X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Flinebuffer.c;h=77f2a047a409e616046608a62e81ec2e9b94595b;hb=024eeefda59f214eeaac745db9f3e982b9a726c3;hp=c1a696acc9067ad9919ae71322a463d6f5b206da;hpb=04e03d50238a919e565b95c17fcff84f2061d2e0;p=gnulib.git

diff --git a/lib/linebuffer.c b/lib/linebuffer.c
index c1a696acc..77f2a047a 100644
--- a/lib/linebuffer.c
+++ b/lib/linebuffer.c
@@ -1,5 +1,7 @@
 /* linebuffer.c -- read arbitrarily long lines
-   Copyright (C) 1986, 1991, 1998 Free Software Foundation, Inc.
+
+   Copyright (C) 1986, 1991, 1998, 1999, 2001, 2003, 2004, 2006, 2007
+   Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -13,80 +15,90 @@
 
    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software Foundation,
-   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
 
 /* Written by Richard Stallman. */
-
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
+
+#include <config.h>
 
 #include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
 #include "linebuffer.h"
+#include "xalloc.h"
 
-char *xmalloc ();
-char *xrealloc ();
-void free ();
+#if USE_UNLOCKED_IO
+# include "unlocked-io.h"
+#endif
 
 /* Initialize linebuffer LINEBUFFER for use. */
 
 void
 initbuffer (struct linebuffer *linebuffer)
 {
-  linebuffer->length = 0;
-  linebuffer->size = 200;
-  linebuffer->buffer = (char *) xmalloc (linebuffer->size);
+  memset (linebuffer, 0, sizeof *linebuffer);
+}
+
+struct linebuffer *
+readlinebuffer (struct linebuffer *linebuffer, FILE *stream)
+{
+  return readlinebuffer_delim (linebuffer, stream, '\n');
 }
 
 /* Read an arbitrarily long line of text from STREAM into LINEBUFFER.
-   Remove any newline.  Does not null terminate.
-   Return zero upon error or upon end of file.
+   Consider lines to be terminated by DELIMITER.
+   Keep the delimiter; append DELIMITER if it's the last line of a file
+   that ends in a character other than DELIMITER.  Do not NUL-terminate.
+   Therefore the stream can contain NUL bytes, and the length
+   (including the delimiter) is returned in linebuffer->length.
+   Return NULL when stream is empty.  Return NULL and set errno upon
+   error; callers can distinguish this case from the empty case by
+   invoking ferror (stream).
    Otherwise, return LINEBUFFER.  */
-
 struct linebuffer *
-readline (struct linebuffer *linebuffer, FILE *stream)
+readlinebuffer_delim (struct linebuffer *linebuffer, FILE *stream,
+		      char delimiter)
 {
   int c;
   char *buffer = linebuffer->buffer;
   char *p = linebuffer->buffer;
   char *end = buffer + linebuffer->size; /* Sentinel. */
 
-  if (feof (stream) || ferror (stream))
-    {
-      linebuffer->length = 0;
-      return 0;
-    }
+  if (feof (stream))
+    return NULL;
 
-  while (1)
+  do
     {
       c = getc (stream);
+      if (c == EOF)
+	{
+	  if (p == buffer || ferror (stream))
+	    return NULL;
+	  if (p[-1] == delimiter)
+	    break;
+	  c = delimiter;
+	}
       if (p == end)
 	{
-	  linebuffer->size *= 2;
-	  buffer = (char *) xrealloc (buffer, linebuffer->size);
-	  p += buffer - linebuffer->buffer;
+	  size_t oldsize = linebuffer->size;
+	  buffer = x2realloc (buffer, &linebuffer->size);
+	  p = buffer + oldsize;
 	  linebuffer->buffer = buffer;
 	  end = buffer + linebuffer->size;
 	}
-      if (c == EOF || c == '\n')
-	break;
       *p++ = c;
     }
+  while (c != delimiter);
 
-  if (feof (stream) && p == buffer)
-    {
-      linebuffer->length = 0;
-      return 0;
-    }
-  linebuffer->length = p - linebuffer->buffer;
+  linebuffer->length = p - buffer;
   return linebuffer;
 }
 
-/* Free linebuffer LINEBUFFER and its data, all allocated with malloc. */
+/* Free the buffer that was allocated for linebuffer LINEBUFFER.  */
 
 void
 freebuffer (struct linebuffer *linebuffer)
 {
   free (linebuffer->buffer);
-  free (linebuffer);
 }