diff --git a/Documentation/components/libs/libc/zoneinfo.rst b/Documentation/components/libs/libc/zoneinfo.rst
index f068c711c7..e79da8818e 100644
--- a/Documentation/components/libs/libc/zoneinfo.rst
+++ b/Documentation/components/libs/libc/zoneinfo.rst
@@ -161,7 +161,7 @@ Sample Code to Mount the ROMFS Filesystem
 
      /* Use the minor number to create a name for the ROM disk block device */
 
-     snprintf(devname, 32, "/dev/ram%d", minor);
+     snprintf(devname, sizeof(devname), "/dev/ram%d", minor);
 
      /* Mount the ROMFS file system */
 
diff --git a/arch/arm/src/lc823450/lc823450_mtd.c b/arch/arm/src/lc823450/lc823450_mtd.c
index a33ccae0d0..ac494b452d 100644
--- a/arch/arm/src/lc823450/lc823450_mtd.c
+++ b/arch/arm/src/lc823450/lc823450_mtd.c
@@ -789,7 +789,7 @@ int lc823450_mtd_uninitialize(uint32_t devno)
       return -ENODEV;
     }
 
-  snprintf(devname, 16, "/dev/mtdblock%" PRId32, devno);
+  snprintf(devname, sizeof(devname), "/dev/mtdblock%" PRId32, devno);
 
 #ifdef CONFIG_MTD_REGISTRATION
   mtd_unregister(g_mtdmaster[ch]);
diff --git a/arch/arm/src/phy62xx/phyplus_stub.c b/arch/arm/src/phy62xx/phyplus_stub.c
index 0763b8bb8d..107c50a727 100644
--- a/arch/arm/src/phy62xx/phyplus_stub.c
+++ b/arch/arm/src/phy62xx/phyplus_stub.c
@@ -750,7 +750,7 @@ static int phyplus_stub_ioctl(struct file *filep, int cmd,
 int phyplus_stub_register(void)
 {
   char devname[16];
-  snprintf(devname, 16, "/dev/phyplus");
+  snprintf(devname, sizeof(devname), "/dev/phyplus");
   return register_driver(devname, &g_stub_drvrops, 0666, NULL);
 }
 
@@ -772,7 +772,7 @@ int phyplus_stub_register(void)
 void phyplus_stub_unregister(void)
 {
   char devname[16];
-  snprintf(devname, 16, "/dev/phyplus");
+  snprintf(devname, sizeof(devname), "/dev/phyplus");
   unregister_driver(devname);
 }
 
diff --git a/arch/arm/src/phy62xx/phyplus_timer_lowerhalf.c b/arch/arm/src/phy62xx/phyplus_timer_lowerhalf.c
index b98769cff7..c6a0ec7221 100644
--- a/arch/arm/src/phy62xx/phyplus_timer_lowerhalf.c
+++ b/arch/arm/src/phy62xx/phyplus_timer_lowerhalf.c
@@ -596,18 +596,16 @@ static int phyplus_getstatus(struct timer_lowerhalf_s *lower,
 int phyplus_timer_register(struct phyplus_timer_param_s
                            *phyplus_timer_param)
 {
-  const char *fmt;
   char devname[16];
 
-  fmt = "/dev/timer%u";
-
   if ((phyplus_timer_param->timer_idx < 1) ||
       (phyplus_timer_param->timer_idx > 6))
     {
       return -ENODEV;
     }
 
-  snprintf(devname, 16, fmt, (unsigned int)phyplus_timer_param->timer_idx);
+  snprintf(devname, sizeof(devname), "/dev/timer%u",
+           phyplus_timer_param->timer_idx);
   return phyplus_timer_initialize(devname, phyplus_timer_param->timer_idx);
 }
 
diff --git a/arch/arm/src/s32k1xx/s32k1xx_eeeprom.c b/arch/arm/src/s32k1xx/s32k1xx_eeeprom.c
index ead54e6a6c..1b44026a09 100644
--- a/arch/arm/src/s32k1xx/s32k1xx_eeeprom.c
+++ b/arch/arm/src/s32k1xx/s32k1xx_eeeprom.c
@@ -403,7 +403,7 @@ int s32k1xx_eeeprom_register(int minor, uint32_t size)
 
       /* Create a eeeprom device name */
 
-      snprintf(devname, 16, "/dev/eeeprom%d", minor);
+      snprintf(devname, sizeof(devname), "/dev/eeeprom%d", minor);
 
       /* Inode private data is a reference to the eeeprom device structure */
 
diff --git a/boards/arm/cxd56xx/common/src/cxd56_audio.c b/boards/arm/cxd56xx/common/src/cxd56_audio.c
index 9ddb0821cc..0cdd773f36 100644
--- a/boards/arm/cxd56xx/common/src/cxd56_audio.c
+++ b/boards/arm/cxd56xx/common/src/cxd56_audio.c
@@ -499,7 +499,7 @@ int board_audio_initialize_driver(int minor)
 
   /* Create a device name */
 
-  snprintf(devname, 12, "pcm%d",  minor);
+  snprintf(devname, sizeof(devname), "pcm%d",  minor);
 
   /* Finally, we can register the PCM/CXD56 audio device. */
 
@@ -524,7 +524,7 @@ int board_audio_initialize_driver(int minor)
 
   /* Create a device name */
 
-  snprintf(devname, 12, "pcm_in%d",  minor);
+  snprintf(devname, sizeof(devname), "pcm_in%d",  minor);
 
   /* Finally, we can register the CXD56 audio input device. */
 
diff --git a/boards/arm/lc823450/lc823450-xgevk/src/lc823450_wm8776.c b/boards/arm/lc823450/lc823450-xgevk/src/lc823450_wm8776.c
index c58b2188d3..3e377708a0 100644
--- a/boards/arm/lc823450/lc823450-xgevk/src/lc823450_wm8776.c
+++ b/boards/arm/lc823450/lc823450-xgevk/src/lc823450_wm8776.c
@@ -108,7 +108,7 @@ int lc823450_wm8776initialize(int minor)
       return  -ENODEV;
     }
 
-  snprintf(devname, 12, "pcm%d",  minor);
+  snprintf(devname, sizeof(devname), "pcm%d",  minor);
 
   ret = audio_register(devname, pcm);
 
diff --git a/boards/arm/lpc31xx/ea3131/src/lpc31_fillpage.c b/boards/arm/lpc31xx/ea3131/src/lpc31_fillpage.c
index f06e7aceb0..7b321b837a 100644
--- a/boards/arm/lpc31xx/ea3131/src/lpc31_fillpage.c
+++ b/boards/arm/lpc31xx/ea3131/src/lpc31_fillpage.c
@@ -256,7 +256,8 @@ static inline void lpc31_initsrc(void)
 
       /* Now mount the file system */
 
-      snprintf(devname, 16, "/dev/mmcsd%d", CONFIG_EA3131_PAGING_MINOR);
+      snprintf(devname, sizeof(devname), "/dev/mmcsd%d",
+               CONFIG_EA3131_PAGING_MINOR);
       ret = nx_mount(devname, CONFIG_EA3131_PAGING_MOUNTPT, "vfat",
                      MS_RDONLY, NULL);
       DEBUGASSERT(ret == OK);
diff --git a/boards/arm/lpc31xx/ea3152/src/lpc31_fillpage.c b/boards/arm/lpc31xx/ea3152/src/lpc31_fillpage.c
index 46bb94187f..bb297e2fce 100644
--- a/boards/arm/lpc31xx/ea3152/src/lpc31_fillpage.c
+++ b/boards/arm/lpc31xx/ea3152/src/lpc31_fillpage.c
@@ -257,7 +257,8 @@ static inline void lpc31_initsrc(void)
 
       /* Now mount the file system */
 
-      snprintf(devname, 16, "/dev/mmcsd%d", CONFIG_EA3152_PAGING_MINOR);
+      snprintf(devname, sizeof(devname), "/dev/mmcsd%d",
+               CONFIG_EA3152_PAGING_MINOR);
       ret = nx_mount(devname, CONFIG_EA3152_PAGING_MOUNTPT, "vfat",
                      MS_RDONLY, NULL);
       DEBUGASSERT(ret == OK);
diff --git a/boards/arm/rp2040/common/src/rp2040_bmp180.c b/boards/arm/rp2040/common/src/rp2040_bmp180.c
index 59bea0afae..a8aa0bc92d 100644
--- a/boards/arm/rp2040/common/src/rp2040_bmp180.c
+++ b/boards/arm/rp2040/common/src/rp2040_bmp180.c
@@ -93,7 +93,7 @@ int board_bmp180_initialize(int busno)
     {
       /* Then try to register the barometer sensor in I2C0 */
 
