HelenOS sources

os_chr_to_astr    180 uspace/app/sbi/src/os/helenos.c char *os_chr_to_astr(char32_t chr)
os_chr_to_astr    166 uspace/app/sbi/src/os/posix.c char *os_chr_to_astr(char32_t chr)
HelenOS homepage, sources at GitHub