Lexical Notes

The following conventions are used in the specification.

• Comments begin with /* and end with */.

• White space serves to separate items and is otherwise ignored.

• An identifier is a letter followed by an optional sequence of letters, digits, or underbars (_). The case of identifiers is not ignored.

• A constant is a sequence of one or more decimal digits, optionally preceded by a minus sign (-), as seen in the following code example.

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  Example C–1 XDR Specification

  
  

  Syntax Information
  declaration:
  	type-specifier identifier
  	| type-specifier identifier "[" value "]"
  	| type-specifier identifier "<" [ value ] ">"
  	| "opaque" identifier "[" value "]"
  	| "opaque" identifier "<" [ value ] ">"
  	| "string" identifier "<" [ value ] ">"
  	| type-specifier "*" identifier
  	| "void"
  
  value:
  	constant
  	| identifier
  
  type-specifier:
  	 [ "unsigned" ] "int"
  	| [ "unsigned" ] "hyper"
  	| "float"
  	| "double"
  	| "quadruple"
  	| "bool"
  	| enum-type-spec
  	| struct-type-spec
  	| union-type-spec
  	| identifier
  
  enum-type-spec:
  	"enum" enum-body
  
  enum-body:
  	"{"
  	( identifier "=" value )
  	( "," identifier "=" value )*
  	"}"
  
  struct-type-spec:
  	"struct" struct-body
  
  struct-body:
  	"{"
  	( declaration ";" )
  	( declaration ";" )*
  	"}"
  
   union-type-spec:
  	"union" union-body
  
  union-body:
  	"switch" "(" declaration ")" "{"
  	( "case" value ":" declaration ";" )
  	( "case" value ":" declaration ";" )*
  	[ "default" ":" declaration ";" ]
  	"}"
  
  constant-def:
  	"const" identifier "=" constant ";"
  
  type-def:
  	"typedef" declaration ";"
  	| "enum" identifier enum-body ";"
  	| "struct" identifier struct-body ";"
  	| "union" identifier union-body ";"
  
  definition:
  	type-def
  	| constant-def
  
  specification:
  	definition *

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