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-rw-r--r--toys/posix/ls.c493
1 files changed, 493 insertions, 0 deletions
diff --git a/toys/posix/ls.c b/toys/posix/ls.c
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+/* vi: set sw=4 ts=4:
+ *
+ * ls.c - list files
+ *
+ * Copyright 2012 Andre Renaud <andre@bluewatersys.com>
+ * Copyright 2012 Rob Landley <rob@landley.net>
+ *
+ * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/ls.html
+
+// "[-Cl]"
+USE_LS(NEWTOY(ls, "goACFHLRSacdfiklmnpqrstux1", TOYFLAG_BIN))
+
+config LS
+ bool "ls"
+ default y
+ help
+ usage: ls [-ACFHLRSacdfiklmnpqrstux1] [directory...]
+ list files
+
+ what to show:
+ -a all files including .hidden
+ -c use ctime for timestamps
+ -d directory, not contents
+ -i inode number
+ -k block sizes in kilobytes
+ -p put a '/' after directory names
+ -q unprintable chars as '?'
+ -s size (in blocks)
+ -u use access time for timestamps
+ -A list all files except . and ..
+ -H follow command line symlinks
+ -L follow symlinks
+ -R recursively list files in subdirectories
+ -F append file type indicator (/=dir, *=exe, @=symlink, |=FIFO)
+
+ output formats:
+ -1 list one file per line
+ -C columns (sorted vertically)
+ -g like -l but no owner
+ -l long (show full details for each file)
+ -m comma separated
+ -n like -l but numeric uid/gid
+ -o like -l but no group
+ -x columns (sorted horizontally)
+
+ sorting (default is alphabetical):
+ -f unsorted
+ -r reverse
+ -t timestamp
+ -S size
+*/
+
+#include "toys.h"
+
+#define FLAG_1 (1<<0)
+#define FLAG_x (1<<1)
+#define FLAG_u (1<<2)
+#define FLAG_t (1<<3)
+#define FLAG_s (1<<4)
+#define FLAG_r (1<<5)
+#define FLAG_q (1<<6)
+#define FLAG_p (1<<7)
+#define FLAG_n (1<<8)
+#define FLAG_m (1<<9)
+#define FLAG_l (1<<10)
+#define FLAG_k (1<<11)
+#define FLAG_i (1<<12)
+#define FLAG_f (1<<13)
+#define FLAG_d (1<<14)
+#define FLAG_c (1<<15)
+#define FLAG_a (1<<16)
+#define FLAG_S (1<<17)
+#define FLAG_R (1<<18)
+#define FLAG_L (1<<19)
+#define FLAG_H (1<<20)
+#define FLAG_F (1<<21)
+#define FLAG_C (1<<22)
+#define FLAG_A (1<<23)
+#define FLAG_o (1<<24)
+#define FLAG_g (1<<25)
+
+// test sst output (suid/sticky in ls flaglist)
+
+// ls -lR starts .: then ./subdir:
+
+DEFINE_GLOBALS(
+ struct dirtree *files;
+
+ unsigned screen_width;
+ int nl_title;
+
+ // group and user can make overlapping use of the utoa() buf, so move it
+ char uid_buf[12];
+)
+
+#define TT this.ls
+
+void dlist_to_dirtree(struct dirtree *parent)
+{
+ // Turn double_list into dirtree
+ struct dirtree *dt = parent->child;
+ if (dt) {
+ dt->parent->next = NULL;
+ while (dt) {
+ dt->parent = parent;
+ dt = dt->next;
+ }
+ }
+}
+
+static char endtype(struct stat *st)
+{
+ mode_t mode = st->st_mode;
+ if ((toys.optflags&(FLAG_F|FLAG_p)) && S_ISDIR(mode)) return '/';
+ if (toys.optflags & FLAG_F) {
+ if (S_ISLNK(mode)) return '@';
+ if (S_ISREG(mode) && (mode&0111)) return '*';
+ if (S_ISFIFO(mode)) return '|';
+ if (S_ISSOCK(mode)) return '=';
+ }
+ return 0;
+}
+
+static char *getusername(uid_t uid)
+{
+ struct passwd *pw = getpwuid(uid);
+ utoa_to_buf(uid, TT.uid_buf, 12);
+ return pw ? pw->pw_name : TT.uid_buf;
+}
+
+static char *getgroupname(gid_t gid)
+{
+ struct group *gr = getgrgid(gid);
+ return gr ? gr->gr_name : utoa(gid);
+}
+
+// Figure out size of printable entry fields for display indent/wrap
+
+static void entrylen(struct dirtree *dt, unsigned *len)
