LibC: add stubs for a lot of functions

libc/include/stdio.h

@@ -1,13 +1,42 @@
 #pragma once
 
+#include <stddef.h>
+#include <stdarg.h>
 #include <sys/cdefs.h>
+#include <sys/types.h>
 
 #define EOF (-1)
 
+#define stdin stdin
+#define stdout stdout
+#define stderr stderr
+
+#define SEEK_CUR 0
+#define SEEK_END 1
+#define SEEK_SET 2
+
 __BEGIN_DECLS
 
-int printf(const char* __restrict, ...);
+struct FILE;
+typedef struct FILE FILE;
+
+extern FILE* stdin;
+extern FILE* stdout;
+extern FILE* stderr;
+
+FILE* fopen(const char* __restrict__, const char* __restrict__);
+int fclose(FILE*);
+int fflush(FILE*);
+int fprintf(FILE* __restrict__, const char* __restrict__, ...);
+int fseek(FILE*, long, int);
+int printf(const char* __restrict__, ...);
 int putchar(int);
 int puts(const char*);
+int vfprintf(FILE* __restrict__, const char* __restrict__, va_list);
+long ftell(FILE*);
+size_t fread(void* __restrict__, size_t, size_t, FILE*);
+size_t fwrite(void const* __restrict__, size_t, size_t, FILE*);
+void setbuf(FILE* __restrict__, char* __restrict__);
+int sprintf(char* __restrict__, const char* __restrict__, ...);
 
-__END_DECLS
+__END_DECLS

libc/include/stdlib.h

@@ -1,14 +1,21 @@
 #pragma once
 
-#include <sys/cdefs.h>
 #include <stddef.h>
+#include <sys/cdefs.h>
 
 __BEGIN_DECLS
 
-__attribute__((__noreturn__))
-void abort(void);
+[[noreturn]] void abort(void);
+
+int abs(int);
+
+int atexit(void(*)(void));
+int atoi(const char*);
+
+char* getenv(const char*);
 
 void* malloc(size_t);
+void* calloc(size_t, size_t);
 void free(void*);
 
 __END_DECLS

libc/include/string.h

@@ -6,7 +6,7 @@
 __BEGIN_DECLS
 
 int memcmp(const void*, const void*, size_t);
-void* memcpy(void* __restrict, const void* __restrict, 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*);
@@ -14,8 +14,12 @@ size_t strlen(const char*);
 int strcmp(const char*, const char*);
 int strncmp(const char*, const char*, size_t);
 
-char* strcpy(char* __restrict, const char* __restrict);
-char* strncpy(char* __restrict, const char* __restrict, size_t);
+char* strcpy(char* __restrict__, const char* __restrict__);
+char* strncpy(char* __restrict__, const char* __restrict__, size_t);
+
+char* strcat(char* __restrict__, const char* __restrict__);
+
+char* strchr(const char*, int);
 
 char* strstr(const char*, const char*);
 

libc/include/unistd.h

@@ -1,5 +1,21 @@
 #pragma once
 
+#include <sys/types.h>
+
 #define STDIN_FILENO 0
 #define STDOUT_FILENO 1
 #define STDERR_FILENO 2
+
+// fork(), execv(), execve(), execvp(), getpid()
+
+__BEGIN_DECLS
+
+pid_t fork(void);
+
+int execv(const char*, char* const[]);
+int execve(const char*, char* const[], char* const[]);
+int execvp(const char*, char* const[]);
+
+pid_t getpid(void);
+
+__END_DECLS

libc/stdio.cpp

@@ -0,0 +1,95 @@
+#include <stdarg.h>
+#include <stdio.h>
+#include <unistd.h>
+
+struct FILE
+{
+	int fd;
+};
+
+static FILE __stdin { .fd = STDIN_FILENO };
+static FILE __stdout { .fd = STDOUT_FILENO };
+static FILE __stderr { .fd = STDERR_FILENO };
+
+FILE* stdin = &__stdin;
+FILE* stdout = &__stdout;
+FILE* stderr = &__stderr;
+
+int fclose(FILE*)
+{
+	return -1;
+}
+
+int fflush(FILE*)
+{
+	return 0;
+}
+
+FILE* fopen(const char* __restrict__, const char* __restrict__)
+{
+	return nullptr;
+}
+
+int fseek(FILE*, long, int)
+{
+	return -1;
+}
+
+long ftell(FILE*)
+{
+	return -1;
+}
+
+size_t fread(void* __restrict__, size_t, size_t, FILE*)
+{
+	return 0;
+}
+
+size_t fwrite(void const* __restrict__, size_t, size_t, FILE*)
+{
+	return 0;
+}
+
+int fprintf(FILE* __restrict__ file, const char* __restrict__ format, ...)
+{
+	va_list args;
+	va_start(args, format);
+	int res = vfprintf(stdout, format, args);
+	va_end(args);
+	return res;
+}
+
+
+void setbuf(FILE* __restrict__, char* __restrict__)
+{
+
+}
+
+int vfprintf(FILE* __restrict__, const char* __restrict__, va_list)
+{
+	return -1;
+}
+
+int printf(const char* __restrict__ format, ...)
+{
+	va_list args;
+	va_start(args, format);
+	int res = vfprintf(stdout, format, args);
+	va_end(args);
+	return res;
+}
+
+int putchar(int ch)
+{
+	return printf("%c", ch);
+}
+
+int puts(const char* str)
+{
+	return printf("%s", str);
+}
+
+int sprintf(char* __restrict__ stream, const char* __restrict__ format, ...)
+{
+	return -1;
+}

