27..502dace 100644
--- a/src/eac.c
+++ b/src/eac.c
@@ -237,7 +237,7 @@ int sm_verify() {
     uint16_t input_len = 0;
     int r = 0;
     bool add_header = (CLA(apdu) & 0xC) == 0xC;
-    int data_len = (int) (apdu.nc / sm_blocksize) * sm_blocksize;
+    size_t data_len = (size_t)(apdu.nc / sm_blocksize) * sm_blocksize;
     if (data_len % sm_blocksize) {
         data_len += sm_blocksize;
     }
diff --git a/src/fs/file.c b/src/fs/file.c
index 6cb7ebc..4d6c53a 100644
--- a/src/fs/file.c
+++ b/src/fs/file.c
@@ -282,7 +282,7 @@ void scan_region(bool persistent)
 void wait_flash_finish();
 void scan_flash() {
     initialize_flash(false); //soft initialization
-    uint32_t r1 = *(uintptr_t *) flash_read(end_rom_pool), r2 = *(uintptr_t *) flash_read(end_rom_pool + sizeof(uintptr_t));
+    uint32_t r1 = (uint32_t)(*(uintptr_t *) flash_read(end_rom_pool)), r2 = (uint32_t)(*(uintptr_t *) flash_read(end_rom_pool + sizeof(uintptr_t)));
     if ((r1 == 0xffffffff || r1 == 0xefefefef) && (r2 == 0xffffffff || r2 == 0xefefefef)) {
         printf("First initialization (or corrupted!)\n");
         uint8_t empty[sizeof(uintptr_t) * 2 + sizeof(uint32_t)];
diff --git a/src/fs/file.h b/src/fs/file.h
index 0686a74..77a73e3 100644
--- a/src/fs/file.h
+++ b/src/fs/file.h
@@ -71,6 +71,9 @@
 
 #define MAX_DYNAMIC_FILES 256
 
+#ifdef _MSC_VER
+__pragma( pack(push, 1) )
+#endif
 typedef struct file {
     const uint8_t *name;
     uint8_t *data;              //should include 2 bytes len at begining
@@ -82,7 +85,13 @@ typedef struct file {
 #ifdef ENABLE_EMULATION
     uint32_t _padding;
 #endif
-} __attribute__ ((packed)) file_t;
+}
+#ifdef _MSC_VER
+__pragma( pack(pop) )
+#else
+__attribute__ ((packed))
+#endif
+file_t;
 
 extern bool file_has_data(file_t *);
 
diff --git a/src/fs/flash.c b/src/fs/flash.c
index 24f8abd..83f8ee5 100644
--- a/src/fs/flash.c
+++ b/src/fs/flash.c
@@ -195,15 +195,15 @@ int flash_write_data_to_file(file_t *file, const uint8_t *data, uint16_t len) {
 }
 
 uint32_t flash_free_space() {
-    return last_base - start_data_pool;
+    return (uint32_t)(last_base - start_data_pool);
 }
 
 uint32_t flash_used_space() {
-    return end_data_pool - last_base;
+    return (uint32_t)(end_data_pool - last_base);
 }
 
 uint32_t flash_total_space() {
-    return end_data_pool - start_data_pool;
+    return (uint32_t)(end_data_pool - start_data_pool);
 }
 
 uint32_t flash_num_files() {
diff --git a/src/fs/low_flash.c b/src/fs/low_flash.c
index f087416..d2124bb 100644
--- a/src/fs/low_flash.c
+++ b/src/fs/low_flash.c
@@ -54,8 +54,8 @@
   #else
    #include <unistd.h>
    #include <sys/mman.h>
-   #include "queue.h"
   #endif
+  #include "queue.h"
  #endif
  #define FLASH_SECTOR_SIZE       4096
  #define XIP_BASE 0
@@ -322,7 +322,7 @@ uint8_t *flash_read(uintptr_t addr) {
 uintptr_t flash_read_uintptr(uintptr_t addr) {
     uint8_t *p = flash_read(addr);
     uintptr_t v = 0x0;
-    for (int i = 0; i < sizeof(uintptr_t); i++) {
+    for (size_t i = 0; i < sizeof(uintptr_t); i++) {
         v |= (uintptr_t) p[i] << (8 * i);
     }
     return v;
@@ -330,7 +330,7 @@ uintptr_t flash_read_uintptr(uintptr_t addr) {
 uint16_t flash_read_uint16(uintptr_t addr) {
     uint8_t *p = flash_read(addr);
     uint16_t v = 0x0;
-    for (int i = 0; i < sizeof(uint16_t); i++) {
+    for (size_t i = 0; i < sizeof(uint16_t); i++) {
         v |= p[i] << (8 * i);
     }
     return v;
diff --git a/src/fs/otp.c b/src/fs/otp.c
index ea0033e..05395a9 100644
--- a/src/fs/otp.c
+++ b/src/fs/otp.c
@@ -171,6 +171,9 @@ int otp_enable_secure_boot(uint8_t bootkey, bool secure_lock) {
     }
 #elif defined(ESP_PLATFORM)
     // TODO: Implement secure boot for ESP32-S3
+#else
+    (void)bootkey;
+    (void)secure_lock;
 #endif // PICO_RP2350
     goto err;
     err:
diff --git a/src/fs/phy.c b/src/fs/phy.c
index fca776c..8edf0f2 100644
--- a/src/fs/phy.c
+++ b/src/fs/phy.c
@@ -55,7 +55,7 @@ int phy_serialize_data(const phy_data_t *phy, uint8_t *data, uint16_t *len) {
     }
     if (phy->usb_product_present) {
         *p++ = PHY_USB_PRODUCT;
-        *p++ = strlen(phy->usb_product) + 1;
+        *p++ = (uint8_t)strlen(phy->usb_product) + 1;
         strcpy((char *)p, phy->usb_product);
         p += strlen(phy->usb_product);
         *p++ = '\0';
@@ -76,7 +76,7 @@ int phy_serialize_data(const phy_data_t *phy, uint8_t *data, uint16_t *len) {
         *p++ = phy->led_driver;
     }
 
