Initial commit. We have a booting kernel

libc/.gitignore

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+*.a
+*.d
+*.o

libc/Makefile

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+DEFAULT_HOST!=../default-host.sh
+HOST?=DEFAULT_HOST
+HOSTARCH!=../target-triplet-to-arch.sh $(HOST)
+ 
+CFLAGS?=-O2 -g
+CPPFLAGS?=
+LDFLAGS?=
+LIBS?=
+ 
+DESTDIR?=
+PREFIX?=/usr/local
+EXEC_PREFIX?=$(PREFIX)
+INCLUDEDIR?=$(PREFIX)/include
+LIBDIR?=$(EXEC_PREFIX)/lib
+ 
+CFLAGS:=$(CFLAGS) -ffreestanding -Wall -Wextra
+CPPFLAGS:=$(CPPFLAGS) -D__is_libc -Iinclude
+LIBK_CFLAGS:=$(CFLAGS)
+LIBK_CPPFLAGS:=$(CPPFLAGS) -D__is_libk
+ 
+ARCHDIR=arch/$(HOSTARCH)
+ 
+include $(ARCHDIR)/make.config
+ 
+CFLAGS:=$(CFLAGS) $(ARCH_CFLAGS)
+CPPFLAGS:=$(CPPFLAGS) $(ARCH_CPPFLAGS)
+LIBK_CFLAGS:=$(LIBK_CFLAGS) $(KERNEL_ARCH_CFLAGS)
+LIBK_CPPFLAGS:=$(LIBK_CPPFLAGS) $(KERNEL_ARCH_CPPFLAGS)
+ 
+FREEOBJS=\
+$(ARCH_FREEOBJS) \
+stdio/printf.o \
+stdio/putchar.o \
+stdio/puts.o \
+stdlib/abort.o \
+string/memcmp.o \
+string/memcpy.o \
+string/memmove.o \
+string/memset.o \
+string/strlen.o \
+ 
+HOSTEDOBJS=\
+$(ARCH_HOSTEDOBJS) \
+ 
+OBJS=\
+$(FREEOBJS) \
+$(HOSTEDOBJS) \
+ 
+LIBK_OBJS=$(FREEOBJS:.o=.libk.o)
+ 
+#BINARIES=libc.a libk.a # Not ready for libc yet.
+BINARIES=libk.a
+ 
+.PHONY: all clean install install-headers install-libs
+.SUFFIXES: .o .libk.o .c .S
+ 
+all: $(BINARIES)
+ 
+libc.a: $(OBJS)
+	$(AR) rcs $@ $(OBJS)
+ 
+libk.a: $(LIBK_OBJS)
+	$(AR) rcs $@ $(LIBK_OBJS)
+ 
+.c.o:
+	$(CC) -MD -c $< -o $@ -std=gnu11 $(CFLAGS) $(CPPFLAGS)
+ 
+.S.o:
+	$(CC) -MD -c $< -o $@ $(CFLAGS) $(CPPFLAGS)
+ 
+.c.libk.o:
+	$(CC) -MD -c $< -o $@ -std=gnu11 $(LIBK_CFLAGS) $(LIBK_CPPFLAGS)
+ 
+.S.libk.o:
+	$(CC) -MD -c $< -o $@ $(LIBK_CFLAGS) $(LIBK_CPPFLAGS)
+ 
+clean:
+	rm -f $(BINARIES) *.a
+	rm -f $(OBJS) $(LIBK_OBJS) *.o */*.o */*/*.o
+	rm -f $(OBJS:.o=.d) $(LIBK_OBJS:.o=.d) *.d */*.d */*/*.d
+ 
+install: install-headers install-libs
+ 
+install-headers:
+	mkdir -p $(DESTDIR)$(INCLUDEDIR)
+	cp -R --preserve=timestamps include/. $(DESTDIR)$(INCLUDEDIR)/.
+ 
+install-libs: $(BINARIES)
+	mkdir -p $(DESTDIR)$(LIBDIR)
+	cp $(BINARIES) $(DESTDIR)$(LIBDIR)
+ 
+-include $(OBJS:.o=.d)
+-include $(LIBK_OBJS:.o=.d)

