Reworked the password stuff to be reentrant. Group stuff is

still needing to be reworked.
 -Erik

include/pwd.h

@@ -22,18 +22,38 @@ extern void setpwent __P ((void));
 extern void endpwent __P ((void));
 extern struct passwd * getpwent __P ((void));
 
-extern int putpwent __P ((__const struct passwd * __p, FILE * __f));
+extern int putpwent __P ((const struct passwd * __p, FILE * __f));
 extern int getpw __P ((uid_t uid, char *buf));
 
 extern struct passwd * fgetpwent __P ((FILE * file));
 
-extern struct passwd * getpwuid __P ((__const uid_t));
-extern struct passwd * getpwnam __P ((__const char *));
+extern struct passwd * getpwuid __P ((const uid_t));
+extern struct passwd * getpwnam __P ((const char *));
+
+
+extern int getpwent_r __P ((struct passwd *__restrict __resultbuf,
+			    char *__restrict __buffer, size_t __buflen,
+			    struct passwd **__restrict __result));
+extern int getpwuid_r __P ((uid_t __uid,
+			    struct passwd *__restrict __resultbuf,
+			    char *__restrict __buffer, size_t __buflen,
+			    struct passwd **__restrict __result));
+extern int getpwnam_r __P ((const char *__restrict __name,
+			    struct passwd *__restrict __resultbuf,
+			    char *__restrict __buffer, size_t __buflen,
+			    struct passwd **__restrict __result));
+extern int fgetpwent_r __P ((FILE *__restrict __stream,
+			     struct passwd *__restrict __resultbuf,
+			     char *__restrict __buffer, size_t __buflen,
+			     struct passwd **__restrict __result));
 
 #ifdef __LIBC__
-extern struct passwd * __getpwent __P ((__const int passwd_fd));
+/* This is used internally to uClibc */
+extern int __getpwent_r(struct passwd * passwd, char * line_buff, 
+	size_t buflen, int pwd_fd);
 #endif
 
+
 #endif /* pwd.h  */
 
 

libc/pwd_grp/Makefile

@@ -24,8 +24,9 @@ TOPDIR=../
 include $(TOPDIR)Rules.mak
 LIBC=$(TOPDIR)libc.a
 
-CSRC=__getpwent.c pwent.c getpwnam.c getpwuid.c putpwent.c getpw.c fgetpwent.c \
-	__getgrent.c grent.c getgrnam.c getgrgid.c fgetgrent.c initgroups.c
+CSRC= pwent.c getpwnam.c getpwuid.c putpwent.c getpw.c fgetpwent.c \
+	__getgrent.c grent.c getgrnam.c getgrgid.c fgetgrent.c \
+	initgroups.c __getpwent_r.c
 COBJS=$(patsubst %.c,%.o, $(CSRC))
 OBJS=$(COBJS)
 

libc/pwd_grp/__getpwent_r.c

@@ -0,0 +1,112 @@
+/*
+ * __getpwent_r.c - This file is part of the libc-8086/pwd package for ELKS,
+ * Copyright (C) 1995, 1996 Nat Friedman <ndf@linux.mit.edu>.
+ * Copyright (C) 2001 Erik Andersen <andersee@debian.org>
+ * 
+ *  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.
+ *
+ * March 7, 2001 -- Reworked to be reentrant by Erik Andersen 
+ */
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <fcntl.h>
+#include <pwd.h>
+
+
+/* This isn't as flash as my previous version -- it doesn't dynamically
+  scale down the gecos on too-long lines, but it also makes fewer syscalls,
+  so it's probably nicer.  Write me if you want the old version.  Maybe I
+  should include it as a build-time option... ?
+  -Nat <ndf@linux.mit.edu> */
+	
+int __getpwent_r(struct passwd * passwd, char * line_buff, size_t buflen, int pwd_fd)
+{
+	char *field_begin;
+	char *endptr;
+	char *gid_ptr=NULL;
+	char *uid_ptr=NULL;
+	int line_len;
+	int i;
+
+	/* We use the restart label to handle malformatted lines */
+  restart:
+	/* Read the passwd line into the static buffer using a minimal of
+	   syscalls. */
+	if ((line_len = read(pwd_fd, line_buff, buflen)) <= 0)
+		return -1;
+	field_begin = strchr(line_buff, '\n');
+	if (field_begin != NULL)
+		lseek(pwd_fd, (long) (1 + field_begin - (line_buff + line_len)),
+			  SEEK_CUR);
+	else {						/* The line is too long - skip it. :-\ */
+
+		do {
+			if ((line_len = read(pwd_fd, line_buff, buflen)) <= 0)
+				return -1;
+		} while (!(field_begin = strchr(line_buff, '\n')));
+		lseek(pwd_fd, (long) (field_begin - line_buff) - line_len + 1,
+			  SEEK_CUR);
+		goto restart;
+	}
+	if (*line_buff == '#' || *line_buff == ' ' || *line_buff == '\n' ||
+		*line_buff == '\t')
+		goto restart;
+	*field_begin = '\0';
+
+	/* We've read the line; now parse it. */
+	field_begin = line_buff;
+	for (i = 0; i < 7; i++) {
+		switch (i) {
+		case 0:
+			passwd->pw_name = field_begin;
+			break;
+		case 1:
+			passwd->pw_passwd = field_begin;
+			break;
+		case 2:
+			uid_ptr = field_begin;
+			break;
+		case 3:
+			gid_ptr = field_begin;
+			break;
+		case 4:
+			passwd->pw_gecos = field_begin;
+			break;
+		case 5:
+			passwd->pw_dir = field_begin;
+			break;
+		case 6:
+			passwd->pw_shell = field_begin;
+			break;
+		}
+		if (i < 6) {
+			field_begin = strchr(field_begin, ':');
+			if (field_begin == NULL)
+				goto restart;
+			*field_begin++ = '\0';
+		}
+	}
+	passwd->pw_gid = (gid_t) strtoul(gid_ptr, &endptr, 10);
+	if (*endptr != '\0')
+		goto restart;
+
+	passwd->pw_uid = (uid_t) strtoul(uid_ptr, &endptr, 10);
+	if (*endptr != '\0')
+		goto restart;
+
+	return 0;
+}

