From d87ecf5dd02e69e978395e125db6380158aae308 Mon Sep 17 00:00:00 2001
From: Alejandro Colomar <alx@kernel.org>
Date: Sat, 7 Dec 2024 22:01:08 +0100
Subject: [PATCH] lib/: Remove arbitrary limitation by calling strdup(3)

This makes these APIs more consistent with the ones for groups,
which strdup(3) memory as necessary.

It also makes the code simpler.

Signed-off-by: Alejandro Colomar <alx@kernel.org>
---
 lib/sgetpwent.c | 25 +++++++++----------------
 lib/sgetspent.c | 20 +++++++-------------
 2 files changed, 16 insertions(+), 29 deletions(-)

diff --git a/lib/sgetpwent.c b/lib/sgetpwent.c
index b13d5bc54..e155ed0a0 100644
--- a/lib/sgetpwent.c
+++ b/lib/sgetpwent.c
@@ -11,10 +11,11 @@
 
 #ident "$Id$"
 
-#include <sys/types.h>
-#include <stdio.h>
 #include <pwd.h>
+#include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
+#include <sys/types.h>
 
 #include "atoi/getnum.h"
 #include "defines.h"
@@ -38,26 +39,18 @@
  *	compilation glarp to improve on this in the future.
  */
 struct passwd *
-sgetpwent(const char *buf)
+sgetpwent(const char *s)
 {
+	static char  *pwdbuf = NULL;
 	static struct passwd pwent;
-	static char pwdbuf[PASSWD_ENTRY_MAX_LENGTH];
 	int i;
 	char *cp;
 	char *fields[NFIELDS];
 
-	/*
-	 * Copy the string to a static buffer so the pointers into
-	 * the password structure remain valid.
-	 */
-
-	if (strlen (buf) >= sizeof pwdbuf) {
-		fprintf (shadow_logfd,
-		         "%s: Too long passwd entry encountered, file corruption?\n",
-		         shadow_progname);
-		return NULL;	/* fail if too long */
-	}
-	strcpy (pwdbuf, buf);
+	free(pwdbuf);
+	pwdbuf = strdup(s);
+	if (pwdbuf == NULL)
+		return NULL;
 
 	/*
 	 * Save a pointer to the start of each colon separated
diff --git a/lib/sgetspent.c b/lib/sgetspent.c
index db85cd024..8d58f5204 100644
--- a/lib/sgetspent.c
+++ b/lib/sgetspent.c
@@ -16,6 +16,7 @@
 
 #include <stddef.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <sys/types.h>
 #include <string.h>
 
@@ -36,26 +37,19 @@
  * sgetspent - convert string in shadow file format to (struct spwd *)
  */
 struct spwd *
-sgetspent(const char *string)
+sgetspent(const char *s)
 {
-	static char spwbuf[PASSWD_ENTRY_MAX_LENGTH];
+	static char  *spwbuf = NULL;
 	static struct spwd spwd;
 	char *fields[FIELDS];
 	char *cp;
 	int i;
 
-	/*
-	 * Copy string to local buffer.  It has to be tokenized and we
-	 * have to do that to our private copy.
-	 */
+	free(spwbuf);
+	spwbuf = strdup(s);
+	if (spwbuf == NULL)
+		return NULL;
 
-	if (strlen (string) >= sizeof spwbuf) {
-		fprintf (shadow_logfd,
-		         "%s: Too long passwd entry encountered, file corruption?\n",
-		         shadow_progname);
-		return NULL;	/* fail if too long */
-	}
-	strcpy (spwbuf, string);
 	stpsep(spwbuf, "\n");
 
 	/*
-- 
2.47.2