手动打造内存空间——多级指针应用分隔字符串20200219

代码如下： 

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

void FreeMallocMem(char** pt3, int nCount)
{
	int i = 0;
	if (pt3 == NULL)
	{
		return;
	}
	for (i = 0; i < nCount; i++)
	{
		if (pt3[i] != NULL)//已经分配内存了
		{
			free(pt3[i]);
		}
	}
	if (pt3 != NULL)
	{
		free(pt3);
	}
}

void FreeMallocMem1(char*** pt4, int nCount)
{
	int i = 0;
	char** pt3 = NULL;
	if (pt4 == NULL)
	{
		return;
	}
	pt3 = *pt4;
	if (pt3 == NULL)
	{
		return;
	}
	for (i = 0; i < nCount; i++)
	{
		if (pt3[i] != NULL)//已经分配内存了
		{
			free(pt3[i]);
		}
	}
	if (pt3 != NULL)
	{
		free(pt3);
	}
	*pt4 = NULL;//把实参二级指针，修改成NULL
}

int Split_string(char* instr, char c, char*** p3, int* nrow)
{
	int ret = 0;
	int i = 0;
	int nCount = 0;
	if (instr == NULL)
	{
		ret = -1;
		printf("instr NULL error:%d\n", ret);
		/*return ret;*/
		goto END;
	}
	char* pt1 = instr;
	char* pt2 = instr;
	char** pt3 = NULL;
	//nCount
	do
	{
		pt1 = strchr(pt1, c);
		if (pt1 != NULL)
		{
			if (pt1 - pt2 > 0)
			{
				nCount++;
				pt1 = pt1 + 1;
				pt2 = pt1;
			}
			else
			{
				ret = -5;
				printf("instr error:%d\n", ret);
				/*return ret;*/
				goto END;
			}
		}
		else
		{
			ret = -6;
			printf("NO ',' error:%d\n", ret);
			/*return ret;*/
			goto END;
		}
	} while (*pt1 != '\0');
	*nrow = nCount;
	//
	nCount = 0;
	pt1 = instr;
	pt2 = instr;
	pt3 = (char**)malloc(nCount * sizeof(char*));//char* Array[nCount]
	if (pt3 == NULL)
	{
		ret = -1;
		printf("pt3 malloc error:%d\n", ret);
		/*return ret;*/
		goto END;
	}
	memset(pt3, 0, nCount * sizeof(char*));
	//copy data
	do
	{
		pt1 = strchr(pt1, c);
		if (pt1 != NULL)
		{
			if (pt1 - pt2 > 0)
			{
				int len = pt1 - pt2;
				int strlen = pt1 - pt2 + 1;
				pt3[nCount] = (char*)malloc(strlen * sizeof(char));
				if (pt3[nCount] == NULL)
				{
					ret = -2;
					printf("pt3[nCount] malloc error:%d\n", ret);
					/*return ret;*/
					goto END;
				}
				strncpy(pt3[nCount], pt2, len);
				pt3[nCount][len] = '\0';
				nCount++;
				pt1 = pt1 + 1;
				pt2 = pt1;
			}
			else
			{
				ret = -5;
				printf("instr error:%d\n", ret);
				/*return ret;*/
				goto END;
			}
		}
		else
		{
			ret = -6;
			printf("NO ',' error:%d\n", ret);
			/*return ret;*/
			goto END;
		}
	} while (*pt1 != '\0');
END:
	if (ret != 0)//失败
	{
		/*
		if (pt3 == NULL)
		{
			return ret;
		}
		for (i = 0; i < nCount; i++)
		{
			if (pt3[i] != NULL)//已经分配内存了
			{
				free(pt3[i]);
			}
		}
		if (pt3 != NULL)
		{
			free(pt3);
		}*/
		FreeMallocMem1(&pt3, nCount);
	}
	else
	{
		*p3 = pt3;
	}
	return ret;
}

void printArray1(char** p2, int num)
{
	int i = 0;
	for (i = 0; i < num; i++)
	{
		printf("%s\n", p2[i]);
	}
}

int main()
{
	int ret = 0;
	char* str = "ab,co,12ad,error,good,";
	int rows = 0;
	char c = ',';
	char** pt = NULL;
	ret = Split_string(str, c, &pt, &rows);
	if (ret != 0)
	{
		printf("func Split_string() error:%d\n", ret);
		return ret;
	}
	//print
	printArray1(pt, rows);

	system("pause");
	return 0;
}