mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-30 14:31:14 +00:00
0e1f068108
After commitf9c8b11ed7"nss: Access nss_files through direct references", when building with -Os, multiple conform/.../linknamespace tests and elf/check-localplt are failing: Extra PLT reference: libc.so: fgetc_unlocked Extra PLT reference: libc.so: getline Or e.g.: [initial] glob -> [libc.a(glob.o)] __getpwnam_r -> [libc.a(getpwnam_r.o)] __nss_database_custom -> [libc.a(nsswitch.o)] __nss_module_get_function -> [libc.a(nss_module.o)] __nss_files_functions -> [libc.a(nss_files_functions.o)] _nss_files_endaliasent -> [libc.a(files-alias.o)] feof_unlocked [initial] glob -> [libc.a(glob.o)] __getpwnam_r -> [libc.a(getpwnam_r.o)] __nss_database_custom -> [libc.a(nsswitch.o)] __nss_module_get_function -> [libc.a(nss_module.o)] __nss_files_functions -> [libc.a(nss_files_functions.o)] _nss_files_endaliasent -> [libc.a(files-alias.o)] fgetc_unlocked [initial] glob -> [libc.a(glob.o)] __getpwnam_r -> [libc.a(getpwnam_r.o)] __nss_database_custom -> [libc.a(nsswitch.o)] __nss_module_get_function -> [libc.a(nss_module.o)] __nss_files_functions -> [libc.a(nss_files_functions.o)] _nss_files_endnetgrent -> [libc.a(files-netgrp.o)] getline This patch is using the hidden symbols where possible. Instead of fputc_unlocked, __putc_unlocked is used. (Compare to commiteeaa19f75e"mntent: Use __putc_unlocked instead of fputc_unlocked")
100 lines
2.8 KiB
C
100 lines
2.8 KiB
C
/* Read a line from an nss_files database file.
|
|
Copyright (C) 2020-2021 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_files.h>
|
|
|
|
#include <ctype.h>
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
|
|
int
|
|
__nss_readline (FILE *fp, char *buf, size_t len, off64_t *poffset)
|
|
{
|
|
/* We need space for at least one character, the line terminator,
|
|
and the NUL byte. */
|
|
if (len < 3)
|
|
{
|
|
*poffset = -1;
|
|
__set_errno (ERANGE);
|
|
return ERANGE;
|
|
}
|
|
|
|
while (true)
|
|
{
|
|
/* Keep original offset for retries. */
|
|
*poffset = __ftello64 (fp);
|
|
|
|
buf[len - 1] = '\xff'; /* Marker to recognize truncation. */
|
|
if (__fgets_unlocked (buf, len, fp) == NULL)
|
|
{
|
|
if (__feof_unlocked (fp))
|
|
{
|
|
__set_errno (ENOENT);
|
|
return ENOENT;
|
|
}
|
|
else
|
|
{
|
|
/* Any other error. Do not return ERANGE in this case
|
|
because the caller would retry. */
|
|
if (errno == ERANGE)
|
|
__set_errno (EINVAL);
|
|
return errno;
|
|
}
|
|
}
|
|
else if (buf[len - 1] != '\xff')
|
|
/* The buffer is too small. Arrange for re-reading the same
|
|
line on the next call. */
|
|
return __nss_readline_seek (fp, *poffset);
|
|
|
|
/* __fgets_unlocked succeeded. */
|
|
|
|
/* Remove leading whitespace. */
|
|
char *p = buf;
|
|
while (isspace (*p))
|
|
++p;
|
|
if (*p == '\0' || *p == '#')
|
|
/* Skip empty lines and comments. */
|
|
continue;
|
|
if (p != buf)
|
|
memmove (buf, p, strlen (p));
|
|
|
|
/* Return line to the caller. */
|
|
return 0;
|
|
}
|
|
}
|
|
libc_hidden_def (__nss_readline)
|
|
|
|
int
|
|
__nss_readline_seek (FILE *fp, off64_t offset)
|
|
{
|
|
if (offset < 0 /* __ftello64 failed. */
|
|
|| __fseeko64 (fp, offset, SEEK_SET) < 0)
|
|
{
|
|
/* Without seeking support, it is not possible to
|
|
re-read the same line, so this is a hard failure. */
|
|
fseterr_unlocked (fp);
|
|
__set_errno (ESPIPE);
|
|
return ESPIPE;
|
|
}
|
|
else
|
|
{
|
|
__set_errno (ERANGE);
|
|
return ERANGE;
|
|
}
|
|
}
|