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26 lines
439 B
26 lines
439 B
4 years ago
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/* A perhaps slow but I hope correct implementation of memmove */
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extern char *memcpy(char *, char *, int);
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char *
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memmove(char *dst, char *src, int n)
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{
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char *realdst = dst;
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if (n <= 0)
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return dst;
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if (src >= dst+n || dst >= src+n)
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return memcpy(dst, src, n);
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if (src > dst) {
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while (--n >= 0)
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*dst++ = *src++;
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}
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else if (src < dst) {
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src += n;
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dst += n;
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while (--n >= 0)
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*--dst = *--src;
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}
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return realdst;
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}
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