c文件操作

#include <stdio.h>
#include <stdlib.h> //use malloc, free
#include <string.h> //use memset
#include <ctype.h> //use isdigit
#define ERROR_ILLEGAL_CHAR 1 //define error illegal character as 1
#define ERROR_NUMBERS_DIF 2 //define error numbers is not the same in different line as 2
#define ERROR_FILE_ERROR 3 //define error file error as 3
typedef struct _node{
int num;
struct _node *next;
}node;
node *head = NULL;
void insert(int num)
{
if (NULL == head)
{
head = (node*)malloc(sizeof(node));
(*head).num = num;
(*head).next = NULL;
}
else
{
node* p = head;
while (NULL != p->next) //move to end
{
p = p->next;
}
p->next = (node*)malloc(sizeof(node));
p = p->next;
(*p).num = num;
(*p).next = NULL;
}
}
void output(int rows, int cols)
{
node *p = head;
if (NULL == p)
return;
for (int i=0; i<rows; i++)
{
for (int j=0; j<cols; j++)
{
printf("%-4d", p->num);
p = p->next;
}
printf("\n");
}
}
int getData(int *row, int *col)
{
FILE *f;
char ch = 0;
char t[100];
int index = 0;
int countline = 0;
int totalline = 0;
/*若文件内容是在程序中以二进制方式打开写入的数据则将打开方式改为"rb"*/
if ((f=fopen("D:\\source\\read.dat", "r")) == NULL)
{
return ERROR_FILE_ERROR;
}
memset(t, -1, 100);
do
{
ch = fgetc(f);
if (isdigit(ch))
{
t[index++] = ch;
continue;
}
else
{
switch (ch)
{
case ',':
case '.':
case ' ':
if ((-1 != t[0]))
{
insert(atoi(t));
memset(t, -1, 100);
index = 0;
countline++;
}
break;
case EOF:
case '\n':
if ((-1 == t[0]) && (0 == countline))//null line
{
break;
}
else
{
if (-1 != t[0])
{
insert(atoi(t));
memset(t, -1, 100);
index = 0;
countline++;
}
}
if (0 != countline)
{
if (0 == totalline)
{
totalline = countline;
*col = totalline;
}
else
{
if (countline != totalline)
{
return ERROR_NUMBERS_DIF;
}