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b79f73df JL |
1 | /* Implement string-related runtime actions for CHILL. |
2 | Copyright (C) 1992,1993 Free Software Foundation, Inc. | |
3 | Author: Bill Cox | |
4 | ||
5 | This file is part of GNU CC. | |
6 | ||
7 | GNU CC is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2, or (at your option) | |
10 | any later version. | |
11 | ||
12 | GNU CC is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GNU CC; see the file COPYING. If not, write to | |
201853b4 JL |
19 | the Free Software Foundation, 59 Temple Place - Suite 330, |
20 | Boston, MA 02111-1307, USA. */ | |
b79f73df | 21 | |
502b941f JL |
22 | /* As a special exception, if you link this library with other files, |
23 | some of which are compiled with GCC, to produce an executable, | |
24 | this library does not by itself cause the resulting executable | |
25 | to be covered by the GNU General Public License. | |
26 | This exception does not however invalidate any other reasons why | |
27 | the executable file might be covered by the GNU General Public License. */ | |
28 | ||
b79f73df JL |
29 | #define MIN(a, b) ((a) < (b) ? (a) : (b)) |
30 | ||
31 | ||
32 | /* | |
33 | * function memmove | |
34 | * | |
35 | * parameters: | |
36 | * S1 - pointer to destination string | |
37 | * S2 - pointer to source string | |
38 | * LEN - length of string | |
39 | * | |
40 | * returns: | |
41 | * pointer to destination string | |
42 | * | |
43 | * exceptions: | |
44 | * none | |
45 | * | |
46 | * abstract: | |
47 | * copies a string safely, where the source and dest areas may overlap. | |
48 | * | |
49 | */ | |
50 | ||
51 | void * | |
52 | memmove (s1, s2, n) | |
53 | void *s1; | |
54 | const void *s2; | |
55 | int n; | |
56 | { | |
57 | char *sc1 = s1; | |
58 | const char *sc2 = s2; | |
59 | ||
60 | if (sc2 < sc1 && (sc1 < sc2 + n)) | |
61 | for (sc1 += n, sc2 += n; 0 < n; --n) | |
62 | *--sc1 = *--sc2; | |
63 | else | |
64 | #if 0 | |
65 | for (; 0 < n; --n) | |
66 | *sc1++ = *sc2++; | |
67 | #else | |
68 | memcpy (sc1, sc2, n); | |
69 | #endif | |
70 | return s1; | |
71 | } |