Integrate MySQL module.

module/Vendor/MDBC/libmariadb/strxnmov.c

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+/*  File   : strxnmov.c
+    Author : Richard A. O'Keefe.
+    Updated: 2 June 1984
+    Defines: strxnmov()
+
+    strxnmov(dst, len, src1, ..., srcn, NullS)
+    moves the first len characters of the concatenation of src1,...,srcn
+    to dst.  If there aren't that many characters, a NUL character will
+    be added to the end of dst to terminate it properly.  This gives the
+    same effect as calling strxcpy(buff, src1, ..., srcn, NullS) with a
+    large enough buffer, and then calling strnmov(dst, buff, len).
+    It is just like strnmov except that it concatenates multiple sources.
+    Beware: the last argument should be the null character pointer.
+    Take VERY great care not to omit it!  Also be careful to use NullS
+    and NOT to use 0, as on some machines 0 is not the same size as a
+    character pointer, or not the same bit pattern as NullS.
+
+    Note: strxnmov is like strnmov in that it moves up to len
+    characters; dst will be padded on the right with one NUL characters if
+    needed.
+*/
+
+#include <my_global.h>
+#include "m_string.h"
+#include <stdarg.h>
+
+char *strxnmov(char *dst, size_t len, const char *src, ...)
+{
+  va_list pvar;
+  char *end_of_dst=dst+len;
+
+  va_start(pvar,src);
+  while (src != NullS)
+  {
+    do
+    {
+      if (dst == end_of_dst)
+	goto end;
+    }
+    while ((*dst++ = *src++));
+    dst--;
+    src = va_arg(pvar, char *);
+  }
+  *dst=0;
+end:
+  va_end(pvar);
+  return dst;
+}