如何递归遍历目录并在C中打印所有文件? [英] How to recursively walk through a directory and print all files in C?
问题描述
我试图递归地遍历目录并打印出所有文件。
I am trying to recursively walk through a directory and print out all of the files.
当我尝试使用以下代码进行操作时,例如,我使用sprint(。,。)调用了该函数,结果得到了一堆点。
When I try doing it with the code below, for example I call the function with sprint(".", ".") I get an output of a bunch of dots.
当我减少允许的打开进程的数量(ulimit -n 20)时,我得到17个点。不过我不明白,因为我认为readdir()和opendir()不会产生新的进程。这是我的代码:
When I reduce the amount of open processes allowed (ulimit -n 20) I get 17 dots. I don't understand though because I thought readdir() and opendir() doesn't make new processes. Here is my code:
void sprint(char *filename, char * dirToOpen) {
DIR *directory = opendir(dirToOpen);
struct dirent *entry;
struct stat s;
char pathname[1024];
if (directory) { /*if it's a directory*/
while ((entry = readdir(directory)) != NULL) { /*while there are more entries to read*/
if(strcmp(entry->d_name, filename) == 0) /*if entry name corresponds to filename, print it*/
printf("%s\n", filename);
sprintf(pathname, "./%s", entry->d_name); /*makes pathname*/
if (lstat(pathname, &s) == 0 && S_ISDIR(s.st_mode)) { /*if the file is a directory*/
if(strcmp(entry->d_name, "..") != 0 && strcmp(entry->d_name, ".") != 0) /*if the directory isn't . or ..*/
sprint(filename, entry->d_name);
}
}
closedir(directory);
}
}
其余文件,因为它仅打印点,而不打印完整文件名。我认为它在我的最后一个if循环中,但是我不确定。
Also somewhere along the way it doesn't reach the rest of the files because it only prints dots, not the full file name. I think it is somewhere in my last if loop but I'm not sure.
推荐答案
下面是执行该操作的递归代码:
Here is a recursive code that does that:
void sprint(char *filename, char * dirToOpen, int level = 0)
{
DIR *dir;
struct dirent *entry;
struct stat s;
if (!(dir = opendir(dirToOpen)))
return;
if (!(entry = readdir(dir)))
return;
do
{
if(lstat(dirToOpen, &s) == 0 && S_ISDIR(s.st_mode)) /*if it's a directory*/
{
char path[1024];
int len = snprintf(path, sizeof(path)-1, "%s/%s", dirToOpen, entry->d_name); /*makes pathname*/
path[len] = 0;
if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0) /*if the directory isn't . or ..*/
continue;
printf("%*s[%s]\n", level * 2, "", entry->d_name);
sprint(filename ,path, level + 1);
}
else
{
if(strcmp(entry->d_name, filename) == 0 || strcmp(filename, ".") == 0) /*if entry name corresponds to filename, print it*/
printf("%*s- %s\n", 2, "", entry->d_name);
}
} while (entry = readdir(dir)); /*while there are more entries to read*/
closedir(dir);
}
用 sprint(。, 。
递归地遍历目录并打印出所有文件。
Call it with sprint(".", ".");
to recursively walk through a directory and print out all of the files.
从此答案。
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