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Add history and config-struct to recurse

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For loop detection, a history is mandatory. In the process of also
adding a flexible struct to recurse, the recurse-definition was moved
to fs.h.
The motivation behind the struct is to allow easy extensions to the
recurse-function without having to change the prototypes of all
functions in the process.
Adding flags is really simple as well now.

Using the recursor-struct, it's also easier to see which defaults
apply to a program (for instance, which type of follow, ...).

Another change was to add proper stat-lstat-usage in recurse. It
was wrong before.
This commit is contained in:
FRIGN
2015-03-13 00:25:32 +01:00
parent 3b187f4826
commit 9fd4a745f8
11 changed files with 131 additions and 66 deletions
Download Patch File Download Diff File Expand all files Collapse all files

73
libutil/recurse.c
View File

@@ -9,37 +9,61 @@
#include <sys/types.h>
#include <unistd.h>
#include "../fs.h"
#include "../util.h"
int recurse_follow = 'P';
int recurse_samedev = 0;
int recurse_status = 0;
void
recurse(const char *path, void (*fn)(const char *, int, void *), int depth, void *data)
recurse(const char *path, void *data, struct recursor *r)
{
struct dirent *d;
struct stat lst, st, dst;
struct history *new, *h;
struct stat st, dst;
DIR *dp;
char subpath[PATH_MAX];
int (*statf)(const char *, struct stat *);
char subpath[PATH_MAX], *statf_name;
if (lstat(path, &lst) < 0) {
if (errno != ENOENT)
weprintf("lstat %s:", path);
if (r->follow == 'P' || (r->follow == 'H' && r->depth)) {
statf_name = "lstat";
statf = lstat;
} else {
statf_name = "stat";
statf = stat;
}
if (statf(path, &st) < 0) {
if (errno != ENOENT) {
weprintf("%s %s:", statf_name, path);
recurse_status = 1;
}
return;
}
if (stat(path, &st) < 0) {
if (errno != ENOENT)
weprintf("stat %s:", path);
return;
}
if (!S_ISDIR(lst.st_mode) && !(S_ISLNK(lst.st_mode) && S_ISDIR(st.st_mode) &&
!(recurse_follow == 'P' || (recurse_follow == 'H' && depth > 0))))
if (!S_ISDIR(st.st_mode))
return;
if (!(dp = opendir(path)))
eprintf("opendir %s:", path);
new = emalloc(sizeof(struct history));
new->prev = r->hist;
r->hist = new;
new->dev = st.st_dev;
new->ino = st.st_ino;
for (h = new->prev; h; h = h->prev)
if (h->dev == st.st_dev && h->ino == st.st_ino)
return;
if (!(dp = opendir(path))) {
weprintf("opendir %s:", path);
recurse_status = 1;
return;
}
while ((d = readdir(dp))) {
if (r->follow == 'H') {
statf_name = "lstat";
statf = lstat;
}
if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
continue;
if (strlcpy(subpath, path, PATH_MAX) >= PATH_MAX)
@@ -48,11 +72,16 @@ recurse(const char *path, void (*fn)(const char *, int, void *), int depth, void
eprintf("strlcat: path too long\n");
if (strlcat(subpath, d->d_name, PATH_MAX) >= PATH_MAX)
eprintf("strlcat: path too long\n");
if (recurse_samedev && lstat(subpath, &dst) < 0) {
if (errno != ENOENT)
weprintf("stat %s:", subpath);
} else if (!(recurse_samedev && dst.st_dev != lst.st_dev))
fn(subpath, depth + 1, data);
if ((r->flags & SAMEDEV) && statf(subpath, &dst) < 0) {
if (errno != ENOENT) {
weprintf("%s %s:", statf_name, subpath);
recurse_status = 1;
}
} else if (!((r->flags & SAMEDEV) && dst.st_dev != st.st_dev)) {
r->depth++;
(r->fn)(subpath, data, r);
r->depth--;
}
}
closedir(dp);