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70 lines
1.8 KiB
C
70 lines
1.8 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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extern void cause_exception (char *exname, char *file, int lineno);
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/*
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* function __concatstring
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*
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* parameters:
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* OUT - pointer to output string
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* S1 - pointer to left string
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* LEN1 - length of left string
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* S2 - pointer to right string
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* LEN2 - length of right string
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*
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* returns:
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* pointer to OUT 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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* concatenates two character strings into the output string
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*
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*/
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char *
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__concatstring (out, s1, len1, s2, len2)
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char *out, *s1;
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int len1;
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char *s2;
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int len2;
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{
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if (out)
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{
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if (s2 /* Check for overlap between s2 and out. */
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&& ((s2 >= out && s2 < (out + len1 + len2))
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|| (s2 + len2 > out && s2 <= out + len1)))
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{
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char *tmp = alloca (len2);
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memcpy (tmp, s2, len2);
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s2 = tmp;
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}
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if (s1)
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memmove (out, s1, len1);
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if (s2)
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memcpy (&out[len1], s2, len2);
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}
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return out;
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}
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