s_file.c 24 KB
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/* Copyright (c) 1997-2004 Miller Puckette.
* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution.  */

/*
 * this file implements a mechanism for storing and retrieving preferences.
 * Should later be renamed "preferences.c" or something.
 *
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 * In unix this is handled by the "~/.pd-l2ork/user.settings" file, in windows by
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 * the registry, and in MacOS by the Preferences system.
 */

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#include "config.h"

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#include "m_pd.h"
#include "s_stuff.h"
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
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#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#ifdef HAVE_UNISTD_H
/* XXX Hack!  This should be done with a cleaner check. */
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#include <sys/types.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#endif
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#ifdef MSW
#include <windows.h>
#include <tchar.h>
#endif
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#ifdef _MSC_VER  /* This is only for Microsoft's compiler, not cygwin, e.g. */
#define snprintf sprintf_s
#endif
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int sys_defeatrt;
t_symbol *sys_flags = &s_;
void sys_doflags( void);

#ifdef UNIX

static char *sys_prefbuf;
static int sys_prefbufsize;

static void sys_initloadpreferences( void)
{
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    char filenamebuf[FILENAME_MAX], *homedir = getenv("HOME");
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    int fd, length;
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    char user_prefs_file[FILENAME_MAX]; /* user prefs file */
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        /* default prefs embedded in the package */
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    char default_prefs_file[FILENAME_MAX];
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    struct stat statbuf;

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    snprintf(default_prefs_file, FILENAME_MAX, "%s/default.settings", 
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             sys_libdir->s_name);
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    if (homedir)
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        snprintf(user_prefs_file, FILENAME_MAX, "%s/.pd-l2ork/user.settings", homedir);
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    if (stat(user_prefs_file, &statbuf) == 0) 
        strncpy(filenamebuf, user_prefs_file, FILENAME_MAX);
    else if (stat(default_prefs_file, &statbuf) == 0)
        strncpy(filenamebuf, default_prefs_file, FILENAME_MAX);
    else
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        return;
    filenamebuf[FILENAME_MAX-1] = 0;
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    if ((fd = open(filenamebuf, 0)) < 0)
    {
        if (sys_verbose)
            perror(filenamebuf);
        return;
    }
    length = lseek(fd, 0, 2);
    if (length < 0)
    {
        if (sys_verbose)
            perror(filenamebuf);
        close(fd);
        return;
    }
    lseek(fd, 0, 0);
    if (!(sys_prefbuf = malloc(length + 2)))
    {
        error("couldn't allocate memory for preferences buffer");
        close(fd);
        return;
    }
    sys_prefbuf[0] = '\n';
    if (read(fd, sys_prefbuf+1, length) < length)
    {
        perror(filenamebuf);
        sys_prefbuf[0] = 0;
        close(fd);
        return;
    }
    sys_prefbuf[length+1] = 0;
    close(fd);
    if (sys_verbose)
        post("success reading preferences from: %s", filenamebuf);
}

static int sys_getpreference(const char *key, char *value, int size)
{
    char searchfor[80], *where, *whereend;
    if (!sys_prefbuf)
        return (0);
    sprintf(searchfor, "\n%s:", key);
    where = strstr(sys_prefbuf, searchfor);
    if (!where)
        return (0);
    where += strlen(searchfor);
    while (*where == ' ' || *where == '\t')
        where++;
    for (whereend = where; *whereend && *whereend != '\n'; whereend++)
        ;
    if (*whereend == '\n')
        whereend--;
    if (whereend > where + size - 1)
        whereend = where + size - 1;
    strncpy(value, where, whereend+1-where);
    value[whereend+1-where] = 0;
    return (1);
}

static void sys_doneloadpreferences( void)
{
    if (sys_prefbuf)
        free(sys_prefbuf);
}

static FILE *sys_prefsavefp;

