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authorFlorian Weimer <fweimer@redhat.com>2015-04-08 20:51:34 +0200
committerFlorian Weimer <fweimer@redhat.com>2015-04-08 21:07:03 +0200
commit866ba63b312fd015e1585ee46943f57187e82868 (patch)
treebe475646a9588c10c14b6b745b79912bd334a9d7 /grp
parentpldd: Use struct scratch_buffer instead of extend_alloca (diff)
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grp: Rewrite to use struct scratch_buffer instead of extend_alloca
grp/compat-initgroups.c is included from nscd/initgrcache.c, which is why the #include directive has to be added there as well.
Diffstat (limited to 'grp')
-rw-r--r--grp/compat-initgroups.c26
-rw-r--r--grp/initgroups.c2
2 files changed, 9 insertions, 19 deletions
diff --git a/grp/compat-initgroups.c b/grp/compat-initgroups.c
index ff10e247f4..3dd50d2306 100644
--- a/grp/compat-initgroups.c
+++ b/grp/compat-initgroups.c
@@ -14,7 +14,6 @@ compat_call (service_user *nip, const char *user, gid_t group, long int *start,
long int *size, gid_t **groupsp, long int limit, int *errnop)
{
struct group grpbuf;
- size_t buflen = __sysconf (_SC_GETGR_R_SIZE_MAX);
enum nss_status status;
set_function setgrent_fct;
get_function getgrent_fct;
@@ -35,30 +34,22 @@ compat_call (service_user *nip, const char *user, gid_t group, long int *start,
endgrent_fct = __nss_lookup_function (nip, "endgrent");
- char *tmpbuf = __alloca (buflen);
- bool use_malloc = false;
+ struct scratch_buffer tmpbuf;
+ scratch_buffer_init (&tmpbuf);
enum nss_status result = NSS_STATUS_SUCCESS;
do
{
while ((status = DL_CALL_FCT (getgrent_fct,
- (&grpbuf, tmpbuf, buflen, errnop)),
+ (&grpbuf, tmpbuf.data, tmpbuf.length,
+ errnop)),
status == NSS_STATUS_TRYAGAIN)
&& *errnop == ERANGE)
{
- if (__libc_use_alloca (buflen * 2))
- tmpbuf = extend_alloca (tmpbuf, buflen, buflen * 2);
- else
+ if (!scratch_buffer_grow (&tmpbuf))
{
- buflen *= 2;
- char *newbuf = realloc (use_malloc ? tmpbuf : NULL, buflen);
- if (newbuf == NULL)
- {
- result = NSS_STATUS_TRYAGAIN;
- goto done;
- }
- use_malloc = true;
- tmpbuf = newbuf;
+ result = NSS_STATUS_TRYAGAIN;
+ goto done;
}
}
@@ -116,8 +107,7 @@ compat_call (service_user *nip, const char *user, gid_t group, long int *start,
while (status == NSS_STATUS_SUCCESS);
done:
- if (use_malloc)
- free (tmpbuf);
+ scratch_buffer_free (&tmpbuf);
if (endgrent_fct)
DL_CALL_FCT (endgrent_fct, ());
diff --git a/grp/initgroups.c b/grp/initgroups.c
index 4d083acee5..14a8ab158d 100644
--- a/grp/initgroups.c
+++ b/grp/initgroups.c
@@ -15,7 +15,6 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
-#include <alloca.h>
#include <assert.h>
#include <errno.h>
#include <grp.h>
@@ -26,6 +25,7 @@
#include <sys/param.h>
#include <sys/types.h>
#include <nsswitch.h>
+#include <scratch_buffer.h>
#include "../nscd/nscd-client.h"
#include "../nscd/nscd_proto.h"