layout.c: Don't use global variables for included regions

This removes the use of global variables for included region arguments
and also uses a linked list to store the arguments.

Change-Id: I6534cc58b8dcc6256c2730c809286d8083669a6c
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/31247
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

cli_classic.c

@@ -151,6 +151,7 @@ int main(int argc, char *argv[])
 #endif /* !STANDALONE */
 	char *tempstr = NULL;
 	char *pparam = NULL;
+	struct layout_include_args *include_args = NULL;
 
 	flashrom_set_log_callback((flashrom_log_callback *)&flashrom_print_cb);
 
@@ -290,7 +291,7 @@ int main(int argc, char *argv[])
 			break;
 		case 'i':
 			tempstr = strdup(optarg);
-			if (register_include_arg(tempstr)) {
+			if (register_include_arg(&include_args, tempstr)) {
 				free(tempstr);
 				cli_classic_abort_usage();
 			}
@@ -452,7 +453,7 @@ int main(int argc, char *argv[])
 		goto out;
 	}
 
-	if (!ifd && !fmap && process_include_args(get_global_layout())) {
+	if (!ifd && !fmap && process_include_args(get_global_layout(), include_args)) {
 		ret = 1;
 		goto out;
 	}
@@ -608,7 +609,7 @@ int main(int argc, char *argv[])
 	if (layoutfile) {
 		layout = get_global_layout();
 	} else if (ifd && (flashrom_layout_read_from_ifd(&layout, fill_flash, NULL, 0) ||
-			   process_include_args(layout))) {
+			   process_include_args(layout, include_args))) {
 		ret = 1;
 		goto out_shutdown;
 	} else if (fmap && fmapfile) {
@@ -633,14 +634,14 @@ int main(int argc, char *argv[])
 		}
 
 		if (flashrom_layout_read_fmap_from_buffer(&layout, fill_flash, fmapfile_buffer, fmapfile_size) ||
-				process_include_args(layout)) {
+		    process_include_args(layout, include_args)) {
 			ret = 1;
 			free(fmapfile_buffer);
 			goto out_shutdown;
 		}
 		free(fmapfile_buffer);
 	} else if (fmap && (flashrom_layout_read_fmap_from_rom(&layout, fill_flash, 0,
-				fill_flash->chip->total_size * 1024) || process_include_args(layout))) {
+		       fill_flash->chip->total_size * 1024) || process_include_args(layout, include_args))) {
 		ret = 1;
 		goto out_shutdown;
 	}
@@ -675,7 +676,7 @@ out:
 	for (i = 0; i < chipcount; i++)
 		free(flashes[i].chip);
 
-	layout_cleanup();
+	layout_cleanup(&include_args);
 	free(filename);
 	free(fmapfile);
 	free(referencefile);

flash.h

@@ -391,10 +391,10 @@ __attribute__((format(printf, 2, 3)));
 #define msg_cspew(...)	print(FLASHROM_MSG_SPEW, __VA_ARGS__)	/* chip debug spew  */
 
 /* layout.c */
-int register_include_arg(char *name);
+int register_include_arg(struct layout_include_args **args, char *name);
 int read_romlayout(const char *name);
 int normalize_romentries(const struct flashctx *flash);
-void layout_cleanup(void);
+void layout_cleanup(struct layout_include_args **args);
 
 /* spi.c */
 struct spi_command {

layout.c

@@ -26,11 +26,6 @@
 struct romentry entries[MAX_ROMLAYOUT];
 static struct flashrom_layout layout = { entries, 0 };
 
-/* include_args holds the arguments specified at the command line with -i. They must be processed at some point
- * so that desired regions are marked as "included" in the layout. */
-static char *include_args[MAX_ROMLAYOUT];
-static int num_include_args = 0; /* the number of valid include_args. */
-
 struct flashrom_layout *get_global_layout(void)
 {
 	return &layout;
@@ -101,37 +96,34 @@ int read_romlayout(const char *name)
 }
 #endif
 
