1 #include <ctype.h> 2 #undef isalpha 3 isalpha(int c)4 int isalpha(int c) 5 { 6 return ((unsigned)c|32)-'a' < 26; 7 } 8 __isalpha_l(int c,locale_t l)9 int __isalpha_l(int c, locale_t l) 10 { 11 return isalpha(c); 12 } 13 14 weak_alias(__isalpha_l, isalpha_l); 15