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

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

4 files changed, 239 insertions, 0 deletions

diff --git a/compat/snprintf.c b/compat/snprintf.c
new file mode 100644
index 0000000000..c54c8e201b
--- /dev/null
+++ b/compat/snprintf.c
@@ -0,0 +1,64 @@
+/*
+ * 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
+ */
+
+#include <limits.h>
+#include <string.h>
+
+#include "libavutil/error.h"
+#include "snprintf.h"
+
+#undef snprintf
+int avpriv_snprintf(char *restrict s, size_t n, const char *restrict fmt, ...)
+{
+    va_list ap;
+    int ret;
+
+    va_start(ap, fmt);
+    ret = avpriv_vsnprintf(s, n, fmt, ap);
+    va_end(ap);
+
+    return ret;
+}
+
+#undef vsnprintf
+int avpriv_vsnprintf(char *restrict s, size_t n, const char *restrict fmt,
+                     va_list ap)
+{
+    int ret;
+
+    if (n == 0)
+        return 0;
+    else if (n > INT_MAX)
+        return AVERROR(EINVAL);
+
+    /* we use n - 1 here because if the buffer is not big enough, the MS
+     * runtime libraries don't add a terminating zero at the end. MSDN
+     * recommends to provide _snprintf/_vsnprintf() a buffer size that
+     * is one less than the actual buffer, and zero it before calling
+     * _snprintf/_vsnprintf() to workaround this problem.
+     * See http://msdn.microsoft.com/en-us/library/1kt27hek(v=vs.80).aspx */
+    memset(s, 0, n);
+    ret = vsnprintf(s, n - 1, fmt, ap);
+    if (ret == -1)
+        ret = n;
+
+    return ret;
+}
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 */
diff --git a/compat/strtod.c b/compat/strtod.c
new file mode 100644
index 0000000000..149d18aa92
--- /dev/null
+++ b/compat/strtod.c
@@ -0,0 +1,92 @@
+/*
+ * C99-compatible strtod() implementation
+ * 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
+ */
+
+#include <ctype.h>
+#include <limits.h>
+
+#include "libavutil/avstring.h"
+#include "libavutil/mathematics.h"
+#include "strtod.h"
+
+static char *check_nan_suffix(char *s)
+{
+    char *start = s;
+
+    if (*s++ != '(')
+        return start;
+
+    while ((*s >= 'a' && *s <= 'z') || (*s >= 'A' && *s <= 'Z') ||
+           (*s >= '0' && *s <= '9') ||  *s == '_')
+        s++;
+
+    return *s == ')' ? s + 1 : start;
+}
+
+#undef strtod
+double avpriv_strtod(char *restrict nptr, char **restrict endptr)
+{
+    char *end;
+    double res;
+
+    /* Skip leading spaces */
+    while (isspace(*nptr))
+        nptr++;
+
+    if (!av_strncasecmp(nptr, "infinity", 8)) {
+        end = nptr + 8;
+        res = INFINITY;
+    } else if (!av_strncasecmp(nptr, "inf", 3)) {
+        end = nptr + 3;
+        res = INFINITY;
+    } else if (!av_strncasecmp(nptr, "+infinity", 9)) {
+        end = nptr + 9;
+        res = INFINITY;
+    } else if (!av_strncasecmp(nptr, "+inf", 4)) {
+        end = nptr + 4;
+        res = INFINITY;
+    } else if (!av_strncasecmp(nptr, "-infinity", 9)) {
+        end = nptr + 9;
+        res = -INFINITY;
+    } else if (!av_strncasecmp(nptr, "-inf", 4)) {
+        end = nptr + 4;
+        res = -INFINITY;
+    } else if (!av_strncasecmp(nptr, "nan", 3)) {
+        end = check_nan_suffix(nptr + 3);
+        res = NAN;
+    } else if (!av_strncasecmp(nptr, "+nan", 4) ||
+               !av_strncasecmp(nptr, "-nan", 4)) {
+        end = check_nan_suffix(nptr + 4);
+        res = NAN;
+    } else if (!av_strncasecmp(nptr, "0x", 2) ||
+               !av_strncasecmp(nptr, "-0x", 3) ||
+               !av_strncasecmp(nptr, "+0x", 3)) {
+        /* FIXME this doesn't handle exponents, non-integers (float/double)
+         * and numbers too large for long long */
+        res = strtoll(nptr, &end, 16);
+    } else {
+        res = strtod(nptr, &end);
+    }
+
+    if (endptr)
+        *endptr = end;
+
+    return res;
+}
diff --git a/compat/strtod.h b/compat/strtod.h
new file mode 100644
index 0000000000..985bf4d16c
--- /dev/null
+++ b/compat/strtod.h
@@ -0,0 +1,37 @@
+/*
+ * C99-compatible strtod() implementation
+ * 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_STRTOD_H
+#define AVCOMPAT_STRTOD_H
+
+#include <stdlib.h>
+
+/*
+ * strtod() on MSVCRT doesn't handle strings like 'inf' or 'nan'. Also,
+ * it doesn't handle "0x" prefixes for hexadecimal input.
+ *
+ * Thus, provide our own fallback wrapper with correct behaviour.
+ */
+#undef strtod
+#define strtod avpriv_strtod
+double strtod(char *restrict nptr, char **restrict endptr);
+
+#endif /* AVCOMPAT_STRTOD_H */