client.c: Created read_xml_file() to read the XML data file

read_xml_file() creates xmlInventory string and copies the XML data file,
returning a pointer to it in success or NULL in case of error.

Signed-off-by: Erik Alexandre Pucci <eap08@c3sl.ufpr.br>
Acked-by: Diego Giovane Pasqualin <dgp06@c3sl.ufpr.br>
Acked-by: Josiney de Souza <josineys@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

@@ -244,3 +244,57 @@ void availability(struct soap *soap, char *url, char *inep, char *macAddr)
         exit(6);
     }
 }
+
+/*----------------------------------------------------------------------------
+ * Summary: Read XML data file and return the xmlInventory string.
+ * Parameters:
+ *      basedir     String with directory path
+ * Return: String with xml data.
+ */
+char *read_xml_file(char *basedir)
+{
+    FILE *xmlFile;
+    int aux;
+    int i = 0;
+    int tam = 1;
+    char filePath[strlen(basedir) + strlen(COLLECTDATAFILE) + 1];
+    char *xmlInventory = NULL;
+
+    /* Construct filePath */
+    strcpy(filePath, basedir);
+    strcat(filePath, COLLECTDATAFILE);
+    if (DEBUG)
+    {
+        printf("%s %s %s\n", basedir, COLLECTDATAFILE, filePath);
+    }
+
+    /* Open XML collect data file and check for errors */
+    xmlFile = fopen(filePath, "r");
+    if ( xmlFile == NULL )
+    {
+        fprintf(stderr, "Problem while trying to open the ");
+        fprintf(stderr, "collect_data.xml file.\n");
+        return NULL;
+    }
+
+    /* Read and copy from data file to string */
+    xmlInventory = (char *) malloc(sizeof(char));
+    while ( (aux = fgetc(xmlFile)) != EOF )
+    {
+        if ( tam <= i )
+        {
+            tam *= 2;
+            xmlInventory = (char *) realloc(xmlInventory, tam * sizeof(char));
+        }
+        if (xmlInventory == NULL)
+        {
+            fprintf(stderr, "Memory allocation error for xmlInventory.\n");
+            return NULL;
+        }
+        xmlInventory[i++] = aux;
+    }
+
+    /* Close file and return a pointer to "xmlInventory" */
+    fclose(xmlFile);
+    return xmlInventory;
+}