-      snprintf(devpath, 12, "/dev/press%d", devno);
+      snprintf(devpath, sizeof(devpath), "/dev/press%d", devno);
       ret = bmp180_register(devpath, i2c);
       if (ret < 0)
         {
diff --git a/boards/arm/rp2040/common/src/rp2040_i2sdev.c b/boards/arm/rp2040/common/src/rp2040_i2sdev.c
index 1b48dc6e84..183c394891 100644
--- a/boards/arm/rp2040/common/src/rp2040_i2sdev.c
+++ b/boards/arm/rp2040/common/src/rp2040_i2sdev.c
@@ -82,7 +82,7 @@ int board_i2sdev_initialize(int port)
       return  -ENODEV;
     }
 
-  snprintf(devname, 12, "pcm%d", port);
+  snprintf(devname, sizeof(devname), "pcm%d", port);
 
   ret = audio_register(devname, pcm);
 
diff --git a/boards/arm/rp2040/common/src/rp2040_ina219.c b/boards/arm/rp2040/common/src/rp2040_ina219.c
index 13607a819a..caa5b94594 100644
--- a/boards/arm/rp2040/common/src/rp2040_ina219.c
+++ b/boards/arm/rp2040/common/src/rp2040_ina219.c
@@ -92,7 +92,7 @@ int board_ina219_initialize(int busno)
 
   /* Then register the sensor */
 
-  snprintf(devpath, 14, "/dev/voltamp%d", devno);
+  snprintf(devpath, sizeof(devpath), "/dev/voltamp%d", devno);
   ret = ina219_register(devpath, i2c, 0x40, 100000, 0x00);
   if (ret < 0)
     {
diff --git a/boards/arm/rp2040/common/src/rp2040_lcd_backpack.c b/boards/arm/rp2040/common/src/rp2040_lcd_backpack.c
index a488f7019c..771e32f0a5 100644
--- a/boards/arm/rp2040/common/src/rp2040_lcd_backpack.c
+++ b/boards/arm/rp2040/common/src/rp2040_lcd_backpack.c
@@ -86,7 +86,7 @@ int board_lcd_backpack_init(int devno, int busno, int rows, int cols)
 
   /* Register the Segment LCD */
 
-  snprintf(devpath, 12, "/dev/slcd%d", devno);
+  snprintf(devpath, sizeof(devpath), "/dev/slcd%d", devno);
   ret = pcf8574_lcd_backpack_register(devpath, i2c, &cfg);
   if (ret < 0)
     {
diff --git a/boards/arm/rp2040/common/src/rp2040_max6675.c b/boards/arm/rp2040/common/src/rp2040_max6675.c
index 5188118b30..7230da8d29 100644
--- a/boards/arm/rp2040/common/src/rp2040_max6675.c
+++ b/boards/arm/rp2040/common/src/rp2040_max6675.c
@@ -74,7 +74,7 @@ int board_max6675_initialize(int devno, int busno)
 
   /* Then register the temperature sensor */
 
-  snprintf(devpath, 12, "/dev/temp%d", devno);
+  snprintf(devpath, sizeof(devpath), "/dev/temp%d", devno);
   ret = max6675_register(devpath, spi);
   if (ret < 0)
     {
diff --git a/boards/arm/s32k1xx/rddrone-bms772/src/s32k1xx_smbus_sbd.c b/boards/arm/s32k1xx/rddrone-bms772/src/s32k1xx_smbus_sbd.c
index 0d48fb45a0..31acc5c919 100644
--- a/boards/arm/s32k1xx/rddrone-bms772/src/s32k1xx_smbus_sbd.c
+++ b/boards/arm/s32k1xx/rddrone-bms772/src/s32k1xx_smbus_sbd.c
@@ -770,7 +770,7 @@ int smbus_sbd_initialize(int minor, struct i2c_slave_s *i2c_slave_dev)
 {
   irqstate_t flags;
   struct smbus_sbd_dev_s *smbus_sbd_dev;
-  char dev_name[24];
+  char devname[24];
   int ret;
 
   /* Make sure the initialization is not interrupted */
@@ -789,13 +789,13 @@ int smbus_sbd_initialize(int minor, struct i2c_slave_s *i2c_slave_dev)
     {
       /* Create the device name string */
 
-      snprintf(dev_name, 24, "/dev/smbus-sbd%d", minor);
+      snprintf(devname, sizeof(devname), "/dev/smbus-sbd%d", minor);
 
       /* Register the driver.  The associated private data is a reference to
        * the SMBus Smart Battery Data slave device structure.
        */
 
-      ret = register_driver(dev_name, &g_smbus_sbd_fops, 0, smbus_sbd_dev);
+      ret = register_driver(devname, &g_smbus_sbd_fops, 0, smbus_sbd_dev);
       if (ret < 0)
         {
           ferr("register_driver failed: %d\n", -ret);
diff --git a/boards/arm/sama5/sama5d3x-ek/src/sam_wm8904.c b/boards/arm/sama5/sama5d3x-ek/src/sam_wm8904.c
index bef50be7ae..dde2808e81 100644
--- a/boards/arm/sama5/sama5d3x-ek/src/sam_wm8904.c
+++ b/boards/arm/sama5/sama5d3x-ek/src/sam_wm8904.c
@@ -334,7 +334,7 @@ int sam_wm8904_initialize(int minor)
 
       /* Create a device name */
 
-      snprintf(devname, 12, "pcm%d",  minor);
+      snprintf(devname, sizeof(devname), "pcm%d",  minor);
 
       /* Finally, we can register the PCM/WM8904/I2C/I2S audio device.
        *
diff --git a/boards/arm/sama5/sama5d4-ek/src/sam_audio_null.c b/boards/arm/sama5/sama5d4-ek/src/sam_audio_null.c
index 6e4a8ea3bc..c7428f9ad2 100644
--- a/boards/arm/sama5/sama5d4-ek/src/sam_audio_null.c
+++ b/boards/arm/sama5/sama5d4-ek/src/sam_audio_null.c
@@ -123,7 +123,7 @@ int sam_audio_null_initialize(int minor)
 
       /* Create a device name */
 
-      snprintf(devname, 12, "pcm%d",  minor);
+      snprintf(devname, sizeof(devname), "pcm%d",  minor);
 
       /* Finally, we can register the PCM/NULL audio device. */
 
diff --git a/boards/arm/sama5/sama5d4-ek/src/sam_wm8904.c b/boards/arm/sama5/sama5d4-ek/src/sam_wm8904.c
index 56b05922f7..005cca295b 100644
--- a/boards/arm/sama5/sama5d4-ek/src/sam_wm8904.c
+++ b/boards/arm/sama5/sama5d4-ek/src/sam_wm8904.c
@@ -334,7 +334,7 @@ int sam_wm8904_initialize(int minor)
 
       /* Create a device name */
 
-      snprintf(devname, 12, "pcm%d",  minor);
+      snprintf(devname, sizeof(devname), "pcm%d",  minor);
 
       /* Finally, we can register the PCM/WM8904/I2C/I2S audio device.
        *
diff --git a/boards/arm/samv7/samv71-xult/src/sam_audio_null.c b/boards/arm/samv7/samv71-xult/src/sam_audio_null.c
index a78f1fc0f7..8acc27cbb5 100644
--- a/boards/arm/samv7/samv71-xult/src/sam_audio_null.c
+++ b/boards/arm/samv7/samv71-xult/src/sam_audio_null.c
@@ -123,7 +123,7 @@ int sam_audio_null_initialize(int minor)
 
       /* Create a device name */
 
-      snprintf(devname, 12, "pcm%d",  minor);
+      snprintf(devname, sizeof(devname), "pcm%d",  minor);
 
       /* Finally, we can register the PCM/NULL audio device. */
 
diff --git a/boards/arm/samv7/samv71-xult/src/sam_wm8904.c b/boards/arm/samv7/samv71-xult/src/sam_wm8904.c
index ae7560b223..bb7cb57522 100644
--- a/boards/arm/samv7/samv71-xult/src/sam_wm8904.c
+++ b/boards/arm/samv7/samv71-xult/src/sam_wm8904.c
@@ -334,7 +334,7 @@ int sam_wm8904_initialize(int minor)
 
       /* Create a device name */
 
-      snprintf(devname, 12, "pcm%d",  minor);
+      snprintf(devname, sizeof(devname), "pcm%d",  minor);
 
