lavu: add snprintf(), vsnprint() and strtod() replacements for MS runtime.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 46 insertions, 0 deletions

diff --git a/compat/snprintf.h b/compat/snprintf.h
new file mode 100644
index 0000000000..60c198b7fc
--- /dev/null
+++ b/compat/snprintf.h
@@ -0,0 +1,46 @@
+/*
+ * C99-compatible snprintf() and vsnprintf() implementations
+ * Copyright (c) 2012 Ronald S. Bultje <rsbultje@gmail.com>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVCOMPAT_SNPRINTF_H
+#define AVCOMPAT_SNPRINTF_H
+
+#include <stdarg.h>
+#include <stdio.h>
+
+/*
+ * snprintf() on MSVCRT returns -1 (instead of required buffer length)
+ * if the input buffer isn't big enough. Also, if the required buffer
+ * length is exactly identical to the input buffer size, or if the
+ * return value is -1 because the input buffer isn't big enough, MSVCRT
+ * will fail to NULL-terminate the output buffer. vsnprintf() has the
+ * same issue.
+ *
+ * Thus, provide our own fallback wrappers with correct behaviour.
+ */
+#undef snprintf
+#define snprintf avpriv_snprintf
+int snprintf(char *restrict s, size_t n, const char *restrict format, ...);
+
+#undef vsnprintf
+#define vsnprintf avpriv_vsnprintf
+int vsnprintf(char *restrict s, size_t n, const char *restrict format, va_list ap);
+
+#endif /* AVCOMPAT_SNPRINTF_H */