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glibc/nss/rewrite_field.c
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/* Copyright (C) 2015-2016 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 | |
<http://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 * | |
internal_function | |
__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; | |
} |