update userland to compile

1 files changed, 65 insertions, 0 deletions

diff --git a/user/lib/fread.c b/user/lib/fread.c
new file mode 100644
index 0000000..f8d0ad8
--- /dev/null
+++ b/user/lib/fread.c
@@ -0,0 +1,65 @@
+#include <stdio.h>
+#include <unistd.h>
+
+FILE *stdin = (void *)0;
+
+int getchar(void)
+{
+	return fgetc(stdin);
+}
+
+int getc(FILE *stream)
+{
+	return fgetc(stream);
+}
+
+int fgetc(FILE *stream)
+{
+	int c;
+	if (fread(&c, 1, 1, stream) < 1)
+		return EOF;
+	return c;
+}
+
+char *gets(char *str)
+{
+	char *s = str;
+	while (1) {
+		char c = fgetc(stdin);
+		if (c == '\n' || c == EOF || c == '\0')
+			break;
+		*(str++) = c;
+	}
+	*str = '\0';
+	return s;
+}
+
+char *fgets(char *restrict str, int size, FILE *stream)
+{
+	if (size < 1)
+		return NULL;
+
+	char *s = str;
+	while (size > 1) {
+		char c = fgetc(stream);
+		if (c == '\n' || c == EOF || c == '\0')
+			break;
+		*(str++) = c;
+		size--;
+	}
+
+	*str = '\0';
+	return s;
+}
+
+size_t fread(void *restrict ptr, size_t size, size_t n, FILE *restrict stream)
+{
+	int fd = (uintptr_t)stream;
+	char *restrict buf = ptr;
+
+	for (size_t i = 0; i < n; i++)
+		if (read(fd, buf + i * size, size) < 1)
+			return i;
+
+	return n;
+}