[unix-history] / usr / src / bin / ls / ls.c

/*
* Copyright (c) 1989, 1993
*      The Regents of the University of California.  All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Michael Fischbein.
*
* %sccs.include.redist.c%
*/

#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1989, 1993\n\
       The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)ls.c        8.1 (Berkeley) %G%";
#endif /* not lint */

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>

#include <dirent.h>
#include <err.h>
#include <errno.h>
#include <fts.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "ls.h"
#include "extern.h"

static void      display __P((FTSENT *, FTSENT *));
static int       mastercmp __P((const FTSENT **, const FTSENT **));
static void      traverse __P((int, char **, int));

static void (*printfcn) __P((DISPLAY *));
static int (*sortfcn) __P((const FTSENT *, const FTSENT *));

long blocksize;                 /* block size units */
int termwidth = 80;             /* default terminal width */

/* flags */
int f_accesstime;               /* use time of last access */
int f_column;                   /* columnated format */
int f_flags;                    /* show flags associated with a file */
int f_inode;                    /* print inode */
int f_listdir;                  /* list actual directory, not contents */
int f_listdot;                  /* list files beginning with . */
int f_longform;                 /* long listing format */
int f_newline;                  /* if precede with newline */
int f_nonprint;                 /* show unprintables as ? */
int f_nosort;                   /* don't sort output */
int f_recursive;                /* ls subdirectories also */
int f_reversesort;              /* reverse whatever sort is used */
int f_sectime;                  /* print the real time for all files */
int f_singlecol;                /* use single column output */
int f_size;                     /* list size in short listing */
int f_statustime;               /* use time of last mode change */
int f_dirname;                  /* if precede with directory name */
int f_timesort;                 /* sort by time vice name */
int f_type;                     /* add type character for non-regular files */

int
main(argc, argv)
       int argc;
       char *argv[];
{
       static char dot[] = ".", *dotav[] = { dot, NULL };
       struct winsize win;
       int ch, fts_options, notused;
       char *p;

       /* Terminal defaults to -Cq, non-terminal defaults to -1. */
       if (isatty(STDOUT_FILENO)) {
               if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &win) == -1 ||
                   !win.ws_col) {
                       if (p = getenv("COLUMNS"))
                               termwidth = atoi(p);
               }
               else
                       termwidth = win.ws_col;
               f_column = f_nonprint = 1;
       } else
               f_singlecol = 1;

       /* Root is -A automatically. */
       if (!getuid())
               f_listdot = 1;

       fts_options = FTS_PHYSICAL;
       while ((ch = getopt(argc, argv, "1ACFLRTacdfgiloqrstu")) != EOF) {
               switch (ch) {
               /*
                * The -1, -C and -l options all override each other so shell
                * aliasing works right.
                */
               case '1':
                       f_singlecol = 1;
                       f_column = f_longform = 0;
                       break;
               case 'C':
                       f_column = 1;
                       f_longform = f_singlecol = 0;
                       break;
               case 'l':
                       f_longform = 1;
                       f_column = f_singlecol = 0;
                       break;
               /* The -c and -u options override each other. */
               case 'c':
                       f_statustime = 1;
                       f_accesstime = 0;
                       break;
               case 'u':
                       f_accesstime = 1;
                       f_statustime = 0;
                       break;
               case 'F':
                       f_type = 1;
                       break;
               case 'L':
                       fts_options &= ~FTS_PHYSICAL;
                       fts_options |= FTS_LOGICAL;
                       break;
               case 'R':
                       f_recursive = 1;
                       break;
               case 'a':
                       fts_options |= FTS_SEEDOT;
                       /* FALLTHROUGH */
               case 'A':
                       f_listdot = 1;
                       break;
               /* The -d option turns off the -R option. */
               case 'S':
                       Sflg++; /* fall into... */
               case 'd':
                       f_listdir = 1;
                       f_recursive = 0;
                       break;
               case 'f':
                       f_nosort = 1;
                       break;
               case 'g':               /* Compatibility with 4.3BSD. */
                       break;
               case 'i':
                       f_inode = 1;
                       break;
               case 'o':
                       f_flags = 1;
                       break;
               case 'q':
                       f_nonprint = 1;
                       break;
               case 'r':
                       f_reversesort = 1;
                       break;
               case 's':
                       f_size = 1;
                       break;
               case 'T':
                       f_sectime = 1;
                       break;
               case 't':
                       f_timesort = 1;
                       break;
               default:
               case '?':
                       usage();
               }
       }
       argc -= optind;
       argv += optind;

