# 15-csv-fb-nolf: CSV to Fixed-Block Conversion (No Line Feed)

## 电信业务场景

外部CDR CSV取込(无LF)。读取外部系统提供的CSV格式CDR文件，使用STRING语句将各字段合并为固定长记录。无换行展开。

## Description

Reads a LINE SEQUENTIAL CSV file (comma-separated, 3 fields) and
converts each row to a fixed-length output record using the STRING
statement. Handles basic CSV quoting (double-quoted fields with
embedded commas).

## Record Layout

### Input (LINE SEQUENTIAL CSV)

Each line contains 3 comma-separated fields. Fields may be quoted
with double-quotes when they contain commas or leading/trailing spaces.

### Output (fixed-length: 100 bytes)

One fixed-length record per CSV row. Fields are joined with pipe ('|')
separators via STRING.

| Component | Description                |
|-----------|----------------------------|
| FIELD1    | Padded/spaced as parsed    |
| Separator | Pipe character '|'         |
| FIELD2    | Padded/spaced as parsed    |
| Separator | Pipe character '|'         |
| FIELD3    | Padded/spaced as parsed    |

## Files

| File                    | Purpose                        |
|-------------------------|--------------------------------|
| main-15-csv-fb-nolf.cbl | Main COBOL program             |
| data-gen.sh             | Generate CSV test data         |
| run.sh                  | Compile, run, verify           |
| README.md               | This file                      |

## Tests

| Test Case               | Description                         |
|-------------------------|-------------------------------------|
| Standard CSV            | Normal comma-separated values       |
| Empty middle field      | Field2 is empty (,,)                |
| Quoted commas           | Field contains embedded comma       |
| Quoted spaces           | Quoted field with padding spaces    |
| All empty               | Line with only commas               |
| Long text               | Field longer than usual             |

## Usage

```bash
cd 15-csv-fb-nolf
bash data-gen.sh
bash run.sh
```

## Expected Behavior

- Each CSV line produces exactly one fixed-length (100-byte) output record.
- Quoted fields are unquoted during parsing.
- Embedded commas within quoted fields are preserved.
- Output records use '|' as separator between fields.