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  20 .\" Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
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  23 .TH HDRCHK 1ONBLD "Jul 02, 2008"
  24 .SH NAME
  25 hdrchk \- check that header files conform to ON standards
  26 .SH SYNOPSIS
  27 .nf
  28 \fBhdrchk\fR [\fB-a\fP] \fIfile\fR [\fIfile ...\fR]\fP
  29 .fi
  30 .SH DESCRIPTION
  31 .LP
  32 .I hdrchk
  33 verifies that C header files (*.h) conform to the standards of the ON
  34 consolidation.
  35 See HEADER STANDARDS for details.
  36 .SH OPTIONS
  37 .TP 10
  38 .B -a
  39 Apply (more lenient) application header rules.
  40 .SH HEADER STANDARDS
  41 .LP
  42 Standards for all header files:
  43 .TP 4
  44 .B 1.
  45 Begin with a comment containing a copyright message.
  46 .TP 4
  47 .B 2.
  48 Enclosed in a guard of the form:
  49 .LP
  50 .nf
  51         #ifndef GUARD
  52         #define GUARD
  53         #endif /* [!]GUARD */
  54 .fi
  55 .sp
  56 .RS 4n
  57 The preferred form is without the bang character, but either is
  58 acceptable.
  59 .RE
  60 .TP 4
  61 .B 3.
  62 Has a valid ident declaration.
  63 .LP
  64 Additional standards for system header files:
  65 .TP 4
  66 .B 1.
  67 The file guard must take the form '_\fBFILENAME\fP_H[_]', where
  68 \fBFILENAME\fP matches the basename of the file.
  69 If it is installed in a subdirectory, it should be of the
  70 form '_\fBDIR\fP_\fBFILENAME\fP_H[_]', though this is not currently enforced.
  71 The form without the trailing underscore is preferred in both cases.
  72 .TP 4
  73 .B 2.
  74 All #include directives must use the <> form.
  75 .TP 4
  76 .B 3.
  77 If the header file contains anything besides comments and preprocessor
  78 directives, then it must be enclosed in a C++ guard of the form:
  79 .LP
  80 .nf
  81         #ifdef __cplusplus
  82         extern "C" {
  83         #endif
  84 
  85         #ifdef __cplusplus
  86         }
  87         #endif
  88 .fi
  89