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libnpe: add unsetenv()

--- a/include/npe/stdlib.h

+++ b/include/npe/stdlib.h

@@ -17,6 +17,7 @@

 #define MB_CUR_MAX UTFmax

 int setenv(char *name, char *value, int overwrite);

+int unsetenv(char *name);

 char *realpath(char *path, char *buffer);

 int mkstemp(char *t);

 div_t div(int n, int d);

--- a/libnpe/setenv.c

+++ b/libnpe/setenv.c

@@ -13,3 +13,16 @@

 	return putenv(name, value);

 }

+

+int

+unsetenv(char *name)

+{

+	char ename[100];

+	if(name[0]=='\0' || strcmp(name, ".")==0 || strcmp(name, "..")==0 || strchr(name, '/')!=nil

+	|| strlen(name) >= sizeof(ename)-5){

+		werrstr("bad env name: %s", name);

+		return -1;

+	}

+	snprint(ename, sizeof(ename), "/env/%s", name);

+	return remove(ename);

+}

-- 

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