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author | Tim Potter <tpot@samba.org> | 2001-11-14 01:34:34 +0000 |
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committer | Tim Potter <tpot@samba.org> | 2001-11-14 01:34:34 +0000 |
commit | dc6688ab95148b70ae65bdd0d9caac95f57d6aee (patch) | |
tree | 0f3f4f19477eee0430583cd451d439ee7f77580b /source3/CodingSuggestions | |
parent | 6bf5caff8b352383a07802601103994427a4422f (diff) | |
download | samba-dc6688ab95148b70ae65bdd0d9caac95f57d6aee.tar.gz samba-dc6688ab95148b70ae65bdd0d9caac95f57d6aee.tar.bz2 samba-dc6688ab95148b70ae65bdd0d9caac95f57d6aee.zip |
Reformatted to 75 columns.
Converted from DOS CRLF format (hmm).
Added suggestion about C vs C++ comments.
(This used to be commit 104899391cf75017ef8d14416e4558e81723d702)
Diffstat (limited to 'source3/CodingSuggestions')
-rw-r--r-- | source3/CodingSuggestions | 200 |
1 files changed, 114 insertions, 86 deletions
diff --git a/source3/CodingSuggestions b/source3/CodingSuggestions index cefbf01ccd..aa19c16d85 100644 --- a/source3/CodingSuggestions +++ b/source3/CodingSuggestions @@ -1,86 +1,114 @@ -So you want to add code to Samba ...
-
-One of the daunting tasks facing a programmer attempting to write code for
-Samba is understanding the various coding conventions used by those most
-active in the project. These conventions were mostly unwritten and helped
-improve either the portability, stability or consistency of the code. This
-document will attempt to document a few of the more important coding practices
-used at this time on the Samba project. The coding practices are expected to
-change slightly over time, and even to grow as more is learned about obscure
-portability considerations. Two existing documents samba/source/internals.doc
-and samba/source/architecture.doc provide additional information.
-
-The loosely related question of coding style is very personal and this document
-does not attempt to address that subject, except to say that I have observed
-that eight character tabs seem to be preferred in Samba source. If you are
-interested in the topic of coding style, two oft-quoted documents are:
- http://lxr.linux.no/source/Documentation/CodingStyle and
- http://www.fsf.org/prep/standards_toc.html
-but note that coding style in Samba varies due to the many different programmers
-who have contributed.
-
-Following are some considerations you should use when adding new code to Samba.
-First and foremost remember that:
-
-Portability is a primary consideration in adding function, as is network
-compatability with de facto, existing, real world CIFS/SMB implementations.
-There are lots of platforms that Samba builds on so use caution when adding
-a call to a library function that is not invoked in existing Samba code. Also
-note that there are many quite different SMB/CIFS clients that Samba tries
-to support, not all of which follow the SNIA CIFS Technical Reference (or the
-earlier Microsoft reference documents or the X/Open book on the SMB Standard)
-perfectly.
-
-Here are some other suggestions:
-1) use d_printf instead of printf for display text
- reason: enable auto-substitution of translated language text
-2) use SAFE_FREE instead of free
- reason: reduce traps due to null pointers
-3) don't use bzero use memset, or ZERO_STRUCT and ZERO_STRUCTP macros
- reason: not POSIX
-4) don't use strcpy and strlen (use safe_* equivalents)
- reason: to avoid traps due to buffer overruns
-5) don't use getopt_long, use popt functions instead
- reason: portability
-6) explicitly add const qualifiers on parm passing in functions where
-parm is input only (somewhat controversial but const can be #defined away)
-8) discourage use of threads
- reason: portability (also see architecture.doc)
-9) don't explicitly include new header files in C files - new h files
-should be included by adding them once to includes.h
- reason: consistency
-10) don't explicitly extern functions (they are autogenerated by
-"make proto" into proto.h)
- reason: consistency
-11) use endian safe macros when unpacking SMBs (see byteorder.h and internals.doc)
- reason: not everyone uses Intel
-12) Note Unicode implications of charset handling (see internals.doc). See
-pull_* and push_* and convert_string functions.
- reason: Internationalization
-13) Don't assume English only
- reason: See above
-14) Try to avoid using in/out parameters (functions that return data which
-overwrites input parameters)
- reason: Can cause stability problems
-15) Ensure copyright notices are correct, don't append Tridge's name to code
-that he didn't write. If you did not write the code, make sure that it can
-coexist with the rest of the Samba GPLed code.
-16) Consider usage of DATA_BLOBs for length specified byte-data.
