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eci.c: replace libiconv-adapted code with own implementations so

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as to fully comply with BSD license (for why Library GPL 2+ not
  compatible see https://opensource.stackexchange.com/a/6701),
  ~3% slower (maybe), +~6K extra in data
  (gb18030.c, gb2313.c & sjis.c removed, mapping .TXT files moved
  to backend/tools/data & extra ones added, 2 new PHP generators)
GUI: CODE39/EXCODE39: show/hide HIBC check digit option in addition
  to enable/disable (less confusing)
CLI: batch: pedantic check for EOF using intChar in newline fgetc()
  loop
test_args.c: don't use WIFEXITED(), WEXITSTATUS() on Windows
manual: lessen some copy/paste verbiage by referring back, other
  small tweaks/typos
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docs/manual.pmd
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@ -1911,7 +1911,7 @@ To treat all warnings as errors, set `symbol->warn_level` to `WARN_FAIL_ALL`.
## 5.8 Specifying a Symbology
Symbologies can be specified by number or by name as shown in the Table :
Symbologies can be specified by number or by name as shown in the Table
{@tbl:barcode_types}. For example
```c
@ -2275,18 +2275,16 @@ check digit but not show it in the Human Readable Text, set `--vers=2` (API
Used for baggage handling in the air-transport industry by the International
Air Transport Agency, this self-checking code will encode numeric input (digits
0-9) up to a maximum of 45 digits. No check digit is added by default. To add a
check digit, set `--vers=1` (API `option_2 = 1`). To add a check digit but not
show it in the Human Readable Text, set `--vers=2` (API `option_2 = 2`).
0-9) up to a maximum of 45 digits. No check digit is added by default. Check
digit options are the same as for [6.1.2.1 Standard Code 2 of 5].
#### 6.1.2.3 Industrial Code 2 of 5
![`zint -b C25IND -d "9212320967"`](images/c25ind.svg)
Industrial Code 2 of 5 can encode numeric input (digits 0-9) up to a maximum of
45 digits. No check digit is added by default. To add a check digit, set
`--vers=1` (API `option_2 = 1`). To add a check digit but not show it in the
Human Readable Text, set `--vers=2` (API `option_2 = 2`).
45 digits. No check digit is added by default. Check digit options are the same
as for [6.1.2.1 Standard Code 2 of 5].
#### 6.1.2.4 Interleaved Code 2 of 5 (ISO 16390)
@ -2295,18 +2293,16 @@ Human Readable Text, set `--vers=2` (API `option_2 = 2`).
This self-checking symbology encodes pairs of numbers, and so can only encode
an even number of digits (0-9). If an odd number of digits is entered a leading
zero is added by Zint. A maximum of 45 pairs (90 digits) can be encoded. No
check digit is added by default. To add a check digit, set `--vers=1` (API
`option_2 = 1`). To add a check digit but not show it in the Human Readable
Text, set `--vers=2` (API `option_2 = 2`).
check digit is added by default. Check digit options are the same as for
[6.1.2.1 Standard Code 2 of 5].
#### 6.1.2.5 Code 2 of 5 Data Logic
![`zint -b C25LOGIC -d "9212320967"`](images/c25logic.svg)
Data Logic does not include a check digit by default and can encode numeric
input (digits 0-9) up to a maximum of 80 digits. To add a check digit, set
`--vers=1` (API `option_2 = 1`). To add a check digit but not show it in the
Human Readable Text, set `--vers=2` (API `option_2 = 2`).
input (digits 0-9) up to a maximum of 80 digits. Check digit options are the
same as for [6.1.2.1 Standard Code 2 of 5].
#### 6.1.2.6 ITF-14
@ -2454,11 +2450,8 @@ If you are encoding an EAN-8 or EAN-13 symbol and your data already includes
the check digit then you can use symbology `BARCODE_EANX_CHK` (14) which takes
an 8 or 13-digit input and validates the check digit before encoding.
You can adjust the gap between the main symbol and an add-on in multiples of
the X-dimension by setting `--addongap` (API `option_2`) to a value between 7
(default) and 12. The height in X-dimensions that the guard bars descend below
the main bars can be adjusted by setting `--guarddescent` (API `guard_descent`)
to a value between 0 and 20 (default 5).
Options to adjust the add-on gap and the descent height of guard bars are the
same as for [6.1.3.2 UPC Version E].
#### 6.1.4.2 SBN, ISBN and ISBN-13
@ -2468,10 +2461,8 @@ EAN-13 symbols (also known as Bookland EAN-13) can also be produced from
9-digit SBN, 10-digit ISBN or 13-digit ISBN-13 data. The relevant check digit
needs to be present in the input data and will be verified before the symbol is
generated. In addition EAN-2 and EAN-5 add-on symbols can be added using the +
character as with UPC symbols, and the gap set with `--addongap` (API
`option_2`) to between 7 (default) and 12. The height that the guard bars
descend can be adjusted by setting `--guarddescent` (API `guard_descent`) to a
value between 0 and 20 (default 5).
character as with UPC symbols, and there are options to adjust the add-on gap
and the descent height of guard bars - see [6.1.3.2 UPC Version E].
### 6.1.5 Plessey
@ -2848,7 +2839,7 @@ zint --bind --notext --separator=2 -d "This" -d "That"
"That"`](images/code128_stacked_sep2.svg)
A more sophisticated method is to use some type of line indexing which indicates
to the barcode reader which order the symbols should be read. This is
to the barcode reader which order the symbols should be read in. This is
demonstrated by the symbologies below.
### 6.2.2 Codablock-F
@ -4102,7 +4093,7 @@ international standards:
Interpretations Part 3: Register (Version 2, February 2022)
# A. Character Encoding
# Annex A. Character Encoding
This section is intended as a quick reference to the character sets used by
Zint. All symbologies use standard ASCII input as shown in section A.1, but
@ -4164,4 +4155,4 @@ F `¯` `¿` `Ï` `ß` `ï` `ÿ`
Table: {#tbl:iso_iec_8869_1 tag=": ISO/IEC 8859-1"}
# B. zint(1) Man Page
# Annex B. zint(1) Man Page