https://www.systutorials.com/docs/linux/man/docs/linux/man/3p-wcswcs/
wcswcs: find a wide substring (LEGACY) - Linux Manuals (3p)
The wcswcs() function shall locate the first occurrence in the wide-character string pointed to by ws1 of the sequence of wide-character codes (excluding the...
find alinux manualswidesubstringlegacy