-    *len = p - data;
+    *len = (uint8_t)(p - data);
     return PICOKEY_OK;
 }
 
diff --git a/src/main.c b/src/main.c
index 03113c8..ea9682b 100644
--- a/src/main.c
+++ b/src/main.c
@@ -118,7 +118,6 @@ bool is_req_button_pending() {
 
 bool cancel_button = false;
 
-#ifdef ENABLE_EMULATION
 #ifdef _MSC_VER
 #include <windows.h>
 struct timezone
@@ -148,7 +147,7 @@ int gettimeofday(struct timeval* tp, struct timezone* tzp)
     return 0;
 }
 #endif
-#else
+#if !defined(ENABLE_EMULATION)
 #ifdef ESP_PLATFORM
 bool picok_board_button_read() {
     int boot_state = gpio_get_level(BOOT_PIN);
@@ -307,7 +306,7 @@ int main(void) {
 #endif
     pico_get_unique_board_id(&pico_serial);
     memset(pico_serial_str, 0, sizeof(pico_serial_str));
-    for (int i = 0; i < sizeof(pico_serial); i++) {
+    for (size_t i = 0; i < sizeof(pico_serial); i++) {
         snprintf(&pico_serial_str[2 * i], 3, "%02X", pico_serial.id[i]);
     }
     mbedtls_sha256(pico_serial.id, sizeof(pico_serial.id), pico_serial_hash, false);
diff --git a/src/pico_keys.h b/src/pico_keys.h
index b78cc77..69ea1a0 100644
--- a/src/pico_keys.h
+++ b/src/pico_keys.h
@@ -75,12 +75,12 @@ static inline uint16_t get_uint16_t_be(const uint8_t *b) {
 static inline uint16_t get_uint16_t_le(const uint8_t *b) {
     return make_uint16_t_le(b[0], b[1]);
 }
-static inline uint32_t put_uint16_t_be(uint16_t n, uint8_t *b) {
+static inline uint8_t put_uint16_t_be(uint16_t n, uint8_t *b) {
     *b++ = (n >> 8) & 0xff;
     *b = n & 0xff;
     return 2;
 }
-static inline uint32_t put_uint16_t_le(uint16_t n, uint8_t *b) {
+static inline uint8_t put_uint16_t_le(uint16_t n, uint8_t *b) {
     *b++ = n & 0xff;
     *b = (n >> 8) & 0xff;
     return 2;
@@ -154,7 +154,6 @@ extern int flash_clear_file(file_t *file);
 extern int (*button_pressed_cb)(uint8_t);
 
 extern bool is_req_button_pending();
-extern uint32_t button_timeout;
 
 #define SW_BYTES_REMAINING_00()             set_res_sw(0x61, 0x00)
 #define SW_WARNING_STATE_UNCHANGED()        set_res_sw(0x62, 0x00)
diff --git a/src/rescue.c b/src/rescue.c
index d7fbec8..6a1b634 100644
--- a/src/rescue.c
+++ b/src/rescue.c
@@ -70,7 +70,7 @@ int cmd_write() {
 
