SPDX is an international standard for documenting software license
requirements. Remove the existing headers and replace with a brief
SPDX preamble.
See: https://spdx.dev/use/specifications/
The script used to convert the files is added to "tools", and the
file header templates in headers/ are updated.
Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Create our own ctype table where we can do the tests we want to do
cheaply, instead of calling ctype functions and then adding additional
tests all over the code.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
nasmlib.c had basically turned into a garbage bin of various functions
with very little in common. Break it up into logical components for
isolation and manageability.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
