use signal safe ust_safe_snprintf()

[ust.git] / snprintf / snprintf.c

diff --git a/snprintf/snprintf.c b/snprintf/snprintf.c
new file mode 100644 (file)
index 0000000..b0ea5d3
--- /dev/null
+++ b/snprintf/snprintf.c
@@ -0,0 +1,76 @@
+/*     $OpenBSD: snprintf.c,v 1.16 2009/10/22 01:23:16 guenther Exp $ */
+/*-
+ * Copyright (c) 1990, 1993
+ *     The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Chris Torek.
+ *
+ * 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. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
+ */
+
+#include <limits.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdarg.h>
+#include "local.h"
+#include "ust_snprintf.h"
+
+int ust_safe_vsnprintf(char *str, size_t n, const char *fmt, va_list ap)
+{
+       int ret;
+       char dummy;
+       LFILE f;
+       struct __sfileext fext;
+
+       /* While snprintf(3) specifies size_t stdio uses an int internally */
+       if (n > INT_MAX)
+               n = INT_MAX;
+       /* Stdio internals do not deal correctly with zero length buffer */
+       if (n == 0) {
+               str = &dummy;
+               n = 1;
+       }
+       _FILEEXT_SETUP(&f, &fext);
+       f._file = -1;
+       f._flags = __SWR | __SSTR;
+       f._bf._base = f._p = (unsigned char *)str;
+       f._bf._size = f._w = n - 1;
+       ret = ust_safe_vfprintf(&f, fmt, ap);
+       *f._p = '\0';
+       return (ret);
+}
+
+int ust_safe_snprintf(char *str, size_t n, const char *fmt, ...)
+{
+       va_list ap;
+       int ret;
+
+       va_start(ap, fmt);
+       ret = ust_safe_vsnprintf(str, n, fmt, ap);
+       va_end(ap);
+
+       return ret;
+}