source: MondoRescue/branches/stable/mondo/src/common/libmondo-filelist.c@ 1080

/* libmondo-filelist.c
   $Id: libmondo-filelist.c 1080 2007-01-28 18:04:41Z bruno $
*/

/**
 * @file
 * Functions which create, chop, and edit the filelist.
 */

#include "my-stuff.h"
#include "mondostructures.h"
#include "lib-common-externs.h"
#include "libmondo-filelist.h"
#include "libmondo-string-EXT.h"
#include "libmondo-files-EXT.h"
#include "libmondo-fork-EXT.h"
#include "libmondo-gui-EXT.h"
#include "libmondo-tools-EXT.h"
#include "mr_str.h"
#include "mr_mem.h"

#include <time.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <errno.h>
#include <stdio.h>


/**
 * The maximum depth of directories to put in the skeleton filelist.
 * This is a balance between performance and a good progress indicator.
 */
#define MAX_SKEL_DEPTH 3


extern ssize_t getline(char **lineptr, size_t * n, FILE * stream);


int mondo_makefilelist(char *logfile, char *tmpdir, char *scratchdir,
                       char *include_paths, char *excp, int differential,
                       char *userdef_filelist);


/*@unused@*/
//static char cvsid[] = "$Id: libmondo-filelist.c 1080 2007-01-28 18:04:41Z bruno $";

/**
 * Number of lines in the filelist last loaded.
 * @warning This implies that two filesets cannot be loaded at once.
 * @ingroup globalGroup
 */
long g_original_noof_lines_in_filelist = 0;

/**
 * Number of filesets in the current backup.
 * @ingroup globalGroup
 */
long g_noof_sets = 0;

extern bool g_text_mode;
extern newtComponent g_progressForm;
extern int g_currentY;
extern int g_noof_rows;

extern char *g_getfacl;
extern char *g_getfattr;



/**
 * @addtogroup filelistGroup
 * @{
 */
/**
 * Call chop_filelist() to chop the filelist into sets.
 * @param bkpinfo The backup information structure. Fields used:
 * - @c bkpinfo->image_devs
 * - @c bkpinfo->optimal_set_size
 * - @c bkpinfo->scratchdir
 * - @c bkpinfo->tmpdir
 * @see chop_filelist
 */
int call_filelist_chopper(struct s_bkpinfo *bkpinfo)
{
    /*@ buffers *********************** */
    char *dev;
    char *filelist;
    char *tempfile;
    char *cksumlist;
    char *tmp;
    long noof_sets;

    /*@ pointers ********************** */
    char *ptr;
    FILE *fout;

    /*@ int *************************** */
    int i, retval = 0;

    malloc_string(dev);
    malloc_string(filelist);
    malloc_string(tempfile);
    malloc_string(cksumlist);
    malloc_string(tmp);
    mvaddstr_and_log_it(g_currentY, 0, "Dividing filelist into sets");

    log_to_screen("Dividing filelist into sets. Please wait.");
    i = 0;
    sprintf(filelist, "%s/archives/filelist.full", bkpinfo->scratchdir);
    sprintf(cksumlist, "%s/cklist.full", bkpinfo->tmpdir);
    if (!does_file_exist(filelist)) {
        log_it("filelist %s not found", filelist);
        fatal_error("call_filelist_chopper() -- filelist not found!");
    }

    noof_sets =
        chop_filelist(filelist, bkpinfo->tmpdir,
                      bkpinfo->optimal_set_size);
    estimate_noof_media_required(bkpinfo, noof_sets);   // for cosmetic purposes

    sprintf(tempfile, "%s/biggielist.txt", bkpinfo->tmpdir);
    if (!(fout = fopen(tempfile, "a"))) {
        log_OS_error("Cannot append to biggielist");
        retval++;
        goto end_of_func;
    }
    log_it(bkpinfo->image_devs);

    ptr = bkpinfo->image_devs;

    while (ptr && *ptr) {
        strcpy(dev, ptr);
        log_it("Examining imagedev %s", dev);
        for (i = 0; i < (int) strlen(dev) && dev[i] != ' '; i++);
        dev[i] = '\0';
        if (!strlen(dev)) {
            continue;
        }
        fprintf(fout, "%s\n", dev);
        log_it("Adding '%s' to biggielist", dev);
        if ((ptr = strchr(ptr, ' '))) {
            ptr++;
        }
    }
    paranoid_fclose(fout);
    mvaddstr_and_log_it(g_currentY++, 74, "Done.");

  end_of_func:
    mr_free(filelist);
    mr_free(tempfile);
    mr_free(cksumlist);
    mr_free(dev);
    mr_free(tmp);
    return (retval);
}



int sort_file(char *orig_fname)
{
    char *tmp_fname;
    char *command;
    int retval = 0;

    log_msg(1, "Sorting file %s", orig_fname);
    malloc_string(tmp_fname);
    malloc_string(command);
    sprintf(tmp_fname, "/tmp/sort.%d.%d.%d", (int) (random() % 32768),
            (int) (random() % 32768), (int) (random() % 32768));

    if (!does_file_exist(orig_fname)) {
        return (0);
    }                           // no sense in trying to sort an empty file

    sprintf(command, "sort %s > %s 2>> %s", orig_fname, tmp_fname,
            MONDO_LOGFILE);
    retval = system(command);
    if (retval) {
        log_msg(2, "Failed to sort %s - oh dear", orig_fname);
    } else {
        log_msg(2, "Sorted %s --> %s OK. Copying it back to %s now",
                orig_fname, tmp_fname, orig_fname);
        sprintf(command, "mv -f %s %s", tmp_fname, orig_fname);
        retval += run_program_and_log_output(command, 2);
        if (retval) {
            log_msg(2, "Failed to copy %s back to %s - oh dear", tmp_fname,
                    orig_fname);
        } else {
            log_msg(2, "%s was sorted OK.", orig_fname);
        }
    }
    mr_free(tmp_fname);
    mr_free(command);
    log_msg(1, "Finished sorting file %s", orig_fname);
    return (retval);
}



/**
 * Chop the filelist into sets.
 * Each fileset is a list of files whose total (uncompressed) size is usually
 * about X KB. Files bigger than 8X KB are placed in a "biggielist"; they will
 * be sliced and compressed separately from the regular files.
 *
 * @param filelist The big filelist (filelist.full) to chop up.
 * @param outdir The directory to place the files (filelist.N where N is
 * an integer, biggielist.txt, and LAST-FILELIST-NUMBER) created
 * @param maxsetsizeK Optimal size of a fileset (X above).
 * @return number of errors encountered (0 for success).
 */
int chop_filelist(char *filelist, char *outdir, long maxsetsizeK)
{
/*@ long ****************************************/
    long lino = 0;
    long max_sane_size_for_a_file;
    long curr_set_size;
    long noof_lines;
    long siz;

    /*@ int **************************************** */
    int i;
    long curr_set_no;

    /*@ buffers ************************************* */
    char *outfname;
    char *biggie_fname;
    char *incoming;
    char *tmp;
    char *acl_fname;
    char *xattr_fname;

    /*@ pointers *********************************** */
    FILE *fin;
    FILE *fout;
    FILE *fbig;

