Flashrom does not honor argument ordering for operations

Not only does this violate the principle of least surprise, it also
caused one bug where -Ewv was specified and the flash ended up being
empty.

Support only one operation at a time. As a side benefit, this allows us
to clean up main() quite a bit.

Corresponding to flashrom svn r585.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>

flashrom.8

@@ -2,7 +2,7 @@
 .SH NAME
 flashrom \- detect, read, write, verify and erase flash chips
 .SH SYNOPSIS
-.B flashrom \fR[\fB\-EVfLhR\fR] [\fB\-r\fR file] [\fB\-w\fR file] [\fB\-v\fR file]
+.B flashrom \fR[\fB\-VfLhR\fR] [\fB\-E\fR|\fB\-r\fR file|\fB\-w\fR file|\fB\-v\fR file]
          [\fB\-c\fR chipname] [\fB\-s\fR addr] [\fB\-e\fR addr] [\fB\-m\fR [vendor:]part]
          [\fB\-l\fR file] [\fB\-i\fR image] [\fB\-p\fR programmer] [file]
 .SH DESCRIPTION
@@ -25,7 +25,8 @@ Please note that the command line interface for flashrom will change before
 flashrom 1.0. Do not use flashrom in scripts or other automated tools without
 checking that your flashrom version won't interpret options in a different way.
 .PP
-If no file is specified, then all that happens
+You can specify one of -E, -r, -w, -v or no operation.
+If no operation is specified, then all that happens
 is that flash info is dumped and the flash chip is set to writable.
 .TP
 .B "\-r, \-\-read <file>"

flashrom.c

@@ -471,7 +471,7 @@ void print_supported_chips(void)
 
 void usage(const char *name)
 {
-	printf("usage: %s [-EVfLhR] [-r file] [-w file] [-v file] [-c chipname] [-s addr]\n"
+	printf("usage: %s [-VfLhR] [-E|-r file|-w file|-v file] [-c chipname] [-s addr]\n"
 	       "       [-e addr] [-m [vendor:]part] [-l file] [-i image] [-p programmer] [file]\n\n",
 	       name);
 
@@ -498,7 +498,8 @@ void usage(const char *name)
 	     "                                     (internal, dummy, nic3com, satasii, it87spi)\n"
 	     "   -h | --help:                      print this help text\n"
 	     "   -R | --version:                   print the version (release)\n"
-	     "\nIf no file is specified, then all that happens"
+	     "\nYou can specify one of -E, -r, -w, -v or no operation.\n"
+	     "If no operation is specified, then all that happens"
 	     " is that flash info is dumped.\n\n");
 	exit(1);
 }
@@ -520,6 +521,7 @@ int main(int argc, char *argv[])
 	int force = 0;
 	int read_it = 0, write_it = 0, erase_it = 0, verify_it = 0;
 	int list_supported = 0;
+	int operation_specified = 0;
 	int ret = 0, i;
 
 	static struct option long_options[] = {
@@ -562,12 +564,27 @@ int main(int argc, char *argv[])
 				  long_options, &option_index)) != EOF) {
 		switch (opt) {
 		case 'r':
+			if (++operation_specified > 1) {
+				fprintf(stderr, "More than one operation "
+					"specified. Aborting.\n");
+				exit(1);
+			}
 			read_it = 1;
 			break;
 		case 'w':
+			if (++operation_specified > 1) {
+				fprintf(stderr, "More than one operation "
+					"specified. Aborting.\n");
+				exit(1);
+			}
 			write_it = 1;
 			break;
 		case 'v':
+			if (++operation_specified > 1) {
+				fprintf(stderr, "More than one operation "
+					"specified. Aborting.\n");
+				exit(1);
+			}
 			verify_it = 1;
 			break;
 		case 'c':
@@ -577,6 +594,11 @@ int main(int argc, char *argv[])
 			verbose = 1;
 			break;
 		case 'E':
+			if (++operation_specified > 1) {
+				fprintf(stderr, "More than one operation "
+					"specified. Aborting.\n");
+				exit(1);
+			}
 			erase_it = 1;
 			break;
 		case 's':