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[netbsd-mini2440.git] / external / gpl2 / xcvs / dist / src / ignore.c

/* This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.  */

/*
 * .cvsignore file support contributed by David G. Grubbs <dgg@odi.com>
 */

#include "cvs.h"
#include "getline.h"
#include "lstat.h"

/*
 * Ignore file section.
 * 
 *      "!" may be included any time to reset the list (i.e. ignore nothing);
 *      "*" may be specified to ignore everything.  It stays as the first
 *          element forever, unless a "!" clears it out.
 */

static char **ign_list;                 /* List of files to ignore in update
                                         * and import */
static char **s_ign_list = NULL;
static int ign_count;                   /* Number of active entries */
static int s_ign_count = 0;
static int ign_size;                    /* This many slots available (plus
                                         * one for a NULL) */
static int ign_hold = -1;               /* Index where first "temporary" item
                                         * is held */

const char *ign_default = ". .. core RCSLOG tags TAGS RCS SCCS .make.state\
 .nse_depinfo #* .#* cvslog.* ,* CVS.adm .del-* *.a *.olb *.o *.obj\
 *.so *.Z *~ *.old *.elc *.ln *.bak *.BAK *.orig *.rej *.exe _$* *$";
extern const char *cvsDir;

#define IGN_GROW 16                     /* grow the list by 16 elements at a
                                         * time */

/* Nonzero if we have encountered an -I ! directive, which means one should
   no longer ask the server about what is in CVSROOTADM_IGNORE.  */
int ign_inhibit_server;



/*
 * To the "ignore list", add the hard-coded default ignored wildcards above,
 * the wildcards found in $CVSROOT/CVSROOT/cvsignore, the wildcards found in
 * ~/.cvsignore and the wildcards found in the CVSIGNORE environment
 * variable.
 */
void
ign_setup (void)
{
    char *home_dir;
    char *tmp;

    ign_inhibit_server = 0;

    /* Start with default list and special case */
    tmp = xstrdup (ign_default);
    ign_add (tmp, 0);
    free (tmp);
    tmp = xstrdup (cvsDir);
    ign_add (tmp, 0);
    free (tmp);

    /* The client handles another way, by (after it does its own ignore file
       processing, and only if !ign_inhibit_server), letting the server
       know about the files and letting it decide whether to ignore
       them based on CVSROOOTADM_IGNORE.  */
    if (!current_parsed_root->isremote)
    {
        char *file = Xasprintf ("%s/%s/%s", current_parsed_root->directory,
                                CVSROOTADM, CVSROOTADM_IGNORE);
        /* Then add entries found in repository, if it exists */
        ign_add_file (file, 0);
        free (file);
    }

    /* Then add entries found in home dir, (if user has one) and file exists */
    home_dir = get_homedir ();
    /* If we can't find a home directory, ignore ~/.cvsignore.  This may
       make tracking down problems a bit of a pain, but on the other
       hand it might be obnoxious to complain when CVS will function
       just fine without .cvsignore (and many users won't even know what
       .cvsignore is).  */
    if (home_dir)
    {
        char *file = strcat_filename_onto_homedir (home_dir, CVSDOTIGNORE);
        ign_add_file (file, 0);
        free (file);
    }

    /* Then add entries found in CVSIGNORE environment variable. */
    ign_add (getenv (IGNORE_ENV), 0);

    /* Later, add ignore entries found in -I arguments */
}



/*
 * Open a file and read lines, feeding each line to a line parser. Arrange
 * for keeping a temporary list of wildcards at the end, if the "hold"
 * argument is set.
 */
void
ign_add_file (char *file, int hold)
{
    FILE *fp;
    char *line = NULL;
    size_t line_allocated = 0;

    /* restore the saved list (if any) */
    if (s_ign_list != NULL)
    {
        int i;

        for (i = 0; i < s_ign_count; i++)
            ign_list[i] = s_ign_list[i];
        ign_count = s_ign_count;
        ign_list[ign_count] = NULL;

        s_ign_count = 0;
        free (s_ign_list);
        s_ign_list = NULL;
    }

    /* is this a temporary ignore file? */
    if (hold)
    {
        /* re-set if we had already done a temporary file */
        if (ign_hold >= 0)
        {
            int i;

            for (i = ign_hold; i < ign_count; i++)
                free (ign_list[i]);
            ign_count = ign_hold;
            ign_list[ign_count] = NULL;
        }
        else
        {
            ign_hold = ign_count;
        }
    }

