Apply clang formatting.

Executed with:
`find . -regextype posix-egrep -regex ".*\.([hc]|fmt|function)" | xargs -L1 clang-format-12 -i`

Signed-off-by: Mateusz Starzyk <mateusz.starzyk@mobica.com>
diff --git a/programs/x509/cert_req.c b/programs/x509/cert_req.c
index 03dbd20..29962b8 100644
--- a/programs/x509/cert_req.c
+++ b/programs/x509/cert_req.c
@@ -20,134 +20,133 @@
 #include "mbedtls/build_info.h"
 
 #if defined(MBEDTLS_PLATFORM_C)
-#include "mbedtls/platform.h"
+#    include "mbedtls/platform.h"
 #else
-#include <stdio.h>
-#include <stdlib.h>
-#define mbedtls_printf          printf
-#define mbedtls_exit            exit
-#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
-#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#    include <stdio.h>
+#    include <stdlib.h>
+#    define mbedtls_printf       printf
+#    define mbedtls_exit         exit
+#    define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
+#    define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
 #endif /* MBEDTLS_PLATFORM_C */
 
-#if !defined(MBEDTLS_X509_CSR_WRITE_C) || !defined(MBEDTLS_FS_IO) ||  \
-    !defined(MBEDTLS_PK_PARSE_C) || !defined(MBEDTLS_SHA256_C) || \
-    !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_CTR_DRBG_C) || \
+#if !defined(MBEDTLS_X509_CSR_WRITE_C) || !defined(MBEDTLS_FS_IO) || \
+    !defined(MBEDTLS_PK_PARSE_C) || !defined(MBEDTLS_SHA256_C) ||    \
+    !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_CTR_DRBG_C) ||   \
     !defined(MBEDTLS_PEM_WRITE_C)
-int main( void )
+int main(void)
 {
-    mbedtls_printf( "MBEDTLS_X509_CSR_WRITE_C and/or MBEDTLS_FS_IO and/or "
-            "MBEDTLS_PK_PARSE_C and/or MBEDTLS_SHA256_C and/or "
-            "MBEDTLS_ENTROPY_C and/or MBEDTLS_CTR_DRBG_C "
-            "not defined.\n");
-    mbedtls_exit( 0 );
+    mbedtls_printf("MBEDTLS_X509_CSR_WRITE_C and/or MBEDTLS_FS_IO and/or "
+                   "MBEDTLS_PK_PARSE_C and/or MBEDTLS_SHA256_C and/or "
+                   "MBEDTLS_ENTROPY_C and/or MBEDTLS_CTR_DRBG_C "
+                   "not defined.\n");
+    mbedtls_exit(0);
 }
 #else
 
-#include "mbedtls/x509_csr.h"
-#include "mbedtls/entropy.h"
-#include "mbedtls/ctr_drbg.h"
-#include "mbedtls/error.h"
+#    include "mbedtls/x509_csr.h"
+#    include "mbedtls/entropy.h"
+#    include "mbedtls/ctr_drbg.h"
+#    include "mbedtls/error.h"
 
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
+#    include <stdio.h>
+#    include <stdlib.h>
+#    include <string.h>
 
-#define DFL_FILENAME            "keyfile.key"
-#define DFL_PASSWORD            NULL
-#define DFL_DEBUG_LEVEL         0
-#define DFL_OUTPUT_FILENAME     "cert.req"
-#define DFL_SUBJECT_NAME        "CN=Cert,O=mbed TLS,C=UK"
-#define DFL_KEY_USAGE           0
-#define DFL_FORCE_KEY_USAGE     0
-#define DFL_NS_CERT_TYPE        0
-#define DFL_FORCE_NS_CERT_TYPE  0
-#define DFL_MD_ALG              MBEDTLS_MD_SHA256
+#    define DFL_FILENAME           "keyfile.key"
+#    define DFL_PASSWORD           NULL
+#    define DFL_DEBUG_LEVEL        0
+#    define DFL_OUTPUT_FILENAME    "cert.req"
+#    define DFL_SUBJECT_NAME       "CN=Cert,O=mbed TLS,C=UK"
+#    define DFL_KEY_USAGE          0
+#    define DFL_FORCE_KEY_USAGE    0
+#    define DFL_NS_CERT_TYPE       0
+#    define DFL_FORCE_NS_CERT_TYPE 0
+#    define DFL_MD_ALG             MBEDTLS_MD_SHA256
 
