Cleaning code and provide minimal libc

6 files changed, 90 insertions, 0 deletions

diff --git a/src/libc/math.c b/src/libc/math.c
new file mode 100644
index 0000000..2051dc1
--- /dev/null
+++ b/src/libc/math.c
@@ -0,0 +1,14 @@
+#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;
+}
\ No newline at end of file
diff --git a/src/libc/math.h b/src/libc/math.h
new file mode 100644
index 0000000..56f1788
--- /dev/null
+++ b/src/libc/math.h
@@ -0,0 +1,6 @@
+#ifndef MATH_H
+#define MATH_H
+
+int pow(int x,int n);
+
+#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..ece8df5
--- /dev/null
+++ b/src/libc/stdio.h
@@ -0,0 +1,10 @@
+#ifndef STDIO_H
+#define STDIO_H
+
+#include "utils/framebuffer.h"
+
+void print(char*);
+void printc(char*,VIDEO_COLORS c);
+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..82106b2
--- /dev/null
+++ b/src/libc/string.h
@@ -0,0 +1,6 @@
+#ifndef STRING_H
+#define STRING_H
+
+void itoa(int i, char *a);
+
+#endif
\ No newline at end of file