1 files changed, 143 insertions, 0 deletions
diff --git a/lib/getndelim2.c b/lib/getndelim2.c
new file mode 100644
index 0000000..9a9e6e7
--- /dev/null
+++ b/lib/getndelim2.c
@@ -0,0 +1,143 @@
+/* getndelim2 - Read a line from a stream, stopping at one of 2 delimiters,
+   with bounded memory allocation.
+
+   Copyright (C) 1993, 1996, 1997, 1998, 2000, 2003, 2004, 2006 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.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+/* Originally written by Jan Brittenson, bson@gnu.ai.mit.edu.  */
+
+#include <config.h>
+
+#include "getndelim2.h"
+
+#include <stdlib.h>
+#include <stddef.h>
+
+#if USE_UNLOCKED_IO
+# include "unlocked-io.h"
+#endif
+
+#include <limits.h>
+#include <stdint.h>
+
+#ifndef SSIZE_MAX
+# define SSIZE_MAX ((ssize_t) (SIZE_MAX / 2))
+#endif
+
+/* The maximum value that getndelim2 can return without suffering from
+   overflow problems, either internally (because of pointer
+   subtraction overflow) or due to the API (because of ssize_t).  */
+#define GETNDELIM2_MAXIMUM (PTRDIFF_MAX < SSIZE_MAX ? PTRDIFF_MAX : SSIZE_MAX)
+
+/* Try to add at least this many bytes when extending the buffer.
+   MIN_CHUNK must be no greater than GETNDELIM2_MAXIMUM.  */
+#define MIN_CHUNK 64
+
+ssize_t
+getndelim2 (char **lineptr, size_t *linesize, size_t offset, size_t nmax,
+            int delim1, int delim2, FILE *stream)
+{
+  size_t nbytes_avail;		/* Allocated but unused bytes in *LINEPTR.  */
+  char *read_pos;		/* Where we're reading into *LINEPTR. */
+  ssize_t bytes_stored = -1;
+  char *ptr = *lineptr;
+  size_t size = *linesize;
+
+  if (!ptr)
+    {
+      size = nmax < MIN_CHUNK ? nmax : MIN_CHUNK;
+      ptr = malloc (size);
+      if (!ptr)
+	return -1;
+    }
+
+  if (size < offset)
+    goto done;
+
+  nbytes_avail = size - offset;
+  read_pos = ptr + offset;
+
+  if (nbytes_avail == 0 && nmax <= size)
+    goto done;
+
+  for (;;)
+    {
+      /* Here always ptr + size == read_pos + nbytes_avail.  */
+
+      int c;
+
+      /* We always want at least one byte left in the buffer, since we
+	 always (unless we get an error while reading the first byte)
+	 NUL-terminate the line buffer.  */
+
+      if (nbytes_avail < 2 && size < nmax)
+	{
+	  size_t newsize = size < MIN_CHUNK ? size + MIN_CHUNK : 2 * size;
+	  char *newptr;
+
+	  if (! (size < newsize && newsize <= nmax))
+	    newsize = nmax;
+
+	  if (GETNDELIM2_MAXIMUM < newsize - offset)
+	    {
+	      size_t newsizemax = offset + GETNDELIM2_MAXIMUM + 1;
+	      if (size == newsizemax)
+		goto done;
+	      newsize = newsizemax;
+	    }
+
+	  nbytes_avail = newsize - (read_pos - ptr);
+	  newptr = realloc (ptr, newsize);
+	  if (!newptr)
+	    goto done;
+	  ptr = newptr;
+	  size = newsize;
+	  read_pos = size - nbytes_avail + ptr;
+	}
+
+      c = getc (stream);
+      if (c == EOF)
+	{
+	  /* Return partial line, if any.  */
+	  if (read_pos == ptr)
+	    goto done;
+	  else
+	    break;
+	}
+
+      if (nbytes_avail >= 2)
+	{
+	  *read_pos++ = c;
+	  nbytes_avail--;
+	}
+
+      if (c == delim1 || c == delim2)
+	/* Return the line.  */
+	break;
+    }
+
+  /* Done - NUL terminate and return the number of bytes read.
+     At this point we know that nbytes_avail >= 1.  */
+  *read_pos = '\0';
+
+  bytes_stored = read_pos - (ptr + offset);
+
+ done:
+  *lineptr = ptr;
+  *linesize = size;
+  return bytes_stored;
+}