       /* Finally, we can register the PCM/WM8904/I2C/I2S audio device.
        *
diff --git a/boards/arm/stm32/axoloti/src/stm32_adau1961.c b/boards/arm/stm32/axoloti/src/stm32_adau1961.c
index 9b5a21e538..4c4fba9736 100644
--- a/boards/arm/stm32/axoloti/src/stm32_adau1961.c
+++ b/boards/arm/stm32/axoloti/src/stm32_adau1961.c
@@ -178,7 +178,7 @@ int stm32_adau1961_initialize(int minor)
 
       /* Create a device name */
 
-      snprintf(devname, 12, "pcm%d", minor);
+      snprintf(devname, sizeof(devname), "pcm%d", minor);
 
       /* Finally, we can register the ADAU1961/I2C/I2S audio device. */
 
diff --git a/boards/arm/stm32/cloudctrl/src/stm32_w25.c b/boards/arm/stm32/cloudctrl/src/stm32_w25.c
index 570d8b9a78..ae309b5af9 100644
--- a/boards/arm/stm32/cloudctrl/src/stm32_w25.c
+++ b/boards/arm/stm32/cloudctrl/src/stm32_w25.c
@@ -125,7 +125,7 @@ int stm32_w25initialize(int minor)
 
   /* Mount the file system at /mnt/w25 */
 
-  snprintf(devname, 12, "/mnt/w25%c", 'a' + minor);
+  snprintf(devname, sizeof(devname), "/mnt/w25%c", 'a' + minor);
   ret = nx_mount(NULL, devname, "nxffs", 0, NULL);
   if (ret < 0)
     {
diff --git a/boards/arm/stm32/common/src/board_hall3ph.c b/boards/arm/stm32/common/src/board_hall3ph.c
index 913d0fc3d7..ad0790eaef 100644
--- a/boards/arm/stm32/common/src/board_hall3ph.c
+++ b/boards/arm/stm32/common/src/board_hall3ph.c
@@ -63,7 +63,7 @@ int board_hall3ph_initialize(int devno, int pha, int phb, int phc)
 
   /* Initialize a Hall effect sensor interface. */
 
-  snprintf(devpath, 12, "/dev/hall%d", devno);
+  snprintf(devpath, sizeof(devpath), "/dev/hall%d", devno);
 
   ret = stm32_hall3ph_initialize(devpath, &cfg);
   if (ret < 0)
diff --git a/boards/arm/stm32/common/src/stm32_apa102.c b/boards/arm/stm32/common/src/stm32_apa102.c
index 3f37ab891a..b3eedc7d25 100644
--- a/boards/arm/stm32/common/src/stm32_apa102.c
+++ b/boards/arm/stm32/common/src/stm32_apa102.c
@@ -93,7 +93,7 @@ int board_apa102_initialize(int devno, int spino)
 
   /* Register the APA102 Driver at the specified location. */
 
-  snprintf(devpath, 13, "/dev/leddrv%d", devno);
+  snprintf(devpath, sizeof(devpath), "/dev/leddrv%d", devno);
   ret = apa102_register(devpath, spi);
   if (ret < 0)
     {
diff --git a/boards/arm/stm32/common/src/stm32_apds9960.c b/boards/arm/stm32/common/src/stm32_apds9960.c
index 3f5f5be6b1..1513330b8d 100644
--- a/boards/arm/stm32/common/src/stm32_apds9960.c
+++ b/boards/arm/stm32/common/src/stm32_apds9960.c
@@ -154,7 +154,7 @@ int board_apds9960_initialize(int devno, int busno)
 
   /* Then register the gesture sensor */
 
-  snprintf(devpath, 12, "/dev/gest%d", devno);
+  snprintf(devpath, sizeof(devpath), "/dev/gest%d", devno);
   ret = apds9960_register(devpath, &g_apds9960config.config);
   if (ret < 0)
     {
diff --git a/boards/arm/stm32/common/src/stm32_bh1750.c b/boards/arm/stm32/common/src/stm32_bh1750.c
index 612ded26b5..ec16aa7d7f 100644
--- a/boards/arm/stm32/common/src/stm32_bh1750.c
+++ b/boards/arm/stm32/common/src/stm32_bh1750.c
@@ -76,7 +76,7 @@ int board_bh1750_initialize(int devno, int busno)
 
   /* Then register the ambient light sensor */
 
-  snprintf(devpath, 12, "/dev/light%d", devno);
+  snprintf(devpath, sizeof(devpath), "/dev/light%d", devno);
   ret = bh1750fvi_register(devpath, i2c, BH1750FVI_I2C_ADDR);
   if (ret < 0)
     {
diff --git a/boards/arm/stm32/common/src/stm32_bmp180.c b/boards/arm/stm32/common/src/stm32_bmp180.c
index 5cae7288d6..72a222968e 100644
--- a/boards/arm/stm32/common/src/stm32_bmp180.c
+++ b/boards/arm/stm32/common/src/stm32_bmp180.c
@@ -92,7 +92,7 @@ int board_bmp180_initialize(int devno, int busno)
 
   /* Then register the barometer sensor */
 
-  snprintf(devpath, 12, "/dev/press%d", devno);
+  snprintf(devpath, sizeof(devpath), "/dev/press%d", devno);
   ret = bmp180_register(devpath, i2c);
   if (ret < 0)
     {
diff --git a/boards/arm/stm32/common/src/stm32_dhtxx.c b/boards/arm/stm32/common/src/stm32_dhtxx.c
index 37f50eeccb..cd92b6061b 100644
--- a/boards/arm/stm32/common/src/stm32_dhtxx.c
+++ b/boards/arm/stm32/common/src/stm32_dhtxx.c
@@ -143,7 +143,7 @@ int board_dhtxx_initialize(int devno)
       return -ENODEV;
     }
 
-  snprintf(devpath, 12, "/dev/hum%d", devno);
+  snprintf(devpath, sizeof(devpath), "/dev/hum%d", devno);
   ret = dhtxx_register(devpath, &g_dhtxx_config);
   if (ret < 0)
     {
diff --git a/boards/arm/stm32/common/src/stm32_drv8825.c b/boards/arm/stm32/common/src/stm32_drv8825.c
index 28fe8f402c..9e597658a8 100644
--- a/boards/arm/stm32/common/src/stm32_drv8825.c
+++ b/boards/arm/stm32/common/src/stm32_drv8825.c
@@ -190,7 +190,7 @@ int board_drv8825_initialize(int devno)
 
     drv8825_initialize();
 
-    snprintf(devname, 15, "/dev/stepper%d", devno);
+    snprintf(devname, sizeof(devname), "/dev/stepper%d", devno);
 
     ret = drv8825_register(devname, &g_drv8825_ops);
 
diff --git a/boards/arm/stm32/common/src/stm32_hcsr04.c b/boards/arm/stm32/common/src/stm32_hcsr04.c
index c18c08b326..17eec94b3a 100644
--- a/boards/arm/stm32/common/src/stm32_hcsr04.c
+++ b/boards/arm/stm32/common/src/stm32_hcsr04.c
@@ -241,6 +241,6 @@ int board_hcsr04_initialize(int devno)
       return -ENODEV;
     }
 
-  snprintf(devpath, 12, "/dev/dist%d", devno);
+  snprintf(devpath, sizeof(devpath), "/dev/dist%d", devno);
   return hcsr04_register(devpath, &g_hcsr04config.config);
 }
diff --git a/boards/arm/stm32/common/src/stm32_ina219.c b/boards/arm/stm32/common/src/stm32_ina219.c
index 16cddb37e6..4b557dccd8 100644
--- a/boards/arm/stm32/common/src/stm32_ina219.c
+++ b/boards/arm/stm32/common/src/stm32_ina219.c
@@ -93,7 +93,7 @@ int board_ina219_initialize(int devno, int busno)
 
   /* Then register the sensor */
 
-  snprintf(devpath, 12, "/dev/ina%d", devno);
+  snprintf(devpath, sizeof(devpath), "/dev/ina%d", devno);
   ret = ina219_register(devpath, i2c, 0x40, 100000, 0x00);
   if (ret < 0)
     {
diff --git a/boards/arm/stm32/common/src/stm32_lcd_backpack.c b/boards/arm/stm32/common/src/stm32_lcd_backpack.c
index d7a75e2fa8..f811e7d8e1 100644
--- a/boards/arm/stm32/common/src/stm32_lcd_backpack.c
+++ b/boards/arm/stm32/common/src/stm32_lcd_backpack.c
@@ -84,7 +84,7 @@ int board_lcd_backpack_init(int devno, int busno, int rows, int cols)
 
