initial import

stdio/getdelim.c

@@ -0,0 +1,173 @@
+/* Copyright (C) 1991, 1992, 1995 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <ansidecl.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+
+/* Read up to (and including) a TERMINATOR from STREAM into *LINEPTR
+   (and null-terminate it). *LINEPTR is a pointer returned from malloc (or
+   NULL), pointing to *N characters of space.  It is realloc'd as
+   necessary.  Returns the number of characters read (not including the
+   null terminator), or -1 on error or EOF.  */
+
+ssize_t
+DEFUN(__getdelim, (lineptr, n, terminator, stream),
+      char **lineptr AND size_t *n AND int terminator AND FILE *stream)
+{
+  char *line, *p;
+  size_t size, copy;
+
+  if (!__validfp (stream) || lineptr == NULL || n == NULL)
+    {
+      errno = EINVAL;
+      return -1;
+    }
+
+  if (ferror (stream))
+    return -1;
+
+  /* Make sure we have a line buffer to start with.  */
+  if (*lineptr == NULL || *n < 2) /* !seen and no buf yet need 2 chars.  */
+    {
+#ifndef	MAX_CANON
+#define	MAX_CANON	256
+#endif
+      line = realloc (*lineptr, MAX_CANON);
+      if (line == NULL)
+	return -1;
+      *lineptr = line;
+      *n = MAX_CANON;
+    }
+
+  line = *lineptr;
+  size = *n;
+
+  copy = size;
+  p = line;
+
+  if (stream->__buffer == NULL && stream->__userbuf)
+    {
+      /* Unbuffered stream.  Not much optimization to do.  */
+
+      while (1)
+	{
+	  size_t len;
+
+	  while (--copy > 0)
+	    {
+	      register int c = getc (stream);
+	      if (c == EOF)
+		goto lose;
+	      else if ((*p++ = c) == terminator)
+		goto win;
+	    }
+
+	  /* Need to enlarge the line buffer.  */
+	  len = p - line;
+	  size *= 2;
+	  line = realloc (line, size);
+	  if (line == NULL)
+	    goto lose;
+	  *lineptr = line;
+	  *n = size;
+	  p = line + len;
+	  copy = size - len;
+	}
+    }
+  else
+    {
+      /* Leave space for the terminating null.  */
+      --copy;
+
+      if (!stream->__seen || stream->__buffer == NULL || stream->__pushed_back)
+	{
+	  /* Do one with getc to allocate a buffer.  */
+	  int c = getc (stream);
+	  if (c == EOF)
+	    goto lose;
+	  *p++ = c;
+	  if (c == terminator)
+	    goto win;
+	  --copy;
+	}
+
+      while (1)
+	{
+	  size_t i;
+	  char *found;
+
+	  i = stream->__get_limit - stream->__bufp;	
+	  if (i == 0)
+	    {
+	      /* Refill the buffer.  */
+	      int c = __fillbf (stream);
+	      if (c == EOF)
+		goto lose;
+	      *p++ = c;
+	      if (c == terminator)
+		goto win;
+	      --copy;
+	      i = stream->__get_limit - stream->__bufp;	
+	    }
+
+	  if (i > copy)
+	    i = copy;
+
+	  found = (char *) __memccpy ((PTR) p, stream->__bufp, terminator, i);
+	  if (found != NULL)
+	    {
+	      stream->__bufp += found - p;
+	      p = found;
+	      goto win;
+	    }
+
+	  stream->__bufp += i;
+	  p += i;
+	  copy -= i;
+	  if (copy == 0)
+	    {
+	      /* Need to enlarge the line buffer.  */
+	      size_t len = p - line;
+	      size *= 2;
+	      line = realloc (line, size);
+	      if (line == NULL)
+		goto lose;
+	      *lineptr = line;
+	      *n = size;
+	      p = line + len;
+	      copy = size - len;
+	      /* Leave space for the terminating null.  */
+	      --copy;
+	    }
+	}
+    }
+
+ lose:
+  if (p == *lineptr)
+    return -1;
+  /* Return a partial line since we got an error in the middle.  */
+ win:
+  *p = '\0';
+  return p - *lineptr;
+}
+
+weak_alias (__getdelim, getdelim)