1 files changed, 48 insertions, 0 deletions
diff --git a/libexec_unsetenv.c b/libexec_unsetenv.c
new file mode 100644
index 0000000..48ec645
--- /dev/null
+++ b/libexec_unsetenv.c
@@ -0,0 +1,48 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+#ifndef TEST
+
+
+int
+libexec_unsetenv(struct libexec_command *cmd, const char *name)
+{
+	char **env;
+	size_t i, n, len;
+
+	if (!cmd || !name) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	if (strchr(name, '='))
+		return 0;
+
+	env = cmd->environ ? cmd->environ : environ;
+	len = strlen(name);
+
+	n = 0;
+	while (env[n])
+		n++;
+
+	for (i = 0; i < n;) {
+		if (!strncmp(env[i], name, len) && env[i][len] == '=') {
+			if (!cmd->environ) {
+				if (libexec_copy_environ(cmd, NULL))
+					return -1;
+				env = cmd->environ;
+			}
+			free(env);
+			memmove(&env[i], &env[i + 1], (n - i - 1) * sizeof(*env));
+			n--;
+		} else {
+			i++;
+		}
+	}
+
+	return 0;
+}
+
+
+#else
+LIBEXEC_CONST__ int main(void) {return 0;} /* TODO test */
+#endif