-1

使用下面的代码:

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


int main() {

  int MAX_INPUT_SIZE = 200;
  volatile int running = 1;
  while(running) {

char input[MAX_INPUT_SIZE];
char *tokens[100];
const char* cmds[] = {"wait", "pwd", "cd", "exit"};
char *cmdargs[100];

printf("shell> ");
fgets(input, MAX_INPUT_SIZE, stdin);

//tokenize input string, put each token into an array
char *space;
space = strtok(input, " ");
tokens[0] = space;

int i = 1;
while (space != NULL) {
  space = strtok(NULL, " ");
  tokens[i] = space;
  ++i;
}

//copy tokens after first one into string
strcpy((char*)cmdargs, ("%s ",tokens[1]));
for (i = 2; tokens[i] != NULL; i++) {
  strcat((char*)cmdargs, " ");
  strcat((char*)cmdargs, tokens[i]);
}


//compare tokens[0] to list of internal commands
int isInternal = -1;
for (i = 0; i < 4; i++) {
  if (strcmp(tokens[0], cmds[i]) == 0) {
isInternal = i;
  }
}

char *wd[200];
switch(isInternal) {
case 0:
  //wait
  printf("WAIT \n");
  break;
case 1:
  //pwd
  printf("PWD \n");
  break;
case 2:
  //cd
  printf("CD \n");
  break;
case 3:
  //exit
  printf("EXIT" \n");
  break;
case -1:
  //not internal command, continue
  break;
}


/*
for (i = 0; tokens[i] != NULL; i++) {
  printf("%s ", tokens[i]);
}
printf("\n");
*/
  }
}

gcc 给了我一个错误,说segmentation fault (core dumped)每当我输入输入时,我都不明白发生了什么。有任何想法吗?

我相当肯定它与 switch 语句有关,但我不确定问题出在哪里,因为 switch 所做的只是打印出调试行。

注意:我收到segmentation fault (core dumped)输入错误:wait, pwd, cd, exit.

4

1 回答 1

1

使用 -g 标签编译它。然后一旦你编译它,做“gdb a.out”。

键入“运行”。

那在哪里”。

它会告诉你你的段错误在哪条线上。

如果您需要更多帮助,请在 Google 中搜索 GDB :)

于 2013-09-15T18:41:56.100 回答