    /* load the file */
    fp = CVS_FOPEN (file, "r");
    if (fp == NULL)
    {
        if (! existence_error (errno))
            error (0, errno, "cannot open %s", file);
        return;
    }
    while (getline (&line, &line_allocated, fp) >= 0)
        ign_add (line, hold);
    if (ferror (fp))
        error (0, errno, "cannot read %s", file);
    if (fclose (fp) < 0)
        error (0, errno, "cannot close %s", file);
    free (line);
}



/* Parse a line of space-separated wildcards and add them to the list. */
void
ign_add (char *ign, int hold)
{
    if (!ign || !*ign)
        return;

    for (; *ign; ign++)
    {
        char *mark;
        char save;

        /* ignore whitespace before the token */
        if (isspace ((unsigned char) *ign))
            continue;

        /* If we have used up all the space, add some more.  Do this before
           processing `!', since an "empty" list still contains the `CVS'
           entry.  */
        if (ign_count >= ign_size)
        {
            ign_size += IGN_GROW;
            ign_list = xnrealloc (ign_list, ign_size + 1, sizeof (char *));
        }

        /*
         * if we find a single character !, we must re-set the ignore list
         * (saving it if necessary).  We also catch * as a special case in a
         * global ignore file as an optimization
         */
        if ((!*(ign+1) || isspace ((unsigned char) *(ign+1)))
            && (*ign == '!' || *ign == '*'))
        {
            if (!hold)
            {
                /* permanently reset the ignore list */
                int i;

                for (i = 0; i < ign_count; i++)
                    free (ign_list[i]);
                ign_count = 1;
                /* Always ignore the "CVS" directory.  */
                ign_list[0] = xstrdup ("CVS");
                ign_list[1] = NULL;

                /* if we are doing a '!', continue; otherwise add the '*' */
                if (*ign == '!')
                {
                    ign_inhibit_server = 1;
                    continue;
                }
            }
            else if (*ign == '!')
            {
                /* temporarily reset the ignore list */
                int i;

                if (ign_hold >= 0)
                {
                    for (i = ign_hold; i < ign_count; i++)
                        free (ign_list[i]);
                    ign_hold = -1;
                }
                if (s_ign_list)
                {
                    /* Don't save the ignore list twice - if there are two
                     * bangs in a local .cvsignore file then we don't want to
                     * save the new list the first bang created.
                     *
                     * We still need to free the "new" ignore list.
                     */
                    for (i = 0; i < ign_count; i++)
                        free (ign_list[i]);
                }
                else
                {
                    /* Save the ignore list for later.  */
                    s_ign_list = xnmalloc (ign_count, sizeof (char *));
                    for (i = 0; i < ign_count; i++)
                        s_ign_list[i] = ign_list[i];
                    s_ign_count = ign_count;
                }
                ign_count = 1;
                    /* Always ignore the "CVS" directory.  */
                ign_list[0] = xstrdup ("CVS");
                ign_list[1] = NULL;
                continue;
            }
        }

        /* find the end of this token */
        for (mark = ign; *mark && !isspace ((unsigned char) *mark); mark++)
             /* do nothing */ ;

        save = *mark;
        *mark = '\0';

        ign_list[ign_count++] = xstrdup (ign);
        ign_list[ign_count] = NULL;

        *mark = save;
        if (save)
            ign = mark;
        else
            ign = mark - 1;
    }
}



/* Return true if the given filename should be ignored by update or import,
 * else return false.
 */
int
ign_name (char *name)
{
    char **cpp = ign_list;

    if (cpp == NULL)
        return 0;

    while (*cpp)
        if (CVS_FNMATCH (*cpp++, name, 0) == 0)
            return 1;

    return 0;
}



/* FIXME: This list of dirs to ignore stuff seems not to be used.
   Really?  send_dirent_proc and update_dirent_proc both call
   ignore_directory and do_module calls ign_dir_add.  No doubt could
   use some documentation/testsuite work.  */

static char **dir_ign_list = NULL;
static int dir_ign_max = 0;
static int dir_ign_current = 0;

