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Opimizing tar, adding U flag

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This commit is contained in:
David Galos 2013-07-18 15:14:53 -04:00
parent c5f10c4b06
commit cd1526715f
2 changed files with 59 additions and 46 deletions
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5
ls.1
View File

@ -3,7 +3,7 @@
ls \- list directory contents
.SH SYNOPSIS
.B ls
.RB [ \-adlt ]
.RB [ \-adltU ]
.RI [ file ...]
.SH DESCRIPTION
.B ls
@ -23,5 +23,8 @@ links, owner, group, size, and modification time.
.TP
.B \-t
sorts files by modification time instead of by name.
.TP
.B \-U
keeps the list unsorted.
.SH SEE ALSO
.IR stat (2)

92
ls.c
View File

@ -22,29 +22,30 @@ typedef struct {
time_t mtime;
} Entry;
static int entcmp(Entry *, Entry *);
static void ls(char *);
static int entcmp(const void *, const void *);
static void ls(Entry *);
static void lsdir(const char *);
static void mkent(Entry *, char *);
static void mkent(Entry *, char *, bool);
static void output(Entry *);
static bool aflag = false;
static bool dflag = false;
static bool lflag = false;
static bool tflag = false;
static bool Uflag = false;
static bool first = true;
static bool many;
static void
usage(void)
{
eprintf("usage: %s [-adlt] [FILE...]\n", argv0);
eprintf("usage: %s [-adltU] [FILE...]\n", argv0);
}
int
main(int argc, char *argv[])
{
int i, n;
int i;
Entry *ents;
ARGBEGIN {
@ -60,31 +61,33 @@ main(int argc, char *argv[])
case 't':
tflag = true;
break;
case 'U':
Uflag = true;
break;
default:
usage();
} ARGEND;
many = (argc > 1);
if(argc == 0)
*--argv = ".", argc++;
if((n = argc) > 0) {
if(!(ents = malloc(n * sizeof *ents)))
if(!(ents = malloc(argc * sizeof *ents)))
eprintf("malloc:");
for(i = 0; i < n; i++)
mkent(&ents[i], argv[i]);
qsort(ents, n, sizeof *ents,
(int (*)(const void *, const void *))entcmp);
for(i = 0; i < n; i++)
ls(ents[i].name);
}
else
ls(".");
for(i = 0; i < argc; i++)
mkent(&ents[i], argv[i], true);
qsort(ents, argc, sizeof *ents, entcmp);
for(i = 0; i < argc; i++)
ls(&ents[i]);
return 0;
}
int
entcmp(Entry *a, Entry *b)
entcmp(const void *va, const void *vb)
{
const Entry *a = va, *b = vb;
if(tflag)
return b->mtime - a->mtime;
else
@ -92,15 +95,13 @@ entcmp(Entry *a, Entry *b)
}
void
ls(char *path)
ls(Entry *ent)
{
Entry ent;
mkent(&ent, path);
if(S_ISDIR(ent.mode) && !dflag)
lsdir(path);
else
output(&ent);
if(S_ISDIR(ent->mode) && !dflag) {
lsdir(ent->name);
} else {
output(ent);
}
}
void
@ -110,7 +111,7 @@ lsdir(const char *path)
long i, n = 0;
struct dirent *d;
DIR *dp;
Entry *ents = NULL;
Entry ent, *ents = NULL;
cwd = agetcwd();
if(!(dp = opendir(path)))
@ -118,29 +119,36 @@ lsdir(const char *path)
if(chdir(path) == -1)
eprintf("chdir %s:", path);
while((d = readdir(dp))) {
if(d->d_name[0] == '.' && !aflag)
continue;
if(!(ents = realloc(ents, ++n * sizeof *ents)))
eprintf("realloc:");
if(!(p = malloc(strlen(d->d_name)+1)))
eprintf("malloc:");
strcpy(p, d->d_name);
mkent(&ents[n-1], p);
}
closedir(dp);
qsort(ents, n, sizeof *ents, (int (*)(const void *, const void *))entcmp);
if(many) {
if(!first)
putchar('\n');
printf("%s:\n", path);
first = false;
}
while((d = readdir(dp))) {
if(d->d_name[0] == '.' && !aflag)
continue;
if(Uflag){
mkent(&ent, d->d_name, lflag);
output(&ent);
} else {
if(!(ents = realloc(ents, ++n * sizeof *ents)))
eprintf("realloc:");
if(!(p = malloc(strlen(d->d_name)+1)))
eprintf("malloc:");
strcpy(p, d->d_name);
mkent(&ents[n-1], p, tflag || lflag);
}
}
closedir(dp);
if(!Uflag){
qsort(ents, n, sizeof *ents, entcmp);
for(i = 0; i < n; i++) {
output(&ents[i]);
free(ents[i].name);
}
}
if(chdir(cwd) == -1)
eprintf("chdir %s:", cwd);
free(ents);
@ -148,13 +156,15 @@ lsdir(const char *path)
}
void
mkent(Entry *ent, char *path)
mkent(Entry *ent, char *path, bool dostat)
{
struct stat st;
ent->name = path;
if(!dostat)
return;
if(lstat(path, &st) == -1)
eprintf("lstat %s:", path);
ent->name = path;
ent->mode = st.st_mode;
ent->nlink = st.st_nlink;
ent->uid = st.st_uid;