[PATCH 3/5] env: Simplify env_get_default()

["Marek Behún" <kabel@kernel.org>]

From: Marek Behún <marek.behun@nic.cz>

Instead of pretending that we don't have environment to force searching
default environment in env_get_default(), get the data from the
default_environment[] buffer directly.

Signed-off-by: Marek Behún <marek.behun@nic.cz>
---
 env/common.c | 45 ++++++++++++++++++++++++---------------------
 1 file changed, 24 insertions(+), 21 deletions(-)

diff --git a/env/common.c b/env/common.c
index 757c5f9ecd..208e2adaa0 100644
--- a/env/common.c
+++ b/env/common.c
@@ -148,12 +148,10 @@ char *from_env(const char *envvar)
 	return ret;
 }
 
-/*
- * Look up variable from environment for restricted C runtime env.
- */
-int env_get_f(const char *name, char *buf, unsigned len)
+static int env_get_from_linear(const char *env, const char *name, char *buf,
+			       unsigned len)
 {
-	const char *env, *p, *end;
+	const char *p, *end;
 	size_t name_len;
 
 	if (name == NULL || *name == '\0')
@@ -161,11 +159,6 @@ int env_get_f(const char *name, char *buf, unsigned len)
 
 	name_len = strlen(name);
 
-	if (gd->env_valid == ENV_INVALID)
-		env = default_environment;
-	else
-		env = (const char *)gd->env_addr;
-
 	for (p = env; *p != '\0'; p = end + 1) {
 		const char *value;
 		unsigned res;
@@ -193,6 +186,21 @@ int env_get_f(const char *name, char *buf, unsigned len)
 	return -1;
 }
 
+/*
+ * Look up variable from environment for restricted C runtime env.
+ */
+int env_get_f(const char *name, char *buf, unsigned len)
+{
+	const char *env;
+
+	if (gd->env_valid == ENV_INVALID)
+		env = default_environment;
+	else
+		env = (const char *)gd->env_addr;
+
+	return env_get_from_linear(env, name, buf, len);
+}
+
 /**
  * Decode the integer value of an environment variable and return it.
  *
@@ -232,17 +240,12 @@ int env_get_yesno(const char *var)
  */
 char *env_get_default(const char *name)
 {
-	char *ret_val;
-	unsigned long really_valid = gd->env_valid;
-	unsigned long real_gd_flags = gd->flags;
-
-	/* Pretend that the image is bad. */
-	gd->flags &= ~GD_FLG_ENV_READY;
-	gd->env_valid = ENV_INVALID;
-	ret_val = env_get(name);
-	gd->env_valid = really_valid;
-	gd->flags = real_gd_flags;
-	return ret_val;
+	if (env_get_from_linear(default_environment, name,
+				(char *)(gd->env_buf),
+				sizeof(gd->env_buf)) >= 0)
+		return (char *)(gd->env_buf);
+
+	return NULL;
 }
 
 void env_set_default(const char *s, int flags)
-- 
2.32.0