+{
+ struct stat *st = &(dt->st);
+ unsigned flags = toys.optflags;
+
+ *len = strlen(dt->name);
+ if (endtype(st)) ++*len;
+ if (flags & FLAG_m) ++*len;
+
+ if (flags & FLAG_i) *len += (len[1] = numlen(st->st_ino));
+ if (flags & (FLAG_l|FLAG_o|FLAG_n|FLAG_g)) {
+ unsigned fn = flags & FLAG_n;
+ len[2] = numlen(st->st_nlink);
+ len[3] = strlen(fn ? utoa(st->st_uid) : getusername(st->st_uid));
+ len[4] = strlen(fn ? utoa(st->st_gid) : getgroupname(st->st_gid));
+ len[5] = numlen(st->st_size);
+ }
+ if (flags & FLAG_s) *len += (len[6] = numlen(st->st_blocks));
+}
+
+static int compare(void *a, void *b)
+{
+ struct dirtree *dta = *(struct dirtree **)a;
+ struct dirtree *dtb = *(struct dirtree **)b;
+ int ret = 0, reverse = (toys.optflags & FLAG_r) ? -1 : 1;
+
+ if (toys.optflags & FLAG_S) {
+ if (dta->st.st_size > dtb->st.st_size) ret = -1;
+ else if (dta->st.st_size < dtb->st.st_size) ret = 1;
+ }
+ if (toys.optflags & FLAG_t) {
+ if (dta->st.st_mtime > dtb->st.st_mtime) ret = -1;
+ else if (dta->st.st_mtime < dtb->st.st_mtime) ret = 1;
+ }
+ if (!ret) ret = strcmp(dta->name, dtb->name);
+ return ret * reverse;
+}
+
+// callback from dirtree_recurse() determining how to handle this entry.
+
+static int filter(struct dirtree *new)
+{
+ int flags = toys.optflags;
+
+ // Special case to handle enormous dirs without running out of memory.
+ if (flags == (FLAG_1|FLAG_f)) {
+ xprintf("%s\n", new->name);
+ return 0;
+ }
+
+ if (!(flags&FLAG_f)) {
+ if (flags & FLAG_a) return 0;
+ if (!(flags & FLAG_A) && new->name[0]=='.') return 0;
+ }
+
+ if (flags & FLAG_u) new->st.st_mtime = new->st.st_atime;
+ if (flags & FLAG_c) new->st.st_mtime = new->st.st_ctime;
+ if (flags & FLAG_k) new->st.st_blocks = (new->st.st_blocks + 1) / 2;
+ return dirtree_notdotdot(new);
+}
+
+// For column view, calculate horizontal position (for padding) and return
+// index of next entry to display.
+
+static unsigned long next_column(unsigned long ul, unsigned long dtlen,
+ unsigned columns, unsigned *xpos)
+{
+ unsigned long transition;
+ unsigned height, widecols;
+
+ // Horizontal sort is easy
+ if (!(toys.optflags & FLAG_C)) {
+ *xpos = ul % columns;
+ return ul;
+ }
+
+ // vertical sort
+
+ // For -x, calculate height of display, rounded up
+ height = (dtlen+columns-1)/columns;
+
+ // Sanity check: does wrapping render this column count impossible
+ // due to the right edge wrapping eating a whole row?
+ if (height*columns - dtlen >= height) {
+ *xpos = columns;
+ return 0;
+ }
+
+ // Uneven rounding goes along right edge
+ widecols = dtlen % height;
+ if (!widecols) widecols = height;
+ transition = widecols * columns;
+ if (ul < transition) {
+ *xpos = ul % columns;
+ return (*xpos*height) + (ul/columns);
+ }
+
+ ul -= transition;
+ *xpos = ul % (columns-1);
+
+ return (*xpos*height) + widecols + (ul/(columns-1));
+}
+
+// Display a list of dirtree entries, according to current format
+// Output types -1, -l, -C, or stream
+
+static void listfiles(int dirfd, struct dirtree *indir)
+{
+ struct dirtree *dt, **sort = 0;
+ unsigned long dtlen = 0, ul = 0;
+ unsigned width, flags = toys.optflags, totals[7], len[7],
+ *colsizes = (unsigned *)(toybuf+260), columns = (sizeof(toybuf)-260)/4;
+
+ memset(totals, 0, sizeof(totals));
+
+ // Silently descend into single directory listed by itself on command line.
+ // In this case only show dirname/total header when given -R.