    /*@ structures ********************************* */
    struct stat buf;
    int err = 0;

    malloc_string(outfname);
    malloc_string(biggie_fname);
    incoming = mr_malloc(MAX_STR_LEN * 2);
    malloc_string(tmp);
    malloc_string(acl_fname);
    malloc_string(xattr_fname);

    assert_string_is_neither_NULL_nor_zerolength(filelist);
    assert_string_is_neither_NULL_nor_zerolength(outdir);
    assert(maxsetsizeK > 0);

    max_sane_size_for_a_file = 32L * 1024L;
// max_sane_size_for_a_file = maxsetsizeK*2;
//  if (max_sane_size_for_a_file > 32*1024)
//    { max_sane_size_for_a_file = 32*1024; }

    log_it("filelist=%s;", filelist);
    open_evalcall_form("Dividing filelist into sets");
    noof_lines = count_lines_in_file(filelist);
    if (!(fin = fopen(filelist, "r"))) {
        log_OS_error("Cannot openin filelist");
        return (0);
    }
    curr_set_no = 0;
    curr_set_size = 0;
    sprintf(outfname, "%s/filelist.%ld", outdir, curr_set_no);
    sprintf(biggie_fname, "%s/biggielist.txt", outdir);
    log_it("outfname=%s; biggie_fname=%s", outfname, biggie_fname);
    if (!(fbig = fopen(biggie_fname, "w"))) {
        log_OS_error("Cannot openout biggie_fname");
        err++;
        goto end_of_func;
    }
    if (!(fout = fopen(outfname, "w"))) {
        log_OS_error("Cannot openout outfname");
        err++;
        goto end_of_func;
    }
    (void) fgets(incoming, MAX_STR_LEN * 2 - 1, fin);
    while (!feof(fin)) {
        lino++;
        i = strlen(incoming) - 1;
        if (i < 0) {
            i = 0;
        }
        if (i > MAX_STR_LEN - 1) {
            incoming[MAX_STR_LEN - 30] = '\0';
            log_msg(1, "Warning - truncating file %s's name", incoming);
            err++;
        }
        if (incoming[i] < 32) {
            incoming[i] = '\0';
        }
        if (!strncmp(incoming, "/dev/", 5)) {
            siz = 1;
        } else if (lstat(incoming, &buf) != 0) {
            siz = 0;
        } else {
            siz = (long) (buf.st_size >> 10);
        }
        if (siz > max_sane_size_for_a_file)
// && strcmp(incoming+strlen(incoming)-4, ".bz2") && strcmp(incoming+strlen(incoming)-4, ".tbz"))
        {
            fprintf(fbig, "%s\n", incoming);
        } else {
            curr_set_size += siz;
            fprintf(fout, "%s\n", incoming);
            if (curr_set_size > maxsetsizeK) {
                paranoid_fclose(fout);
                sort_file(outfname);
                curr_set_no++;
                curr_set_size = 0;
                sprintf(outfname, "%s/filelist.%ld", outdir, curr_set_no);
                if (!(fout = fopen(outfname, "w"))) {
                    log_OS_error("Unable to openout outfname");
                    err++;
                    goto end_of_func;
                }
                sprintf(tmp, "Fileset #%ld chopped ", curr_set_no - 1);
                update_evalcall_form((int) (lino * 100 / noof_lines));
                /*              if (!g_text_mode) {newtDrawRootText(0,22,tmp);newtRefresh();} else {log_it(tmp);} */
            }
        }
        (void) fgets(incoming, MAX_STR_LEN * 2 - 1, fin);
    }
    paranoid_fclose(fin);
    paranoid_fclose(fout);
    paranoid_fclose(fbig);

    if (length_of_file(outfname) <= 2) {
        unlink(outfname);
        g_noof_sets--;
    }
    g_noof_sets = curr_set_no;
    sort_file(outfname);
    sort_file(biggie_fname);
    sprintf(outfname, "%s/LAST-FILELIST-NUMBER", outdir);
    sprintf(tmp, "%ld", curr_set_no);
    if (write_one_liner_data_file(outfname, tmp)) {
        log_OS_error
            ("Unable to echo write one-liner to LAST-FILELIST-NUMBER");
        err = 1;
    }
    if (curr_set_no == 0) {
        sprintf(tmp, "Only one fileset. Fine.");
    } else {
        sprintf(tmp, "Filelist divided into %ld sets", curr_set_no + 1);
    }
    log_msg(1, tmp);
    close_evalcall_form();
    /* This is to work around an obscure bug in Newt; open a form, close it,
       carry on... I don't know why it works but it works. If you don't do this
       then update_progress_form() won't show the "time taken / time remaining"
       line. The bug only crops up AFTER the call to chop_filelist(). Weird. */
#ifndef _XWIN
    if (!g_text_mode) {
        open_progress_form("", "", "", "", 100);
        newtPopHelpLine();
        newtFormDestroy(g_progressForm);
        newtPopWindow();
    }
#endif
  end_of_func:
    mr_free(outfname);
    mr_free(biggie_fname);
    mr_free(incoming);
    mr_free(tmp);
    mr_free(acl_fname);
    mr_free(xattr_fname);
    return (err ? 0 : curr_set_no + 1);
}





/**
 * Free all the memory used by a filelist structure.
 * Since this may take a long time for large filelists, a progress bar will be displayed.
 * @param filelist The filelist to free.
 */
void free_filelist(struct s_node *filelist)
{
    /*@ int's ******************************************************* */
    static int depth = 0;
    int percentage;

    /*@ long's ****************************************************** */
    static long i = 0;

    /*@ end vars **************************************************** */

    assert(filelist != NULL);
    if (depth == 0) {
        open_evalcall_form("Freeing memory");
        log_to_screen("Freeing memory formerly occupied by filelist");
    }
    depth++;

    if (filelist->ch == '\0') {
        if (!(i++ % 1111)) {
            percentage =
                (int) (i * 100 / g_original_noof_lines_in_filelist);
            update_evalcall_form(percentage);

        }
    }

    if (filelist->right) {
        free_filelist(filelist->right);
        filelist->right = NULL;
    }
    if (filelist->down) {
/*      if (!(i++ %39999)) { update_evalcall_form(0); } */
        free_filelist(filelist->down);
        filelist->down = NULL;
    }
    filelist->ch = '\0';
    mr_free(filelist);
    depth--;
    if (depth == 0) {
        close_evalcall_form();
        log_it("Finished freeing memory");
    }
}


int call_exe_and_pipe_output_to_fd(char *syscall, FILE * pout)
{
    FILE *pattr;
    char *tmp;
    pattr = popen(syscall, "r");
    if (!pattr) {
        log_msg(1, "Failed to open fattr() %s", syscall);
        return (1);
    }
    if (feof(pattr)) {
        log_msg(1, "Failed to call fattr() %s", syscall);
        paranoid_pclose(pattr);
        return (2);
    }
    malloc_string(tmp);
    for (fgets(tmp, MAX_STR_LEN, pattr); !feof(pattr);
         fgets(tmp, MAX_STR_LEN, pattr)) {
        fputs(tmp, pout);
    }
    paranoid_pclose(pattr);
    mr_free(tmp);
    return (0);
}



int gen_aux_list(char *filelist, char *syscall_sprintf,
                 char *auxlist_fname)
{
    FILE *fin;
    FILE *pout;
    char *pout_command;
    char *syscall;
    char *file_to_analyze;
    char *strtmp = NULL;
    int i;

