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Audit env(1)

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1) Shorten synopsis and reflect this in the manual
2) Use argv0 in usage()
3) Decrement argc in argv-loop for consistency
4) Make it clearer which error-code results from which errno in enprintf
5) Use idiomatic for-loop also for environ. Don't increment these pointers
   in the loop itself!
This commit is contained in:
FRIGN 2015-03-02 14:50:43 +01:00
parent 933ed8c00b
commit 27656a0cbc
3 changed files with 14 additions and 14 deletions
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2
README
View File

@ -27,7 +27,7 @@ The following tools are implemented ('*' == finished, '#' == UTF-8 support,
=*| dirname yes none
=* du yes none
=*| echo yes none
=* env yes none
=*| env yes none
#* expand yes none
#* expr yes none
=*| false yes none

16
env.1
View File

@ -1,4 +1,4 @@
.Dd January 24, 2015
.Dd March 1, 2015
.Dt ENV 1
.Os sbase
.Sh NAME
@ -7,15 +7,15 @@
.Sh SYNOPSIS
.Nm
.Op Fl i
.Oo Fl u Ar variable Oc ...
.Oo Ar variable Ns = Ns Ar value Oc ...
.Oo Fl u Ar var Oc ...
.Oo Ar var Ns = Ns Ar value Oc ...
.Oo Ar cmd Oo arg ... Oc Oc
.Sh DESCRIPTION
.Nm
unsets each
.Ar variable ,
.Ar var ,
then adds or sets each
.Ar ( variable , value )
.Ar ( var , value )
tuple in the environment.
.Pp
If
@ -28,11 +28,11 @@ otherwise, the modified environment is printed to stdout.
Completely ignore the existing environment and execute
.Ar cmd
only with each
.Ar ( variable , value )
.Ar ( var , value )
tuple specified.
.It Fl u Ar variable
.It Fl u Ar var
Unset
.Ar variable
.Ar var
in the environment.
.El
.Sh SEE ALSO

10
env.c
View File

@ -12,7 +12,7 @@ extern char **environ;
static void
usage(void)
{
eprintf("usage: env [-i] [-u variable] ... [variable=value] ... [cmd [arg ...]]\n");
eprintf("usage: %s [-i] [-u var] ... [var=value] ... [cmd [arg ...]]\n", argv0);
}
int
@ -30,16 +30,16 @@ main(int argc, char *argv[])
usage();
} ARGEND;
for (; *argv && strchr(*argv, '='); argv++)
for (; *argv && strchr(*argv, '='); argc--, argv++)
putenv(*argv);
if (*argv) {
execvp(*argv, argv);
enprintf(127 - (errno != EEXIST), "env: '%s':", *argv);
enprintf(126 + (errno == EEXIST), "execvp: %s:", *argv);
}
while (environ && *environ)
printf("%s\n", *environ++);
for (; environ && *environ; environ++)
puts(*environ);
return 0;
}