Update libc implementation

libc/src/Makefile

@@ -19,6 +19,7 @@ ASM_SOURCES = $(shell find ./ -type f -name '*.asm')
 OBJ = ${C_SOURCES:.c=.o} ${CPP_SOURCES:.cpp=.o} ${ASM_SOURCES:.asm=.o} ${S_SOURCES:.S=.o}
 
 INCLUDE = ../include
+INCLUDE2 = ../../out/system/include
 
 ifeq ($(OSARCH), amd64)
 ASM_ARCH := elf64
@@ -26,7 +27,7 @@ else ifeq ($(OSARCH), i386)
 ASM_ARCH := elf32
 endif
 
-CFLAGS := -fPIC -I$(INCLUDE)
+CFLAGS := -fPIC -I$(INCLUDE) -I$(INCLUDE2)
 
 build: $(OBJECT_NAME)
 

libc/src/std/ctype.c

@@ -0,0 +1,27 @@
+#include <ctype.h>
+
+int tolower(int c)
+{
+    if (c >= 'A' && c <= 'Z')
+    {
+        c -= 'A';
+        c += 'a';
+    }
+
+    return c;
+}
+
+int toupper(int c)
+{
+    if (c >= 'a' && c <= 'z')
+    {
+        c -= 'a';
+        c += 'A';
+    }
+    return c;
+}
+
+int isspace(int c)
+{
+    return c == ' ' || c == '\t' || c == '\r' || c == '\n' || c == '\f' || c == '\v';
+}

libc/src/std/errno.c

@@ -0,0 +1,6 @@
+#include <errno.h>
+
+int *__errno_location(void)
+{
+    return 0;
+}

libc/src/std/io.c

@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <stdarg.h>
+#include <sys/syscalls.h>
 
 FILE *stdin;
 FILE *stdout;
@@ -54,17 +55,47 @@ void setbuf(FILE *stream, char *buf)
 {
 }
 
-// int vfprintf(FILE *stream, const char *format, va_list arg)
-// {
-//     return 0;
-// }
-
-int puts(const char *s)
+int vfprintf(FILE *stream, const char *format, va_list arg)
 {
     return 0;
 }
 
+int vsscanf(const char *s, const char *format, va_list arg)
+{
+}
+
+int sscanf(const char *s, const char *format, ...)
+{
+    va_list args;
+    va_start(args, format);
+    const int ret = vsscanf(s, format, args);
+    va_end(args);
+    return ret;
+}
+
+int fputc(int c, FILE *stream)
+{
+    syscall1(_Print, c);
+}
+
+int putc(int c, FILE *stream)
+{
+    syscall1(_Print, c);
+}
+
+int fputs(const char *s, FILE *stream)
+{
+    for (int i = 0; s[i] != '\0'; i++)
+        fputc(s[i], stream);
+}
+
 int putchar(int c)
 {
-    return 0;
+    syscall1(_Print, c);
+}
+
+int puts(const char *s)
+{
+    for (int i = 0; s[i] != '\0'; i++)
+        fputc(s[i], stdout);
 }

libc/src/std/lib.c

@@ -23,8 +23,7 @@ void exit(int status)
 
 int atoi(const char *nptr)
 {
-    // uint64_t Length = strlen((char *)nptr);
-    uint64_t Length = 0;
+    uint64_t Length = strlen((char *)nptr);
     if (nptr)
         while (nptr[Length] != '\0')
             ++Length;
@@ -62,3 +61,25 @@ void free(void *Address)
     PREFIX(free)
     (Address);
 }
+
+int system(const char *command)
+{
+    return 0;
+}
+
+double atof(const char *nptr)
+{
+    // FIXME: This is a very bad implementation of atof.
+    uint64_t Length = strlen((char *)nptr);
+    if (nptr)
+        while (nptr[Length] != '\0')
+            ++Length;
+    double OutBuffer = 0;
+    double Power = 1;
+    for (uint64_t i = Length; i > 0; --i)
+    {
+        OutBuffer += (nptr[i - 1] - 48) * Power;
+        Power *= 10;
+    }
+    return OutBuffer;
+}

