made safer
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			@ -5,6 +5,7 @@ register char *name;
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  extern char **environ;
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  register char **v = environ, *p, *q;
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  if (v == 0 || name == 0) return 0;
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  while ((p = *v++) != 0) {
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	q = name;
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	while (*q && *q++ == *p++) /* nothing */ ;
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