c语言 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

/*

2 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

*/

#include "stdlib.h"
#include "stdio.h"
#include "string.h"

#define  LineMaxLen 1024*2
//需要求出多少行，按照行分配内存
//在按行读文件，第二次分配内存，把结果copy到第二次分配的内存中

char **readFile1(const char *pfilename/*in*/, int *lineNum/*in out*/)
{
int		rv = 0, tmplineNum = 0;
FILE	*fp = NULL;
char	lineBuf[LineMaxLen];
char	*pTmp = NULL;
char	**tmpFile = NULL;
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;
}
//第一遍读出多少行
while (!feof(fp))
{
//读每一行
memset(lineBuf, 0, sizeof(lineBuf));
pTmp = fgets(lineBuf, LineMaxLen, fp);
if (pTmp == NULL)
{
continue;
}
else
{
tmplineNum ++;
}
}

tmpFile = (char **)malloc((tmplineNum +1)*sizeof(char *) );
if (tmpFile == NULL)
{
goto End;
}

//第二遍读内容
//准备环境
tmplineNum  = 0;
fseek(fp, 0L, SEEK_SET);
while (!feof(fp))
{
//读每一行
memset(lineBuf, 0, sizeof(lineBuf));
pTmp = fgets(lineBuf, LineMaxLen, fp);
if (pTmp == NULL)
{
continue;
}
else
{
int tmplen = strlen(lineBuf);
tmpFile[tmplineNum] = (char *)malloc( (tmplen+1)*sizeof(char));
if (tmpFile[tmplineNum] == NULL)
{
goto End;
}
strcpy(tmpFile[tmplineNum], lineBuf );
printf("%s", lineBuf);
tmplineNum ++;
}
}

End:

if (fp != NULL)
{
fclose(fp);
}
*lineNum = tmplineNum;
return tmpFile;
}

int readFile2(const char *pfilename/*in*/, char ***p/*out*/, int *lineNum/*int out*/)
{
int		rv = 0, tmplineNum = 0;
FILE	*fp = NULL;
char	lineBuf[LineMaxLen];
char	*pTmp = NULL;
char	**tmpFile = NULL;
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;
}
//第一遍读出多少行
while (!feof(fp))
{
//读每一行
memset(lineBuf, 0, sizeof(lineBuf));
pTmp = fgets(lineBuf, LineMaxLen, fp);
if (pTmp == NULL)
{
continue;
}
else
{
tmplineNum ++;
}
}

tmpFile = (char **)malloc((tmplineNum +1)*sizeof(char *) );
if (tmpFile == NULL)
{
goto End;
}

//第二遍读内容
//准备环境
tmplineNum  = 0;
fseek(fp, 0L, SEEK_SET);
while (!feof(fp))
{
//读每一行
memset(lineBuf, 0, sizeof(lineBuf));
pTmp = fgets(lineBuf, LineMaxLen, fp);
if (pTmp == NULL)
{
continue;
}
else
{
int tmplen = strlen(lineBuf);
tmpFile[tmplineNum] = (char *)malloc( (tmplen+1)*sizeof(char));
if (tmpFile[tmplineNum] == NULL)
{
goto End;
}
strcpy(tmpFile[tmplineNum], lineBuf );
printf("%s", lineBuf);
tmplineNum ++;
}
}

End:

if (fp != NULL)
{
fclose(fp);
}
*lineNum = tmplineNum;
*p = tmpFile;
return 0;

}

void readFile2_Free(char **p, int lineNUm)
{
int i = 0;
if (p==NULL)
{
return ;
}
for (i=0; i<lineNUm; i++)
{
free(p[i]);
}
free(p);
}

void main21()
{
char **p = NULL;
const char *pfilename = "c:/1.txt";
int lineNum = 0, i = 0;

p = readFile1(pfilename/*in*/,  &lineNum/*in out*/);
if (p == NULL)
{
return ;
}

for (i=0; i<lineNum; i++)
{
printf("%s", p[i]);
}

readFile2_Free(p, lineNum);

system("pause");
}

void main()
{
int ret = 0;
char **p = NULL;
const char *pfilename = "c:/1.txt";
int lineNum = 0, i = 0;

ret = readFile2(pfilename/*in*/, &p,  &lineNum/*in out*/);
if (ret != 0)
{

return ;
}

for (i=0; i<lineNum; i++)
{
printf("%s", p[i]);
}

readFile2_Free(p, lineNum);

system("pause");
}