From ca1e725b0dc9b10997897dd2ac6d44028601d9bb Mon Sep 17 00:00:00 2001
From: Loic Guegan <manzerbredes@mailbox.org>
Date: Mon, 19 Apr 2021 19:06:28 +0200
Subject: Init sources

---
 src/libc/math.c   | 32 ++++++++++++++++++++++++++++++++
 src/libc/math.h   |  9 +++++++++
 src/libc/stdio.c  | 25 +++++++++++++++++++++++++
 src/libc/stdio.h  | 21 +++++++++++++++++++++
 src/libc/string.c | 29 +++++++++++++++++++++++++++++
 src/libc/string.h |  9 +++++++++
 6 files changed, 125 insertions(+)
 create mode 100644 src/libc/math.c
 create mode 100644 src/libc/math.h
 create mode 100644 src/libc/stdio.c
 create mode 100644 src/libc/stdio.h
 create mode 100644 src/libc/string.c
 create mode 100644 src/libc/string.h

(limited to 'src/libc')

diff --git a/src/libc/math.c b/src/libc/math.c
new file mode 100644
index 0000000..80b1d3a
--- /dev/null
+++ b/src/libc/math.c
@@ -0,0 +1,32 @@
+#include "math.h"
+
+int pow(int x,int n){
+    if(n<0)
+        return -1;
+    else if(n==0)
+        return 1;
+    else if(n==1)
+        return x;
+    int ret=x;
+    for(int i=0;i<(n-1);i++)
+        ret*=x;
+    return ret;
+}
+
+int max(int x,int y){
+    if(x>y)
+        return x;
+    return y;
+}
+
+int min(int x,int y){
+    if(x<y)
+        return x;
+    return y;
+}
+
+int abs(int x){
+    if(x<0)
+        return -x;
+    return x;
+}
\ No newline at end of file
diff --git a/src/libc/math.h b/src/libc/math.h
new file mode 100644
index 0000000..4cc37a9
--- /dev/null
+++ b/src/libc/math.h
@@ -0,0 +1,9 @@
+#ifndef MATH_H
+#define MATH_H
+
+int pow(int x,int n);
+int max(int x,int y);
+int min(int x,int y);
+int abs(int x);
+
+#endif
\ No newline at end of file
diff --git a/src/libc/stdio.c b/src/libc/stdio.c
new file mode 100644
index 0000000..6e0063b
--- /dev/null
+++ b/src/libc/stdio.c
@@ -0,0 +1,25 @@
+#include "stdio.h"
+#include "string.h"
+
+extern VIDEO_STATE VS;
+
+void print(char *str){
+  int i=0;
+  while(str[i]!='\0'){
+    putchar(str[i]);
+    i++;
+  }
+}
+
+void printc(char* str,VIDEO_COLORS c){
+  VIDEO_COLORS backup=VS.fg;
+  VS.fg=c;
+  print(str);
+  VS.fg=backup;
+}
+
+void printi(int i){
+    char str[12];
+    itoa(i,str);
+    print(str);
+}
\ No newline at end of file
diff --git a/src/libc/stdio.h b/src/libc/stdio.h
new file mode 100644
index 0000000..d4bd6b6
--- /dev/null
+++ b/src/libc/stdio.h
@@ -0,0 +1,21 @@
+#ifndef STDIO_H
+#define STDIO_H
+
+#include "drivers/framebuffer.h"
+
+/**
+ * Print a char* in the framebuffer
+ */
+void print(char*);
+
+/**
+ * Print a char in the framebuffer
+ */
+void printc(char*,VIDEO_COLORS c);
+
+/**
+ * Print an integer using itoa()
+ */
+void printi(int i);
+
+#endif
\ No newline at end of file
diff --git a/src/libc/string.c b/src/libc/string.c
new file mode 100644
index 0000000..93a9e63
--- /dev/null
+++ b/src/libc/string.c
@@ -0,0 +1,29 @@
+#include "string.h"
+#include "math.h"
+
+void itoa(int i, char *a){
+    // Check if lower than 0
+    char neg=0;
+    if(i<0){
+        neg=1;
+        i=-i;
+        a[0]='-';
+    }
+
+    // Count number of digits
+    int len=1;
+    while(i/pow(10,len)>=1)
+    {
+        len++;
+    }
+
+    // Build string
+    int max_pow=len-1;
+    for(int j=0;j<=max_pow;j++){
+        int cur_pow=pow(10,max_pow-j);
+        char digit=i/cur_pow;
+        a[j+neg]='0'+digit;
+        i=i-digit*cur_pow; // Remove first digits (most significant)
+    }
+    a[len+neg]='\0';
+}
\ No newline at end of file
diff --git a/src/libc/string.h b/src/libc/string.h
new file mode 100644
index 0000000..c3d3614
--- /dev/null
+++ b/src/libc/string.h
@@ -0,0 +1,9 @@
+#ifndef STRING_H
+#define STRING_H
+
+/**
+ * Convert int to char
+ */
+void itoa(int i, char *a);
+
+#endif
\ No newline at end of file
-- 
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