static void sys_initsavepreferences( void)
{
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    char filenamebuf[FILENAME_MAX], *homedir = getenv("HOME");
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    struct stat statbuf;
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    if (!homedir)
        return;
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    snprintf(filenamebuf, FILENAME_MAX, "%s/.pd-l2ork", homedir);
    filenamebuf[FILENAME_MAX-1] = 0;
    if (stat(filenamebuf, &statbuf) || !S_ISDIR(statbuf.st_mode)) {
      // user config dir doesn't exist yet, try to create it
      if (mkdir(filenamebuf, 0755)) {
        pd_error(0, "%s: %s",filenamebuf, strerror(errno));
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        return;
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      }
    }
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    snprintf(filenamebuf, FILENAME_MAX, "%s/.pd-l2ork/user.settings", homedir);
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    filenamebuf[FILENAME_MAX-1] = 0;
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    if ((sys_prefsavefp = fopen(filenamebuf, "w")) == NULL)
    {
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        //snprintf(errbuf, FILENAME_MAX, "%s: %s",filenamebuf, strerror(errno));
        pd_error(0, "%s: %s",filenamebuf, strerror(errno));
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    }
}

static void sys_putpreference(const char *key, const char *value)
{
    if (sys_prefsavefp)
        fprintf(sys_prefsavefp, "%s: %s\n",
            key, value);
}

static void sys_donesavepreferences( void)
{
    if (sys_prefsavefp)
    {
        fclose(sys_prefsavefp);
        sys_prefsavefp = 0;
    }
}

#endif /* UNIX */

#ifdef MSW

static void sys_initloadpreferences( void)
{
}

static int sys_getpreference(const char *key, char *value, int size)
{
    HKEY hkey;
    DWORD bigsize = size;
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    LONG err = RegOpenKeyEx(HKEY_CURRENT_USER,
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        "Software\\Purr-Data", 0,  KEY_QUERY_VALUE, &hkey);
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    if (err != ERROR_SUCCESS)
    {
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        err = RegOpenKeyEx(HKEY_LOCAL_MACHINE,
            "Software\\Purr-Data", 0,  KEY_QUERY_VALUE, &hkey);
        if (err != ERROR_SUCCESS)
        {
            return (0);
	}
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    }
    err = RegQueryValueEx(hkey, key, 0, 0, value, &bigsize);
    if (err != ERROR_SUCCESS)
    {
        RegCloseKey(hkey);
        return (0);
    }
    RegCloseKey(hkey);
    return (1);
}

static void sys_doneloadpreferences( void)
{
}

static void sys_initsavepreferences( void)
{
}

static void sys_putpreference(const char *key, const char *value)
{
    HKEY hkey;
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    LONG err = RegCreateKeyEx(HKEY_CURRENT_USER,
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        "Software\\Purr-Data", 0, NULL, REG_OPTION_NON_VOLATILE, KEY_SET_VALUE,
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        NULL, &hkey, NULL);
    if (err != ERROR_SUCCESS)
    {
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        post("unable to create registry entry: %s: error %lx\n", key,
            (long unsigned int)err);
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        return;
    }
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    err = RegSetValueEx(hkey, key, 0, REG_EXPAND_SZ, value, strlen(value)+1);
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    if (err != ERROR_SUCCESS)
        post("unable to set registry entry: %s\n", key);
    RegCloseKey(hkey);
}

static void sys_donesavepreferences( void)
{
}

#endif /* MSW */

#ifdef __APPLE__

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// prefs file that is currently the one to save to
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static char current_prefs[FILENAME_MAX] = "org.puredata.pd-l2ork"; 
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static void sys_initloadpreferences( void)
{
}