+ if (!indir->parent) {
+ if (!(dt = indir->child)) return;
+ if (S_ISDIR(dt->st.st_mode) && !dt->next && !(flags & FLAG_d)) {
+ dt->extra = 1;
+ listfiles(open(dt->name, 0), dt);
+ return;
+ }
+ } else {
+ // Read directory contents. We dup() the fd because this will close it.
+ indir->data = dup(dirfd);
+ dirtree_recurse(indir, filter, (flags&FLAG_L));
+ }
+
+ // Copy linked list to array and sort it. Directories go in array because
+ // we visit them in sorted order.
+
+ for (;;) {
+ for (dt = indir->child; dt; dt = dt->next) {
+ if (sort) sort[dtlen] = dt;
+ dtlen++;
+ }
+ if (sort) break;
+ sort = xmalloc(dtlen * sizeof(void *));
+ dtlen = 0;
+ continue;
+ }
+
+ // Label directory if not top of tree, or if -R
+ if (indir->parent && (!indir->extra || (flags & FLAG_R)))
+ {
+ char *path = dirtree_path(indir, 0);
+
+ if (TT.nl_title++) xputc('\n');
+ xprintf("%s:\n", path);
+ free(path);
+ }
+
+ if (!(flags & FLAG_f)) qsort(sort, dtlen, sizeof(void *), (void *)compare);
+
+ // Find largest entry in each field for display alignment
+ if (flags & (FLAG_C|FLAG_x)) {
+
+ // columns can't be more than toybuf can hold, or more than files,
+ // or > 1/2 screen width (one char filename, one space).
+ if (columns > TT.screen_width/2) columns = TT.screen_width/2;
+ if (columns > dtlen) columns = dtlen;
+
+ // Try to fit as many columns as we can, dropping down by one each time
+ for (;columns > 1; columns--) {
+ unsigned c, totlen = columns;
+
+ memset(colsizes, 0, columns*sizeof(unsigned));
+ for (ul=0; ul<dtlen; ul++) {
+ entrylen(sort[next_column(ul, dtlen, columns, &c)], len);
+ if (c == columns) break;
+ // Does this put us over budget?
+ if (*len > colsizes[c]) {
+ totlen += *len-colsizes[c];
+ colsizes[c] = *len;
+ if (totlen > TT.screen_width) break;
+ }
+ }
+ // If it fit, stop here
+ if (ul == dtlen) break;
+ }
+ } else if (flags & (FLAG_l|FLAG_o|FLAG_n|FLAG_g|FLAG_s)) {
+ unsigned long blocks = 0;
+
+ for (ul = 0; ul<dtlen; ul++)
+ {
+ entrylen(sort[ul], len);
+ for (width=0; width<6; width++)
+ if (len[width] > totals[width]) totals[width] = len[width];
+ blocks += sort[ul]->st.st_blocks;
+ }
+
+ if (indir->parent) xprintf("total %lu\n", blocks);
+ }
+
+ // Loop through again to produce output.
+ memset(toybuf, ' ', 256);
+ width = 0;
+ for (ul = 0; ul<dtlen; ul++) {
+ unsigned curcol;
+ unsigned long next = next_column(ul, dtlen, columns, &curcol);
+ struct stat *st = &(sort[next]->st);
+ mode_t mode = st->st_mode;
+ char et = endtype(st);
+
+ // Skip directories at the top of the tree when -d isn't set
+ if (S_ISDIR(mode) && !indir->parent && !(flags & FLAG_d)) continue;
+ TT.nl_title=1;
+
+ // Handle padding and wrapping for display purposes
+ entrylen(sort[next], len);
+ if (ul) {
+ if (flags & FLAG_m) xputc(',');
+ if (flags & (FLAG_C|FLAG_x)) {
+ if (!curcol) xputc('\n');
+ } else if ((flags & FLAG_1) || width+1+*len > TT.screen_width) {
+ xputc('\n');
+ width = 0;
+ } else {
+ xputc(' ');
+ width++;
+ }
+ }
+ width += *len;
+
+ if (flags & FLAG_i)
+ xprintf("% *lu ", len[1], (unsigned long)st->st_ino);
+ if (flags & FLAG_s)
+ xprintf("% *lu ", len[6], (unsigned long)st->st_blocks);
+
+ if (flags & (FLAG_l|FLAG_o|FLAG_n|FLAG_g)) {
+ struct tm *tm;
+ char perm[11], thyme[64], c, d, *usr, *upad, *grp, *grpad;
+ int i, bit;
+
+ perm[10]=0;
+ for (i=0; i<9; i++) {
+ bit = mode & (1<<i);
+ c = i%3;
+ if (!c && (mode & (1<<((d=i/3)+9)))) {
+ c = "tss"[d];
+ if (!bit) c &= ~0x20;
+ } else c = bit ? "xwr"[c] : '-';
+ perm[9-i] = c;
+ }
+
+ if (S_ISDIR(mode)) c = 'd';
+ else if (S_ISBLK(mode)) c = 'b';
+ else if (S_ISCHR(mode)) c = 'c';
+ else if (S_ISLNK(mode)) c = 'l';
+ else if (S_ISFIFO(mode)) c = 'p';
+ else if (S_ISSOCK(mode)) c = 's';
+ else c = '-';
+ *perm = c;
+
+ tm = localtime(&(st->st_mtime));
+ strftime(thyme, sizeof(thyme), "%F %H:%M", tm);
+
+ if (flags&FLAG_o) grp = grpad = toybuf+256;
+ else {
+ grp = (flags&FLAG_n) ? utoa(st->st_gid)
+ : getgroupname(st->st_gid);
+ grpad = toybuf+256-(totals[4]-len[4]);
+ }
+
+ if (flags&FLAG_g) usr = upad = toybuf+256;
+ else {
+ upad = toybuf+255-(totals[3]-len[3]);
+ if (flags&FLAG_n) {
+ usr = TT.uid_buf;
+ utoa_to_buf(st->st_uid, TT.uid_buf, 12);
+ } else usr = getusername(st->st_uid);
+ }
+
+ // Coerce the st types into something we know we can print.
