Reimplemented bzero, bcopy and memset again. The previous ones had

subtle errors which crashed things.

libnix/sources/nix/misc/bcopy.c

@@ -1,9 +1,12 @@
 #include <stdlib.h>
 #include <string.h>
 
-/* This is a _fast_ block move routine! */
-
 void bcopy(const void *s1,void *s2,size_t n)
 {
-    memcpy(s2, s1, n);
+    unsigned char *ch1 = s1;
+    unsigned char *ch2 = s2;
+    while (n > 0) {
+	*ch2++ = *ch1++;
+	n--;
+    }
 }

libnix/sources/nix/misc/bzero.c

@@ -2,5 +2,9 @@
 
 void bzero(void *b,size_t n)
 {
-    memset(b, 0, n);
+    unsigned char *ch = (unsigned char *)b;
+    while (n > 0) {
+	*ch++ = 0;
+	n--;
+    }
 }

libnix/sources/nix/string/memset.c

@@ -2,22 +2,10 @@
 
 void *memset(void *s,int c,size_t n)
 { 
-    unsigned long *p = (unsigned long *)s;
-    unsigned char chr = (unsigned char)c;
-    unsigned long lc = (chr << 24) | (chr << 16) | (chr << 8) | chr;
-    unsigned char *ch;
-    size_t i;
-    size_t num = n / 4;
-    size_t remain = n % 4;
-
-    /* Do LONG operations most of the time to optimize memory bandwidth */
-    for (i = 0; i < num; i++) {
-	*p++ = lc;
-    }
-
-    ch = (unsigned char *)p;
-    for (i = 0; i < remain; i++) {
-	*ch++ = chr;
+    unsigned char *ch = (unsigned char *)s;
+    while (n > 0) {
+	*ch++ = c;
+	n--;
     }
     return s;
 }