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/* Implement string-related runtime actions for CHILL.
Copyright (C) 1992,1993 Free Software Foundation, Inc.
Author: Bill Cox
This file is part of GNU CC.
GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU CC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#define MIN(a, b) ((a) < (b) ? (a) : (b))
extern void cause_exception (char *exname, char *file, int lineno);
/*
* function __concatstring
*
* parameters:
* OUT - pointer to output string
* S1 - pointer to left string
* LEN1 - length of left string
* S2 - pointer to right string
* LEN2 - length of right string
*
* returns:
* pointer to OUT string
*
* exceptions:
* none
*
* abstract:
* concatenates two character strings into the output string
*
*/
char *
__concatstring (out, s1, len1, s2, len2)
char *out, *s1;
int len1;
char *s2;
int len2;
{
if (out)
{
if (s2 /* Check for overlap between s2 and out. */
&& ((s2 >= out && s2 < (out + len1 + len2))
|| (s2 + len2 > out && s2 <= out + len1)))
{
char *tmp = alloca (len2);
memcpy (tmp, s2, len2);
s2 = tmp;
}
if (s1)
memmove (out, s1, len1);
if (s2)
memcpy (&out[len1], s2, len2);
}
return out;
}
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