During preprocessing, we find directives, and if they specify including
other source files, we remove the directive, allocate a new block of
memory, copy the first block, append the new source file, and append the
second block.
Previously, the value of the source pointer was passed into the
preprocessing function. When the memory would be (re)allocated, the
pointer value could change, but the original pointer would not be
updated.
Now, the pointer is passed by address, and updated when the memory it
points to changes.
This commit refactors the project using a single, consistent coding
style, derived from the Linux Kernel Coding Style, available here:
https://www.kernel.org/doc/Documentation/CodingStyle
This includes, but is not limited to:
* Removal of typedefs, especially for structs
* Limiting lines to a reasonable length, 80 characters, mostly
* K&R style braces
* Removal of CamelCase
The htab_structure has been modified in two ways, which should not break
compatability with any of its uses.
It includes a void pointer, which is in this commit used to point to a
string for defines, and will in the future be used to point to the address
space for words, bytes, and double words.
It now includes a function htab_add_str specifically for storing strings.
It calls htab_add so as not to be redundant, but makes the node's value
their index for the lexer to fetch using htab_find, and assigns their
void pointer.
The lexer will now use htab_find on all tokens to see if they are a define
string, and if so, substitute them with the appropriate token.
The defines htab is destroyed after lexing, because that memory is done.
This commit adds behavior to the preprocessor which fills a tree with
defines and their replacements. In future commits, the parser will
substitute instances of the defines with their replacements in the
source code.
