Use char* as input to flex

String input to flex lexer

	YY_BUFFER_STATE yy_scan_string(const char *str); /* scans a NUL-terminated string */
	YY_BUFFER_STATE yy_scan_bytes(const char *bytes, int len); /* scans len bytes (including possibly NULs) starting at location bytes */
	YY_BUFFER_STATE yy_scan_buffer(char *base, yy_size_t size); /* avoid copy */

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http://flex.sourceforge.net/manual/Multiple-Input-Buffers.html#Scanning%20Strings