    if (!(fin = fopen(filelist, "r"))) {
        log_msg(1, "Cannot openin filelist %s", filelist);
        return (1);
    }
    malloc_string(pout_command);
    sprintf(pout_command, "gzip -c1 > %s", auxlist_fname);
    if (!(pout = popen(pout_command, "w"))) {
        log_msg(1, "Cannot openout auxlist_fname %s", auxlist_fname);
        fclose(fin);
        mr_free(pout_command);
        return (4);
    }
    malloc_string(file_to_analyze);
    for (fgets(file_to_analyze, MAX_STR_LEN, fin); !feof(fin);
         fgets(file_to_analyze, MAX_STR_LEN, fin)) {
        i = strlen(file_to_analyze);
        if (i > 0 && file_to_analyze[i - 1] < 32) {
            file_to_analyze[i - 1] = '\0';
        }
        log_msg(8, "Analyzing %s", file_to_analyze);
        asprintf(&strtmp, syscall_sprintf, mr_stresc(file_to_analyze, "`$\\\"", '\\'));
        asprintf(&syscall, "%s 2>> /dev/null", strtmp); // " MONDO_LOGFILE);
        mr_free(strtmp);
        call_exe_and_pipe_output_to_fd(syscall, pout);
        mr_free(syscall);
    }
    paranoid_fclose(fin);
    paranoid_pclose(pout);
    mr_free(file_to_analyze);
    mr_free(pout_command);
    return (0);
}


int get_acl_list(char *filelist, char *facl_fname)
{
    char *command;
    int retval = 0;

    if (g_getfacl != NULL) {
        malloc_string(command);
        sprintf(command, "touch %s", facl_fname);
        run_program_and_log_output(command, 8);
//      sort_file(filelist); // FIXME - filelist chopper sorts, so this isn't necessary
        sprintf(command,
                "getfacl --all-effective -P %s 2>> %s | gzip -c1 > %s 2>> %s",
                filelist, MONDO_LOGFILE, facl_fname, MONDO_LOGFILE);
        iamhere(command);
        retval = system(command);
        mr_free(command);
    }
    return (retval);
}


int get_fattr_list(char *filelist, char *fattr_fname)
{
    char *command;
    int retval = 0;

    if (g_getfattr != NULL) {
        malloc_string(command);
        sprintf(command, "touch %s", fattr_fname);
        run_program_and_log_output(command, 8);
        mr_free(command);
//      sort_file(filelist); // FIXME - filelist chopper sorts, so this isn't necessary
        retval =
            gen_aux_list(filelist, "getfattr --en=hex -P -d \"%s\"",
                         fattr_fname);
    }
    return (retval);
}


int set_EXAT_list(char *orig_msklist, char *original_exat_fname,
                  char *executable)
{
    const int my_depth = 8;
    char *command, *syscall_pin, *syscall_pout, *incoming;
    char *current_subset_file, *current_master_file, *masklist;
    int retval = 0;
    int i;
    char *p, *q;
    FILE *pin, *pout, *faclin;

    malloc_string(command);
    log_msg(1, "set_EXAT_list(%s, %s, %s)", orig_msklist,
            original_exat_fname, executable);
    if (!orig_msklist || !orig_msklist[0]
        || !does_file_exist(orig_msklist)) {
        log_msg(1,
                "No masklist provided. I shall therefore set ALL attributes.");
        sprintf(command, "gzip -dc %s | %s --restore - 2>> %s",
                original_exat_fname, executable, MONDO_LOGFILE);
        log_msg(1, "command = %s", command);
        retval = system(command);
        mr_free(command);
        log_msg(1, "Returning w/ retval=%d", retval);
        return (retval);
    }
    if (length_of_file(original_exat_fname) <= 0) {
        log_msg(1,
                "original_exat_fname %s is empty or missing, so no need to set EXAT list",
                original_exat_fname);
        mr_free(command);
        return (0);
    }
    malloc_string(incoming);
    malloc_string(masklist);
    malloc_string(current_subset_file);
    malloc_string(current_master_file);
    malloc_string(syscall_pin);
    malloc_string(syscall_pout);
    sprintf(masklist, "/tmp/%d.%d.mask", (int) (random() % 32768),
            (int) (random() % 32768));
    sprintf(command, "cp -f %s %s", orig_msklist, masklist);
    run_program_and_log_output(command, 1);
    sort_file(masklist);
    current_subset_file[0] = current_master_file[0] = '\0';
    sprintf(syscall_pin, "gzip -dc %s", original_exat_fname);
    sprintf(syscall_pout, "%s --restore - 2>> %s", executable,
            MONDO_LOGFILE);

    log_msg(1, "syscall_pin = %s", syscall_pin);
    log_msg(1, "syscall_pout = %s", syscall_pout);
    pout = popen(syscall_pout, "w");
    if (!pout) {
        iamhere("Unable to openout to syscall_pout");
        return (1);
    }
    pin = popen(syscall_pin, "r");
    if (!pin) {
        pclose(pout);
        iamhere("Unable to openin from syscall");
        return (1);
    }
    faclin = fopen(masklist, "r");
    if (!faclin) {
        pclose(pin);
        pclose(pout);
        iamhere("Unable to openin masklist");
        return (1);
    }
//  printf("Hi there. Starting the loop\n");

    fgets(current_subset_file, MAX_STR_LEN, faclin);
    fgets(incoming, MAX_STR_LEN, pin);
    while (!feof(pin) && !feof(faclin)) {
//      printf("incoming = %s", incoming);

        strcpy(current_master_file, incoming + 8);

        p = current_subset_file;
        if (*p == '/') {
            p++;
        }
        i = strlen(p);
        if (i > 0 && p[i - 1] < 32) {
            p[i - 1] = '\0';
        }


        q = current_master_file;
        if (*q == '/') {
            q++;
        }
        i = strlen(q);
        if (i > 0 && q[i - 1] < 32) {
            q[i - 1] = '\0';
        }

        i = strcmp(p, q);
        log_msg(my_depth, "'%s' v '%s' --> %d\n", p, q, i);

//      printf("%s v %s --> %d\n", p, q, i);

        if (i < 0) {            // read another subset file in.
            log_msg(my_depth, "Reading next subset line in\n\n");
            fgets(current_subset_file, MAX_STR_LEN, faclin);
            continue;
        }

        if (!i) {
            fputs(incoming, pout);
        }
        fgets(incoming, MAX_STR_LEN, pin);
        if (!i) {
            log_msg(my_depth, "Copying master %s", q);
        }
//      if (!i) { printf("Match --- %s\n", q); }

        while (!feof(pin) && strncmp(incoming, "# file: ", 8)) {
            if (!i) {

//    printf("%s", incoming);

                fputs(incoming, pout);
            }
            fgets(incoming, MAX_STR_LEN, pin);
        }
        if (!i) {
            fgets(current_subset_file, MAX_STR_LEN, faclin);
        }
    }
    while (!feof(pin)) {
        fgets(incoming, MAX_STR_LEN, pin);
    }
    fclose(faclin);
    pclose(pin);
    pclose(pout);

//  printf("OK, loop is done\n");

    unlink(masklist);
    mr_free(current_subset_file);
    mr_free(current_master_file);
    mr_free(syscall_pout);
    mr_free(syscall_pin);
    mr_free(masklist);
    mr_free(incoming);
    mr_free(command);
    return (retval);
}


int set_fattr_list(char *masklist, char *fattr_fname)
{
    if (find_home_of_exe("setfattr")) {
        return (set_EXAT_list(masklist, fattr_fname, "setfattr"));
    } else {
        log_msg(1, "ERROR: set_EXAT_list: setfattr doesn't exist");
        return(0);
    }
}



int set_acl_list(char *masklist, char *acl_fname)
{
    if (find_home_of_exe("setfacl")) {
        return (set_EXAT_list(masklist, acl_fname, "setfacl"));
    } else {
        log_msg(1, "ERROR: set_EXAT_list: setfacl doesn't exist");
        return(0);
    }
}


/**
 * Get the number of the last fileset in the backup.
 * @param bkpinfo The backup information structure. Only the @c bkpinfo->tmpdir field is used.
 * @return The last filelist number.
 * @note This function should only be called at restore-time.
 */
int get_last_filelist_number(struct s_bkpinfo *bkpinfo)
{
    /*@ buffers ***************************************************** */
    char val_sz[MAX_STR_LEN];
    char cfg_fname[MAX_STR_LEN];
/*  char tmp[MAX_STR_LEN]; remove stan benoit apr 2002 */

