1 #include <stdlib.h> 2 #include <string.h> 3 #include <unistd.h> 4 getenv(const char * name)5char *getenv(const char *name) 6 { 7 size_t l = __strchrnul(name, '=') - name; 8 if (l && !name[l] && __environ) 9 for (char **e = __environ; *e; e++) 10 if (!strncmp(name, *e, l) && l[*e] == '=') 11 return *e + l+1; 12 return 0; 13 } 14