#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int trimstr(char* dst,char *src)
{
	char* from = src;
	char* to = dst;
	 
	if (dst == NULL || src == NULL)
	{
		return -1;
	}
	int begin = 0;
	int end = strlen(from) - 1;
	while (from[begin]==' '&& from[begin]!=0)
	{
		begin++;
	}
	while (from[end] == ' '&& from[end] != 0)
	{
		end--;
	}
	int count = end - begin + 1;
	src = src + begin;
	strncpy(dst, src, count);
	dst[count] = '\0';
	return 0;
}

int trimstr2(char* dst, char *src)
{
	char* from = src;
	char* to = dst;
	int i = 0;
	int j = 0;
	if (dst == NULL || src == NULL)
	{
		return -1;
	}
	int begin = 0;
	int end = strlen(from) - 1;
	while (from[begin] == ' '&& from[begin] != 0)
	{
		begin++;
	}
	while (from[end] == ' '&& from[end] != 0)
	{
		end--;
	}
	int count = end - begin + 1;
	 
	printf("src=%s", src);
	for ( i = 0,j=begin; i < count,j<=end; i++,j++)
	{
		dst[i] = src[j];
	}
	dst[count] = '\0';
	return 0;
}

char * trim2ends(char* src){
	char *dst = (char*)malloc(100);
	int count = 0;
	if (src != NULL)
	{
		char * from = src;
		int begin = 0;
		int end = strlen(from) - 1;
		while (from[begin] == ' '&& from[begin] != 0)
		{
			begin++;
		}
		while (from[end] == ' '&& from[end] != 0)
		{
			end--;
		}
		 count = end - begin + 1;
		
		src = src + begin;
		strncpy(dst, src, count);
	}

	dst[count] = 0;
	return dst;
}
int main(int argc, char const *argv[])
{
	char* p = "        i love sexy girls   ";
	//char dst[100];
	char *result;
	//trimstr2(dst,p);
	result = trim2ends(p);
	printf("result=%s\n", result);
	system("pause");
	return 0;
}