update userland to compile

1 files changed, 57 insertions, 0 deletions

diff --git a/user/lib/fwrite.c b/user/lib/fwrite.c
new file mode 100644
index 0000000..aa828e0
--- /dev/null
+++ b/user/lib/fwrite.c
@@ -0,0 +1,57 @@
+#include <stdio.h>
+#include <unistd.h>
+
+FILE *stdout = (void *)1;
+
+int putchar(int c)
+{
+	return putc(c, stdout);
+}
+
+int putc(int c, FILE *stream)
+{
+	return fputc(c, stream);
+}
+
+int fputc(int c, FILE *stream)
+{
+	if (fwrite(&c, 1, 1, stream) < 1)
+		return EOF;
+	return c;
+}
+
+int puts(const char *str)
+{
+	int res;
+	res = fputs(str, stdout);
+	if (res == EOF)
+		return res;
+	res = fputc('\n', stdout);
+	if (res == EOF)
+		return res;
+	return 0;
+}
+
+int fputs(const char *str, FILE *stream)
+{
+	int res;
+	while (*str) {
+		res = fputc(*str++, stream);
+		if (res == EOF)
+			return res;
+	}
+	return 0;
+}
+
+size_t fwrite(const void *restrict ptr, size_t size, size_t n,
+			  FILE *restrict stream)
+{
+	int fd = (uintptr_t)stream;
+	const char *restrict buf = ptr;
+
+	for (size_t i = 0; i < n; i++)
+		if (write(fd, buf + i * size, size) < 1)
+			return i;
+
+	return n;
+}