| \input texinfo @c -*-texinfo-*- |
| @c %**start of header |
| @setfilename libiberty.info |
| @settitle @sc{gnu} libiberty |
| @c %**end of header |
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| @syncodeindex fn cp |
| @syncodeindex vr cp |
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| @finalout |
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| @dircategory GNU libraries |
| @direntry |
| * Libiberty: (libiberty). Library of utility functions which |
| are missing or broken on some systems. |
| @end direntry |
| |
| @macro libib |
| @code{libiberty} |
| @end macro |
| |
| @ifinfo |
| This manual describes the GNU @libib library of utility subroutines. |
| |
| Copyright @copyright{} 2001-2019 Free Software Foundation, Inc. |
| |
| Permission is granted to copy, distribute and/or modify this document |
| under the terms of the GNU Free Documentation License, Version 1.3 |
| or any later version published by the Free Software Foundation; |
| with no Invariant Sections, with no Front-Cover Texts, and with no |
| Back-Cover Texts. A copy of the license is included in the |
| section entitled ``GNU Free Documentation License''. |
| |
| @ignore |
| Permission is granted to process this file through TeX and print the |
| results, provided the printed document carries a copying permission |
| notice identical to this one except for the removal of this paragraph |
| (this paragraph not being relevant to the printed manual). |
| |
| @end ignore |
| @end ifinfo |
| |
| |
| @titlepage |
| @title @sc{gnu} libiberty |
| @author Phil Edwards et al. |
| @page |
| |
| |
| @vskip 0pt plus 1filll |
| Copyright @copyright{} 2001-2019 Free Software Foundation, Inc. |
| |
| Permission is granted to copy, distribute and/or modify this document |
| under the terms of the GNU Free Documentation License, Version 1.3 |
| or any later version published by the Free Software Foundation; |
| with no Invariant Sections, with no Front-Cover Texts, and with no |
| Back-Cover Texts. A copy of the license is included in the |
| section entitled ``GNU Free Documentation License''. |
| |
| @end titlepage |
| @contents |
| @page |
| |
| @ifnottex |
| @node Top,Using,, |
| @top Introduction |
| |
| The @libib{} library is a collection of subroutines used by various |
| GNU programs. It is available under the Library General Public |
| License; for more information, see @ref{Library Copying}. |
| |
| @end ifnottex |
| |
| @menu |
| * Using:: How to use libiberty in your code. |
| |
| * Overview:: Overview of available function groups. |
| |
| * Functions:: Available functions, macros, and global variables. |
| |
| * Licenses:: The various licenses under which libiberty sources are |
| distributed. |
| |
| * Index:: Index of functions and categories. |
| @end menu |
| |
| @node Using |
| @chapter Using |
| @cindex using libiberty |
| @cindex libiberty usage |
| @cindex how to use |
| |
| @c THIS SECTION IS CRAP AND NEEDS REWRITING BADLY. |
| |
| To date, @libib{} is generally not installed on its own. It has evolved |
| over years but does not have its own version number nor release schedule. |
| |
| Possibly the easiest way to use @libib{} in your projects is to drop the |
| @libib{} code into your project's sources, and to build the library along |
| with your own sources; the library would then be linked in at the end. This |
| prevents any possible version mismatches with other copies of libiberty |
| elsewhere on the system. |
| |
| Passing @option{--enable-install-libiberty} to the @command{configure} |
| script when building @libib{} causes the header files and archive library |
| to be installed when @kbd{make install} is run. This option also takes |
| an (optional) argument to specify the installation location, in the same |
| manner as @option{--prefix}. |
| |
| For your own projects, an approach which offers stability and flexibility |
| is to include @libib{} with your code, but allow the end user to optionally |
| choose to use a previously-installed version instead. In this way the |
| user may choose (for example) to install @libib{} as part of GCC, and use |
| that version for all software built with that compiler. (This approach |
| has proven useful with software using the GNU @code{readline} library.) |
| |
| Making use of @libib{} code usually requires that you include one or more |
| header files from the @libib{} distribution. (They will be named as |
| necessary in the function descriptions.) At link time, you will need to |
| add @option{-liberty} to your link command invocation. |
| |
| |
| @node Overview |
| @chapter Overview |
| |
| Functions contained in @libib{} can be divided into three general categories. |
| |
| |
| @menu |
| * Supplemental Functions:: Providing functions which don't exist |
| on older operating systems. |
| |
| * Replacement Functions:: These functions are sometimes buggy or |
| unpredictable on some operating systems. |
| |
| * Extensions:: Functions which provide useful extensions |
| or safety wrappers around existing code. |
| @end menu |
| |
| @node Supplemental Functions |
| @section Supplemental Functions |
| @cindex supplemental functions |
| @cindex functions, supplemental |
| @cindex functions, missing |
| |
| Certain operating systems do not provide functions which have since |
| become standardized, or at least common. For example, the Single |
