1 files changed, 19 insertions, 0 deletions
diff --git a/src/libenvexec/env_addmodif.c b/src/libenvexec/env_addmodif.c
new file mode 100644
index 0000000..ddd1be3
--- /dev/null
+++ b/src/libenvexec/env_addmodif.c
@@ -0,0 +1,19 @@
+/* ISC license. */
+
+#include <sys/types.h>
+#include <skalibs/stralloc.h>
+#include <skalibs/env.h>
+
+int env_addmodif (stralloc *sa, char const *s, char const *t)
+{
+  size_t oldlen = sa->len ;
+  if (!s) return 1 ;
+  if (!stralloc_cats(sa, s)) return 0 ;
+  if ((t && (!stralloc_catb(sa, "=", 1) || !stralloc_cats(sa, t)))
+   || !stralloc_0(sa))
+  {
+    sa->len = oldlen ;
+    return 0 ;
+  }
+  return 1 ;
+}