QA·C Help - 0235

	0235	[U] Unknown escape sequence.

Explicitly undefined		REFERENCE - ISO:C90-6.1.3.4 Description, ISO:C90-6.9.2 Future Language Directions

A non-standard escape sequence has been used.

ISO:C Standard defines an escape sequence as being either:

a simple-escape-sequence, i.e. \', \", \?, \\, \a, \b, \f, \n, \r, \t, \v
an octal-escape-sequence, i.e. \ followed by up to three octal digits
a hexadecimal-escape-sequence, i.e. \x followed by any number of hexadecimal digits

For example:


/*PRQA S 1305,2017,3211,3408,3602,3625,3610,3628 ++*/

const char essq = '\'';
const char esbs = '\\';
const char esf = '\f';
const char esn = '\n';
const char est = '\t';
const char eon = '\012';
const char ehn = '\x0D';
const char esc = '\c';               /* Message 0235 */
const char esz = '\z';               /* Message 0235 */

MISRA-C:2004 Rules applicable to message 0235:

Rule 1.2 (Required)	No reliance shall be placed on undefined or unspecified behaviour.
Rule 4.1 (Required)	Only those escape sequences that are defined in the ISO C standard shall be used.

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MISRA-C:2004 Compliance Module 3.2
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