" Vim syntax file
" Language:	C
" Maintainer:	Bram Moolenaar <Bram@vim.org>
" Last Change:	2001 May 17

" For version 5.x: Clear all syntax items
" For version 6.x: Quit when a syntax file was already loaded
if version < 600
  syntax clear
elseif exists("b:current_syntax")
  finish
endif

" A bunch of useful C keywords
syn keyword	cStatement	goto break return continue asm
syn keyword	cLabel		case default
syn keyword	cConditional	if else switch
syn keyword	cRepeat		while for do

syn keyword	cTodo		contained TODO FIXME XXX

" cCommentGroup allows adding matches for special things in comments
syn cluster	cCommentGroup	contains=cTodo

" String and Character constants
" Highlight special characters (those which have a backslash) differently
syn match	cSpecial	display contained "\\\(x\x\+\|\o\{1,3}\|.\|$\)"
if !exists("c_no_utf")
  syn match	cSpecial	display contained "\\\(u\x\{4}\|U\x\{8}\)"
endif
if exists("c_no_cformat")
  syn region	cString		start=+L\="+ skip=+\\\\\|\\"+ end=+"+ contains=cSpecial
  " cCppString: same as cString, but ends at end of line
  syn region	cCppString	start=+L\="+ skip=+\\\\\|\\"\|\\$+ excludenl end=+"+ end='$' contains=cSpecial
else
  syn match	cFormat		display "%\(\d\+\$\)\=[-+' #0*]*\(\d*\|\*\|\*\d\+\$\)\(\.\(\d*\|\*\|\*\d\+\$\)\)\=\([hlL]\|ll\)\=\([diuoxXfeEgGcCsSpn]\|\[\^\=.[^]]*\]\)" contained
  syn match	cFormat		display "%%" contained
  syn region	cString		start=+L\="+ skip=+\\\\\|\\"+ end=+"+ contains=cSpecial,cFormat
  " cCppString: same as cString, but ends at end of line
  syn region	cCppString	start=+L\="+ skip=+\\\\\|\\"\|\\$+ excludenl end=+"+ end='$' contains=cSpecial,cFormat
endif

syn match	cCharacter	"L\='[^\\]'"
syn match	cCharacter	"L'[^']*'" contains=cSpecial
if exists("c_gnu")
  syn match	cSpecialError	"L\='\\[^'\"?\\abefnrtv]'"
  syn match	cSpecialCharacter "L\='\\['\"?\\abefnrtv]'"
else
  syn match	cSpecialError	"L\='\\[^'\"?\\abfnrtv]'"
  syn match	cSpecialCharacter "L\='\\['\"?\\abfnrtv]'"
endif
syn match	cSpecialCharacter display "L\='\\\o\{1,3}'"
syn match	cSpecialCharacter display "'\\x\x\{1,2}'"
syn match	cSpecialCharacter display "L'\\x\x\+'"

"when wanted, highlight trailing white space
if exists("c_space_errors")
  if !exists("c_no_trail_space_error")
    syn match	cSpaceError	display excludenl "\s\+$"
  endif
  if !exists("c_no_tab_space_error")
    syn match	cSpaceError	display " \+\t"me=e-1
  endif
endif

"catch errors caused by wrong parenthesis and brackets
syn cluster	cParenGroup	contains=cParenError,cIncluded,cSpecial,cCommentSkip,cCommentString,cComment2String,@cCommentGroup,cCommentStartError,cUserCont,cUserLabel,cBitField,cCommentSkip,cOctalZero,cCppOut,cCppOut2,cCppSkip,cFormat,cNumber,cFloat,cOctal,cOctalError,cNumbersCom
if exists("c_no_bracket_error")
  syn region	cParen		transparent start='(' end=')' contains=ALLBUT,@cParenGroup,cCppParen,cCppString
  " cCppParen: same as cParen but ends at end-of-line; used in cDefine
  syn region	cCppParen	transparent start='(' skip='\\$' excludenl end=')' end='$' contained contains=ALLBUT,@cParenGroup,cParen,cString
  syn match	cParenError	display ")"
  syn match	cErrInParen	display contained "[{}]"
else
  syn region	cParen		transparent start='(' end=')' contains=ALLBUT,@cParenGroup,cCppParen,cErrInBracket,cCppBracket,cCppString
  " cCppParen: same as cParen but ends at end-of-line; used in cDefine
  syn region	cCppParen	transparent start='(' skip='\\$' excludenl end=')' end='$' contained contains=ALLBUT,@cParenGroup,cErrInBracket,cParen,cBracket,cString
  syn match	cParenError	display "[\])]"
  syn match	cErrInParen	display contained "[\]{}]"
  syn region	cBracket	transparent start='\[' end=']' contains=ALLBUT,@cParenGroup,cErrInParen,cCppParen,cCppBracket,cCppString
  " cCppBracket: same as cParen but ends at end-of-line; used in cDefine
  syn region	cCppBracket	transparent start='\[' skip='\\$' excludenl end=']' end='$' contained contains=ALLBUT,@cParenGroup,cErrInParen,cParen,cBracket,cString
  syn match	cErrInBracket	display contained "[);{}]"
endif

