parse commandline, create symbolic links - used posix functions

dvdplugin.c

@@ -1,4 +1,4 @@
-#include <vdr/remote.h>
+
 #include <vdr/plugin.h>
 #include <vdr/player.h>
 #include <unistd.h>
@@ -62,63 +62,68 @@ cDVDPluginThread *cDVDPlugin::thread = NULL;
 
 void cDVDPlugin::DetectDevice(void)
 {
-  dsyslog("dvdswitch: Scan for DVD Device");
-  char *cmd = NULL;
-  char *output = NULL;
+  dsyslog("dvdswitch: parse cmdline of dvd-plugin for DVD Device");
+  char *file = NULL;
   char *dvd = NULL;
 
-  if(0 < asprintf(&cmd, "ps -p %i -o cmd --no-header", getpid())) {
-    dsyslog("dvdswitch: Command: %s", cmd);
-
-    FILE *p = popen(cmd, "r");
-    if(p)
-    {
-  #if VDRVERSNUM >= 10318
-      cReadLine rl;
-      output = rl.Read(p);
-  #else
-      output = readline(p);
-  #endif
-      pclose(p);
+  if(0 < asprintf(&file, "/proc/%i/cmdline", getpid())) {
+    /* read /proc/`pidof vdr`/cmdline */
+    char buffer[1024];
+    int len = -1;
+
+    int fd = open(file,O_RDONLY);
+    if (fd >= 0) {
+      do {
+          len = read(fd,buffer,sizeof(buffer)); }
+      while (len == -1 && errno == EINTR);
+      close(fd);
+    } else {
+      char* szErr = get_strerror(errno);
+      esyslog("dvdswitch: could not open %s:%s", file, szErr ? szErr : "");
+      if(szErr) free(szErr);
     }
-
-    cTokenizer *token = new cTokenizer(output, " ");
-    for(int i = 1; i <= token->Count(); i++)
-    {
-      if(RegIMatch(token->GetToken(i), "^--plugin=dvd") ||
-         (RegIMatch(token->GetToken(i - 1), "^-P$") &&
-          RegIMatch(token->GetToken(i), "^dvd$")))
-      {
-        if(RegIMatch(token->GetToken(i + 1), "^-C$") &&
-           token->GetToken(i + 2))
-        {
-          dvd = strdup(token->GetToken(i + 2));
-          break;
-        }
-        if(RegIMatch(token->GetToken(i + 1), "^--dvd="))
-        {
-          const char *p = strchr(token->GetToken(i + 1), '=');
-          p++;
-          dvd = strdup(p);
-          break;
+    free(file);
+
+    if (len < 0) {
+      char* szErr = get_strerror(errno);
+      esyslog("dvdswitch: could not read %s:%s", file, szErr ? szErr : "");
+      if(szErr) free(szErr);
+    } else {
+      char *output = NULL;
+      for(int n = 0; n < len && !dvd;n += (strlen(output) + 1)) {
+        output = buffer + n;
+        //dsyslog("dvdswitch: parse '%s'", output);
+        if(0 == strncmp(output, "--plugin=dvd ",13)
+            || 0 == strncmp(output, "-Pdvd ",6)
+            || 0 == strncmp(output, "-P dvd ",7)
+            || 0 == strncmp(output, "-P'dvd ",7)
+            || 0 == strncmp(output, "-P\"dvd ",7)) {
+
+        cTokenizer *token = new cTokenizer(output, " ");
+        for(int i = 0; i <= token->Count(); i++) {
+            if(RegIMatch(token->GetToken(i), "^-C$") &&
+               token->GetToken(i + 1)) {
+              dvd = strdup(token->GetToken(i + 1));
+              break;
+            }
+            if(RegIMatch(token->GetToken(i), "^--dvd=")) {
+              const char *p = strchr(token->GetToken(i), '=');
+              dvd = strdup(p + 1);
+              break;
+            }
+          }
+          DELETENULL(token);
         }
       }
     }
-    DELETENULL(token);
-
-    if(dvd)
-    {
-      isyslog("dvdswitch: Used DVD Device: %s", dvd);
+    if(!dvd) {
+      dvd = strdup("/dev/dvd");
+    }
+    if(dvd) {
+      isyslog("dvdswitch: use DVD Device: %s", dvd);
       DVDSwitchSetup.SetDVDDevice(dvd);
       free(dvd);
     }
-    else
-    {
-      isyslog("dvdswitch: Use Default-DVD Device /dev/dvd");
-      DVDSwitchSetup.SetDVDDevice("/dev/dvd");
-    }
-
-    free(cmd);
   }
 }
 
