rewrite the device subsystem interfaces (#48)

[lunaix-os.git] / lunaix-os / libs / klibc / string / strcpy.c

diff --git a/lunaix-os/libs/klibc/string/strcpy.c b/lunaix-os/libs/klibc/string/strcpy.c
index 88b5cb1ca2a02ab298e6f8b8a0532e59bcd0b454..7a3b430faad8a4cc673073ee752b7de6f099691c 100644 (file)
--- a/lunaix-os/libs/klibc/string/strcpy.c
+++ b/lunaix-os/libs/klibc/string/strcpy.c
@@ -1,6 +1,7 @@
 #include <klibc/string.h>
 #include <klibc/string.h>

+#include <lunaix/compiler.h>

 
 

-char*
+char* _weak

 strcpy(char* dest, const char* src)
 {
     char c;
 strcpy(char* dest, const char* src)
 {
     char c;


@@ -9,18 +10,35 @@ strcpy(char* dest, const char* src)
         dest[i] = c;
         i++;
     }
         dest[i] = c;
         i++;
     }

-    dest[i] = '\0';
-    return dest;
+    dest[i++] = '\0';
+    return &dest[i];

 }
 
 }
 

-char*
+/**
+ * @brief strcpy with constrain on numbers of character.
+ *        this version is smarter than stdc, it will automatically
+ *        handle the null-terminator.
+ * 
+ * @param dest 
+ * @param src 
+ * @param n 
+ * @return char* 
+ */
+char* _weak

 strncpy(char* dest, const char* src, unsigned long n)
 {
     char c;
     unsigned int i = 0;
 strncpy(char* dest, const char* src, unsigned long n)
 {
     char c;
     unsigned int i = 0;

-    while ((c = src[i]) && i <= n)
+    while (i <= n && (c = src[i]))

         dest[i++] = c;
         dest[i++] = c;

-    while (i <= n)
-        dest[i++] = 0;
+
+    if (!(n < i && src[i - 1])) {
+        while (i <= n)
+            dest[i++] = 0;
+    }
+    else {
+        dest[i - 1] = 0;
+    }
+    

     return dest;
 }
\ No newline at end of file
     return dest;
 }
\ No newline at end of file