-/* returns the index of the entry (or a negative value if it is not found) */
-static int find_include_arg(const char *const name)
-{
-	unsigned int i;
-	for (i = 0; i < num_include_args; i++) {
-		if (!strcmp(include_args[i], name))
-			return i;
-	}
-	return -1;
-}
-
 /* register an include argument (-i) for later processing */
-int register_include_arg(char *name)
+int register_include_arg(struct layout_include_args **args, char *name)
 {
-	if (num_include_args >= MAX_ROMLAYOUT) {
-		msg_gerr("Too many regions included (%i).\n", num_include_args);
-		return 1;
-	}
-
+	struct layout_include_args *tmp;
 	if (name == NULL) {
 		msg_gerr("<NULL> is a bad region name.\n");
 		return 1;
 	}
 
-	if (find_include_arg(name) != -1) {
+	tmp = *args;
+	while (tmp) {
+		if (!strcmp(tmp->name, name)) {
 			msg_gerr("Duplicate region name: \"%s\".\n", name);
 			return 1;
 		}
+		tmp = tmp->next;
+	}
+
+	tmp = malloc(sizeof(struct layout_include_args));
+	if (tmp == NULL) {
+		msg_gerr("Could not allocate memory");
+		return 1;
+	}
+
+	tmp->name = name;
+	tmp->next = *args;
+	*args = tmp;
 
-	include_args[num_include_args] = name;
-	num_include_args++;
 	return 0;
 }
 
@@ -153,45 +145,54 @@ static int find_romentry(struct flashrom_layout *const l, char *name)
 /* process -i arguments
  * returns 0 to indicate success, >0 to indicate failure
  */
-int process_include_args(struct flashrom_layout *const l)
+int process_include_args(struct flashrom_layout *l, const struct layout_include_args *const args)
 {
-	int i;
+	int found = 0;
+	const struct layout_include_args *tmp;
 
-	if (num_include_args == 0)
+	if (args == NULL)
 		return 0;
 
 	/* User has specified an area, but no layout file is loaded. */
 	if (l->num_entries == 0) {
 		msg_gerr("Region requested (with -i \"%s\"), "
 			 "but no layout data is available.\n",
-			 include_args[0]);
+			 args->name);
 		return 1;
 	}
 
-	for (i = 0; i < num_include_args; i++) {
-		if (find_romentry(l, include_args[i]) < 0) {
+	tmp = args;
+	while (tmp) {
+		if (find_romentry(l, tmp->name) < 0) {
 			msg_gerr("Invalid region specified: \"%s\".\n",
-				 include_args[i]);
+				 tmp->name);
 			return 1;
 		}
+		tmp = tmp->next;
+		found++;
 	}
 
-	msg_ginfo("Using region%s: \"%s\"", num_include_args > 1 ? "s" : "",
-		  include_args[0]);
-	for (i = 1; i < num_include_args; i++)
-		msg_ginfo(", \"%s\"", include_args[i]);
+	msg_ginfo("Using region%s:", found > 1 ? "s" : "");
+	tmp = args;
+	while (tmp) {
+		msg_ginfo(" \"%s\"%s", tmp->name, found > 1 ? "," : "");
+		found--;
+		tmp = tmp->next;
+	}
 	msg_ginfo(".\n");
 	return 0;
 }
 
-void layout_cleanup(void)
+void layout_cleanup(struct layout_include_args **args)
 {
 	int i;
-	for (i = 0; i < num_include_args; i++) {
-		free(include_args[i]);
-		include_args[i] = NULL;
+	struct layout_include_args *tmp;
+
+	while (*args) {
+		tmp = (*args)->next;
+		free(*args);
+		*args = tmp;
 	}
-	num_include_args = 0;
 
 	for (i = 0; i < layout.num_entries; i++) {
 		layout.entries[i].included = 0;

layout.h

@@ -54,11 +54,16 @@ struct single_layout {
 	struct romentry entry;
 };
 
+struct layout_include_args {
+	char *name;
+	struct layout_include_args *next;
+};
+
 struct flashrom_layout *get_global_layout(void);
 struct flashrom_flashctx;
 const struct flashrom_layout *get_layout(const struct flashrom_flashctx *const flashctx);
 
-int process_include_args(struct flashrom_layout *);
+int process_include_args(struct flashrom_layout *l, const struct layout_include_args *const args);
 const struct romentry *layout_next_included_region(const struct flashrom_layout *, chipoff_t);
 
 #endif				/* !__LAYOUT_H__ */