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-@(#)FAQ 8.13 (Berkeley) 10/14/96
-
-Q: How can I get vi to display my character set?
-A: Vi uses the C library routine isprint(3) to determine if a character
- is printable, or should be displayed as an octal or hexadecimal value
- on the screen. Generally, if vi is displaying printable characters
- in octal/hexadecimal forms, your environment is not configured correctly.
- Try looking at the man pages that allow you to configure your locale.
- For example, to configure an ISO 8859-1 locale under Solaris using csh,
- you would do:
-
- setenv LANG C
- setenv LC_CTYPE iso_8859_1
-
- Other LC_CTYPE systems/values that I'm told work:
-
- System Value
- ====== =====
- FreeBSD lt_LN.ISO_8859-1
- HP-UX 9.X american.iso88591
- HP-UX 10.X en_US.iso88591
- SunOS 4.X iso_8859_1
- SunOS 5.X iso_8859_1
-
- If there's no other solution, you can use the print and noprint edit
- options of vi to specify that a specific character is printable or not
- printable.
-
-Q: My map won't work!
-A: One thing that you should immediately check if a vi map doesn't work
- is if depends on the final cursor position after a P or p command.
- Historic vi's were inconsistent as to the final position of the cursor,
- and, to make matter worse, the final cursor position also depended on
- whether the put text came from a named or unnamed buffer! Vi follows
- the POSIX 1003.2 standard on this one, and makes this consistent, always
- placing the cursor on the first character.
-
-Q: I'm using ksh or csh as my vi edit option shell value, and file
- expansions don't work right!
-A: The problem may be in your ksh or csh startup files, e.g., .cshrc. Vi
- executes the shell to do name expansion, and the shell generally reads
- its startup files. If the startup files are not correctly configured
- for non-interactive use, e.g., they always echo a prompt to the screen,
- vi will be unable to parse the output and things will not work
- correctly.
-
-Q: How does the iclower edit option differ from the ignorecase (i.e. ic)
- edit option?
-A: The difference is that the ignorecase edit option always ignores the
- case of letters in the Regular Expression (RE), and the iclower edit
- option only ignores the case if there are no upper-case letters in the
- RE. If any upper-case letters appear in the Regular Expression, then
- it will be treated case-sensitively, as if the ignorecase edit option
- was not set.
-
-Q: When I edit binary files, vi appends a <newline> to the last line!
-A: This is historic practice for vi, and further, it's required by the
- POSIX 1003.2 standard. My intent is to provide a command line and/or
- edit option to turn this behavior off when I switch to version 2.0 of
- the Berkeley DB package.
-
-Q: My cursor keys don't work when I'm in text input mode!
-A: A common problem over slow links is that the set of characters sent by
- the cursor keys don't arrive close enough together for vi to understand
- that they are a single keystroke, and not separate keystrokes. Try
- increasing the value of the escapetime edit option, which will cause
- vi to wait longer before deciding that the <escape> character that
- starts cursor key sequences doesn't have any characters following it.
-
-Q: When I edit some files, vi seems to hang forever, and I have to kill it.
-A: Vi uses flock(2) and fcntl(2) to do file locking. When it attempts to
- acquired a lock for a file on an NFS mounted filesystem, it can hang
- for a very long (perhaps infinite) period of time. Turning off the
- "lock" edit option will keep vi from attempting to acquire any locks
- on the files you edit.
-
-Q: When I compile vi I get lots of warnings about pointer assignments
- being incompatible!
-A: Vi is partially written to support wide characters. When this code
- interfaces with the code that doesn't yet support wide characters,
- the pointer types clash. This will hopefully be fixed in the near
- future, but I've been saying that for awhile, now.
-
-Q: I get jumpy scrolling behavior in the screen!
-A: This is almost certainly a problem with the system's terminfo or
- termcap information for your terminal. If the terminfo/termcap entry
- doesn't have the settable scrolling region capabilities, or the more
- powerful scrolling commands, these behaviors can result. Historic
- implementations of vi, and some of the vi clones, don't suffer from
- this problem because they wrote their own screen support instead of
- using the curses library.
-
- The solution is to find a good terminfo or termcap entry for your
- terminal, which will fix the problem for all of the applications on
- your system, not just vi. Eric Raymond maintains the freely
- redistributable termcap/terminfo entries. They can be downloaded
- from http://www.ccil.org/~esr/ncurses.html, or you can contact him
- at esr@snark.thyrsus.com.
-
-Q: The entire screen repaints on every keystroke!
-A: Your system's curses implementation is broken. You should use the
- curses implementation provided with vi or a curses replacement such
- as ncurses. Eric Raymond is one of the maintainers of the freely
- redistributable ncurses package. You can download ncurses from
- http://www.ccil.org/~esr/ncurses.html, or you can contact him at
- esr@snark.thyrsus.com.
-
-Q: When I use vi on a Sun console (terminal type sun-34) the screen
- is occasionally trashed, usually when exiting vi!
-A: The Sun console can't handle the 'al' capability of the termcap
- entry (the il1 capability of terminfo entries). If you delete that
- entry from your terminfo/termcap information everything should work
- correctly.
-
-Q: I don't have a version of ctags (or I have ctags, but it doesn't tag
- nearly enough things)!
-A: There's a version of ctags available on the 4.4BSD-Lite distributions,
- as well as the FreeBSD, NetBSD, Linux and GNU distributions. Or, you
- might want to try Exuberant Ctags:
-
- Title: Exuberant Ctags
- Version: 1.3
- Entered-date: 16JUN96
- Description:
- A better ctags which generates tags for all possible tag types:
- macro definitions, enumerated values (values inside enum{...}),
- function and method definitions, enum/struct/union tags, external
- function prototypes (optional), typedefs, and variable
- declarations. It is far less easily fooled by code containing #if
- preprocessor conditional constructs, using a conditional path
- selection algorithm to resolve complicated choices, and a
- fall-back algorithm when this one fails. Can also be used to print
- out a list of selected objects found in source files.
- Keywords: ctags, tags, exuberant
- Author: darren@sirsi.com (Darren Hiebert)
- darren@hiwaay.net (Darren Hiebert)
- Maintained-by: darren@sirsi.com (Darren Hiebert)
- darren@hiwaay.net (Darren Hiebert)
- Primary-site: sunsite.unc.edu /pub/Linux/devel/lang/c
- 27kB ctags-1.3.tar.gz
- Alternate-site: ftp.halcyon.com /local/gvr
- 27kB ctags-1.3.tar.gz
- Original-site:
- Platforms: UNIX, MSDOS, WindowsNT, Windows95, OS/2, Amiga
- Copying-policy: Public domain
-
-Q: When I update a file I already have open, and use :e to reread it, I
- get nul's for the rest of the file!
-A: Your system's implementation of mmap(2) has a bug; you will have to
- exit vi and re-execute it.
-
-Q: Where can I get cscope?
-A: Cscope is available on UNIXWare System V Release 4.0 variants such as
- Sun Solaris 2.x (/opt/SUNWspro/bin) and UNIXWare System V Release 4.1.
-
- You can buy version 13.3 source with an unrestricted license for $400
- from AT&T Software Solutions by calling +1-800-462-8146. Binary
- redistribution of cscope is an additional $1500, one-time flat fee.
-
- For more information, see http://www.unipress.com/att/new/cscope.html.