       /*
        * If not -F, -i, -l, -s or -t options, don't require stat
        * information.
        */
       if (!f_inode && !f_longform && !f_size && !f_timesort && !f_type)
               fts_options |= FTS_NOSTAT;

       /*
        * If not -F, -d or -l options, follow any symbolic links listed on
        * the command line.
        */
       if (!f_longform && !f_listdir && !f_type)
               fts_options |= FTS_COMFOLLOW;

       /* If -l or -s, figure out block size. */
       if (f_longform || f_size) {
               (void)getbsize(&notused, &blocksize);
               blocksize /= 512;
       }

       /* Select a sort function. */
       if (f_reversesort) {
               if (!f_timesort)
                       sortfcn = revnamecmp;
               else if (f_accesstime)
                       sortfcn = revacccmp;
               else if (f_statustime)
                       sortfcn = revstatcmp;
               else /* Use modification time. */
                       sortfcn = revmodcmp;
       } else {
               if (!f_timesort)
                       sortfcn = namecmp;
               else if (f_accesstime)
                       sortfcn = acccmp;
               else if (f_statustime)
                       sortfcn = statcmp;
               else /* Use modification time. */
                       sortfcn = modcmp;
       }

       /* Select a print function. */
       if (f_singlecol)
               printfcn = printscol;
       else if (f_longform)
               printfcn = printlong;
       else
               printfcn = printcol;

       if (argc)
               traverse(argc, argv, fts_options);
       else
               traverse(1, dotav, fts_options);
       exit(0);
}

static int output;                      /* If anything output. */

/*
* Traverse() walks the logical directory structure specified by the argv list
* in the order specified by the mastercmp() comparison function.  During the
* traversal it passes linked lists of structures to display() which represent
* a superset (may be exact set) of the files to be displayed.
*/
static void
traverse(argc, argv, options)
       int argc, options;
       char *argv[];
{
       register FTS *ftsp;
       register FTSENT *p, *chp;
       int ch_options;

       if ((ftsp =
           fts_open(argv, options, f_nosort ? NULL : mastercmp)) == NULL)
               err(1, NULL);

       display(NULL, fts_children(ftsp, 0));
       if (f_listdir)
               return;

       /*
        * If not recursing down this tree and don't need stat info, just get
        * the names.
        */
       ch_options = !f_recursive && options & FTS_NOSTAT ? FTS_NAMEONLY : 0;

       while (p = fts_read(ftsp))
               switch (p->fts_info) {
               case FTS_DC:
                       warnx("%s: directory causes a cycle", p->fts_name);
                       break;
               case FTS_DNR:
               case FTS_ERR:
                       errno = p->fts_errno;
                       warn("%s", p->fts_name);
                       break;
               case FTS_D:
                       if (p->fts_level != FTS_ROOTLEVEL &&
                           p->fts_name[0] == '.' && !f_listdot)
                               break;

                       /*
                        * If already output something, put out a newline as
                        * a separator.  If multiple arguments, precede each
                        * directory with its name.
                        */
                       if (output)
                               (void)printf("\n%s:\n", p->fts_path);
                       else if (argc > 1) {
                               (void)printf("%s:\n", p->fts_path);
                               output = 1;
                       }

                       chp = fts_children(ftsp, ch_options);
                       display(p, chp);

                       if (!f_recursive && chp != NULL)
                               (void)fts_set(ftsp, p, FTS_SKIP);
                       break;
               }
       (void)fts_close(ftsp);
}

/*
* Display() takes a linked list of FTSENT structures and passes the list
* along with any other necessary information to the print function.  P
* points to the parent directory of the display list.
*/
static void
display(p, list)
       register FTSENT *p;
       FTSENT *list;
{
       register FTSENT *cur;
       struct stat *sp;
       DISPLAY d;
       NAMES *np;
       u_long btotal, maxblock, maxinode, maxlen, maxnlink;
       u_quad_t maxsize;
       int bcfile, flen, glen, ulen, maxflags, maxgroup, maxuser;
       int entries, needstats;
       char *user, *group, *flags, buf[20];    /* 32 bits == 10 digits */

       /*
        * If list is NULL there are two possibilities: that the parent
        * directory p has no children, or that fts_children() returned an
        * error.  We ignore the error case since it will be replicated
        * on the next call to fts_read() on the post-order visit to the
        * directory p, and will be signalled in traverse().
        */
       if (list == NULL)
               return;

       needstats = f_inode || f_longform || f_size;
       flen = 0;
       btotal = maxblock = maxinode = maxlen = maxnlink = 0;
       bcfile = 0;
       maxuser = maxgroup = maxflags = 0;
       maxsize = 0;
       for (cur = list, entries = 0; cur; cur = cur->fts_link) {
               if (cur->fts_info == FTS_ERR || cur->fts_info == FTS_NS) {
                       errno = cur->fts_errno;
                       warn("%s", cur->fts_name);
                       cur->fts_number = NO_PRINT;
                       continue;
               }

