bug#23488: 25.0.93; Modules: inconsistent return types for error reporting

[Philipp Stephani]

Of the module environment functions, 'copy_string_contents' is
inconsistent with all the other functions in that it returns a boolean
to indicate success/failure.  All other functions only set the last
error status, to be checked with non_local_exit_check etc.  This should
be made consistent, e.g. my having copy_string_contents return void.

Furthermore, the comment for copy_string_contents is incorrect.  If
BUFFER is NULL, it returns true, not false.



In GNU Emacs 25.0.93.5 (x86_64-unknown-linux-gnu, GTK+ Version 3.10.8)
 of 2016-04-24 built on localhost
Repository revision: 0cd2e923dba8d8c7128b0c084ce6af22069e8db5
Windowing system distributor 'The X.Org Foundation', version 11.0.11501000
System Description:     Ubuntu 14.04 LTS

Configured using:
 'configure --with-modules'

Configured features:
XPM JPEG TIFF GIF PNG SOUND GSETTINGS NOTIFY FREETYPE XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 MODULES

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:

Load-path shadows:
None found.

Features:
(network-stream nsm starttls tls gnutls mailalias qp misearch
multi-isearch pp shadow sort mail-extr emacsbug message dired
format-spec rfc822 mml mml-sec epg epg-config mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader cus-edit
cus-start cus-load wid-edit thingatpt smtpmail auth-source cl-seq eieio
byte-opt bytecomp byte-compile cl-extra cconv eieio-core cl-macs gv
gnus-util password-cache sendmail rfc2047 rfc2045 ietf-drums mm-util
help-fns help-mode easymenu cl-loaddefs pcase cl-lib mail-prsvr
mail-utils time-date mule-util tooltip eldoc electric uniquify
ediff-hook vc-hooks lisp-float-type mwheel x-win term/common-win x-dnd
tool-bar dnd fontset image regexp-opt fringe tabulated-list newcomment
elisp-mode lisp-mode prog-mode register page menu-bar rfn-eshadow timer
select scroll-bar mouse jit-lock font-lock syntax facemenu font-core
frame cl-generic cham georgian utf-8-lang misc-lang vietnamese tibetan
thai tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek romanian
slovak czech european ethiopic indian cyrillic chinese charscript
case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote inotify dynamic-setting
system-font-setting font-render-setting move-toolbar gtk x-toolkit x
multi-tty make-network-process emacs)

Memory information:
((conses 16 122688 19896)
 (symbols 48 22745 0)
 (miscs 40 465 314)
 (strings 32 22646 4355)
 (string-bytes 1 663894)
 (vectors 16 22020)
 (vector-slots 8 1233705 213835)
 (floats 8 212 202)
 (intervals 56 622 15)
 (buffers 976 19)
 (heap 1024 55792 1609))

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