reimplmenets the previous iteration with a brand new custom build system

libc/.gitignore

@@ -0,0 +1,3 @@
+*.a
+*.d
+*.o

libc/arch/README.md

@@ -0,0 +1,4 @@
+## What is this folder?
+
+This is where we place hosted libraries,
+when we inevitably add a proper libc (libk is freestanding)

libc/include/limits.h

@@ -0,0 +1,25 @@
+#ifndef LIMITS_H
+#define LIMITS_H
+
+#define CHAR_BIT 8
+#define SCHAR_MIN -128
+#define SCHAR_MAX 127
+#define UCHAR_MAX 255
+#define CHAR_MIN -128
+#define CHAR_MAX 127
+
+#define MB_LEN_MAX 16
+
+#define SHRT_MIN -32768
+#define SHRT_MAX 32767
+#define USHRT_MAX 65535
+
+#define INT_MIN -2147483648
+#define INT_MAX 2147483647
+#define UINT_MAX 4294967295
+
+#define LONG_MIN -9223372036854775808
+#define LONG_MAX 9223372036854775807
+#define ULONG_MAX 18446744073709551615
+
+#endif

libc/include/stdio.h

@@ -0,0 +1,20 @@
+#ifndef _STDIO_H
+#define _STDIO_H 1
+
+#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
+
+#endif

libc/include/stdlib.h

@@ -0,0 +1,17 @@
+#ifndef _STDLIB_H
+#define _STDLIB_H 1
+
+#include <sys/cdefs.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+__attribute__((__noreturn__))
+void abort(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

libc/include/string.h

@@ -0,0 +1,22 @@
+#ifndef _STRING_H
+#define _STRING_H 1
+
+#include <sys/cdefs.h>
+
+#include <stddef.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
+
+#endif

libc/include/sys/cdefs.h

@@ -0,0 +1,6 @@
+#ifndef _SYS_CDEFS_H
+#define _SYS_CDEFS_H 1
+
+#define __novaos_libc 1
+
+#endif

libc/stdio/printf.c

@@ -0,0 +1,80 @@
+#include <limits.h>
+#include <stdbool.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+
+static bool print(const char* data, size_t length) {
+	const unsigned char* bytes = (const unsigned char*) data;
+	for (size_t i = 0; i < length; i++)
+		if (putchar(bytes[i]) == EOF)
+			return false;
+	return true;
+}
+
+int printf(const char* restrict format, ...) {
+	va_list parameters;
+	va_start(parameters, format);
+
+	int written = 0;
+
+	while (*format != '\0') {
+		size_t maxrem = INT_MAX - written;
+
+		if (format[0] != '%' || format[1] == '%') {
+			if (format[0] == '%')
+				format++;
+			size_t amount = 1;
+			while (format[amount] && format[amount] != '%')
+				amount++;
+			if (maxrem < amount) {
+				// TODO: Set errno to EOVERFLOW.
+				return -1;
+			}
+			if (!print(format, amount))
+				return -1;
+			format += amount;
+			written += amount;
+			continue;
+		}
+
+		const char* format_begun_at = format++;
+
+		if (*format == 'c') {
+			format++;
+			char c = (char) va_arg(parameters, int /* char promotes to int */);
+			if (!maxrem) {
+				// TODO: Set errno to EOVERFLOW.
+				return -1;
+			}
+			if (!print(&c, sizeof(c)))
+				return -1;
+			written++;
+		} else if (*format == 's') {
+			format++;
+			const char* str = va_arg(parameters, const char*);
+			size_t len = strlen(str);
+			if (maxrem < len) {
+				// TODO: Set errno to EOVERFLOW.
+				return -1;
+			}
+			if (!print(str, len))
+				return -1;
+			written += len;
+		} else {
+			format = format_begun_at;
+			size_t len = strlen(format);
+			if (maxrem < len) {
+				// TODO: Set errno to EOVERFLOW.
+				return -1;
+			}
+			if (!print(format, len))
+				return -1;
+			written += len;
+			format += len;
+		}
+	}
+
+	va_end(parameters);
+	return written;
+}

libc/stdio/putchar.c

@@ -0,0 +1,15 @@
+#include <stdio.h>
+
+#if defined(__is_libk)
+#include <kernel/tty.h>
+#endif
+
+int putchar(int ic) {
+#if defined(__is_libk)
+	char c = (char) ic;
+	terminal_write(&c, sizeof(c));
+#else
+	// TODO: Implement stdio and the write system call.
+#endif
+	return ic;
+}

libc/stdio/puts.c

@@ -0,0 +1,5 @@
+#include <stdio.h>
+
+int puts(const char* string) {
+	return printf("%s\n", string);
+}

libc/stdlib/abort.c

@@ -0,0 +1,15 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+__attribute__((__noreturn__))
+void abort(void) {
+#if defined(__is_libk)
+	// TODO: Add proper kernel panic.
+	printf("kernel: panic: abort()\n");
+#else
+	// TODO: Abnormally terminate the process as if by SIGABRT.
+	printf("abort()\n");
+#endif
+	while (1) { }
+	__builtin_unreachable();
+}

libc/string/memcmp.c

@@ -0,0 +1,13 @@
+#include <string.h>
+
+int memcmp(const void* aptr, const void* bptr, size_t size) {
+	const unsigned char* a = (const unsigned char*) aptr;
+	const unsigned char* b = (const unsigned char*) bptr;
+	for (size_t i = 0; i < size; i++) {
+		if (a[i] < b[i])
+			return -1;
+		else if (b[i] < a[i])
+			return 1;
+	}
+	return 0;
+}

libc/string/memcpy.c

@@ -0,0 +1,9 @@
+#include <string.h>
+
+void* memcpy(void* restrict dstptr, const void* restrict srcptr, size_t size) {
+	unsigned char* dst = (unsigned char*) dstptr;
+	const unsigned char* src = (const unsigned char*) srcptr;
+	for (size_t i = 0; i < size; i++)
+		dst[i] = src[i];
+	return dstptr;
+}

libc/string/memmove.c

@@ -0,0 +1,14 @@
+#include <string.h>
+
+void* memmove(void* dstptr, const void* srcptr, size_t size) {
+	unsigned char* dst = (unsigned char*) dstptr;
+	const unsigned char* src = (const unsigned char*) srcptr;
+	if (dst < src) {
+		for (size_t i = 0; i < size; i++)
+			dst[i] = src[i];
+	} else {
+		for (size_t i = size; i != 0; i--)
+			dst[i-1] = src[i-1];
+	}
+	return dstptr;
+}

libc/string/memset.c

@@ -0,0 +1,8 @@
+#include <string.h>
+
+void* memset(void* bufptr, int value, size_t size) {
+	unsigned char* buf = (unsigned char*) bufptr;
+	for (size_t i = 0; i < size; i++)
+		buf[i] = (unsigned char) value;
+	return bufptr;
+}

libc/string/strlen.c

@@ -0,0 +1,8 @@
+#include <string.h>
+
+size_t strlen(const char* str) {
+	size_t len = 0;
+	while (str[len])
+		len++;
+	return len;
+}

libc/string/strlen.libk.c

@@ -0,0 +1,8 @@
+#include <string.h>
+
+size_t strlen(const char* str) {
+	size_t len = 0;
+	while (str[len])
+		len++;
+	return len;
+}