               /*
                * P is NULL if list is the argv list, to which different rules
                * apply.
                */
               if (p == NULL) {
                       /* Directories will be displayed later. */
                       if (cur->fts_info == FTS_D && !f_listdir) {
                               cur->fts_number = NO_PRINT;
                               continue;
                       }
               } else {
                       /* Only display dot file if -a/-A set. */
                       if (cur->fts_name[0] == '.' && !f_listdot) {
                               cur->fts_number = NO_PRINT;
                               continue;
                       }
               }
               if (f_nonprint)
                       prcopy(cur->fts_name, cur->fts_name, cur->fts_namelen);
               if (cur->fts_namelen > maxlen)
                       maxlen = cur->fts_namelen;
               if (needstats) {
                       sp = cur->fts_statp;
                       if (sp->st_blocks > maxblock)
                               maxblock = sp->st_blocks;
                       if (sp->st_ino > maxinode)
                               maxinode = sp->st_ino;
                       if (sp->st_nlink > maxnlink)
                               maxnlink = sp->st_nlink;
                       if (sp->st_size > maxsize)
                               maxsize = sp->st_size;

                       btotal += sp->st_blocks;
                       if (f_longform) {
                               user = user_from_uid(sp->st_uid, 0);
                               if ((ulen = strlen(user)) > maxuser)
                                       maxuser = ulen;
                               group = group_from_gid(sp->st_gid, 0);
                               if ((glen = strlen(group)) > maxgroup)
                                       maxgroup = glen;
                               if (f_flags) {
                                       flags =
                                           flags_to_string(sp->st_flags, "-");
                                       if ((flen = strlen(flags)) > maxflags)
                                               maxflags = flen;
                               } else
                                       flen = 0;

                               if ((np = malloc(sizeof(NAMES) +
                                   ulen + glen + flen + 3)) == NULL)
                                       err(1, NULL);

                               np->user = &np->data[0];
                               (void)strcpy(np->user, user);
                               np->group = &np->data[ulen + 1];
                               (void)strcpy(np->group, group);

                               if (S_ISCHR(sp->st_mode) ||
                                   S_ISBLK(sp->st_mode))
                                       bcfile = 1;

                               if (f_flags) {
                                       np->flags = &np->data[ulen + glen + 2];
                                       (void)strcpy(np->flags, flags);
                               }
                               cur->fts_pointer = np;
                       }
               }
               ++entries;
       }

       if (!entries)
               return;

       d.list = list;
       d.entries = entries;
       d.maxlen = maxlen;
       if (needstats) {
               d.bcfile = bcfile;
               d.btotal = btotal;
               (void)snprintf(buf, sizeof(buf), "%lu", maxblock);
               d.s_block = strlen(buf);
               d.s_flags = maxflags;
               d.s_group = maxgroup;
               (void)snprintf(buf, sizeof(buf), "%lu", maxinode);
               d.s_inode = strlen(buf);
               (void)snprintf(buf, sizeof(buf), "%lu", maxnlink);
               d.s_nlink = strlen(buf);
               (void)snprintf(buf, sizeof(buf), "%qu", maxsize);
               d.s_size = strlen(buf);
               d.s_user = maxuser;
       }

       printfcn(&d);
       output = 1;

       if (f_longform)
               for (cur = list; cur; cur = cur->fts_link)
                       free(cur->fts_pointer);
}

/*
* Ordering for mastercmp:
* If ordering the argv (fts_level = FTS_ROOTLEVEL) return non-directories
* as larger than directories.  Within either group, use the sort function.
* All other levels use the sort function.  Error entries remain unsorted.
*/
static int
mastercmp(a, b)
       const FTSENT **a, **b;
{
       register int a_info, b_info;

       a_info = (*a)->fts_info;
       if (a_info == FTS_ERR)
               return (0);
       b_info = (*b)->fts_info;
       if (b_info == FTS_ERR)
               return (0);

       if (a_info == FTS_NS || b_info == FTS_NS)
               return (namecmp(*a, *b));

       if (a_info == b_info)
               return (sortfcn(*a, *b));

       if ((*a)->fts_level == FTS_ROOTLEVEL)
               if (a_info == FTS_D)
                       return (1);
               else if (b_info == FTS_D)
                       return (-1);
               else
                       return (sortfcn(*a, *b));
       else
               return (sortfcn(*a, *b));
}