diff --git a/library/entropy_poll.c b/library/entropy_poll.c
index a858c18..3420616 100644
--- a/library/entropy_poll.c
+++ b/library/entropy_poll.c
@@ -45,7 +45,8 @@
 #if !defined(unix) && !defined(__unix__) && !defined(__unix) && \
     !defined(__APPLE__) && !defined(_WIN32) && !defined(__QNXNTO__) && \
     !defined(__HAIKU__) && !defined(__midipix__)
-#error "Platform entropy sources only work on Unix and Windows, see MBEDTLS_NO_PLATFORM_ENTROPY in config.h"
+#error \
+    "Platform entropy sources only work on Unix and Windows, see MBEDTLS_NO_PLATFORM_ENTROPY in config.h"
 #endif
 
 #if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
@@ -56,29 +57,27 @@
 #include <windows.h>
 #include <wincrypt.h>
 
-int mbedtls_platform_entropy_poll( void *data, unsigned char *output, size_t len,
-                           size_t *olen )
+int mbedtls_platform_entropy_poll(void *data, unsigned char *output, size_t len,
+                                  size_t *olen)
 {
     HCRYPTPROV provider;
     ((void) data);
     *olen = 0;
 
-    if( CryptAcquireContext( &provider, NULL, NULL,
-                              PROV_RSA_FULL, CRYPT_VERIFYCONTEXT ) == FALSE )
-    {
-        return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
+    if (CryptAcquireContext(&provider, NULL, NULL,
+                            PROV_RSA_FULL, CRYPT_VERIFYCONTEXT) == FALSE) {
+        return MBEDTLS_ERR_ENTROPY_SOURCE_FAILED;
     }
 
-    if( CryptGenRandom( provider, (DWORD) len, output ) == FALSE )
-    {
-        CryptReleaseContext( provider, 0 );
-        return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
+    if (CryptGenRandom(provider, (DWORD) len, output) == FALSE) {
+        CryptReleaseContext(provider, 0);
+        return MBEDTLS_ERR_ENTROPY_SOURCE_FAILED;
     }
 
-    CryptReleaseContext( provider, 0 );
+    CryptReleaseContext(provider, 0);
     *olen = len;
 
-    return( 0 );
+    return 0;
 }
 #else /* _WIN32 && !EFIX64 && !EFI32 */
 
@@ -94,15 +93,15 @@
 #define HAVE_GETRANDOM
 #include <errno.h>
 
-static int getrandom_wrapper( void *buf, size_t buflen, unsigned int flags )
+static int getrandom_wrapper(void *buf, size_t buflen, unsigned int flags)
 {
     /* MemSan cannot understand that the syscall writes to the buffer */
 #if defined(__has_feature)
 #if __has_feature(memory_sanitizer)
-    memset( buf, 0, buflen );
+    memset(buf, 0, buflen);
 #endif
 #endif
-    return( syscall( SYS_getrandom, buf, buflen, flags ) );
+    return syscall(SYS_getrandom, buf, buflen, flags);
 }
 #endif /* SYS_getrandom */
 #endif /* __linux__ || __midipix__ */
@@ -114,9 +113,9 @@
 #include <errno.h>
 #include <sys/random.h>
 #define HAVE_GETRANDOM
-static int getrandom_wrapper( void *buf, size_t buflen, unsigned int flags )
+static int getrandom_wrapper(void *buf, size_t buflen, unsigned int flags)
 {
-    return getrandom( buf, buflen, flags );
+    return getrandom(buf, buflen, flags);
 }
 #endif /* (__FreeBSD__ && __FreeBSD_version >= 1200000) ||
           (__DragonFly__ && __DragonFly_version >= 500700) */
@@ -136,7 +135,7 @@
 #if defined(KERN_ARND)
 #define HAVE_SYSCTL_ARND
 
-static int sysctl_arnd_wrapper( unsigned char *buf, size_t buflen )
+static int sysctl_arnd_wrapper(unsigned char *buf, size_t buflen)
 {
     int name[2];
     size_t len;
@@ -144,23 +143,23 @@
     name[0] = CTL_KERN;
     name[1] = KERN_ARND;
 
-    while( buflen > 0 )
-    {
+    while (buflen > 0) {
         len = buflen > 256 ? 256 : buflen;
-        if( sysctl(name, 2, buf, &len, NULL, 0) == -1 )
-            return( -1 );
+        if (sysctl(name, 2, buf, &len, NULL, 0) == -1) {
+            return -1;
+        }
         buflen -= len;
         buf += len;
     }
-    return( 0 );
+    return 0;
 }
 #endif /* KERN_ARND */
 #endif /* __FreeBSD__ || __NetBSD__ */
 
 #include <stdio.h>
 
-int mbedtls_platform_entropy_poll( void *data,
-                           unsigned char *output, size_t len, size_t *olen )
+int mbedtls_platform_entropy_poll(void *data,
+                                  unsigned char *output, size_t len, size_t *olen)
 {
     FILE *file;
     size_t read_len;
@@ -168,14 +167,13 @@
     ((void) data);
 
