root/opal/util/string_copy.c

DEFINITIONS

1. opal_string_copy

   1 /*
   2  * Copyright (c) 2018 Cisco Systems, Inc.  All rights reserved.
   3  * $COPYRIGHT$
   4  *
   5  * Additional copyrights may follow
   6  *
   7  * $HEADER$
   8  */
   9 
  10 #include "opal_config.h"
  11 
  12 #include <assert.h>
  13 
  14 #include "opal/util/string_copy.h"
  15 
  16 
  17 void opal_string_copy(char *dest, const char *src, size_t dest_len)
  18 {
  19     size_t i;
  20     char *new_dest = dest;
  21 
  22     // Open MPI does not do *giant* string copies.  Hence, we use the
  23     // hueristic: if "dest_len" is too large, this is a programmer
  24     // error.  We pseudo-arbitrarily pick a large value to be the max
  25     // allowable dest_len: 128K.  If we ever need to increase this
  26     // value someday (because something has a legit reason to
  27     // opal_string_copy() more than 128K), the core dumps that are
  28     // generated by the assert() failure should make this fairly
  29     // obvious.
  30     assert(dest_len <= OPAL_MAX_SIZE_ALLOWED_BY_OPAL_STRING_COPY);
  31 
  32     for (i = 0; i < dest_len; ++i, ++src, ++new_dest) {
  33         *new_dest = *src;
  34         if ('\0' == *src) {
  35             return;
  36         }
  37     }
  38 
  39     dest[i - 1] = '\0';
  40 }