ctype.h 1.7 KB

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  1. /* SPDX-License-Identifier: GPL-2.0 */
  2. #ifndef _LINUX_CTYPE_H
  3. #define _LINUX_CTYPE_H
  4. /*
  5. * NOTE! This ctype does not handle EOF like the standard C
  6. * library is required to.
  7. */
  8. #define _U 0x01 /* upper */
  9. #define _L 0x02 /* lower */
  10. #define _D 0x04 /* digit */
  11. #define _C 0x08 /* cntrl */
  12. #define _P 0x10 /* punct */
  13. #define _S 0x20 /* white space (space/lf/tab) */
  14. #define _X 0x40 /* hex digit */
  15. #define _SP 0x80 /* hard space (0x20) */
  16. extern const unsigned char _ctype[];
  17. #define __ismask(x) (_ctype[(int)(unsigned char)(x)])
  18. #define isalnum(c) ((__ismask(c)&(_U|_L|_D)) != 0)
  19. #define isalpha(c) ((__ismask(c)&(_U|_L)) != 0)
  20. #define iscntrl(c) ((__ismask(c)&(_C)) != 0)
  21. static inline int isdigit(int c)
  22. {
  23. return '0' <= c && c <= '9';
  24. }
  25. #define isgraph(c) ((__ismask(c)&(_P|_U|_L|_D)) != 0)
  26. #define islower(c) ((__ismask(c)&(_L)) != 0)
  27. #define isprint(c) ((__ismask(c)&(_P|_U|_L|_D|_SP)) != 0)
  28. #define ispunct(c) ((__ismask(c)&(_P)) != 0)
  29. /* Note: isspace() must return false for %NUL-terminator */
  30. #define isspace(c) ((__ismask(c)&(_S)) != 0)
  31. #define isupper(c) ((__ismask(c)&(_U)) != 0)
  32. #define isxdigit(c) ((__ismask(c)&(_D|_X)) != 0)
  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. /*
  50. * Fast implementation of tolower() for internal usage. Do not use in your
  51. * code.
  52. */
  53. static inline char _tolower(const char c)
  54. {
  55. return c | 0x20;
  56. }
  57. /* Fast check for octal digit */
  58. static inline int isodigit(const char c)
  59. {
  60. return c >= '0' && c <= '7';
  61. }
  62. #endif