vlm: simplify and fix abnormal cases

Correctly reject non-regular files: previously, the code would get
stuck on FIFOs, and ignore other types silently.

Check that reading the file actually succeeds.

src/input/vlmshell.c

@@ -41,6 +41,9 @@
 #ifdef ENABLE_VLM
 
 #include <time.h>                                                 /* ctime() */
+#include <limits.h>
+#include <fcntl.h>
+#include <sys/stat.h>
 
 #include <vlc_input.h>
 #include "input_internal.h"
@@ -49,7 +52,6 @@
 #include <vlc_charset.h>
 #include <vlc_fs.h>
 #include <vlc_sout.h>
-#include <vlc_url.h>
 #include "../stream_output/stream_output.h"
 #include "../libvlc.h"
 
@@ -525,44 +527,31 @@ error:
 
 static int ExecuteLoad( vlm_t *p_vlm, const char *psz_path, vlm_message_t **pp_status )
 {
-    char *psz_url = vlc_path2uri( psz_path, NULL );
-    stream_t *p_stream = stream_UrlNew( p_vlm, psz_url );
-    free( psz_url );
-    uint64_t i_size;
-    char *psz_buffer;
-
-    if( !p_stream )
+    int fd = vlc_open( psz_path, O_RDONLY|O_NONBLOCK );
+    if( fd == -1 )
     {
         *pp_status = vlm_MessageNew( "load", "Unable to load from file" );
         return VLC_EGENERIC;
     }
 
-    /* FIXME needed ? */
-    if( stream_Seek( p_stream, 0 ) != 0 )
-    {
-        stream_Delete( p_stream );
-
-        *pp_status = vlm_MessageNew( "load", "Read file error" );
-        return VLC_EGENERIC;
-    }
-
-    i_size = stream_Size( p_stream );
-    if( i_size > SIZE_MAX - 1 )
-        i_size = SIZE_MAX - 1;
+    struct stat st;
+    char *psz_buffer = NULL;
 
-    psz_buffer = malloc( i_size + 1 );
-    if( !psz_buffer )
+    if( fstat( fd, &st ) || !S_ISREG( st.st_mode )
+     || st.st_size >= SSIZE_MAX
+     || ((psz_buffer = malloc( st.st_size + 1 )) == NULL)
+     || read( fd, psz_buffer, st.st_size ) < (ssize_t)st.st_size )
     {
-        stream_Delete( p_stream );
+        free( psz_buffer );
+        close( fd );
 
         *pp_status = vlm_MessageNew( "load", "Read file error" );
         return VLC_EGENERIC;
     }
 
-    stream_Read( p_stream, psz_buffer, i_size );
-    psz_buffer[i_size] = '\0';
+    close( fd );
 
-    stream_Delete( p_stream );
+    psz_buffer[st.st_size] = '\0';
 
     if( Load( p_vlm, psz_buffer ) )
     {