libc/pwd_grp/fgetpwent.c

@@ -22,12 +22,26 @@
 #include <stdio.h>
 #include <pwd.h>
 
-struct passwd *fgetpwent(FILE * file)
+#define PWD_BUFFER_SIZE 256
+
+/* file descriptor for the password file currently open */
+static char line_buff[PWD_BUFFER_SIZE];
+static struct passwd pwd;
+
+int fgetpwent_r (FILE *file, struct passwd *password,
+	char *buff, size_t buflen, struct passwd **crap)
 {
 	if (file == NULL) {
 		errno = EINTR;
-		return NULL;
+		return -1;
 	}
+	return(__getpwent_r(password, buff, buflen, fileno(file)));
+}
 
-	return __getpwent(fileno(file));
+struct passwd *fgetpwent(FILE * file)
+{
+    if (fgetpwent_r(file, &pwd, line_buff, PWD_BUFFER_SIZE, NULL) != -1) {
+	return &pwd;
+    }
+    return NULL;
 }

libc/pwd_grp/getpwnam.c

@@ -25,25 +25,41 @@
 #include <pwd.h>
 
 
-struct passwd *getpwnam(const char *name)
+#define PWD_BUFFER_SIZE 256
+
+/* file descriptor for the password file currently open */
+static char line_buff[PWD_BUFFER_SIZE];
+static struct passwd pwd;
+
+
+int getpwnam_r (const char *name, struct passwd *password,
+	char *buff, size_t buflen, struct passwd **crap)
 {
 	int passwd_fd;
-	struct passwd *passwd;
 
 	if (name == NULL) {
 		errno = EINVAL;
-		return NULL;
+		return -1;
 	}
 
 	if ((passwd_fd = open("/etc/passwd", O_RDONLY)) < 0)
-		return NULL;
+		return -1;
 
-	while ((passwd = __getpwent(passwd_fd)) != NULL)
-		if (!strcmp(passwd->pw_name, name)) {
+	while (__getpwent_r(password, buff, buflen, passwd_fd) != -1)
+		if (!strcmp(password->pw_name, name)) {
 			close(passwd_fd);
-			return passwd;
+			return 0;
 		}
 
 	close(passwd_fd);
-	return NULL;
+	return -1;
 }
+
+struct passwd *getpwnam(const char *name)
+{
+    if (getpwnam_r(name, &pwd, line_buff, PWD_BUFFER_SIZE, NULL) != -1) {
+	return &pwd;
+    }
+    return NULL;
+}
+

libc/pwd_grp/getpwuid.c

@@ -23,20 +23,36 @@
 #include <fcntl.h>
 #include <pwd.h>
 
-struct passwd *getpwuid(uid_t uid)
+
+#define PWD_BUFFER_SIZE 256
+
+/* file descriptor for the password file currently open */
+static char line_buff[PWD_BUFFER_SIZE];
+static struct passwd pwd;
+
+int getpwuid_r (uid_t uid, struct passwd *password,
+	char *buff, size_t buflen, struct passwd **crap)
 {
 	int passwd_fd;
-	struct passwd *passwd;
 
 	if ((passwd_fd = open("/etc/passwd", O_RDONLY)) < 0)
-		return NULL;
+		return -1;
 
-	while ((passwd = __getpwent(passwd_fd)) != NULL)
-		if (passwd->pw_uid == uid) {
+	while (__getpwent_r(password, buff, buflen, passwd_fd) != -1)
+		if (password->pw_uid == uid) {
 			close(passwd_fd);
-			return passwd;
+			return 0;
 		}
 
 	close(passwd_fd);
-	return NULL;
+	return -1;
 }
+
+struct passwd *getpwuid(uid_t uid)
+{
+    if (getpwuid_r(uid, &pwd, line_buff, PWD_BUFFER_SIZE, NULL) != -1) {
+	return &pwd;
+    }
+    return NULL;
+}
+

libc/pwd_grp/pwent.c

@@ -30,8 +30,12 @@
  * link them all in together.
  */
 
+#define PWD_BUFFER_SIZE 256
+
 /* file descriptor for the password file currently open */
 static int pw_fd = -1;
+static char line_buff[PWD_BUFFER_SIZE];
+static struct passwd pwd;
 
 void setpwent(void)
 {
@@ -48,9 +52,20 @@ void endpwent(void)
 	pw_fd = -1;
 }
 
+int getpwent_r (struct passwd *password, char *buff, 
+	size_t buflen, struct passwd **crap)
+{
+    if (pw_fd != -1 && __getpwent_r(password, buff, buflen, pw_fd) != -1) {
+	return 0;
+    }
+    return -1;
+}
+
 struct passwd *getpwent(void)
 {
-	if (pw_fd != -1)
-		return (__getpwent(pw_fd));
-	return NULL;
+    if (getpwent_r(&pwd, line_buff, PWD_BUFFER_SIZE, NULL) != -1) {
+	return &pwd;
+    }
+    return NULL;
 }
+