Rewrite the pwd.h, grp.h, and shadow.h functions (except lckpwdf/ulckpwdf).

1 files changed, 1172 insertions, 0 deletions

diff --git a/libc/pwd_grp/pwd_grp.c b/libc/pwd_grp/pwd_grp.c
new file mode 100644
index 000000000..da8893eb9
--- /dev/null
+++ b/libc/pwd_grp/pwd_grp.c
@@ -0,0 +1,1172 @@
+/*  Copyright (C) 2003     Manuel Novoa III
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This 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
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public
+ *  License along with this library; if not, write to the Free
+ *  Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/*  Nov 6, 2003  Initial version.
+ *
+ *  NOTE: This implementation is quite strict about requiring all
+ *    field seperators.  It also does not allow leading whitespace
+ *    except when processing the numeric fields.  glibc is more
+ *    lenient.  See the various glibc difference comments below.
+ *
+ *  TODO:
+ *    Move to dynamic allocation of (currently staticly allocated)
+ *      buffers; especially for the group-related functions since
+ *      large group member lists will cause error returns.
+ *
+ */
+
+#define _GNU_SOURCE
+#include <features.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <stddef.h>
+#include <errno.h>
+#include <assert.h>
+#include <ctype.h>
+#include <pwd.h>
+#include <grp.h>
+#include <shadow.h>
+#ifdef __UCLIBC_HAS_THREADS__
+#include <pthread.h>
+#endif
+
+/**********************************************************************/
+/* Sizes for staticly allocated buffers. */
+
+#define PWD_BUFFER_SIZE 256
+#define GRP_BUFFER_SIZE 256
+
+/**********************************************************************/
+/* Prototypes for internal functions. */
+
+extern int __parsepwent(void *pw, char *line);
+extern int __parsegrent(void *gr, char *line);
+extern int __parsespent(void *sp, char *line);
+
+extern int __pgsreader(int (*__parserfunc)(void *d, char *line), void *data,
+					   char *__restrict line_buff, size_t buflen, FILE *f);
+
+/**********************************************************************/
+/* For the various fget??ent_r funcs, return
+ *
+ *  0: success
+ *  ENOENT: end-of-file encountered
+ *  ERANGE: buflen too small
+ *  other error values possible. See __pgsreader.
+ *
+ * Also, *result == resultbuf on success and NULL on failure.
+ *
+ * NOTE: glibc difference - For the ENOENT case, glibc also sets errno.
+ *   We do not, as it really isn't an error if we reach the end-of-file.
+ *   Doing so is analogous to having fgetc() set errno on EOF.
+ */
+/**********************************************************************/
+#ifdef L_fgetpwent_r
+
+int fgetpwent_r(FILE *__restrict stream, struct passwd *__restrict resultbuf,
+				char *__restrict buffer, size_t buflen,
+				struct passwd **__restrict result)
+{
+	int rv;
+
+	*result = NULL;
+
+	if (!(rv = __pgsreader(__parsepwent, resultbuf, buffer, buflen, stream))) {
+		*result = resultbuf;
+	}
+
+	return rv;
+}
+
+#endif
+/**********************************************************************/
+#ifdef L_fgetgrent_r
+
+int fgetgrent_r(FILE *__restrict stream, struct group *__restrict resultbuf,
+				char *__restrict buffer, size_t buflen,
+				struct group **__restrict result)
+{
+	int rv;
+
+	*result = NULL;
+
+	if (!(rv = __pgsreader(__parsegrent, resultbuf, buffer, buflen, stream))) {
+		*result = resultbuf;
+	}
+
+	return rv;
+}
+
+#endif
+/**********************************************************************/
+#ifdef L_fgetspent_r
+
+int fgetspent_r(FILE *__restrict stream, struct spwd *__restrict resultbuf,
+				char *__restrict buffer, size_t buflen,
+				struct spwd **__restrict result)
+{
+	int rv;
+
+	*result = NULL;
+
+	if (!(rv = __pgsreader(__parsespent, resultbuf, buffer, buflen, stream))) {
+		*result = resultbuf;
+	}
+
+	return rv;
+}
+
+#endif
+/**********************************************************************/
+/* For the various fget??ent funcs, return NULL on failure and a
+ * pointer to the appropriate struct (staticly allocated) on success.