   /* Register the Segment LCD */
 
-  snprintf(devpath, 12, "/dev/slcd%d", devno);
+  snprintf(devpath, sizeof(devpath), "/dev/slcd%d", devno);
   ret = pcf8574_lcd_backpack_register(devpath, i2c, &cfg);
   if (ret < 0)
     {
diff --git a/boards/arm/stm32/common/src/stm32_lis3dsh.c b/boards/arm/stm32/common/src/stm32_lis3dsh.c
index b57067ee8d..bbd89d55c4 100644
--- a/boards/arm/stm32/common/src/stm32_lis3dsh.c
+++ b/boards/arm/stm32/common/src/stm32_lis3dsh.c
@@ -107,7 +107,7 @@ int board_lis3dsh_initialize(int devno, int busno)
     }
   else
     {
-      snprintf(devpath, 12, "/dev/acc%d", devno);
+      snprintf(devpath, sizeof(devpath), "/dev/acc%d", devno);
       ret = lis3dsh_register(devpath, spi, &acc0_config);
     }
 
diff --git a/boards/arm/stm32/common/src/stm32_lm75.c b/boards/arm/stm32/common/src/stm32_lm75.c
index ee9751ad81..8d6ae903a2 100644
--- a/boards/arm/stm32/common/src/stm32_lm75.c
+++ b/boards/arm/stm32/common/src/stm32_lm75.c
@@ -92,7 +92,7 @@ int board_lm75_initialize(int devno, int busno)
 
   /* Then register the temperature sensor */
 
-  snprintf(devpath, 12, "/dev/temp%d", devno);
+  snprintf(devpath, sizeof(devpath), "/dev/temp%d", devno);
   ret = lm75_register(devpath, i2c, 0x48);
   if (ret < 0)
     {
diff --git a/boards/arm/stm32/common/src/stm32_max31855.c b/boards/arm/stm32/common/src/stm32_max31855.c
index cd5dac76fc..8ec569dc6f 100644
--- a/boards/arm/stm32/common/src/stm32_max31855.c
+++ b/boards/arm/stm32/common/src/stm32_max31855.c
@@ -69,7 +69,7 @@ int board_max31855_initialize(int devno, int busno)
 
   /* Then register the temperature sensor */
 
-  snprintf(devpath, 12, "/dev/temp%d", devno);
+  snprintf(devpath, sizeof(devpath), "/dev/temp%d", devno);
   ret = max31855_register(devpath, spi, devno);
   if (ret < 0)
     {
diff --git a/boards/arm/stm32/common/src/stm32_max6675.c b/boards/arm/stm32/common/src/stm32_max6675.c
index 19c7b26cd7..6c4befa06c 100644
--- a/boards/arm/stm32/common/src/stm32_max6675.c
+++ b/boards/arm/stm32/common/src/stm32_max6675.c
@@ -90,7 +90,7 @@ int board_max6675_initialize(int devno, int busno)
 
   /* Then register the temperature sensor */
 
-  snprintf(devpath, 12, "/dev/temp%d", devno);
+  snprintf(devpath, sizeof(devpath), "/dev/temp%d", devno);
   ret = max6675_register(devpath, spi);
   if (ret < 0)
     {
diff --git a/boards/arm/stm32/common/src/stm32_mlx90614.c b/boards/arm/stm32/common/src/stm32_mlx90614.c
index f497eb4753..4b1e6b5d6e 100644
--- a/boards/arm/stm32/common/src/stm32_mlx90614.c
+++ b/boards/arm/stm32/common/src/stm32_mlx90614.c
@@ -78,7 +78,7 @@ int board_mlx90614_initialize(int devno, int busno)
 
   /* Then register the Infrared Thermometer sensor */
 
-  snprintf(devpath, 12, "/dev/therm%d", devno);
+  snprintf(devpath, sizeof(devpath), "/dev/therm%d", devno);
   ret = mlx90614_register(devpath, i2c, MLX90614_ADDRESS);
   if (ret < 0)
     {
diff --git a/boards/arm/stm32/common/src/stm32_mpl115a.c b/boards/arm/stm32/common/src/stm32_mpl115a.c
index 3bf0e89647..00bb2def06 100644
--- a/boards/arm/stm32/common/src/stm32_mpl115a.c
+++ b/boards/arm/stm32/common/src/stm32_mpl115a.c
@@ -72,7 +72,7 @@ int board_mpl115a_initialize(int devno, int busno)
 
   /* Then register the barometer sensor */
 
-  snprintf(devpath, 12, "/dev/press%d", devno);
+  snprintf(devpath, sizeof(devpath), "/dev/press%d", devno);
   ret = mpl115a_register(devpath, spi);
   if (ret < 0)
     {
diff --git a/boards/arm/stm32/common/src/stm32_nunchuck.c b/boards/arm/stm32/common/src/stm32_nunchuck.c
index 31259d14d7..d8bc0df3e7 100644
--- a/boards/arm/stm32/common/src/stm32_nunchuck.c
+++ b/boards/arm/stm32/common/src/stm32_nunchuck.c
@@ -98,7 +98,7 @@ int board_nunchuck_initialize(int devno, int busno)
 
   /* Register the joystick device as /dev/nunchuck0 */
 
-  snprintf(devpath, 15, "/dev/nunchuck%d", devno);
+  snprintf(devpath, sizeof(devpath), "/dev/nunchuck%d", devno);
   iinfo("Initialize joystick driver: %s\n", devpath);
 
   ret = nunchuck_register(devpath, i2c);
diff --git a/boards/arm/stm32/common/src/stm32_qencoder.c b/boards/arm/stm32/common/src/stm32_qencoder.c
index 0a31bc9ee1..3a53d055fb 100644
--- a/boards/arm/stm32/common/src/stm32_qencoder.c
+++ b/boards/arm/stm32/common/src/stm32_qencoder.c
@@ -55,7 +55,7 @@ int board_qencoder_initialize(int devno, int timerno)
   /* Initialize a quadrature encoder interface. */
 
   sninfo("Initializing the quadrature encoder using TIM%d\n", timerno);
-  snprintf(devpath, 12, "/dev/qe%d", devno);
+  snprintf(devpath, sizeof(devpath), "/dev/qe%d", devno);
   ret = stm32_qeinitialize(devpath, timerno);
   if (ret < 0)
     {
diff --git a/boards/arm/stm32/common/src/stm32_tone.c b/boards/arm/stm32/common/src/stm32_tone.c
index bbb0d6994f..1980d7b5e2 100644
--- a/boards/arm/stm32/common/src/stm32_tone.c
+++ b/boards/arm/stm32/common/src/stm32_tone.c
@@ -115,7 +115,7 @@ int board_tone_initialize(int devno)
 
       /* Register the Audio Tone driver at "/dev/tone0" */
 
-      snprintf(devpath, 12, "/dev/tone%d", devno);
+      snprintf(devpath, sizeof(devpath), "/dev/tone%d", devno);
       ret = tone_register(devpath, tone, oneshot);
       if (ret < 0)
         {
diff --git a/boards/arm/stm32/common/src/stm32_veml6070.c b/boards/arm/stm32/common/src/stm32_veml6070.c
index 613d6f6d69..c30e9b2605 100644
--- a/boards/arm/stm32/common/src/stm32_veml6070.c
+++ b/boards/arm/stm32/common/src/stm32_veml6070.c
@@ -99,7 +99,7 @@ int board_veml6070_initialize(int devno, int busno)
 
   /* Then register the light sensor */
 
-  snprintf(devpath, 14, "/dev/uvlight%d", devno);
+  snprintf(devpath, sizeof(devpath), "/dev/uvlight%d", devno);
   ret = veml6070_register(devpath, i2c, VEML6070_I2C_DATA_LSB_CMD_ADDR);
   if (ret < 0)
     {
diff --git a/boards/arm/stm32/common/src/stm32_ws2812.c b/boards/arm/stm32/common/src/stm32_ws2812.c
index 9b5cd5eb78..3e0ca54fc9 100644
--- a/boards/arm/stm32/common/src/stm32_ws2812.c
+++ b/boards/arm/stm32/common/src/stm32_ws2812.c
@@ -94,7 +94,7 @@ int board_ws2812_initialize(int devno, int spino, uint16_t nleds)
 
