str_replace字符串替换

字符串替换， src 源字符串， buf_size 缓冲大小， search搜索的字符串大小， repstr 需要替换成的字符串

int str_replace(char *src, unsigned int buf_size, char* search, char *repstr)
{
	if(!src ||  !search || !repstr|| buf_size < 0)
	{
		return -1;
	}

	const unsigned int size = buf_size + 1024 ;

	char * temp = (char *)malloc(size);
	memset(temp, 0x00, size);

	char * src_pos = src;
	char * result = src;
	char * dst_pos = temp;

	unsigned int length = 0;
	
	int search_len = strlen(search);
	int rep_len = strlen(repstr);

	do
	{
		src_pos = strstr(src_pos, search);

		if(!src_pos)
		{
			strcpy(dst_pos, result);
			length += search_len;
			break;
		}

		strncpy(dst_pos, result, src_pos - result);
		dst_pos += src_pos - result;

		//replace
		strcat(dst_pos, repstr);
		dst_pos += rep_len;
		length +=  src_pos - result + rep_len;

		src_pos += search_len;
		result = src_pos;
	}
	while(src_pos);

	if(length >= buf_size)
	{
		free(temp);
		temp = NULL;
		
		return -1;
	}
	else
	{
		_snprintf_c(src,buf_size,"%s", temp);
		free(temp);
		temp = NULL;

		return 0;
	}
}


int main(void)
{

	char buf[512] ={"123%4235%%6723"};
	printf("%s\n", buf);
	str_replace(buf,512,"%","love");
	printf("%s\n", buf);

	return 0;
}

结果输出：

123%4235%%6723
123love4235lovelove6723