Move av_tempfile() into libavutil, it is a generically usefull thing and its small.

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

2 files changed, 40 insertions, 0 deletions

diff --git a/libavutil/file.c b/libavutil/file.c
index 31a3b7564f..4d14292ba1 100644
--- a/libavutil/file.c
+++ b/libavutil/file.c
@@ -130,6 +130,37 @@ void av_file_unmap(uint8_t *bufptr, size_t size)
 #endif
 }
 
+int av_tempfile(const char *prefix, char **filename) {
+    int fd=-1;
+#if !HAVE_MKSTEMP
+    *filename = tempnam(".", prefix);
+#else
+    size_t len = strlen(prefix) + 12; /* room for "/tmp/" and "XXXXXX\0" */
+    *filename = av_malloc(len);
+#endif
+    /* -----common section-----*/
+    if (*filename == NULL) {
+        av_log(NULL, AV_LOG_ERROR, "ff_tempfile: Cannot allocate file name\n");
+        return -1;
+    }
+#if !HAVE_MKSTEMP
+    fd = open(*filename, O_RDWR | O_BINARY | O_CREAT, 0444);
+#else
+    snprintf(*filename, len, "/tmp/%sXXXXXX", prefix);
+    fd = mkstemp(*filename);
+    if (fd < 0) {
+        snprintf(*filename, len, "./%sXXXXXX", prefix);
+        fd = mkstemp(*filename);
+    }
+#endif
+    /* -----common section-----*/
+    if (fd < 0) {
+        av_log(NULL, AV_LOG_ERROR, "ff_tempfile: Cannot open temporary file %s\n", *filename);
+        return -1;
+    }
+    return fd; /* success */
+}
+
 #ifdef TEST
 
 #undef printf
diff --git a/libavutil/file.h b/libavutil/file.h
index f28627c9d8..c6d2692d52 100644
--- a/libavutil/file.h
+++ b/libavutil/file.h
@@ -49,4 +49,13 @@ int av_file_map(const char *filename, uint8_t **bufptr, size_t *size,
  */
 void av_file_unmap(uint8_t *bufptr, size_t size);
 
+/**
+ * Wrapper to work around the lack of mkstemp() on mingw.
+ * Also, tries to create file in /tmp first, if possible.
+ * *prefix can be a character constant; *filename will be allocated internally.
+ * @return file descriptor of opened file (or -1 on error)
+ * and opened file name in **filename.
+ */
+int av_tempfile(const char *prefix, char **filename);
+
 #endif /* AVUTIL_FILE_H */