+ */
+/**********************************************************************/
+#ifdef L_fgetpwent
+
+struct passwd *fgetpwent(FILE *stream)
+{
+	static char buffer[PWD_BUFFER_SIZE];
+	static struct passwd resultbuf;
+	struct passwd *result;
+
+	fgetpwent_r(stream, &resultbuf, buffer, sizeof(buffer), &result);
+	return result;
+}
+
+#endif
+/**********************************************************************/
+#ifdef L_fgetgrent
+
+struct group *fgetgrent(FILE *stream)
+{
+	static char buffer[GRP_BUFFER_SIZE];
+	static struct group resultbuf;
+	struct group *result;
+
+	fgetgrent_r(stream, &resultbuf, buffer, sizeof(buffer), &result);
+	return result;
+}
+
+#endif
+/**********************************************************************/
+#ifdef L_fgetspent
+
+struct spwd *fgetspent(FILE *stream)
+{
+	static char buffer[PWD_BUFFER_SIZE];
+	static struct spwd resultbuf;
+	struct spwd *result;
+
+	fgetspent_r(stream, &resultbuf, buffer, sizeof(buffer), &result);
+	return result;
+}
+
+#endif
+/**********************************************************************/
+#ifdef L_sgetspent_r
+
+int sgetspent_r(const char *string, struct spwd *result_buf,
+				char *buffer, size_t buflen, struct spwd **result)
+{
+	int rv = ERANGE;
+
+	*result = NULL;
+
+	if (buflen < PWD_BUFFER_SIZE) {
+	DO_ERANGE:
+		__set_errno(rv);
+		goto DONE;
+	}
+
+	if (string != buffer) {
+		if (strlen(string) >= buflen) {
+			goto DO_ERANGE;
+		}
+		strcpy(buffer, string);
+	}
+
+	if (!(rv = __parsespent(result_buf, buffer))) {
+		*result = result_buf;
+	}
+
+ DONE:
+	return rv;
+}
+
+#endif
+/**********************************************************************/
+
+#ifdef GETXXKEY_R_FUNC
+#error GETXXKEY_R_FUNC is already defined!
+#endif
+
+#ifdef L_getpwnam_r
+#define GETXXKEY_R_FUNC			getpwnam_r
+#define GETXXKEY_R_PARSER   	__parsepwent
+#define GETXXKEY_R_ENTTYPE		struct passwd
+#define GETXXKEY_R_TEST(ENT)	(!strcmp((ENT)->pw_name, key))
+#define DO_GETXXKEY_R_KEYTYPE	const char *__restrict
+#define DO_GETXXKEY_R_PATHNAME  _PATH_PASSWD
+#endif
+
+#ifdef L_getgrnam_r
+#define GETXXKEY_R_FUNC			getgrnam_r
+#define GETXXKEY_R_PARSER   	__parsegrent
+#define GETXXKEY_R_ENTTYPE		struct group
+#define GETXXKEY_R_TEST(ENT)	(!strcmp((ENT)->gr_name, key))
+#define DO_GETXXKEY_R_KEYTYPE	const char *__restrict
+#define DO_GETXXKEY_R_PATHNAME  _PATH_GROUP
+#endif
+
+#ifdef L_getspnam_r
+#define GETXXKEY_R_FUNC			getspnam_r
+#define GETXXKEY_R_PARSER   	__parsespent
+#define GETXXKEY_R_ENTTYPE		struct spwd
+#define GETXXKEY_R_TEST(ENT)	(!strcmp((ENT)->sp_namp, key))
+#define DO_GETXXKEY_R_KEYTYPE	const char *__restrict
+#define DO_GETXXKEY_R_PATHNAME  _PATH_SHADOW
+#endif
+
+#ifdef L_getpwuid_r
+#define GETXXKEY_R_FUNC			getpwuid_r
+#define GETXXKEY_R_PARSER   	__parsepwent
+#define GETXXKEY_R_ENTTYPE		struct passwd
