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+#!/bin/sh
+
+# Parsing CSV files with sed
+
+# we convert csv files into a simplified interchange format:
+# text characters separated by tabs! we escape tabs, newlines, and backslashes
+# into \t, \n, and \\.
+
+# these functions process on standard input and standard output.
+# we allow CR LFs in input but we don't output them by default.
+
+# see csv.sh for an unminified version.
+
+# made by Natalia Posting in 2023
+
+from_csv () {
+	LC_ALL=C sed -n 's/'"$(printf "\r")"'$//;s/\\/\\\\/g;s/'"$(printf "\t")"'/\\t/g;H;x;h;s/^\n//;s/\n/\\n/g;s/,/,,/g;s/$/,/;s/^/,/;s/,\([^",]*\("[^"]*\(""[^"]*\)*"[^",]*\)*\),/\1'"$(printf "\t")"'/g;/,$/d;s/.$//;s/,,/,/g;s/"\([^"]*\(""[^"]*\)*\)"/\1/g;s/""/"/g;p;s/.*//;h'
+}
+
+
+to_csv () {
+	LC_ALL=C sed 's/"/""/g;s/'"$(printf "\t")"'/","/g;s/^/"/;s/$/"/;s/\\\\/& /g;s/\\n/\n/g;s/\\t/'"$(printf "\t")"'/g;s/\\\\ /\\/g;'
+}