static int sys_getpreference(const char *key, char *value, int size)
{
    char cmdbuf[256];
    int nread = 0, nleft = size;
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    char default_prefs[FILENAME_MAX]; // default prefs embedded in the package
    char embedded_prefs[FILENAME_MAX]; // overrides others for standalone app
    char embedded_prefs_file[FILENAME_MAX];
    char user_prefs_file[FILENAME_MAX];
    char *homedir = getenv("HOME");
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    struct stat statbuf;
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    /* the 'defaults' command expects the filename without .plist at the end */
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    snprintf(default_prefs, FILENAME_MAX, "%s/../org.puredata.pd-l2ork.default", 
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             sys_libdir->s_name);
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    snprintf(embedded_prefs, FILENAME_MAX, "%s/../org.puredata.pd-l2ork", 
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             sys_libdir->s_name);
    snprintf(embedded_prefs_file, FILENAME_MAX, "%s.plist", embedded_prefs);
    snprintf(user_prefs_file, FILENAME_MAX, 
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             "%s/Library/Preferences/org.puredata.pd-l2ork.plist", homedir);
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    if (stat(embedded_prefs_file, &statbuf) == 0) 
    {
        snprintf(cmdbuf, FILENAME_MAX + 20, 
                 "defaults read '%s' %s 2> /dev/null\n", embedded_prefs, key);
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        strncpy(current_prefs, embedded_prefs, FILENAME_MAX);
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    }
    else if (stat(user_prefs_file, &statbuf) == 0) 
    {
        snprintf(cmdbuf, FILENAME_MAX + 20, 
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                 "defaults read org.puredata.pd-l2ork %s 2> /dev/null\n", key);
        strcpy(current_prefs, "org.puredata.pd-l2ork");
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    }
    else 
    {
        snprintf(cmdbuf, FILENAME_MAX + 20, 
                 "defaults read '%s' %s 2> /dev/null\n", default_prefs, key);
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        strcpy(current_prefs, "org.puredata.pd-l2ork");
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    }
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    FILE *fp = popen(cmdbuf, "r");
    while (nread < size)
    {
        int newread = fread(value+nread, 1, size-nread, fp);
        if (newread <= 0)
            break;
        nread += newread;
    }
    pclose(fp);
    if (nread < 1)
        return (0);
    if (nread >= size)
        nread = size-1;
    value[nread] = 0;
    if (value[nread-1] == '\n')     /* remove newline character at end */
        value[nread-1] = 0;
    return(1);
}

static void sys_doneloadpreferences( void)
{
}

static void sys_initsavepreferences( void)
{
}

static void sys_putpreference(const char *key, const char *value)
{
    char cmdbuf[MAXPDSTRING];
    snprintf(cmdbuf, MAXPDSTRING, 
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             "defaults write '%s' %s \"%s\" 2> /dev/null\n",
             current_prefs, key, value);
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    system(cmdbuf);
}

static void sys_donesavepreferences( void)
{
}

#endif /* __APPLE__ */


void sys_loadpreferences( void)
{
    int naudioindev, audioindev[MAXAUDIOINDEV], chindev[MAXAUDIOINDEV];
    int naudiooutdev, audiooutdev[MAXAUDIOOUTDEV], choutdev[MAXAUDIOOUTDEV];
    int nmidiindev, midiindev[MAXMIDIINDEV];
    int nmidioutdev, midioutdev[MAXMIDIOUTDEV];
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    int i, rate = 0, advance = -1, callback = 0, blocksize = 0,
        api, nolib, maxi;
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    char prefbuf[MAXPDSTRING], keybuf[80];

