From 0bca634f7e70b05239f46f3bd40bb37468d67957 Mon Sep 17 00:00:00 2001
From: Aleksa Vučković <aleksav013@gmail.com>
Date: Sun, 24 Oct 2021 18:47:28 +0200
Subject: Fixing keyboard, changes to Makefile and string.h, trying to add
 heap...

---
 src/string.c | 83 ++++++++++++++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 69 insertions(+), 14 deletions(-)

(limited to 'src/string.c')

diff --git a/src/string.c b/src/string.c
index f48614f..b0c42f2 100644
--- a/src/string.c
+++ b/src/string.c
@@ -1,12 +1,10 @@
-#include<stdbool.h>
-#include<stddef.h>
-#include<stdint.h>
+#include"types.h"
 
 size_t stringlen(char *str)
 {
     size_t i;
+
     for(i=0;str[i]!='\0';i++) ;
-    i--;
 
     return i;
 }
@@ -24,11 +22,17 @@ void stringcat(char *str1,char *str2)
     char *tmp=str1;
     while(*tmp) tmp++;
     while(*str2) *tmp++=*str2++;
+    *tmp=*str2;
+}
+
+void stringcpy(char *str1,char *str2)
+{
+    for(size_t i=0;str2[i]!='\0';i++) str1[i]=str2[i];
 }
 
 void stringrev(char *str)
 {
-    size_t i=stringlen(str);
+    size_t i=stringlen(str)-1;
 
     for(size_t j=0;j<i-j;j++)
     {
@@ -38,21 +42,72 @@ void stringrev(char *str)
     }
 }
 
-void itos(char *str,uint32_t num)
-{
-    size_t i;
-    for(i=0;num>0;num/=10,i++) str[i]='0'+num%10;
-    str[i]='\0';
-    stringrev(str);
-}
-
-uint32_t stoi(char *str)
+uint32_t stoi(const char *str)
 {
     uint32_t num=0;
+
     for(size_t i=0;str[i]!='\0';i++)
     {
+	if(str[i]<'0'||str[i]>'9') return num;
 	num*=10;
 	num+=str[i]-'0';
     }
+
     return num;
 }
+
+void itos(uint32_t num,char *str)
+{
+    if(num==0) stringcpy(str,"0");
+    else
+    {
+	size_t i=0;
+	for(;num>0;num/=10,i++) str[i]='0'+num%10;
+	str[i]='\0';
+
+	stringrev(str);
+    }
+}
+
+double stof(const char *str)
+{
+    double num=0;
+
+    bool point=0;
+    uint32_t pow=1;
+    size_t i=0;
+
+    for(;str[i]!='\0';i++)
+    {
+	if(str[i]=='.')
+	{
+	    if(point) return num/pow;
+	    point=1;
+	    continue;
+	}
+	if(str[i]<'0'||str[i]>'9') return num/pow;
+	num*=10;
+	num+=str[i]-'0';
+	if(point) pow*=10;
+    }
+
+    return num/pow;
+}
+
+const int decimals=7;
+void ftos(double num, char *str)
+{
+    itos((uint32_t)num,str);
+
+    stringcat(str,".");
+    char c[2];
+    c[1]='\0';
+
+    for(size_t i=0;i<decimals;i++)
+    {
+	num-=(uint32_t)num;
+	num*=10;
+	c[0]=(uint32_t)num+'0';
+	stringcat(str,c);
+    }
+}
-- 
cgit v1.2.3