Add comments explaining changes to upstream source files.

[wasi-libc.git] / libc-top-half / musl / src / stdio / __stdout_write.c

diff --git a/libc-top-half/musl/src/stdio/__stdout_write.c b/libc-top-half/musl/src/stdio/__stdout_write.c
index f1aae3707cb32ebb1397b787084d5165b0788185..8190ec5b4c1fcb5c963ef06a96a2dfa37d89f3c3 100644 (file)
--- a/libc-top-half/musl/src/stdio/__stdout_write.c
+++ b/libc-top-half/musl/src/stdio/__stdout_write.c
@@ -1,17 +1,17 @@
 #include "stdio_impl.h"
 #include <sys/ioctl.h>
-#ifdef __wasilibc_unmodified_upstream
+#ifdef __wasilibc_unmodified_upstream // use isatty rather than manual ioctl
 #else
 #include <__function___isatty.h>
 #endif
 
 size_t __stdout_write(FILE *f, const unsigned char *buf, size_t len)
 {
-#ifdef __wasilibc_unmodified_upstream // isatty
+#ifdef __wasilibc_unmodified_upstream // use isatty rather than manual ioctl
        struct winsize wsz;
 #endif
        f->write = __stdio_write;
-#ifdef __wasilibc_unmodified_upstream // isatty
+#ifdef __wasilibc_unmodified_upstream // use isatty rather than manual ioctl
        if (!(f->flags & F_SVB) && __syscall(SYS_ioctl, f->fd, TIOCGWINSZ, &wsz))
 #else
        if (!(f->flags & F_SVB) && !__isatty(f->fd))