avformat/utils: move mkdir_p to utils

Because it will be used by avformat/segment.c or other module which
need to automatically create sub-directories operation.

Signed-off-by: Steven Liu <lq@chinaffmpeg.org>

libavformat/utils.c

@@ -4797,6 +4797,40 @@ void av_url_split(char *proto, int proto_size,
     }
 }
 
+int ff_mkdir_p(const char *path)
+{
+    int ret = 0;
+    char *temp = av_strdup(path);
+    char *pos = temp;
+    char tmp_ch = '\0';
+
+    if (!path || !temp) {
+        return -1;
+    }
+
+    if (!av_strncasecmp(temp, "/", 1) || !av_strncasecmp(temp, "\\", 1)) {
+        pos++;
+    } else if (!av_strncasecmp(temp, "./", 2) || !av_strncasecmp(temp, ".\\", 2)) {
+        pos += 2;
+    }
+
+    for ( ; *pos != '\0'; ++pos) {
+        if (*pos == '/' || *pos == '\\') {
+            tmp_ch = *pos;
+            *pos = '\0';
+            ret = mkdir(temp, 0755);
+            *pos = tmp_ch;
+        }
+    }
+
+    if ((*(pos - 1) != '/') || (*(pos - 1) != '\\')) {
+        ret = mkdir(temp, 0755);
+    }
+
+    av_free(temp);
+    return ret;
+}
+
 char *ff_data_to_hex(char *buff, const uint8_t *src, int s, int lowercase)
 {
     int i;