Imported from ../bash-4.0-rc1.tar.gz.

lib/sh/zgetline.c

@@ -0,0 +1,115 @@
+/* zgetline - read a line of input from a specified file descriptor and return
+	      a pointer to a newly-allocated buffer containing the data. */
+
+/* Copyright (C) 2008,2009 Free Software Foundation, Inc.
+
+   This file is part of GNU Bash, the Bourne Again SHell.
+
+   Bash 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 3 of the License, or
+   (at your option) any later version.
+
+   Bash 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 Bash.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <config.h>
+
+#include <sys/types.h>
+
+#if defined (HAVE_UNISTD_H)
+#  include <unistd.h>
+#endif
+
+#include <errno.h>
+#include "xmalloc.h"
+
+#if !defined (errno)
+extern int errno;
+#endif
+
+extern ssize_t zread __P((int, char *, size_t));
+extern ssize_t zreadc __P((int, char *));
+
+/* Initial memory allocation for automatic growing buffer in zreadlinec */
+#define GET_LINE_INITIAL_ALLOCATION 16
+
+/* Derived from GNU libc's getline.
+   The behavior is almost the same as getline. See man getline.
+   The differences are
+   	(1) using file descriptor instead of FILE *,
+	(2) the order of arguments; the file descriptor comes the first, and
+	(3) the addtion of thired argument, UNBUFFERED_READ; this argument
+	    controls whether get_line uses buffering or not to get a byte data
+	    from FD. get_line uses zreadc if UNBUFFERED_READ is zero; and
+	    uses zread if UNBUFFERED_READ is non-zero.
+
+   Returns number of bytes read or -1 on error. */
+
+ssize_t
+zgetline (fd, lineptr, n, unbuffered_read)
+     int fd;
+     char **lineptr;
+     size_t *n;
+     int unbuffered_read;
+{
+  int nr, retval;
+  char *line, c;
+
+  if (lineptr == 0 || n == 0 || (*lineptr == 0 && *n != 0))
+    return -1;
+
+  nr = 0;
+  line = *lineptr;
+  
+  while (1)
+    {
+      retval = unbuffered_read ? zread (fd, &c, 1) : zreadc(fd, &c);
+
+      if (retval <= 0)
+	{
+	  line[nr] = '\0';
+	  break;
+	}
+
+      if (nr + 2 >= *n)
+	{
+	 size_t new_size;
+
+	 new_size = (*n == 0) ? GET_LINE_INITIAL_ALLOCATION : *n * 2;
+	 line = xrealloc (*lineptr, new_size);
+
+	 if (line)
+	   {
+	     *lineptr = line;
+	     *n = new_size;
+	   }
+	 else
+	   {
+	     if (*n > 0)
+	       {
+		 (*lineptr)[*n - 1] = '\0';
+		 nr = *n - 2;
+	       }
+	     break;
+	   }
+	}
+
+      line[nr] = c;
+      nr++;
+
+      if (c == '\n')
+	{
+	  line[nr] = '\0';
+	  break;
+	}
+    }
+
+  return nr - 1;
+}