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#include <stdlib.h>
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extern	char **environ;
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char *
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getenv(const char *name)
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{
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	char **p = environ;
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	char *s1, *s2;
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	while (*p != NULL){
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		for(s1 = (char *)name, s2 = *p++; *s1 == *s2; s1++, s2++)
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			continue;
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		if(*s1 == '\0' && *s2 == '=')
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			return s2+1;
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	}
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	return NULL ;
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}