"integer number, or floating point number without a dot and with "f".
syn case ignore
syn match	cNumbers	display transparent "\<\d\|\.\d" contains=cNumber,cFloat,cOctalError,cOctal
" Same, but without octal error (for comments)
syn match	cNumbersCom	display contained transparent "\<\d\|\.\d" contains=cNumber,cFloat,cOctal
syn match	cNumber		display contained "\d\+\(u\=l\{0,2}\|ll\=u\)\>"
"hex number
syn match	cNumber		display contained "0x\x\+\(u\=l\{0,2}\|ll\=u\)\>"
" Flag the first zero of an octal number as something special
syn match	cOctal		display contained "0\o\+\(u\=l\{0,2}\|ll\=u\)\>" contains=cOctalZero
syn match	cOctalZero	display contained "\<0"
syn match	cFloat		display contained "\d\+f"
"floating point number, with dot, optional exponent
syn match	cFloat		display contained "\d\+\.\d*\(e[-+]\=\d\+\)\=[fl]\="
"floating point number, starting with a dot, optional exponent
syn match	cFloat		display contained "\.\d\+\(e[-+]\=\d\+\)\=[fl]\=\>"
"floating point number, without dot, with exponent
syn match	cFloat		display contained "\d\+e[-+]\=\d\+[fl]\=\>"
" flag an octal number with wrong digits
syn match	cOctalError	display contained "0\o*[89]\d*"
syn case match

if exists("c_comment_strings")
  " A comment can contain cString, cCharacter and cNumber.
  " But a "*/" inside a cString in a cComment DOES end the comment!  So we
  " need to use a special type of cString: cCommentString, which also ends on
  " "*/", and sees a "*" at the start of the line as comment again.
  " Unfortunately this doesn't very well work for // type of comments :-(
  syntax match	cCommentSkip	contained "^\s*\*\($\|\s\+\)"
  syntax region cCommentString	contained start=+L\="+ skip=+\\\\\|\\"+ end=+"+ end=+\*/+me=s-1 contains=cSpecial,cCommentSkip
  syntax region cComment2String	contained start=+L\="+ skip=+\\\\\|\\"+ end=+"+ end="$" contains=cSpecial
  syntax region  cCommentL	start="//" skip="\\$" end="$" keepend contains=@cCommentGroup,cComment2String,cCharacter,cNumbersCom,cSpaceError
  syntax region cComment	matchgroup=cCommentStart start="/\*" matchgroup=NONE end="\*/" contains=@cCommentGroup,cCommentStartError,cCommentString,cCharacter,cNumbersCom,cSpaceError
else
  syn region	cCommentL	start="//" skip="\\$" end="$" keepend contains=@cCommentGroup,cSpaceError
  syn region	cComment	matchgroup=cCommentStart start="/\*" matchgroup=NONE end="\*/" contains=@cCommentGroup,cCommentStartError,cSpaceError
endif
" keep a // comment separately, it terminates a preproc. conditional
syntax match	cCommentError	display "\*/"
syntax match	cCommentStartError display "/\*"me=e-1 contained

syn keyword	cOperator	sizeof
if exists("c_gnu")
  syn keyword	cOperator	typeof __real__ __imag__
endif
syn keyword	cType		int long short char void
syn keyword	cType		signed unsigned float double
if !exists("c_no_ansi") || exists("c_ansi_typedefs")
  syn keyword   cType		size_t wchar_t ptrdiff_t sig_atomic_t fpos_t
  syn keyword   cType		clock_t time_t va_list jmp_buf FILE DIR div_t ldiv_t
endif
if exists("c_gnu")
  syn keyword	cType		__label__ __complex__
endif

syn keyword	cStructure	struct union enum typedef
syn keyword	cStorageClass	static register auto volatile extern const
if exists("c_gnu")
  syn keyword	cStorageClass	inline __attribute__
endif