+#define GETXXKEY_R_TEST(ENT)	((ENT)->pw_uid == key)
+#define DO_GETXXKEY_R_KEYTYPE	uid_t
+#define DO_GETXXKEY_R_PATHNAME  _PATH_PASSWD
+#endif
+
+#ifdef L_getgrgid_r
+#define GETXXKEY_R_FUNC			getgrgid_r
+#define GETXXKEY_R_PARSER   	__parsegrent
+#define GETXXKEY_R_ENTTYPE		struct group
+#define GETXXKEY_R_TEST(ENT)	((ENT)->gr_gid == key)
+#define DO_GETXXKEY_R_KEYTYPE	gid_t
+#define DO_GETXXKEY_R_PATHNAME  _PATH_GROUP
+#endif
+
+/**********************************************************************/
+#ifdef GETXXKEY_R_FUNC
+
+int GETXXKEY_R_FUNC(DO_GETXXKEY_R_KEYTYPE key,
+					GETXXKEY_R_ENTTYPE *__restrict resultbuf,
+					char *__restrict buffer, size_t buflen,
+					GETXXKEY_R_ENTTYPE **__restrict result)
+{
+	FILE *stream;
+	int rv;
+
+	*result = NULL;
+
+	if (!(stream = fopen(DO_GETXXKEY_R_PATHNAME, "r"))) {
+		rv = errno;
+	} else {
+		__STDIO_SET_USER_LOCKING(stream);
+		do {
+			if (!(rv = __pgsreader(GETXXKEY_R_PARSER, resultbuf,
+								   buffer, buflen, stream))
+				) {
+				if (GETXXKEY_R_TEST(resultbuf)) { /* Found key? */
+					*result = resultbuf;
+					break;
+				}
+			} else {
+				if (rv == ENOENT) {	/* end-of-file encountered. */
+					rv = 0;
+				}
+				break;
+			}
+		} while (1);
+		fclose(stream);
+	}
+
+	return rv;
+}
+
+#endif
+/**********************************************************************/
+#ifdef L_getpwuid
+
+struct passwd *getpwuid(uid_t uid)
+{
+	static char buffer[PWD_BUFFER_SIZE];
+	static struct passwd resultbuf;
+	struct passwd *result;
+
+	getpwuid_r(uid, &resultbuf, buffer, sizeof(buffer), &result);
+	return result;
+}
+
+#endif
+/**********************************************************************/
+#ifdef L_getgrgid
+
+struct group *getgrgid(gid_t gid)
+{
+	static char buffer[GRP_BUFFER_SIZE];
+	static struct group resultbuf;
+	struct group *result;
+
+	getgrgid_r(gid, &resultbuf, buffer, sizeof(buffer), &result);
+	return result;
+}
+
+#endif
+/**********************************************************************/
+#ifdef L_getspuid_r
+
+/* This function is non-standard and is currently not built.  It seems
+ * to have been created as a reentrant version of the non-standard
+ * functions getspuid.  Why getspuid was added, I do not know. */
+
+int getspuid_r(uid_t uid, struct spwd *__restrict resultbuf,
+		       char *__restrict buffer, size_t buflen,
+		       struct spwd **__restrict result)
+{
+	int rv;
+	struct passwd *pp;
+	struct passwd password;
+	char pwd_buff[PWD_BUFFER_SIZE];
+
+	*result = NULL;
+	if (!(rv = getpwuid_r(uid, &password, pwd_buff, sizeof(pwd_buff), &pp))) {
+		rv = getspnam_r(password.pw_name, resultbuf, buffer, buflen, result);
+	}
+
+	return rv;
+}
+
+#endif
+/**********************************************************************/
+#ifdef L_getspuid
+
+/* This function is non-standard and is currently not built.
