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/read.c | 53 ++++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 50 insertions(+), 3 deletions(-)

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

diff --git a/src/base/io/read.c b/src/base/io/read.c
index b0ed3d2..d4f7bd9 100644
--- a/src/base/io/read.c
+++ b/src/base/io/read.c
@@ -1,7 +1,54 @@
 #include "internal.h"
 
-int
-io·read(io·Stream *s, int sz, int n, void *buf)
+intptr
+io·read(io·Header *io, intptr len, void *buf)
 {
-    return fread(buf, sz, n, s);
+    uchar *b;
+    intptr c0, c, nr, n, ic;
+
+    b = buf;
+    c = len;
+    ic = io->ilen; // how many bytes we've read and not flushed
+
+    while(c > 0){
+        n = -ic;
+        if(n > c)
+            n = c;
+        if(n == 0){
+            /* only continue if we are a file reader */
+            if(io->state != io·BufRdr)
+                break;
+
+            /* get more bytes */
+            if(sys·read(io->fd, io->cap, io->b, &nr)){
+                io->state = io·BufNil;
+                break;
+            }
+
+            if(nr == 0){
+                io->state = io·BufEnd;
+                break;
+            }
+
+            /* shift bytes within buffer so they end at terminal */
+            io->g = io->b;
+            io->pos += nr;
+            if(nr < io->cap){
+                io->g = io->e-nr;
+                mem·move(io->g, io->b, nr);
+            }
+            ic -= nr;
+            continue;
+        }
+        /* move our read bytes into the caller's buffer */
+        mem·move(b, io->e+ic, n);
+        c  -= n;
+        ic += n;
+        b  += n;
+    }
+    io->ilen = ic;
+    if(c == len && io->state == io·BufNil)
+        return -1;
+
+    return len-c;
 }
-- 
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