Add getenv_hex() to return an environment variable as hex
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>
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@ -315,6 +315,21 @@ int setenv_hex(const char *varname, ulong value)
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return setenv(varname, str);
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}
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ulong getenv_hex(const char *varname, ulong default_val)
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{
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const char *s;
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ulong value;
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char *endp;
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s = getenv(varname);
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if (s)
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value = simple_strtoul(s, &endp, 16);
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if (!s || endp == s)
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return default_val;
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return value;
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}
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#ifndef CONFIG_SPL_BUILD
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static int do_env_set(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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@ -352,6 +352,19 @@ int envmatch (uchar *, int);
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char *getenv (const char *);
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int getenv_f (const char *name, char *buf, unsigned len);
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ulong getenv_ulong(const char *name, int base, ulong default_val);
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/**
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* getenv_hex() - Return an environment variable as a hex value
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*
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* Decode an environment as a hex number (it may or may not have a 0x
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* prefix). If the environment variable cannot be found, or does not start
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* with hex digits, the default value is returned.
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*
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* @varname: Variable to decode
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* @default_val: Value to return on error
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*/
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ulong getenv_hex(const char *varname, ulong default_val);
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/*
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* Read an environment variable as a boolean
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* Return -1 if variable does not exist (default to true)
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