编写一个业务函数，实现按行读取文件。把内容按照第三种内存模型打包数据传出，把行数通过函数参数传出。

编写一个业务函数，实现按行读取文件。把内容按照第三种内存模型打包数据传出，把行数通过函数参数传出。

函数原型有两个，任意选择其一

要求1：请自己任意选择一个接口（函数），并实现功能；70分

要求2：编写测试用例。30分

要求3：自己编写内存释放函数

*/

char **readFile1(const char *pfilename/*in*/, int *lineNum/*in out*/);

int readFile2(const char *pfilename/*in*/, char ***p/*out*/, int *lineNum/*int out*/);

#define _CRT_SECURE_NO_WARNINGS

#include<stdio.h>

#include<stdlib.h>

#include<string.h>

char **readFile1(const char *pfilename/*in*/, int *lineNum/*in out*/);

int readFile2(const char *pfilename/*in*/, char ***p/*out*/);

char **readFile1(const char *pfilename/*in*/, int *lineNum/*in out*/)

{

int rv = 0;

FILE *fp = NULL;

char lineBuf[1024 * 4];

char **pTmp = NULL;

char *p = NULL;

int tmpLine = 0, strLine = 0, i = 0;

if (pfilename == NULL || lineNum == NULL)

{

rv = -1;

printf("readFile1() err. param err \n");

goto End;

}

fp = fopen(pfilename, "r");

if (fp == NULL)

{

rv = -2;

printf("fopen() err. \n");

goto End;

}

while(!feof(fp))

{

memset(lineBuf, 0, sizeof(lineBuf));

p = fgets(lineBuf, 1024 * 4, fp);

if (p == NULL)

{

break;

}

else

{

tmpLine++;

}

}

pTmp = (char **)malloc(tmpLine * sizeof(char *));

if (pTmp == NULL)

{

rv = -2;

printf("malloc() err. \n");

goto End;

}

//让文件指针指向文件的开头，目的：第二次从头检索

fseek(fp, 0L, SEEK_SET);

i = 0;

while (!feof(fp))

{

//读每一行

memset(lineBuf, 0, sizeof(lineBuf));

p = fgets(lineBuf, 1024 * 4, fp);

if (p == NULL)

{

break;

}

strLine = strlen(lineBuf);

pTmp[i] = (char *)malloc((strLine + 1) * sizeof(char));

if (pTmp[i] == NULL)

{

rv = -3;

printf("malloc() err. \n");

goto End;

}

strcpy(pTmp[i], lineBuf);

i++;

}

End:

if (fp != NULL)

{

fclose(fp);

}

//赋值

*lineNum = tmpLine;

return pTmp;

}

void FreeMypp(char **p, int linenum)

{

int i = 0;

if (p == NULL)

{

return NULL;

}

for (i = 0; i<linenum; i++)

{

if (p[i] != NULL)

{

free(p[i]);

}

}

free(p);

return;

}

int readFile2(const char *pfilename/*in*/, char ***myfileP/*in out*/)

{

int rv = 0;

FILE *fp = NULL;

char lineBuf[1024 * 4];

char **pTmp = NULL;

char *p = NULL;

int tmpLine = 0, strLine = 0, i = 0;

if (pfilename == NULL || myfileP == NULL)

{

rv = -1;

printf("readFile1() err. param err \n");

goto End;

}

fp = fopen(pfilename, "r");

if (fp == NULL)

{

rv = -2;

printf("fopen() err. \n");

goto End;

}

//第一遍 读取文件有多少行

while (!feof(fp))

{

//读每一行

memset(lineBuf, 0, sizeof(lineBuf));

p = fgets(lineBuf, 1024 * 4, fp);

if (p == NULL)

{

break;

}

else

{

tmpLine++;

}

}

pTmp = (char **)malloc((tmpLine + 1) * sizeof(char *));

if (pTmp == NULL)

{

rv = -2;

printf("malloc() err. \n");

goto End;

}

memset(pTmp, 0, (tmpLine + 1) * sizeof(char *));

//让文件指针指向文件的开头，目的：第二次从头检索

fseek(fp, 0L, SEEK_SET);

//

i = 0;

while (!feof(fp))

{

//读每一行

memset(lineBuf, 0, sizeof(lineBuf));

p = fgets(lineBuf, 1024 * 4, fp);

if (p == NULL)

{

break;

}

strLine = strlen(lineBuf);

pTmp[i] = (char *)malloc((strLine + 1) * sizeof(char));

if (pTmp[i] == NULL)

{

rv = -3;

printf("malloc() err. \n");

goto End;

}

strcpy(pTmp[i], lineBuf);

i++;

}

End:

if (fp != NULL)

{

fclose(fp);

}

//赋值

//*lineNum = tmpLine;

*myfileP = pTmp;

return rv;

}

void FreeMypp3(char **p)

{

int i = 0;

if (p == NULL)

{

return NULL;

}

for (i = 0; p[i] != NULL; i++)

{

if (p[i] != NULL)

{

free(p[i]);

}

}

free(p);

return;

}

void main01()

{

int ret = 0;

int linenum = 0;

const char *pfilename = "D:\\test\\a.txt";

char **p = NULL;

int i = 0;

p = readFile1(pfilename/*in*/, &linenum/*in out*/);

if (p == NULL)

{

ret = -1;

printf("func err readFile1(pfilename/*in*/, &linenum/*in out*/); err :%d\n",ret);

}

for (i = 0; i<linenum; i++)

{

printf("%s\n", p[i]);

}

FreeMypp(p, linenum);

system("pause");

}

void main()

{

int ret = 0;

int linenum = 0;

const char *pfilename = "D:\\test\\a.txt";

char **p = NULL;

int i = 0;

ret = readFile2(pfilename/*in*/, &p/*out*/);

if (ret != 0)

{

return;

}

for (i = 0; p[i] != NULL; i++)

{

printf("%s\n", p[i]);

}

FreeMypp3(p);

system("pause");

}