    sys_initloadpreferences();
        /* load audio preferences */
    if (sys_getpreference("audioapi", prefbuf, MAXPDSTRING)
        && sscanf(prefbuf, "%d", &api) > 0)
            sys_set_audio_api(api);
            /* JMZ/MB: brackets for initializing */
    if (sys_getpreference("noaudioin", prefbuf, MAXPDSTRING) &&
        (!strcmp(prefbuf, ".") || !strcmp(prefbuf, "True")))
            naudioindev = 0;
    else
    {
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        /* AG: naudioin key */
        /* The idea here is to keep track of the actual number of devices, so
           that we don't read stale device entries which were removed long ago
           but are still present in the defaults/registry on Mac and Windows.
           (This bug is in all other Pd versions out there. It only affects
           Mac and Windows, since the config information on Linux is kept in a
           file which is overwritten each time the config information is
           saved, so there are never any stale device entries in it.)
           Our code is fully compatible with config info from other Pd
           versions, i.e., we fall back to the default behavior of looking for
           up to MAXAUDIOINDEV devices if the naudioin key isn't set, and the
           naudioin key will just be ignored if our config happens to be read
           by other Pd versions. Audio outputs and MIDI inputs/outputs are
           handled in exactly the same fashion below. */
        int n;
        if (!(sys_getpreference("naudioin", prefbuf, MAXPDSTRING)
              && sscanf(prefbuf, "%d", &n) > 0))
            n = MAXAUDIOINDEV;
        for (i = 0, naudioindev = 0; i < n; i++)
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        {
            sprintf(keybuf, "audioindev%d", i+1);
            if (!sys_getpreference(keybuf, prefbuf, MAXPDSTRING))
                break;
            if (sscanf(prefbuf, "%d %d", &audioindev[i], &chindev[i]) < 2)
                break;
            naudioindev++;
        }
            /* if no preferences at all, set -1 for default behavior */
        if (naudioindev == 0)
            naudioindev = -1;
    }
        /* JMZ/MB: brackets for initializing */
    if (sys_getpreference("noaudioout", prefbuf, MAXPDSTRING) &&
        (!strcmp(prefbuf, ".") || !strcmp(prefbuf, "True")))
            naudiooutdev = 0;
    else
    {
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        /* AG: naudioout key */
        int n;
        if (!(sys_getpreference("naudioout", prefbuf, MAXPDSTRING)
              && sscanf(prefbuf, "%d", &n) > 0))
            n = MAXAUDIOOUTDEV;
        for (i = 0, naudiooutdev = 0; i < n; i++)
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        {
            sprintf(keybuf, "audiooutdev%d", i+1);
            if (!sys_getpreference(keybuf, prefbuf, MAXPDSTRING))
                break;
            if (sscanf(prefbuf, "%d %d", &audiooutdev[i], &choutdev[i]) < 2)
                break;
            naudiooutdev++;
        }
        if (naudiooutdev == 0)
            naudiooutdev = -1;
    }
    if (sys_getpreference("rate", prefbuf, MAXPDSTRING))
        sscanf(prefbuf, "%d", &rate);
    if (sys_getpreference("audiobuf", prefbuf, MAXPDSTRING))
        sscanf(prefbuf, "%d", &advance);
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    if (sys_getpreference("callback", prefbuf, MAXPDSTRING))
        sscanf(prefbuf, "%d", &callback);
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    if (sys_getpreference("blocksize", prefbuf, MAXPDSTRING))
        sscanf(prefbuf, "%d", &blocksize);
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    sys_set_audio_settings(naudioindev, audioindev, naudioindev, chindev,
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        naudiooutdev, audiooutdev, naudiooutdev, choutdev, rate, advance,
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        callback, blocksize);
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        /* load MIDI preferences */
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    if (sys_getpreference("midiapi", prefbuf, MAXPDSTRING)
        && sscanf(prefbuf, "%d", &api) > 0)
            sys_set_midi_api(api);
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        /* JMZ/MB: brackets for initializing */
    if (sys_getpreference("nomidiin", prefbuf, MAXPDSTRING) &&
        (!strcmp(prefbuf, ".") || !strcmp(prefbuf, "True")))
            nmidiindev = 0;
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    else
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    {
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        /* AG: nmidiin key */
        int n;
        if (!(sys_getpreference("nmidiin", prefbuf, MAXPDSTRING)
              && sscanf(prefbuf, "%d", &n) > 0))
            n = MAXMIDIINDEV;
        for (i = 0, nmidiindev = 0; i < n; i++)
        {
            sprintf(keybuf, "midiindev%d", i+1);
            if (!sys_getpreference(keybuf, prefbuf, MAXPDSTRING))
                break;
            if (sscanf(prefbuf, "%d", &midiindev[i]) < 1)
                break;
            nmidiindev++;
        }
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    }
        /* JMZ/MB: brackets for initializing */
    if (sys_getpreference("nomidiout", prefbuf, MAXPDSTRING) &&
        (!strcmp(prefbuf, ".") || !strcmp(prefbuf, "True")))
            nmidioutdev = 0;
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    else
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    {
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        /* AG: nmidiout key */
        int n;
        if (!(sys_getpreference("nmidiout", prefbuf, MAXPDSTRING)
              && sscanf(prefbuf, "%d", &n) > 0))
            n = MAXMIDIOUTDEV;
        for (i = 0, nmidioutdev = 0; i < n; i++)
        {
            sprintf(keybuf, "midioutdev%d", i+1);
            if (!sys_getpreference(keybuf, prefbuf, MAXPDSTRING))
                break;
            if (sscanf(prefbuf, "%d", &midioutdev[i]) < 1)
                break;
            nmidioutdev++;
        }
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    }
    sys_open_midi(nmidiindev, midiindev, nmidioutdev, midioutdev, 0);

