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Add getenv_hex() to return an environment variable as hex

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This conversion is required in a number of places in U-Boot. Add a
standard function to provide this feature, so we avoid all the different
variations in the way it is coded.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2013-04-20 08:42:43 +00:00
committed by Tom Rini
parent d14da91307
commit 76b8f79c29
2 changed files with 28 additions and 0 deletions
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13
include/common.h
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@@ -352,6 +352,19 @@ 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);
/**
* getenv_hex() - Return an environment variable as a hex value
*
* Decode an environment as a hex number (it may or may not have a 0x
* prefix). If the environment variable cannot be found, or does not start
* with hex digits, the default value is returned.
*
* @varname: Variable to decode
* @default_val: Value to return on error
*/
ulong getenv_hex(const char *varname, ulong default_val);
/*
* Read an environment variable as a boolean
* Return -1 if variable does not exist (default to true)