Avoid using void pointers in additive expressions.

PR:		56653

lib/libc/gen/opendir.c

@@ -97,7 +97,7 @@ __opendir2(name, flags)
 	    (dirp = malloc(sizeof(DIR) + sizeof(struct _telldir))) == NULL)
 		goto fail;
 
-	dirp->dd_td = (void *)dirp + sizeof(DIR);
+	dirp->dd_td = (struct _telldir *)((char *)dirp + sizeof(DIR));
 	LIST_INIT(&dirp->dd_td->td_locq);
 	dirp->dd_td->td_loccnt = 0;
 

lib/libc_r/uthread/uthread_write.c

@@ -78,7 +78,8 @@ _write(int fd, const void *buf, size_t nbytes)
 		 */
 		while (ret == 0) {
 			/* Perform a non-blocking write syscall: */
-			n = __sys_write(fd, buf + num, nbytes - num);
+			n = __sys_write(fd, (const char *)buf + num,
+			    nbytes - num);
 
 			/* Check if one or more bytes were written: */
 			if (n > 0)

lib/libc_r/uthread/uthread_writev.c

@@ -134,7 +134,9 @@ _writev(int fd, const struct iovec * iov, int iovcnt)
 						 * for the next write:
 						 */
 						p_iov[idx].iov_len -= cnt;
-						p_iov[idx].iov_base += cnt;
+						p_iov[idx].iov_base =
+						    (char *)p_iov[idx].iov_base
+						    + cnt;
 						cnt = 0;
 					}
 				}

sbin/ldconfig/ldconfig.c

@@ -578,8 +578,8 @@ readhints()
 	}
 	close(fd);
 
-	blist = (struct hints_bucket *)(addr + hdr->hh_hashtab);
-	strtab = (char *)(addr + hdr->hh_strtab);
+	blist = (struct hints_bucket *)((char *)addr + hdr->hh_hashtab);
+	strtab = (char *)addr + hdr->hh_strtab;
 
 	if (hdr->hh_version >= LD_HINTS_VERSION_2)
 		add_search_path(strtab + hdr->hh_dirlist);

sbin/ping/ping.c

@@ -947,7 +947,7 @@ pr_pack(buf, cc, from, tv)
 #else
 			tp = icp->icmp_data;
 #endif
-			tp += phdr_len;
+			tp = (const char *)tp + phdr_len;
 
 			if (cc - ICMP_MINLEN - phdr_len >= sizeof(tv1)) {
 				/* Copy to avoid alignment problems: */