   /* Register the WS2812 driver at the specified location. */
 
-  snprintf(devpath, 13, "/dev/leddrv%d", devno);
+  snprintf(devpath, sizeof(devpath), "/dev/leddrv%d", devno);
   ret = ws2812_leds_register(devpath, spi, nleds);
   if (ret < 0)
     {
diff --git a/boards/arm/stm32/fire-stm32v2/src/stm32_w25.c b/boards/arm/stm32/fire-stm32v2/src/stm32_w25.c
index da6810905d..be5a66bb12 100644
--- a/boards/arm/stm32/fire-stm32v2/src/stm32_w25.c
+++ b/boards/arm/stm32/fire-stm32v2/src/stm32_w25.c
@@ -125,7 +125,7 @@ int stm32_w25initialize(int minor)
 
   /* Mount the file system at /mnt/w25 */
 
-  snprintf(devname, 12, "/mnt/w25%c", 'a' + minor);
+  snprintf(devname, sizeof(devname), "/mnt/w25%c", 'a' + minor);
   ret = nx_mount(NULL, devname, "nxffs", 0, NULL);
   if (ret < 0)
     {
diff --git a/boards/arm/stm32/olimex-stm32-p407/src/stm32_cs4344.c b/boards/arm/stm32/olimex-stm32-p407/src/stm32_cs4344.c
index d0d16233b4..7e3542dcf3 100644
--- a/boards/arm/stm32/olimex-stm32-p407/src/stm32_cs4344.c
+++ b/boards/arm/stm32/olimex-stm32-p407/src/stm32_cs4344.c
@@ -141,7 +141,7 @@ int stm32_cs4344_initialize(int minor)
 
       /* Create a device name */
 
-      snprintf(devname, 12, "pcm%d",  minor);
+      snprintf(devname, sizeof(devname), "pcm%d",  minor);
 
       /* Finally, we can register the PCM/CS4344/I2S audio device.
        *
diff --git a/boards/arm/stm32/shenzhou/src/stm32_w25.c b/boards/arm/stm32/shenzhou/src/stm32_w25.c
index c6ffead272..96443aed70 100644
--- a/boards/arm/stm32/shenzhou/src/stm32_w25.c
+++ b/boards/arm/stm32/shenzhou/src/stm32_w25.c
@@ -126,7 +126,7 @@ int stm32_w25initialize(int minor)
 
   /* Mount the file system at /mnt/w25 */
 
-  snprintf(devname, 12, "/mnt/w25%c", 'a' + minor);
+  snprintf(devname, sizeof(devname), "/mnt/w25%c", 'a' + minor);
   ret = nx_mount(NULL, devname, "nxffs", 0, NULL);
   if (ret < 0)
     {
diff --git a/boards/arm/stm32/stm32f4discovery/src/stm32_cs43l22.c b/boards/arm/stm32/stm32f4discovery/src/stm32_cs43l22.c
index 60602fc43b..4bf6a67fe6 100644
--- a/boards/arm/stm32/stm32f4discovery/src/stm32_cs43l22.c
+++ b/boards/arm/stm32/stm32f4discovery/src/stm32_cs43l22.c
@@ -342,7 +342,7 @@ int stm32_cs43l22_initialize(int minor)
 
       /* Create a device name */
 
-      snprintf(devname, 12, "pcm%d",  minor);
+      snprintf(devname, sizeof(devname), "pcm%d",  minor);
 
       /* Finally, we can register the PCM/CS43L22/I2C/I2S audio device.
        *
diff --git a/boards/arm/stm32f7/common/src/stm32_cs4344.c b/boards/arm/stm32f7/common/src/stm32_cs4344.c
index 221cc7fd69..6d52353e83 100644
--- a/boards/arm/stm32f7/common/src/stm32_cs4344.c
+++ b/boards/arm/stm32f7/common/src/stm32_cs4344.c
@@ -140,7 +140,7 @@ int board_cs4344_initialize(int devno, int port)
 
       /* Create a device name */
 
-      snprintf(devname, 12, "pcm%d",  devno);
+      snprintf(devname, sizeof(devname), "pcm%d",  devno);
 
       /* Finally, we can register the PCM/CS4344/I2S audio device.
        *
diff --git a/boards/arm/stm32f7/stm32f746g-disco/src/stm32_wm8994.c b/boards/arm/stm32f7/stm32f746g-disco/src/stm32_wm8994.c
index 6518ab90ea..eab931cae4 100644
--- a/boards/arm/stm32f7/stm32f746g-disco/src/stm32_wm8994.c
+++ b/boards/arm/stm32f7/stm32f746g-disco/src/stm32_wm8994.c
@@ -286,7 +286,7 @@ int stm32_wm8994_initialize(int minor)
 
       /* Create a device name */
 
-      snprintf(devname, 12, "pcm%d", minor);
+      snprintf(devname, sizeof(devname), "pcm%d", minor);
 
       /* Finally, we can register the ADAU1961/I2C/I2S audio device. */
 
diff --git a/boards/arm/stm32h7/nucleo-h745zi/src/stm32_adc.c b/boards/arm/stm32h7/nucleo-h745zi/src/stm32_adc.c
index e5c80f4073..5c1a4217c8 100644
--- a/boards/arm/stm32h7/nucleo-h745zi/src/stm32_adc.c
+++ b/boards/arm/stm32h7/nucleo-h745zi/src/stm32_adc.c
@@ -142,7 +142,7 @@ int stm32_adc_setup(int adcno)
 
   if (!initialized)
     {
-      snprintf(devname, 1, "/dev/adc%d", adcno);
+      snprintf(devname, sizeof(devname), "/dev/adc%d", adcno);
 
 #endif
 #if defined(CONFIG_STM32H7_ADC1)
diff --git a/boards/risc-v/esp32c3-legacy/common/src/esp32c3_board_bmp180.c b/boards/risc-v/esp32c3-legacy/common/src/esp32c3_board_bmp180.c
index 9f223bbac8..889f9e0df8 100644
--- a/boards/risc-v/esp32c3-legacy/common/src/esp32c3_board_bmp180.c
+++ b/boards/risc-v/esp32c3-legacy/common/src/esp32c3_board_bmp180.c
@@ -70,7 +70,7 @@ int board_bmp180_initialize(int devno, int busno)
     {
       /* Then try to register the barometer sensor in I2C0 */
 
-      snprintf(devpath, 12, "/dev/press%d", devno);
+      snprintf(devpath, sizeof(devpath), "/dev/press%d", devno);
       ret = bmp180_register(devpath, i2c);
       if (ret < 0)
         {
diff --git a/boards/risc-v/esp32c3/common/src/esp_board_bmp180.c b/boards/risc-v/esp32c3/common/src/esp_board_bmp180.c
index 1748214a93..4161a9e77f 100644
--- a/boards/risc-v/esp32c3/common/src/esp_board_bmp180.c
+++ b/boards/risc-v/esp32c3/common/src/esp_board_bmp180.c
@@ -70,7 +70,7 @@ int board_bmp180_initialize(int devno)
     {
       /* Then try to register the barometer sensor in I2C0 */
 
-      snprintf(devpath, 12, "/dev/press%d", devno);
+      snprintf(devpath, sizeof(devpath), "/dev/press%d", devno);
       ret = bmp180_register(devpath, i2c);
       if (ret < 0)
         {
diff --git a/boards/risc-v/esp32c6/common/src/esp_board_bmp180.c b/boards/risc-v/esp32c6/common/src/esp_board_bmp180.c
index d6f3f3177a..b9327dedd3 100644
--- a/boards/risc-v/esp32c6/common/src/esp_board_bmp180.c
+++ b/boards/risc-v/esp32c6/common/src/esp_board_bmp180.c
@@ -70,7 +70,7 @@ int board_bmp180_initialize(int devno)
     {
       /* Then try to register the barometer sensor in I2C0 */
 
-      snprintf(devpath, 12, "/dev/press%d", devno);
+      snprintf(devpath, sizeof(devpath), "/dev/press%d", devno);
       ret = bmp180_register(devpath, i2c);
       if (ret < 0)
         {
diff --git a/boards/risc-v/esp32h2/common/src/esp_board_bmp180.c b/boards/risc-v/esp32h2/common/src/esp_board_bmp180.c
index 559a5d4458..616a65b237 100644
--- a/boards/risc-v/esp32h2/common/src/esp_board_bmp180.c
+++ b/boards/risc-v/esp32h2/common/src/esp_board_bmp180.c
@@ -69,7 +69,7 @@ int board_bmp180_initialize(int devno)
     {
       /* Then try to register the barometer sensor in I2C0 */
 
