/usr/share/et/et_c.awk is in comerr-dev 2.1-1.44.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 | BEGIN { 
if ( length(outfn) == 0) {
	outfn = outfile
}
char_shift=64
## "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_";
c2n["A"]=1
c2n["B"]=2
c2n["C"]=3
c2n["D"]=4
c2n["E"]=5
c2n["F"]=6
c2n["G"]=7
c2n["H"]=8
c2n["I"]=9
c2n["J"]=10
c2n["K"]=11
c2n["L"]=12
c2n["M"]=13
c2n["N"]=14
c2n["O"]=15
c2n["P"]=16
c2n["Q"]=17
c2n["R"]=18
c2n["S"]=19
c2n["T"]=20
c2n["U"]=21
c2n["V"]=22
c2n["W"]=23
c2n["X"]=24
c2n["Y"]=25
c2n["Z"]=26
c2n["a"]=27
c2n["b"]=28
c2n["c"]=29
c2n["d"]=30
c2n["e"]=31
c2n["f"]=32
c2n["g"]=33
c2n["h"]=34
c2n["i"]=35
c2n["j"]=36
c2n["k"]=37
c2n["l"]=38
c2n["m"]=39
c2n["n"]=40
c2n["o"]=41
c2n["p"]=42
c2n["q"]=43
c2n["r"]=44
c2n["s"]=45
c2n["t"]=46
c2n["u"]=47
c2n["v"]=48
c2n["w"]=49
c2n["x"]=50
c2n["y"]=51
c2n["z"]=52
c2n["0"]=53
c2n["1"]=54
c2n["2"]=55
c2n["3"]=56
c2n["4"]=57
c2n["5"]=58
c2n["6"]=59
c2n["7"]=60
c2n["8"]=61
c2n["9"]=62
c2n["_"]=63
}
/^#/ { next }
/^[ \t]*(error_table|et)[ \t]+[a-zA-Z][a-zA-Z0-9_]+/ {
	table_number = 0
	mod_base = 1000000
	if (NF > 2) {
	    table_name = $3
	    base_name = $2
	} else {
	    table_name = $2
	    base_name = table_name
	}
	for(i=1; i<=length(base_name); i++) {
	    table_number=(table_number*char_shift)+c2n[substr(base_name,i,1)]
	}
	# We start playing *_high, *low games here because the some
	# awk programs do not have the necessary precision (sigh)
	tab_base_low = table_number % mod_base
	if (tab_base_low < 0) {
		# Work around stupid bug in the ARM libm
		tab_base_low = tab_base_low + mod_base
	}
	tab_base_high = int(table_number / mod_base)
	tab_base_sign = 1;
	# figure out: table_number_base=table_number*256
	tab_base_low = tab_base_low * 256
	tab_base_high = (tab_base_high * 256) + \
			int(tab_base_low / mod_base)
	tab_base_low = tab_base_low % mod_base
	if (tab_base_low < 0) {
		# Work around stupid bug in the ARM libm
		tab_base_low = tab_base_low + mod_base
	}
	if (table_number > 128*256*256) {
		# figure out:  table_number_base -= 256*256*256*256
		# sub_high, sub_low is 256*256*256*256
		sub_low = 256*256*256 % mod_base
		sub_high = int(256*256*256 / mod_base)
		sub_low = sub_low * 256
		sub_high = (sub_high * 256) + int(sub_low / mod_base)
		sub_low = sub_low % mod_base
		tab_base_low = sub_low - tab_base_low;
		tab_base_high = sub_high - tab_base_high;
		tab_base_sign = -1;
		if (tab_base_low < 0) {
			tab_base_low = tab_base_low + mod_base
			tab_base_high--
		}
	}
	print "/*" > outfile
	print " * " outfn ":" > outfile
	print " * This file is automatically generated; please do not edit it." > outfile
	print " */" > outfile
	print "" > outfile
	print "#include <stdlib.h>" > outfile
	print "" > outfile
	print "#define N_(a) a" > outfile
	print "" > outfile
	print "static const char * const text[] = {" > outfile
	table_item_count = 0
}
(continuation == 1) && ($0 ~ /\\[ \t]*$/) {
	text=substr($0,1,length($0)-1);
#	printf "\t\t\"%s\"\n", text > outfile
	cont_buf=cont_buf text;
}
(continuation == 1) && ($0 ~ /"[ \t]*$/) {
#	printf "\t\t\"%s,\n", $0 > outfile
	printf "\tN_(%s),\n", cont_buf $0 > outfile
	continuation = 0;
