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/* Routines for dealing with '\0' separated environment vectors
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Copyright (C) 1995-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Written by Miles Bader <miles@gnu.org>
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <malloc.h>
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#include <string.h>
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#include <envz.h>
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/* The character separating names from values in an envz. */
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#define SEP '='
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/* Returns a pointer to the entry in ENVZ for NAME, or 0 if there is none.
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If NAME contains the separator character, only the portion before it is
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used in the comparison. */
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char *
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envz_entry (const char *envz, size_t envz_len, const char *name)
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{
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while (envz_len)
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{
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const char *p = name;
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const char *entry = envz; /* Start of this entry. */
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/* See how far NAME and ENTRY match. */
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while (envz_len && *p == *envz && *p && *p != SEP)
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p++, envz++, envz_len--;
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if ((*envz == '\0' || *envz == SEP) && (*p == '\0' || *p == SEP))
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/* Bingo! */
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return (char *) entry;
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/* No match, skip to the next entry. */
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while (envz_len && *envz)
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envz++, envz_len--;
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if (envz_len)
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envz++, envz_len--; /* skip '\0' */
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}
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return 0;
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}
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libc_hidden_def (envz_entry)
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/* Returns a pointer to the value portion of the entry in ENVZ for NAME, or 0
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if there is none. */
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char *
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envz_get (const char *envz, size_t envz_len, const char *name)
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{
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char *entry = envz_entry (envz, envz_len, name);
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if (entry)
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{
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while (*entry && *entry != SEP)
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entry++;
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if (*entry)
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entry++;
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else
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entry = 0; /* A null entry. */
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}
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return entry;
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}
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/* Remove the entry for NAME from ENVZ & ENVZ_LEN, if any. */
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void
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envz_remove (char **envz, size_t *envz_len, const char *name)
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{
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char *entry = envz_entry (*envz, *envz_len, name);
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if (entry)
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argz_delete (envz, envz_len, entry);
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}
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libc_hidden_def (envz_remove)
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/* Adds an entry for NAME with value VALUE to ENVZ & ENVZ_LEN. If an entry
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with the same name already exists in ENVZ, it is removed. If VALUE is
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NULL, then the new entry will a special null one, for which envz_get will
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return NULL, although envz_entry will still return an entry; this is handy
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because when merging with another envz, the null entry can override an
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entry in the other one. Null entries can be removed with envz_strip (). */
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error_t
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envz_add (char **envz, size_t *envz_len, const char *name, const char *value)
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{
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envz_remove (envz, envz_len, name);
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if (value)
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/* Add the new value, if there is one. */
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{
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size_t name_len = strlen (name);
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size_t value_len = strlen (value);
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size_t old_envz_len = *envz_len;
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size_t new_envz_len = old_envz_len + name_len + 1 + value_len + 1;
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char *new_envz = realloc (*envz, new_envz_len);
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if (new_envz)
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{
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memcpy (new_envz + old_envz_len, name, name_len);
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new_envz[old_envz_len + name_len] = SEP;
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memcpy (new_envz + old_envz_len + name_len + 1, value, value_len);
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new_envz[new_envz_len - 1] = 0;
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*envz = new_envz;
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*envz_len = new_envz_len;
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return 0;
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}
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else
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return ENOMEM;
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}
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else
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/* Add a null entry. */
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return __argz_add (envz, envz_len, name);
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}
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/* Adds each entry in ENVZ2 to ENVZ & ENVZ_LEN, as if with envz_add(). If
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OVERRIDE is true, then values in ENVZ2 will supersede those with the same
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name in ENV, otherwise not. */
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error_t
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envz_merge (char **envz, size_t *envz_len, const char *envz2,
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size_t envz2_len, int override)
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{
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error_t err = 0;
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while (envz2_len && ! err)
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{
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char *old = envz_entry (*envz, *envz_len, envz2);
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size_t new_len = strlen (envz2) + 1;
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if (! old)
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err = __argz_append (envz, envz_len, envz2, new_len);
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else if (override)
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{
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argz_delete (envz, envz_len, old);
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err = __argz_append (envz, envz_len, envz2, new_len);
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}
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envz2 += new_len;
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envz2_len -= new_len;
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}
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return err;
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}
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/* Remove null entries. */
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void
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envz_strip (char **envz, size_t *envz_len)
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{
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char *entry = *envz;
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size_t left = *envz_len;
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while (left)
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{
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size_t entry_len = strlen (entry) + 1;
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left -= entry_len;
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if (! strchr (entry, SEP))
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/* Null entry. */
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memmove (entry, entry + entry_len, left);
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else
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entry += entry_len;
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}
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*envz_len = entry - *envz;
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}
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