    /*@ long ******************************************************** */
    int val_i;

    /*@ end vars **************************************************** */

    assert(bkpinfo != NULL);

    sprintf(cfg_fname, "%s/mondo-restore.cfg", bkpinfo->tmpdir);
    read_cfg_var(cfg_fname, "last-filelist-number", val_sz);
    val_i = atoi(val_sz);
    if (val_i <= 0) {
        val_i = 500;
    }
    return (val_i);
}


/**
 * Add a string at @p startnode.
 * @param startnode The node to start at when searching for where to add the string.
 * @param string_to_add The string to add.
 * @return 0 for success, 1 for failure.
 * @bug I don't understand this function. Would someone care to explain it?
 */
int add_string_at_node(struct s_node *startnode, char *string_to_add)
{


    /*@ int ******************************************************** */
    int noof_chars;
    int i;
    int res;

    /*@ sturctures ************************************************* */
    struct s_node *node, *newnode;

    /*@ char  ****************************************************** */
    char char_to_add;

    /*@ bools ****************************************************** */

    const bool sosodef = FALSE;

    static int depth = 0;
    static char original_string[MAX_STR_LEN];

    assert(startnode != NULL);
    assert(string_to_add != NULL);

    if (!depth) {
        strcpy(original_string, string_to_add);
    }

    noof_chars = strlen(string_to_add) + 1; /* we include the '\0' */

/* walk across tree if necessary */
    node = startnode;
    char_to_add = string_to_add[0];
    if (node->right != NULL && node->ch < char_to_add) {
        log_msg(7, "depth=%d --- going RIGHT ... %c-->%c", depth,
                char_to_add, node->ch, (node->right)->ch);
        return (add_string_at_node(node->right, string_to_add));
    }

/* walk down tree if appropriate */
    if (node->down != NULL && node->ch == char_to_add) {
        log_msg(7, "depth=%d char=%c --- going DOWN", depth, char_to_add);
        depth++;
        res = add_string_at_node(node->down, string_to_add + 1);
        depth--;
        return (res);
    }

    if (char_to_add == '\0' && node->ch == '\0') {
        log_msg(6, "%s already in tree", original_string);
        return (1);
    }

/* add here */
    newnode = (struct s_node *) mr_malloc(sizeof(struct s_node));
    if (char_to_add < node->ch) // add to the left of node
    {
        log_msg(7, "depth=%d char=%c --- adding (left)", depth,
                char_to_add);
        memcpy((void *) newnode, (void *) node, sizeof(struct s_node));
        node->right = newnode;
    } else if (char_to_add > node->ch)  // add to the right of node
    {
        log_msg(7, "depth=%d char=%c --- adding (right)", depth,
                char_to_add);
        newnode->right = node->right;   // newnode is to the RIGHT of node
        node->right = newnode;
        node = newnode;
    }
    // from now on, we're working on 'node'
    node->down = NULL;
    node->ch = char_to_add;
    node->expanded = node->selected = FALSE;
    if (char_to_add == '\0') {
        log_msg(6, "Added %s OK", original_string);
        return (0);
    }
// add the rest
    log_msg(6, "Adding remaining chars ('%s')", string_to_add + 1);
    for (i = 1; i < noof_chars; i++) {
            node->down = (struct s_node *) mr_malloc(sizeof(struct s_node));
        }
        node = node->down;
        char_to_add = string_to_add[i];
        log_msg(6, "Adding '%c'", char_to_add);
        node->ch = char_to_add;
        node->right = node->down = NULL;
        node->expanded = node->selected = FALSE;
        if (!node->ch) {
            node->selected = sosodef;
        }
    }
    log_msg(6, "Finally - added %s OK", original_string);
    return (0);
}




/**
 * Load a filelist into a <tt>struct s_node</tt>.
 * When you are done with the filelist, call free_filelist().
 * @param filelist_fname The file to load the filelist from.
 * @return A filelist tree structure.
 */
struct s_node *load_filelist(char *filelist_fname)
{

    /*@ structures ************************************************* */
    struct s_node *filelist;

    /*@ pointers *************************************************** */
    FILE *pin;

    /*@ buffers **************************************************** */
    char command_to_open_fname[MAX_STR_LEN];
    char fname[MAX_STR_LEN];
    char tmp[MAX_STR_LEN];
    int pos_in_fname;
    /*@ int ******************************************************** */
    int percentage;

    /*@ long ******************************************************* */
    long lines_in_filelist;
    long lino = 0;
    /*@ end vars *************************************************** */

    assert_string_is_neither_NULL_nor_zerolength(filelist_fname);

    if (!does_file_exist(filelist_fname)) {
        fatal_error("filelist does not exist -- cannot load it");
    }
    log_to_screen("Loading filelist");
    sprintf(command_to_open_fname, "gzip -dc %s", filelist_fname);
    sprintf(tmp, "zcat %s | wc -l", filelist_fname);
    log_msg(6, "tmp = %s", tmp);
    lines_in_filelist =
        atol(call_program_and_get_last_line_of_output(tmp));
    if (lines_in_filelist < 3) {
        log_to_screen("Warning - surprisingly short filelist.");
    }
    g_original_noof_lines_in_filelist = lines_in_filelist;
    filelist = (struct s_node *) mr_malloc(sizeof(struct s_node));
    filelist->ch = '/';
    filelist->right = NULL;
    filelist->down = mr_malloc(sizeof(struct s_node));
    filelist->expanded = filelist->selected = FALSE;
    (filelist->down)->ch = '\0';
    (filelist->down)->right = (filelist->down)->down = FALSE;
    (filelist->down)->expanded = (filelist->down)->selected = FALSE;
    if (!(pin = popen(command_to_open_fname, "r"))) {
        log_OS_error("Unable to openin filelist_fname");
        return (NULL);
    }
    open_evalcall_form("Loading filelist from disk");
    for (fgets(fname, MAX_STR_LEN, pin); !feof(pin);
         fgets(fname, MAX_STR_LEN, pin)) {
        if ((fname[strlen(fname) - 1] == 13
             || fname[strlen(fname) - 1] == 10) && strlen(fname) > 0) {
            fname[strlen(fname) - 1] = '\0';
        }
//      strip_spaces (fname);
        if (!strlen(fname)) {
            continue;
        }
        for (pos_in_fname = 0; fname[pos_in_fname] != '\0'; pos_in_fname++) {
            if (fname[pos_in_fname] != '/') {
                continue;
            }
            strcpy(tmp, fname);
            tmp[pos_in_fname] = '\0';
            if (strlen(tmp)) {
                add_string_at_node(filelist, tmp);
            }
        }
        add_string_at_node(filelist, fname);
        if (!(++lino % 1111)) {
            percentage = (int) (lino * 100 / lines_in_filelist);
            update_evalcall_form(percentage);
        }
    }
    paranoid_pclose(pin);
    close_evalcall_form();
    log_it("Finished loading filelist");
    return (filelist);
}


/**
 * Log a list of files in @p node.
 * @param node The toplevel node to use.
 */
void show_filelist(struct s_node *node)
{
    static int depth = 0;
    static char current_string[200];

    if (depth == 0) {
        log_msg(0, "----------------show filelist--------------");
    }
    current_string[depth] = node->ch;

    log_msg(3, "depth=%d", depth);
    if (node->down) {
        log_msg(3, "moving down");
        depth++;
        show_filelist(node->down);
        depth--;
    }

    if (!node->ch) {
        log_msg(0, "%s\n", current_string);
    }

    if (node->right) {
        log_msg(3, "moving right");
        show_filelist(node->right);
    }
    if (depth == 0) {
        log_msg(0, "----------------show filelist--------------");
    }
    return;
}