}
/^[ \t]*(error_code|ec)[ \t]+[A-Z_0-9]+,[^ \t]/ {
	# Be tolerant to missing whitespace after `,' ...
	sub(/,/, ", ")
}
/^[ \t]*(error_code|ec)[ \t]+[A-Z_0-9]+,[ \t]*$/ {
	table_item_count++
	skipone=1
	next
}
/^[ \t]*(error_code|ec)[ \t]+[A-Z_0-9]+,[ \t]*".*"[ \t]*$/ {
	text=""
	for (i=3; i<=NF; i++) { 
	    text = text FS $i
	}
	text=substr(text,2,length(text)-1);
	printf "\tN_(%s),\n", text > outfile
	table_item_count++
}
/^[ \t]*(error_code|ec)[ \t]+[A-Z_0-9]+,[ \t]*".*\\[ \t]*$/ {
	text=""
	for (i=3; i<=NF; i++) { 
	    text = text FS $i
	}
	text=substr(text,2,length(text)-2);
#	printf "\t%s\"\n", text > outfile
	cont_buf=text
	table_item_count++
	continuation++;
}
/^[ \t]*".*\\[ \t]*$/ {
	if (skipone) {
	    text=substr($0,1,length($0)-1);
#	    printf "\t%s\"\n", text > outfile
	    cont_buf=text
	    continuation++;
	}
	skipone=0
}
{ 
	if (skipone) {
	    printf "\tN_(%s),\n", $0 > outfile
	}
	skipone=0
}
/^[ \t]*(prefix)$/ {
	prefix_str = ""
}
/^[ \t]*(prefix)[ \t]+[A-Z_0-9]+/ {
	prefix_str = $2 "_"
}
/^[ \t]*(index)[ \t]+[A-Z_0-9]+/ {
	new_idx = $2
	for (i = table_item_count ; i < new_idx; i++) {
		printf "\tN_(\"Reserved %s error (%d)\"),\n", \
			table_name, table_item_count++ > outfile
	}
}
END {
	print "    0" > outfile
	print "};" > outfile
	print "" > outfile
	print "struct error_table {" > outfile
	print "    char const * const * msgs;" > outfile
	print "    long base;" > outfile
	print "    int n_msgs;" > outfile
	print "};" > outfile
	print "struct et_list {" > outfile
	print "    struct et_list *next;" > outfile
	print "    const struct error_table * table;" > outfile
	print "};" > outfile
	print "extern struct et_list *_et_list;" > outfile
	print "" > outfile
	if (tab_base_high == 0) {
		print "const struct error_table et_" table_name "_error_table = { text, " \
		sprintf("%dL, %d };", tab_base_sign*tab_base_low, \
		table_item_count) > outfile
	} else {
		print "const struct error_table et_" table_name "_error_table = { text, " \
		sprintf("%d%06dL, %d };", tab_base_sign*tab_base_high, \
		tab_base_low, table_item_count) > outfile
	}
	print "" > outfile
	print "static struct et_list link = { 0, 0 };" > outfile
	print "" > outfile
	print "void initialize_" table_name "_error_table_r(struct et_list **list);" > outfile
	print "void initialize_" table_name "_error_table(void);" > outfile
	print "" > outfile
	print "void initialize_" table_name "_error_table(void) {" > outfile
	print "    initialize_" table_name "_error_table_r(&_et_list);" > outfile
	print "}" > outfile
	print "" > outfile
	print "/* For Heimdal compatibility */" > outfile
	print "void initialize_" table_name "_error_table_r(struct et_list **list)" > outfile
	print "{" > outfile
	print "    struct et_list *et, **end;" > outfile
	print "" > outfile
	print "    for (end = list, et = *list; et; end = &et->next, et = et->next)" > outfile
	print "        if (et->table->msgs == text)" > outfile
	print "            return;" > outfile
	print "    et = malloc(sizeof(struct et_list));" > outfile
	print "    if (et == 0) {" > outfile
	print "        if (!link.table)" > outfile
	print "            et = &link;" > outfile
	print "        else" > outfile
	print "            return;" > outfile
	print "    }" > outfile
	print "    et->table = &et_" table_name "_error_table;" > outfile
	print "    et->next = 0;" > outfile
	print "    *end = et;" > outfile
	print "}" > outfile
}
 |