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Posted By

Zufolek on 05/20/09


Tagged

isalpha


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isalpha

 / Published in: C
 

several versions of isalpha

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  1. inline const int isalpha2(char c){
  2.  return c>='a' && c<='z' || c>='A' && c<='Z';
  3. }
  4.  
  5.  
  6. inline const int isalpha3(unsigned char c){
  7.  return --c>>6==1 & (c&31)<26;
  8. }
  9.  
  10.  
  11. inline const int isalpha4(unsigned char c){
  12.  unsigned char out;
  13.  asm(
  14.   "\n"
  15.   "decb %1\n"
  16.   "movb %1,%0\n"
  17.   "shrb $6,%0\n"
  18.   "cmpb $1,%0\n"
  19.   "seteb %%al\n"
  20.   "andb $31,%1\n"
  21.   "cmpb $26,%1\n"
  22.   "setlb %%ah\n"
  23.   "cmpw $257,%%ax\n"
  24.   "seteb %0\n"
  25.   :"=q"(out)
  26.   :"q"(c)
  27.   :"ax"
  28.  );
  29.  return out;
  30. }

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