lint_nozeroprefix.c File Reference

Purpose

The nozeroprefix linter ensures that the given data does not start with a zero.

Functional Description

gs1_lint_nozeroprefix()

GS1_SYNTAX_DICTIONARY_API gs1_lint_err_t gs1_lint_nozeroprefix	(	const char *const	data,
		size_t *const	err_pos,
		size_t *const	err_len
	)

Used to validate that a numeric AI component does not start with zero.

Parameters

[in]	data	Pointer to the null-terminated data to be linted. Must not be NULL.
[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_ILLEGAL_ZERO_PREFIX if the data starts with zero.

GS1_LINTER_NON_DIGIT_CHARACTER if the data contains non-digit characters.

{
 
        size_t pos;
 
        assert(data);
 
        /*
         * Data must not start with a zero
         */
        if (GS1_LINTER_UNLIKELY(*data == '0'))
                GS1_LINTER_RETURN_ERROR(
                        GS1_LINTER_ILLEGAL_ZERO_PREFIX,
                        0,
                        1
                );
 
        /*
         * Validate digits using direct range checking
         */
        for (pos = 0; data[pos] != '\0'; pos++) {
                if (GS1_LINTER_UNLIKELY(data[pos] < '0' || data[pos] > '9'))
                        GS1_LINTER_RETURN_ERROR(
                                GS1_LINTER_NON_DIGIT_CHARACTER,
                                pos,
                                1
                        );
        }
 
        GS1_LINTER_RETURN_OK;
 
}