[svn-upgrade] Integrating new upstream version, shadow (19990709)

lib/sgetpwent.c

@@ -0,0 +1,136 @@
+/*
+ * Copyright 1989 - 1994, Julianne Frances Haugh
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Julianne F. Haugh nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <config.h>
+
+#include "rcsid.h"
+RCSID("$Id: sgetpwent.c,v 1.5 1998/04/02 21:51:46 marekm Exp $")
+
+#include <sys/types.h>
+#include "defines.h"
+#include <stdio.h>
+#include <pwd.h>
+
+#define	NFIELDS	7
+
+/*
+ * sgetpwent - convert a string to a (struct passwd)
+ *
+ * sgetpwent() parses a string into the parts required for a password
+ * structure.  Strict checking is made for the UID and GID fields and
+ * presence of the correct number of colons.  Any failing tests result
+ * in a NULL pointer being returned.
+ *
+ * NOTE: This function uses hard-coded string scanning functions for
+ *	performance reasons.  I am going to come up with some conditional
+ *	compilation glarp to improve on this in the future.
+ */
+
+struct passwd *
+sgetpwent(const char *buf)
+{
+	static struct passwd pwent;
+	static char pwdbuf[1024];
+	register int	i;
+	register char	*cp;
+	char	*ep;
+	char *fields[NFIELDS];
+
+	/*
+	 * Copy the string to a static buffer so the pointers into
+	 * the password structure remain valid.
+	 */
+
+	if (strlen(buf) >= sizeof pwdbuf)
+		return 0;  /* fail if too long */
+	strcpy(pwdbuf, buf);
+
+	/*
+	 * Save a pointer to the start of each colon separated
+	 * field.  The fields are converted into NUL terminated strings.
+	 */
+
+	for (cp = pwdbuf, i = 0;i < NFIELDS && cp;i++) {
+		fields[i] = cp;
+		while (*cp && *cp != ':')
+			++cp;
+	
+		if (*cp)
+			*cp++ = '\0';
+		else
+			cp = 0;
+	}
+
+	/*
+	 * There must be exactly NFIELDS colon separated fields or
+	 * the entry is invalid.  Also, the UID and GID must be non-blank.
+	 */
+
+	if (i != NFIELDS || *fields[2] == '\0' || *fields[3] == '\0')
+		return 0;
+
+	/*
+	 * Each of the fields is converted the appropriate data type
+	 * and the result assigned to the password structure.  If the
+	 * UID or GID does not convert to an integer value, a NULL
+	 * pointer is returned.
+	 */
+
+	pwent.pw_name = fields[0];
+	pwent.pw_passwd = fields[1];
+	if (fields[2][0] == '\0' ||
+		((pwent.pw_uid = strtol (fields[2], &ep, 10)) == 0 && *ep)) {
+		return 0;
+	}
+	if (fields[3][0] == '\0' ||
+		((pwent.pw_gid = strtol (fields[3], &ep, 10)) == 0 && *ep)) {
+		return 0;
+	}
+#ifdef	ATT_AGE
+	cp = pwent.pw_passwd;
+	while (*cp && *cp != ',')
+		++cp;
+
+	if (*cp) {
+		*cp++ = '\0';
+		pwent.pw_age = cp;
+	} else {
+		cp = 0;
+		pwent.pw_age = "";
+	}
+#endif
+	pwent.pw_gecos = fields[4];
+#ifdef	ATT_COMMENT
+	pwent.pw_comment = "";
+#endif
+	pwent.pw_dir = fields[5];
+	pwent.pw_shell = fields[6];
+
+	return &pwent;
+}