Parts of LIBC and few kernel fixes

scripts/build.py

@@ -26,11 +26,16 @@ def build():
     """ Build disk image with OS """
     cmds_to_run = []
 
-    cc_flags = "-std=c99 -nostdlib -c -O0 -Wall -Wextra -masm=intel -ggdb"
+    cc_flags = "-std=c99 -nostdlib -c -O0 -Wall -Wextra -masm=intel -ggdb -fstack-protector-strong"
     ld_flags = "-std=c99 -nostdlib -o kernel64 -O0 -Wall -Wextra -masm=intel -ggdb"
 
     objfiles = []
 
+    # LIBC files
+    for fname in glob("../src/os/crt/*.c"):
+        cmds_to_run.append("gcc %s %s" % (fname, cc_flags))
+        objfiles.append("%s.o" % os.path.basename(os.path.splitext(fname)[0]))
+
     for fname in glob("../src/os/*.c"):
         cmds_to_run.append("gcc %s %s" % (fname, cc_flags))
         objfiles.append("%s.o" % os.path.basename(os.path.splitext(fname)[0]))

src/os/common.h

@@ -1,4 +1,12 @@
 #pragma once
 #define UNUSED(a) (void)(a)
 
-typedef unsigned long long size_t;
+#ifdef __cplusplus
+#define STATIC_ASSERT(_Expression)      static_assert(_Expression, #_Expression)
+#else
+#if __STDC_VERSION__ == 201112L
+#define STATIC_ASSERT(_Expression)      _Static_assert(_Expression, #_Expression)
+#else
+#define STATIC_ASSERT(_Expression) typedef char __STATIC_ASSERT__[(_Expression) ? 1 : -1]
+#endif
+#endif

src/os/crt.h

@@ -1,5 +1,151 @@
 #pragma once
 #include "common.h"
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <limits.h>
 
