/* linebuffer.c -- read arbitrarily long lines
- Copyright (C) 1986, 1991, 1998 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or modify
+ Copyright (C) 1986, 1991, 1998-1999, 2001, 2003-2004, 2006-2007, 2009-2013
+ 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
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
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. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* Written by Richard Stallman. */
-\f
-#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 (linebuffer)
- struct linebuffer *linebuffer;
+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 (linebuffer, stream)
- 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;
- linebuffer->buffer = buffer;
- end = buffer + linebuffer->size;
- }
- if (c == EOF || c == '\n')
- break;
+ {
+ size_t oldsize = linebuffer->size;
+ buffer = x2realloc (buffer, &linebuffer->size);
+ p = buffer + oldsize;
+ linebuffer->buffer = buffer;
+ end = buffer + linebuffer->size;
+ }
*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 (linebuffer)
- struct linebuffer *linebuffer;
+freebuffer (struct linebuffer *linebuffer)
{
free (linebuffer->buffer);
- free (linebuffer);
}