-#define USAGE \
-    "\n usage: cert_req param=<>...\n"                  \
-    "\n acceptable parameters:\n"                       \
-    "    filename=%%s         default: keyfile.key\n"   \
-    "    password=%%s         default: NULL\n"          \
-    "    debug_level=%%d      default: 0 (disabled)\n"  \
-    "    output_file=%%s      default: cert.req\n"      \
-    "    subject_name=%%s     default: CN=Cert,O=mbed TLS,C=UK\n"   \
-    "    key_usage=%%s        default: (empty)\n"       \
-    "                        Comma-separated-list of values:\n"     \
-    "                          digital_signature\n"     \
-    "                          non_repudiation\n"       \
-    "                          key_encipherment\n"      \
-    "                          data_encipherment\n"     \
-    "                          key_agreement\n"         \
-    "                          key_cert_sign\n"  \
-    "                          crl_sign\n"              \
-    "    force_key_usage=0/1  default: off\n"           \
-    "                          Add KeyUsage even if it is empty\n"  \
-    "    ns_cert_type=%%s     default: (empty)\n"       \
-    "                        Comma-separated-list of values:\n"     \
-    "                          ssl_client\n"            \
-    "                          ssl_server\n"            \
-    "                          email\n"                 \
-    "                          object_signing\n"        \
-    "                          ssl_ca\n"                \
-    "                          email_ca\n"              \
-    "                          object_signing_ca\n"     \
-    "    force_ns_cert_type=0/1 default: off\n"         \
-    "                          Add NsCertType even if it is empty\n"    \
-    "    md=%%s               default: SHA256\n"       \
-    "                          possible values:\n"     \
-    "                          MD5, RIPEMD160, SHA1,\n" \
-    "                          SHA224, SHA256, SHA384, SHA512\n" \
-    "\n"
-
+#    define USAGE                                                        \
+        "\n usage: cert_req param=<>...\n"                               \
+        "\n acceptable parameters:\n"                                    \
+        "    filename=%%s         default: keyfile.key\n"                \
+        "    password=%%s         default: NULL\n"                       \
+        "    debug_level=%%d      default: 0 (disabled)\n"               \
+        "    output_file=%%s      default: cert.req\n"                   \
+        "    subject_name=%%s     default: CN=Cert,O=mbed TLS,C=UK\n"    \
+        "    key_usage=%%s        default: (empty)\n"                    \
+        "                        Comma-separated-list of values:\n"      \
+        "                          digital_signature\n"                  \
+        "                          non_repudiation\n"                    \
+        "                          key_encipherment\n"                   \
+        "                          data_encipherment\n"                  \
+        "                          key_agreement\n"                      \
+        "                          key_cert_sign\n"                      \
+        "                          crl_sign\n"                           \
+        "    force_key_usage=0/1  default: off\n"                        \
+        "                          Add KeyUsage even if it is empty\n"   \
+        "    ns_cert_type=%%s     default: (empty)\n"                    \
+        "                        Comma-separated-list of values:\n"      \
+        "                          ssl_client\n"                         \
+        "                          ssl_server\n"                         \
+        "                          email\n"                              \
+        "                          object_signing\n"                     \
+        "                          ssl_ca\n"                             \
+        "                          email_ca\n"                           \
+        "                          object_signing_ca\n"                  \
+        "    force_ns_cert_type=0/1 default: off\n"                      \
+        "                          Add NsCertType even if it is empty\n" \
+        "    md=%%s               default: SHA256\n"                     \
+        "                          possible values:\n"                   \
+        "                          MD5, RIPEMD160, SHA1,\n"              \
+        "                          SHA224, SHA256, SHA384, SHA512\n"     \
+        "\n"
 
 /*
  * global options
  */
-struct options
-{
-    const char *filename;       /* filename of the key file             */
-    const char *password;       /* password for the key file            */
-    int debug_level;            /* level of debugging                   */
-    const char *output_file;    /* where to store the constructed key file  */
-    const char *subject_name;   /* subject name for certificate request */
-    unsigned char key_usage;    /* key usage flags                      */
-    int force_key_usage;        /* Force adding the KeyUsage extension  */
+struct options {
+    const char *filename; /* filename of the key file             */
+    const char *password; /* password for the key file            */
+    int debug_level; /* level of debugging                   */
+    const char *output_file; /* where to store the constructed key file  */
+    const char *subject_name; /* subject name for certificate request */
+    unsigned char key_usage; /* key usage flags                      */
+    int force_key_usage; /* Force adding the KeyUsage extension  */
     unsigned char ns_cert_type; /* NS cert type                         */
-    int force_ns_cert_type;     /* Force adding NsCertType extension    */
-    mbedtls_md_type_t md_alg;   /* Hash algorithm used for signature.   */
+    int force_ns_cert_type; /* Force adding NsCertType extension    */
+    mbedtls_md_type_t md_alg; /* Hash algorithm used for signature.   */
 } opt;
 
