From 12e09f9f85ac48ff891adf92f3b2c9a5fea27273 Mon Sep 17 00:00:00 2001
From: Nicholas Noll <nbnoll@eml.cc>
Date: Sat, 4 Dec 2021 14:10:21 -0800
Subject: Chore(REMOVE): finished deprecation of old io functions.

The old methods were simple wrappers of C standard library functions.
We've moved (painfully) over to a new interface that allows for files to
live on the stack. All users of the functionality are ported over.
---
 src/base/io/getc.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 src/base/io/getc.c

(limited to 'src/base/io/getc.c')

diff --git a/src/base/io/getc.c b/src/base/io/getc.c
new file mode 100644
index 0000000..68e1772
--- /dev/null
+++ b/src/base/io/getc.c
@@ -0,0 +1,45 @@
+#include "internal.h"
+
+int
+io·getc(io·Header *io)
+{
+    int i;
+    intptr nr;
+
+loop:
+    i = io->ilen;
+    if(i != 0){
+        io->ilen = i+1;
+        return io->e[i];
+    }
+
+    if(io->state != io·BufRdr){
+        if(io->state == io·BufEnd)
+            io->state = io·BufRdr;
+        return io·BufEof;
+    }
+
+    /*
+     * get next buffer, try to keep io·BufUngets bytes
+     * pre-catenated from the previous read to allow for ungets 
+     */
+    mem·move(io->b-io·BufUngets, io->e-io·BufUngets, io·BufUngets);
+    if(sys·read(io->fd, io->cap, io->b, &nr)){
+        io->state = io·BufNil;
+        return io·BufEof;
+    }
+    if(nr == 0){
+        io->state = io·BufEnd;
+        return io·BufEof;
+    }
+
+    if(nr < io->cap){
+        mem·move(io->e-i-io·BufUngets, io->b-io·BufUngets, i+io·BufUngets);
+        io->g = io->e-i;
+    }
+
+    io->ilen = -i;
+    io->pos += +i;
+
+    goto loop;
+}
-- 
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