[英]getting segmentation fault during execution
我正在嘗試為特定目錄制作樹形結構。 目錄的路徑由用戶輸入,並傳遞給opendir func。 readdir func讀取當前目錄,並遞歸讀取子目錄。 我無法調試該程序。
#include<stdio.h>
#include<dirent.h>
#include<string.h>
#include<malloc.h>
#include<sys/stat.h>
#include<limits.h>
#include<stdlib.h>
#define _GNU_SOURCE
struct tree{
char dname[100];
char fname[200];
int i;
struct tree *openf[100];
};
void getinto(char [],char [],struct tree*);
struct dirent *dpointer;
int found=0;
int k=0;
_Bool is_dir(const char* path) {
struct stat buf;
stat(path, &buf);
return S_ISDIR(buf.st_mode);
}
int main() {
char path[100]=".";
DIR *dr;
struct tree *rootnode;
rootnode=(struct tree*)malloc(sizeof(struct tree));
printf("enter path :: ");
scanf("%s",path);
//printf("helllo\n");
rootnode->i=0;
dr=opendir(path);
//printf("helllo\n");
strcpy(rootnode->dname,path);
if((dpointer=readdir(dr))==NULL){
printf("current directory is empty !!");
}
while ((dpointer=readdir(dr))!=NULL){
struct tree *rootchild;
rootchild=(struct tree*)malloc(sizeof(struct tree));
rootnode->openf[rootnode->i++]=rootchild;
if (strcmp(dpointer->d_name,"..")==0 || strcmp(dpointer->d_name,".")==0 )
continue;
//printf("helllo\n");
if(is_dir(dpointer->d_name)){
printf("%s is directory \n",dpointer->d_name);
getinto(dpointer->d_name,path,rootchild);
//printf("helllo loop\n");
printf("%s is directory \n",dpointer->d_name);
}
else{
strcpy(rootchild->dname,dpointer->d_name);
//printf("helllo loop\n");
printf("%s is file \n",dpointer->d_name);
}
}
closedir(dr);
return 0;
}
void getinto(char sfilename[],char spath[],struct tree* this){
char filename[100],currentpath[100],temp[100];
DIR *d=opendir(currentpath);
strcpy(filename,sfilename);
strcpy(currentpath,spath);
strcat(currentpath,"/");
strcat(currentpath,filename);
printf("helllo function\n");
d=opendir(currentpath);
//printf("helllo function\n");
this->i=0;
while((dpointer=readdir(d))!=NULL){
struct tree *child;
child=(struct tree*)malloc(sizeof(struct tree));
this->openf[this->i++]=child;
if (strcmp(dpointer->d_name,"..")==0 || strcmp(dpointer->d_name,".")==0 )
continue;
//printf("helllo function loop\n");
if(is_dir(dpointer->d_name)){
printf("%s is directory \n",dpointer->d_name);
getinto(dpointer->d_name,currentpath,child);
//printf("helllo loop\n");
printf("%s is directory \n",dpointer->d_name);
}
else{
strcpy(child->dname,dpointer->d_name);
//printf("helllo loop\n");
printf("%s is file \n",dpointer->d_name);
}
}
closedir(d);
}
每次執行時,都會出現分段錯誤:分段錯誤(核心已轉儲)
我期望它可以干凈地創建一個動態樹,並將每個節點的數據作為文件或目錄的名稱。
在
_Bool is_dir(const char* path) {
struct stat buf;
stat(path, &buf);
return S_ISDIR(buf.st_mode);
}
stat
需要使用char*
類型的路徑名。
句法:
int stat(const char *pathname, struct stat *statbuf);
但是你過去了
if(is_dir((const char*)dr))
DIR
類型的dr
。
只需如下更改is_dir
調用即可。
is_dir(dpointer->d_name) //in main as well as in getinto function
同樣, readdir
將返回以下條目:
. //current dir
.. //parent dir
因此,您需要跳過main
這兩個條目,否則getinfo
的opendir
將失敗,從而導致getinfo
崩潰時的readdir
。
因此,如下跳過main
這些條目。
while ((dpointer=readdir(dr))!=NULL){
if (strcmp(dpointer->d_name,"..")==0 || strcmp(dpointer->d_name,".")==0 )
continue;
.....
.....
}
這段代碼最終對我來說非常完美'
#include<stdio.h>
#include<dirent.h>
#include<string.h>
#include<malloc.h>
#include<sys/stat.h>
#include<limits.h>
#include<stdlib.h>
#define _GNU_SOURCE
struct tree{
char dname[1000];
char fname[2000];
int i;
struct tree *openf[1000];
};
void getinto(char [],char [],struct tree*);
struct dirent *dpointer;
int found=0;
int k=0;
_Bool is_dir(const char* path) {
struct stat buf;
stat(path, &buf);
return S_ISDIR(buf.st_mode);
}
int main() {
char path[1000]=".";
DIR *dr;
struct tree *rootnode;
rootnode=(struct tree*)malloc(sizeof(struct tree));
printf("enter path :: ");
scanf("%s",path);
//printf("helllo\n");
rootnode->i=0;
dr=opendir(path);
//printf("helllo\n");
strcpy(rootnode->dname,path);
if((dpointer=readdir(dr))==NULL){
printf("current directory is empty !!");
}
while ((dpointer=readdir(dr))!=NULL){
struct tree *rootchild;
rootchild=(struct tree*)malloc(sizeof(struct tree));
rootnode->openf[rootnode->i++]=rootchild;
if (strcmp(dpointer->d_name,"..")==0 || strcmp(dpointer->d_name,".")==0 )
continue;
//printf("helllo\n");
if(is_dir(dpointer->d_name)){
printf("%s is directory \n",dpointer->d_name);
getinto(dpointer->d_name,path,rootchild);
//printf("helllo loop\n");
//printf("%s is directory \n",dpointer->d_name);
}
else{
strcpy(rootchild->dname,dpointer->d_name);
//printf("helllo loop\n");
printf("%s is file \n",dpointer->d_name);
}
}
closedir(dr);
return 0;
}
void getinto(char sfilename[],char spath[],struct tree* this){
char filename[1000],currentpath[1000],temp[1000];
DIR *d=opendir(currentpath);
strcpy(filename,sfilename);
strcpy(currentpath,spath);
strcat(currentpath,"/");
strcat(currentpath,filename);
printf("%s",currentpath);
printf("\nhelllo function\n");
d=opendir(currentpath);
//printf("helllo function\n");
this->i=0;
while((dpointer=readdir(d))!=NULL){
struct tree *child;
child=(struct tree*)malloc(sizeof(struct tree));
this->openf[this->i++]=child;
if (strcmp(dpointer->d_name,"..")==0 || strcmp(dpointer->d_name,".")==0 )
continue;
//printf("helllo function loop\n");
if(is_dir(dpointer->d_name)){
printf("%s is directory \n",dpointer->d_name);
//getinto(dpointer->d_name,currentpath,child);
//printf("helllo loop\n");
printf("%s is directory \n",dpointer->d_name);
}
else{
strcpy(child->dname,dpointer->d_name);
//printf("helllo loop\n");
printf("%s is file \n",dpointer->d_name);
}
}
printf("\niits over!!");
closedir(d);
return ;
}
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