Fix asm2 compilation where __toread was used.

3 files changed, 19 insertions, 11 deletions

diff --git a/system/lib/libc/musl/readme.txt b/system/lib/libc/musl/readme.txt
index 7ad89449..02f3396a 100644
--- a/system/lib/libc/musl/readme.txt
+++ b/system/lib/libc/musl/readme.txt
@@ -10,4 +10,4 @@ Differences from upstream musl include:
 * Disable FLOCK, FUNLOCK and FFINALLOCK
 * Simplify fputwc to not rely on musl stream internals
 * signgam is no longer a weak alias of __signgam.
-
+* __toread and __towrite have had shutdown functionality removed.
diff --git a/system/lib/libc/musl/src/stdio/__toread.c b/system/lib/libc/musl/src/stdio/__toread.c
index 2e804f64..f00cc467 100644
--- a/system/lib/libc/musl/src/stdio/__toread.c
+++ b/system/lib/libc/musl/src/stdio/__toread.c
@@ -12,13 +12,3 @@ int __toread(FILE *f)
 	f->rpos = f->rend = f->buf;
 	return 0;
 }
-
-static const int dummy = 0;
-weak_alias(dummy, __towrite_used);
-
-void __stdio_exit(void);
-
-void __seek_on_exit()
-{
-	if (!__towrite_used) __stdio_exit();
-}
diff --git a/system/lib/libc/musl/src/stdio/__towrite.c b/system/lib/libc/musl/src/stdio/__towrite.c
new file mode 100644
index 00000000..3698d8b7
--- /dev/null
+++ b/system/lib/libc/musl/src/stdio/__towrite.c
@@ -0,0 +1,18 @@
+#include "stdio_impl.h"
+
+int __towrite(FILE *f)
+{
+	f->mode |= f->mode-1;
+	if (f->flags & (F_NOWR)) {
+		f->flags |= F_ERR;
+		return EOF;
+	}
+	/* Clear read buffer (easier than summoning nasal demons) */
+	f->rpos = f->rend = 0;
+
+	/* Activate write through the buffer. */
+	f->wpos = f->wbase = f->buf;
+	f->wend = f->buf + f->buf_size;
+
+	return 0;
+}