实现一个strtok

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

#define SIZE 60

struct stu
{
int sno;
char name[20];
float score;
};
typedef char (*type)[20];

type fun(char *str,char flag);
int main(int argc,char **argv)
{
FILE *fp;
char buf[SIZE];
type p;
int n;
struct stu st;

if( (fp = fopen(argv[1],"r")) == NULL)
{
  perror("fopen");
  exit(1);
}

while(fgets(buf,SIZE,fp)!=NULL)
{
// printf("%s",buf);
  p = fun(buf,'\t');
  st.sno = atoi(*p);
  strcpy(st.name,*(p+1));
  st.score = atof(*(p+2));
  printf("%d\t%s\t%.2f\n",st.sno,st.name,st.score);
}

fclose(fp);
return 0;
}

type fun(char *str,char flag)
{

int i,j,n = 0,m = 20;
char *p = str;

while(*p)
{
  if(*p == flag)
   n++;
  p++;
}
static char tmp[10][20];

for(i = 0; i < n+1; i++)
{
  for(j = 0;(*str != flag )&&(*str != '\0');j++)
  {
   tmp[i][j] = *str++;
  }
  str++;
  tmp[i][j] = '\0';
//  printf("tmp[i] = %s\n",tmp[i]);
}
return tmp;
}