/* Add a directory to list of dirs to ignore.  */
void
ign_dir_add (char *name)
{
    /* Make sure we've got the space for the entry.  */
    if (dir_ign_current <= dir_ign_max)
    {
        dir_ign_max += IGN_GROW;
        dir_ign_list = xnrealloc (dir_ign_list,
                                  dir_ign_max + 1, sizeof (char *));
    }

    dir_ign_list[dir_ign_current++] = xstrdup (name);
}


/* Return nonzero if NAME is part of the list of directories to ignore.  */

int
ignore_directory (const char *name)
{
    int i;

    if (!dir_ign_list)
        return 0;

    i = dir_ign_current;
    while (i--)
    {
        if (strncmp (name, dir_ign_list[i], strlen (dir_ign_list[i])+1) == 0)
            return 1;
    }

    return 0;
}



/*
 * Process the current directory, looking for files not in ILIST and
 * not on the global ignore list for this directory.  If we find one,
 * call PROC passing it the name of the file and the update dir.
 * ENTRIES is the entries list, which is used to identify known
 * directories.  ENTRIES may be NULL, in which case we assume that any
 * directory with a CVS administration directory is known.
 */
void
ignore_files (List *ilist, List *entries, const char *update_dir,
              Ignore_proc proc)
{
    int subdirs;
    DIR *dirp;
    struct dirent *dp;
    struct stat sb;
    char *file;
    const char *xdir;
    List *files;
    Node *p;

    /* Set SUBDIRS if we have subdirectory information in ENTRIES.  */
    if (entries == NULL)
        subdirs = 0;
    else
    {
        struct stickydirtag *sdtp = entries->list->data;

        subdirs = sdtp == NULL || sdtp->subdirs;
    }

    /* we get called with update_dir set to "." sometimes... strip it */
    if (strcmp (update_dir, ".") == 0)
        xdir = "";
    else
        xdir = update_dir;

    dirp = CVS_OPENDIR (".");
    if (dirp == NULL)
    {
        error (0, errno, "cannot open current directory");
        return;
    }

    ign_add_file (CVSDOTIGNORE, 1);
    wrap_add_file (CVSDOTWRAPPER, 1);

    /* Make a list for the files.  */
    files = getlist ();

    while (errno = 0, (dp = CVS_READDIR (dirp)) != NULL)
    {
        file = dp->d_name;
        if (strcmp (file, ".") == 0 || strcmp (file, "..") == 0)
            continue;
        if (findnode_fn (ilist, file) != NULL)
            continue;
        if (subdirs)
        {
            Node *node;

            node = findnode_fn (entries, file);
            if (node != NULL
                && ((Entnode *) node->data)->type == ENT_SUBDIR)
            {
                char *p;
                int dir;

                /* For consistency with past behaviour, we only ignore
                   this directory if there is a CVS subdirectory.
                   This will normally be the case, but the user may
                   have messed up the working directory somehow.  */
                p = Xasprintf ("%s/%s", file, CVSADM);
                dir = isdir (p);
                free (p);
                if (dir)
                    continue;
            }
        }

        /* We could be ignoring FIFOs and other files which are neither
           regular files nor directories here.  */
        if (ign_name (file))
            continue;

        if (
#ifdef DT_DIR
            dp->d_type != DT_UNKNOWN ||
#endif
            lstat (file, &sb) != -1)
        {

            if (
#ifdef DT_DIR
                dp->d_type == DT_DIR
                || (dp->d_type == DT_UNKNOWN && S_ISDIR (sb.st_mode))
#else
                S_ISDIR (sb.st_mode)
#endif
                )
            {
                if (!subdirs)
                {
                    char *temp = Xasprintf ("%s/%s", file, CVSADM);
                    if (isdir (temp))
                    {
                        free (temp);
                        continue;
                    }
                    free (temp);
                }
            }
#ifdef S_ISLNK
            else if (
#ifdef DT_DIR
                     dp->d_type == DT_LNK
                     || (dp->d_type == DT_UNKNOWN && S_ISLNK (sb.st_mode))
#else
                     S_ISLNK (sb.st_mode)
#endif
                     )
            {
                continue;
            }
#endif
        }

        p = getnode ();
        p->type = FILES;
        p->key = xstrdup (file);
        (void) addnode (files, p);
    }
    if (errno != 0)
        error (0, errno, "error reading current directory");
    (void) CVS_CLOSEDIR (dirp);

    sortlist (files, fsortcmp);
    for (p = files->list->next; p != files->list; p = p->next)
        (*proc) (p->key, xdir);
    dellist (&files);
}