-int write_certificate_request( mbedtls_x509write_csr *req, const char *output_file,
-                               int (*f_rng)(void *, unsigned char *, size_t),
-                               void *p_rng )
+int write_certificate_request(mbedtls_x509write_csr *req,
+                              const char *output_file,
+                              int (*f_rng)(void *, unsigned char *, size_t),
+                              void *p_rng)
 {
     int ret;
     FILE *f;
     unsigned char output_buf[4096];
     size_t len = 0;
 
-    memset( output_buf, 0, 4096 );
-    if( ( ret = mbedtls_x509write_csr_pem( req, output_buf, 4096, f_rng, p_rng ) ) < 0 )
-        return ret ;
+    memset(output_buf, 0, 4096);
+    if ((ret = mbedtls_x509write_csr_pem(req, output_buf, 4096, f_rng, p_rng)) <
+        0)
+        return ret;
 
-    len = strlen( (char *) output_buf );
+    len = strlen((char *)output_buf);
 
-    if( ( f = fopen( output_file, "w" ) ) == NULL )
-        return -1 ;
+    if ((f = fopen(output_file, "w")) == NULL)
+        return -1;
 
-    if( fwrite( output_buf, 1, len, f ) != len )
-    {
-        fclose( f );
-        return -1 ;
+    if (fwrite(output_buf, 1, len, f) != len) {
+        fclose(f);
+        return -1;
     }
 
-    fclose( f );
+    fclose(f);
 
-    return 0 ;
+    return 0;
 }
 
-int main( int argc, char *argv[] )
+int main(int argc, char *argv[])
 {
     int ret = 1;
     int exit_code = MBEDTLS_EXIT_FAILURE;
@@ -163,238 +162,227 @@
     /*
      * Set to sane values
      */
-    mbedtls_x509write_csr_init( &req );
-    mbedtls_pk_init( &key );
-    mbedtls_ctr_drbg_init( &ctr_drbg );
-    memset( buf, 0, sizeof( buf ) );
+    mbedtls_x509write_csr_init(&req);
+    mbedtls_pk_init(&key);
+    mbedtls_ctr_drbg_init(&ctr_drbg);
+    memset(buf, 0, sizeof(buf));
 
-    if( argc == 0 )
-    {
-    usage:
-        mbedtls_printf( USAGE );
+    if (argc == 0) {
+usage:
+        mbedtls_printf(USAGE);
         goto exit;
     }
 
-    opt.filename            = DFL_FILENAME;
-    opt.password            = DFL_PASSWORD;
-    opt.debug_level         = DFL_DEBUG_LEVEL;
-    opt.output_file         = DFL_OUTPUT_FILENAME;
-    opt.subject_name        = DFL_SUBJECT_NAME;
-    opt.key_usage           = DFL_KEY_USAGE;
-    opt.force_key_usage     = DFL_FORCE_KEY_USAGE;
-    opt.ns_cert_type        = DFL_NS_CERT_TYPE;
-    opt.force_ns_cert_type  = DFL_FORCE_NS_CERT_TYPE;
-    opt.md_alg              = DFL_MD_ALG;
+    opt.filename = DFL_FILENAME;
+    opt.password = DFL_PASSWORD;
+    opt.debug_level = DFL_DEBUG_LEVEL;
+    opt.output_file = DFL_OUTPUT_FILENAME;
+    opt.subject_name = DFL_SUBJECT_NAME;
+    opt.key_usage = DFL_KEY_USAGE;
+    opt.force_key_usage = DFL_FORCE_KEY_USAGE;
+    opt.ns_cert_type = DFL_NS_CERT_TYPE;
+    opt.force_ns_cert_type = DFL_FORCE_NS_CERT_TYPE;
+    opt.md_alg = DFL_MD_ALG;
 