        /* search path */
    if (sys_getpreference("npath", prefbuf, MAXPDSTRING))
        sscanf(prefbuf, "%d", &maxi);
    else maxi = 0x7fffffff;
    for (i = 0; i<maxi; i++)
    {
        sprintf(keybuf, "path%d", i+1);
        if (!sys_getpreference(keybuf, prefbuf, MAXPDSTRING))
            break;
        sys_searchpath = namelist_append_files(sys_searchpath, prefbuf);
    }
    if (sys_getpreference("standardpath", prefbuf, MAXPDSTRING))
        sscanf(prefbuf, "%d", &sys_usestdpath);
    if (sys_getpreference("verbose", prefbuf, MAXPDSTRING))
        sscanf(prefbuf, "%d", &sys_verbose);

        /* startup settings */
    if (sys_getpreference("nloadlib", prefbuf, MAXPDSTRING))
        sscanf(prefbuf, "%d", &maxi);
    else maxi = 0x7fffffff;
    for (i = 0; i<maxi; i++)
    {
        sprintf(keybuf, "loadlib%d", i+1);
        if (!sys_getpreference(keybuf, prefbuf, MAXPDSTRING))
            break;
        sys_externlist = namelist_append_files(sys_externlist, prefbuf);
    }
    if (sys_getpreference("defeatrt", prefbuf, MAXPDSTRING))
        sscanf(prefbuf, "%d", &sys_defeatrt);
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    if (sys_getpreference("guipreset", prefbuf, MAXPDSTRING))
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    {
        char preset_buf[MAXPDSTRING];
        sscanf(prefbuf, "%s", preset_buf);
        sys_gui_preset = gensym(preset_buf);
    }
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    if (sys_getpreference("flags", prefbuf, MAXPDSTRING))
    {
        if (strcmp(prefbuf, "."))
            sys_flags = gensym(prefbuf);
    }
    sys_doflags();

    if (sys_defeatrt)
        sys_hipriority = 0;
    else
#ifdef UNIX
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        sys_hipriority = 1; //!geteuid();
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#else
#ifdef MSW
        sys_hipriority = 0;
#else
        sys_hipriority = 1;
#endif
#endif
}

void glob_savepreferences(t_pd *dummy)
{
    int naudioindev, audioindev[MAXAUDIOINDEV], chindev[MAXAUDIOINDEV];
    int naudiooutdev, audiooutdev[MAXAUDIOOUTDEV], choutdev[MAXAUDIOOUTDEV];
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    int i, rate, advance, callback, blocksize;
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    char buf1[MAXPDSTRING], buf2[MAXPDSTRING];
    int nmidiindev, midiindev[MAXMIDIINDEV];
    int nmidioutdev, midioutdev[MAXMIDIOUTDEV];

    sys_initsavepreferences();


        /* audio settings */
    sprintf(buf1, "%d", sys_audioapi);
    sys_putpreference("audioapi", buf1);

    sys_get_audio_params(&naudioindev, audioindev, chindev,
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        &naudiooutdev, audiooutdev, choutdev, &rate, &advance, &callback,
            &blocksize);
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    sys_putpreference("noaudioin", (naudioindev <= 0 ? "True" : "False"));
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    /* AG: additional naudioin key, see the comments in sys_loadpreferences
       above for explanation */
    sprintf(buf1, "%d", naudioindev);
    sys_putpreference("naudioin", buf1);
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    for (i = 0; i < naudioindev; i++)
    {
        sprintf(buf1, "audioindev%d", i+1);
        sprintf(buf2, "%d %d", audioindev[i], chindev[i]);
        sys_putpreference(buf1, buf2);
    }
    sys_putpreference("noaudioout", (naudiooutdev <= 0 ? "True" : "False"));
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    /* AG: naudioout key */
    sprintf(buf1, "%d", naudiooutdev);
    sys_putpreference("naudioout", buf1);
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    for (i = 0; i < naudiooutdev; i++)
    {
        sprintf(buf1, "audiooutdev%d", i+1);
        sprintf(buf2, "%d %d", audiooutdev[i], choutdev[i]);
        sys_putpreference(buf1, buf2);
   }

    sprintf(buf1, "%d", advance);
    sys_putpreference("audiobuf", buf1);

    sprintf(buf1, "%d", rate);
    sys_putpreference("rate", buf1);