+ * Why it was added, I do not know. */
+
+struct spwd *getspuid(uid_t uid)
+{
+	static char buffer[PWD_BUFFER_SIZE];
+	static struct spwd resultbuf;
+	struct spwd *result;
+
+	getspuid_r(uid, &resultbuf, buffer, sizeof(buffer), &result);
+	return result;
+}
+
+#endif
+/**********************************************************************/
+#ifdef L_getpwnam
+
+struct passwd *getpwnam(const char *name)
+{
+	static char buffer[PWD_BUFFER_SIZE];
+	static struct passwd resultbuf;
+	struct passwd *result;
+
+	getpwnam_r(name, &resultbuf, buffer, sizeof(buffer), &result);
+	return result;
+}
+
+#endif
+/**********************************************************************/
+#ifdef L_getgrnam
+
+struct group *getgrnam(const char *name)
+{
+	static char buffer[GRP_BUFFER_SIZE];
+	static struct group resultbuf;
+	struct group *result;
+
+	getgrnam_r(name, &resultbuf, buffer, sizeof(buffer), &result);
+	return result;
+}
+
+#endif
+/**********************************************************************/
+#ifdef L_getspnam
+
+struct spwd *getspnam(const char *name)
+{
+	static char buffer[PWD_BUFFER_SIZE];
+	static struct spwd resultbuf;
+	struct spwd *result;
+
+	getspnam_r(name, &resultbuf, buffer, sizeof(buffer), &result);
+	return result;
+}
+
+#endif
+/**********************************************************************/
+#ifdef L_getpw
+
+int getpw(uid_t uid, char *buf)
+{
+	struct passwd resultbuf;
+	struct passwd *result;
+	char buffer[PWD_BUFFER_SIZE];
+
+	if (!buf) {
+		__set_errno(EINVAL);
+	} else if (!getpwuid_r(uid, &resultbuf, buffer, sizeof(buffer), &result)) {
+		if (sprintf(buf, "%s:%s:%lu:%lu:%s:%s:%s\n",
+					resultbuf.pw_name, resultbuf.pw_passwd,
+					(unsigned long)(resultbuf.pw_uid),
+					(unsigned long)(resultbuf.pw_gid),
+					resultbuf.pw_gecos, resultbuf.pw_dir,
+					resultbuf.pw_shell) >= 0
+			) {
+			return 0;
+		}
+	}
+
+	return -1;
+}
+
+#endif
+/**********************************************************************/
+#ifdef L_getpwent_r
+
+#ifdef __UCLIBC_HAS_THREADS__
+static pthread_mutex_t mylock = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
+# define LOCK		pthread_mutex_lock(&mylock)
+# define UNLOCK		pthread_mutex_unlock(&mylock);
+#else       
+# define LOCK		((void) 0)
+# define UNLOCK		((void) 0)
+#endif      
+
+static FILE *pwf /*= NULL*/;
+
+void setpwent(void)
+{
+	LOCK;
+	if (pwf) {
+		rewind(pwf);
+	}
+	UNLOCK;
+}
+
+void endpwent(void)
+{
+	LOCK;
+	if (pwf) {
+		fclose(pwf);
+		pwf = NULL;
+	}
+	UNLOCK;
+}
+
+
+int getpwent_r(struct passwd *__restrict resultbuf, 
+			   char *__restrict buffer, size_t buflen,
+			   struct passwd **__restrict result)
+{
+	int rv;
+
+	LOCK;
+
+	*result = NULL;				/* In case of error... */
+
+	if (!pwf) {
+		if (!(pwf = fopen(_PATH_PASSWD, "r"))) {
+			rv = errno;
+			goto ERR;
+		}
+		__STDIO_SET_USER_LOCKING(pwf);
+	}
+
+	if (!(rv = __pgsreader(__parsepwent, resultbuf,
+						   buffer, buflen, pwf))) {
+		*result = resultbuf;
+	}
+
+ ERR:
+	UNLOCK;
+
+	return rv;
+}
+
+#endif
+/**********************************************************************/
+#ifdef L_getgrent_r
+
+#ifdef __UCLIBC_HAS_THREADS__
+static pthread_mutex_t mylock = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
+# define LOCK		pthread_mutex_lock(&mylock)
+# define UNLOCK		pthread_mutex_unlock(&mylock);
+#else       
+# define LOCK		((void) 0)
+# define UNLOCK		((void) 0)
+#endif      
+
+static FILE *grf /*= NULL*/;
+
+void setgrent(void)
+{
+	LOCK;
+	if (grf) {
+		rewind(grf);
+	}
+	UNLOCK;
+}
+
+void endgrent(void)
+{
+	LOCK;
+	if (grf) {
+		fclose(grf);
+		grf = NULL;
+	}
+	UNLOCK;
+}
+
