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C25/DBAR: use new func gs1_check_digit() for common GS1 check digit calc

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CODE11/CODE39/EXCODE39/CODE93/PZN/CHANNEL/VIN/DBAR/UPCEAN: fuller error messages
DATAMATRIX: look_ahead_test debug counts
DBAR: consolidate option_2 cols_per_row
CMakeLists.txt: restore -fno-var-tracking-assignments for gcc no DEBUG
overall: suppress various warnings on various configs
testcommon.c: clean-up
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gitlost 2021-06-27 11:47:55 +01:00
parent 33ebcea30c
commit 52c00e59ba
30 changed files with 739 additions and 715 deletions
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14
backend/gs1.c
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@ -1386,3 +1386,17 @@ INTERNAL int gs1_verify(struct zint_symbol *symbol, const unsigned char source[]
/* the character '[' in the reduced string refers to the FNC1 character */
return error_value;
}
/* Helper to return standard GS1 check digit (GS1 General Specifications 7.9.1) */
INTERNAL char gs1_check_digit(const unsigned char source[], const int length) {
int i;
int count = 0;
int factor = length & 1 ? 3 : 1;
for (i = 0; i < length; i++) {
count += factor * ctoi(source[i]);
factor = factor == 1 ? 3 : 1;
}
return itoc((10 - (count % 10)) % 10);
}