-    for( i = 1; i < argc; i++ )
-    {
-
+    for (i = 1; i < argc; i++) {
         p = argv[i];
-        if( ( q = strchr( p, '=' ) ) == NULL )
+        if ((q = strchr(p, '=')) == NULL)
             goto usage;
         *q++ = '\0';
 
-        if( strcmp( p, "filename" ) == 0 )
+        if (strcmp(p, "filename") == 0)
             opt.filename = q;
-        else if( strcmp( p, "password" ) == 0 )
+        else if (strcmp(p, "password") == 0)
             opt.password = q;
-        else if( strcmp( p, "output_file" ) == 0 )
+        else if (strcmp(p, "output_file") == 0)
             opt.output_file = q;
-        else if( strcmp( p, "debug_level" ) == 0 )
-        {
-            opt.debug_level = atoi( q );
-            if( opt.debug_level < 0 || opt.debug_level > 65535 )
+        else if (strcmp(p, "debug_level") == 0) {
+            opt.debug_level = atoi(q);
+            if (opt.debug_level < 0 || opt.debug_level > 65535)
                 goto usage;
-        }
-        else if( strcmp( p, "subject_name" ) == 0 )
-        {
+        } else if (strcmp(p, "subject_name") == 0) {
             opt.subject_name = q;
-        }
-        else if( strcmp( p, "md" ) == 0 )
-        {
-            const mbedtls_md_info_t *md_info =
-                mbedtls_md_info_from_string( q );
-            if( md_info == NULL )
-            {
-                mbedtls_printf( "Invalid argument for option %s\n", p );
+        } else if (strcmp(p, "md") == 0) {
+            const mbedtls_md_info_t *md_info = mbedtls_md_info_from_string(q);
+            if (md_info == NULL) {
+                mbedtls_printf("Invalid argument for option %s\n", p);
                 goto usage;
             }
-            opt.md_alg = mbedtls_md_get_type( md_info );
-        }
-        else if( strcmp( p, "key_usage" ) == 0 )
-        {
-            while( q != NULL )
-            {
-                if( ( r = strchr( q, ',' ) ) != NULL )
+            opt.md_alg = mbedtls_md_get_type(md_info);
+        } else if (strcmp(p, "key_usage") == 0) {
+            while (q != NULL) {
+                if ((r = strchr(q, ',')) != NULL)
                     *r++ = '\0';
 
-                if( strcmp( q, "digital_signature" ) == 0 )
+                if (strcmp(q, "digital_signature") == 0)
                     opt.key_usage |= MBEDTLS_X509_KU_DIGITAL_SIGNATURE;
-                else if( strcmp( q, "non_repudiation" ) == 0 )
+                else if (strcmp(q, "non_repudiation") == 0)
                     opt.key_usage |= MBEDTLS_X509_KU_NON_REPUDIATION;
-                else if( strcmp( q, "key_encipherment" ) == 0 )
+                else if (strcmp(q, "key_encipherment") == 0)
                     opt.key_usage |= MBEDTLS_X509_KU_KEY_ENCIPHERMENT;
-                else if( strcmp( q, "data_encipherment" ) == 0 )
+                else if (strcmp(q, "data_encipherment") == 0)
                     opt.key_usage |= MBEDTLS_X509_KU_DATA_ENCIPHERMENT;
-                else if( strcmp( q, "key_agreement" ) == 0 )
+                else if (strcmp(q, "key_agreement") == 0)
                     opt.key_usage |= MBEDTLS_X509_KU_KEY_AGREEMENT;
-                else if( strcmp( q, "key_cert_sign" ) == 0 )
+                else if (strcmp(q, "key_cert_sign") == 0)
                     opt.key_usage |= MBEDTLS_X509_KU_KEY_CERT_SIGN;
-                else if( strcmp( q, "crl_sign" ) == 0 )
+                else if (strcmp(q, "crl_sign") == 0)
                     opt.key_usage |= MBEDTLS_X509_KU_CRL_SIGN;
                 else
                     goto usage;
 
                 q = r;
             }
-        }
-        else if( strcmp( p, "force_key_usage" ) == 0 )
-        {
-            switch( atoi( q ) )
-            {
-                case 0: opt.force_key_usage = 0; break;
-                case 1: opt.force_key_usage = 1; break;
-                default: goto usage;
+        } else if (strcmp(p, "force_key_usage") == 0) {
+            switch (atoi(q)) {
+                case 0:
+                    opt.force_key_usage = 0;
+                    break;
+                case 1:
+                    opt.force_key_usage = 1;
+                    break;
+                default:
+                    goto usage;
             }
-        }
-        else if( strcmp( p, "ns_cert_type" ) == 0 )
-        {
-            while( q != NULL )
-            {
-                if( ( r = strchr( q, ',' ) ) != NULL )
+        } else if (strcmp(p, "ns_cert_type") == 0) {
+            while (q != NULL) {
+                if ((r = strchr(q, ',')) != NULL)
                     *r++ = '\0';
 
