init

1 files changed, 63 insertions, 0 deletions

diff --git a/lib/line.c b/lib/line.c
new file mode 100644
index 0000000..6c2e16e
--- /dev/null
+++ b/lib/line.c
@@ -0,0 +1,63 @@
+/* line.c: return the next line from a file, or NULL.
+
+Copyright (C) 1992 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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#include "config.h"
+
+
+#define BLOCK_SIZE 40
+
+char *
+read_line (f)
+    FILE *f;
+{
+  int c;
+  unsigned limit = BLOCK_SIZE;
+  unsigned loc = 0;
+  char *line = (char *) xmalloc (limit);
+  
+  while ((c = getc (f)) != EOF && c != '\n')
+    {
+      line[loc] = c;
+      loc++;
+      
+      /* By testing after the assignment, we guarantee that we'll always
+         have space for the null we append below.  We know we always
+         have room for the first char, since we start with BLOCK_SIZE.  */
+      if (loc == limit)
+        {
+          limit += BLOCK_SIZE;
+          line = (char *) xrealloc (line, limit);
+        }
+    }
+  
+  /* If we read anything, return it.  This can't represent a last
+     ``line'' which doesn't end in a newline, but so what.  */
+  if (c != EOF)
+    {
+      /* Terminate the string.  We can't represent nulls in the file,
+         either.  Again, it doesn't matter.  */
+      line[loc] = 0;
+    }
+  else /* At end of file.  */
+    {
+      free (line);
+      line = NULL;
+    }
+
+  return line;
+}