libc/arch/i386/make.config

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+ARCH_CFLAGS=
+ARCH_CPPFLAGS=
+KERNEL_ARCH_CFLAGS=
+KERNEL_ARCH_CPPFLAGS=
+ 
+ARCH_FREEOBJS=\
+ 
+ARCH_HOSTEDOBJS=\

libc/include/stdio.h

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+#pragma once
+
+#include <sys/cdefs.h>
+
+#define EOF (-1)
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int printf(const char* __restrict, ...);
+int putchar(int);
+int puts(const char*);
+
+#ifdef __cplusplus
+}
+#endif

libc/include/stdlib.h

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+#pragma once
+
+#include <sys/cdefs.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+__attribute__((__noreturn__))
+void abort(void);
+
+#ifdef __cplusplus
+}
+#endif

libc/include/string.h

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+#pragma once
+
+#include <stddef.h>
+#include <sys/cdefs.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int memcmp(const void*, const void*, size_t);
+void* memcpy(void* __restrict, const void* __restrict, size_t);
+void* memmove(void*, const void*, size_t);
+void* memset(void*, int, size_t);
+size_t strlen(const char*);
+
+#ifdef __cplusplus
+}
+#endif

libc/include/sys/cdefs.h

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+#pragma once
+
+#define __banan_libc 1

libc/stdio/printf.c

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+#include <stdio.h>
+
+int printf(const char* restrict fmt, ...)
+{
+	int len = 0;
+	while (fmt[len])
+		putchar(fmt[len++]);
+	return len;
+}

libc/stdio/putchar.c

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+#include <stdio.h>
+
+#if defined(__is_libk)
+#include <kernel/tty.h>
+#endif
+
+int putchar(int c)
+{
+#if defined(__is_libk)
+	char ch = (char)c;
+	terminal_write(&ch, sizeof(ch));
+#else
+#endif
+	return c;
+}

libc/stdio/puts.c

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+#include <stdio.h>
+
+int puts(const char* str)
+{
+	return printf("%s\n", str);
+}

libc/stdlib/abort.c

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+#include <stdlib.h>
+#include <stdio.h>
+
+__attribute__((__noreturn__))
+void abort(void)
+{
+#if defined(__is_libk)
+	printf("Kernel panic: abort()\n");
+	asm volatile("hlt");
+#else
+	printf("abort()\n");
+#endif
+	while (1);
+	__builtin_unreachable();
+}

libc/string/memcmp.c

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+#include <string.h>
+
+int memcmp(const void* s1, const void* s2, size_t n)
+{
+	const unsigned char* a = s1;
+	const unsigned char* b = s2;
+
+	while (n--)
+	{
+		if (*a != *b)
+			return *a - *b;
+		a++;
+		b++;
+	}
+
+	return 0;
+}

libc/string/memcpy.c

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+#include <string.h>
+
+void* memcpy(void* restrict destp, const void* restrict srcp, size_t n)
+{
+	unsigned char* dest = (unsigned char*)destp;
+	const unsigned char* src = (const unsigned char*)srcp;
+	for (size_t i = 0; i < n; i++)
+		dest[i] = src[i];
+	return destp;
+}

libc/string/memmove.c

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+#include <string.h>
+
+void* memmove(void* destp, const void* srcp, size_t n)
+{
+	unsigned char* dest = (unsigned char*)destp;
+	const unsigned char* src = (const unsigned char*)srcp;
+
+	if (dest < src)
+	{
+		for (size_t i = 0; i < n; i++)
+			dest[i] = src[i];
+	}
+	else
+	{
+		for (size_t i = 1; i <= n; i++)
+			dest[n - i] = src[n - i];
+	}
+
+	return destp;
+}

libc/string/memset.c

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+#include <string.h>
+
+void* memset(void* s, int c, size_t n)
+{
+	unsigned char* p = (unsigned char*)s;
+	for (size_t i = 0; i < n; i++)
+		p[i] = c;
+	return s;
+}

libc/string/strlen.c

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+#include <string.h>
+
+size_t strlen(const char* str)
+{
+	size_t len = 0;
+	while (str[len])
+		len++;
+	return len;
+}