/**
 * Reset the filelist to the state it was when it was loaded. This does not
 * touch the file on disk.
 * @param filelist The filelist tree structure.
 */
void reload_filelist(struct s_node *filelist)
{
    assert(filelist != NULL);
    toggle_node_selection(filelist, FALSE);
    toggle_path_expandability(filelist, "/", FALSE);
    toggle_all_root_dirs_on(filelist);
}



/**
 * Save a filelist tree structure to disk.
 * @param filelist The filelist tree structure to save.
 * @param outfname Where to save it.
 */
void save_filelist(struct s_node *filelist, char *outfname)
{
    /*@ int ********************************************************* */
    static int percentage;
    static int depth = 0;

    /*@ buffers ***************************************************** */
    static char str[MAX_STR_LEN];

    /*@ structures ************************************************** */
    struct s_node *node;

    /*@ pointers **************************************************** */
    static FILE *fout = NULL;

    /*@ long ******************************************************** */
    static long lines_in_filelist = 0;
    static long lino = 0;

    /*@ end vars *************************************************** */

    assert(filelist != NULL);
    assert(outfname != NULL);   // will be zerolength if save_filelist() is called by itself
    if (depth == 0) {
        log_to_screen("Saving filelist");
        if (!(fout = fopen(outfname, "w"))) {
            fatal_error("Cannot openout/save filelist");
        }
        lines_in_filelist = g_original_noof_lines_in_filelist;  /* set by load_filelist() */
        open_evalcall_form("Saving selection to disk");
    }
    for (node = filelist; node != NULL; node = node->right) {
        str[depth] = node->ch;
        log_msg(5, "depth=%d ch=%c", depth, node->ch);
        if (!node->ch) {
//    if (node->selected)
//      {
            fprintf(fout, "%s\n", str);
//      }
            if (!(++lino % 1111)) {
                percentage = (int) (lino * 100 / lines_in_filelist);
                update_evalcall_form(percentage);
            }
        }
        if (node->down) {
            depth++;
            save_filelist(node->down, "");
            depth--;
        }
    }
    if (depth == 0) {
        paranoid_fclose(fout);
        close_evalcall_form();
        log_it("Finished saving filelist");
    }
}



/**
 * Toggle all root dirs on.
 * @param filelist The filelist tree structure to operate on.
 * @bug I don't understand this function. Would someone care to explain it?
 */
void toggle_all_root_dirs_on(struct s_node *filelist)
{
    /*@ structures ************************************************** */
    struct s_node *node;

    /*@ int ********************************************************* */
    static int depth = 0;
    static int root_dirs_expanded;

    /*@ buffers ***************************************************** */
    static char filename[MAX_STR_LEN];

    /*@ end vars *************************************************** */

    assert(filelist != NULL);
    if (depth == 0) {
        log_it("Toggling all root dirs ON");
        root_dirs_expanded = 0;
    }
    for (node = filelist; node != NULL; node = node->right) {
        filename[depth] = node->ch;
        if (node->ch == '\0' && strlen(filename) > 1
            && (!strchr(filename + 1, '/'))) {
            node->selected = FALSE;
            node->expanded = TRUE;
//    log_it (filename);
            root_dirs_expanded++;
        }
        if (node->down) {
            depth++;
            toggle_all_root_dirs_on(node->down);
            depth--;
        }
    }
    if (depth == 0) {
        log_it("Finished toggling all root dirs ON");
    }
}


/**
 * Toggle the expandability of a path.
 * @param filelist The filelist tree to operate on.
 * @param pathname The path to toggle expandability of.
 * @param on_or_off Whether to toggle it on or off.
 * @bug I don't understand this function. Would someone care to explain it?
 */
void
toggle_path_expandability(struct s_node *filelist, char *pathname,
                          bool on_or_off)
{

    /*@ int ******************************************************** */
    static int depth = 0;
    static int total_expanded;
    static int root_depth;
    int j;
    /*@ structures ************************************************* */
    struct s_node *node;

    /*@ buffers **************************************************** */
    static char current_filename[MAX_STR_LEN];

/*  char tmp[MAX_STR_LEN+2]; */

    /*@ end vars *************************************************** */

    assert(filelist != NULL);
    assert_string_is_neither_NULL_nor_zerolength(pathname);
    if (depth == 0) {
        total_expanded = 0;
//      log_it ("Toggling path's expandability");
        for (root_depth = (int) strlen(pathname);
             root_depth > 0 && pathname[root_depth - 1] != '/';
             root_depth--);
        if (root_depth < 2) {
            root_depth = (int) strlen(pathname);
        }
    }
    for (node = filelist; node != NULL; node = node->right) {
        current_filename[depth] = node->ch;
        if (node->down) {
            depth++;
            toggle_path_expandability(node->down, pathname, on_or_off);
            depth--;
        }
        if (node->ch == '\0') {
            if (!strncmp(pathname, current_filename, strlen(pathname))) {
                for (j = root_depth;
                     current_filename[j] != '/'
                     && current_filename[j] != '\0'; j++);
                if (current_filename[j] != '\0') {
                    for (j++;
                         current_filename[j] != '/'
                         && current_filename[j] != '\0'; j++);
                }
                if (current_filename[j] == '\0') {
                    node->expanded =
                        (!strcmp(pathname, current_filename) ? TRUE :
                         on_or_off);
                }
            }
        }
        if (node->expanded) {
            if (total_expanded < ARBITRARY_MAXIMUM - 32
                || !strrchr(current_filename + strlen(pathname), '/')) {
                total_expanded++;
            } else {
                node->expanded = FALSE;
            }
        }
    }
    if (depth == 0) {
//      log_it ("Finished toggling expandability");
    }
}

/**
 * Toggle whether a path is selected.
 * @param filelist The filelist tree to operate on.
 * @param pathname The path to toggle selection of.
 * @param on_or_off Whether to toggle it on or off.
 * @bug I don't understand this function. Would someone care to explain it?
 */
void
toggle_path_selection(struct s_node *filelist, char *pathname,
                      bool on_or_off)
{
    /*@ int ********************************************************* */
    static int depth = 0;
    int j;

    /*@ structures ************************************************** */
    struct s_node *node;

    /*@ buffers ***************************************************** */
    static char current_filename[MAX_STR_LEN];
    char tmp[MAX_STR_LEN + 2];

    /*@ end vars *************************************************** */
    assert(filelist != NULL);
    assert_string_is_neither_NULL_nor_zerolength(pathname);
    if (depth == 0) {
        log_it("Toggling path's selection");
    }
    for (node = filelist; node != NULL; node = node->right) {
        current_filename[depth] = node->ch;
        if (node->down) {
            depth++;
            toggle_path_selection(node->down, pathname, on_or_off);
            depth--;
        }
        if (node->ch == '\0') {
            if (!strncmp(pathname, current_filename, strlen(pathname))) {
                for (j = 0;
                     pathname[j] != '\0'
                     && pathname[j] == current_filename[j]; j++);
                if (current_filename[j] == '/'
                    || current_filename[j] == '\0') {
                    node->selected = on_or_off;
                    sprintf(tmp, "%s is now %s\n", current_filename,
                            (on_or_off ? "ON" : "OFF"));
                }
            }
        }
    }
    if (depth == 0) {
        log_it("Finished toggling selection");
    }
}


