You are free to add any new features you like to
However, if you want your changes to be incorporated into the
distribution, there are several steps that you need to take in order to
make it possible to include your changes:
gawkitself, consider writing it as an extension module (see Dynamic Extensions). If that’s not possible, continue with the rest of the steps in this list.
gawk. If your version of
gawkis very old, I may not be able to integrate them at all. (See Getting, for information on getting the latest version of
gawk. (The GNU Coding Standards are available from the GNU Project’s web site. Texinfo, Info, and DVI versions are also available.)
gawkcoding style. The C code for
gawkfollows the instructions in the GNU Coding Standards, with minor exceptions. The code is formatted using the traditional “K&R” style, particularly as regards to the placement of braces and the use of TABs. In brief, the coding rules for
gawkare as follows:
int, on the line above the line with the name and arguments of the function.
forloop initialization and increment parts, and in macro bodies.
'\0'in the conditions of
forstatements, as well as in the
switchstatements, instead of just the plain pointer or character value.
NULLsymbolic constant for pointer values, and the character constant
'\0'where appropriate, instead of
alloca()function for allocating memory off the stack. Its use causes more portability trouble than is worth the minor benefit of not having to free the storage. Instead, use
strcmp()is not a boolean!” Instead, use ‘strcmp(a, b) == 0’.
0x004, and son on) instead of shifting one left by successive amounts (‘(1<<0)’, ‘(1<<1)’, and so on).
NOTE: If I have to reformat your code to follow the coding style used in
gawk, I may not bother to integrate your changes at all.
manpage as well.
You will also have to sign paperwork for your documentation changes.
gawksource tree with your version. I recommend using the GNU version of
diff, or best of all, ‘git diff’ or ‘git format-patch’. Send the output produced by
diffto me when you submit your changes. (See Bugs, for the electronic mail information.)
Using this format makes it easy for me to apply your changes to the
master version of the
gawk source code (using
If I have to apply the changes manually, using a text editor, I may
not do so, particularly if there are lots of changes.
Although this sounds like a lot of work, please remember that while you may write the new code, I have to maintain it and support it. If it isn’t possible for me to do that with a minimum of extra work, then I probably will not.