Mercurial > cpython-lru_cache-weakref

annotate Python/memmove.c @ 17848:6960b2bbbfca legacy-trunk

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First step in porting MacPython modules to OSX/unix: break all references between modules except for the obj_New() and obj_Convert() routines, the PyArg_Parse and Py_BuildValue helpers. And these can now be vectored through glue routines (by defining USE_TOOLBOX_OBJECT_GLUE) which will do the necessary imports, whereupon the module's init routine will tell the glue routine about the real conversion routine address and everything is fine again.
author Jack Jansen <jack.jansen@cwi.nl>
date Thu, 17 May 2001 21:58:34 +0000
parents 6f6f965c5e2d
children
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1
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2 /* A perhaps slow but I hope correct implementation of memmove */
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3
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f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
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4 extern char *memcpy(char *, char *, int);
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6 char *
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7 memmove(char *dst, char *src, int n)
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8 {
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9 char *realdst = dst;
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10 if (n <= 0)
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11 return dst;
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12 if (src >= dst+n || dst >= src+n)
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13 return memcpy(dst, src, n);
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14 if (src > dst) {
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15 while (--n >= 0)
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16 *dst++ = *src++;
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17 }
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18 else if (src < dst) {
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19 src += n;
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20 dst += n;
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21 while (--n >= 0)
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22 *--dst = *--src;
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23 }
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24 return realdst;
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25 }