     if (P1(apdu) == 0x1) { // PHY
 #ifndef ENABLE_EMULATION
-        int ret = phy_unserialize_data(apdu.data, apdu.nc, &phy_data);
+        int ret = phy_unserialize_data(apdu.data, (uint16_t)apdu.nc, &phy_data);
         if (ret == PICOKEY_OK) {
             if (phy_save() != PICOKEY_OK) {
                 return SW_EXEC_ERROR();
diff --git a/src/rng/hwrng.c b/src/rng/hwrng.c
index cf5981f..7e8ec12 100644
--- a/src/rng/hwrng.c
+++ b/src/rng/hwrng.c
@@ -24,7 +24,7 @@
 #include "hwrng.h"
 #include "bsp/board.h"
 #include "pico/rand.h"
-#elif (ESP_PLATFORM)
+#elif defined(ESP_PLATFORM)
 #include "bootloader_random.h"
 #include "esp_random.h"
 #include "esp_compat.h"
diff --git a/src/usb/hid/hid.c b/src/usb/hid/hid.c
index f61d56e..ee5e54c 100644
--- a/src/usb/hid/hid.c
+++ b/src/usb/hid/hid.c
@@ -31,7 +31,6 @@ static portMUX_TYPE mutex = portMUX_INITIALIZER_UNLOCKED;
 #include "apdu.h"
 #include "usb.h"
 
-static bool mounted = false;
 extern void init_fido();
 bool is_nk = false;
 uint8_t (*get_version_major)() = NULL;
@@ -48,14 +47,6 @@ typedef struct msg_packet {
 
 msg_packet_t msg_packet = { 0 };
 
-void tud_mount_cb() {
-    mounted = true;
-}
-
-bool driver_mounted_hid() {
-    return mounted;
-}
-
 static uint16_t *send_buffer_size = NULL;
 static write_status_t *last_write_result = NULL;
 
@@ -158,7 +149,7 @@ static bool sent_key = false;
 static bool keyboard_encode = false;
 
 void add_keyboard_buffer(const uint8_t *data, size_t data_len, bool encode) {
-    keyboard_buffer_len = MIN(sizeof(keyboard_buffer), data_len);
+    keyboard_buffer_len = (uint8_t)MIN(sizeof(keyboard_buffer), data_len);
     memcpy(keyboard_buffer, data, keyboard_buffer_len);
     keyboard_encode = encode;
 }
@@ -166,7 +157,7 @@ void add_keyboard_buffer(const uint8_t *data, size_t data_len, bool encode) {
 void append_keyboard_buffer(const uint8_t *data, size_t data_len) {
     if (keyboard_buffer_len + data_len < sizeof(keyboard_buffer)) {
         memcpy(keyboard_buffer + keyboard_buffer_len, data, MIN(sizeof(keyboard_buffer) - keyboard_buffer_len, data_len));
-        keyboard_buffer_len += MIN(sizeof(keyboard_buffer) - keyboard_buffer_len, data_len);
+        keyboard_buffer_len += (uint8_t)MIN(sizeof(keyboard_buffer) - keyboard_buffer_len, data_len);
     }
 }
 
@@ -328,7 +319,7 @@ int driver_process_usb_nopacket_hid() {
 }
 
 extern const uint8_t fido_aid[], u2f_aid[], oath_aid[];
-extern void apdu_thread(void), cbor_thread(void);
+extern void *cbor_thread(void *);
 
 int driver_process_usb_packet_hid(uint16_t read) {
     int apdu_sent = 0;
diff --git a/src/usb/tusb_config.h b/src/usb/tusb_config.h
index dffdee9..c82c21a 100644
--- a/src/usb/tusb_config.h
+++ b/src/usb/tusb_config.h
@@ -90,8 +90,12 @@ extern "C" {
 #endif
 
 #ifndef CFG_TUSB_MEM_ALIGN
+#ifdef _MSC_VER
+#define CFG_TUSB_MEM_ALIGN        __declspec(align(4))
+#else
 #define CFG_TUSB_MEM_ALIGN        __attribute__((aligned(4)))
 #endif
+#endif
 
 //--------------------------------------------------------------------
 // DEVICE CONFIGURATION
diff --git a/src/usb/usb.c b/src/usb/usb.c
index 6cdedc5..aff9347 100644
--- a/src/usb/usb.c
+++ b/src/usb/usb.c
@@ -37,13 +37,15 @@
 // Device specific functions
 static uint32_t *timeout_counter = NULL;
 static uint8_t card_locked_itf = 0; // no locked
-static void (*card_locked_func)(void) = NULL;
+static void *(*card_locked_func)(void *) = NULL;
 #ifndef ENABLE_EMULATION
 static mutex_t mutex;
 extern void usb_desc_setup();
 #endif
 #if !defined(PICO_PLATFORM) && !defined(ENABLE_EMULATION) && !defined(ESP_PLATFORM)
-#include <pthread.h>
+#ifdef _MSC_VER
+#include "pthread_win32.h"
+#endif
 pthread_t hcore0, hcore1;
 #endif
 
@@ -175,7 +177,7 @@ void card_init_core1() {
 
 uint16_t finished_data_size = 0;
 
