From c33922f128403f5d05d24f19abeaad2368ce5467 Mon Sep 17 00:00:00 2001
From: Sergey Poznyakoff <gray@gnu.org>
Date: Fri, 7 Jun 2019 08:00:32 +0300
Subject: Implement additional env.eval statement

---
 lib/envop.c | 51 +++++++++++++++++++++++++++++++++------------------
 1 file changed, 33 insertions(+), 18 deletions(-)

(limited to 'lib')

diff --git a/lib/envop.c b/lib/envop.c
index ce24b92..93bd425 100644
--- a/lib/envop.c
+++ b/lib/envop.c
@@ -167,13 +167,15 @@ environ_set (environ_t *env, char const *name, char const *value)
   char *def;
   struct wordsplit ws;
 
-  if (!name)
+  if (!value)
     {
-      errno = EINVAL;
-      return -1;
+      if (!name)
+	{
+	  errno = EINVAL;
+	  return -1;
+	}
+      return environ_unset (env, name, value);
     }
-  if (!value)
-    return environ_unset (env, name, value);
 
   ws.ws_env = (char const **) env->env_base;
   if (wordsplit (value, &ws,
@@ -191,7 +193,18 @@ environ_set (environ_t *env, char const *name, char const *value)
       return -1;
     }
 
-  if (strcmp (name, ":") == 0)
+  if (ws.ws_envbuf)
+    {
+      free (env->env_base);
+      env->env_base = ws.ws_envbuf;
+      env->env_count = ws.ws_envidx;
+      env->env_max = ws.ws_envsiz;
+      ws.ws_envbuf = NULL;
+      ws.ws_envidx = 0;
+      ws.ws_envsiz = 0;
+    }
+
+  if (name == NULL || strcmp (name, ":") == 0)
     {
       wordsplit_free (&ws);
       return 0;
@@ -334,6 +347,7 @@ envop_entry_add (struct envop_entry **head,
 {
   struct envop_entry *op;
   size_t s;
+  char *p;
 
   switch (code)
     {
@@ -341,7 +355,7 @@ envop_entry_add (struct envop_entry **head,
       break;
       
     case envop_set:
-      if (!name || !(*name == ':' || valid_envar_name (name)))
+      if (name && !(*name == ':' || valid_envar_name (name)))
 	{
 	  errno = EINVAL;
 	  return -1;
@@ -359,11 +373,9 @@ envop_entry_add (struct envop_entry **head,
 
   s = sizeof (op[0]);
   if (name)
-    {
-      s += strlen (name) + 1;
-      if (value)
-	s += strlen (value) + 1;
-    }
+    s += strlen (name) + 1;
+  if (value)
+    s += strlen (value) + 1;
   op = malloc (s);
   if (!op)
     return -1;
@@ -371,15 +383,18 @@ envop_entry_add (struct envop_entry **head,
   op->code = code;
   op->name = NULL;
   op->value = NULL;
+
+  p = (char*)(op + 1);
   if (name)
     {
-      op->name = (char*)(op + 1);
+      op->name = p;
       strcpy (op->name, name);
-      if (value)
-	{
-	  op->value = op->name + strlen (name) + 1;
-	  strcpy (op->value, value);
-	}
+      p += strlen (name) + 1;
+    }
+  if (value)
+    {
+      op->value = p;
+      strcpy (op->value, value);
     }
   envop_entry_insert (head, op);
   return 0;
-- 
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