1 files changed, 97 insertions, 0 deletions
diff --git a/src/sys/stdlib/vasprintf.c b/src/sys/stdlib/vasprintf.c
new file mode 100644
index 0000000..f767645
--- /dev/null
+++ b/src/sys/stdlib/vasprintf.c
@@ -0,0 +1,97 @@
+/* Like vsprintf but provides a pointer to malloc'd storage, which must
+   be freed by the caller.
+   Copyright (C) 1994 Free Software Foundation, Inc.
+
+This file is part of the libiberty library.
+Libiberty is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public
+License as published by the Free Software Foundation; either
+version 2 of the License, or (at your option) any later version.
+
+Libiberty is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with libiberty; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <stdlib.h>
+#include <stdarg.h>
+
+static int int_vasprintf(char **result, const char *format, va_list *args)
+{
+	const char *p = format;
+	/* Add one to make sure that it is never zero, which might cause malloc
+	 to return NULL.  */
+	int total_width = strlen (format) + 1;
+	va_list ap;
+
+	memcpy(&ap, args, sizeof(va_list));
+
+	while (*p != '\0') {
+		if (*p++ == '%') {
+			while (strchr ("-+ #0", *p))
+				++p;
+			if (*p == '*') {
+				++p;
+				total_width += abs(va_arg (ap, int));
+			} else
+				total_width += strtoul(p, (char **) &p, 10);
+			if (*p == '.') {
+				++p;
+				if (*p == '*') {
+					++p;
+					total_width += abs (va_arg (ap, int));
+				} else
+					total_width += strtoul(p, (char **) &p, 10);
+			}
+			while (strchr ("hlL", *p))
+				++p;
+			/* Should be big enough for any format specifier except %s and floats.  */
+			total_width += 30;
+			switch (*p) {
+			case 'd':
+			case 'i':
+			case 'o':
+			case 'u':
+			case 'x':
+			case 'X':
+			case 'c':
+				(void) va_arg (ap, int);
+				break;
+			case 'f':
+			case 'e':
+			case 'E':
+			case 'g':
+			case 'G':
+				(void) va_arg (ap, double);
+				/* Since an ieee double can have an exponent of 307, we'll
+				 make the buffer wide enough to cover the gross case. */
+				total_width += 307;
+				break;
+			case 's':
+				total_width += strlen (va_arg (ap, char *));
+				break;
+			case 'p':
+			case 'n':
+				(void) va_arg (ap, char *);
+				break;
+			}
+		}
+	}
+	*result = (char*)malloc (total_width);
+	return vsprintf (*result, format, *args);
+}
+
+int vasprintf(char **result, const char *format, va_list args);
+int vasprintf(char **result, const char *format, va_list args)
+{
+	return int_vasprintf (result, format, &args);
+}