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f1531d0461
While working on PRs tui/30337 and cli/30346 I came across various notions of width in gdb, as reported by gdb, readline, curses and the environment variables. As for gdb, readline and the environment variables, the way things work is: - Gdb asks readline to detect screen size, - readline sets the actual screen size in the environment variables COLUMNS and LINES, - readline reports back a screen size to gdb, which may have one column less than the actual screen size, to deal with lack of auto-wrap. This becomes gdb's notion of screen size (in other words the point where we can expect the gdb command line to wrap), - Gdb then explicitly sets readline's screen size, which readline itself may adjust to deal with lack of auto-wrap. This becomes readlines notion of screen size (well, internally the unadjusted one, but it'll report back the adjusted one). Add a command "maint info screen" that prints these notions, both for width and height. For TERM=xterm we have: ... $ TERM=xterm gdb -ex "maint info screen" Number of characters gdb thinks are in a line is 118. Number of characters readline reports are in a line is 118. Number of characters curses thinks are in a line is 118. Number of characters environment thinks are in a line is 118 (COLUMNS). Number of lines gdb thinks are in a page is 27. Number of lines readline reports are in a page is 27. Number of lines curses thinks are in a page is 27. Number of lines environment thinks are in a page is 27 (LINES). ... And for TERM=ansi: ... $ TERM=ansi gdb -ex "maint info screen" Number of characters gdb thinks are in a line is 117. Number of characters readline reports are in a line is 116. Number of characters curses thinks are in a line is 118. Number of characters environment thinks are in a line is 118 (COLUMNS). Number of lines gdb thinks are in a page is 27. Number of lines readline reports are in a page is 27. Number of lines curses thinks are in a page is 27. Number of lines environment thinks are in a page is 27 (LINES). ... [ The fact that we have "characters readline reports are in a line is 116" is is due to gdb making readline adjust twice for the lack of auto-wrap, this is PR cli/30346. Likewise we can detect tui/30337 by doing a resize in TUI mode and doing "maint info screen": ... Number of characters characters curses thinks are in a line is 110. Number of characters environment thinks are in a line is 111 (COLUMNS). ] And for TERM=ansi, with width and heigth set to 0: ... Number of characters gdb thinks are in a line is 4294967295 (unlimited). Number of characters readline reports are in a line is 32766 (unlimited - 1). Number of characters curses thinks are in a line is 118. Number of characters environment thinks are in a line is 118 (COLUMNS). Number of lines gdb thinks are in a page is 4294967295 (unlimited). Number of lines readline reports are in a page is 32767 (unlimited). Number of lines curses thinks are in a page is 27. Number of lines environment thinks are in a page is 27 (LINES). ... [ Note that when doing a resize by say maximizing or de-maximizing a terminal, all reported values are updated, except for curses when not in TUI mode. Maybe that means there's a bug. If not, then maybe we should not print the curses lines unless in TUI mode, or annotate those lines such that it's clear that the values may be not up-to-date. ] I'd like to use this command in the regression test for PR cli/30346. Tested on x86_64-linux. Reviewed-By: Eli Zaretskii <eliz@gnu.org> Reviewed-By: Tom Tromey <tom@tromey.com> |
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| contrib | ||
| cpu | ||
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| etc | ||
| gas | ||
| gdb | ||
| gdbserver | ||
| gdbsupport | ||
| gnulib | ||
| gold | ||
| gprof | ||
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| include | ||
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| ld | ||
| libbacktrace | ||
| libctf | ||
| libdecnumber | ||
| libiberty | ||
| libsframe | ||
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| readline | ||
| sim | ||
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| zlib | ||
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| ar-lib | ||
| ChangeLog | ||
| compile | ||
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| configure | ||
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| libtool.m4 | ||
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| ltmain.sh | ||
| ltoptions.m4 | ||
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| MAINTAINERS | ||
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| missing | ||
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| multilib.am | ||
| README | ||
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README for GNU development tools This directory contains various GNU compilers, assemblers, linkers, debuggers, etc., plus their support routines, definitions, and documentation. If you are receiving this as part of a GDB release, see the file gdb/README. If with a binutils release, see binutils/README; if with a libg++ release, see libg++/README, etc. That'll give you info about this package -- supported targets, how to use it, how to report bugs, etc. It is now possible to automatically configure and build a variety of tools with one command. To build all of the tools contained herein, run the ``configure'' script here, e.g.: ./configure make To install them (by default in /usr/local/bin, /usr/local/lib, etc), then do: make install (If the configure script can't determine your type of computer, give it the name as an argument, for instance ``./configure sun4''. You can use the script ``config.sub'' to test whether a name is recognized; if it is, config.sub translates it to a triplet specifying CPU, vendor, and OS.) If you have more than one compiler on your system, it is often best to explicitly set CC in the environment before running configure, and to also set CC when running make. For example (assuming sh/bash/ksh): CC=gcc ./configure make A similar example using csh: setenv CC gcc ./configure make Much of the code and documentation enclosed is copyright by the Free Software Foundation, Inc. See the file COPYING or COPYING.LIB in the various directories, for a description of the GNU General Public License terms under which you can copy the files. REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info on where and how to report problems.