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【C】 C字符串函数

作者:Dezai.CN / 发布于2013/7/13/ 845


	#include <string.h>
	#include <stdlib.h>

	void remchars(char *str, char c);
	void remcnks(char *str, char *cnk);
	void replchars(char *str, char c1, char c2);
	void replcnks(char *str, char *cnk1, char *cnk2);
	void reverse(char *str);

	//remove specified characters from a string
	void remchars(char *str, char c)
	{
	 char *pos;
	 while(pos = strchr(str,c))
	 memmove(pos, pos + 1, strlen(pos));
	}

	//remove specified chunks from a string
	void remcnks(char *str, char *cnk)
	{
	 char *pos;
	 int clen = strlen(cnk);
	 while(pos = strstr(str, cnk))
	 memmove(pos, pos + clen, strlen(pos) - clen + 1);
	}

	//replace specified characters in a string
	void replchars(char *str, char c1, char c2)
	{
	 char *pos;
	 while(pos = strchr(str, c1))
	 *pos = c2;
	}

	//replace specified chunks in a string (size-independent, just remember about memory)
	void replcnks(char *str, char *cnk1, char *cnk2)
	{
	 char *pos;
	 int clen1 = strlen(cnk1), clen2 = strlen(cnk2);
	 while(pos = strstr(str, cnk1))
	 {
	 memmove(pos + clen2, pos + clen1, strlen(pos) - clen1 + 1);
	 memcpy(pos, cnk2, clen2);
	 }
	}

	//reverse a string
	void reverse(char *str)
	{
	 int i;
	 int len = strlen(str) - 1;
	 int mid = (len % 2) ? (len / 2) : ((len + 1) / 2);
	 for(i = 0; i <= mid; ++i)
	 {
	 char buf = str[i];
	 str[i] = str[len - i];
	 str[len - i] = buf;
	 }
	}

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