1*c9945492SAndroid Build Coastguard Worker #include <stdlib.h> 2*c9945492SAndroid Build Coastguard Worker #include <string.h> 3*c9945492SAndroid Build Coastguard Worker #include <errno.h> 4*c9945492SAndroid Build Coastguard Worker #include <unistd.h> 5*c9945492SAndroid Build Coastguard Worker dummy(char * old,char * new)6*c9945492SAndroid Build Coastguard Workerstatic void dummy(char *old, char *new) {} 7*c9945492SAndroid Build Coastguard Worker weak_alias(dummy, __env_rm_add); 8*c9945492SAndroid Build Coastguard Worker unsetenv(const char * name)9*c9945492SAndroid Build Coastguard Workerint unsetenv(const char *name) 10*c9945492SAndroid Build Coastguard Worker { 11*c9945492SAndroid Build Coastguard Worker size_t l = __strchrnul(name, '=') - name; 12*c9945492SAndroid Build Coastguard Worker if (!l || name[l]) { 13*c9945492SAndroid Build Coastguard Worker errno = EINVAL; 14*c9945492SAndroid Build Coastguard Worker return -1; 15*c9945492SAndroid Build Coastguard Worker } 16*c9945492SAndroid Build Coastguard Worker if (__environ) { 17*c9945492SAndroid Build Coastguard Worker char **e = __environ, **eo = e; 18*c9945492SAndroid Build Coastguard Worker for (; *e; e++) 19*c9945492SAndroid Build Coastguard Worker if (!strncmp(name, *e, l) && l[*e] == '=') 20*c9945492SAndroid Build Coastguard Worker __env_rm_add(*e, 0); 21*c9945492SAndroid Build Coastguard Worker else if (eo != e) 22*c9945492SAndroid Build Coastguard Worker *eo++ = *e; 23*c9945492SAndroid Build Coastguard Worker else 24*c9945492SAndroid Build Coastguard Worker eo++; 25*c9945492SAndroid Build Coastguard Worker if (eo != e) *eo = 0; 26*c9945492SAndroid Build Coastguard Worker } 27*c9945492SAndroid Build Coastguard Worker return 0; 28*c9945492SAndroid Build Coastguard Worker } 29