On 2/28/12 4:17 AM, lhun...@lyndir.com wrote:
> Configuration Information [Automatically generated, do not change]:
> Machine: i386
> OS: darwin11.2.0
> Compiler: /Developer/usr/bin/clang
> Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='i386'
> -DCONF_OSTYPE='darwin11.2.0' -DCONF_MACHTYPE='i386-apple-darwin11.2.0'
> -DCONF_VENDOR='apple' -DLOCALEDIR='/opt/local/share/locale' -DPACKAGE='bash'
> -DSHELL -DHAVE_CONFIG_H -DMACOSX -I. -I. -I./include -I./lib
> -I/opt/local/include -pipe -O2 -arch x86_64
> uname output: Darwin mbillemo.lin-k.net 11.3.0 Darwin Kernel Version 11.3.0:
> Thu Jan 12 18:47:41 PST 2012; root:xnu-1699.24.23~1/RELEASE_X86_64 x86_64
> Machine Type: i386-apple-darwin11.2.0
>
> Bash Version: 4.2
> Patch Level: 20
> Release Status: release
>
> Description:
> The handling of backslash and quotes is completely inconsistent,
> counter-intuitive and in violation of how the syntax works elsewhere in bash.
>
> ' appears to introduce a single-quoted context and \ appears to escape
> special characters. That's good.
> A substitution pattern of ' causes bash to be unable to find the closing
> quote. That's good.
> A substitution pattern of '' SHOULD equal an empty quoted string. The
> result, however, is ''. That's NOT good. Suddenly the quotes are literal?
> A substitution pattern of '$var' SHOULD disable expansion inside the
> quotes. The result, however, is '[contents-of-var]'. That's NOT good. In
> fact, it looks like quoting doesn't work here at all.
> \\ is a disabled backslash, and the syntactical backslash is removed.
> The result is \. That's good.
> \' is a disabled single quote, but the syntactical backslash is NOT
> removed. The result is \'. That's NOT good.
>
> It mostly looks like all the rules for handling quoting and escaping are
> out the window and some random and utterly inconsistent set of rules is being
> applied instead.
>
> Fix:
> Change parsing of the substitution pattern so that it abides by all the
> standard documented rules regarding quotes and escaping.
It would go better if you gave some examples of what you consider
incorrect behavior. This description isn't helpful as it stands.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU c...@case.edu http://cnswww.cns.cwru.edu/~chet/
