ref: 30d5a2c869c5f47cca98fdedb9024d462c6b9191
dir: /lib/c/setlocale.c/
#include <locale.h> #include <stddef.h> #undef setlocale char * setlocale(int category, const char *locale) { if (category > LC_TIME || category < LC_ALL) return NULL; if (!locale || locale[0] == '\0' || locale[0] == 'C' && locale[1] == '\0') { return "C"; } return NULL; }