Abort the fstrcmp computation early when a lower bound has been given.

[gnulib.git] / lib / getdelim.c

diff --git a/lib/getdelim.c b/lib/getdelim.c
index 352b597..35cb2d8 100644 (file)
--- a/lib/getdelim.c
+++ b/lib/getdelim.c
@@ -1,5 +1,5 @@
 /* getdelim.c --- Implementation of replacement getdelim function.
-   Copyright (C) 1994, 1996, 1997, 1998, 2001, 2003, 2005, 2006, 2007 Free
+   Copyright (C) 1994, 1996, 1997, 1998, 2001, 2003, 2005, 2006, 2007, 2008 Free
    Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or
@@ -33,18 +33,18 @@
 #ifndef SSIZE_MAX
 # define SSIZE_MAX ((ssize_t) (SIZE_MAX / 2))
 #endif
-#if !HAVE_FLOCKFILE
+
+#if USE_UNLOCKED_IO
+# include "unlocked-io.h"
+# define getc_maybe_unlocked(fp)       getc(fp)
+#elif !HAVE_FLOCKFILE || !HAVE_FUNLOCKFILE || !HAVE_DECL_GETC_UNLOCKED
 # undef flockfile
-# define flockfile(x) ((void) 0)
-#endif
-#if !HAVE_FUNLOCKFILE
 # undef funlockfile
+# define flockfile(x) ((void) 0)
 # define funlockfile(x) ((void) 0)
-#endif
-
-/* Some systems, like OSF/1 4.0 and Woe32, don't have EOVERFLOW.  */
-#ifndef EOVERFLOW
-# define EOVERFLOW E2BIG
+# define getc_maybe_unlocked(fp)       getc(fp)
+#else
+# define getc_maybe_unlocked(fp)       getc_unlocked(fp)
 #endif
 
 /* Read up to (and including) a DELIMITER from FP into *LINEPTR (and
@@ -67,22 +67,24 @@ getdelim (char **lineptr, size_t *n, int delimiter, FILE *fp)
 
   flockfile (fp);
 
-  if (*n == 0)
+  if (*lineptr == NULL || *n == 0)
     {
+      char *new_lineptr;
       *n = 120;
-      *lineptr = (char *) realloc (*lineptr, 120);
-      if (*lineptr == NULL)
+      new_lineptr = (char *) realloc (*lineptr, *n);
+      if (new_lineptr == NULL)
        {
          result = -1;
          goto unlock_return;
        }
+      *lineptr = new_lineptr;
     }
 
   for (;;)
     {
       int i;
 
-      i = getc (fp);
+      i = getc_maybe_unlocked (fp);
       if (i == EOF)
        {
          result = -1;
@@ -127,6 +129,7 @@ getdelim (char **lineptr, size_t *n, int delimiter, FILE *fp)
   result = cur_len ? cur_len : result;
 
  unlock_return:
-  funlockfile (fp);
+  funlockfile (fp); /* doesn't set errno */
+
   return result;
 }