[project @ 1998-04-10 11:33:12 by simonm]

[ghc-hetmet.git] / ghc / lib / std / cbits / fileSize.lc

diff --git a/ghc/lib/std/cbits/fileSize.lc b/ghc/lib/std/cbits/fileSize.lc
new file mode 100644 (file)
index 0000000..34348fe
--- /dev/null
+++ b/ghc/lib/std/cbits/fileSize.lc
@@ -0,0 +1,45 @@
+%
+% (c) The GRASP/AQUA Project, Glasgow University, 1994
+%
+\subsection[fileSize.lc]{hfileSize Runtime Support}
+
+\begin{code}
+
+#include "rtsdefs.h"
+#include "stgio.h"
+
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+
+#ifdef HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif
+  
+StgInt
+fileSize(fp, result)
+StgForeignObj fp;
+StgByteArray result;
+{
+    struct stat sb;
+
+    while (fstat(fileno((FILE *) fp), &sb) < 0) {
+       /* highly unlikely */
+       if (errno != EINTR) {
+           cvtErrno();
+           stdErrno();
+           return -1;
+       }
+    }
+    if (S_ISREG(sb.st_mode)) {
+       /* result will be word aligned */
+       *(off_t *) result = sb.st_size;
+       return 0;
+    } else {
+       ghc_errtype = ERR_INAPPROPRIATETYPE;
+       ghc_errstr = "not a regular file";
+       return -1;
+    }
+}
+
+\end{code}