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    sprintf(buf1, "%d", callback);
    sys_putpreference("callback", buf1);

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    sprintf(buf1, "%d", blocksize);
    sys_putpreference("blocksize", buf1);

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        /* MIDI settings */
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    sprintf(buf1, "%d", sys_midiapi);
    sys_putpreference("midiapi", buf1);

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    sys_get_midi_params(&nmidiindev, midiindev, &nmidioutdev, midioutdev);
    sys_putpreference("nomidiin", (nmidiindev <= 0 ? "True" : "False"));
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    /* AG: nmidiin */
    sprintf(buf1, "%d", nmidiindev);
    sys_putpreference("nmidiin", buf1);
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    for (i = 0; i < nmidiindev; i++)
    {
        sprintf(buf1, "midiindev%d", i+1);
        sprintf(buf2, "%d", midiindev[i]);
        sys_putpreference(buf1, buf2);
    }
    sys_putpreference("nomidiout", (nmidioutdev <= 0 ? "True" : "False"));
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    /* AG: nmidiout */
    sprintf(buf1, "%d", nmidioutdev);
    sys_putpreference("nmidiout", buf1);
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    for (i = 0; i < nmidioutdev; i++)
    {
        sprintf(buf1, "midioutdev%d", i+1);
        sprintf(buf2, "%d", midioutdev[i]);
        sys_putpreference(buf1, buf2);
    }
        /* file search path */

    for (i = 0; 1; i++)
    {
        char *pathelem = namelist_get(sys_searchpath, i);
        if (!pathelem)
            break;
        sprintf(buf1, "path%d", i+1);
        sys_putpreference(buf1, pathelem);
    }
    sprintf(buf1, "%d", i);
    sys_putpreference("npath", buf1);
    sprintf(buf1, "%d", sys_usestdpath);
    sys_putpreference("standardpath", buf1);
    sprintf(buf1, "%d", sys_verbose);
    sys_putpreference("verbose", buf1);
    
        /* startup */
    for (i = 0; 1; i++)
    {
        char *pathelem = namelist_get(sys_externlist, i);
        if (!pathelem)
            break;
        sprintf(buf1, "loadlib%d", i+1);
        sys_putpreference(buf1, pathelem);
    }
    sprintf(buf1, "%d", i);
    sys_putpreference("nloadlib", buf1);
    sprintf(buf1, "%d", sys_defeatrt);
    sys_putpreference("defeatrt", buf1);
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    sys_putpreference("guipreset", sys_gui_preset->s_name);
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    sys_putpreference("flags", 
        (sys_flags ? sys_flags->s_name : ""));
    sys_donesavepreferences();
    
}
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/* AG: Recent files table */

int sys_n_recent_files = 0;
char *sys_recent_files[MAX_RECENT_FILES];

static int fexists(const char *s)
{
  struct stat statbuf;
  return stat(s, &statbuf) == 0;
}

void sys_add_recent_file(const char *s)
{
  int i;
  // only add the file if it actually exists
  if (!fexists(s)) return;
  for (i = 0; i < sys_n_recent_files && strcmp(sys_recent_files[i], s); i++) ;
  if (i < sys_n_recent_files) {
    // already got an existing entry, move it to the front
    char *t = sys_recent_files[i];
    memmove(sys_recent_files+1, sys_recent_files, i*sizeof(char*));
    sys_recent_files[0] = t;
  } else {
    char *t = strdup(s);
    if (!t) return;
    if (sys_n_recent_files == MAX_RECENT_FILES) {
      // kick out the oldest entry to make room for a new one
      free(sys_recent_files[--sys_n_recent_files]);
    }
    // add a new entry at the beginning of the table
    memmove(sys_recent_files+1, sys_recent_files,
            sys_n_recent_files*sizeof(char*));
    sys_recent_files[0] = t;
    sys_n_recent_files++;
  }
}

