[PATCH, final] Formatted output of IEEE exceptional values

[Jerry DeLisle]

The attached patch and test case reflect the additional case of a field 
width specified as zero.

F2003 says: "When w is zero, the processor selects the field width".

I have selected that width to be 4 in the case of exceptional values to 
output -Inf or +Inf

F2003 also says: "If w is less than 3, the field is filled with 
asterisks; otherwise; if w is less than 8, 'Inf' is produced".

The negative sign is not optional, so I have interpreted the case of w=3 
to  be -Inf which exceeds the field width and so asterisks are produced.

The result is as follows:

F0.0  |       -Inf|       +Inf|        NaN|        NaN|
F1.0  |          *|          *|          *|          *|
F2.0  |         **|         **|         **|         **|
F3.0  |        ***|        Inf|        NaN|        NaN|
F4.0  |       -Inf|       +Inf|        NaN|        NaN|
F5.0  |       -Inf|       +Inf|        NaN|        NaN|
F6.0  |       -Inf|       +Inf|        NaN|        NaN|
F7.0  |       -Inf|       +Inf|        NaN|        NaN|
F8.0  |       -Inf|       +Inf|        NaN|        NaN|
F9.0  |  -Infinity|  +Infinity|        NaN|        NaN|
F10.0 |  -Infinity|  +Infinity|        NaN|        NaN|

Note that in the case of F0 the four characters will be written to the 
right of the current position since there is no actual field to align with.

Bubblestrapped and reg tested.

2005-07-23  Jerry DeLisle  <jvdelisle@verizon.net>

	* io/write.c (write_float): Revise output of IEEE exceptional
	values to comply with F95 and F2003 standards.

OK for mainline and 4.0?

Regards,

Jerry
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