sk_ctype.c

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#include "sk_ctype.h"
 
#ifdef __cplusplus
extern "C" {
#endif
 
int isalnum(int c) { return (isalpha(c) || isdigit(c)); }
 
int isalpha(int c) { return (islower(c) || isupper(c)); }
 
int isblank(int c) { return (c == ' ' || c == '\t'); }
 
int iscntrl(int c) { return ((c >= 0 && c <= 31) || c == 127); }
 
int isdigit(int c) { return (c >= '0' && c <= '9'); }
 
int isgraph(int c) { return (c >= 33 && c <= 126); }
 
int islower(int c) { return (c >= 'a' && c <= 'z'); }
 
int isprint(int c) { return (c >= 32 && c <= 126); }
 
int ispunct(int c) { return (isgraph(c) && !isalnum(c)); }
 
int isspace(int c) {
  return (c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t' ||
          c == '\v');
}
 
int isupper(int c) { return (c >= 'A' && c <= 'Z'); }
 
int isxdigit(int c) {
  return (isdigit(c) || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F'));
}
 
int tolower(int c) {
  if (isupper(c)) {
    return c + ('a' - 'A');
  }
  return c;
}
 
int toupper(int c) {
  if (islower(c)) {
    return c - ('a' - 'A');
  }
  return c;
}
 
#ifdef __cplusplus
}
#endif