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/* Copyright (C) 2015-2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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
<https://www.gnu.org/licenses/>. */
#include <nss.h>
#include <string.h>
/* Rewrite VALUE to a valid field value in the NSS database. Invalid
characters are replaced with a single space character ' '. If
VALUE is NULL, the empty string is returned. *TO_BE_FREED is
overwritten with a pointer the caller has to free if the function
returns successfully. On failure, return NULL. */
const char *
__nss_rewrite_field (const char *value, char **to_be_freed)
{
*to_be_freed = NULL;
if (value == NULL)
return "";
/* Search for non-allowed characters. */
const char *p = strpbrk (value, __nss_invalid_field_characters);
if (p == NULL)
return value;
*to_be_freed = __strdup (value);
if (*to_be_freed == NULL)
return NULL;
/* Switch pointer to freshly-allocated buffer. */
char *bad = *to_be_freed + (p - value);
do
{
*bad = ' ';
bad = strpbrk (bad + 1, __nss_invalid_field_characters);
}
while (bad != NULL);
return *to_be_freed;
}
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