-##
-## Coding conventions in the Samba 3.0 tree
-##
+Coding conventions in the Samba tree
+------------------------------------
+
+.. contents::
===========
Quick Start
===========
Coding style guidelines are about reducing the number of unnecessary
-reformatting patches and making things easier developers to work together.
+reformatting patches and making things easier for developers to work together.
You don't have to like them or even agree with them, but once put in place
we all have to abide by them (or vote to change them). However, coding
style should never outweigh coding itself and so the the guidelines
-described here are hopefully easier enough to follow as they are very
+described here are hopefully easy enough to follow as they are very
common and supported by tools and editors.
-The basic style, also mentioned in the SAMBA_4_0/prog_guide.txt is the
-Linux kernel coding style (See Documentation/CodingStyle in the kernel
-source tree). The closely matches what most Samba developers use already
-anyways.
+The basic style, also mentioned in prog_guide4.txt, is the Linux kernel coding
+style (See Documentation/CodingStyle in the kernel source tree). This closely
+matches what most Samba developers use already anyways.
But to save you the trouble of reading the Linux kernel style guide, here
are the highlights.
-
* Maximum Line Width is 80 Characters
The reason is not for people with low-res screens but rather sticking
to 80 columns prevents you from easily nesting more than one level of
--
(Thanks to SATOH Fumiyasu <fumiyas@osstech.jp> for these hints):
-For the basic vi editor including with all variants of *nix, add the
+For the basic vi editor including with all variants of \*nix, add the
following to $HOME/.exrc:
set tabstop=8
set shiftwidth=8
For Vim, the following settings in $HOME/.vimrc will also deal with
-displaying trailing whitespace:
+displaying trailing whitespace::
if has("syntax") && (&t_Co > 2 || has("gui_running"))
syntax on
" Show tabs, trailing whitespace, and continued lines visually
set list listchars=tab:»·,trail:·,extends:…
+ " highlight overly long lines same as TODOs.
+ set textwidth=80
+ autocmd BufNewFile,BufRead *.c,*.h exec 'match Todo /\%>' . &textwidth . 'v.\+/'
+
+
=========================
FAQ & Statement Reference
=========================
Comments
--------
-Comments should always use the standard C syntax. I.e. /* ... */. C++
+Comments should always use the standard C syntax. C++
style comments are not currently allowed.
another language keyword such as else or the closing while in a do..while
loop.
-Good examples:
+Good examples::
if (x == 1) {
printf("good\n");
printf("also good\n");
} while (1);
-Bad examples:
+Bad examples::
while (1)
{
----
While many people have been academically taught that goto's are fundamentally
-evil, then can greatly enhance readability and reduce memory leaks when used
+evil, they can greatly enhance readability and reduce memory leaks when used
as the single exit point from a function. But in no Samba world what so ever
is a goto outside of a function or block of code a good idea.
-Good Examples:
-
-int function foo(int y)
-{
- int *z = NULL;
- int ret = 0;
+Good Examples::
- if ( y < 10 ) {
- z = malloc(sizeof(int)*y);
- if (!z) {
- ret = 1;
- goto done;
+ int function foo(int y)
+ {
+ int *z = NULL;
+ int ret = 0;
+
+ if ( y < 10 ) {
+ z = malloc(sizeof(int)*y);
+ if (!z) {
+ ret = 1;
+ goto done;
+ }
}
- }
- print("Allocated %d elements.\n", y);
+ print("Allocated %d elements.\n", y);
- done:
- if (z)
- free(z);
+ done:
+ if (z)
+ free(z);
- return ret;
-}
+ return ret;
+ }
Checking Pointer Values
When invoking functions that return pointer values, either of the following
are acceptable. Use you best judgement and choose the more readable option.
-Remember that many other people will review it.
+Remember that many other people will review it.::
if ((x = malloc(sizeof(short)*10)) == NULL ) {
fprintf(stderr, "Unable to alloc memory!\n");
}
-or
+or::
x = malloc(sizeof(short)*10);
if (!x) {
fprintf(stderr, "Unable to alloc memory!\n");
}
+
+
+Primitive Data Types
+--------------------
+
+Samba has large amounts of historical code which makes use of data types
+commonly supported by the C99 standard. However, at the time such types
+as boolean and exact width integers did not exist and Samba developers
+were forced to provide their own. Now that these types are guaranteed to
+be available either as part of the compiler C99 support or from lib/replace/,
+new code should adhere to the following conventions:
+
+ * Booleans are of type "bool" (not BOOL)
+ * Boolean values are "true" and "false" (not True or False)
+ * Exact width integers are of type [u]int[8|16|32|64]_t
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