1 files changed, 47 insertions, 0 deletions
diff --git a/substdio.h b/substdio.h
new file mode 100644
index 0000000..c3f7f7d
--- /dev/null
+++ b/substdio.h
@@ -0,0 +1,47 @@
+#ifndef SUBSTDIO_H
+#define SUBSTDIO_H
+
+typedef struct substdio {
+  char *x;
+  int p;
+  int n;
+  int fd;
+  int (*op)();
+} substdio;
+
+#define SUBSTDIO_FDBUF(op,fd,buf,len) { (buf), 0, (len), (fd), (op) }
+
+extern void substdio_fdbuf();
+
+extern int substdio_flush();
+extern int substdio_put();
+extern int substdio_bput();
+extern int substdio_putflush();
+extern int substdio_puts();
+extern int substdio_bputs();
+extern int substdio_putsflush();
+
+extern int substdio_get();
+extern int substdio_bget();
+extern int substdio_feed();
+
+extern char *substdio_peek();
+extern void substdio_seek();
+
+#define substdio_fileno(s) ((s)->fd)
+
+#define SUBSTDIO_INSIZE 8192
+#define SUBSTDIO_OUTSIZE 8192
+
+#define substdio_PEEK(s) ( (s)->x + (s)->n )
+#define substdio_SEEK(s,len) ( ( (s)->p -= (len) ) , ( (s)->n += (len) ) )
+
+#define substdio_BPUTC(s,c) \
+  ( ((s)->n != (s)->p) \
+    ? ( (s)->x[(s)->p++] = (c), 0 ) \
+    : substdio_bput((s),&(c),1) \
+  )
+
+extern int substdio_copy();
+
+#endif