C程序双重释放或损坏错误

Question

目前正在C语言中使用一致性程序。当我尝试运行该程序时，出现错误。

这是我的C程序：

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


void print(char Table, int n) { 
    printf("%d: ", n+1); // Prints the table 
} 

int insert(const void *bb, const void *cc) { 
    return strcmp(*(const char **)bb, *(const char **)cc); 
} 

void empty(char *Table[]) { 
    strcat(Table,"NULL"); // Empties the table 
} 

int main(int argc, char *argv[]){ 


    if(argc!=3){ 
     printf("ERROR: Usage: concordance table_size"); // Errors due to not enough variables (Should be tablesize and file name) 
    } else { 

     FILE *fp; //This block opens the file user has inputted and makes the string "File_contents" set to the file's contecnts 
     fp = fopen(argv[2],"r"); 
     char *file_contents; 
     long input_file_size; 
     fseek(fp, 0, SEEK_END); 
     input_file_size = ftell(fp); 
     rewind(fp); 
     file_contents = malloc((input_file_size + 1) * (sizeof(char))); 
     fread(file_contents, sizeof(char), input_file_size, fp); 
     fclose(fp); 
     file_contents[input_file_size] = 0; 

     char *word, *words[strlen(file_contents)/2+1]; 
     int i, n; 

     for(i=0;file_contents[i];i++){ 
      file_contents[i]=tolower(file_contents[i]); //Converts all words to lower case 
     } 

     i=0; 
     word = strtok(file_contents, " ,.-:;?!"); //Chars which signal end of word 

     while(word != NULL) { 
      words[i++] = word; 
      word = strtok(NULL, " ,.-:;?!"); 
     } 

     n = i; 

     qsort(words, n, sizeof(*words), insert); 

     for(i=0; i<n; ++i){ 
      print(words[i],i); 
      printf("%s\n", words[i]); 
     } 
     empty(words); 
     fclose(fp); // Closes open file 
    } 
    return 0; 
} 

而下面是我得到的错误：

* glibc的检测*一致：双重释放或腐败（！上一页）：0x0000000001060f010

不知道是什么原因导致这个错误发生。尽管如此，任何帮助都会很大。

Answer 1

您正在将NULL作为参数传递给strtok函数。我认为这可能会导致问题

Answer 2

您没有拨打fclose()两次。我想这可能会在内部调用free()。在程序结束时删除fclose()。