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-'\" t
-.\" Copyright 2002 walter harms (walter.harms@informatik.uni-oldenburg.de)
-.\"
-.\" SPDX-License-Identifier: GPL-1.0-or-later
-.\"
-.\" based on the description in glibc source and infopages
-.\"
-.\" Corrections and additions, aeb
-.TH envz_add 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-envz_add, envz_entry, envz_get, envz_merge,
-envz_remove, envz_strip \- environment string support
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <envz.h>
-.P
-.BI "error_t envz_add(char **restrict " envz ", size_t *restrict " envz_len ,
-.BI "               const char *restrict " name \
-", const char *restrict " value );
-.P
-.BI "char *envz_entry(const char *restrict " envz ", size_t " envz_len ,
-.BI "               const char *restrict " name );
-.P
-.BI "char *envz_get(const char *restrict " envz ", size_t " envz_len ,
-.BI "               const char *restrict " name );
-.P
-.BI "error_t envz_merge(char **restrict " envz ", size_t *restrict " envz_len ,
-.BI "               const char *restrict " envz2 ", size_t " envz2_len ,
-.BI "               int " override );
-.P
-.BI "void envz_remove(char **restrict " envz ", size_t *restrict " envz_len ,
-.BI "               const char *restrict " name );
-.P
-.BI "void envz_strip(char **restrict " envz ", size_t *restrict " envz_len );
-.fi
-.SH DESCRIPTION
-These functions are glibc-specific.
-.P
-An argz vector is a pointer to a character buffer together with a length,
-see
-.BR argz_add (3).
-An envz vector is a special argz vector, namely one where the strings
-have the form "name=value".
-Everything after the first \[aq]=\[aq] is considered
-to be the value.
-If there is no \[aq]=\[aq], the value is taken to be NULL.
-(While the value in case of a trailing \[aq]=\[aq] is the empty string "".)
-.P
-These functions are for handling envz vectors.
-.P
-.BR envz_add ()
-adds the string
-.RI \&" name = value \&"
-(in case
-.I value
-is non-NULL) or
-.RI \&" name \&"
-(in case
-.I value
-is NULL) to the envz vector
-.RI ( *envz ,\  *envz_len )
-and updates
-.I *envz
-and
-.IR *envz_len .
-If an entry with the same
-.I name
-existed, it is removed.
-.P
-.BR envz_entry ()
-looks for
-.I name
-in the envz vector
-.RI ( envz ,\  envz_len )
-and returns the entry if found, or NULL if not.
-.P
-.BR envz_get ()
-looks for
-.I name
-in the envz vector
-.RI ( envz ,\  envz_len )
-and returns the value if found, or NULL if not.
-(Note that the value can also be NULL, namely when there is
-an entry for
-.I name
-without \[aq]=\[aq] sign.)
-.P
-.BR envz_merge ()
-adds each entry in
-.I envz2
-to
-.IR *envz ,
-as if with
-.BR envz_add ().
-If
-.I override
-is true, then values in
-.I envz2
-will supersede those with the same name in
-.IR *envz ,
-otherwise not.
-.P
-.BR envz_remove ()
-removes the entry for
-.I name
-from
-.RI ( *envz ,\  *envz_len )
-if there was one.
-.P
-.BR envz_strip ()
-removes all entries with value NULL.
-.SH RETURN VALUE
-All envz functions that do memory allocation have a return type of
-.I error_t
-(an integer type),
-and return 0 for success, and
-.B ENOMEM
-if an allocation error occurs.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.na
-.nh
-.BR envz_add (),
-.BR envz_entry (),
-.BR envz_get (),
-.BR envz_merge (),
-.BR envz_remove (),
-.BR envz_strip ()
-T}	Thread safety	MT-Safe
-.TE
-.SH STANDARDS
-GNU.
-.SH EXAMPLES
-.\" SRC BEGIN (envz_add.c)
-.EX
-#include <envz.h>
-#include <stdio.h>
-#include <stdlib.h>
-\&
-int
-main(int argc, char *argv[], char *envp[])
-{
-    char    *str;
-    size_t  e_len = 0;
-\&
-    for (size_t i = 0; envp[i] != NULL; i++)
-        e_len += strlen(envp[i]) + 1;
-\&
-    str = envz_entry(*envp, e_len, "HOME");
-    printf("%s\en", str);
-    str = envz_get(*envp, e_len, "HOME");
-    printf("%s\en", str);
-    exit(EXIT_SUCCESS);
-}
-.EE
-.\" SRC END
-.SH SEE ALSO
-.BR argz_add (3)