if !exists("c_no_ansi") || exists("c_ansi_constants") || exists("c_gnu")
  if exists("c_gnu")
    syn keyword cConstant __GNUC__ __FUNCTION__ __PRETTY_FUNCTION__
  endif
  syn keyword cConstant __LINE__ __FILE__ __DATE__ __TIME__ __STDC__
  syn keyword cConstant __STDC_VERSION__
  syn keyword cConstant CHAR_BIT MB_LEN_MAX MB_CUR_MAX
  syn keyword cConstant UCHAR_MAX UINT_MAX ULONG_MAX USHRT_MAX
  syn keyword cConstant CHAR_MIN INT_MIN LONG_MIN SHRT_MIN
  syn keyword cConstant CHAR_MAX INT_MAX LONG_MAX SHRT_MAX
  syn keyword cConstant SCHAR_MIN SINT_MIN SLONG_MIN SSHRT_MIN
  syn keyword cConstant SCHAR_MAX SINT_MAX SLONG_MAX SSHRT_MAX
  syn keyword cConstant FLT_RADIX FLT_ROUNDS
  syn keyword cConstant FLT_DIG FLT_MANT_DIG FLT_EPSILON
  syn keyword cConstant DBL_DIG DBL_MANT_DIG DBL_EPSILON
  syn keyword cConstant LDBL_DIG LDBL_MANT_DIG LDBL_EPSILON
  syn keyword cConstant FLT_MIN FLT_MAX FLT_MIN_EXP FLT_MAX_EXP
  syn keyword cConstant FLT_MIN_10_EXP FLT_MAX_10_EXP
  syn keyword cConstant DBL_MIN DBL_MAX DBL_MIN_EXP DBL_MAX_EXP
  syn keyword cConstant DBL_MIN_10_EXP DBL_MAX_10_EXP
  syn keyword cConstant LDBL_MIN LDBL_MAX LDBL_MIN_EXP LDBL_MAX_EXP
  syn keyword cConstant LDBL_MIN_10_EXP LDBL_MAX_10_EXP
  syn keyword cConstant HUGE_VAL EDOM ERANGE CLOCKS_PER_SEC NULL
  syn keyword cConstant LC_ALL LC_COLLATE LC_CTYPE LC_MONETARY
  syn keyword cConstant LC_NUMERIC LC_TIME
  syn keyword cConstant SIG_DFL SIG_ERR SIG_IGN
  syn keyword cConstant SIGABRT SIGFPE SIGILL SIGHUP SIGINT SIGSEGV SIGTERM
  " Add POSIX signals as well...
  syn keyword cConstant SIGQUIT SIGTRAP SIGKILL SIGUSR1 SIGUSR2 SIGPIPE
  syn keyword cConstant SIGALRM SIGCHLD SIGCONT SIGSTOP SIGTSTP SIGTTIN SIGTTOU
  syn keyword cConstant _IOFBF _IOLBF _IONBF BUFSIZ EOF
  syn keyword cConstant FOPEN_MAX FILENAME_MAX L_tmpnam
  syn keyword cConstant SEEK_CUR SEEK_END SEEK_SET
  syn keyword cConstant TMP_MAX stderr stdin stdout
  syn keyword cConstant EXIT_FAILURE EXIT_SUCCESS RAND_MAX
  " math.h
  syn keyword cConstant M_E M_LOG2E M_LOG10E M_LN2 M_LN10 M_PI M_PI_2 M_PI_4
  syn keyword cConstant M_1_PI M_2_PI M_2_SQRTPI M_SQRT2 M_SQRT1_2
endif

syn region	cPreCondit	start="^\s*#\s*\(if\|ifdef\|ifndef\|elif\)\>" skip="\\$" end="$" end="//"me=s-1 contains=cComment,cCppString,cCharacter,cCppParen,cParenError,cNumbers,cCommentError,cSpaceError
syn match	cPreCondit	display "^\s*#\s*\(else\|endif\)\>"
if !exists("c_no_if0")
  syn region	cCppOut		start="^\s*#\s*if\s\+0\+\>" end=".\|$" contains=cCppOut2
  syn region	cCppOut2	contained start="0" end="^\s*#\s*\(endif\>\|else\>\|elif\>\)" contains=cSpaceError,cCppSkip
  syn region	cCppSkip	contained start="^\s*#\s*\(if\>\|ifdef\>\|ifndef\>\)" skip="\\$" end="^\s*#\s*endif\>" contains=cSpaceError,cCppSkip
endif
syn region	cIncluded	display contained start=+"+ skip=+\\\\\|\\"+ end=+"+
syn match	cIncluded	display contained "<[^>]*>"
syn match	cInclude	display "^\s*#\s*include\>\s*["<]" contains=cIncluded
"syn match cLineSkip	"\\$"
syn cluster	cPreProcGroup	contains=cPreCondit,cIncluded,cInclude,cDefine,cErrInParen,cErrInBracket,cUserLabel,cSpecial,cOctalZero,cCppOut,cCppOut2,cCppSkip,cFormat,cNumber,cFloat,cOctal,cOctalError,cNumbersCom,cString,cCommentSkip,cCommentString,cComment2String,@cCommentGroup,cCommentStartError,cParen,cBracket,cMulti
syn region	cDefine		start="^\s*#\s*\(define\|undef\)\>" skip="\\$" end="$" end="//"me=s-1 contains=ALLBUT,@cPreProcGroup
syn region	cPreProc	start="^\s*#\s*\(pragma\>\|line\>\|warning\>\|warn\>\|error\>\)" skip="\\$" end="$" keepend contains=ALLBUT,@cPreProcGroup

