Acceptable Escape Sequences?

[gs]

Hi,
Rule 4.1 states

Only those escape sequences that are defined in the ISO C standard shall be used.

The explanatory text then refers the Reader to section 5.2.2 of the C99 Standard for a list of escape sequences. However, 6.4.4.4 also defines an escape-sequence syntax as

Code:

escape-sequence:
       simple-escape-sequence
       octal-escape-sequence
       hexadecimal-escape-sequence
       universal-character-name

and a hexadecimal-escape-sequence as

Code:

hexadecimal-escape-sequence:
       \x hexadecimal-digit
       hexadecimal-escape-sequence hexadecimal-digit

The use of '\x' i not mentioned in 5.2.2 as a valid escape-sequence. Are hexadecimal escape-sequences permitted under MISRA 2004 Rule 4.1?

[Lundin]

Hexadecimal is not allowed.

You will want to download the Technical Corrigendum 1, which clarifies rule 4.1, among other things.

[gs]

Does this prohibition apply to MISRA C 1998, Rule 5, as well?

[misra-c]

MISRA-C 1998 has been superceded by MISRA-C 2004 as amended by TC1.

MISRA have no plans to provide further direction on MISRA-C 1998.

MISRA are offering no direction on how to apply subsequent changes to obsolete versions of the document.

Note: Both MISRA-C 1998 and MISRA-C 2004 & TC1 are based on the 1990 version of the C standard, and not the 1999 version.