+ xprintf("%s% *ld %s%s%s%s% *"PRId64" %s ", perm, totals[2]+1,
+ (long)st->st_nlink, usr, upad, grp, grpad, totals[5]+1,
+ (int64_t)st->st_size, thyme);
+ }
+
+ if (flags & FLAG_q) {
+ char *p;
+ for (p=sort[next]->name; *p; p++) xputc(isprint(*p) ? *p : '?');
+ } else xprintf("%s", sort[next]->name);
+ if ((flags & (FLAG_l|FLAG_o|FLAG_n|FLAG_g)) && S_ISLNK(mode))
+ xprintf(" -> %s", sort[next]->symlink);
+
+ if (et) xputc(et);
+
+ // Pad columns
+ if (flags & (FLAG_C|FLAG_x)) {
+ curcol = colsizes[curcol] - *len;
+ if (curcol >= 0) xprintf("%s", toybuf+255-curcol);
+ }
+ }
+
+ if (width) xputc('\n');
+
+ // Free directory entries, recursing first if necessary.
+
+ for (ul = 0; ul<dtlen; free(sort[ul++])) {
+ if ((flags & FLAG_d) || !S_ISDIR(sort[ul]->st.st_mode)
+ || !dirtree_notdotdot(sort[ul])) continue;
+
+ // Recurse into dirs if at top of the tree or given -R
+ if (!indir->parent || (flags & FLAG_R))
+ listfiles(openat(dirfd, sort[ul]->name, 0), sort[ul]);
+ }
+ free(sort);
+ if (dirfd != AT_FDCWD) close(indir->data);
+}
+
+void ls_main(void)
+{
+ char **s, *noargs[] = {".", 0};
+ struct dirtree *dt;
+
+ // Do we have an implied -1
+ if (!isatty(1) || (toys.optflags&(FLAG_l|FLAG_o|FLAG_n|FLAG_g)))
+ toys.optflags |= FLAG_1;
+ else {
+ TT.screen_width = 80;
+ terminal_size(&TT.screen_width, NULL);
+ }
+ // The optflags parsing infrastructure should really do this for us,
+ // but currently it has "switch off when this is set", so "-dR" and "-Rd"
+ // behave differently
+ if (toys.optflags & FLAG_d) toys.optflags &= ~FLAG_R;
+
+ // Iterate through command line arguments, collecting directories and files.
+ // Non-absolute paths are relative to current directory.
+ TT.files = dirtree_add_node(0, 0, 0);
+ for (s = *toys.optargs ? toys.optargs : noargs; *s; s++) {
+ dt = dirtree_add_node(AT_FDCWD, *s,
+ (toys.optflags & (FLAG_L|FLAG_H|FLAG_l))^FLAG_l);
+
+ if (!dt) {
+ toys.exitval = 1;
+ continue;
+ }
+
+ // Typecast means double_list->prev temporarirly goes in dirtree->parent
+ dlist_add_nomalloc((struct double_list **)&TT.files->child,
+ (struct double_list *)dt);
+ }
+
+ // Turn double_list into dirtree
+ dlist_to_dirtree(TT.files);
+
+ // Display the files we collected
+ listfiles(AT_FDCWD, TT.files);
+
+ if (CFG_TOYBOX_FREE) free(TT.files);
+}
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