text: /* strncpy( char *, const char *, size_t )
  
     This file is part of the Public Domain C Library (PDCLib).
     Permission is granted to use, modify, and / or redistribute at will.
  */
  
  #include <string.h>
  
  #ifndef REGTEST
  
  char * strncpy( char * _PDCLIB_restrict s1, const char * _PDCLIB_restrict s2, size_t n )
  {
      char * rc = s1;
      while ( n && ( *s1++ = *s2++ ) )
      {
          /* Cannot do "n--" in the conditional as size_t is unsigned and we have
             to check it again for >0 in the next loop below, so we must not risk
             underflow.
          */
          --n;
      }
      /* Checking against 1 as we missed the last --n in the loop above. */
      while ( n-- > 1 )
      {
          *s1++ = '\0';
      }
      return rc;
  }
  
  #endif
  
  #ifdef TEST
  
  #include "_PDCLIB_test.h"
  
  int main( void )
  {
      char s[] = "xxxxxxx";
      TESTCASE( strncpy( s, "", 1 ) == s );
      TESTCASE( s[0] == '\0' );
      TESTCASE( s[1] == 'x' );
      TESTCASE( strncpy( s, abcde, 6 ) == s );
      TESTCASE( s[0] == 'a' );
      TESTCASE( s[4] == 'e' );
      TESTCASE( s[5] == '\0' );
      TESTCASE( s[6] == 'x' );
      TESTCASE( strncpy( s, abcde, 7 ) == s );
      TESTCASE( s[6] == '\0' );
      TESTCASE( strncpy( s, "xxxx", 3 ) == s );
      TESTCASE( s[0] == 'x' );
      TESTCASE( s[2] == 'x' );
      TESTCASE( s[3] == 'd' );
      return TEST_RESULTS;
  }
  
  #endif
  