sim: mcuboot-sys: Add support for limited sector size information

Adds support for getting the sector size of less sectors than are
in an image, which mirrors support in zephyr and allows getting
just the size of the first sector in an image

Signed-off-by: Jamie McCrae <jamie.mccrae@nordicsemi.no>

sim/mcuboot-sys/csupport/run.c

@@ -7,6 +7,7 @@
 #include <string.h>
 #include <bootutil/bootutil.h>
 #include <bootutil/image.h>
+#include <errno.h>
 
 #include <flash_map_backend/flash_map_backend.h>
 
@@ -369,6 +370,7 @@ int flash_area_erase(const struct flash_area *area, uint32_t off, uint32_t len)
 
 int flash_area_to_sectors(int idx, int *cnt, struct flash_area *ret)
 {
+    int rc = 0;
     uint32_t i;
     struct area *slot;
     struct area_desc *flash_areas;
@@ -385,20 +387,21 @@ int flash_area_to_sectors(int idx, int *cnt, struct flash_area *ret)
 
     slot = &flash_areas->slots[i];
 
-    if (slot->num_areas > (uint32_t)*cnt) {
-        printf("Too many areas in slot\n");
-        abort();
+    if ((uint32_t)*cnt > slot->num_areas) {
+        *cnt = slot->num_areas;
+    } else if (slot->num_areas > (uint32_t)*cnt) {
+        rc = -ENOMEM;
     }
 
-    *cnt = slot->num_areas;
-    memcpy(ret, slot->areas, slot->num_areas * sizeof(struct flash_area));
+    memcpy(ret, slot->areas, *cnt * sizeof(struct flash_area));
 
-    return 0;
+    return rc;
 }
 
 int flash_area_get_sectors(int fa_id, uint32_t *count,
                            struct flash_sector *sectors)
 {
+    int rc = 0;
     uint32_t i;
     struct area *slot;
     struct area_desc *flash_areas;
@@ -415,19 +418,19 @@ int flash_area_get_sectors(int fa_id, uint32_t *count,
 
     slot = &flash_areas->slots[i];
 
-    if (slot->num_areas > *count) {
-        printf("Too many areas in slot\n");
-        abort();
+    if (*count > slot->num_areas) {
+        *count = slot->num_areas;
+    } else if (slot->num_areas > *count) {
+        rc = -ENOMEM;
     }
 
-    for (i = 0; i < slot->num_areas; i++) {
+    for (i = 0; i < *count; i++) {
         sectors[i].fs_off = slot->areas[i].fa_off -
             slot->whole.fa_off;
         sectors[i].fs_size = slot->areas[i].fa_size;
     }
-    *count = slot->num_areas;
 
-    return 0;
+    return rc;
 }
 
 int flash_area_id_to_multi_image_slot(int image_index, int area_id)