X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~mdw/git/mLib/blobdiff_plain/97f65b001294338abed02a7b132d6be6517b3f1d..e7d93da8951557085bf18daac69e7b226203988e:/lbuf.h

diff --git a/lbuf.h b/lbuf.h
index 7772885..df8fdff 100644
--- a/lbuf.h
+++ b/lbuf.h
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: lbuf.h,v 1.1 1999/05/14 21:01:14 mdw Exp $
+ * $Id: lbuf.h,v 1.7 2002/01/13 13:32:52 mdw Exp $
  *
  * Block-to-line buffering
  *
@@ -30,13 +30,33 @@
 /*----- Revision history --------------------------------------------------* 
  *
  * $Log: lbuf.h,v $
+ * Revision 1.7  2002/01/13 13:32:52  mdw
+ * Pass line length to line handler function.  Provide a @typedef@ for
+ * handler functions.  Allow run-time configuration of line delimiters.
+ *
+ * Revision 1.6  2001/02/03 16:23:33  mdw
+ * Bug fix: handle a disable during a close-induced flush without dumping
+ * core.
+ *
+ * Revision 1.5  2001/01/20 12:06:01  mdw
+ * Define flags with macros, to ensure unsignedness.
+ *
+ * Revision 1.4  2000/06/17 10:38:14  mdw
+ * Add support for variable buffer sizes.
+ *
+ * Revision 1.3  1999/12/10 23:42:04  mdw
+ * Change header file guard names.
+ *
+ * Revision 1.2  1999/05/17 20:36:08  mdw
+ * Make the magical constants for the buffer flags uppercase.
+ *
  * Revision 1.1  1999/05/14 21:01:14  mdw
  * Integrated `select' handling bits from the background resolver project.
  *
  */
 
-#ifndef LBUF_H
-#define LBUF_H
+#ifndef MLIB_LBUF_H
+#define MLIB_LBUF_H
 
 #ifdef __cplusplus
   extern "C" {
@@ -87,6 +107,10 @@
 
 #include <stddef.h>
 
+#ifndef MLIB_ARENA_H
+#  include "arena.h"
+#endif
+
 /*----- Data structures ---------------------------------------------------*/
 
 /* --- The buffer structure --- *
@@ -96,17 +120,28 @@
  * that.
  */
 
+struct lbuf;
+
+typedef void lbuf_func(char */*s*/, size_t /*len*/, void */*p*/);
+
 typedef struct lbuf {
-  void (*func)(char */*s*/, void */*p*/); /* Handler function */
+  lbuf_func *func;			/* Handler function */
   void *p;				/* Argument for handler */
   size_t len;				/* Length of data in buffer */
+  size_t sz;				/* Buffer size */
+  unsigned delim;			/* Delimiter to look for */
   unsigned f;				/* Various useful state flags */
-  char buf[256];			/* The actual buffer */
+  arena *a;				/* Memory allocation arena */
+  char *buf;				/* The actual buffer */
 } lbuf;
 
+#define LBUF_CR 1u			/* Read a carriage return */
+#define LBUF_ENABLE 2u			/* Buffer is currently enabled */
+#define LBUF_CLOSE 4u			/* Buffer is now closed */
+
 enum {
-  lbuf_cr = 1,				/* Read a carriage return */
-  lbuf_enable = 2			/* Buffer is currently enabled */
+  LBUF_CRLF = 256,
+  LBUF_STRICTCRLF = 257
 };
 
 /*----- Functions provided ------------------------------------------------*/
@@ -180,10 +215,22 @@ extern size_t lbuf_free(lbuf */*b*/, char **/*p*/);
 
 extern void lbuf_snarf(lbuf */*b*/, const void */*p*/, size_t /*sz*/);
 
+/* --- @lbuf_setsize@ --- *
+ *
+ * Arguments:	@lbuf *b@ = pointer to buffer block
+ *		@size_t sz@ = requested maximum line size
+ *
+ * Returns:	---
+ *
+ * Use:		Allocates a buffer of the requested size reading lines.
+ */
+
+extern void lbuf_setsize(lbuf */*b*/, size_t /*sz*/);
+
 /* --- @lbuf_init@ --- *
  *
  * Arguments:	@lbuf *b@ = pointer to buffer block
- *		@void (*func)(char *s, void *p)@ = handler function
+ *		@lbuf_func *func@ = handler function
  *		@void *p@ = argument pointer for @func@
  *
  * Returns:	---
@@ -192,9 +239,18 @@ extern void lbuf_snarf(lbuf */*b*/, const void */*p*/, size_t /*sz*/);
  *		passed to @func@ for processing.
  */
 
-extern void lbuf_init(lbuf */*b*/,
-		      void (*/*func*/)(char */*s*/, void */*p*/),
-		      void */*p*/);
+extern void lbuf_init(lbuf */*b*/, lbuf_func */*func*/, void */*p*/);
+
+/* --- @lbuf_destroy@ --- *
+ *
+ * Arguments:	@lbuf *b@ = pointer to buffer block
+ *
+ * Returns:	---
+ *
+ * Use:		Deallocates a line buffer and frees any resources it owned.
+ */
+
+extern void lbuf_destroy(lbuf */*b*/);
 
 /*----- That's all, folks -------------------------------------------------*/