+int getgrent_r(struct group *__restrict resultbuf,
+			   char *__restrict buffer, size_t buflen,
+			   struct group **__restrict result)
+{
+	int rv;
+
+	LOCK;
+
+	*result = NULL;				/* In case of error... */
+
+	if (!grf) {
+		if (!(grf = fopen(_PATH_GROUP, "r"))) {
+			rv = errno;
+			goto ERR;
+		}
+		__STDIO_SET_USER_LOCKING(grf);
+	}
+
+	if (!(rv = __pgsreader(__parsegrent, resultbuf,
+						   buffer, buflen, grf))) {
+		*result = resultbuf;
+	}
+
+ ERR:
+	UNLOCK;
+
+	return rv;
+}
+
+#endif
+/**********************************************************************/
+#ifdef L_getspent_r
+
+#ifdef __UCLIBC_HAS_THREADS__
+static pthread_mutex_t mylock = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
+# define LOCK		pthread_mutex_lock(&mylock)
+# define UNLOCK		pthread_mutex_unlock(&mylock);
+#else       
+# define LOCK		((void) 0)
+# define UNLOCK		((void) 0)
+#endif      
+
+static FILE *spf /*= NULL*/;
+
+void setspent(void)
+{
+	LOCK;
+	if (spf) {
+		rewind(spf);
+	}
+	UNLOCK;
+}
+
+void endspent(void)
+{
+	LOCK;
+	if (spf) {
+		fclose(spf);
+		spf = NULL;
+	}
+	UNLOCK;
+}
+
+int getspent_r(struct spwd *resultbuf, char *buffer, 
+			   size_t buflen, struct spwd **result)
+{
+	int rv;
+
+	LOCK;
+
+	*result = NULL;				/* In case of error... */
+
+	if (!spf) {
+		if (!(spf = fopen(_PATH_SHADOW, "r"))) {
+			rv = errno;
+			goto ERR;
+		}
+		__STDIO_SET_USER_LOCKING(spf);
+	}
+
+	if (!(rv = __pgsreader(__parsespent, resultbuf,
+						   buffer, buflen, spf))) {
+		*result = resultbuf;
+	}
+
+ ERR:
+	UNLOCK;
+
+	return rv;
+}
+
+#endif
+/**********************************************************************/
+#ifdef L_getpwent
+
+struct passwd *getpwent(void)
+{
+	static char line_buff[PWD_BUFFER_SIZE];
+	static struct passwd pwd;
+	struct passwd *result;
+
+	getpwent_r(&pwd, line_buff, sizeof(line_buff), &result);
+	return result;
+}
+
+#endif
+/**********************************************************************/
+#ifdef L_getgrent
+
+struct group *getgrent(void)
+{
+	static char line_buff[GRP_BUFFER_SIZE];
+	static struct group gr;
+	struct group *result;
+
+	getgrent_r(&gr, line_buff, sizeof(line_buff), &result);
+	return result;
+}
+
+#endif
+/**********************************************************************/
+#ifdef L_getspent
+
+struct spwd *getspent(void)
+{
+	static char line_buff[PWD_BUFFER_SIZE];
+	static struct spwd spwd;
+	struct spwd *result;
+
+	getspent_r(&spwd, line_buff, sizeof(line_buff), &result);
+	return result;
+}
+
+#endif
+/**********************************************************************/
+#ifdef L_sgetspent
+
+struct spwd *sgetspent(const char *string)
+{
+	static char line_buff[PWD_BUFFER_SIZE];
+	static struct spwd spwd;
+	struct spwd *result;
+
+	sgetspent_r(string, &spwd, line_buff, sizeof(line_buff), &result);
+	return result;
+}
+
+#endif
+/**********************************************************************/
+#ifdef L_initgroups
+
+int initgroups(const char *user, gid_t gid)
+{
+	FILE *grf;
+	gid_t *group_list;
+	int num_groups, rv;
+	char **m;
+	struct group group;
+	char buff[PWD_BUFFER_SIZE];
+
+	rv = -1;
+
+	/* We alloc space for 8 gids at a time. */
+	if (((group_list = (gid_t *) malloc(8*sizeof(gid_t *))) != NULL)
+		&& ((grf = fopen(_PATH_GROUP, "r")) != NULL)
+		) {
+
+		__STDIO_SET_USER_LOCKING(grf);
+
+		*group_list = gid;
+		num_groups = 1;
+
+		while (!__pgsreader(__parsegrent, &group, buff, sizeof(buff), grf)) {
+			assert(group.gr_mem); /* Must have at least a NULL terminator. */
+			if (group.gr_gid != gid) {
+				for (m=group.gr_mem ; *m ; m++) {
+					if (!strcmp(*m, user)) {
+						if (!(num_groups & 7)) {
