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64 lines
1.5 KiB
C
64 lines
1.5 KiB
C
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/* Implement string-related runtime actions for CHILL.
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Copyright (C) 1992,1993 Free Software Foundation, Inc.
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Author: Bill Cox
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#define MIN(a, b) ((a) < (b) ? (a) : (b))
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/*
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* function memmove
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*
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* parameters:
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* S1 - pointer to destination string
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* S2 - pointer to source string
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* LEN - length of string
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*
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* returns:
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* pointer to destination string
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*
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* exceptions:
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* none
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*
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* abstract:
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* copies a string safely, where the source and dest areas may overlap.
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*
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*/
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void *
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memmove (s1, s2, n)
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void *s1;
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const void *s2;
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int n;
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{
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char *sc1 = s1;
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const char *sc2 = s2;
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if (sc2 < sc1 && (sc1 < sc2 + n))
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for (sc1 += n, sc2 += n; 0 < n; --n)
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*--sc1 = *--sc2;
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else
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#if 0
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for (; 0 < n; --n)
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*sc1++ = *sc2++;
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#else
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memcpy (sc1, sc2, n);
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#endif
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return s1;
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}
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