hdt: Adding postexec= option

When HDT is exiting, you might need executing something else.
This could be used in the following scenario :

You start HDT, do an automatic command like 'dump; exit', but then after
you might need to launch something else from syslinux.

The postexec option will allow you to define what label you'd love
running one HDT got terminated.

Syntaxt is like the following:

postexec='menu_label_to_run_once_hdt_got_exited'

Note the quotes (') after the equal sign (=)

This could looks like :
APPEND auto='dump; exit' postexec='memtest'

com32/hdt/hdt-common.c

@@ -115,6 +115,27 @@ void detect_parameters(const int argc, const char *argv[],
 	} else if (!strncmp(argv[i], "tftp_ip=", 8)) {
 	    strlcpy(hardware->tftp_ip, argv[i] + 8,
 		    sizeof(hardware->tftp_ip));
+	} else if (!strncmp(argv[i], "postexec=", 9)) {
+	    /* The postexec= parameter is separated in several argv[]
+	     * as it can contains spaces.
+	     * We use the AUTO_DELIMITER char to define the limits
+	     * of this parameter.
+	     * i.e postexec='linux memtest.bin'
+	     */
+
+	    char *argument = (char*)argv[i]+10;
+	    /* Extracting the first parameter */
+	    strcpy(hardware->postexec, argument);
+
+	    /* While we can't find the other AUTO_DELIMITER, let's process the argv[] */
+	    while ((strchr(argument, AUTO_DELIMITER) == NULL) && (i+1<argc)) {
+		i++;
+	    	argument = (char *)argv[i];
+		strcat(hardware->postexec, " ");
+		strcat(hardware->postexec, argument);
+	    } 
+
+	     hardware->postexec[strlen(hardware->postexec) - 1] = 0;
 	} else if (!strncmp(argv[i], "auto=", 5)) {
 	    /* The auto= parameter is separated in several argv[]
 	     * as it can contains spaces.
@@ -210,6 +231,7 @@ void init_hardware(struct s_hardware *hardware)
     memset(hardware->dump_filename, 0, sizeof hardware->dump_filename);
     memset(hardware->vesa_background, 0, sizeof hardware->vesa_background);
     memset(hardware->tftp_ip, 0, sizeof hardware->tftp_ip);
+    memset(hardware->postexec, 0, sizeof hardware->postexec);
     strcat(hardware->dump_path, "hdt");
     strcat(hardware->dump_filename, "%{m}+%{p}+%{v}");
     strcat(hardware->pciids_path, "pci.ids");

com32/hdt/hdt-common.h

@@ -219,6 +219,7 @@ struct s_hardware {
     char memtest_label[255];
     char auto_label[AUTO_COMMAND_SIZE];
     char vesa_background[255];
+    char postexec[255];
 };
 
 void reset_more_printf(void);

com32/hdt/hdt.c

@@ -74,14 +74,21 @@ int main(const int argc, const char *argv[])
 
     printf("%s\n", version_string);
 
+    int return_code = 0;
+
     if (!menumode || automode)
 	start_cli_mode(&hardware);
     else {
-	int return_code = start_menu_mode(&hardware, version_string);
+	return_code = start_menu_mode(&hardware, version_string);
 	if (return_code == HDT_RETURN_TO_CLI)
 	    start_cli_mode(&hardware);
-	else
-	    return return_code;
     }
-    return 0;
+
+    /* Do we got request to do something at exit time ? */
+    if (strlen(hardware.postexec)>0) {
+	    printf("Executing postexec instructions : %s\n",hardware.postexec);
+	    runsyslinuxcmd(hardware.postexec);
+    }
+
+    return return_code;
 }