+							gid_t *tmp = (gid_t *)
+								realloc(group_list,
+										(num_groups+8) * sizeof(gid_t *));
+							if (!tmp) {
+								rv = -1;
+								goto DO_CLOSE;
+							}
+							group_list = tmp;
+						}
+						group_list[num_groups++] = group.gr_gid;
+						break;
+					}
+				}
+			}
+		}
+
+		rv = setgroups(num_groups, group_list);
+	DO_CLOSE:
+		fclose(grf);
+	}
+
+	/* group_list will be NULL if initial malloc failed, which may trigger
+	 * warnings from various malloc debuggers. */
+	free(group_list);
+	return rv;
+}
+
+#endif
+/**********************************************************************/
+#ifdef L_putpwent
+
+int putpwent(const struct passwd *__restrict p, FILE *__restrict f)
+{
+	int rv = -1;
+
+	if (!p || !f) {
+		__set_errno(EINVAL);
+	} else {
+		/* No extra thread locking is needed above what fprintf does. */
+		if (fprintf(f, "%s:%s:%lu:%lu:%s:%s:%s\n",
+					p->pw_name, p->pw_passwd,
+					(unsigned long)(p->pw_uid),
+					(unsigned long)(p->pw_gid),
+					p->pw_gecos, p->pw_dir, p->pw_shell) >= 0
+			) {
+			rv = 0;
+		}
+	}
+
+	return rv;
+}
+
+#endif
+/**********************************************************************/
+#ifdef L_putgrent
+
+int putgrent(const struct group *__restrict p, FILE *__restrict f)
+{
+	static const char format[] = ",%s";
+	char **m;
+	const char *fmt;
+	int rv = -1;
+
+	if (!p || !f) {				/* Sigh... glibc checks. */
+		__set_errno(EINVAL);
+	} else {
+		__STDIO_THREADLOCK(f);
+
+		if (fprintf(f, "%s:%s:%lu:",
+					p->gr_name, p->gr_passwd,
+					(unsigned long)(p->gr_gid)) >= 0
+			) {
+
+			fmt = format + 1;
+
+			assert(p->gr_mem);
+			m = p->gr_mem;
+
+			do {
+				if (!*m) {
+					if (fputc_unlocked('\n', f) >= 0) {
+						rv = 0;
+					}
+					break;
+				}
+				if (fprintf(f, fmt, *m) < 0) {
+					break;
+				}
+				fmt = format;
+			} while (1);
+
+		}
+
+		__STDIO_THREADUNLOCK(f);
+	}
+
+	return rv;
+}
+
+#endif
+/**********************************************************************/
+#ifdef L_putspent
+
+static const unsigned char sp_off[] = {
+	offsetof(struct spwd, sp_lstchg),	/* 2 - not a char ptr */
+	offsetof(struct spwd, sp_min), 		/* 3 - not a char ptr */
+	offsetof(struct spwd, sp_max),		/* 4 - not a char ptr */
+	offsetof(struct spwd, sp_warn), 	/* 5 - not a char ptr */
+	offsetof(struct spwd, sp_inact), 	/* 6 - not a char ptr */
+	offsetof(struct spwd, sp_expire), 	/* 7 - not a char ptr */
+};
+
+int putspent(const struct spwd *p, FILE *stream)
+{
+	static const char ld_format[] = "%ld:";
+	const char *f;
+	long int x;
+	int i;
+	int rv = -1;
+
+	/* Unlike putpwent and putgrent, glibc does not check the args. */
+
+	__STDIO_THREADLOCK(stream);
+
+	if (fprintf(stream, "%s:%s:", p->sp_namp,
+				(p->sp_pwdp ? p->sp_pwdp : "")) < 0
+		) {
+		goto DO_UNLOCK;
+	}
+
+	for (i=0 ; i < sizeof(sp_off) ; i++) {
+		f = ld_format;
+		if ((x = *(const long int *)(((const char *) p) + sp_off[i])) == -1) {
+			f += 3;
+		}
+		if (fprintf(stream, f, x) < 0) {
+			goto DO_UNLOCK;
+		}
+	}
+
+	if ((p->sp_flag != ~0UL) && (fprintf(stream, "%lu", p->sp_flag) < 0)) {
+		goto DO_UNLOCK;
+	}
+
+	if (fputc_unlocked('\n', stream) > 0) {
+		rv = 0;
+	}
+
+ DO_UNLOCK:
+	__STDIO_THREADUNLOCK(stream);
+
+	return rv;
+}
+
+#endif
+/**********************************************************************/
+/* Internal uClibc functions.                                         */
+/**********************************************************************/
+#ifdef L___parsepwent
+
+static const unsigned char pw_off[] = {
+	offsetof(struct passwd, pw_name), 	/* 0 */
+	offsetof(struct passwd, pw_passwd),	/* 1 */
