Semi-small fix to make SourceMM ignore whitespace in metaplugins.ini with UTIL_TrimLeft and UTIL_TrimRight

(I'm not sure if I'm qualified to make efficient string functions here, so um, they probably are pretty bad)

--HG--
extra : convert_revision : svn%3Ac2935e3e-5518-0410-8daf-afa5dab7d4e3/trunk%4085

sourcemm/sourcemm.cpp

@@ -334,7 +334,11 @@ int LoadPluginsFromFile(const char *file)
 			continue;
 		if (buffer[length-1] == '\n')
 			buffer[length-1] = '\0';
-		if (buffer[0] == ';' || strncmp(buffer, "//", 2) == 0)
+
+		UTIL_TrimLeft(buffer);
+		UTIL_TrimRight(buffer);
+
+		if (buffer[0] == NULL || buffer[0] == ';' || strncmp(buffer, "//", 2) == 0)
 			continue;
 		//First find if it's an absolute path or not...
 		if (buffer[0] == '/' || strncmp(&(buffer[1]), ":\\", 2) == 0)

sourcemm/util.cpp

@@ -8,6 +8,7 @@
 * ============================
 */
 
+#include <ctype.h>
 #include <string.h>
 #include "util.h"
 
@@ -38,3 +39,43 @@ const char *UTIL_GetExtension(const char *file)
 	return NULL;
 }
 
+/* UTIL_TrimLeft
+ * Removes whitespace characters from left side of string
+ */
+void UTIL_TrimLeft(char *buffer)
+{
+	// Let's think of this as our iterator
+	char *i = buffer;
+
+	// Make sure the buffer isn't null
+	if (i && *i)
+	{
+		// Add up number of whitespace characters
+		while(isspace(*i))
+			i++;
+
+		// If whitespace chars in buffer then adjust string so first non-whitespace char is at start of buffer
+		if (i != buffer)
+			memcpy(buffer, i, (strlen(i) + 1) * sizeof(char));
+	}
+}
+
+/* UTIL_TrimLeft
+ * Removes whitespace characters from right side of string
+ */
+void UTIL_TrimRight(char *buffer)
+{
+	// Make sure buffer isn't null
+	if (buffer)
+	{
+		// Loop through buffer backwards while replacing whitespace chars with null chars
+		for (unsigned int i = strlen(buffer) - 1; i >= 0; i--)
+		{
+			if (isspace(buffer[i]))
+				buffer[i] = '\0';
+			else
+				break;
+		}
+	}
+}
+

sourcemm/util.h

@@ -17,6 +17,8 @@
  */
 
 const char *UTIL_GetExtension(const char *file);
+void UTIL_TrimLeft(char *buffer);
+void UTIL_TrimRight(char *buffer);
 
 #define META_INTERFACE_MACRO(type, final) \
 	PluginIter i; \