libc/stdlib.cpp

@@ -0,0 +1,64 @@
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+
+void abort(void)
+{
+
+}
+
+int abs(int val)
+{
+	return val < 0 ? -val : val;
+}
+
+int atexit(void(*)(void))
+{
+	return -1;
+}
+
+int atoi(const char* str)
+{
+	while (isspace(*str))
+		str++;
+
+	bool negative = (*str == '-');
+
+	if (*str == '-' || *str == '+')
+		str++;
+
+	int res = 0;
+	while (isdigit(*str))
+	{
+		res = (res * 10) + (*str - '0');
+		str++;
+	}
+
+	return negative ? -res : res;
+}
+
+char* getenv(const char*)
+{
+	return nullptr;
+}
+
+void* malloc(size_t)
+{
+	return nullptr;	
+}
+
+void* calloc(size_t nmemb, size_t size)
+{
+	if (nmemb * size < nmemb)
+		return nullptr;
+	void* ptr = malloc(nmemb * size);
+	if (ptr == nullptr)
+		return nullptr;
+	memset(ptr, 0, nmemb * size);
+	return ptr;
+}
+
+void free(void*)
+{
+
+}

libc/stdlib/abort.cpp

@@ -1,18 +0,0 @@
-#include <stdlib.h>
-#include <stdio.h>
-
-#if defined(__is_libk)
-#include <kernel/Panic.h>
-#endif
-
-__attribute__((__noreturn__))
-void abort(void)
-{
-#if defined(__is_libk)
-	Kernel::panic("abort()");
-#else
-	printf("abort()\n");
-#endif
-	while (1);
-	__builtin_unreachable();
-}

libc/string.cpp

@@ -15,7 +15,7 @@ int memcmp(const void* s1, const void* s2, size_t n)
 	return 0;
 }
 
-void* memcpy(void* __restrict dstp, const void* __restrict srcp, size_t n)
+void* memcpy(void* __restrict__ dstp, const void* __restrict__ srcp, size_t n)
 {
 	unsigned char* dst = static_cast<unsigned char*>(dstp);
 	const unsigned char* src = static_cast<const unsigned char*>(srcp);
@@ -61,7 +61,7 @@ int strcmp(const char* s1, const char* s2)
 	return *u1 - *u2;
 }
 
-char* strcpy(char* __restrict dest, const char* __restrict src)
+char* strcpy(char* __restrict__ dest, const char* __restrict__ src)
 {
 	size_t i;
 	for (i = 0; src[i]; i++)
@@ -70,6 +70,12 @@ char* strcpy(char* __restrict dest, const char* __restrict src)
 	return dest;
 }
 
+char* strcat(char* __restrict__ dest, const char* __restrict__ src)
+{
+	strcpy(dest + strlen(src), src);
+	return dest;
+}
+
 char* strerror(int error)
 {
 	static char buffer[100];
@@ -147,7 +153,18 @@ int strncmp(const char* s1, const char* s2, size_t n)
 	return *u1 - *u2;
 }
 
-char* strncpy(char* __restrict dest, const char* __restrict src, size_t n)
+char* strchr(const char* str, int c)
+{
+	while (*str)
+	{
+		if (*str == c)
+			return (char*)str;
+		str++;
+	}
+	return (*str == c) ? (char*)str : nullptr;
+}
+
+char* strncpy(char* __restrict__ dest, const char* __restrict__ src, size_t n)
 {
 	size_t i;
 	for (i = 0; src[i] && i < n; i++)

libc/unistd.cpp

@@ -0,0 +1,26 @@
+#include <unistd.h>
+
+pid_t fork(void)
+{
+	return -1;
+}
+
+int execv(const char*, char* const[])
+{
+	return -1;
+}
+
+int execve(const char*, char* const[], char* const[])
+{
+	return -1;
+}
+
+int execvp(const char*, char* const[])
+{
+	return -1;
+}
+
+pid_t getpid(void)
+{
+	return -1;
+}