@@ -163,14 +168,17 @@ void cDVDPlugin::ChangeLink(char *target)
 {
   if(target)
   {
-    char *cmd = NULL;
-    int rc = 0;
-
-    if(0 < asprintf(&cmd, LINK, target, DVDSwitchSetup.DVDLink)) {
-      dsyslog("dvdswitch: Change link: %s", cmd);
-      rc = system(cmd);
-      dsyslog("dvdswitch: Change link got: %i", rc);
-      free(cmd);
+    isyslog("dvdswitch: create link %s to %s", DVDSwitchSetup.DVDLink, target);
+
+    if(-1 == unlink(DVDSwitchSetup.DVDLink) && errno != ENOENT) {
+      char* szErr = get_strerror(errno);
+      esyslog("dvdswitch: could not remove symbolic link %s : %s (%d)", DVDSwitchSetup.DVDLink, szErr ? szErr : "", errno);
+      if(szErr) free(szErr);
+    }
+    if(-1 == symlink(target, DVDSwitchSetup.DVDLink)) {
+      char* szErr = get_strerror(errno);
+      esyslog("dvdswitch: could not create link %s to %s :%s (%d)", DVDSwitchSetup.DVDLink, target, szErr ? szErr : "", errno);
+      if(szErr) free(szErr);
     }
   }
 }

dvdplugin.h

@@ -5,8 +5,6 @@
 #include "helpers.h"
 #include "setup.h"
 
-#define LINK "ln -nfs '%s' '%s' 2> /dev/null"
-
 class cDVDPluginThread : public cThread
 {
   private:

dvdswitch.c

@@ -19,9 +19,7 @@
 #error "VDR-1.6.0 API version or greater is required!"
 #endif
 
-static const char *VERSION        = "0.1.6";
-static const char *DESCRIPTION    = tr("Allowed to play DVD-Images");
-//static const char *MAINMENUENTRY  = tr("DVDSwitch");
+static const char *VERSION        = "0.1.7";
 
 class cPluginDvdswitch : public cPlugin {
 private:
@@ -33,7 +31,7 @@ class cPluginDvdswitch : public cPlugin {
   cPluginDvdswitch(void);
   virtual ~cPluginDvdswitch();
   virtual const char *Version(void) { return VERSION; }
-  virtual const char *Description(void) { return tr(DESCRIPTION); }
+  virtual const char *Description(void) { return tr("Allows playback of DVD images"); }
   virtual const char *CommandLineHelp(void);
   virtual bool ProcessArgs(int argc, char *argv[]);
   virtual bool Initialize(void);

helpers.c

@@ -23,27 +23,23 @@ void OsdMsg(eMessageType Type, const char *Msg)
 #endif
 }
 
-void OSDErrorNumMsg(int err, const char* szDef) 
-{	
-    char szErr[128];
-    int nErr = err;
-    szErr[sizeof(szErr)-1] = '\0';
-    if(0 != strerror_r(nErr,szErr,sizeof(szErr)-1)) {
-        szErr[0] = '\0';
-    } 
-    esyslog(szErr[0] != '\0'?szErr:szDef);
-    OsdMsg(mtError, szErr[0] != '\0'?szErr:szDef);
-}
+char *get_strerror(int n) 
+{ 
+    char *s; 
+    size_t size = 128; 
+    s = (char*)malloc(size); 
+    if (s == NULL) 
+        return NULL;
+    strerror_r(n, s, size);
+    return s; 
+} 
 
