From c3d20eba96e9c26f775f3abf5ca6edcbd8c23963 Mon Sep 17 00:00:00 2001
From: Joel Sherrill <joel.sherrill@OARcorp.com>
Date: Fri, 2 Jul 1999 18:03:43 +0000
Subject: Reentrant versions added by Joel.  Signficant formatting cleanup.

---
 c/src/lib/libc/getgrent.c | 136 ++++++++++++++++++++++++++++------------------
 1 file changed, 84 insertions(+), 52 deletions(-)

(limited to 'c/src/lib/libc/getgrent.c')

diff --git a/c/src/lib/libc/getgrent.c b/c/src/lib/libc/getgrent.c
index 080187d178..d0a92a0b80 100644
--- a/c/src/lib/libc/getgrent.c
+++ b/c/src/lib/libc/getgrent.c
@@ -11,7 +11,7 @@
 #include <string.h>
 #include <limits.h>
 
-static struct group gr_group;	/* password structure */
+static struct group gr_group;    /* password structure */
 static FILE *group_fp;
 
 static char groupname[8];
@@ -19,70 +19,102 @@ static char password[1024];
 static char groups[1024];
 static char *gr_mem[16] = { } ;
 
-struct group *
-getgrnam (name)
-     const char *name;
+int getgrnam_r(
+  const char     *name,
+  struct group   *grp,
+  char           *buffer,
+  size_t          bufsize,
+  struct group  **result
+)
 {
   FILE *fp;
-  char buf[1024];
-
-  if ((fp = fopen ("/etc/group", "r")) == NULL)
-    {
-      return NULL;
-    }
 
-  while (fgets (buf, sizeof (buf), fp))
-    {
-      sscanf (buf, "%[^:]:%[^:]:%d:%s\n",
-	      groupname, password, &gr_group.gr_gid,
-	      groups);
-      gr_group.gr_name = groupname;
-      gr_group.gr_passwd = password;
-      gr_group.gr_mem = gr_mem ;
-      
-      if (!strcmp (groupname, name))
-	{
-	  fclose (fp);
-	  return &gr_group;
-	}
+  if ((fp = fopen ("/etc/group", "r")) == NULL) {
+    errno = EINVAL;
+    return -1;
+  }
+
+  while (fgets (buffer, bufsize, fp)) {
+    sscanf (buffer, "%[^:]:%[^:]:%d:%s\n",
+      groupname, password, &grp->gr_gid,
+      groups);
+    grp->gr_name = groupname;
+    grp->gr_passwd = password;
+    grp->gr_mem = gr_mem ;
+    
+    if (!strcmp (groupname, name)) {
+      fclose (fp);
+      *result = grp;
+      return 0;
     }
+  }
   fclose (fp);
-  return NULL;
+  errno = EINVAL;
+  return -1;
+}
+
+struct group *getgrnam(
+  const char *name
+)
+{
+  char   buf[1024];
+  struct group *g;
+
+  if ( getgrnam_r( name, &gr_group, buf, 1024, &g ) )
+    return NULL;
+
+  return g;
 }
 
-struct group *
-getgrgid (gid_t gid)
+int getgrgid_r(
+  gid_t           gid,
+  struct group   *grp,
+  char           *buffer,
+  size_t          bufsize,
+  struct group  **result
+)
 {
   FILE *fp;
-  char buf[1024];
 
-  if ((fp = fopen ("/etc/group", "r")) == NULL)
-    {
-      return NULL;
-    }
+  if ((fp = fopen ("/etc/group", "r")) == NULL) {
+    errno = EINVAL;
+    return -1;
+  }
+
+  while (fgets (buffer, bufsize, fp)) {
+    sscanf (buffer, "%[^:]:%[^:]:%d:%s\n",
+      groupname, password, &gr_group.gr_gid,
+      groups);
+    gr_group.gr_name = groupname;
+    gr_group.gr_passwd = password;
+    gr_group.gr_mem = gr_mem ;
+
 
-  while (fgets (buf, sizeof (buf), fp))
-    {
-      sscanf (buf, "%[^:]:%[^:]:%d:%s\n",
-	      groupname, password, &gr_group.gr_gid,
-	      groups);
-      gr_group.gr_name = groupname;
-      gr_group.gr_passwd = password;
-      gr_group.gr_mem = gr_mem ;
-
-
-      if (gid == gr_group.gr_gid)
-	{
-	  fclose (fp);
-	  return &gr_group;
-	}
+    if (gid == gr_group.gr_gid) {
+      fclose (fp);
+      *result = grp;
+      return 0;
     }
+  }
   fclose (fp);
-  return NULL;
+  errno = EINVAL;
+  return -1;
+}
+
+struct group *getgrgid (
+  gid_t gid
+)
+{
+  char   buf[1024];
+  struct group *g;
+
+  if ( getgrgid_r( gid, &gr_group, buf, 1024, &g ) )
+    return NULL;
+
+  return g;
 }
 
-struct group *
-getgrent ()
+struct group *getgrent( void )
 {
   char buf[1024];
 
@@ -93,8 +125,8 @@ getgrent ()
     return NULL;
 
   sscanf (buf, "%[^:]:%[^:]:%d:%s\n",
-	  groupname, password, &gr_group.gr_gid,
-	  groups);
+    groupname, password, &gr_group.gr_gid,
+    groups);
   gr_group.gr_name = groupname;
   gr_group.gr_passwd = password;
   gr_group.gr_mem = gr_mem ;
-- 
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