+	offsetof(struct passwd, pw_uid),	/* 2 - not a char ptr */
+	offsetof(struct passwd, pw_gid), 	/* 3 - not a char ptr */
+	offsetof(struct passwd, pw_gecos),	/* 4 */
+	offsetof(struct passwd, pw_dir), 	/* 5 */
+	offsetof(struct passwd, pw_shell) 	/* 6 */
+};
+
+int __parsepwent(void *data, char *line)
+{
+	char *endptr;
+	char *p;
+	int i;
+
+	i = 0;
+	do {
+		p = ((char *) ((struct passwd *) data)) + pw_off[i];
+
+		if ((i & 6) ^ 2) { 	/* i!=2 and i!=3 */
+			*((char **) p) = line;
+			if (i==6) {
+				return 0;
+			}
+			/* NOTE: glibc difference - glibc allows omission of
+			 * ':' seperators after the gid field if all remaining
+			 * entries are empty.  We require all separators. */
+			if (!(line = strchr(line, ':'))) {
+				break;
+			}
+		} else {
+			unsigned long t = strtoul(line, &endptr, 10);
+			/* Make sure we had at least one digit, and that the
+			 * failing char is the next field seperator ':'.  See
+			 * glibc difference note above. */
+			/* TODO: Also check for leading whitespace? */
+			if ((endptr == line) || (*endptr != ':')) {
+				break;
+			}
+			line = endptr;
+			if (i & 1) {		/* i == 3 -- gid */
+				*((gid_t *) p) = t;
+			} else {			/* i == 2 -- uid */
+				*((uid_t *) p) = t;
+			}
+		}
+
+		*line++ = 0;
+		++i;
+	} while (1);
+
+	return -1;
+}
+
+#endif
+/**********************************************************************/
+#ifdef L___parsegrent
+
+static const unsigned char gr_off[] = {
+	offsetof(struct group, gr_name), 	/* 0 */
+	offsetof(struct group, gr_passwd),	/* 1 */
+	offsetof(struct group, gr_gid)		/* 2 - not a char ptr */
+};
+
+int __parsegrent(void *data, char *line)
+{
+	char *endptr;
+	char *p;
+	int i;
+	char **members;
+	char *end_of_buf;
+
+	end_of_buf = ((struct group *) data)->gr_name; /* Evil hack! */
+	i = 0;
+	do {
+		p = ((char *) ((struct group *) data)) + gr_off[i];
+
+		if (i < 2) {
+			*((char **) p) = line;
+			if (!(line = strchr(line, ':'))) {
+				break;
+			}
+			*line++ = 0;
+			++i;
+		} else {
+			*((gid_t *) p) = strtoul(line, &endptr, 10);
+
+			/* NOTE: glibc difference - glibc allows omission of the
+			 * trailing colon when there is no member list.  We treat
+			 * this as an error. */
+			if (*endptr != ':') {
+				break;
+			}
+
+			i = 1;				/* Count terminating NULL ptr. */
+			p = endptr;
+
+			if (p[1]) { /* We have a member list to process. */
+				/* Overwrite the last ':' with a ',' before counting.
+				 * This allows us to test for initial ',' and adds
+				 * one ',' so that the ',' count equals the member
+				 * count. */
+				*p = ',';
+				do {
+					/* NOTE: glibc difference - glibc allows and trims leading
+					 * (but not trailing) space.  We treat this as an error. */
+					/* NOTE: glibc difference - glibc allows consecutive and
+					 * trailing commas, and ignores "empty string" users.  We
+					 * treat this as an error. */
+					if (*p == ',') {
+						++i;
+						*p = 0;	/* nul-terminate each member string. */
+						if (!*++p || (*p == ',') || isspace(*p)) {
+							goto ERR;
+						}
+					}
+				} while (*++p);
+			}
+
+			/* Now align (p+1), rounding up. */
+			/* Assumes sizeof(char **) is a power of 2. */
+			members = (char **)( (((intptr_t) p) + sizeof(char **))
+								 & ~((intptr_t)(sizeof(char **) - 1)) );
+
+			if (((char *)(members + i)) > end_of_buf) {	/* No space. */
+				break;
+			}
+
+			((struct group *) data)->gr_mem = members;
+
+			if (--i) {
+				p = endptr;	/* Pointing to char prior to first member. */
+				do {
+					*members++ = ++p;
+					if (!--i) break;
+					while (*++p) {}
+				} while (1);
+			}				
+			*members = NULL;
+
