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/*
* Copyright (c) 2023 Ian Marco Moffett and the VegaOS team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of VegaOS nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
/*
* Vim config in share/misc/vimrc
*/
/*
* Metadata goes in *.c files
*/
__KERNEL_META("$Vega$: style.c, Ian Marco Moffett, "
"Vega style guide");
/*
* VERY important single-line comments look like this.
*/
/* Most single-line comments look like this. */
/*
* Multi-line comments look like this. Make them real sentences. Fill
* them so they look like real paragraphs.
*/
/*
* Attempt to wrap lines longer than 80 characters appropriately.
* Refer to the examples below for more information.
*/
/*
* EXAMPLE HEADER FILE.
* A header file should protect itself against
* multiple inclusion.
*/
/*
* If your header as a manpage tied to it use
* write a comment similar to the below comment
*/
/*
* For documentation: See foo(9)
*/
#ifndef _SYS_FOO_H_
#define _SYS_FOO_H_
/*
* extern declarations must only appear in header files, not in .c
* files, so the same declaration is used by the .c file defining it
* and the .c file using it, giving the compiler the opportunity to
* detect type errors.
*
* extern function declarations should not use the extern keyword,
* which is unnecessary.
*
* Exception: A subroutine written in assembly in an adjacent .S file,
* which is used only in one .c file, may be declared in the .c file.
*/
extern int g_foo;
int funnify(const char *s);
#endif /* !_SYS_FOO_H_ */
/*
* END OF EXAMPLE HEADER FILE
*/
/*
* If a header file requires structures, defines, typedefs, etc. from
* another header file it should include that header file and not depend
* on the including file for that header including both. If there are
* exceptions to this for specific headers it should be clearly documented
* in the headers and, if appropriate, the documentation. Nothing in this
* rule should suggest relaxation of the multiple inclusion rule and the
* application programmer should be free to include both regardless.
*/
/*
* Kernel include files come first.
*/
#include <sys/param.h> /* <sys/param.h> first, */
#include <sys/types.h> /* <sys/types.h> next, */
#include <sys/ioctl.h> /* and then the rest, */
#include <sys/socket.h> /* sorted lexicographically. */
#include <sys/stat.h>
#include <sys/wait.h>
/*
* Macros are capitalized, parenthesized, and should avoid side-effects.
* If they are an inline expansion of a function, the function is defined
* all in lowercase, the macro has the same name all in uppercase.
* If the macro is an expression, wrap the expression in parentheses.
* If the macro is more than a single statement, use ``do { ... } while (0)''
* or ``do { ... } while (false)'', so that a trailing semicolon works.
* Right-justify the backslashes; it makes it easier to read.
*/
#define MACRO(v, w, x, y) \
do { \
v = (x) + (y); \
w = (y) + 2; \
} while (0)
};
/*
* Sometimes we want a macro to be conditionally defined for debugging
* and expand to nothing (but still as statement) when we are not debugging:
*/
#if defined(FOO_DEBUG)
#define DPRINTF(...) KDEBUG(__VA_ARGS__)
#else
#define DPRINTF(...) __nothing
#endif /* defined(FOO_DEBUG) */
/*
* The function type must be declared on a line by itself
* preceding the function.
*/
static char *
function(int fooy)
{
/*
* When declaring variables in functions, multiple variables per line
* are okay. If a line overflows reuse the type keyword.
*
* Function prototypes and external data declarations should go in a
* suitable include file.
*
* Avoid initializing variables in the declarations; move
* declarations next to their first use, and initialize
* opportunistically. This avoids over-initialization and
* accidental bugs caused by declaration reordering.
*/
int foo, bar;
foo = 0;
bar = 0;
/*
* Casts and sizeof's are not followed by a space.
*
* We parenthesize sizeof expressions to clarify their precedence:
*
* sizeof(e) + 4
* not:
* sizeof e + 4
*
* We don't put a space before the parenthesis so that it looks like
* a function call. We always parenthesize the sizeof expression for
* consistency.
*
* On the other hand, we don't parenthesize the return statement
* because there is never a precedence ambiguity situation (it is
* a single statement).
*
* NULL is any pointer type, and doesn't need to be cast, so use
* NULL instead of (struct foo *)0 or (struct foo *)NULL. Also,
* test pointers against NULL because it indicates the type of the
* expression to the user. I.e. use:
*
* (p = f()) == NULL
* not:
* !(p = f())
*
* Don't use `!' for tests unless it's a boolean.
* E.g. use "if (*p == '\0')", not "if (!*p)".
*
* Routines returning ``void *'' should not have their return
* values cast to more specific pointer types.
*
* Prefer sizeof(*var) over sizeof(type) because if type changes,
* the change needs to be done in one place.
*
* Prefer EXIT_FAILURE instead of random error codes.
*/
/* No parentheses are needed around the return value. */
return 0;
}
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