Basis for a shell.

3 files changed, 82 insertions, 1 deletions

diff --git a/src/lib/include/stdio.h b/src/lib/include/stdio.h
new file mode 100644
index 0000000..4b300da
--- /dev/null
+++ b/src/lib/include/stdio.h
@@ -0,0 +1,14 @@
+#pragma once
+
+#include <stddef.h>
+#include <stdarg.h>
+#include <stdint.h>
+
+void putchar(int c);
+void puts(char* s);
+void printf(char* arg, ...);
+
+int getchar();
+void getline(char* buf, size_t l);
+
+/* vim: set ts=4 sw=4 tw=0 noet :*/
diff --git a/src/lib/libkogata/Makefile b/src/lib/libkogata/Makefile
index a02a862..20c6dee 100644
--- a/src/lib/libkogata/Makefile
+++ b/src/lib/libkogata/Makefile
@@ -1,5 +1,6 @@
 OBJ = start.o malloc.o debug.o syscall.o user_region.o \
-	mainloop.o gip.o draw.o keyboard.o
+	mainloop.o gip.o draw.o keyboard.o \
+	stdio.o
 
 LIB = ../../common/libkogata/libkogata.lib ../../common/libalgo/libalgo.lib ../../common/libc/libc.lib
 
diff --git a/src/lib/libkogata/stdio.c b/src/lib/libkogata/stdio.c
new file mode 100644
index 0000000..1c298ad
--- /dev/null
+++ b/src/lib/libkogata/stdio.c
@@ -0,0 +1,66 @@
+#include <syscall.h>
+
+#include <printf.h>
+#include <stdio.h>
+
+
+fd_t stdio = 1;
+
+int getc() {
+	sel_fd_t fd;
+	fd.fd = stdio;
+	fd.req_flags = SEL_READ;
+	ASSERT(select(&fd, 1, -1));
+	ASSERT(fd.got_flags & SEL_READ);
+
+	char chr;
+	size_t sz = read(stdio, 0, 1, &chr);
+	ASSERT(sz == 1);
+	return chr;
+}
+
+
+void putc(int c) {
+	char chr = c;
+	write(stdio, 0, 1, &chr);
+}
+
+void puts(char* s) {
+	while (*s) putc(*(s++));
+}
+
+void getline(char* buf, size_t l) {
+	size_t i = 0;
+	while (true) {
+		int c = getc();
+		if (c == '\n') {
+			putc('\n');
+			buf[i] = 0;
+			break;
+		} else if (c == '\b') {
+			if (i > 0) {
+				 i--;
+				putc('\b');
+			}
+		} else if (c >= ' ') {
+			buf[i] = c;
+			if (i < l-1) {
+				i++;
+				putc(c);
+			}
+		}
+	}
+}
+
+void printf(char* fmt, ...) {
+	va_list ap;
+	char buffer[256];
+
+	va_start(ap, fmt);
+	vsnprintf(buffer, 256, fmt, ap);
+	va_end(ap);
+
+	puts(buffer);
+}
+
+/* vim: set ts=4 sw=4 tw=0 noet :*/