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Full Discussion: How on earth can zsh know whether it's starting at the beginning of a line or not?
Top Forums Programming How on earth can zsh know whether it's starting at the beginning of a line or not? Post 302413484 by pludi on Friday 16th of April 2010 12:54:20 AM
Old 04-16-2010
Quote:
Originally Posted by AdrienE
Very weirdly, there seems to exist no way to know the cursor position in a terminal without clearing it and keeping track of the cursor, which a shell obviously cannot do since it can't control the output of the programs it launches (that is why my theory that zsh uses ncurses doesn't seem to hold, although it is very possible that it uses some ncurses functions).
Really? I thought this is what the ^[[6n escape sequence was for? Besides:
Code:
$ which zsh
/usr/bin/zsh
$ ldd -r $( which zsh )
        linux-gate.so.1 =>  (0xffffe000)
        libcap.so.1 => /lib/libcap.so.1 (0xb7f6b000)
        libdl.so.2 => /lib/libdl.so.2 (0xb7f67000)
        libnsl.so.1 => /lib/libnsl.so.1 (0xb7f50000)
        libncurses.so.5 => /lib/libncurses.so.5 (0xb7f1b000)
        libm.so.6 => /lib/libm.so.6 (0xb7ef6000)
        libc.so.6 => /lib/libc.so.6 (0xb7dc3000)
        /lib/ld-linux.so.2 (0xb7f89000)
$ zsh --version
zsh 4.3.4 (i686-suse-linux-gnu)

Quote:
Originally Posted by AdrienE
I checked the zsh source code but I'm not used to doing such things, and besides, it's quite like looking for a needle in a haystack (even though I'm fairly confident the code is situated in the zle part)...
That makes it sound like you just started programming, and are thinking that writing your own shell can't be that hard, since there are so many around. Well, the source code for KSH93 (which has far less features that zsh) comes in at roughly 2.5 MiB of code, and that's not counting any supporting libraries from the same archive.
 

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LEARN ABOUT OPENSOLARIS

getusershell

getusershell(3C)					   Standard C Library Functions 					  getusershell(3C)

NAME

       getusershell, setusershell, endusershell - get legal user shells

SYNOPSIS

       #include <unistd.h>

       char *getusershell(void);

       void setusershell(void);

       void endusershell(void);

DESCRIPTION

       The  getusershell()  function  returns  a  pointer  to  a  legal  user  shell  as defined by the system manager in the file /etc/shells. If
       /etc/shells does not exist, the following locations of the standard system shells are used in its place:

	 /bin/bash		    /bin/csh
	 /bin/jsh		    /bin/ksh
	 /bin/ksh93		    /bin/pfcsh
	 /bin/pfksh		    /bin/pfsh
	 /bin/sh		    /bin/tcsh
	 /bin/zsh		    /sbin/jsh
	 /sbin/pfsh		    /sbin/sh
	 /usr/bin/bash		    /usr/bin/csh
	 /usr/bin/jsh		    /usr/bin/ksh
	 /usr/bin/ksh93 	    /usr/bin/pfcsh
	 /usr/bin/pfksh 	    /usr/bin/pfsh
	 /usr/bin/sh		    /usr/bin/tcsh
	 /usr/bin/zsh		    /usr/sfw/bin/zsh
	 /usr/xpg4/bin/sh

       The getusershell() function opens the file /etc/shells, if it exists, and returns the next entry in the list of shells.

       The setusershell() function rewinds the file or the list.

       The endusershell() function closes the file, frees any memory used by getusershell() and setusershell(), and rewinds the file /etc/shells.

RETURN VALUES

       The getusershell() function returns a null pointer on EOF.

BUGS

       All information is contained in memory that may be freed with a call to endusershell(), so it must be copied if it is to be saved.

NOTES

       Restricted shells should not be listed in /etc/shells.

SunOS 5.11							    1 Nov 2007							  getusershell(3C)
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