-                if( strcmp( q, "ssl_client" ) == 0 )
+                if (strcmp(q, "ssl_client") == 0)
                     opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_SSL_CLIENT;
-                else if( strcmp( q, "ssl_server" ) == 0 )
+                else if (strcmp(q, "ssl_server") == 0)
                     opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_SSL_SERVER;
-                else if( strcmp( q, "email" ) == 0 )
+                else if (strcmp(q, "email") == 0)
                     opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_EMAIL;
-                else if( strcmp( q, "object_signing" ) == 0 )
-                    opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING;
-                else if( strcmp( q, "ssl_ca" ) == 0 )
+                else if (strcmp(q, "object_signing") == 0)
+                    opt.ns_cert_type |=
+                        MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING;
+                else if (strcmp(q, "ssl_ca") == 0)
                     opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_SSL_CA;
-                else if( strcmp( q, "email_ca" ) == 0 )
+                else if (strcmp(q, "email_ca") == 0)
                     opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_EMAIL_CA;
-                else if( strcmp( q, "object_signing_ca" ) == 0 )
-                    opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING_CA;
+                else if (strcmp(q, "object_signing_ca") == 0)
+                    opt.ns_cert_type |=
+                        MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING_CA;
                 else
                     goto usage;
 
                 q = r;
             }
-        }
-        else if( strcmp( p, "force_ns_cert_type" ) == 0 )
-        {
-            switch( atoi( q ) )
-            {
-                case 0: opt.force_ns_cert_type = 0; break;
-                case 1: opt.force_ns_cert_type = 1; break;
-                default: goto usage;
+        } else if (strcmp(p, "force_ns_cert_type") == 0) {
+            switch (atoi(q)) {
+                case 0:
+                    opt.force_ns_cert_type = 0;
+                    break;
+                case 1:
+                    opt.force_ns_cert_type = 1;
+                    break;
+                default:
+                    goto usage;
             }
-        }
-        else
+        } else
             goto usage;
     }
 
-    mbedtls_x509write_csr_set_md_alg( &req, opt.md_alg );
+    mbedtls_x509write_csr_set_md_alg(&req, opt.md_alg);
 
-    if( opt.key_usage || opt.force_key_usage == 1 )
-        mbedtls_x509write_csr_set_key_usage( &req, opt.key_usage );
+    if (opt.key_usage || opt.force_key_usage == 1)
+        mbedtls_x509write_csr_set_key_usage(&req, opt.key_usage);
 
-    if( opt.ns_cert_type || opt.force_ns_cert_type == 1 )
-        mbedtls_x509write_csr_set_ns_cert_type( &req, opt.ns_cert_type );
+    if (opt.ns_cert_type || opt.force_ns_cert_type == 1)
+        mbedtls_x509write_csr_set_ns_cert_type(&req, opt.ns_cert_type);
 
     /*
      * 0. Seed the PRNG
      */
-    mbedtls_printf( "  . Seeding the random number generator..." );
-    fflush( stdout );
+    mbedtls_printf("  . Seeding the random number generator...");
+    fflush(stdout);
 
-    mbedtls_entropy_init( &entropy );
-    if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
-                               (const unsigned char *) pers,
-                               strlen( pers ) ) ) != 0 )
-    {
-        mbedtls_printf( " failed\n  !  mbedtls_ctr_drbg_seed returned %d", ret );
+    mbedtls_entropy_init(&entropy);
+    if ((ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy,
+                                     (const unsigned char *)pers,
+                                     strlen(pers))) != 0) {
+        mbedtls_printf(" failed\n  !  mbedtls_ctr_drbg_seed returned %d", ret);
         goto exit;
     }
 
-    mbedtls_printf( " ok\n" );
+    mbedtls_printf(" ok\n");
 
     /*
      * 1.0. Check the subject name for validity
      */
-    mbedtls_printf( "  . Checking subject name..." );
-    fflush( stdout );
+    mbedtls_printf("  . Checking subject name...");
+    fflush(stdout);
 