/**
 * Toggle node selection of a filelist tree.
 * @param filelist The filelist tree to operate on.
 * @param on_or_off Whether to toggle selection on or off.
 * @bug I don't understand this function. Would someone care to explain it?
 */
void toggle_node_selection(struct s_node *filelist, bool on_or_off)
{
    /*@ structure ************************************************** */
    struct s_node *node;

    /*@ end vars *************************************************** */
    assert(filelist != NULL);
    for (node = filelist; node != NULL; node = node->right) {
        if (node->ch == '/') {
            continue;
        }                       /* don't go deep */
        if (node->ch == '\0') {
            node->selected = on_or_off;
        }
        if (node->down) {
            toggle_node_selection(node->down, on_or_off);
        }
    }
}







/**
 * The pathname to the skeleton filelist, used to give better progress reporting for mondo_makefilelist().
 */
char *g_skeleton_filelist = NULL;

/**
 * Number of entries in the skeleton filelist.
 */
long g_skeleton_entries = 0;

/**
 * Wrapper around mondo_makefilelist().
 * @param bkpinfo The backup information structure. Fields used:
 * - @c bkpinfo->differential
 * - @c bkpinfo->exclude_paths
 * - @c bkpinfo->include_paths
 * - @c bkpinfo->make_filelist
 * - @c bkpinfo->scratchdir
 * - @c bkpinfo->tmpdir
 * @return 0 for success, nonzero for failure.
 * @see mondo_makefilelist
 */
int prepare_filelist(struct s_bkpinfo *bkpinfo)
{

    /*@ int **************************************************** */
    int res = 0;

    assert(bkpinfo != NULL);
    log_it("tmpdir=%s; scratchdir=%s", bkpinfo->tmpdir,
           bkpinfo->scratchdir);
    if (bkpinfo->make_filelist) {
        mvaddstr_and_log_it(g_currentY, 0,
                            "Making catalog of files to be backed up");
    } else {
        mvaddstr_and_log_it(g_currentY, 0,
                            "Using supplied catalog of files to be backed up");
    }

    if (bkpinfo->make_filelist) {
        res =
            mondo_makefilelist(MONDO_LOGFILE, bkpinfo->tmpdir,
                               bkpinfo->scratchdir, bkpinfo->include_paths,
                               bkpinfo->exclude_paths,
                               bkpinfo->differential, NULL);
    } else {
        res =
            mondo_makefilelist(MONDO_LOGFILE, bkpinfo->tmpdir,
                               bkpinfo->scratchdir, NULL,
                               bkpinfo->exclude_paths,
                               bkpinfo->differential,
                               bkpinfo->include_paths);
    }

    if (res) {
        log_OS_error("Call to mondo_makefilelist failed");
        mvaddstr_and_log_it(g_currentY++, 74, "Failed.");
    } else {
        mvaddstr_and_log_it(g_currentY++, 74, "Done.");
    }
    return (res);
}


/**
 * Recursively list all files in @p dir newer than @p time_of_last_full_backup to @p fout.
 * @param dir The directory to list to @p fout.
 * @param sth The directories to skip (exclude).
 * @param fout The file to write everything to.
 * @param time_of_last_full_backup Only backup files newer than this (0 to disable).
 * @return 0, always.
 * @bug Return value should be @c void.
 */
int open_and_list_dir(char *dir, char *sth, FILE * fout,
                      time_t time_of_last_full_backup)
{
    const char delims[] = " ";

    DIR *dip;
    struct dirent *dit;
    struct stat statbuf;
    char new[MAX_STR_LEN];
    char *tmp;
    char *sth_B;
    static int percentage = 0;
    char *ith_B;
    char *skip_these;
    char *new_with_spaces;
    char *strtmp;
    char *token;
    char *find_excludes;
    static char *name_of_evalcall_form;
    int i;
    int lastpos = 0;
    static int depth = 0;
    char *p;
    static int counter = 0;
    static int uberctr = 0;
    static char *find_skeleton_marker;
    static long skeleton_lino = 0;
    static time_t last_time = 0;
    time_t this_time;

    malloc_string(tmp);
    malloc_string(sth_B);
    malloc_string(ith_B);
    malloc_string(new_with_spaces);
    p = strrchr(dir, '/');
    if (p) {
        if (!strcmp(p, "/.") || !strcmp(p, "/..")) {
            return (0);
        }
    }

    if (!depth) {
        malloc_string(name_of_evalcall_form);
        malloc_string(find_skeleton_marker);
        asprintf(&find_excludes, " ");
        while((token = mr_strtok (sth, delims, &lastpos))) {
          asprintf(&strtmp,"%s", find_excludes);
          mr_free(find_excludes);
          asprintf(&find_excludes,"%s -path %s -prune -o", strtmp, token);
          mr_free(strtmp);
          mr_free(token);
        }
#if linux
        // 2.6 has /sys as a proc-type thing -- must be excluded
        asprintf(&strtmp,
             "find %s -maxdepth %d -fstype mvfs -prune -o -path /dev/shm -prune -o %s -type d -print > %s 2> /dev/null",
             dir, MAX_SKEL_DEPTH, find_excludes, g_skeleton_filelist);
#else
        // On BSD, for example, /sys is the kernel sources -- don't exclude
        asprintf(&strtmp,
             "find %s -maxdepth %d -fstype mvfs -prune -o -path /proc -prune -o %s -type d -print > %s 2> /dev/null",
                dir, MAX_SKEL_DEPTH, find_excludes, g_skeleton_filelist);
#endif
        mr_free(find_excludes);
        log_msg(5, "find command = %s", strtmp);
        system(strtmp);
        mr_free(strtmp);
        sprintf(tmp, "wc -l %s | awk '{print $1;}'", g_skeleton_filelist);
        g_skeleton_entries =
            1 + atol(call_program_and_get_last_line_of_output(tmp));
        sprintf(name_of_evalcall_form, "Making catalog of %s", dir);
        open_evalcall_form(name_of_evalcall_form);
        find_skeleton_marker[0] = '\0';
        skeleton_lino = 1;
        log_msg(5, "entries = %ld", g_skeleton_entries);
        percentage = 0;
    } else if (depth <= MAX_SKEL_DEPTH) // update evalcall form if appropriate
    {
        sprintf(find_skeleton_marker,
                "grep -Fv \"%s\" %s > %s.new 2> /dev/null", dir,
                g_skeleton_filelist, g_skeleton_filelist);
//    log_msg(0, "fsm = %s", find_skeleton_marker);
        if (!system(find_skeleton_marker)) {
            percentage = (int) (skeleton_lino * 100 / g_skeleton_entries);
            skeleton_lino++;
//        log_msg(5, "Found %s", dir);
//        log_msg(2, "Incrementing skeleton_lino; now %ld/%ld (%d%%)", skeleton_lino, g_skeleton_entries, percentage);
            sprintf(find_skeleton_marker, "mv -f %s.new %s",
                    g_skeleton_filelist, g_skeleton_filelist);
//        log_msg(6, "fsm = %s", find_skeleton_marker);
            run_program_and_log_output(find_skeleton_marker, 8);
            time(&this_time);
            if (this_time != last_time) {
                last_time = this_time;
#ifndef _XWIN
                if (!g_text_mode) {
                    sprintf(tmp, "Reading %-68s", dir);
                    newtDrawRootText(0, g_noof_rows - 3, tmp);
                }
#endif
                update_evalcall_form(percentage);
            }
        }
    }

    depth++;

