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ASCII: Add hex char to value conversion function.

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This commit is contained in:
Michael Drake 2017-03-27 15:35:59 +01:00
parent 8caae83d35
commit b14aa97a2a
1 changed files with 20 additions and 0 deletions
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20
utils/ascii.h
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@ -167,6 +167,26 @@ static inline bool ascii_is_hex(char c)
ascii_is_af_lower(c));
}
/**
* Convert a hexadecimal character to its value.
*
* \param[in] c Character to convert.
* \return value of character (0-15), or -256 if not a hexadecimal character.
*/
static inline int ascii_hex_to_value(char c)
{
if (ascii_is_digit(c)) {
return c - '0';
} else if (ascii_is_af_lower(c)) {
return c - 'a' + 10;
} else if (ascii_is_af_upper(c)) {
return c - 'A' + 10;
}
/* Invalid hex */
return -256;
}
/**
* Convert an upper case character to lower case.
*