diff options
Diffstat (limited to 'string/envz.c')
| -rw-r--r-- | string/envz.c | 172 |
1 files changed, 0 insertions, 172 deletions
diff --git a/string/envz.c b/string/envz.c deleted file mode 100644 index 02fb5cc28a..0000000000 --- a/string/envz.c +++ /dev/null @@ -1,172 +0,0 @@ -/* Routines for dealing with '\0' separated environment vectors - Copyright (C) 1995-2017 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Written by Miles Bader <miles@gnu.org> - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, see - <http://www.gnu.org/licenses/>. */ - -#include <malloc.h> -#include <string.h> - -#include <envz.h> - -/* The character separating names from values in an envz. */ -#define SEP '=' - -/* Returns a pointer to the entry in ENVZ for NAME, or 0 if there is none. - If NAME contains the separator character, only the portion before it is - used in the comparison. */ -char * -envz_entry (const char *envz, size_t envz_len, const char *name) -{ - while (envz_len) - { - const char *p = name; - const char *entry = envz; /* Start of this entry. */ - - /* See how far NAME and ENTRY match. */ - while (envz_len && *p == *envz && *p && *p != SEP) - p++, envz++, envz_len--; - - if ((*envz == '\0' || *envz == SEP) && (*p == '\0' || *p == SEP)) - /* Bingo! */ - return (char *) entry; - - /* No match, skip to the next entry. */ - while (envz_len && *envz) - envz++, envz_len--; - if (envz_len) - envz++, envz_len--; /* skip '\0' */ - } - - return 0; -} -libc_hidden_def (envz_entry) - -/* Returns a pointer to the value portion of the entry in ENVZ for NAME, or 0 - if there is none. */ -char * -envz_get (const char *envz, size_t envz_len, const char *name) -{ - char *entry = envz_entry (envz, envz_len, name); - if (entry) - { - while (*entry && *entry != SEP) - entry++; - if (*entry) - entry++; - else - entry = 0; /* A null entry. */ - } - return entry; -} - -/* Remove the entry for NAME from ENVZ & ENVZ_LEN, if any. */ -void -envz_remove (char **envz, size_t *envz_len, const char *name) -{ - char *entry = envz_entry (*envz, *envz_len, name); - if (entry) - argz_delete (envz, envz_len, entry); -} -libc_hidden_def (envz_remove) - -/* Adds an entry for NAME with value VALUE to ENVZ & ENVZ_LEN. If an entry - with the same name already exists in ENVZ, it is removed. If VALUE is - NULL, then the new entry will a special null one, for which envz_get will - return NULL, although envz_entry will still return an entry; this is handy - because when merging with another envz, the null entry can override an - entry in the other one. Null entries can be removed with envz_strip (). */ -error_t -envz_add (char **envz, size_t *envz_len, const char *name, const char *value) -{ - envz_remove (envz, envz_len, name); - - if (value) - /* Add the new value, if there is one. */ - { - size_t name_len = strlen (name); - size_t value_len = strlen (value); - size_t old_envz_len = *envz_len; - size_t new_envz_len = old_envz_len + name_len + 1 + value_len + 1; - char *new_envz = realloc (*envz, new_envz_len); - - if (new_envz) - { - memcpy (new_envz + old_envz_len, name, name_len); - new_envz[old_envz_len + name_len] = SEP; - memcpy (new_envz + old_envz_len + name_len + 1, value, value_len); - new_envz[new_envz_len - 1] = 0; - - *envz = new_envz; - *envz_len = new_envz_len; - - return 0; - } - else - return ENOMEM; - } - else - /* Add a null entry. */ - return __argz_add (envz, envz_len, name); -} - -/* Adds each entry in ENVZ2 to ENVZ & ENVZ_LEN, as if with envz_add(). If - OVERRIDE is true, then values in ENVZ2 will supersede those with the same - name in ENV, otherwise not. */ -error_t -envz_merge (char **envz, size_t *envz_len, const char *envz2, - size_t envz2_len, int override) -{ - error_t err = 0; - - while (envz2_len && ! err) - { - char *old = envz_entry (*envz, *envz_len, envz2); - size_t new_len = strlen (envz2) + 1; - - if (! old) - err = __argz_append (envz, envz_len, envz2, new_len); - else if (override) - { - argz_delete (envz, envz_len, old); - err = __argz_append (envz, envz_len, envz2, new_len); - } - - envz2 += new_len; - envz2_len -= new_len; - } - - return err; -} - -/* Remove null entries. */ -void -envz_strip (char **envz, size_t *envz_len) -{ - char *entry = *envz; - size_t left = *envz_len; - while (left) - { - size_t entry_len = strlen (entry) + 1; - left -= entry_len; - if (! strchr (entry, SEP)) - /* Null entry. */ - memmove (entry, entry + entry_len, left); - else - entry += entry_len; - } - *envz_len = entry - *envz; -} |