update dependencies

add errmsg_info and msg

buffer/errmsg_writesys.c

@@ -0,0 +1,26 @@
+#include <stdarg.h>
+#include <sys/types.h>
+#include <sys/uio.h>
+#include "errmsg.h"
+#include "str.h"
+#include <string.h>
+#include <errno.h>
+
+extern int errmsg_cvt(struct iovec* x,const char* message, va_list a);
+
+void errmsg_writesys(int fd,const char* message,va_list list) {
+  struct iovec x[25];
+  int i;
+  i=errmsg_cvt(x,message,list);
+
+  x[i-1].iov_base=": ";
+  x[i-1].iov_len=2;
+
+  x[i].iov_base=strerror(errno);
+  x[i].iov_len=str_len(x[i].iov_base);
+
+  x[i+1].iov_base="\n";
+  x[i+1].iov_len=1;
+
+  writev(2,x,i+2);
+}