diff --git a/include/shared.h b/include/shared.h
index 9c9849423..11012f419 100644
--- a/include/shared.h
+++ b/include/shared.h
@@ -31,7 +31,7 @@ char *filename_from_filepath (char *filepath);
 void naive_replace (char *s, const char key_char, const char replace_char);
 void naive_escape (char *s, size_t s_max, const char key_char, const char escape_char);
 
-void hc_asprintf (char **strp, const char *fmt, ...);
+__attribute__ ((format (printf, 2, 3))) void hc_asprintf (char **strp, const char *fmt, ...);
 
 void setup_environment_variables (void);
 void setup_umask (void);
diff --git a/src/dispatch.c b/src/dispatch.c
index 81ca61fb8..6344e13a0 100644
--- a/src/dispatch.c
+++ b/src/dispatch.c
@@ -126,7 +126,7 @@ static int calc_stdin (hashcat_ctx_t *hashcat_ctx, hc_device_param_t *device_par
 
   bool iconv_enabled = false;
 
-  iconv_t iconv_ctx;
+  iconv_t iconv_ctx = NULL;
 
   char *iconv_tmp = NULL;
 
diff --git a/src/interface.c b/src/interface.c
index e512a3e85..fe71760c4 100644
--- a/src/interface.c
+++ b/src/interface.c
@@ -18519,7 +18519,7 @@ int ascii_digest (hashcat_ctx_t *hashcat_ctx, char *out_buf, const size_t out_le
       cost++;
     }
 
-    snprintf (out_buf, out_len - 1, "%s%d$%u$%d$%s$%u$%08x%08x%08x%08x$%u$%u$%u$%s",
+    snprintf (out_buf, out_len - 1, "%s%u$%u$%u$%s$%u$%08x%08x%08x%08x$%u$%u$%u$%s",
       SIGNATURE_SEVEN_ZIP,
       salt.salt_sign[0],
       cost,
@@ -18539,7 +18539,7 @@ int ascii_digest (hashcat_ctx_t *hashcat_ctx, char *out_buf, const size_t out_le
     {
       u32 bytes_written = strlen (out_buf);
 
-      snprintf (out_buf + bytes_written, out_len - bytes_written - 1, "$%i$", seven_zip->crc_len);
+      snprintf (out_buf + bytes_written, out_len - bytes_written - 1, "$%u$", seven_zip->crc_len);
 
       bytes_written = strlen (out_buf);
 
@@ -19130,7 +19130,7 @@ int ascii_digest (hashcat_ctx_t *hashcat_ctx, char *out_buf, const size_t out_le
 
     wpky[80] = 0;
 
-    snprintf (out_buf, out_len - 1, "%s*%i*%s*%i*%s**",
+    snprintf (out_buf, out_len - 1, "%s*%u*%s*%u*%s**",
       SIGNATURE_ITUNES_BACKUP,
       salt.salt_sign[0],
       wpky,
@@ -19192,7 +19192,7 @@ int ascii_digest (hashcat_ctx_t *hashcat_ctx, char *out_buf, const size_t out_le
 
     dpsl[40] = 0;
 
-    snprintf (out_buf, out_len - 1, "%s*%i*%s*%i*%s*%i*%s",
+    snprintf (out_buf, out_len - 1, "%s*%u*%s*%u*%s*%u*%s",
       SIGNATURE_ITUNES_BACKUP,
       salt.salt_sign[0],
       wpky,
@@ -19213,7 +19213,7 @@ int ascii_digest (hashcat_ctx_t *hashcat_ctx, char *out_buf, const size_t out_le
 
     // output:
 
-    snprintf (out_buf, out_len - 1, "$sha1$%i$%s$%s",
+    snprintf (out_buf, out_len - 1, "$sha1$%u$%s$%s",
       salt.salt_iter + 1,
       (char *) salt.salt_buf,
       ptr_plain);
@@ -19298,7 +19298,7 @@ int ascii_digest (hashcat_ctx_t *hashcat_ctx, char *out_buf, const size_t out_le
       memcpy(hash_algorithm,   "sha1", strlen("sha1"));
     }
 
