#include <sys/types.h>#include <unistd.h>#include <fcntl.h>#include <string.h> intputenv(char *s){	int f, n;	char *value;	char buf[300]; 	value = strchr(s, '=');	if (value) {		n = value-s;		if(n<=0 || n > sizeof(buf)-6)			return -1;		strcpy(buf, "/env/");		strncpy(buf+5, s, n);		buf[n+5] = 0;		f = creat(buf, 0666);		if(f < 0)			return 1;		value++;		n = strlen(value);		if(write(f, value, n) != n)			return -1;		close(f);		return 0;	} else		return -1;}