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Add getenv_ulong() to read an integer from an environment variable

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This is not an uncommon operation in U-Boot, so let's put it in a common
function.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Simon Glass 2011-10-14 13:25:18 +00:00 committed by Wolfgang Denk
parent 3668d8fa04
commit 4a9b413108
2 changed files with 21 additions and 0 deletions
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20
common/cmd_nvedit.c
View File

@ -540,6 +540,26 @@ int getenv_f(const char *name, char *buf, unsigned len)
return -1;
}
/**
* Decode the integer value of an environment variable and return it.
*
* @param name Name of environemnt variable
* @param base Number base to use (normally 10, or 16 for hex)
* @param default_val Default value to return if the variable is not
* found
* @return the decoded value, or default_val if not found
*/
ulong getenv_ulong(const char *name, int base, ulong default_val)
{
/*
* We can use getenv() here, even before relocation, since the
* environment variable value is an integer and thus short.
*/
const char *str = getenv(name);
return str ? simple_strtoul(str, NULL, base) : default_val;
}
#if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
int do_env_save(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])

1
include/common.h
View File

@ -297,6 +297,7 @@ void env_relocate (void);
int envmatch (uchar *, int);
char *getenv (const char *);
int getenv_f (const char *name, char *buf, unsigned len);
ulong getenv_ulong(const char *name, int base, ulong default_val);
int saveenv (void);
#ifdef CONFIG_PPC /* ARM version to be fixed! */
int inline setenv (const char *, const char *);