//  log_msg(0, "Cataloguing %s", dir);
    if (sth[0] == ' ') {
        skip_these = sth;
    } else {
        skip_these = sth_B;
        sprintf(skip_these, " %s ", sth);
    }
    sprintf(new_with_spaces, " %s ", dir);
    if ((dip = opendir(dir)) == NULL) {
        log_OS_error("opendir");
    } else if (strstr(skip_these, new_with_spaces)) {
        fprintf(fout, "%s\n", dir); // if excluded dir then print dir ONLY
    } else {
        fprintf(fout, "%s\n", dir);
        while ((dit = readdir(dip)) != NULL) {
            i++;
            strcpy(new, dir);
            if (strcmp(dir, "/")) {
                strcat(new, "/");
            }
            strcat(new, dit->d_name);
            new_with_spaces[0] = ' ';
            strcpy(new_with_spaces + 1, new);
            strcat(new_with_spaces, " ");
            if (strstr(skip_these, new_with_spaces)) {
                fprintf(fout, "%s\n", new);
            } else {
                if (!lstat(new, &statbuf)) {
                    if (!S_ISLNK(statbuf.st_mode)
                        && S_ISDIR(statbuf.st_mode)) {
                        open_and_list_dir(new, skip_these, fout,
                                          time_of_last_full_backup);
                    } else {
                        if (time_of_last_full_backup == 0
                            || time_of_last_full_backup <
                            statbuf.st_ctime) {
                            fprintf(fout, "%s\n", new);
                            if ((counter++) > 128) {
                                counter = 0;
                                uberctr++;
                                sprintf(tmp, " %c ",
                                        special_dot_char(uberctr));
#ifndef _XWIN
                                if (!g_text_mode) {
                                    newtDrawRootText(77, g_noof_rows - 3,
                                                     tmp);
                                    newtRefresh();
                                }
#endif
                            }
                        }
                    }
                }
            }
        }
    }
    if (dip) {
        if (closedir(dip) == -1) {
            log_OS_error("closedir");
        }
    }
    depth--;
    if (!depth) {
        close_evalcall_form();
        mr_free(name_of_evalcall_form);
        mr_free(find_skeleton_marker);
        unlink(g_skeleton_filelist);
        log_msg(5, "g_skeleton_entries = %ld", g_skeleton_entries);
    }
    mr_free(tmp);
    mr_free(sth_B);
    mr_free(ith_B);
    mr_free(new_with_spaces);
    return (0);
}



/**
 * Get the next entry in the space-separated list in @p incoming.
 * So if @p incoming was '"one and two" three four', we would
 * return "one and two".
 * @param incoming The list to get the next entry from.
 * @return The first item in the list (respecting double quotes).
 * @note The returned string points to static data that will be overwritten with each call.
 */
char *next_entry(char *incoming)
{
    static char sz_res[MAX_STR_LEN];
    char *p;
    bool in_quotes = FALSE;

    strcpy(sz_res, incoming);
    p = sz_res;
    while ((*p != ' ' || in_quotes) && *p != '\0') {
        if (*p == '\"') {
            in_quotes = !in_quotes;
        }
        p++;
    }
    *p = '\0';
    return (sz_res);
}



/**
 * Create the filelist for the backup. It will be stored in [scratchdir]/archives/filelist.full.
 * @param logfile Unused.
 * @param tmpdir The tmpdir of the backup.
 * @param scratchdir The scratchdir of the backup.
 * @param include_paths The paths to back up, or NULL if you're using a user-defined filelist.
 * @param excp The paths to NOT back up.
 * @param differential The differential level (currently only 0 and 1 are supported).
 * @param userdef_filelist The user-defined filelist, or NULL if you're using @p include_paths.
 * @return 0, always.
 * @bug @p logfile is unused.
 * @bug Return value is meaningless.
 */
int mondo_makefilelist(char *logfile, char *tmpdir, char *scratchdir,
                       char *include_paths, char *excp, int differential,
                       char *userdef_filelist)
{
    char sz_datefile_wildcard[] = "/var/cache/mondo-archive/difflevel.%d";
    char *p, *q;
    char sz_datefile[80];
    char *sz_filelist, *exclude_paths, *tmp;
    int i;
    FILE *fout;
    char *command;
    time_t time_of_last_full_backup = 0;
    struct stat statbuf;

    malloc_string(command);
    malloc_string(tmp);
    malloc_string(sz_filelist);
    malloc_string(g_skeleton_filelist);
    exclude_paths = mr_malloc(1000);
    log_msg(3, "Trying to write test string to exclude_paths");
    strcpy(exclude_paths, "/blah /froo");
    log_msg(3, "...Success!");
    sprintf(sz_datefile, sz_datefile_wildcard, 0);
    if (!include_paths && !userdef_filelist) {
        fatal_error
            ("Please supply either include_paths or userdef_filelist");
    }
// make hole for filelist
    sprintf(command, "mkdir -p %s/archives", scratchdir);
    paranoid_system(command);
    sprintf(sz_filelist, "%s/tmpfs/filelist.full", tmpdir);
    make_hole_for_file(sz_filelist);

    if (differential == 0) {
        // restore last good datefile if it exists
        sprintf(command, "cp -f %s.aborted %s", sz_datefile, sz_datefile);
        run_program_and_log_output(command, 3);
        // backup last known good datefile just in case :)
        if (does_file_exist(sz_datefile)) {
            sprintf(command, "mv -f %s %s.aborted", sz_datefile,
                    sz_datefile);
            paranoid_system(command);
        }
        make_hole_for_file(sz_datefile);
        write_one_liner_data_file(sz_datefile,
                                  call_program_and_get_last_line_of_output
                                  ("date +%s"));
    } else if (lstat(sz_datefile, &statbuf)) {
        log_msg(2,
                "Warning - unable to find date of previous backup. Full backup instead.");
        differential = 0;
        time_of_last_full_backup = 0;
    } else {
        time_of_last_full_backup = statbuf.st_mtime;
        log_msg(2, "Differential backup. Yay.");
    }

// use user-specified filelist (if specified)
    if (userdef_filelist) {
        log_msg(1,
                "Using the user-specified filelist - %s - instead of calculating one",
                userdef_filelist);
        sprintf(command, "cp -f %s %s", userdef_filelist, sz_filelist);
        if (run_program_and_log_output(command, 3)) {
            fatal_error("Failed to copy user-specified filelist");
        }
    } else {
        log_msg(2, "include_paths = '%s'", include_paths);
        log_msg(1, "Calculating filelist");
        sprintf(exclude_paths, " %s %s %s %s %s %s . .. \
" MNT_CDROM " " MNT_FLOPPY " /media \
/proc /sys /tmp /root/images/mondo /var/cache/mindi ", excp, call_program_and_get_last_line_of_output("locate /win386.swp 2> /dev/null"), call_program_and_get_last_line_of_output("locate /hiberfil.sys 2> /dev/null"), call_program_and_get_last_line_of_output("locate /pagefile.sys 2> /dev/null"), (tmpdir[0] == '/' && tmpdir[1] == '/') ? (tmpdir + 1) : tmpdir, (scratchdir[0] == '/' && scratchdir[1] == '/') ? (scratchdir + 1) : scratchdir);

        log_msg(2, "Excluding paths = '%s'", exclude_paths);
        log_msg(2,
                "Generating skeleton filelist so that we can track our progress");
        sprintf(g_skeleton_filelist, "%s/tmpfs/skeleton.txt", tmpdir);
        make_hole_for_file(g_skeleton_filelist);
        log_msg(4, "g_skeleton_entries = %ld", g_skeleton_entries);
        log_msg(2, "Opening out filelist to %s", sz_filelist);
        if (!(fout = fopen(sz_filelist, "w"))) {
            fatal_error("Cannot openout to sz_filelist");
        }
        i = 0;
        if (strlen(include_paths) == 0) {
            log_msg(1, "Including only '/' in %s", sz_filelist);
            open_and_list_dir("/", exclude_paths, fout,
                              time_of_last_full_backup);
        } else {
            p = include_paths;
            while (*p) {
                q = next_entry(p);
                log_msg(1, "Including %s in filelist %s", q, sz_filelist);
                open_and_list_dir(q, exclude_paths, fout,
                                  time_of_last_full_backup);
                p += strlen(q);
                while (*p == ' ') {
                    p++;
                }
            }
        }
        paranoid_fclose(fout);
    }
    log_msg(2, "Copying new filelist to scratchdir");
    sprintf(command, "mkdir -p %s/archives", scratchdir);
    paranoid_system(command);
    sprintf(command, "cp -f %s %s/archives/", sz_filelist, scratchdir);
    paranoid_system(command);
    sprintf(command, "mv -f %s %s", sz_filelist, tmpdir);
    paranoid_system(command);
    log_msg(2, "Freeing variables");
    mr_free(sz_filelist);
    mr_free(command);
    mr_free(exclude_paths);
    mr_free(tmp);
    mr_free(g_skeleton_filelist);
    log_msg(2, "Exiting");
    return (0);
}




