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#include <string.h>
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#define	N	256
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char*
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strtok_r(char *s, const char *b, char **last)
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{
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	char map[N], *os;
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	memset(map, 0, N);
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	while(*b)
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		map[*(unsigned char*)b++] = 1;
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	if(s == 0)
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		s = *last;
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	while(map[*(unsigned char*)s++])
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		;
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	if(*--s == 0)
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		return 0;
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	os = s;
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	while(map[*(unsigned char*)s] == 0)
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		if(*s++ == 0) {
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			*last = s-1;
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			return os;
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		}
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	*s++ = 0;
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	*last = s;
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	return os;
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}
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char*
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strtok(char *s, const char *b)
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{
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	static char *under_rock;
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	return strtok_r(s, b, &under_rock);
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}