-void SysLogErrorNumMsg(int err, const char* szDef) 
+void OSDErrorNumMsg(int err, const char* szDef) 
 {	
-    char szErr[128];
-    int nErr = err;
-    szErr[sizeof(szErr)-1] = '\0';
-    if(0 != strerror_r(nErr,szErr,sizeof(szErr)-1)) {
-        szErr[0] = '\0';
-    } 
-    esyslog(szErr[0] != '\0'?szErr:szDef);
+    char* szErr = get_strerror(err);
+    esyslog("dvdswitch: %s :%s", szDef, szErr ? szErr : "");
+    OsdMsg(mtError, szErr ? szErr : szDef);
+    if(szErr) free(szErr);
 }
 
 void ChangeChars(char *name, char *chars)

helpers.h

@@ -17,10 +17,10 @@
 
 void OsdMsg(eMessageType Type, const char *Msg);
 void OSDErrorNumMsg(int err, const char* szDef);
-void SysLogErrorNumMsg(int err, const char* szDef);
 void ChangeChars(char *name, char *chars);
 void StrRepeat(const char *input, int count, char *dest);
 bool RegIMatch(const char *string,const char *pattern);
+char *get_strerror(int n);
 
 // --- cStringValue -------------------------------------
 

po/de_DE.po

@@ -5,7 +5,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: vdr-dvdswitch-plugin 0.1.6\n"
 "Report-Msgid-Bugs-To: <see README>\n"
-"POT-Creation-Date: 2010-12-21 21:35+0100\n"
+"POT-Creation-Date: 2010-12-23 20:45+0100\n"
 "PO-Revision-Date: 2009-10-03 14:03+0200\n"
 "Last-Translator:\n"
 "Language-Team: <[email protected]>\n"
@@ -140,7 +140,7 @@ msgstr "Es wurde kein Verzeichnis ausgew
 msgid "Now Read?"
 msgstr "Jetzt einlesen?"
 
-msgid "Allowed to play DVD-Images"
+msgid "Allows playback of DVD images"
 msgstr "Erlaubt das Abspielen von DVD-Abbildern"
 
 msgid "Image Directory not readable or not exist"

po/fr_FR.po

@@ -10,7 +10,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: vdr-dvdswitch-plugin 0.1.6\n"
 "Report-Msgid-Bugs-To: <see README>\n"
-"POT-Creation-Date: 2010-12-21 21:35+0100\n"
+"POT-Creation-Date: 2010-12-23 20:45+0100\n"
 "PO-Revision-Date: 2010-12-21 12:59+0100\n"
 "Last-Translator: Nicolas Huillard <[email protected]>\n"
 "Language-Team: <[email protected]>\n"
@@ -149,7 +149,7 @@ msgstr "Aucun dossier n'est choisi. Utiliser le standard?"
 msgid "Now Read?"
 msgstr "Lire maintenant?"
 
-msgid "Allowed to play DVD-Images"
+msgid "Allows playback of DVD images"
 msgstr ""
 
 msgid "Image Directory not readable or not exist"

tools.c

@@ -72,8 +72,11 @@ void cFileDelThread::Action(void)
   if(File) {
     dsyslog("dvdswitch: Execute remove %s",File);
     errno = 0;
-    if(!cFileCMD::Del(File))
-      SysLogErrorNumMsg(errno,"Operation file remove failed");
+    if(!cFileCMD::Del(File)) {
+      char* err = get_strerror(errno);
+      esyslog("dvdswitch: could not remove failed %s :%s", File, err ? err : "");
+      if(err) free(err);
+    }
   }
   delete(this);
 };
@@ -134,8 +137,11 @@ void cFileMoveThread::Action(void)
     if(0 < asprintf(&buffer, "%s/%s", Dest, FileName)) {
       dsyslog("dvdswitch: Execute move %s to %s",File, buffer);
       errno = 0;
-      if(!cFileCMD::Rn(File, buffer))
-        SysLogErrorNumMsg(errno,"Operation file remove failed");
+      if(!cFileCMD::Rn(File, buffer)) {
+        char* err = get_strerror(errno);
+        esyslog("dvdswitch: could not move file failed %s to %s :%s", File, buffer, err ? err : "");
+        if(err) free(err);
+      }
       free(buffer);
     }
   }