libc/src/std/string.c

@@ -0,0 +1,142 @@
+#include <string.h>
+
+#include "../mem/liballoc_1_1.h"
+
+size_t strlen(const char *str)
+{
+    long unsigned i = 0;
+    if (str)
+        while (str[i] != '\0')
+            ++i;
+    return i;
+}
+
+int strcmp(const char *l, const char *r)
+{
+    for (; *l == *r && *l; l++, r++)
+        ;
+    return *(unsigned char *)l - *(unsigned char *)r;
+}
+
+int strncmp(const char *s1, const char *s2, size_t n)
+{
+    for (size_t i = 0; i < n; i++)
+    {
+        char c1 = s1[i], c2 = s2[i];
+        if (c1 != c2)
+            return c1 - c2;
+        if (!c1)
+            return 0;
+    }
+    return 0;
+}
+
+int strcasecmp(const char *s1, const char *s2)
+{
+    const unsigned char *p1 = (const unsigned char *)s1;
+    const unsigned char *p2 = (const unsigned char *)s2;
+    int result;
+    if (p1 == p2)
+        return 0;
+    while ((result = tolower(*p1) - tolower(*p2++)) == 0)
+        if (*p1++ == '\0')
+            break;
+    return result;
+}
+
+int strncasecmp(const char *string1, const char *string2, size_t count)
+{
+    if (count)
+    {
+        const unsigned char *s1 = (const unsigned char *)string1;
+        const unsigned char *s2 = (const unsigned char *)string2;
+        int result;
+        do
+        {
+            if ((result = tolower(*s1) - tolower(*s2++)) != 0 || !*s1++)
+                break;
+        } while (--count);
+        return result;
+    }
+    return 0;
+}
+
+char *strstr(const char *haystack, const char *needle)
+{
+    const char *a = haystack, *b = needle;
+    while (1)
+    {
+        if (!*b)
+            return (char *)haystack;
+        if (!*a)
+            return NULL;
+        if (*a++ != *b++)
+        {
+            a = ++haystack;
+            b = needle;
+        }
+    }
+}
+
+char *strncpy(char *destination, const char *source, unsigned long num)
+{
+    if (destination == NULL)
+        return NULL;
+    char *ptr = destination;
+    while (*source && num--)
+    {
+        *destination = *source;
+        destination++;
+        source++;
+    }
+    *destination = '\0';
+    return ptr;
+}
+
+char *strdup(const char *s)
+{
+    char *buf = (char *)__malloc(strlen((char *)s) + 1);
+    strncpy(buf, s, strlen(s) + 1);
+    return buf;
+}
+
+char *strchr(char const *s, int c)
+{
+    size_t len = strlen(s);
+    for (size_t i = 0; i < len; i++)
+        if (s[i] == c)
+            return (char *)s + i;
+
+    return NULL;
+}
+
+char *strrchr(char const *s, int c)
+{
+    size_t len = strlen(s);
+    size_t pos = len;
+
+    while (s[pos] != c && pos-- != 0)
+        ;
+
+    if (pos == len)
+        return NULL;
+
+    return (char *)s + pos;
+}
+
+void *memmove(void *dest, const void *src, size_t n)
+{
+    char *d = dest;
+    const char *s = src;
+    if (d < s)
+        while (n--)
+            *d++ = *s++;
+    else
+    {
+        const char *lasts = s + (n - 1);
+        char *lastd = d + (n - 1);
+        while (n--)
+            *lastd-- = *lasts--;
+    }
+    return dest;
+}

libc/src/std/sys_stat.c

@@ -0,0 +1,16 @@
+#include <sys/stat.h>
+
+int mkdir(const char *path, mode_t mode)
+{
+    return 0;
+}
+
+int remove(const char *pathname)
+{
+    return 0;
+}
+
+int rename(const char *oldpath, const char *newpath)
+{
+    return 0;
+}

libc/src/string.c

@@ -1,14 +0,0 @@
-#include <string.h>
-
-int strncmp(const char *s1, const char *s2, size_t n)
-{
-    for (size_t i = 0; i < n; i++)
-    {
-        char c1 = s1[i], c2 = s2[i];
-        if (c1 != c2)
-            return c1 - c2;
-        if (!c1)
-            return 0;
-    }
-    return 0;
-}