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

Signed-off-by: Martin Storsjö <martin@martin.st>
2012-09-04 14:30:37 +01:00
parent 0db2d94280
commit 4fa661a857
4 changed files with 167 additions and 0 deletions
--- a/compat/strtod.c
+++ b/compat/strtod.c
@@ -0,0 +1,94 @@
+/*
+ * C99-compatible strtod() implementation
+ * Copyright (c) 2012 Ronald S. Bultje <rsbultje@gmail.com>
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; 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 <stdlib.h>
+
+#include "libavutil/avstring.h"
+#include "libavutil/mathematics.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 strtod(const char *, char **);
+
+double avpriv_strtod(const char *nptr, char **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;
+}