From: Quentin Schulz Date: Wed, 17 Jan 2024 17:59:11 +0000 (+0100) Subject: env: allow to copy value from default environment into a buffer X-Git-Url: http://git.dujemihanovic.xyz/?a=commitdiff_plain;h=23c1ab92be6332fb528efc2d549898a5f1d17bf9;p=u-boot.git env: allow to copy value from default environment into a buffer env_get_default suffers from a particular issue int that it can only return a value truncated to gd->env_buf (32) characters. This may be enough for most variables but it isn't for others, so let's allow users to provide a preallocated buffer to copy the value into instead, allowing for more control, though it'll still be truncated if the value size is bigger than the preallocated buffer. Cc: Quentin Schulz Reviewed-by: Tom Rini Reviewed-by: Kever Yang Signed-off-by: Quentin Schulz --- diff --git a/env/common.c b/env/common.c index 656748c1f5..ebcb10854d 100644 --- a/env/common.c +++ b/env/common.c @@ -359,6 +359,14 @@ char *env_get_default(const char *name) return NULL; } +/* + * Look up the variable from the default environment and store its value in buf + */ +int env_get_default_into(const char *name, char *buf, unsigned int len) +{ + return env_get_from_linear(default_environment, name, buf, len); +} + void env_set_default(const char *s, int flags) { if (s) { diff --git a/include/env.h b/include/env.h index 9778e3e4f2..d2a5954ded 100644 --- a/include/env.h +++ b/include/env.h @@ -356,6 +356,16 @@ int env_import_redund(const char *buf1, int buf1_read_fail, */ char *env_get_default(const char *name); +/** + * env_get_default_into() - Look up a variable from the default environment and + * copy its value in buf. + * + * @name: Variable to look up + * Return: actual length of the variable value excluding the terminating + * NULL-byte, or -1 if the variable is not found + */ +int env_get_default_into(const char *name, char *buf, unsigned int len); + /* [re]set to the default environment */ void env_set_default(const char *s, int flags);