+			return 0;
+		}
+	} while (1);
+
+ ERR:
+	return -1;
+}
+
+#endif
+/**********************************************************************/
+#ifdef L___parsespent
+
+static const unsigned char sp_off[] = {
+	offsetof(struct spwd, sp_namp),		/* 0 */
+	offsetof(struct spwd, sp_pwdp),		/* 1 */
+	offsetof(struct spwd, sp_lstchg),	/* 2 - not a char ptr */
+	offsetof(struct spwd, sp_min), 		/* 3 - not a char ptr */
+	offsetof(struct spwd, sp_max),		/* 4 - not a char ptr */
+	offsetof(struct spwd, sp_warn), 	/* 5 - not a char ptr */
+	offsetof(struct spwd, sp_inact), 	/* 6 - not a char ptr */
+	offsetof(struct spwd, sp_expire), 	/* 7 - not a char ptr */
+	offsetof(struct spwd, sp_flag) 		/* 8 - not a char ptr */
+};
+
+int __parsespent(void *data, char * line)
+{
+	char *endptr;
+	char *p;
+	int i;
+
+	i = 0;
+	do {
+		p = ((char *) ((struct spwd *) data)) + sp_off[i];
+		if (i < 2) {
+			*((char **) p) = line;
+			if (!(line = strchr(line, ':'))) {
+				break;
+			}
+		} else {
+#if 0
+			if (i==5) {			/* Support for old format. */
+				while (isspace(*line)) ++line; /* glibc eats space here. */
+				if (!*line) {
+					((struct spwd *) data)->sp_warn = -1;
+					((struct spwd *) data)->sp_inact = -1;
+					((struct spwd *) data)->sp_expire = -1;
+					((struct spwd *) data)->sp_flag = ~0UL;
+					return 0;
+				}
+			}
+#endif
+
+			*((long *) p) = (long) strtoul(line, &endptr, 10);
+
+			if (endptr == line) {
+				*((long *) p) = ((i != 8) ? -1L : ((long)(~0UL)));
+			}
+
+			line = endptr;
+
+			if (i == 8) {
+				if (!*endptr) {
+					return 0;
+				}
+				break;
+			}
+
+			if (*endptr != ':') {
+				break;
+			}
+
+		}
+
+		*line++ = 0;
+		++i;
+	} while (1);
+
+	return EINVAL;
+}
+
+#endif
+/**********************************************************************/
+#ifdef L___pgsreader
+
+/* Reads until if EOF, or until if finds a line which fits in the buffer
+ * and for which the parser function succeeds.
+ *
+ * Returns 0 on success and ENOENT for end-of-file (glibc concession).
+ * On error, it both sets errno to ERANGE and returns ERANGE.
+ * (seems to be glibc behavior.)
+ */
+
+int __pgsreader(int (*__parserfunc)(void *d, char *line), void *data,
+				char *__restrict line_buff, size_t buflen, FILE *f)
+{
+	int line_len;
+	int skip;
+	int rv = ERANGE;
+
+	if (buflen < PWD_BUFFER_SIZE) {
+		__set_errno(rv);
+	} else {
+		__STDIO_THREADLOCK(f);
+
+		skip = 0;
+		do {
+			if (!fgets_unlocked(line_buff, buflen, f)) {
+				if (feof_unlocked(f)) {
+					rv = ENOENT;
+				}
+				break;
+			}
+
+			line_len = strlen(line_buff) - 1; /* strlen() must be > 0. */
+			if (line_buff[line_len] == '\n') {
+				line_buff[line_len] = 0;
+			} else if (line_len + 2 == buflen) { /* line too long */
+				++skip;
+				continue;
+			}
+
+			if (skip) {
+				--skip;
+				continue;
+			}
+
+			/* NOTE: glibc difference - glibc strips leading whitespace from
+			 * records.  We do not allow leading whitespace. */
+
+			/* Skip empty lines, comment lines, and lines with leading
+			 * whitespace. */
+			if (*line_buff && (*line_buff != '#') && !isspace(*line_buff)) {
+				if (__parserfunc == __parsegrent) {	/* Do evil group hack. */
+					/* The group entry parsing function needs to know where
+					 * the end of the buffer is so that it can construct the
+					 * group member ptr table. */
+					((struct group *) data)->gr_name = line_buff + buflen;
+				}
+
+				if (!__parserfunc(data, line_buff)) {
+					rv = 0;
+					break;
+				}
+			}
+		} while (1);
+
+		__STDIO_THREADUNLOCK(f);
+	}
+
+	return rv;
+}
+
+#endif
+/**********************************************************************/