1 #include <string.h>
2 
3 char* __strchrnul(const char*, int);
4 
strchr(const char * s,int c)5 char* strchr(const char* s, int c) {
6     char* r = __strchrnul(s, c);
7     return *(unsigned char*)r == (unsigned char)c ? r : 0;
8 }
9