Implement asprintf(3) and vasprintf(3) functions similar to the

ones in the glibc.  Some man pages changes from FreeBSD
(asprintf.c/vasprintf.c are not based on GNU or FreeBSD code).

1 files changed, 67 insertions, 0 deletions

diff --git a/lib/libc/stdio/vasprintf.c b/lib/libc/stdio/vasprintf.c
new file mode 100644
index 00000000000..e11f33b7dff
--- /dev/null
+++ b/lib/libc/stdio/vasprintf.c
@@ -0,0 +1,67 @@
+/*	$OpenBSD: vasprintf.c,v 1.1 1997/11/29 19:54:47 millert Exp $	*/
+
+/*
+ * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by Todd C. Miller.
+ * 4. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
+ * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char rcsid[] = "$OpenBSD: vasprintf.c,v 1.1 1997/11/29 19:54:47 millert Exp $";
+#endif /* LIBC_SCCS and not lint */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+
+int
+vasprintf(str, fmt, ap)
+	char **str;
+	const char *fmt;
+	_BSD_VA_LIST_ ap;
+{
+	int ret;
+	FILE f;
+
+	f._flags = __SWR | __SSTR | __SALC;
+	f._bf._base = f._p = (unsigned char *)malloc(128);
+	if (f._bf._base == NULL) {
+		*str = NULL;
+		errno = ENOMEM;
+		return (-1);
+	}
+	f._bf._size = f._w = 127;		/* Leave room for the NULL */
+	ret = vfprintf(&f, fmt, ap);
+	*f._p = '\0';
+	f._bf._base = realloc(f._bf._base, f._bf._size + 1);
+	if (f._bf._base == NULL) {
+		errno = ENOMEM;
+		ret = -1;
+	}
+	*str = f._bf._base;
+	return (ret);
+}