| Unix Specification Version 2 requires that the @code{basename} |
| function be provided, but an OS which predates that specification |
| might not have this function. This should not prevent well-written |
| code from running on such a system. |
| |
| Similarly, some functions exist only among a particular ``flavor'' |
| or ``family'' of operating systems. As an example, the @code{bzero} |
| function is often not present on systems outside the BSD-derived |
| family of systems. |
| |
| Many such functions are provided in @libib{}. They are quickly |
| listed here with little description, as systems which lack them |
| become less and less common. Each function @var{foo} is implemented |
| in @file{@var{foo}.c} but not declared in any @libib{} header file; more |
| comments and caveats for each function's implementation are often |
| available in the source file. Generally, the function can simply |
| be declared as @code{extern}. |
| |
| |
| |
| @node Replacement Functions |
| @section Replacement Functions |
| @cindex replacement functions |
| @cindex functions, replacement |
| |
| Some functions have extremely limited implementations on different |
| platforms. Other functions are tedious to use correctly; for example, |
| proper use of @code{malloc} calls for the return value to be checked and |
| appropriate action taken if memory has been exhausted. A group of |
| ``replacement functions'' is available in @libib{} to address these issues |
| for some of the most commonly used subroutines. |
| |
| All of these functions are declared in the @file{libiberty.h} header |
| file. Many of the implementations will use preprocessor macros set by |
| GNU Autoconf, if you decide to make use of that program. Some of these |
| functions may call one another. |
| |
| |
| @menu |
| * Memory Allocation:: Testing and handling failed memory |
| requests automatically. |
| * Exit Handlers:: Calling routines on program exit. |
| * Error Reporting:: Mapping errno and signal numbers to |
| more useful string formats. |
| @end menu |
| |
| @node Memory Allocation |
| @subsection Memory Allocation |
| @cindex memory allocation |
| |
| The functions beginning with the letter @samp{x} are wrappers around |
| standard functions; the functions provided by the system environment |
| are called and their results checked before the results are passed back |
| to client code. If the standard functions fail, these wrappers will |
| terminate the program. Thus, these versions can be used with impunity. |
| |
| |
| @node Exit Handlers |
| @subsection Exit Handlers |
| @cindex exit handlers |
| |
| The existence and implementation of the @code{atexit} routine varies |
| amongst the flavors of Unix. @libib{} provides an unvarying dependable |
| implementation via @code{xatexit} and @code{xexit}. |
| |
| |
| @node Error Reporting |
| @subsection Error Reporting |
| @cindex error reporting |
| |
| These are a set of routines to facilitate programming with the system |
| @code{errno} interface. The @libib{} source file @file{strerror.c} |
| contains a good deal of documentation for these functions. |
| |
| @c signal stuff |
| |
| |
| @node Extensions |
| @section Extensions |
| @cindex extensions |
| @cindex functions, extension |
| |
| @libib{} includes additional functionality above and beyond standard |
| functions, which has proven generically useful in GNU programs, such as |
| obstacks and regex. These functions are often copied from other |
| projects as they gain popularity, and are included here to provide a |
| central location from which to use, maintain, and distribute them. |
| |
| @menu |
| * Obstacks:: Stacks of arbitrary objects. |
| @end menu |
| |
| @c This is generated from the glibc manual using contrib/make-obstacks-texi.pl |
| @include obstacks.texi |
| |
| @node Functions |
| @chapter Function, Variable, and Macro Listing. |
| @include functions.texi |
| |
| @node Licenses |
| @appendix Licenses |
| |
| @menu |
| |
| * Library Copying:: The GNU Library General Public License |
| * BSD:: Regents of the University of California |
| |
| @end menu |
| |
| @c This takes care of Library Copying. It is the copying-lib.texi from the |
| @c GNU web site, with its @node line altered to make makeinfo shut up. |
| @include copying-lib.texi |
| |
| @page |
| @node BSD |
| @appendixsec BSD |
| |
| Copyright @copyright{} 1990 Regents of the University of California. |
| All rights reserved. |
| |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions |
| are met: |
| |
| @enumerate |
| |
| @item |
| Redistributions of source code must retain the above copyright |
| notice, this list of conditions and the following disclaimer. |
| |
| @item |
| Redistributions in binary form must reproduce the above copyright |
| notice, this list of conditions and the following disclaimer in the |
| documentation and/or other materials provided with the distribution. |
| |
| @item |
| [rescinded 22 July 1999] |
| |
| @item |
| Neither the name of the University nor the names of its contributors |
| may be used to endorse or promote products derived from this software |
| without specific prior written permission. |
| |
| @end enumerate |
| |
| THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| SUCH DAMAGE. |
| |
| @node Index |
| @unnumbered Index |
| |
| @printindex cp |
| |
| @bye |
| |