gcc -O3 -o taxid_gen taxid_gen.c
./taxid_gen | john --stdin ...

Usage: ./emso_gen [OPTIONS]
Generate EMSO numbers

Options:
  --day-start DD        Start day (01-31, default: 01)
  --day-end DD          End day (01-31, default: 31)
  --month-start MM      Start month (01-12, default: 01)
  --month-end MM        End month (01-12, default: 12)
  --year-start YYYY     Start year (e.g., 1980 or 980; default: current year - 100)
  --year-end YYYY       End year (e.g., 2025 or 025; default: current year)
  --ordinal-start OOO   Start ordinal (000-999, default: 000)
  --ordinal-end OOO     End ordinal (000-999, default: 999)
  --male                Generate only male EMSOs (ordinal 000-499)
  --female              Generate only female EMSOs (ordinal 500-999)
                        Both flags together: generate all (ordinal 000-999)
  --region MODE         Region mode: ALL (00-99), SLOVENIA (date-based), QUICK (50)
                        SLOVENIA: 50 for dates until 2023, 50-59 from 2024 onwards
                        Default: SLOVENIA
  --region-start RR     Override region start (00-99)
  --region-end RR       Override region end (00-99)

Region codes reference:
  00-09   Foreigners
  10-19   Bosnia and Herzegovina
  20-29   Montenegro
  30-39   Croatia (33 - Zagreb)
  40-49   Macedonia
  50-59   Slovenia (until 2024 only 50 was used)
  60-69   Citizens with temporary residence
  70-79   Serbia proper (71 - Belgrade)
  80-89   Vojvodina province (80 - Novi Sad)
  90-99   Kosovo province
  --help                Show this help message