-      snprintf(devpath, 12, "/dev/press%d", devno);
+      snprintf(devpath, sizeof(devpath), "/dev/press%d", devno);
       ret = bmp180_register(devpath, i2c);
       if (ret < 0)
         {
diff --git a/boards/risc-v/litex/arty_a7/src/litex_pwm.c b/boards/risc-v/litex/arty_a7/src/litex_pwm.c
index df32534fbc..c61eb49f2e 100644
--- a/boards/risc-v/litex/arty_a7/src/litex_pwm.c
+++ b/boards/risc-v/litex/arty_a7/src/litex_pwm.c
@@ -60,10 +60,7 @@ int litex_pwm_setup(void)
   struct pwm_lowerhalf_s *pwm = NULL;
   int ret = OK;
   int channel;
-  char devpath[12] =
-    {
-        0
-    };
+  char devpath[12];
 
   for (channel = 0; channel < LITEX_PWM_MAX; channel++)
     {
@@ -76,7 +73,7 @@ int litex_pwm_setup(void)
 
       /* Register the PWM driver at "/dev/pwmX" */
 
-      snprintf(devpath, 12, "/dev/pwm%d", channel);
+      snprintf(devpath, sizeof(devpath), "/dev/pwm%d", channel);
       ret = pwm_register(devpath, pwm);
       if (ret < 0)
         {
diff --git a/boards/sim/sim/sim/src/sim_zoneinfo.c b/boards/sim/sim/sim/src/sim_zoneinfo.c
index ff33122e9b..a6dc4269cc 100644
--- a/boards/sim/sim/sim/src/sim_zoneinfo.c
+++ b/boards/sim/sim/sim/src/sim_zoneinfo.c
@@ -113,7 +113,7 @@ int sim_zoneinfo(int minor)
 
   /* Use the minor number to create a name for the ROM disk block device */
 
-  snprintf(devname, 32, "/dev/ram%d", minor);
+  snprintf(devname, sizeof(devname), "/dev/ram%d", minor);
 
   /* Mount the ROMFS file system */
 
diff --git a/boards/xtensa/esp32/common/src/esp32_bmp180.c b/boards/xtensa/esp32/common/src/esp32_bmp180.c
index 6cf195ab83..17822235b4 100644
--- a/boards/xtensa/esp32/common/src/esp32_bmp180.c
+++ b/boards/xtensa/esp32/common/src/esp32_bmp180.c
@@ -94,7 +94,7 @@ int board_bmp180_initialize(int devno, int busno)
     {
       /* Then try to register the barometer sensor in I2C0 */
 
-      snprintf(devpath, 12, "/dev/press%d", devno);
+      snprintf(devpath, sizeof(devpath), "/dev/press%d", devno);
       ret = bmp180_register(devpath, i2c);
       if (ret < 0)
         {
diff --git a/boards/xtensa/esp32/common/src/esp32_cs4344.c b/boards/xtensa/esp32/common/src/esp32_cs4344.c
index 76487cafe2..6fe6c5d485 100644
--- a/boards/xtensa/esp32/common/src/esp32_cs4344.c
+++ b/boards/xtensa/esp32/common/src/esp32_cs4344.c
@@ -137,7 +137,7 @@ int esp32_cs4344_initialize(int port)
 
       /* Create a device name */
 
-      snprintf(devname, 12, "pcm%d",  port);
+      snprintf(devname, sizeof(devname), "pcm%d",  port);
 
       /* Finally, we can register the PCM/CS4344/I2S audio device.
        *
diff --git a/boards/xtensa/esp32/common/src/esp32_lcd_backpack.c b/boards/xtensa/esp32/common/src/esp32_lcd_backpack.c
index 88d802084b..66d5d8a0f7 100644
--- a/boards/xtensa/esp32/common/src/esp32_lcd_backpack.c
+++ b/boards/xtensa/esp32/common/src/esp32_lcd_backpack.c
@@ -85,7 +85,7 @@ int board_lcd_backpack_init(int devno, int busno, int rows, int cols)
 
   /* Register the Segment LCD */
 
-  snprintf(devpath, 12, "/dev/slcd%d", devno);
+  snprintf(devpath, sizeof(devpath), "/dev/slcd%d", devno);
   ret = pcf8574_lcd_backpack_register(devpath, i2c, &cfg);
   if (ret < 0)
     {
diff --git a/boards/xtensa/esp32/common/src/esp32_mcp2515.c b/boards/xtensa/esp32/common/src/esp32_mcp2515.c
index ef4677301b..4ecef46241 100644
--- a/boards/xtensa/esp32/common/src/esp32_mcp2515.c
+++ b/boards/xtensa/esp32/common/src/esp32_mcp2515.c
@@ -242,7 +242,7 @@ int board_mcp2515_initialize(int devno)
 
       /* Create the '/dev/canX' name based on 'devno' */
 
-      snprintf(devpath, 10, "/dev/can%d", devno);
+      snprintf(devpath, sizeof(devpath), "/dev/can%d", devno);
 
       /* Register the CAN driver at "/dev/can0" */
 
diff --git a/boards/xtensa/esp32/common/src/esp32_sht3x.c b/boards/xtensa/esp32/common/src/esp32_sht3x.c
index 3656da7e87..0f10949b76 100644
--- a/boards/xtensa/esp32/common/src/esp32_sht3x.c
+++ b/boards/xtensa/esp32/common/src/esp32_sht3x.c
@@ -96,7 +96,7 @@ int board_sht3x_initialize(int devno, int busno)
     {
       /* Then try to register the sensor in I2C Bus */
 
-      snprintf(devpath, 12, "/dev/temp%d", devno);
+      snprintf(devpath, sizeof(devpath), "/dev/temp%d", devno);
       ret = sht3x_register(devpath, i2c, SHT3X_I2CADDR);
       if (ret < 0)
         {
diff --git a/boards/xtensa/esp32s2/common/src/esp32s2_cs4344.c b/boards/xtensa/esp32s2/common/src/esp32s2_cs4344.c
index 57f39a8f9b..ef314013b6 100644
--- a/boards/xtensa/esp32s2/common/src/esp32s2_cs4344.c
+++ b/boards/xtensa/esp32s2/common/src/esp32s2_cs4344.c
@@ -131,7 +131,7 @@ int esp32s2_cs4344_initialize(void)
 
       /* Create a device name */
 
-      snprintf(devname, 12, "pcm0");
+      snprintf(devname, sizeof(devname), "pcm0");
 
       /* Finally, we can register the PCM/CS4344/I2S audio device.
        *
diff --git a/boards/xtensa/esp32s3/common/src/esp32s3_board_adc.c b/boards/xtensa/esp32s3/common/src/esp32s3_board_adc.c
index 5093eca274..3d940064bf 100644
--- a/boards/xtensa/esp32s3/common/src/esp32s3_board_adc.c
+++ b/boards/xtensa/esp32s3/common/src/esp32s3_board_adc.c
@@ -70,7 +70,7 @@ static int board_adc_register(int channel)
 
   memset(adcdev, 0, sizeof(struct adc_dev_s));
   esp32s3_adc_init(channel, adcdev);
-  snprintf(devname, 12, "/dev/adc%d", channel);
+  snprintf(devname, sizeof(devname), "/dev/adc%d", channel);
 
   /* Register the ADC driver at "/dev/adcx_x" */
 
diff --git a/drivers/analog/hx711.c b/drivers/analog/hx711.c
index 089a780743..8fda40d568 100644
--- a/drivers/analog/hx711.c
+++ b/drivers/analog/hx711.c
@@ -946,7 +946,7 @@ int hx711_register(unsigned char minor, FAR struct hx711_lower_s *lower)
       return -ENOMEM;
     }
 
-  snprintf(devname, DEVNAME_FMTLEN, DEVNAME_FMT, minor);
+  snprintf(devname, sizeof(devname), DEVNAME_FMT, minor);
   ret = register_driver(devname, &g_hx711_fops, 0666, dev);
   if (ret)
     {
diff --git a/drivers/i2c/i2c_driver.c b/drivers/i2c/i2c_driver.c
index 1a78a64b2d..888a323caf 100644
--- a/drivers/i2c/i2c_driver.c
+++ b/drivers/i2c/i2c_driver.c
@@ -407,7 +407,7 @@ int i2c_register(FAR struct i2c_master_s *i2c, int bus)
 
       /* Create the character device name */
 
-      snprintf(devname, DEVNAME_FMTLEN, DEVNAME_FMT, bus);
+      snprintf(devname, sizeof(devname), DEVNAME_FMT, bus);
       ret = register_driver(devname, &g_i2cdrvr_fops, 0666, priv);
       if (ret < 0)
         {
diff --git a/drivers/i2c/i2c_slave_driver.c b/drivers/i2c/i2c_slave_driver.c
index 79ade78f6f..b71c1266cc 100644
--- a/drivers/i2c/i2c_slave_driver.c
+++ b/drivers/i2c/i2c_slave_driver.c
@@ -559,7 +559,7 @@ int i2c_slave_register(FAR struct i2c_slave_s *dev, int bus, int addr,
       return -ENOMEM;
     }
 
