gv_ctype.h

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#pragma once
 
#include <stdbool.h>
 
static inline bool gv_islower(int c) { return c >= 'a' && c <= 'z'; }
 
static inline bool gv_isupper(int c) { return c >= 'A' && c <= 'Z'; }
 
static inline bool gv_isalpha(int c) { return gv_islower(c) || gv_isupper(c); }
 
static inline bool gv_isblank(int c) { return c == ' ' || c == '\t'; };
 
static inline bool gv_iscntrl(int c) {
  if (c >= 0 && c <= 31)
    return true;
  if (c == 127)
    return true;
  return false;
}
 
static inline bool gv_isdigit(int c) { return c >= '0' && c <= '9'; }
 
static inline bool gv_isalnum(int c) { return gv_isalpha(c) || gv_isdigit(c); }
 
static inline bool gv_isgraph(int c) { return c > 32 && c < 127; }
 
static inline bool gv_isprint(int c) { return c > 31 && c < 127; }
 
static inline bool gv_ispunct(int c) {
  if (gv_isalnum(c))
    return false;
  return c > 32 && c < 127;
}
 
static inline bool gv_isspace(int c) {
  if (c == '\t')
    return true;
  if (c == '\n')
    return true;
  if (c == '\v')
    return true;
  if (c == '\f')
    return true;
  if (c == '\r')
    return true;
  if (c == ' ')
    return true;
  return false;
}
 
static inline bool gv_isxdigit(int c) {
  if (gv_isdigit(c))
    return true;
  if (c >= 'A' && c <= 'F')
    return true;
  if (c >= 'a' && c <= 'f')
    return true;
  return false;
}
 
static inline char gv_tolower(int c) {
  if (gv_isupper(c))
    return (char)c - 'A' + 'a';
  return (char)c;
}
 
static inline void gv_tolower_str(char *s) {
  for (; *s != '\0'; ++s) {
    *s = gv_tolower(*s);
  }
}
 
static inline char gv_toupper(int c) {
  if (gv_islower(c))
    return (char)c - 'a' + 'A';
  return (char)c;
}
 
static inline void gv_toupper_str(char *s) {
  for (; *s != '\0'; ++s) {
    *s = gv_toupper(*s);
  }
}