Add xunsetenv() for the error checking.

2 files changed, 7 insertions, 0 deletions

diff --git a/lib/env.c b/lib/env.c
index 94ea0a4e..35ef688c 100644
--- a/lib/env.c
+++ b/lib/env.c
@@ -80,6 +80,12 @@ void xsetenv(char *name, char *val)
   environ[i] = new;
 }
 
+void xunsetenv(char *name)
+{
+  if (strchr(name, '=')) error_exit("xunsetenv %s name has =", name);
+  xsetenv(name, 0);
+}
+
 // reset environment for a user, optionally clearing most of it
 void reset_env(struct passwd *p, int clear)
 {
diff --git a/lib/lib.h b/lib/lib.h
index 82c4c16e..7572a8a3 100644
--- a/lib/lib.h
+++ b/lib/lib.h
@@ -275,6 +275,7 @@ int human_readable(char *buf, unsigned long long num, int style);
 
 long environ_bytes();
 void xsetenv(char *name, char *val);
+void xunsetenv(char *name);
 void xclearenv(void);
 
 // linestack.c