-    snprintf (out_buf, out_len - 1, "%s%d*%d*%s*%s*%s*%d*%s*%d*%s",
+    snprintf (out_buf, out_len - 1, "%s%u*%u*%s*%s*%s*%u*%s*%u*%s",
       SIGNATURE_DPAPIMK,
       version,
       context,
@@ -19363,7 +19363,7 @@ int ascii_digest (hashcat_ctx_t *hashcat_ctx, char *out_buf, const size_t out_le
     ethereum_pbkdf2_t *ethereum_pbkdf2s = (ethereum_pbkdf2_t *) esalts_buf;
     ethereum_pbkdf2_t *ethereum_pbkdf2  = &ethereum_pbkdf2s[digest_cur];
 
-    snprintf (out_buf, out_len - 1, "%s*%d*%s*%08x%08x%08x%08x%08x%08x%08x%08x*%08x%08x%08x%08x%08x%08x%08x%08x",
+    snprintf (out_buf, out_len - 1, "%s*%u*%s*%08x%08x%08x%08x%08x%08x%08x%08x*%08x%08x%08x%08x%08x%08x%08x%08x",
       SIGNATURE_ETHEREUM_PBKDF2,
       salt.salt_iter + 1,
       (char *) salt.salt_buf,
@@ -19390,7 +19390,7 @@ int ascii_digest (hashcat_ctx_t *hashcat_ctx, char *out_buf, const size_t out_le
     ethereum_scrypt_t *ethereum_scrypts = (ethereum_scrypt_t *) esalts_buf;
     ethereum_scrypt_t *ethereum_scrypt  = &ethereum_scrypts[digest_cur];
 
-    snprintf (out_buf, out_len - 1, "%s*%d*%d*%d*%s*%08x%08x%08x%08x%08x%08x%08x%08x*%08x%08x%08x%08x%08x%08x%08x%08x",
+    snprintf (out_buf, out_len - 1, "%s*%u*%u*%u*%s*%08x%08x%08x%08x%08x%08x%08x%08x*%08x%08x%08x%08x%08x%08x%08x%08x",
       SIGNATURE_ETHEREUM_SCRYPT,
       salt.scrypt_N,
       salt.scrypt_r,
@@ -19666,7 +19666,7 @@ int ascii_digest (hashcat_ctx_t *hashcat_ctx, char *out_buf, const size_t out_le
       const chacha20_t *chacha20_tmp = (const chacha20_t *) esalts_buf;
       const chacha20_t *chacha20     = &chacha20_tmp[digest_cur];
 
-      snprintf (out_buf, out_len - 1, "%s*%08x%08x*%d*%08x%08x*%08x%08x*%08x%08x",
+      snprintf (out_buf, out_len - 1, "%s*%08x%08x*%u*%08x%08x*%08x%08x*%08x%08x",
         SIGNATURE_CHACHA20,
         byte_swap_32(chacha20->position[0]),
         byte_swap_32(chacha20->position[1]),
diff --git a/src/monitor.c b/src/monitor.c
index 256d11bd0..0446d1a15 100644
--- a/src/monitor.c
+++ b/src/monitor.c
@@ -58,12 +58,12 @@ static int monitor (hashcat_ctx_t *hashcat_ctx)
   bool hwmon_check        = false;
   bool performance_check  = false;
 
-  const int   sleep_time      = 1;
-  const int   temp_threshold  = 1;      // degrees celcius
-  const int   fan_speed_min   = 33;     // in percentage
-  const int   fan_speed_max   = 100;
-  const float exec_low        = 50.0f;  // in ms
-  const float util_low        = 90.0f;  // in percent
+  const int    sleep_time      = 1;
+  const int    temp_threshold  = 1;      // degrees celcius
+  const int    fan_speed_min   = 33;     // in percentage
+  const int    fan_speed_max   = 100;
+  const double exec_low        = 50.0;  // in ms
+  const double util_low        = 90.0;  // in percent
 
   if (user_options->runtime)
   {
diff --git a/src/user_options.c b/src/user_options.c
index b7a3901f7..acac1f5e6 100644
--- a/src/user_options.c
+++ b/src/user_options.c
@@ -110,7 +110,7 @@ static const struct option long_options[] =
   {"veracrypt-pim",             required_argument, 0, IDX_VERACRYPT_PIM},
   {"version",                   no_argument,       0, IDX_VERSION},
   {"workload-profile",          required_argument, 0, IDX_WORKLOAD_PROFILE},
-  {0, 0, 0, 0}
+  {}
 };
 
 static char ENCODING_FROM[] = "utf-8";
@@ -301,8 +301,6 @@ int user_options_getopt (hashcat_ctx_t *hashcat_ctx, int argc, char **argv)
 
         return -1;
       }
-
-      break;
     }
   }