lint_yymmd0.c File Reference

Macros
#define	CURRENT_YEAR   21
	20YY: For converting YY to 19YY, 20YY, 21YY, etc. for leap year validation

Purpose

The yymmd0 linter ensures that the data represents a meaningful date, in YYMMDD format, additionally permitting YYMM00 format indicating an unspecified day.

Functional Description

gs1_lint_yymmd0()

GS1_SYNTAX_DICTIONARY_API gs1_lint_err_t gs1_lint_yymmd0	(	const char *const	data,
		size_t	data_len,
		size_t *const	err_pos,
		size_t *const	err_len
	)

Used to ensure that an AI component conforms to the YYMMDD or YYMM00 formats.

Parameters

[in]	data	Pointer to the data to be linted. Must not be NULL.
[in]	data_len	Length of the data to be linted.
[out]	err_pos	To facilitate error highlighting, the start position of the bad data is written to this pointer, if not NULL.
[out]	err_len	The length of the bad data is written to this pointer, if not NULL.

Returns

GS1_LINTER_OK if okay.

GS1_LINTER_DATE_TOO_SHORT if the data is too short for YYMMDD format.

GS1_LINTER_DATE_TOO_LONG if the data is too long for YYMMDD format.

GS1_LINTER_NON_DIGIT_CHARACTER if the data contains a non-digit character.

GS1_LINTER_ILLEGAL_MONTH if the data contains an invalid month.

GS1_LINTER_ILLEGAL_DAY if the data contains an invalid day of the month.

{
 
/// \cond
#define YY ( (data[0] - '0') * 10 + (data[1] - '0') )
/// \endcond
 
        size_t pos;
        char yyyymmdd[8];
        gs1_lint_err_t ret;
 
        assert(data);
 
        /*
         * Data must be six characters.
         *
         */
        if (GS1_LINTER_UNLIKELY(data_len != 6))
                GS1_LINTER_RETURN_ERROR(
                        (data_len < 6) ? GS1_LINTER_DATE_TOO_SHORT : GS1_LINTER_DATE_TOO_LONG,
                        0,
                        data_len
                );
 
        /*
         * Data must consist of all digits.
         *
         */
        for (pos = 0; pos < 6; pos++) {
                if (GS1_LINTER_UNLIKELY(data[pos] < '0' || data[pos] > '9'))
                        GS1_LINTER_RETURN_ERROR(
                                GS1_LINTER_NON_DIGIT_CHARACTER,
                                pos,
                                1
                        );
        }
 
        memcpy(yyyymmdd + 2, data, 6);
 
        /*
         * Convert YY to a year using a horizon based on CURRENT_YEAR.
         *
         */
        if (YY - CURRENT_YEAR >= 51) {
                yyyymmdd[0] = '1'; yyyymmdd[1] = '9';
        } else if (YY - CURRENT_YEAR > -50) {
                yyyymmdd[0] = '2'; yyyymmdd[1] = '0';
        } else {
                yyyymmdd[0] = '2'; yyyymmdd[1] = '1';
        }
 
        ret = gs1_lint_yyyymmd0(yyyymmdd, 8, err_pos, err_len);
 
        assert(ret == GS1_LINTER_OK ||
               ret == GS1_LINTER_ILLEGAL_MONTH ||
               ret == GS1_LINTER_ILLEGAL_DAY);
 
        assert(!err_pos || ret == GS1_LINTER_OK || (*err_pos >= 2));
        assert(!err_pos || !err_len || ret == GS1_LINTER_OK || (*err_pos + *err_len <= 8));
 
        if (GS1_LINTER_UNLIKELY(ret != GS1_LINTER_OK))
                GS1_LINTER_RETURN_ERROR(
                        ret,
                        *err_pos - 2,
                        *err_len
                );
 
        GS1_LINTER_RETURN_OK;
 
}