[glibc] pwd: Implement fgetpwent_r using __nss_fgetent_r

[glibc] pwd: Implement fgetpwent_r using __nss_fgetent_r

[Florian Weimer]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=ee1c062be09da006e82ab34c1c9b5c82dd2af92c

commit ee1c062be09da006e82ab34c1c9b5c82dd2af92c
Author: Florian Weimer <fweimer@redhat.com>
Date:   Thu Jul 16 17:34:19 2020 +0200

    pwd: Implement fgetpwent_r using __nss_fgetent_r
    
    Tested-by: Carlos O'Donell <carlos@redhat.com>
    Reviewed-by: Carlos O'Donell <carlos@redhat.com>

Diff:
---
 pwd/fgetpwent_r.c | 43 ++++++-------------------------------------
 1 file changed, 6 insertions(+), 37 deletions(-)

diff --git a/pwd/fgetpwent_r.c b/pwd/fgetpwent_r.c
index 26b0ee52aa..0a2e4a55e2 100644
--- a/pwd/fgetpwent_r.c
+++ b/pwd/fgetpwent_r.c
@@ -20,9 +20,6 @@
 #include <stdio.h>
 #include <pwd.h>
 
-#define flockfile(s) _IO_flockfile (s)
-#define funlockfile(s) _IO_funlockfile (s)
-
 /* Define a line parsing function using the common code
    used in the nss_files module.  */
 
@@ -72,39 +69,11 @@ int
 __fgetpwent_r (FILE *stream, struct passwd *resbuf, char *buffer,
 	       size_t buflen, struct passwd **result)
 {
-  char *p;
-
-  flockfile (stream);
-  do
-    {
-      buffer[buflen - 1] = '\xff';
-      p = fgets_unlocked (buffer, buflen, stream);
-      if (p == NULL && feof_unlocked (stream))
-	{
-	  funlockfile (stream);
-	  *result = NULL;
-	  __set_errno (ENOENT);
-	  return errno;
-	}
-      if (p == NULL || buffer[buflen - 1] != '\xff')
-	{
-	  funlockfile (stream);
-	  *result = NULL;
-	  __set_errno (ERANGE);
-	  return errno;
-	}
-
-      /* Skip leading blanks.  */
-      while (isspace (*p))
-	++p;
-    } while (*p == '\0' || *p == '#' /* Ignore empty and comment lines.  */
-	     /* Parse the line.  If it is invalid, loop to
-		get the next line of the file to parse.  */
-	     || ! parse_line (p, resbuf, (void *) buffer, buflen, &errno));
-
-  funlockfile (stream);
-
-  *result = resbuf;
-  return 0;
+  int ret = __nss_fgetent_r (stream, resbuf, buffer, buflen, parse_line);
+  if (ret == 0)
+    *result = resbuf;
+  else
+    *result = NULL;
+  return ret;
 }
 weak_alias (__fgetpwent_r, fgetpwent_r)