On Wed, 2 Mar 2016, The Doctor wrote:
Got a problem compiling this
This line
if (unsetenv(CS *name) < 0) return FALSE;
is prevent the compilation.
gcc environment.c
environment.c: In function `cleanup_environment':
environment.c:54: warning: cast to pointer from integer of different size
environment.c:54: void value not ignored as it ought to be
and
man unsetenv
GETENV(3) BSD Programmer's Manual GETENV(3)
NAME
getenv, putenv, setenv, unsetenv - environment variable functions
SYNOPSIS
#include <stdlib.h>
char *
getenv(const char *name);
int
setenv(const char *name, const char *value, int overwrite);
int
putenv(const char *string);
void
unsetenv(const char *name);
DESCRIPTION
These functions set, unset and fetch environment variables from the host
environment list. For compatibility with differing environment conven-
tions, the given arguments name and value may be appended and prepended,
respectively, with an equal sign ``=''.
The getenv() function obtains the current value of the environment vari-
able, name. If the variable name is not in the current environment, a
null pointer is returned.
The setenv() function inserts or resets the environment variable name in
the current environment list. If the variable name does not exist in the
list, it is inserted with the given value. If the variable does exist,
the argument overwrite is tested; if overwrite is zero, the variable is
not reset, otherwise it is reset to the given value.
The putenv() function takes an argument of the form ``name=value'' and is
equivalent to:
setenv(name, value, 1);
The unsetenv() function deletes all instances of the variable name point-
ed to by name from the list.
RETURN VALUES
The functions setenv() and putenv() return zero if successful; otherwise
the global variable errno is set to indicate the error and a -1 is re-
turned.
ERRORS
[ENOMEM] The function setenv() or putenv() failed because they were un-
able to allocate memory for the environment.
SEE ALSO
csh(1), sh(1), execve(2), environ(7)
STANDARDS
The getenv() function conforms to ANSI C X3.159-1989 (``ANSI C '').
Hmm. Looks like BSD and Linux differ:
SYNOPSIS
#include <stdlib.h>
int setenv(const char *name, const char *value, int overwrite);
int unsetenv(const char *name);
Feature Test Macro Requirements for glibc (see fea-
ture_test_macros(7)):
setenv(), unsetenv(): _BSD_SOURCE || _POSIX_C_SOURCE >= 200112L
|| _XOPEN_SOURCE >= 600
... ... ..
RETURN VALUE
The setenv() function returns zero on success, or -1 if there
was insufficient space in the environment.
The unsetenv() function returns zero on success, or -1 on error,
with errno set to indicate the cause of the error.
ERRORS
EINVAL name contained an '=' character.
CONFORMING TO
4.3BSD, POSIX.1-2001.
NOTES
POSIX.1-2001 does not require setenv() or unsetenv() to be reentrant.
Prior to glibc 2.2.2, unsetenv() was prototyped as returning void;
more recent glibc versions follow the POSIX.1-2001-compliant
prototype shown in the SYNOPSIS.
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