-  snprintf(devname, DEVNAME_FMTLEN, DEVNAME_FMT, bus);
+  snprintf(devname, sizeof(devname), DEVNAME_FMT, bus);
   ret = register_driver(devname, &g_i2cslavefops, 0666, priv);
   if (ret < 0)
     {
diff --git a/drivers/i2s/i2schar.c b/drivers/i2s/i2schar.c
index 5955706c90..67744668a4 100644
--- a/drivers/i2s/i2schar.c
+++ b/drivers/i2s/i2schar.c
@@ -419,7 +419,7 @@ int i2schar_register(FAR struct i2s_dev_s *i2s, int minor)
 
       /* Create the character device name */
 
-      snprintf(devname, DEVNAME_FMTLEN, DEVNAME_FMT, minor);
+      snprintf(devname, sizeof(devname), DEVNAME_FMT, minor);
       ret = register_driver(devname, &g_i2schar_fops, 0666, priv);
       if (ret < 0)
         {
diff --git a/drivers/ipcc/ipcc_register.c b/drivers/ipcc/ipcc_register.c
index d15564df12..46644f4b91 100644
--- a/drivers/ipcc/ipcc_register.c
+++ b/drivers/ipcc/ipcc_register.c
@@ -164,7 +164,7 @@ int ipcc_register(FAR struct ipcc_lower_s *ipcc)
 
   /* Create the character device name */
 
-  snprintf(devname, DEVNAME_FMTLEN, DEVNAME_FMT, ipcc->chan);
+  snprintf(devname, sizeof(devname), DEVNAME_FMT, ipcc->chan);
   if ((ret = register_driver(devname, &g_ipcc_fops, 0666, priv)))
     {
       goto error;
diff --git a/drivers/mmcsd/mmcsd_sdio.c b/drivers/mmcsd/mmcsd_sdio.c
index b966b9a2df..0e851023b5 100644
--- a/drivers/mmcsd/mmcsd_sdio.c
+++ b/drivers/mmcsd/mmcsd_sdio.c
@@ -4208,7 +4208,7 @@ int mmcsd_slotinitialize(int minor, FAR struct sdio_dev_s *dev)
 
   /* Create a MMCSD device name */
 
-  snprintf(devname, 16, "/dev/mmcsd%d", minor);
+  snprintf(devname, sizeof(devname), "/dev/mmcsd%d", minor);
 
   /* Inode private data is a reference to the MMCSD state structure */
 
diff --git a/drivers/mmcsd/mmcsd_spi.c b/drivers/mmcsd/mmcsd_spi.c
index fb911d5a63..8162c094b8 100644
--- a/drivers/mmcsd/mmcsd_spi.c
+++ b/drivers/mmcsd/mmcsd_spi.c
@@ -2074,7 +2074,7 @@ int mmcsd_spislotinitialize(int minor, int slotno, FAR struct spi_dev_s *spi)
 
   /* Create a MMC/SD device name */
 
-  snprintf(devname, 16, "/dev/mmcsd%d", minor);
+  snprintf(devname, sizeof(devname), "/dev/mmcsd%d", minor);
 
   /* Register the driver, even on a failure condition.  A
    * card may be inserted later, for example.
diff --git a/drivers/mtd/smart.c b/drivers/mtd/smart.c
index 5b3493acb6..97d0dc8cc0 100644
--- a/drivers/mtd/smart.c
+++ b/drivers/mtd/smart.c
@@ -3311,8 +3311,9 @@ static inline int smart_llformat(FAR struct smart_struct_s *dev,
 
   for (x = 2; x < 8; x++)
     {
-      snprintf(dev->rwbuffer, 18, "/dev/smart%dd%d", dev->minor, x);
-      unregister_blockdriver(dev->rwbuffer);
+      char devname[18];
+      snprintf(devname, sizeof(devname), "/dev/smart%dd%d", dev->minor, x);
+      unregister_blockdriver(devname);
     }
 #endif
 
@@ -6162,6 +6163,8 @@ int smart_initialize(int minor, FAR struct mtd_dev_s *mtd,
     smart_zalloc(NULL, sizeof(struct smart_struct_s), "Dev struct");
   if (dev)
     {
+      char devname[18];
+
       /* Initialize the SMART device structure */
 
       dev->mtd = mtd;
@@ -6241,11 +6244,12 @@ int smart_initialize(int minor, FAR struct mtd_dev_s *mtd,
 #ifdef CONFIG_SMARTFS_MULTI_ROOT_DIRS
       if (partname != NULL)
         {
-          snprintf(dev->rwbuffer, 18, "/dev/smart%d%sd1", minor, partname);
+          snprintf(devname, sizeof(devname), "/dev/smart%d%sd1", minor,
+                   partname);
         }
       else
         {
-          snprintf(dev->rwbuffer, 18, "/dev/smart%dd1", minor);
+          snprintf(devname, sizeof(devname), "/dev/smart%dd1", minor);
         }
 
       /* Inode private data is a reference to a struct containing
@@ -6265,21 +6269,22 @@ int smart_initialize(int minor, FAR struct mtd_dev_s *mtd,
 
       rootdirdev->dev = dev;
       rootdirdev->rootdirnum = 0;
-      ret = register_blockdriver(dev->rwbuffer, &g_bops, 0, rootdirdev);
+      ret = register_blockdriver(devname, &g_bops, 0, rootdirdev);
 
 #else
       if (partname != NULL)
         {
-          snprintf(dev->rwbuffer, 18, "/dev/smart%d%s", minor, partname);
+          snprintf(devname, sizeof(devname), "/dev/smart%d%s", minor,
+                   partname);
         }
       else
         {
-          snprintf(dev->rwbuffer, 18, "/dev/smart%d", minor);
+          snprintf(devname, sizeof(devname), "/dev/smart%d", minor);
         }
 
       /* Inode private data is a reference to the SMART device structure */
 
-      ret = register_blockdriver(dev->rwbuffer, &g_bops, 0, dev);
+      ret = register_blockdriver(devname, &g_bops, 0, dev);
 #endif
 
       if (ret < 0)
diff --git a/drivers/rmt/rmtchar.c b/drivers/rmt/rmtchar.c
index 2c22e8d1c0..bc0dad8591 100644
--- a/drivers/rmt/rmtchar.c
+++ b/drivers/rmt/rmtchar.c
@@ -317,7 +317,7 @@ int rmtchar_register(FAR struct rmt_dev_s *rmt)
 
       /* Create the character device name */
 
-      snprintf(devname, DEVNAME_FMTLEN, DEVNAME_FMT, priv->minor);
+      snprintf(devname, sizeof(devname), DEVNAME_FMT, priv->minor);
       ret = register_driver(devname, &g_rmt_channel_fops, 0666, priv);
       if (ret < 0)
         {
diff --git a/drivers/serial/pty.c b/drivers/serial/pty.c
index e9272cdb72..3c668bf38b 100644
--- a/drivers/serial/pty.c
+++ b/drivers/serial/pty.c
@@ -158,7 +158,7 @@ static void pty_destroy(FAR struct pty_devpair_s *devpair)
 
       /* Un-register the slave device */
 
-      snprintf(devname, 16, "/dev/pts/%d", devpair->pp_minor);
+      snprintf(devname, sizeof(devname), "/dev/pts/%u", devpair->pp_minor);
     }
   else
     {
@@ -166,12 +166,12 @@ static void pty_destroy(FAR struct pty_devpair_s *devpair)
        * unlinked).
        */
 
-      snprintf(devname, 16, "/dev/pty%d", (int)devpair->pp_minor);
+      snprintf(devname, sizeof(devname), "/dev/pty%u", devpair->pp_minor);
       unregister_driver(devname);
 
       /* Un-register the slave device */
 
-      snprintf(devname, 16, "/dev/ttyp%d", devpair->pp_minor);
+      snprintf(devname, sizeof(devname), "/dev/ttyp%u", devpair->pp_minor);
     }
 
   unregister_driver(devname);
@@ -1026,7 +1026,7 @@ int pty_register2(int minor, bool susv1)
    * Where N is the minor number
    */
 