 #if defined(HAVE_GETRANDOM)
-    ret = getrandom_wrapper( output, len, 0 );
-    if( ret >= 0 )
-    {
+    ret = getrandom_wrapper(output, len, 0);
+    if (ret >= 0) {
         *olen = ret;
-        return( 0 );
+        return 0;
+    } else if (errno != ENOSYS) {
+        return MBEDTLS_ERR_ENTROPY_SOURCE_FAILED;
     }
-    else if( errno != ENOSYS )
-        return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
     /* Fall through if the system call isn't known. */
 #else
     ((void) ret);
@@ -184,105 +182,111 @@
 #if defined(HAVE_SYSCTL_ARND)
     ((void) file);
     ((void) read_len);
-    if( sysctl_arnd_wrapper( output, len ) == -1 )
-        return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
+    if (sysctl_arnd_wrapper(output, len) == -1) {
+        return MBEDTLS_ERR_ENTROPY_SOURCE_FAILED;
+    }
     *olen = len;
-    return( 0 );
+    return 0;
 #else
 
     *olen = 0;
 
-    file = fopen( "/dev/urandom", "rb" );
-    if( file == NULL )
-        return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
-
-    read_len = fread( output, 1, len, file );
-    if( read_len != len )
-    {
-        fclose( file );
-        return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
+    file = fopen("/dev/urandom", "rb");
+    if (file == NULL) {
+        return MBEDTLS_ERR_ENTROPY_SOURCE_FAILED;
     }
 
-    fclose( file );
+    read_len = fread(output, 1, len, file);
+    if (read_len != len) {
+        fclose(file);
+        return MBEDTLS_ERR_ENTROPY_SOURCE_FAILED;
+    }
+
+    fclose(file);
     *olen = len;
 
-    return( 0 );
+    return 0;
 #endif /* HAVE_SYSCTL_ARND */
 }
 #endif /* _WIN32 && !EFIX64 && !EFI32 */
 #endif /* !MBEDTLS_NO_PLATFORM_ENTROPY */
 
 #if defined(MBEDTLS_TEST_NULL_ENTROPY)
-int mbedtls_null_entropy_poll( void *data,
-                    unsigned char *output, size_t len, size_t *olen )
+int mbedtls_null_entropy_poll(void *data,
+                              unsigned char *output, size_t len, size_t *olen)
 {
     ((void) data);
     ((void) output);
 
     *olen = 0;
-    if( len < sizeof(unsigned char) )
-        return( 0 );
+    if (len < sizeof(unsigned char)) {
+        return 0;
+    }
 
     output[0] = 0;
     *olen = sizeof(unsigned char);
-    return( 0 );
+    return 0;
 }
 #endif
 
 #if defined(MBEDTLS_TIMING_C)
-int mbedtls_hardclock_poll( void *data,
-                    unsigned char *output, size_t len, size_t *olen )
+int mbedtls_hardclock_poll(void *data,
+                           unsigned char *output, size_t len, size_t *olen)
 {
     unsigned long timer = mbedtls_timing_hardclock();
     ((void) data);
     *olen = 0;
 
-    if( len < sizeof(unsigned long) )
-        return( 0 );
+    if (len < sizeof(unsigned long)) {
+        return 0;
+    }
 
-    memcpy( output, &timer, sizeof(unsigned long) );
+    memcpy(output, &timer, sizeof(unsigned long));
     *olen = sizeof(unsigned long);
 
-    return( 0 );
+    return 0;
 }
 #endif /* MBEDTLS_TIMING_C */
 
 #if defined(MBEDTLS_HAVEGE_C)
-int mbedtls_havege_poll( void *data,
-                 unsigned char *output, size_t len, size_t *olen )
+int mbedtls_havege_poll(void *data,
+                        unsigned char *output, size_t len, size_t *olen)
 {
     mbedtls_havege_state *hs = (mbedtls_havege_state *) data;
     *olen = 0;
 
-    if( mbedtls_havege_random( hs, output, len ) != 0 )
-        return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
+    if (mbedtls_havege_random(hs, output, len) != 0) {
+        return MBEDTLS_ERR_ENTROPY_SOURCE_FAILED;
+    }
 
     *olen = len;
 
-    return( 0 );
+    return 0;
 }
 #endif /* MBEDTLS_HAVEGE_C */
 
 #if defined(MBEDTLS_ENTROPY_NV_SEED)
-int mbedtls_nv_seed_poll( void *data,
-                          unsigned char *output, size_t len, size_t *olen )
+int mbedtls_nv_seed_poll(void *data,
+                         unsigned char *output, size_t len, size_t *olen)
 {
     unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE];
     size_t use_len = MBEDTLS_ENTROPY_BLOCK_SIZE;
     ((void) data);
 
-    memset( buf, 0, MBEDTLS_ENTROPY_BLOCK_SIZE );
+    memset(buf, 0, MBEDTLS_ENTROPY_BLOCK_SIZE);
 
-    if( mbedtls_nv_seed_read( buf, MBEDTLS_ENTROPY_BLOCK_SIZE ) < 0 )
-      return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
+    if (mbedtls_nv_seed_read(buf, MBEDTLS_ENTROPY_BLOCK_SIZE) < 0) {
+        return MBEDTLS_ERR_ENTROPY_SOURCE_FAILED;
+    }
 
-    if( len < use_len )
-      use_len = len;
+    if (len < use_len) {
+        use_len = len;
+    }
 
-    memcpy( output, buf, use_len );
+    memcpy(output, buf, use_len);
     *olen = use_len;
 
-    return( 0 );
+    return 0;
 }
 #endif /* MBEDTLS_ENTROPY_NV_SEED */