本文主要是介绍ap_ctype.h，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
该文件定义了用于兼容8位字符的系统。
#ifndef AP_CTYPE_H
#define AP_CTYPE_H
#include <ctype.h>
#ifdef __cplusplus
extern "C" {
#endif
/* These macros allow correct support of 8-bit characters on systems which
* support 8-bit characters. Pretty dumb how the cast is required, but
* that's legacy libc for ya. These new macros do not support EOF like
* the standard macros do. Tough.
*/
#define ap_isalnum(c) (isalnum(((unsigned char)(c))))
#define ap_isalpha(c) (isalpha(((unsigned char)(c))))
#define ap_iscntrl(c) (iscntrl(((unsigned char)(c))))
#define ap_isdigit(c) (isdigit(((unsigned char)(c))))
#define ap_isgraph(c) (isgraph(((unsigned char)(c))))
#define ap_islower(c) (islower(((unsigned char)(c))))
#define ap_isprint(c) (isprint(((unsigned char)(c))))
#define ap_ispunct(c) (ispunct(((unsigned char)(c))))
#define ap_isspace(c) (isspace(((unsigned char)(c))))
#define ap_isupper(c) (isupper(((unsigned char)(c))))
#define ap_tolower(c) (tolower(((unsigned char)(c))))
#define ap_toupper(c) (toupper(((unsigned char)(c))))
#ifdef __cplusplus
}
#endif
#endif /* !AP_CTYPE_H */
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