- reason: stability
-17) Take advantage of tdbs for database like function
- reason: consistency
-18) Don't access the SAM_ACCOUNT structure directly, they should be accessed
-via pdb_get...() and pdb_set...() functions.
- reason: stability, consistency
-19) Don't check a password directly against the passdb, always use the
-check_password() interface.
- reason: long term pluggability
-20) Try to use asprintf rather than pstrings and fstrings where possible
-
-
-The suggestions above are simply that, suggestions, but the information may
-help in reducing the routine rework done on new code. The preceeding list
-is expected to change routinely as new support routines and macros are added.
-
-
-Written by Steve French, with contributions from Simo Sorce and Andrew Bartlett.
\ No newline at end of file +So you want to add code to Samba ... + +One of the daunting tasks facing a programmer attempting to write code for +Samba is understanding the various coding conventions used by those most +active in the project. These conventions were mostly unwritten and helped +improve either the portability, stability or consistency of the code. This +document will attempt to document a few of the more important coding +practices used at this time on the Samba project. The coding practices are +expected to change slightly over time, and even to grow as more is learned +about obscure portability considerations. Two existing documents +samba/source/internals.doc and samba/source/architecture.doc provide +additional information. + +The loosely related question of coding style is very personal and this +document does not attempt to address that subject, except to say that I +have observed that eight character tabs seem to be preferred in Samba +source. If you are interested in the topic of coding style, two oft-quoted +documents are: + + http://lxr.linux.no/source/Documentation/CodingStyle + http://www.fsf.org/prep/standards_toc.html + +but note that coding style in Samba varies due to the many different +programmers who have contributed. + +Following are some considerations you should use when adding new code to +Samba. First and foremost remember that: + +Portability is a primary consideration in adding function, as is network +compatability with de facto, existing, real world CIFS/SMB implementations. +There are lots of platforms that Samba builds on so use caution when adding +a call to a library function that is not invoked in existing Samba code. +Also note that there are many quite different SMB/CIFS clients that Samba +tries to support, not all of which follow the SNIA CIFS Technical Reference +(or the earlier Microsoft reference documents or the X/Open book on the SMB +Standard) perfectly. + +Here are some other suggestions: + +1) use d_printf instead of printf for display text + reason: enable auto-substitution of translated language text + +2) use SAFE_FREE instead of free + reason: reduce traps due to null pointers + +3) don't use bzero use memset, or ZERO_STRUCT and ZERO_STRUCTP macros + reason: not POSIX + +4) don't use strcpy and strlen (use safe_* equivalents) + reason: to avoid traps due to buffer overruns + +5) don't use getopt_long, use popt functions instead + reason: portability + +6) explicitly add const qualifiers on parm passing in functions where parm + is input only (somewhat controversial but const can be #defined away) + +8) discourage use of threads + reason: portability (also see architecture.doc) + +9) don't explicitly include new header files in C files - new h files + should be included by adding them once to includes.h + reason: consistency + +10) don't explicitly extern functions (they are autogenerated by + "make proto" into proto.h) + reason: consistency + +11) use endian safe macros when unpacking SMBs (see byteorder.h and + internals.doc) + reason: not everyone uses Intel + +12) Note Unicode implications of charset handling (see internals.doc). See + pull_* and push_* and convert_string functions. + reason: Internationalization + +13) Don't assume English only + reason: See above + +14) Try to avoid using in/out parameters (functions that return data which + overwrites input parameters) + reason: Can cause stability problems + +15) Ensure copyright notices are correct, don't append Tridge's name to code + that he didn't write. If you did not write the code, make sure that it + can coexist with the rest of the Samba GPLed code. + +16) Consider usage of DATA_BLOBs for length specified byte-data. + reason: stability + +17) Take advantage of tdbs for database like function + reason: consistency + +18) Don't access the SAM_ACCOUNT structure directly, they should be accessed + via pdb_get...() and pdb_set...() functions. + reason: stability, consistency + +19) Don't check a password directly against the passdb, always use the + check_password() interface. + reason: long term pluggability + +20) Try to use asprintf rather than pstrings and fstrings where possible + +21) Use normal C comments /* like this */ instead of C++ comments // like + this. Although the C++ comment format is part of the C99 standard, + some older vendor C compilers do not accept it. + +The suggestions above are simply that, suggestions, but the information may +help in reducing the routine rework done on new code. The preceeding list +is expected to change routinely as new support routines and macros are +added. + +Written by Steve French, with contributions from Simo Sorce and Andrew +Bartlett. |