DOKK / manpages / debian 10 / libowfat-dev / str_chr.3.en
str_chr(3) Library Functions Manual str_chr(3)

str_chr - find character in ASCIIZ string

#include <str.h>

size_t str_chr(const char* haystack,char needle);

str_chr returns the index of the first occurrance of needle or \0 in string.

strchr(3)