unix.c (fd_alloc_r_at): Use read() instead of do_read() only in case of special files (e.g.

2005-10-13  Thomas Koenig  <Thomas.Koenig@online.de>

	* io/unix.c(fd_alloc_r_at):  Use read() instead of do_read()
	only in case of special files (e.g. terminals).

From-SVN: r105373

1 files changed, 24 insertions, 6 deletions

diff --git a/libgfortran/io/unix.c b/libgfortran/io/unix.c
index de018af..ea03515 100644
--- a/libgfortran/io/unix.c
+++ b/libgfortran/io/unix.c
@@ -440,7 +440,6 @@ static char *
 fd_alloc_r_at (unix_stream * s, int *len, gfc_offset where)
 {
   gfc_offset m;
-  int n;
 
   if (where == -1)
     where = s->logical_offset;
@@ -462,13 +461,32 @@ fd_alloc_r_at (unix_stream * s, int *len, gfc_offset where)
   if (s->physical_offset != m && lseek (s->fd, m, SEEK_SET) < 0)
     return NULL;
 
-  n = read (s->fd, s->buffer + s->active, s->len - s->active);
-  if (n < 0)
-    return NULL;
+  /* do_read() hangs on read from terminals for *BSD-systems.  Only
+     use read() in that case.  */
+
+  if (s->special_file)
+    {
+      ssize_t n;
+
+      n = read (s->fd, s->buffer + s->active, s->len - s->active);
+      if (n < 0)
+	return NULL;
+
+      s->physical_offset = where + n;
+      s->active += n;
+    }
+  else
+    {
+      size_t n;
 
-  s->physical_offset = where + n;
+      n = s->len - s->active;
+      if (do_read (s, s->buffer + s->active, &n) != 0)
+	return NULL;
+
+      s->physical_offset = where + n;
+      s->active += n;
+    }
 
-  s->active += n;
   if (s->active < *len)
     *len = s->active;		/* Bytes actually available */