/**
 * Locate the string @p string_to_find in the tree rooted at @p startnode.
 * @param startnode The node containing the root of the directory tree.
 * @param string_to_find The string to look for at @p startnode.
 * @return The node containing the last element of @p string_to_find, or NULL if
 * it was not found.
 */
struct s_node *find_string_at_node(struct s_node *startnode,
                                   char *string_to_find)
{
    /*@ int ******************************************************** */
    int noof_chars;
    static int depth = 0;
    static char original_string[MAX_STR_LEN];

    /*@ sturctures ************************************************* */
    struct s_node *node;

    /*@ char  ****************************************************** */
    char char_to_find;

    /*@ bools ****************************************************** */

    if (!depth) {
        strcpy(original_string, string_to_find);
    }

    assert(startnode != NULL);
    assert(string_to_find != NULL);

    noof_chars = strlen(string_to_find) + 1;    /* we include the '\0' */

    log_msg(7, "starting --- str=%s", string_to_find);

/* walk across tree if necessary */
    node = startnode;
    char_to_find = string_to_find[0];
    if (node->right != NULL && node->ch < char_to_find) {
        log_msg(7, "depth=%d --- going RIGHT ... %c-->%c", depth,
                char_to_find, node->ch, (node->right)->ch);
        return (find_string_at_node(node->right, string_to_find));
    }

/* walk down tree if appropriate */
    if (node->down != NULL && node->ch == char_to_find) {
        log_msg(7, "depth=%d char=%c --- going DOWN", depth, char_to_find);
        depth++;
        node = find_string_at_node(node->down, string_to_find + 1);
        depth--;
        return (node);
    }

    if (char_to_find == '\0' && node->ch == '\0') {
        log_msg(7, "%s is in tree", original_string);
        return (node);
    } else {
        log_msg(7, "%s is NOT in tree", original_string);
        return (NULL);
    }
}



/**
 * Write all entries in @p needles_list_fname which are also in
 * @p filelist to @p matches_list_fname.
 * @param needles_list_fname A file containing strings to look for, 1 per line.
 * @param filelist The node for the root of the directory structure to search in.
 * @param matches_list_fname The filename where we should put the matches.
 * @return The number of matches found.
 */
long save_filelist_entries_in_common(char *needles_list_fname,
                                     struct s_node *filelist,
                                     char *matches_list_fname,
                                     bool use_star)
{
    int retval = 0;
    struct s_node *found_node;
    FILE *fin;
    FILE *fout;
    char *fname;
    char *tmp;
    size_t len = 0;             // Scrub's patch doesn't work without that

//  log_msg(1, "use_star = %s", (use_star)?"TRUE":"FALSE");
    malloc_string(fname);
    malloc_string(tmp);
    log_msg(5, "starting");
    log_msg(5, "needles_list_fname = %s", needles_list_fname);
    log_msg(5, "matches_list_fname = %s", matches_list_fname);
    if (!(fin = fopen(needles_list_fname, "r"))) {
        fatal_error("Cannot openin needles_list_fname");
    }
    if (!(fout = fopen(matches_list_fname, "w"))) {
        fatal_error("Cannot openout matches_list_fname");
    }
    while (!feof(fin)) {
//      fscanf(fin, "%s\n", fname);
        len = MAX_STR_LEN - 1;
        getline(&fname, &len, fin); // patch by Scrub
        if (!use_star) {
            if (fname[0] == '/') {
                strcpy(tmp, fname);
            } else {
                tmp[0] = '/';
                strcpy(tmp + 1, fname);
            }
            strcpy(fname, tmp);
        }
        while (strlen(fname) > 0 && fname[strlen(fname) - 1] < 32) {
            fname[strlen(fname) - 1] = '\0';
        }

/*
      if (strlen(fname)>3 && fname[strlen(fname)-1]=='/') { fname[strlen(fname)-1] = '\0'; }
      if (strlen(fname)==0) { continue; }
      sprintf(temporary_string, "echo \"Looking for '%s'\" >> /tmp/looking.txt", fname);
      system(temporary_string);
*/

        log_msg(5, "Looking for '%s'", fname);
        found_node = find_string_at_node(filelist, fname);
        if (found_node) {
            if (found_node->selected) {
//              if (use_star)
                if (fname[0] == '/') {
                    strcpy(tmp, fname + 1);
                    strcpy(fname, tmp);
                }
                log_msg(5, "Found '%s'", fname);
                turn_wildcard_chars_into_literal_chars(tmp, fname);
                fprintf(fout, "%s\n", tmp);
                retval++;
            }
        }
    }
    paranoid_fclose(fout);
    paranoid_fclose(fin);
    mr_free(fname);
    mr_free(tmp);
    return (retval);
}






/**
 * Add all files listed in @p list_of_files_fname to the directory structure rooted at
 * @p filelist.
 * @param filelist The top node of the directory structure to add the files to.
 * @param list_of_files_fname The file containing the files to add, 1 per line.
 * @param flag_em If TRUE, then flag the added files for restoration.
 * @return 0 for success, nonzero for failure.
 */
int add_list_of_files_to_filelist(struct s_node *filelist,
                                  char *list_of_files_fname, bool flag_em)
{
    FILE *fin;
    char *tmp;
    struct s_node *nod;

    malloc_string(tmp);
    log_msg(3, "Adding %s to filelist", list_of_files_fname);
    if (!(fin = fopen(list_of_files_fname, "r"))) {
        iamhere(list_of_files_fname);
        return (1);
    }
    for (fgets(tmp, MAX_STR_LEN, fin); !feof(fin);
         fgets(tmp, MAX_STR_LEN, fin)) {
        if (!tmp[0]) {
            continue;
        }
        if ((tmp[strlen(tmp) - 1] == 13 || tmp[strlen(tmp) - 1] == 10)
            && strlen(tmp) > 0) {
            tmp[strlen(tmp) - 1] = '\0';
        }
        log_msg(2, "tmp = '%s'", tmp);
        if (!tmp[0]) {
            continue;
        }
        if ((nod = find_string_at_node(filelist, tmp))) {
            log_msg(5, "Found '%s' in filelist already. Cool.", tmp);
        } else {
            add_string_at_node(filelist, tmp);
            nod = find_string_at_node(filelist, tmp);
        }

        if (nod && flag_em) {
            toggle_path_selection(filelist, tmp, TRUE);
            log_msg(5, "Flagged '%s'", tmp);
        }
    }
    paranoid_fclose(fin);
    mr_free(tmp);
    return (0);
}

/* @} - end of filelistGroup */