void sys_save_recent_files(void)
{
  int i;
#ifdef UNIX
  // UNIX/Linux: save in recent_files file
  FILE *fp;
  char filenamebuf[FILENAME_MAX], *homedir = getenv("HOME");
  struct stat statbuf;
  if (!homedir) return;
  snprintf(filenamebuf, FILENAME_MAX, "%s/.pd-l2ork", homedir);
  filenamebuf[FILENAME_MAX-1] = 0;
  if (stat(filenamebuf, &statbuf) || !S_ISDIR(statbuf.st_mode)) {
    // user config dir doesn't exist yet, try to create it
    if (mkdir(filenamebuf, 0755)) {
      pd_error(0, "%s: %s",filenamebuf, strerror(errno));
      return;
    }
  }
  snprintf(filenamebuf, FILENAME_MAX, "%s/.pd-l2ork/recent_files", homedir);
  filenamebuf[FILENAME_MAX-1] = 0;
  if ((fp = fopen(filenamebuf, "w")) == NULL) {
    pd_error(0, "%s: %s",filenamebuf, strerror(errno));
    return;
  }
  for (i = 0; i < sys_n_recent_files; i++) {
    fprintf(fp, "%s\n", sys_recent_files[i]);
  }
  fclose(fp);
#else
  // Mac/Windows (use the defaults/registry)
  char buf[MAXPDSTRING];
  sys_initsavepreferences();
  for (i = 0; i < sys_n_recent_files; i++) {
    sprintf(buf, "recent%d", i+1);
    sys_putpreference(buf, sys_recent_files[i]);
  }
  sprintf(buf, "%d", i);
  sys_putpreference("nrecent", buf);
  sys_donesavepreferences();
#endif
}

void sys_load_recent_files(void)
{
#ifdef UNIX
  // UNIX/Linux: load from recent_files file
  FILE *fp;
  char filenamebuf[FILENAME_MAX], *homedir = getenv("HOME");
  if (!homedir) return;
  snprintf(filenamebuf, FILENAME_MAX, "%s/.pd-l2ork/recent_files", homedir);
  filenamebuf[FILENAME_MAX-1] = 0;
  if ((fp = fopen(filenamebuf, "r")) == NULL) return;
  for (sys_n_recent_files = 0; sys_n_recent_files < MAX_RECENT_FILES &&
         fgets(filenamebuf, FILENAME_MAX, fp); ) {
    char *s;
    int l = strlen(filenamebuf);
    if (l > 0 && filenamebuf[l-1] == '\n') filenamebuf[--l] = 0;
    // only add files which actually exist
    if (l == 0 || !fexists(filenamebuf)) continue;
    s = strdup(filenamebuf);
    if (s) sys_recent_files[sys_n_recent_files++] = s;
  }
  fclose(fp);
#else
  // Mac/Windows (use the defaults/registry)
  char prefbuf[MAXPDSTRING], keybuf[80];
  int i, maxi = MAX_RECENT_FILES;
  sys_initloadpreferences();
  if (sys_getpreference("nrecent", prefbuf, MAXPDSTRING))
    sscanf(prefbuf, "%d", &maxi);
  for (i = 0; i < maxi; i++) {
    int l;
    char *s;
    sprintf(keybuf, "recent%d", i+1);
    if (!sys_getpreference(keybuf, prefbuf, MAXPDSTRING))
      break;
    l = strlen(prefbuf);
    if (l == 0 || !fexists(prefbuf)) continue;
    s = strdup(prefbuf);
    if (s) sys_recent_files[sys_n_recent_files++] = s;
  }
  sys_doneloadpreferences();
#endif
}

void sys_clear_recent_files(void)
{
  int i;
  for (i = 0; i < sys_n_recent_files; i++) {
    free(sys_recent_files[i]);
  }
  sys_n_recent_files = 0;
}

// send the recent files list back to the gui so that the Recent Files menu
// can be updated accordingly
void glob_recent_files(t_pd *dummy)
{
    int i;
    gui_start_vmess("gui_recent_files", "x", dummy);
    gui_start_array();
    for (i = 0; i < sys_n_recent_files; i++)
    {
        gui_s(sys_recent_files[i]);
    }
    gui_end_array();
    gui_end_vmess();
}

// add an entry to the recent files list, save the list and update the gui
void glob_add_recent_file(t_pd *dummy, t_symbol *s)
{
    sys_add_recent_file(s->s_name);
    sys_save_recent_files();
    glob_recent_files(dummy);
}

// clear the recent files list, save the list and update the gui
void glob_clear_recent_files(t_pd *dummy)
{
    sys_clear_recent_files();
    sys_save_recent_files();
    glob_recent_files(dummy);
}