-  snprintf(devname, 16, "/dev/pty%d", minor);
+  snprintf(devname, sizeof(devname), "/dev/pty%d", minor);
 
   ret = register_driver(devname, &g_pty_fops, 0666, &devpair->pp_master);
   if (ret < 0)
@@ -1044,11 +1044,11 @@ int pty_register2(int minor, bool susv1)
 
   if (susv1)
     {
-      snprintf(devname, 16, "/dev/pts/%d", minor);
+      snprintf(devname, sizeof(devname), "/dev/pts/%d", minor);
     }
   else
     {
-      snprintf(devname, 16, "/dev/ttyp%d", minor);
+      snprintf(devname, sizeof(devname), "/dev/ttyp%d", minor);
     }
 
   ret = register_driver(devname, &g_pty_fops, 0666, &devpair->pp_slave);
@@ -1060,7 +1060,7 @@ int pty_register2(int minor, bool susv1)
   return OK;
 
 errout_with_master:
-  snprintf(devname, 16, "/dev/pty%d", minor);
+  snprintf(devname, sizeof(devname), "/dev/pty%d", minor);
   unregister_driver(devname);
 
 errout_with_devpair:
diff --git a/drivers/spi/spi_driver.c b/drivers/spi/spi_driver.c
index 0774dcd956..c5e49852f6 100644
--- a/drivers/spi/spi_driver.c
+++ b/drivers/spi/spi_driver.c
@@ -369,7 +369,7 @@ int spi_register(FAR struct spi_dev_s *spi, int bus)
 
       /* Create the character device name */
 
-      snprintf(devname, DEVNAME_FMTLEN, DEVNAME_FMT, bus);
+      snprintf(devname, sizeof(devname), DEVNAME_FMT, bus);
       ret = register_driver(devname, &g_spidrvr_fops, 0666, priv);
       if (ret < 0)
         {
diff --git a/drivers/usbdev/cdcacm.c b/drivers/usbdev/cdcacm.c
index 31a8d868a8..c3057f7a90 100644
--- a/drivers/usbdev/cdcacm.c
+++ b/drivers/usbdev/cdcacm.c
@@ -2956,7 +2956,7 @@ int cdcacm_classobject(int minor, FAR struct usbdev_devinfo_s *devinfo,
 
   /* Register the CDC/ACM TTY device */
 
-  snprintf(devname, CDCACM_DEVNAME_SIZE, CDCACM_DEVNAME_FORMAT, minor);
+  snprintf(devname, sizeof(devname), CDCACM_DEVNAME_FORMAT, minor);
   ret = uart_register(devname, &priv->serdev);
   if (ret < 0)
     {
@@ -3087,7 +3087,7 @@ void cdcacm_uninitialize(FAR struct usbdevclass_driver_s *classdev)
 
   /* Un-register the CDC/ACM TTY device */
 
-  snprintf(devname, CDCACM_DEVNAME_SIZE, CDCACM_DEVNAME_FORMAT, priv->minor);
+  snprintf(devname, sizeof(devname), CDCACM_DEVNAME_FORMAT, priv->minor);
   ret = unregister_driver(devname);
   if (ret < 0)
     {
diff --git a/drivers/usbdev/cdcncm.c b/drivers/usbdev/cdcncm.c
index fbae55590e..cf7974bd16 100644
--- a/drivers/usbdev/cdcncm.c
+++ b/drivers/usbdev/cdcncm.c
@@ -2901,7 +2901,7 @@ static int cdcmbim_classobject(int minor,
 #ifdef CONFIG_NETDEV_IFINDEX
       index = self->ncmdriver.dev.netdev.d_ifindex;
 #endif
-      snprintf(devname, CDC_MBIM_DEVNAMELEN, CDC_MBIM_DEVFORMAT, index);
+      snprintf(devname, sizeof(devname), CDC_MBIM_DEVFORMAT, index);
       ret = register_driver(devname, &g_usbdevfops, 0666, self);
       if (ret < 0)
         {
diff --git a/drivers/video/fb.c b/drivers/video/fb.c
index f2a8223126..01e648104c 100644
--- a/drivers/video/fb.c
+++ b/drivers/video/fb.c
@@ -1645,11 +1645,11 @@ int fb_register_device(int display, int plane,
 
   if (nplanes < 2)
     {
-      snprintf(devname, 16, "/dev/fb%d", display);
+      snprintf(devname, sizeof(devname), "/dev/fb%d", display);
     }
   else
     {
-      snprintf(devname, 16, "/dev/fb%d.%d", display, plane);
+      snprintf(devname, sizeof(devname), "/dev/fb%d.%d", display, plane);
     }
 
   ret = register_driver(devname, &g_fb_fops, 0666, fb);
diff --git a/drivers/virtio/virtio-snd.c b/drivers/virtio/virtio-snd.c
index 210c9a4979..1bbac2e3e0 100644
--- a/drivers/virtio/virtio-snd.c
+++ b/drivers/virtio/virtio-snd.c
@@ -1141,11 +1141,11 @@ virtio_snd_register_audio_driver(FAR struct virtio_snd_s *priv)
       switch (priv->info[i].direction)
         {
           case VIRTIO_SND_D_OUTPUT:
-            snprintf(devname, 32, "pcm%dp", tx_minor++);
+            snprintf(devname, sizeof(devname), "pcm%dp", tx_minor++);
             break;
 
           case VIRTIO_SND_D_INPUT:
-            snprintf(devname, 32, "pcm%dc", rx_minor++);
+            snprintf(devname, sizeof(devname), "pcm%dc", rx_minor++);
             break;
         }
 
diff --git a/fs/driver/fs_blockproxy.c b/fs/driver/fs_blockproxy.c
index 0aafca530a..29dcfa9531 100644
--- a/fs/driver/fs_blockproxy.c
+++ b/fs/driver/fs_blockproxy.c
@@ -103,7 +103,8 @@ static FAR char *unique_chardev(void)
       /* Construct the full device number */
 
       devno &= 0xffffff;
-      snprintf(devbuf, 16, "/dev/tmpc%06lx", (unsigned long)devno);
+      snprintf(devbuf, sizeof(devbuf), "/dev/tmpc%06lx",
+               (unsigned long)devno);
 
       /* Make sure that file name is not in use */
 
diff --git a/fs/driver/fs_mtdproxy.c b/fs/driver/fs_mtdproxy.c
index 4a73568ad1..72e83a7530 100644
--- a/fs/driver/fs_mtdproxy.c
+++ b/fs/driver/fs_mtdproxy.c
@@ -96,7 +96,8 @@ static FAR char *unique_blkdev(void)
       /* Construct the full device number */
 
       devno &= 0xffffff;
-      snprintf(devbuf, 16, "/dev/tmpb%06lx", (unsigned long)devno);
+      snprintf(devbuf, sizeof(devbuf), "/dev/tmpb%06lx",
+               (unsigned long)devno);
 
       /* Make sure that file name is not in use */
 
diff --git a/graphics/nxterm/nxterm_unregister.c b/graphics/nxterm/nxterm_unregister.c
index 73551e9fbf..7b790f3ec3 100644
--- a/graphics/nxterm/nxterm_unregister.c
+++ b/graphics/nxterm/nxterm_unregister.c
@@ -75,7 +75,7 @@ void nxterm_unregister(FAR struct nxterm_state_s *priv)
 
   /* Unregister the driver */
 
-  snprintf(devname, NX_DEVNAME_SIZE, NX_DEVNAME_FORMAT, priv->minor);
+  snprintf(devname, sizeof(devname), NX_DEVNAME_FORMAT, priv->minor);
   unregister_driver(devname);
 
   /* Free the private data structure */
diff --git a/libs/libc/stdlib/lib_openpty.c b/libs/libc/stdlib/lib_openpty.c
index 47db4128a0..6e8056108d 100644
--- a/libs/libc/stdlib/lib_openpty.c
+++ b/libs/libc/stdlib/lib_openpty.c
@@ -78,7 +78,7 @@ int posix_openpt(int oflag)
       char devname[16];
       int fd;
 
-      snprintf(devname, 16, "/dev/pty%d", minor);
+      snprintf(devname, sizeof(devname), "/dev/pty%d", minor);
       fd = open(devname, oflag);
       if (fd < 0)
         {
diff --git a/wireless/ieee802154/mac802154_device.c b/wireless/ieee802154/mac802154_device.c
index 758087940d..536c14a399 100644
--- a/wireless/ieee802154/mac802154_device.c
+++ b/wireless/ieee802154/mac802154_device.c
@@ -855,7 +855,7 @@ int mac802154dev_register(MACHANDLE mac, int minor)
 
   /* Create the character device name */
 
-  snprintf(devname, DEVNAME_FMTLEN, DEVNAME_FMT, minor);
+  snprintf(devname, sizeof(devname), DEVNAME_FMT, minor);
 
   /* Register the mac character driver */