Refactoring

1 files changed, 71 insertions, 0 deletions

diff --git a/src/libs/string.cc b/src/libs/string.cc
new file mode 100644
index 0000000..f8ae3ca
--- /dev/null
+++ b/src/libs/string.cc
@@ -0,0 +1,71 @@
+#include "string.hpp"
+#include "math.hpp"
+
+void memcpy(void* src, void* dst, int size){
+    char *c_src=(char*)src;
+    char *c_dst=(char*)dst;
+    for(int i=0;i<size;i++)
+        *c_dst=*c_src;
+}
+
+void itoa(u64 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';
+}
+
+void itoh(u64 i, char *a){
+    char hex[]={'0','1','2','3','4','5','6','7','8','9',
+        'A','B','C','D','E','F'
+    };
+
+    // i should be split int two
+    // indeed shifting with more than 32 bits seems undefined 
+    u32 i_a=i&0xFFFFFFFF;
+    u32 i_b=i>>32;
+
+   for(char j=0;j<8;j++){
+        u64 t=(j*4);
+        u64 mask=0xF;
+        mask=mask <<  t;
+        u64 index=(i_a&mask) >> t;
+        a[15-j]=hex[index];
+    } 
+
+   for(char j=0;j<8;j++){
+        u64 t=(j*4);
+        u64 mask=0xF;
+        mask=mask <<  t;
+        u64 index=(i_b&mask) >> t;
+        a[15-(j+8)]=hex[index];
+    }
+    a[16]='\0';
+}
+
+int strlen(char *s){
+    int i=0;
+    while(s[i]!='\0')
+        i++;
+    return i;
+}
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