-    if( ( ret = mbedtls_x509write_csr_set_subject_name( &req, opt.subject_name ) ) != 0 )
-    {
-        mbedtls_printf( " failed\n  !  mbedtls_x509write_csr_set_subject_name returned %d", ret );
+    if ((ret = mbedtls_x509write_csr_set_subject_name(&req,
+                                                      opt.subject_name)) != 0) {
+        mbedtls_printf(
+            " failed\n  !  mbedtls_x509write_csr_set_subject_name returned %d",
+            ret);
         goto exit;
     }
 
-    mbedtls_printf( " ok\n" );
+    mbedtls_printf(" ok\n");
 
     /*
      * 1.1. Load the key
      */
-    mbedtls_printf( "  . Loading the private key ..." );
-    fflush( stdout );
+    mbedtls_printf("  . Loading the private key ...");
+    fflush(stdout);
 
-    ret = mbedtls_pk_parse_keyfile( &key, opt.filename, opt.password,
-                                    mbedtls_ctr_drbg_random, &ctr_drbg );
+    ret = mbedtls_pk_parse_keyfile(&key, opt.filename, opt.password,
+                                   mbedtls_ctr_drbg_random, &ctr_drbg);
 
-    if( ret != 0 )
-    {
-        mbedtls_printf( " failed\n  !  mbedtls_pk_parse_keyfile returned %d", ret );
+    if (ret != 0) {
+        mbedtls_printf(" failed\n  !  mbedtls_pk_parse_keyfile returned %d",
+                       ret);
         goto exit;
     }
 
-    mbedtls_x509write_csr_set_key( &req, &key );
+    mbedtls_x509write_csr_set_key(&req, &key);
 
-    mbedtls_printf( " ok\n" );
+    mbedtls_printf(" ok\n");
 
     /*
      * 1.2. Writing the request
      */
-    mbedtls_printf( "  . Writing the certificate request ..." );
-    fflush( stdout );
+    mbedtls_printf("  . Writing the certificate request ...");
+    fflush(stdout);
 
-    if( ( ret = write_certificate_request( &req, opt.output_file,
-                                           mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
-    {
-        mbedtls_printf( " failed\n  !  write_certifcate_request %d", ret );
+    if ((ret = write_certificate_request(
+             &req, opt.output_file, mbedtls_ctr_drbg_random, &ctr_drbg)) != 0) {
+        mbedtls_printf(" failed\n  !  write_certifcate_request %d", ret);
         goto exit;
     }
 
-    mbedtls_printf( " ok\n" );
+    mbedtls_printf(" ok\n");
 
     exit_code = MBEDTLS_EXIT_SUCCESS;
 
 exit:
 
-    if( exit_code != MBEDTLS_EXIT_SUCCESS )
-    {
-#ifdef MBEDTLS_ERROR_C
-        mbedtls_strerror( ret, buf, sizeof( buf ) );
-        mbedtls_printf( " - %s\n", buf );
-#else
+    if (exit_code != MBEDTLS_EXIT_SUCCESS) {
+#    ifdef MBEDTLS_ERROR_C
+        mbedtls_strerror(ret, buf, sizeof(buf));
+        mbedtls_printf(" - %s\n", buf);
+#    else
         mbedtls_printf("\n");
-#endif
+#    endif
     }
 
-    mbedtls_x509write_csr_free( &req );
-    mbedtls_pk_free( &key );
-    mbedtls_ctr_drbg_free( &ctr_drbg );
-    mbedtls_entropy_free( &entropy );
+    mbedtls_x509write_csr_free(&req);
+    mbedtls_pk_free(&key);
+    mbedtls_ctr_drbg_free(&ctr_drbg);
+    mbedtls_entropy_free(&entropy);
 
-#if defined(_WIN32)
-    mbedtls_printf( "  + Press Enter to exit this program.\n" );
-    fflush( stdout ); getchar();
-#endif
+#    if defined(_WIN32)
+    mbedtls_printf("  + Press Enter to exit this program.\n");
+    fflush(stdout);
+    getchar();
+#    endif
 
-    mbedtls_exit( exit_code );
+    mbedtls_exit(exit_code);
 }
-#endif /* MBEDTLS_X509_CSR_WRITE_C && MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO &&
+#endif /* MBEDTLS_X509_CSR_WRITE_C && MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO && \
           MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C && MBEDTLS_PEM_WRITE_C */