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27755: add "zsystem supports" to zsh/system

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Peter Stephenson 2010-02-25 11:15:26 +00:00
parent bec3de98df
commit a3b971a27e
3 changed files with 47 additions and 1 deletions
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7
ChangeLog
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@ -1,3 +1,8 @@
2010-02-25 Peter Stephenson <pws@csr.com>
* 27755: Doc/Zsh/mod_system.yo, Src/Modules/system.c:
add "zsystem supports" to test what zsystem supports.
2010-02-24 Peter Stephenson <p.w.stephenson@ntlworld.com>
* 27754: NEWS (unposted), Doc/Zsh/mod_system.yo, Src/exec.c,
@ -12819,5 +12824,5 @@
*****************************************************
* This is used by the shell to define $ZSH_PATCHLEVEL
* $Revision: 1.4914 $
* $Revision: 1.4915 $
*****************************************************

10
Doc/Zsh/mod_system.yo
View file

@ -148,6 +148,16 @@ If the option tt(-r) is given, the lock is only for reading, otherwise
it is for reading and writing. The file descriptor is opened
accordingly.
)
item(tt(zsystem supports) var(subcommand))(
The builtin tt(zsystem)'s subcommand tt(supports) tests whether a
given subcommand is supported. It returns status 0 if so, else
status 1. It operates silently unless there was a syntax error
(i.e. the wrong number of arguments), in which case status 255
is returned. Status 1 can indicate one of two things: var(subcommand)
is known but not supported by the current operating system, or
var(subcommand) is not known (possibly because this is an older
version of the shell before it was implemented).
)
enditem()
subsect(Parameters)

31
Src/Modules/system.c
View file

@ -491,6 +491,35 @@ bin_zsystem_flock(char *nam, char **args, UNUSED(Options ops), UNUSED(int func))
}
/*
* Return status zero if the zsystem feature is supported, else 1.
* Operates silently for future-proofing.
*/
/**/
static int
bin_zsystem_supports(char *nam, char **args,
UNUSED(Options ops), UNUSED(int func))
{
if (!args[0]) {
zwarnnam(nam, "supports: not enough arguments");
return 255;
}
if (args[1]) {
zwarnnam(nam, "supports: too many arguments");
return 255;
}
/* stupid but logically this should work... */
if (!strcmp(*args, "supports"))
return 0;
#ifdef HAVE_FCNTL_H
if (!strcmp(*args, "flock"))
return 0;
#endif
return 1;
}
/**/
static int
bin_zsystem(char *nam, char **args, Options ops, int func)
@ -498,6 +527,8 @@ bin_zsystem(char *nam, char **args, Options ops, int func)
/* If more commands are implemented, this can be more sophisticated */
if (!strcmp(*args, "flock")) {
return bin_zsystem_flock(nam, args+1, ops, func);
} else if (!strcmp(*args, "supports")) {
return bin_zsystem_supports(nam, args+1, ops, func);
}
zwarnnam(nam, "unknown subcommand: %s", *args);
return 1;