gestion de buffer a taille variable pour eliminer les pbs de taille static

dans le  code

1 files changed, 82 insertions, 0 deletions

diff --git a/src/ivybuffer.c b/src/ivybuffer.c
new file mode 100644
index 0000000..05b4ed1
--- /dev/null
+++ b/src/ivybuffer.c
@@ -0,0 +1,82 @@
+/*
+ *	Ivy, C interface
+ *
+ *	Copyright 1997-2000
+ *	Centre d'Etudes de la Navigation Aerienne
+ *
+ *	Sockets
+ *
+ *	Authors: Francois-Regis Colin <fcolin@cena.fr>
+ *
+ *	$Id$
+ *
+ *	Please refer to file version.h for the
+ *	copyright notice regarding this software
+ */
+
+#ifdef WIN32
+#include <windows.h>
+#endif
+#include <stdlib.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <string.h>
+
+#include "ivybuffer.h"
+
+#define BUFFER_SIZE 4096	/* taille buffer initiale on multiple par deux a chaque realloc */
+
+// fonction de formtage a la printf d'un buffer avec reallocation dynamique  
+int make_message(IvyBuffer* buffer, const char *fmt, va_list ap)
+{
+    /* Guess we need no more than BUFFER_INIT_SIZE bytes. */
+    int n;
+	if ( buffer->size == 0 || buffer->data == NULL )
+		{
+		buffer->size = BUFFER_SIZE;
+		buffer->offset = 0;
+		buffer->data = malloc (BUFFER_SIZE);
+		if ( buffer->data == NULL )
+			{
+			perror(" Ivy make message MALLOC error: " );
+		    return -1;
+			}
+		}
+    while (1) {
+    /* Try to print in the allocated space. */
+#ifdef WIN32
+	n = _vsnprintf (buffer->data + buffer->offset, buffer->size - buffer->offset, fmt, ap);
+#else
+    n = vsnprintf (buffer->data + buffer->offset, buffer->size - buffer->offset, fmt, ap);
+#endif
+    /* If that worked, return the string size. */
+    if (n > -1 && n < buffer->size)
+	{
+		buffer->offset += n;
+        return n;
+	}
+    /* Else try again with more space. */
+    if (n > -1)    /* glibc 2.1 */
+        buffer->size = n+1; /* precisely what is needed */
+    else           /* glibc 2.0 */
+        buffer->size *= 2;  /* twice the old size */
+    if ((buffer->data = realloc (buffer->data, buffer->size)) == NULL)
+		{
+        perror(" Ivy make message MALLOC error: " );
+		return -1;
+		}
+    }
+}
+int make_message_var(IvyBuffer* buffer, const char *fmt, ... )
+{
+	va_list ap;
+	int len;
+	va_start (ap, fmt );
+	len = make_message (buffer, fmt, ap );
+	va_end (ap );
+	return len;
+}
+
+
+