string: split and fix strcpy and strncpy (DONE)

CMakeLists.txt

@@ -143,6 +143,7 @@ set(SOURCES
   src/libc/string/strdup.c
   src/libc/string/strlen.c
   src/libc/string/strncmp.c
+  src/libc/string/strncpy.c
   src/libc/string/strnlen.c
   src/libc/string/strrchr.c)
 

src/libc/string/strcpy.c

@@ -1,41 +1,12 @@
 #include <string.h>
 
-/*
-** The  strcpy() function copies the string pointed to by src, including the
-** terminating null byte ('\0'), to the buffer pointed to by dest.
-** The strings may  not  overlap,  and  the  destination string dest must be
-** large enough to receive the copy. Beware of buffer overruns!
-**
-** TODO: use quad-word access and/or DMA !
-** TODO: look at the DSP ?
-*/
 char *strcpy(char *dest, char const *src)
 {
 	size_t i;
 
-	if (src == NULL || dest == NULL)
-		return (0);
 	i = -1;
 	while (src[++i] != '\0')
 		dest[i] = src[i];
 	dest[i] = '\0';
 	return (dest);
 }
-
-/*
-** The strncpy() function is similar, except that at most n bytes of src are
-** copied. Warning: If there is no null byte among the first n bytes of src, the
-** string placed  in  dest  will  not  be null-terminated.
-*/
-char *strncpy(char *dest, char const *str, size_t size)
-{
-	size_t i;
-
-	if (str == NULL || dest == NULL)
-		return (0);
-	i = -1;
-	while (++i < size && str[i] != '\0')
-		dest[i] = str[i];
-	dest[i] = '\0';
-	return (dest);
-}

src/libc/string/strncpy.c

@@ -0,0 +1,13 @@
+#include <string.h>
+
+char *strncpy(char *dest, char const *str, size_t size)
+{
+	size_t i;
+
+	for (i = 0; i < size && str[i]; i++)
+		dest[i] = str[i];
+	for(; i < size; i++)
+		dest[i] = 0;
+
+	return (dest);
+}