-void *memset(void *dst, int c, size_t n);
-void *memmove(void *dst, const void *src, size_t n);
+// <ctype.h>
+
+#define CTYPE_NONE          0x0000
+#define CTYPE_ALPHA         0x0001
+#define CTYPE_BLANK         0x0002
+#define CTYPE_CNTRL         0x0004
+#define CTYPE_GRAPH         0x0008
+#define CTYPE_PUNCT         0x0010
+#define CTYPE_SPACE         0x0020
+#define CTYPE_LOWER         0x0040
+#define CTYPE_UPPER         0x0080
+#define CTYPE_DIGIT         0x0100
+#define CTYPE_XDIGIT        0x0200
+#define CTYPE_CBYTE         0x0400
+#define CTYPE_LEADBYTE      0x8000
+
+#define CT_UPPER            CTYPE_UPPER
+#define CT_LOWER            CTYPE_LOWER
+#define CT_DIGIT            CTYPE_DIGIT
+#define CT_SPACE            CTYPE_SPACE
+#define CT_PUNCT            CTYPE_PUNCT
+#define CT_CNTRL            CTYPE_CNTRL
+#define CT_BLANK            CTYPE_BLANK
+#define CT_XDIGIT           CTYPE_XDIGIT
+#define CT_GRAPH            CTYPE_GRAPH
+#define CT_LEADBYTE         CTYPE_LEADBYTE
+#define CT_CBYTE            CTYPE_CBYTE
+#define CT_ALPHA            (CTYPE_ALPHA | CTYPE_UPPER | CTYPE_LOWER)
+
+extern int isalnum(int c);
+extern int isalpha(int c);
+extern int isblank(int c);
+extern int iscntrl(int c);
+extern int isctype(int c, int desc);
+extern int isdigit(int c);
+extern int isgraph(int c);
+extern int islower(int c);
+extern int isprint(int c);
+extern int ispunct(int c);
+extern int isspace(int c);
+extern int isupper(int c);
+extern int isxdigit(int c);
+extern int tolower(int c);
+extern int toupper(int c);
+
+
+// <errno.h>
+
+typedef int errno_t;
+
+// Error Codes: 7.5 p.2, 7.5 p.4
+
+#define EPERM           1
+#define ENOENT          2
+#define ESRCH           3
+#define EINTR           4
+#define EIO             5
+#define ENXIO           6
+#define E2BIG           7
+#define ENOEXEC         8
+#define EBADF           9
+#define ECHILD          10
+#define EAGAIN          11
+#define ENOMEM          12
+#define EACCES          13
+#define EFAULT          14
+#define EBUSY           16
+#define EEXIST          17
+#define EXDEV           18
+#define ENODEV          19
+#define ENOTDIR         20
+#define EISDIR          21
+#define EINVAL          22
+#define ENFILE          23
+#define EMFILE          24
+#define ENOTTY          25
+#define EFBIG           27
+#define ENOSPC          28
+#define ESPIPE          29
+#define EROFS           30
+#define EMLINK          31
+#define EPIPE           32
+#define EDOM            33
+#define ERANGE          34
+#define EDEADLK         36
+#define ENAMETOOLONG    38
+#define ENOLCK          39
+#define ENOSYS          40
+#define ENOTEMPTY       41
+#define EILSEQ          42
+
+
+// <stdio.h>
+
+#define EOF             -1
+
+extern int snprintf(char *string, size_t size, const char *format, ...);
+extern int sprintf(char *string, const char *format, ...);
+extern int vsnprintf(char *string, size_t size, const char *format, va_list arglist);
+extern int vsprintf(char *string, const char *format, va_list arglist);
+extern int sscanf(const char* restrict str, const char* restrict format, ...);
+extern int vsscanf(const char* restrict str, const char* restrict format, va_list arglist);
+
+
+// <string.h>
+
+extern void* memchr(const void* ptr, int ch, size_t count);
+extern int memcmp(const void* lhs, const void* rhs, size_t count);
+extern void* memcpy(void *restrict dest, const void *restrict src, size_t count);
+extern void* memmove(void* dest, const void* src, size_t count);
+extern void* memset(void *dest, int ch, size_t count);
+extern char* strcat(char* restrict dest, const char* restrict src);
+extern char* strchr(const char* str, int ch);
+extern int strcmp(const char* lhs, const char* rhs);
+extern char* strcpy(char* restrict dest, const char* restrict src);
+extern size_t strcspn(const char* dest, const char* src);
+extern size_t strlen(const char* str);
+extern char* strncat(char* restrict dest, const char* restrict src, size_t count);
+extern int strncmp(const char* lhs, const char* rhs, size_t count);
+extern char* strncpy(char* restrict dest, const char* restrict src, size_t count);
+extern char* strpbrk(const char* dest, const char* breakset);
+extern char* strrchr(const char* str, int ch);
+extern size_t strspn(const char* dest, const char* src);
+extern char* strstr(const char* str, const char* substr);
+extern size_t strxfrm(char* restrict dest, const char* restrict src, size_t count);
+extern size_t strnlen_s(const char* str, size_t max_count);
+
+// <stdlib.h>
+
+extern int (abs)(int n);
+extern long int (labs)(long int n);
+extern long long int (llabs)(long long int n);
+
+extern long int (strtol)(const char* restrict str, char** restrict endstr, int base);
+extern long long int (strtoll)(const char* restrict str, char** restrict endstr, int base);
+extern unsigned long int (strtoul)(const char* restrict str, char** restrict endstr, int base);
+extern unsigned long long int (strtoull)(const char* restrict str, char** restrict endstr, int base);
+
+// Additional LIBC macros.
+#define __libc_flag_set(__Value, __Mask)                    ((__Value) | (__Mask))
+#define __libc_flag_unset(__Value, __Mask)                  ((__Value) & (~(__Mask)))
+#define __libc_flag_has(__Value, __Mask)                    (((__Value) & (__Mask)) == (__Mask))
+#define __libc_flag_any(__Value, __Mask)                    (((__Value) & (__Mask)) != 0)
+#define __libc_flag_none(__Value, __Mask)                   (((__Value) & (__Mask)) == 0)