对于INTEGERS，CHARACTERS，c中是否有任何GENRIC MACROS？

问题描述

我想使用

string.h头文件中的strrchar（source_string，last_char）函数来查找最后一次出现的非空格

字母数字字符。


然后我会在递增该位置后放置一个NULL CHAR，并通过strrchar（）函数收到

。


这是我从右边修剪一个字符串的想法。


根据strrchar函数的定义，我应该为

提供字符串并且该字符必须在最后一次出现时检查

。但我想设置一种方法来检查GENRIC ALPHANUMERIC CHARACTER的最后一次出现

，而不是任何

特定字符。


我们在C中有任何GENERIC预定义宏，用于

INTEGERS，CHARACTERS .. .etc。


是否有更好更快的解决方案正确修剪大字符串

？


谢谢提前。


Reg ards，

shamdurgs

解决方案

使用我的...


char * rtrim（char * str）{

char * s，* p; int c;

s = p = str;

while（（c = * s ++））if（！isspace（c））p = s;

* p =''\ 0'';

返回str;

}


-

Joe Wright mailto：jo ******** @ comcast.net

所有内容都应尽可能简单，但并不简单。

--- Albert Einstein ---

实际上，就像< ctype.h>中原型的所有函数一样，isalnum

需要一个int ，而不是char。


标准说：


4.3.1.1 isalnum功能


概要


#include< ctype.h>

int isalnum（int c）;


描述


isalnum函数测试任何字符为isalpha或

isdigit为真。

I want to use strrchar(source_string,last_char ) function from
string.h header file,to find out the last occurrence of the NON SPACE
Alphanumeric Character.

Then i will put a NULL CHAR after incrementing that position,received
by strrchar() function by 1.

This is my idea of Trimming a string from right .

According to the definition of the strrchar function,i am supposed to
provide the string and that character that has to be checked for the
last occurrence.But i want to device a way to check the last
occurrence of a "GENRIC ALPHANUMERIC CHARACTER",rather than any
specific character.

Have we got any GENERIC Predefined Macro in C ,for
INTEGERS,CHARACTERS...etc.

Is there any better and fast solution for Right Trimming a Big string
?

Thanks in Advance.

Regards,
shamdurgs

解决方案

Use mine ..

char * rtrim(char *str) {
char *s, *p; int c;
s = p = str;
while ((c = *s++)) if (!isspace(c)) p = s;
*p = ''\0'';
return str;
}

--
Joe Wright mailto:jo********@comcast.net
"Everything should be made as simple as possible, but not simpler."
--- Albert Einstein ---

Actually, like all the functions prototyped in <ctype.h>, isalnum
takes an int, not a char.

The Standard says:

4.3.1.1 The isalnum function

Synopsis

#include <ctype.h>
int isalnum(int c);

Description

The isalnum function tests for any character for which isalpha or
isdigit is true.

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