patch #7699 Read additional config files

* main.c: Added reading of additional config files
* avrdude.1: updated man page
* doc/avrdude.texi: updated documentation


git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@1038 81a1dc3b-b13d-400b-aceb-764788c761c2

ChangeLog

@@ -1,3 +1,10 @@
+2012-01-10  Rene Liebscher <R.Liebscher@gmx.de>
+
+	patch #7699 Read additional config files
+	* main.c: Added reading of additional config files
+	* avrdude.1: updated man page
+	* doc/avrdude.texi: updated documentation
+
 2012-01-10  Joerg Wunsch <j.gnu@uriah.heep.sax.de>
 
 	Submitted by Bob Frazier:

avrdude.1

@@ -269,6 +269,16 @@ submit a patch back to the author so that it can be incorporated for
 the next version).  See the config file, located at
 .Pa ${PREFIX}/etc/avrdude.conf ,
 which contains a description of the format.
+.Pp
+If 
+.Ar config-file
+is written as
+.Pa +filename
+then this file is read after the system wide and user configuration
+files. This can be used to add entries to the configuration
+without patching your system wide configuration file. It can be used
+several times, the files are read in same order as given on the command
+line.
 .It Fl D
 Disable auto erase for flash.  When the
 .Fl U

doc/avrdude.texi

@@ -513,6 +513,14 @@ specified, AVRDUDE reads the configuration file from
 /usr/local/etc/avrdude.conf (FreeBSD and Linux). See Appendix A for
 the method of searching for the configuration file for Windows.
 
+If @var{config-file} is written as @var{+filename}
+then this file is read after the system wide and user configuration 
+files. This can be used to add entries to the configuration
+without patching your system wide configuration file. It can be used 
+several times, the files are read in same order as given on the command 
+line.
+
+
 @item -D
 Disable auto erase for flash.  When the -U option with flash memory is 
 specified, avrdude will perform a chip erase before starting any of the 

main.c

@@ -75,6 +75,8 @@ static LISTID updates;
 
 static LISTID extended_params;
 
+static LISTID additional_config_files;
+
 static PROGRAMMER * pgm;
 
 /*
@@ -342,6 +344,12 @@ int main(int argc, char * argv [])
     exit(1);
   }
 
+  additional_config_files = lcreat(NULL, 0);
+  if (additional_config_files == NULL) {
+    fprintf(stderr, "%s: cannot initialize additional config files list\n", progname);
+    exit(1);
+  }
+
   partdesc      = NULL;
   port          = default_parallel;
   erase         = 0;
@@ -448,8 +456,12 @@ int main(int argc, char * argv [])
         break;
 
       case 'C': /* system wide configuration file */
+        if (optarg[0] == '+') {
+          ladd(additional_config_files, optarg+1);
+        } else {
           strncpy(sys_config, optarg, PATH_MAX);
           sys_config[PATH_MAX-1] = 0;
+        }
         break;
 
       case 'D': /* disable auto erase */
@@ -620,6 +632,28 @@ int main(int argc, char * argv [])
       }
     }
   }
+
+  if (lsize(additional_config_files) > 0) {
+    LNODEID ln1;
+    const char * p = NULL;
+
+    for (ln1=lfirst(additional_config_files); ln1; ln1=lnext(ln1)) {
+      p = ldata(ln1);
+      if (verbose) {
+        fprintf(stderr, "%sAdditional configuration file is \"%s\"\n",
+                progbuf, p);
+      }
+
+      rc = read_config(p);
+      if (rc) {
+        fprintf(stderr,
+                "%s: error reading additional configuration file \"%s\"\n",
+                progname, p);
+        exit(1);
+      }
+    }
+  }
+
   // set bitclock from configuration files unless changed by command line
   if (default_bitclock > 0 && bitclock == 0.0) {
     bitclock = default_bitclock;