Add support for variable buffer sizes.

[mLib] / selbuf.c

diff --git a/selbuf.c b/selbuf.c
index aafe711f59dbec1ad86b9078b606a3b9aa4b31fc..9acc65ff877c61156707121f54531e8d70320302 100644 (file)
--- a/selbuf.c
+++ b/selbuf.c
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: selbuf.c,v 1.2 1999/05/17 20:36:50 mdw Exp $
+ * $Id: selbuf.c,v 1.4 2000/06/17 10:38:14 mdw Exp $
  *
  * Line-buffering select handler
  *
@@ -30,6 +30,12 @@
 /*----- Revision history --------------------------------------------------* 
  *
  * $Log: selbuf.c,v $
+ * Revision 1.4  2000/06/17 10:38:14  mdw
+ * Add support for variable buffer sizes.
+ *
+ * Revision 1.3  1999/05/22 13:41:00  mdw
+ * Fix end-of-file detection and error handling.
+ *
  * Revision 1.2  1999/05/17 20:36:50  mdw
  * Make the magical constants for the buffer flags uppercase.
  *
@@ -111,23 +117,36 @@ static void selbuf_read(int fd, unsigned mode, void *vp)
   int n;
 
   sz = lbuf_free(&b->b, &p);
-again:
   n = read(fd, p, sz);
-  if (n <= 0) {
-    switch (errno) {
-      case EINTR:
-       goto again;
-      case EAGAIN:
+  if (n == 0)
+    lbuf_close(&b->b);
+  else if (n > 0)
+    lbuf_flush(&b->b, p, n);
+  else switch (errno) {
+    case EINTR:
+    case EAGAIN:
 #if EAGAIN != EWOULDBLOCK
-      case EWOULDBLOCK:
+    case EWOULDBLOCK:
 #endif
-       return;
-      default:
-       lbuf_close(&b->b);
-    }
+      return;
+    default:
+      lbuf_close(&b->b);
   }
-  else
-    lbuf_flush(&b->b, p, n);
+}
+
+/* --- @selbuf_setsize@ --- *
+ *
+ * Arguments:  @selbuf *b@ = pointer to buffer block
+ *             @size_t sz@ = size of buffer
+ *
+ * Returns:    ---
+ *
+ * Use:                Sets the size of the buffer used for reading lines.
+ */
+
+void selbuf_setsize(selbuf *b, size_t sz)
+{
+  lbuf_setsize(&b->b, sz);
 }
 
 /* --- @selbuf_init@ --- *
@@ -155,4 +174,19 @@ void selbuf_init(selbuf *b,
   selbuf_enable(b);
 }
 
+/* --- @selbuf_destroy@ --- *
+ *
+ * Arguments:  @selbuf *b@ = pointer to buffer block
+ *
+ * Returns:    ---
+ *
+ * Use:                Deallocates a line buffer and frees any resources it owned.
+ */
+
+void selbuf_destroy(selbuf *b)
+{
+  selbuf_disable(b);
+  lbuf_destroy(&b->b);
+}
+
 /*----- That's all, folks -------------------------------------------------*/