" Highlight User Labels
syn cluster	cMultiGroup	contains=cIncluded,cSpecial,cCommentSkip,cCommentString,cComment2String,@cCommentGroup,cCommentStartError,cUserCont,cUserLabel,cBitField,cOctalZero,cCppOut,cCppOut2,cCppSkip,cFormat,cNumber,cFloat,cOctal,cOctalError,cNumbersCom,cCppParen,cCppBracket,cCppString
syn region	cMulti		transparent start='?' skip='::' end=':' contains=ALLBUT,@cMultiGroup
" Avoid matching foo::bar() in C++ by requiring that the next char is not ':'
syn cluster	cLabelGroup	contains=cUserLabel
syn match	cUserCont	display "^\s*\I\i*\s*:$" contains=@cLabelGroup
syn match	cUserCont	display ";\s*\I\i*\s*:$" contains=@cLabelGroup
syn match	cUserCont	display "^\s*\I\i*\s*:[^:]"me=e-1 contains=@cLabelGroup
syn match	cUserCont	display ";\s*\I\i*\s*:[^:]"me=e-1 contains=@cLabelGroup

syn match	cUserLabel	display "\I\i*" contained

" Avoid recognizing most bitfields as labels
syn match	cBitField	display "^\s*\I\i*\s*:\s*[1-9]"me=e-1
syn match	cBitField	display ";\s*\I\i*\s*:\s*[1-9]"me=e-1

if exists("c_minlines")
  let b:c_minlines = c_minlines
else
  if !exists("c_no_if0")
    let b:c_minlines = 50	" #if 0 constructs can be long
  else
    let b:c_minlines = 15	" mostly for () constructs
  endif
endif
exec "syn sync ccomment cComment minlines=" . b:c_minlines

" Define the default highlighting.
" For version 5.7 and earlier: only when not done already
" For version 5.8 and later: only when an item doesn't have highlighting yet
if version >= 508 || !exists("did_c_syn_inits")
  if version < 508
    let did_c_syn_inits = 1
    command -nargs=+ HiLink hi link <args>
  else
    command -nargs=+ HiLink hi def link <args>
  endif

  HiLink cFormat		cSpecial
  HiLink cCppString		cString
  HiLink cCommentL		cComment
  HiLink cCommentStart		cComment
  HiLink cLabel			Label
  HiLink cUserLabel		Label
  HiLink cConditional		Conditional
  HiLink cRepeat		Repeat
  HiLink cCharacter		Character
  HiLink cSpecialCharacter	cSpecial
  HiLink cNumber		Number
  HiLink cOctal			Number
  HiLink cOctalZero		PreProc	 " link this to Error if you want
  HiLink cFloat			Float
  HiLink cOctalError		cError
  HiLink cParenError		cError
  HiLink cErrInParen		cError
  HiLink cErrInBracket		cError
  HiLink cCommentError		cError
  HiLink cCommentStartError	cError
  HiLink cSpaceError		cError
  HiLink cSpecialError		cError
  HiLink cOperator		Operator
  HiLink cStructure		Structure
  HiLink cStorageClass		StorageClass
  HiLink cInclude		Include
  HiLink cPreProc		PreProc
  HiLink cDefine		Macro
  HiLink cIncluded		cString
  HiLink cError			Error
  HiLink cStatement		Statement
  HiLink cPreCondit		PreCondit
  HiLink cType			Type
  HiLink cConstant		Constant
  HiLink cCommentString		cString
  HiLink cComment2String	cString
  HiLink cCommentSkip		cComment
  HiLink cString		String
  HiLink cComment		Comment
  HiLink cSpecial		SpecialChar
  HiLink cTodo			Todo
  HiLink cCppSkip		cCppOut
  HiLink cCppOut2		cCppOut
  HiLink cCppOut		Comment

  delcommand HiLink
endif

let b:current_syntax = "c"

" vim: ts=8
