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# Check tz tables for consistency. 
 
# Contributed by Paul Eggert.  This file is in the public domain. 
 
BEGIN { 
        FS = "\t" 
 
        if (!iso_table) iso_table = "iso3166.tab" 
        if (!zone_table) zone_table = "zone1970.tab" 
        if (!want_warnings) want_warnings = -1 
 
        while (getline <iso_table) { 
                iso_NR++ 
                if ($0 ~ /^#/) continue 
                if (NF != 2) { 
                        printf "%s:%d: wrong number of columns\n", \ 
                                iso_table, iso_NR >>"/dev/stderr" 
                        status = 1 
                } 
                cc = $1 
                name = $2 
                if (cc !~ /^[A-Z][A-Z]$/) { 
                        printf "%s:%d: invalid country code '%s'\n", \ 
                                iso_table, iso_NR, cc >>"/dev/stderr" 
                        status = 1 
                } 
                if (cc <= cc0) { 
                        if (cc == cc0) { 
                                s = "duplicate"; 
                        } else { 
                                s = "out of order"; 
                        } 
 
                        printf "%s:%d: country code '%s' is %s\n", \ 
                                iso_table, iso_NR, cc, s \ 
                                >>"/dev/stderr" 
                        status = 1 
                } 
                cc0 = cc 
                if (name2cc[name]) { 
                        printf "%s:%d: '%s' and '%s' have the same name\n", \ 
                                iso_table, iso_NR, name2cc[name], cc \ 
                                >>"/dev/stderr" 
                        status = 1 
                } 
                name2cc[name] = cc 
                cc2name[cc] = name 
                cc2NR[cc] = iso_NR 
        } 
 
        cc0 = "" 
 
        while (getline <zone_table) { 
                zone_NR++ 
                if ($0 ~ /^#/) continue 
                if (NF != 3 && NF != 4) { 
                        printf "%s:%d: wrong number of columns\n", \ 
                                zone_table, zone_NR >>"/dev/stderr" 
                        status = 1 
                } 
                split($1, cca, /,/) 
                cc = cca[1] 
                coordinates = $2 
                tz = $3 
                comments = $4 
                if (cc < cc0) { 
                        printf "%s:%d: country code '%s' is out of order\n", \ 
                                zone_table, zone_NR, cc >>"/dev/stderr" 
                        status = 1 
                } 
                cc0 = cc 
                tztab[tz] = 1 
                tz2comments[tz] = comments 
                tz2NR[tz] = zone_NR 
                for (i in cca) { 
                    cc = cca[i] 
                    cctz = cc tz 
                    cctztab[cctz] = 1 
                    if (cc2name[cc]) { 
                        cc_used[cc]++ 
                    } else { 
                        printf "%s:%d: %s: unknown country code\n", \ 
                                zone_table, zone_NR, cc >>"/dev/stderr" 
                        status = 1 
                    } 
                } 
                if (coordinates !~ /^[-+][0-9][0-9][0-5][0-9][-+][01][0-9][0-9][0-5][0-9]$/ \ 
                    && coordinates !~ /^[-+][0-9][0-9][0-5][0-9][0-5][0-9][-+][01][0-9][0-9][0-5][0-9][0-5][0-9]$/) { 
                        printf "%s:%d: %s: invalid coordinates\n", \ 
                                zone_table, zone_NR, coordinates >>"/dev/stderr" 
                        status = 1 
                } 
        } 
 
        for (cctz in cctztab) { 
                cc = substr (cctz, 1, 2) 
                tz = substr (cctz, 3) 
                if (1 < cc_used[cc]) { 
                        comments_needed[tz] = cc 
                } 
        } 
        for (cctz in cctztab) { 
          cc = substr (cctz, 1, 2) 
          tz = substr (cctz, 3) 
          if (!comments_needed[tz] && tz2comments[tz]) { 
            printf "%s:%d: unnecessary comment '%s'\n", \ 
                zone_table, tz2NR[tz], tz2comments[tz] \ 
                >>"/dev/stderr" 
            tz2comments[tz] = 0 
            status = 1 
          } else if (comments_needed[tz] && !tz2comments[tz]) { 
            printf "%s:%d: missing comment for %s\n", \ 
              zone_table, tz2NR[tz], comments_needed[tz] \ 
              >>"/dev/stderr" 
            tz2comments[tz] = 1 
            status = 1 
          } 
        } 
        FS = " " 
} 
 
$1 ~ /^#/ { next } 
 
{ 
        tz = rules = "" 
        if ($1 == "Zone") { 
                tz = $2 
                ruleUsed[$4] = 1 
                if ($5 ~ /%/) rulePercentUsed[$4] = 1 
        } else if ($1 == "Link" && zone_table == "zone.tab") { 
                # Ignore Link commands if source and destination basenames 
                # are identical, e.g. Europe/Istanbul versus Asia/Istanbul. 
                src = $2 
                dst = $3 
                while ((i = index(src, "/"))) src = substr(src, i+1) 
                while ((i = index(dst, "/"))) dst = substr(dst, i+1) 
                if (src != dst) tz = $3 
        } else if ($1 == "Rule") { 
                ruleDefined[$2] = 1 
                if ($10 != "-") ruleLetters[$2] = 1 
        } else { 
                ruleUsed[$2] = 1 
                if ($3 ~ /%/) rulePercentUsed[$2] = 1 
        } 
        if (tz && tz ~ /\//) { 
                if (!tztab[tz]) { 
                        printf "%s: no data for '%s'\n", zone_table, tz \ 
                                >>"/dev/stderr" 
                        status = 1 
                } 
                zoneSeen[tz] = 1 
        } 
} 
 
END { 
        for (tz in ruleDefined) { 
                if (!ruleUsed[tz]) { 
                        printf "%s: Rule never used\n", tz 
                        status = 1 
                } 
        } 
        for (tz in ruleLetters) { 
                if (!rulePercentUsed[tz]) { 
                        printf "%s: Rule contains letters never used\n", tz 
                        status = 1 
                } 
        } 
        for (tz in tztab) { 
                if (!zoneSeen[tz]) { 
                        printf "%s:%d: no Zone table for '%s'\n", \ 
                                zone_table, tz2NR[tz], tz >>"/dev/stderr" 
                        status = 1 
                } 
        } 
        if (0 < want_warnings) { 
                for (cc in cc2name) { 
                        if (!cc_used[cc]) { 
                                printf "%s:%d: warning: " \ 
                                        "no Zone entries for %s (%s)\n", \ 
                                        iso_table, cc2NR[cc], cc, cc2name[cc] 
                        } 
                } 
        } 
 
        exit status 
}