-void card_start(uint8_t itf, void (*func)(void)) {
+void card_start(uint8_t itf, void *(*func)(void *)) {
     timeout_start();
     if (card_locked_itf != itf || card_locked_func != func) {
         if (card_locked_itf != ITF_TOTAL || card_locked_func != NULL) {
diff --git a/src/usb/usb.h b/src/usb/usb.h
index 9f87c9c..8361b4c 100644
--- a/src/usb/usb.h
+++ b/src/usb/usb.h
@@ -47,7 +47,7 @@
 #define EV_BUTTON_TIMEOUT        16
 #define EV_BUTTON_PRESSED        32
 
-static const uint8_t ITF_INVALID = 0xFF;
+enum { ITF_INVALID = 0xFF };
 
 #ifdef USB_ITF_HID
     extern uint8_t ITF_HID_CTAP, ITF_HID_KB;
@@ -77,7 +77,7 @@ extern void usb_task();
 extern queue_t usb_to_card_q;
 extern queue_t card_to_usb_q;
 
-extern void card_start(uint8_t, void (*func)(void));
+extern void card_start(uint8_t, void *(*func)(void *));
 extern void card_exit();
 extern int card_status(uint8_t itf);
 extern void usb_init();
diff --git a/src/usb/usb_descriptors.c b/src/usb/usb_descriptors.c
index 67f52c8..d4c8d4a 100644
--- a/src/usb/usb_descriptors.c
+++ b/src/usb/usb_descriptors.c
@@ -167,13 +167,13 @@ void usb_desc_setup() {
 #ifdef USB_ITF_HID
     if (ITF_HID != ITF_INVALID) {
         TUSB_DESC_TOTAL_LEN += TUD_HID_INOUT_DESC_LEN;
-        const uint8_t desc[] = { TUD_HID_INOUT_DESCRIPTOR(ITF_HID, ITF_HID + 5, HID_ITF_PROTOCOL_NONE, sizeof(desc_hid_report), EPNUM_HID, TUSB_DIR_IN_MASK | EPNUM_HID, CFG_TUD_HID_EP_BUFSIZE, 10) };
+        const uint8_t desc[] = { TUD_HID_INOUT_DESCRIPTOR(ITF_HID, ITF_HID + 5, HID_ITF_PROTOCOL_NONE, sizeof(desc_hid_report), EPNUM_HID, (uint8_t)TUSB_DIR_IN_MASK | EPNUM_HID, CFG_TUD_HID_EP_BUFSIZE, 10) };
         memcpy(p, desc, sizeof(desc));
         p += sizeof(desc);
     }
     if (ITF_KEYBOARD != ITF_INVALID) {
         TUSB_DESC_TOTAL_LEN += TUD_HID_DESC_LEN;
-        const uint8_t desc_kb[] = { TUD_HID_DESCRIPTOR(ITF_KEYBOARD, ITF_KEYBOARD + 5, HID_ITF_PROTOCOL_NONE, sizeof(desc_hid_report_kb), TUSB_DIR_IN_MASK | EPNUM_HID_KB, 16, 5) };
+        const uint8_t desc_kb[] = { TUD_HID_DESCRIPTOR(ITF_KEYBOARD, ITF_KEYBOARD + 5, HID_ITF_PROTOCOL_NONE, sizeof(desc_hid_report_kb), (uint8_t)TUSB_DIR_IN_MASK | EPNUM_HID_KB, 16, 5) };
         memcpy(p, desc_kb, sizeof(desc_kb));
         p += sizeof(desc_kb);
     }
@@ -373,8 +373,8 @@ uint16_t const *tud_descriptor_string_cb(uint8_t index, uint16_t langid) {
         uint8_t buff_avail = sizeof(_desc_str) / sizeof(_desc_str[0]) - 1;
         if (index >= 4) {
             const char *product = phy_data.usb_product_present ? phy_data.usb_product : string_desc_arr[2];
-            uint8_t len = MIN(strlen(product), buff_avail);
-            for (int ix = 0; ix < len; chr_count++, ix++) {
+            uint8_t len = (uint8_t)MIN(strlen(product), buff_avail);
+            for (size_t ix = 0; ix < len; chr_count++, ix++) {
                 _desc_str[1 + chr_count] = product[ix];
             }
             buff_avail -= len;
@@ -383,7 +383,7 @@ uint16_t const *tud_descriptor_string_cb(uint8_t index, uint16_t langid) {
                 buff_avail--;
             }
         }
-        for (int ix = 0; ix < MIN(strlen(str), buff_avail); chr_count++, ix++) {
+        for (size_t ix = 0; ix < MIN(strlen(str), buff_avail); chr_count++, ix++) {
             _desc_str[1 + chr_count] = str[ix];
         }
     }