From c5c7eeae1ea12588d324a8428b4c621f05478cca Mon Sep 17 00:00:00 2001
From: Kamila Szewczyk <kspalaiologos@gmail.com>
Date: Sun, 8 Oct 2023 14:52:17 +0200
Subject: [PATCH] wip stuff

---
 lib83/__assert_fail.c |  3 +--
 lib83/gotoxy.c        |  5 ++---
 lib83/memcpy.c        |  9 +++++++++
 lib83/memmove.c       | 24 ++++++++++++++++++++++++
 lib83/put_int.c       |  4 +---
 lib83/puts.c          |  3 +--
 lib83/string.h        | 11 +++++++++++
 7 files changed, 49 insertions(+), 10 deletions(-)
 create mode 100644 lib83/memcpy.c
 create mode 100644 lib83/memmove.c

diff --git a/lib83/__assert_fail.c b/lib83/__assert_fail.c
index 7aca21e..2cdf7b1 100644
--- a/lib83/__assert_fail.c
+++ b/lib83/__assert_fail.c
@@ -3,7 +3,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 
-void __assert_fail(const char *__assertion, const char *__file, unsigned int __line, const char *__function) {
+void __assert_fail(const char * __assertion, const char * __file, unsigned int __line, const char * __function) {
     clrscr();
     gotoxy(0, 0);
     puts("Assertion failed");
@@ -22,4 +22,3 @@ void __assert_fail(const char *__assertion, const char *__file, unsigned int __l
     getchar();
     exit();
 }
-
diff --git a/lib83/gotoxy.c b/lib83/gotoxy.c
index 10cf1aa..463ef91 100644
--- a/lib83/gotoxy.c
+++ b/lib83/gotoxy.c
@@ -1,11 +1,10 @@
 
 #include <stdio.h>
 
-__at (0x844B) unsigned char curRow;
-__at (0x844C) unsigned char curCol;
+__at(0x844B) unsigned char curRow;
+__at(0x844C) unsigned char curCol;
 
 void gotoxy(int x, int y) {
     curRow = y;
     curCol = x;
 }
-
diff --git a/lib83/memcpy.c b/lib83/memcpy.c
new file mode 100644
index 0000000..cc615f6
--- /dev/null
+++ b/lib83/memcpy.c
@@ -0,0 +1,9 @@
+
+#include <string.h>
+
+void * memcpy(void * dest, const void * src, size_t n) {
+    char * d = dest;
+    const char * s = src;
+    while (n--) *d++ = *s++;
+    return dest;
+}
diff --git a/lib83/memmove.c b/lib83/memmove.c
new file mode 100644
index 0000000..1299fd9
--- /dev/null
+++ b/lib83/memmove.c
@@ -0,0 +1,24 @@
+
+#include <string.h>
+
+void * memmove(void * dst, void * src, size_t acount) {
+    void * ret = dst;
+    char * d;
+    char * s;
+
+    if (((int)src < (int)dst) && ((((int)src) + acount) > (int)dst)) {
+        d = ((char *)dst) + acount - 1;
+        s = ((char *)src) + acount - 1;
+        while (acount--) {
+            *d-- = *s--;
+        }
+    } else {
+        d = dst;
+        s = src;
+        while (acount--) {
+            *d++ = *s++;
+        }
+    }
+
+    return (ret);
+}
diff --git a/lib83/put_int.c b/lib83/put_int.c
index b68f250..3881ef7 100644
--- a/lib83/put_int.c
+++ b/lib83/put_int.c
@@ -12,7 +12,5 @@ void put_int(int i) {
         buf[j++] = i % 10 + '0';
         i /= 10;
     } while (i > 0);
-    while (j > 0)
-        putchar(buf[--j]);
+    while (j > 0) putchar(buf[--j]);
 }
-
diff --git a/lib83/puts.c b/lib83/puts.c
index 4eee60f..17ae520 100644
--- a/lib83/puts.c
+++ b/lib83/puts.c
@@ -2,9 +2,8 @@
 #include <stdio.h>
 
 void puts(const char * s) {
-    while(*s) {
+    while (*s) {
         putchar(*s);
         s++;
     }
 }
-
diff --git a/lib83/string.h b/lib83/string.h
index 962b5af..c14c339 100644
--- a/lib83/string.h
+++ b/lib83/string.h
@@ -2,7 +2,18 @@
 #ifndef _STRING_H
 #define _STRING_H
 
+#include <stddef.h>
 
+extern void *memcpy(void *dest, const void *src, size_t n);
+extern void *memset(void *s, int c, size_t n);
+extern void *memmove(void *dest, const void *src, size_t n);
+extern int memcmp(const void *s1, const void *s2, size_t n);
+
+extern char *strcpy(char *dest, const char *src);
+extern char *strncpy(char *dest, const char *src, size_t n);
+extern size_t strlen(const char *s);
+extern int strcmp(const char *s1, const char *s2);
+extern int strncmp(const char *s1, const char *s2, size_t n);
 
 #endif