ctype.h 1.5 KB

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  1. #ifndef _LINUX_CTYPE_H
  2. #define _LINUX_CTYPE_H
  3. /*
  4. * NOTE! This ctype does not handle EOF like the standard C
  5. * library is required to.
  6. */
  7. #define _U 0x01 /* upper */
  8. #define _L 0x02 /* lower */
  9. #define _D 0x04 /* digit */
  10. #define _C 0x08 /* cntrl */
  11. #define _P 0x10 /* punct */
  12. #define _S 0x20 /* white space (space/lf/tab) */
  13. #define _X 0x40 /* hex digit */
  14. #define _SP 0x80 /* hard space (0x20) */
  15. extern const unsigned char _ctype[];
  16. #define __ismask(x) (_ctype[(int)(unsigned char)(x)])
  17. #define isalnum(c) ((__ismask(c)&(_U|_L|_D)) != 0)
  18. #define isalpha(c) ((__ismask(c)&(_U|_L)) != 0)
  19. #define iscntrl(c) ((__ismask(c)&(_C)) != 0)
  20. #define isdigit(c) ((__ismask(c)&(_D)) != 0)
  21. #define isgraph(c) ((__ismask(c)&(_P|_U|_L|_D)) != 0)
  22. #define islower(c) ((__ismask(c)&(_L)) != 0)
  23. #define isprint(c) ((__ismask(c)&(_P|_U|_L|_D|_SP)) != 0)
  24. #define ispunct(c) ((__ismask(c)&(_P)) != 0)
  25. #define isspace(c) ((__ismask(c)&(_S)) != 0)
  26. #define isupper(c) ((__ismask(c)&(_U)) != 0)
  27. #define isxdigit(c) ((__ismask(c)&(_D|_X)) != 0)
  28. /*
  29. * Rather than doubling the size of the _ctype lookup table to hold a 'blank'
  30. * flag, just check for space or tab.
  31. */
  32. #define isblank(c) (c == ' ' || c == '\t')
  33. #define isascii(c) (((unsigned char)(c))<=0x7f)
  34. #define toascii(c) (((unsigned char)(c))&0x7f)
  35. static inline unsigned char __tolower(unsigned char c)
  36. {
  37. if (isupper(c))
  38. c -= 'A'-'a';
  39. return c;
  40. }
  41. static inline unsigned char __toupper(unsigned char c)
  42. {
  43. if (islower(c))
  44. c -= 'a'-'A';
  45. return c;
  46. }
  47. #define tolower(c) __tolower(c)
  48. #define toupper(c) __toupper(c)
  49. #endif