This is a dynamic string buffer, which expands as needed, and never
overflows.

In addition, the string length is saved, so it is faster than doing
strcat()s.


Installation is pretty easy. First, move MAX_MEM_LIST from db.c into merc.h.
Then add #include "buffer.h" somewhere in merc.h, and buffer.o to the object
files in Makefile.


Example use:

void somefunction()
{
	/* allocate memory, start with roughy 1000 bytes */
	BUFFER *buf = buffer_new(1000);

	for (...) /* some loop where we find output */
	{
		/* .... */
		bprintf (buf, "The player %s has %d X and %d Z.\n\r", str, i, i2);
	}

	/* finished, send result */

	send_to_char (buf->data, ch);
	
	/* free memory */
	
	buffer_free (buf);
}

1) Allocate the buffer, using buffer_new(). The size given is the starting
size: if you know you will be needing a large buffer, you can start with a
larger size.

2) Use the buffer. There are 2 functions: buffer_strcat and bprintf.

buffer_strcat (buffer, "some string"); adds this string to the buffer.

bprintf (buffer, "format: %s", string); corresponds roughly to:

char temp_buf[1024];
sprintf (temp_buf, format, ....);
buffer_strcat (buffer, temp_buf);

However, it is much more covenient, and it checks for overflow in the
temp_buf.


3) Send results, they are in buffer->data

4) Free the buffer, using buffer_free(buffer)

This buffer system is faster and safer than using strcat(): you will never
overflow this buffer, if you use buffer_strcat() and bprintf() to access it.

The buffers were inspired by Russ Taylor's buffer system in ROM.