[英]My c code for implementing ls, doesn't work on mac
我正面臨一個奇怪的問題,昨晚我正在做我的功課,在我的linux
上實現ls
,代碼在那里工作正常,現在當我在imac上測試它時,它不起作用。 它只讀取當前目錄,不包含子目錄。
#include <stdio.h>
#include <dirent.h>
#include <string.h>
#define GREEN "\x1b[32m"
#define BLUE "\x1b[34m"
#define WHITE "\x1b[37m"
void Usage() {
fprintf(stderr, "\nUsage: exec [OPTION]... [DIR]...\n");
fprintf(stderr, "List DIR's (directory) contents\n");
fprintf(stderr, "\nOptions\n-R\tlist subdirectories recursively\n");
return;
}
void RecDir(char * path, int flag) {
DIR * dp = opendir(path);
if(!dp) {
perror(path);
return;
}
struct dirent * ep;
char newdir[512];
printf(BLUE "\n%s :\n" WHITE, path);
while((ep = readdir(dp)))
if(strncmp(ep->d_name, ".", 1))
printf(GREEN "\t%s" WHITE, ep->d_name);
closedir(dp);
dp = opendir(path);
while((ep = readdir(dp))) if(strncmp(ep->d_name, ".", 1)) {
if(flag && ep->d_type == 4) {
sprintf(newdir, "%s/%s", path, ep->d_name);
RecDir(newdir, 1);
}
}
closedir(dp);
}
int main(int argc, char ** argv) {
switch(argc) {
case 2:
if(strcmp(argv[1], "-R") == 0)
Usage();
else
RecDir(argv[1], 0);
break;
case 3:
if(strcmp(argv[1], "-R") == 0)
RecDir(argv[2], 1);
else
Usage();
break;
default:
Usage();
}
return 0;
}
標志變量總是0
所以我在調用RecDir()
函數時更改它,以便它進入if塊:
if(flag && ep->d_type == 4) {
sprintf(newdir, "%s/%s", path, ep->d_name);
printf("here: %s\n",ep->d_name);
RecDir(newdir, 1);
}
並能夠遞歸調用RecDir()
函數。
#include <stdio.h>
#include <dirent.h>
#include <string.h>
#define GREEN "\x1b[32m"
#define BLUE "\x1b[34m"
#define WHITE "\x1b[37m"
void Usage() {
fprintf(stderr, "\nUsage: exec [OPTION]... [DIR]...\n");
fprintf(stderr, "List DIR's (directory) contents\n");
fprintf(stderr, "\nOptions\n-R\tlist subdirectories recursively\n");
return;
}
void RecDir(char * path, int flag) {
DIR * dp = opendir(path);
if(!dp) {
perror(path);
return;
}
struct dirent * ep;
char newdir[512];
printf(BLUE "\n%s :\n" WHITE, path);
while((ep = readdir(dp)))
if(strncmp(ep->d_name, ".", 1))
printf(GREEN "\t%s" WHITE, ep->d_name);
closedir(dp);
dp = opendir(path);
while((ep = readdir(dp))) if(strncmp(ep->d_name, ".", 1)) {
//printf("In While %d\n",flag);
if(flag && ep->d_type == 4) {
sprintf(newdir, "%s/%s", path, ep->d_name);
printf("here: %s\n",ep->d_name);
RecDir(newdir, 1);
}
}
closedir(dp);
}
int main(int argc, char ** argv) {
switch(argc) {
case 2:
if(strcmp(argv[1], "-R") == 0)
Usage();
else
//supplied flag=1 instead of 0, explained above.
RecDir(argv[1], 1);
break;
case 3:
if(strcmp(argv[1], "-R") == 0) {
RecDir(argv[2], 1);
}
else
Usage();
break;
default:
Usage();
}
return 0;
}
鑒於它是另一個操作系統,您首先需要確認d_type
包含您認為它的值。 在第一個循環中,作為調試,打印出d_type
以及名稱。
請注意,在第二個循環中,您第二次掃描目錄以進入子目錄時會遇到很多麻煩 - 然后在最后一秒決定不返回
flag
是否為0
。 為什么不預先測試0
flag
,而不是完全打開目錄?
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