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Document preferred naming conventions
This documents the preferred conventions for naming files, structs, enums, typedefs and functions. Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
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Daniel P. Berrange
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HACKING
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@ -239,6 +239,86 @@ on the subject, on Richard Jones' guide to working with open source projects
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<http://people.redhat.com/rjones/how-to-supply-code-to-open-source-projects/>.
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Naming conventions
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==================
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When reading libvirt code, a number of different naming conventions will be
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evident due to various changes in thinking over the course of the project's
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lifetime. The conventions documented below should be followed when creating
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any entirely new files in libvirt. When working on existing files, while it is
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desirable to apply these conventions, keeping a consistent style with existing
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code in that particular file is generally more important. The overall guiding
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principal is that every file, enum, struct, function, macro and typedef name
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must have a 'vir' or 'VIR' prefix. All local scope variable names are exempt,
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and global variables are exempt, unless exported in a header file.
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*File names*
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File naming varies depending on the subdirectory. The preferred style is to
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have a 'vir' prefix, followed by a name which matches the name of the
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functions / objects inside the file. For example, a file containing an object
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'virHashtable' is stored in files 'virhashtable.c' and 'virhashtable.h'.
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Sometimes, methods which would otherwise be declared 'static' need to be
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exported for use by a test suite. For this purpose a second header file should
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be added with a suffix of 'priv', e.g. 'virhashtablepriv.h'. Use of
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underscores in file names is discouraged when using the 'vir' prefix style.
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The 'vir' prefix naming applies to src/util, src/rpc and tests/ directories.
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Most other directories do not follow this convention.
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*Enum type & field names*
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All enums should have a 'vir' prefix in their typedef name, and each following
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word should have its first letter in uppercase. The enum name should match the
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typedef name with a leading underscore. The enum member names should be in all
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uppercase, and use an underscore to separate each word. The enum member name
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prefix should match the enum typedef name.
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typedef enum _virSocketType virSocketType;
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enum _virSocketType {
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VIR_SOCKET_TYPE_IPV4,
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VIR_SOCKET_TYPE_IPV6,
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};
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*Struct type names*
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All structs should have a 'vir' prefix in their typedef name, and each
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following word should have its first letter in uppercase. The struct name
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should be the same as the typedef name with a leading underscore. A second
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typedef should be given for a pointer to the struct with a 'Ptr' suffix.
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typedef struct _virHashTable virHashTable;
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typedef virHashTable *virHashTablePtr;
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struct _virHashTable {
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...
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};
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*Function names*
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All functions should have a 'vir' prefix in their name, followed by one or
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more words with first letter of each word capitalized. Underscores should not
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be used in function names. If the function is operating on an object, then the
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function name prefix should match the object typedef name, otherwise it should
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match the filename. Following this comes the verb / action name, and finally
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an optional subject name. For example, given an object 'virHashTable', all
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functions should have a name 'virHashTable$VERB' or
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'virHashTable$VERB$SUBJECT", e.g. 'virHashTableLookup' or
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'virHashTableGetValue'.
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*Macro names*
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All macros should have a "VIR" prefix in their name, followed by one or more
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uppercase words separated by underscores. The macro argument names should be
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in lowercase. Aside from having a "VIR" prefix there are no common practices
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for the rest of the macro name.
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Code indentation
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================
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Libvirt's C source code generally adheres to some basic code-formatting
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@ -314,6 +314,99 @@
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Richard Jones' guide to working with open source projects</a>.
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</p>
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<h2><a name="naming">Naming conventions</a></h2>
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<p>
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When reading libvirt code, a number of different naming conventions will
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be evident due to various changes in thinking over the course of the
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project's lifetime. The conventions documented below should be followed
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when creating any entirely new files in libvirt. When working on existing
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files, while it is desirable to apply these conventions, keeping a
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consistent style with existing code in that particular file is generally
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more important. The overall guiding principal is that every file, enum,
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struct, function, macro and typedef name must have a 'vir' or 'VIR' prefix.
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All local scope variable names are exempt, and global variables are exempt,
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unless exported in a header file.
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</p>
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<dl>
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<dt>File names</dt>
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<dd>
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<p>
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File naming varies depending on the subdirectory. The preferred
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style is to have a 'vir' prefix, followed by a name which matches
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the name of the functions / objects inside the file. For example,
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a file containing an object 'virHashtable' is stored in files
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'virhashtable.c' and 'virhashtable.h'. Sometimes, methods which
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would otherwise be declared 'static' need to be exported for use
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by a test suite. For this purpose a second header file should be
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added with a suffix of 'priv', e.g. 'virhashtablepriv.h'. Use of
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underscores in file names is discouraged when using the 'vir'
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prefix style. The 'vir' prefix naming applies to src/util,
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src/rpc and tests/ directories. Most other directories do not
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follow this convention.
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</p>
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</dd>
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<dt>Enum type & field names</dt>
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<dd>
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<p>
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All enums should have a 'vir' prefix in their typedef name,
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and each following word should have its first letter in
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uppercase. The enum name should match the typedef name with
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a leading underscore. The enum member names should be in all
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uppercase, and use an underscore to separate each word. The
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enum member name prefix should match the enum typedef name.
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</p>
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<pre>
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typedef enum _virSocketType virSocketType;
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enum _virSocketType {
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VIR_SOCKET_TYPE_IPV4,
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VIR_SOCKET_TYPE_IPV6,
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};</pre>
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</dd>
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<dt>Struct type names</dt>
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<dd>
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<p>
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All structs should have a 'vir' prefix in their typedef name,
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and each following word should have its first letter in
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uppercase. The struct name should be the same as the typedef
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name with a leading underscore. A second typedef should be
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given for a pointer to the struct with a 'Ptr' suffix.
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</p>
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<pre>
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typedef struct _virHashTable virHashTable;
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typedef virHashTable *virHashTablePtr;
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struct _virHashTable {
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...
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};</pre>
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</dd>
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<dt>Function names</dt>
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<dd>
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<p>
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All functions should have a 'vir' prefix in their name,
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followed by one or more words with first letter of each
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word capitalized. Underscores should not be used in function
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names. If the function is operating on an object, then the
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function name prefix should match the object typedef name,
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otherwise it should match the filename. Following this
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comes the verb / action name, and finally an optional
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subject name. For example, given an object 'virHashTable',
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all functions should have a name 'virHashTable$VERB' or
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'virHashTable$VERB$SUBJECT", e.g. 'virHashTableLookup'
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or 'virHashTableGetValue'.
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</p>
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</dd>
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<dt>Macro names</dt>
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<dd>
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<p>
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All macros should have a "VIR" prefix in their name, followed
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by one or more uppercase words separated by underscores. The
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macro argument names should be in lowercase. Aside from having
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a "VIR" prefix there are no common practices for the rest of
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the macro name.
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</p>
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</dd>
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</dl>
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<h2><a name="indent">Code indentation</a></h2>
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<p>
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@ -114,6 +114,10 @@ from docs/hacking.html.in!
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<xsl:template match="html:li/html:ul/html:li">-- <xsl:apply-templates/><xsl:value-of select="$newline"/><xsl:value-of select="$newline"/>
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</xsl:template>
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<xsl:template match="html:dl/html:dt">*<xsl:apply-templates/>*<xsl:value-of select="$newline"/><xsl:value-of select="$newline"/>
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</xsl:template>
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<xsl:template match="html:dl/html:dd"><xsl:apply-templates/><xsl:value-of select="$newline"/><xsl:value-of select="$newline"/>
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</xsl:template>
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<!-- add newline before nested <ul> -->
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