5 files changed, 5 insertions, 10 deletions

diff --git a/plugins-root/check_dhcp.c b/plugins-root/check_dhcp.c
index 6b07df51..4b8f5e27 100644
--- a/plugins-root/check_dhcp.c
+++ b/plugins-root/check_dhcp.c
@@ -497,7 +497,7 @@ int send_dhcp_discover(int sock){
                 memcpy(&discover_packet.options[opts],&requested_address,sizeof(requested_address));
                 opts += sizeof(requested_address);
         }
-        discover_packet.options[opts++]=DHCP_OPTION_END;
+        discover_packet.options[opts++]= (char)DHCP_OPTION_END;
 
         /* unicast fields */
         if(unicast)
diff --git a/plugins/check_http.c b/plugins/check_http.c
index 110f1188..425ce86b 100644
--- a/plugins/check_http.c
+++ b/plugins/check_http.c
@@ -472,9 +472,8 @@ bool process_arguments (int argc, char **argv)
       http_method = strdup (optarg);
       char *tmp;
       if ((tmp = strstr(http_method, ":")) != NULL) {
-        tmp[0] = '\0';
-        http_method = http_method;
-        http_method_proxy = ++tmp;
+        tmp[0] = '\0'; // set the ":" in the middle to 0
+        http_method_proxy = ++tmp; // this points to the second part
       }
       break;
     case 'd': /* string or substring */
diff --git a/plugins/check_snmp.c b/plugins/check_snmp.c
index 7ee9d0ca..295aa9b5 100644
--- a/plugins/check_snmp.c
+++ b/plugins/check_snmp.c
@@ -691,7 +691,6 @@ process_arguments (int argc, char **argv)
 {
         char *ptr;
         int c = 1;
-        int ii = 0;
         size_t j = 0, jj = 0;
 
         int option = 0;
@@ -848,7 +847,6 @@ process_arguments (int argc, char **argv)
                         numoids = j;
                         if (c == 'E' || c == 'e') {
                                 jj++;
-                                ii++;
                                 while (j+1 >= eval_size) {
                                         eval_size += OID_COUNT_STEP;
                                         eval_method = realloc(eval_method, eval_size * sizeof(*eval_method));
@@ -875,7 +873,6 @@ process_arguments (int argc, char **argv)
                                 memset(eval_method + eval_size - OID_COUNT_STEP, 0, 8);
                         }
                         eval_method[jj++] = CRIT_STRING;
-                        ii++;
                         break;
                 case 'R':                                                                       /* regex */
                         cflags = REG_ICASE;
@@ -896,7 +893,6 @@ process_arguments (int argc, char **argv)
                                 memset(eval_method + eval_size - OID_COUNT_STEP, 0, 8);
                         }
                         eval_method[jj++] = CRIT_REGEX;
-                        ii++;
                         break;
 
         /* Format */
diff --git a/plugins/popen.c b/plugins/popen.c
index 036bc608..54e63bc5 100644
--- a/plugins/popen.c
+++ b/plugins/popen.c
@@ -105,7 +105,7 @@ spopen (const char *cmdstring)
 #endif
 
         env[0] = strdup("LC_ALL=C");
-        env[1] = '\0';
+        env[1] = NULL;
 
         /* if no command was passed, return with no error */
         if (cmdstring == NULL)
diff --git a/plugins/runcmd.c b/plugins/runcmd.c
index 32fd6b96..ed49bb99 100644
--- a/plugins/runcmd.c
+++ b/plugins/runcmd.c
@@ -115,7 +115,7 @@ np_runcmd_open(const char *cmdstring, int *pfd, int *pfderr)
         if(!np_pids) NP_RUNCMD_INIT;
 
         env[0] = strdup("LC_ALL=C");
-        env[1] = '\0';
+        env[1] = NULL;
 
         /* make copy of command string so strtok() doesn't silently modify it */
         /* (the calling program may want to access it later) */