c语言中字符串分割函数及实现方法

#include <stdio.h>
#include<string.h>
#define MAX_LEN 128
void main()
{
  int i,length,ct=0,start = -1;
  char inputBuffer[MAX_LEN],*args[MAX_LEN];
  strcpy(inputBuffer,"mv a.c b.c");
  length=strlen(inputBuffer);
   for (i = 0; i <= length; i++) {
    switch (inputBuffer[i]){
    case ' ':
    case '\t' :        /* argument separators */
      if(start != -1){
        args[ct] = &inputBuffer[start];  /* set up pointer */
        ct++;
      }
      inputBuffer[i] = '\0'; /* add a null char; make a C string */
      start = -1;
      break;
    case '\0':         /* should be the final char examined */
      if (start != -1){
        args[ct] = &inputBuffer[start];
        ct++;
      }
      inputBuffer[i] = '\0';
      args[ct] = NULL; /* no more arguments to this command */
      break;
    default :       /* some other character */
      if (start == -1)
        start = i;
    }
   }
  printf("分解之后的字符串为：\n");
  for(i=0;i<ct;i++)
    printf("%s \n",args[i]);
}

#include <stdio.h>
#include<string.h>
int main()
{
  char str[] = "mv a.c b.c";
  char *p; 
  p = strtok(str, " ");
  while(p)
  {  
    printf("%s\n", p);  
    p = strtok(NULL, " ");  
  }
  return 0;
}

#include <stdio.h>
#include<string.h>
int main()
{
  char str[] = "mv a.c b.c";
  char *p;
  char *buff;
  buff=str;
  p = strsep(&buff, " ");
  while(p)
  {
    printf("%s\n", p);
    p = strsep(&buff, " ");
  }
  return 0;
}