client.c: Changed return for direct exit(3) in read file functions

Added documentation and "exit(3)" in read_version_file(), instead of "return
NULL".
Added documentation and "exit(12)" in read_xml_file() instead of "return
NULL".

Signed-off-by: Erik Alexandre Pucci <eap08@c3sl.ufpr.br>
Acked-by: Ricardo Tavares de Oliveira <rto07@c3sl.ufpr.br>
Signed-off-by: Danilo K. S. Yorinori <danilok@c3sl.ufpr.br>

src/client.c

@@ -76,12 +76,7 @@ int main(int argc, char **argv)
     if (option == 2)
     {
         /* Get client version from file */
-        if ( ! (clientVersion = read_version_file(basedir)) )
-        {
-            /* Error when open version file */
-            exit(3);
-        }
-
+        clientVersion = read_version_file(basedir);
         /* Agent Version method */
         check_version(soap, url, clientVersion);
     }
@@ -323,7 +318,8 @@ static char *read_version_file(char *basedir)
     if ( ! (version = (char *) malloc(11 * sizeof(char))) )
     {
         ERROR("ERROR (3): Memory allocation error.\n");
-        return NULL;
+        /* Error while trying to allocate memory for version string */
+        exit(3);
     }
 
     /* Open version file */
@@ -331,7 +327,8 @@ static char *read_version_file(char *basedir)
     {
         ERROR("ERROR (3): Problem while trying to open version file.\n");
         ERROR("File: %s.\n", filepath);
-        return NULL;
+        /* Error while trying to open version file */
+        exit(3);
     }
 
     /* Read from version file */
@@ -495,7 +492,8 @@ char *read_xml_file(char *basedir)
     {
         ERROR("ERROR (12): Problem while trying to open the ");
         ERROR("collect_data.xml file.\n");
-        return NULL;
+        /* Error while trying to open XML data file */
+        exit(12);
     }
 
     /* Read and copy from data file to string */
@@ -510,7 +508,8 @@ char *read_xml_file(char *basedir)
         if (xmlInventory == NULL)
         {
             ERROR("ERROR (12): Memory allocation error for xmlInventory.\n");
-            return NULL;
+            /* Error while trying to allocate memory for XML data string */
+            exit(12);
         }
         xmlInventory[i++] = aux;
     }