1 files changed, 49 insertions, 0 deletions
diff --git a/lib/vsnprintf.c b/lib/vsnprintf.c
new file mode 100644
index 0000000..f5ae2fe
--- /dev/null
+++ b/lib/vsnprintf.c
@@ -0,0 +1,49 @@
+/*
+ * vsnprintf()
+ *
+ * Poor substitute for a real vsnprintf() function for systems
+ * that don't have them...
+ */
+
+#include "compiler.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+
+#include "nasmlib.h"
+
+#define BUFFER_SIZE	65536	/* Bigger than any string we might print... */
+
+static char snprintf_buffer[BUFFER_SIZE];
+
+int vsnprintf(char *str, size_t size, const char *format, va_list ap)
+{
+    int rv, bytes;
+
+    if (size > BUFFER_SIZE) {
+	nasm_malloc_error(ERR_PANIC|ERR_NOFILE,
+			  "snprintf: size (%d) > BUFFER_SIZE (%d)",
+			  size, BUFFER_SIZE);
+	size = BUFFER_SIZE;
+    }
+
+    rv = vsprintf(snprintf_buffer, format, ap);
+    if (rv >= BUFFER_SIZE) {
+	nasm_malloc_error(ERR_PANIC|ERR_NOFILE,
+			  "snprintf buffer overflow");
+    }
+
+    if (size > 0) {
+	if ((size_t)rv < size-1)
+	    bytes = rv;
+	else
+	    bytes = size-1;
+
+	memcpy(str, snprintf_buffer, bytes);
+	str[bytes] = '\0';
+    }
+
+    return rv;
+}