From 16fd74f0cafaf903c065047241a87ee2649238e1 Mon Sep 17 00:00:00 2001
From: Alex Kotov <kotovalexarian@gmail.com>
Date: Mon, 30 Nov 2020 23:07:18 +0500
Subject: [PATCH] Implement PFA initialization

---
 include/kernaux/pfa.h |  2 +-
 src/pfa.c             | 35 +++++++++++++++++++++++++++++++++++
 2 files changed, 36 insertions(+), 1 deletion(-)

diff --git a/include/kernaux/pfa.h b/include/kernaux/pfa.h
index 5489c2c..d624008 100644
--- a/include/kernaux/pfa.h
+++ b/include/kernaux/pfa.h
@@ -3,10 +3,10 @@
 
 #include <kernaux/stdlib.h>
 
+#define KERNAUX_PFA_PAGE_SIZE (4 * 1024)
 #define KERNAUX_PFA_ZONES_COUNT_MAX 10
 #define KERNAUX_PFA_ZONE_NAME_SIZE_MAX 256
 #define KERNAUX_PFA_ZONE_NAME_SLEN_MAX (KERNAUX_PFA_ZONE_NAME_SIZE_MAX - 1)
-#define KERNAUX_PFA_PAGE_SIZE (4 * 1024)
 #define KERNAUX_PFA_ZONE_PAGES_COUNT_MAX (1024 * 1024)
 #define KERNAUX_PFA_ZONE_PAGE_LIST_SIZE (KERNAUX_PFA_ZONE_PAGES_COUNT_MAX / 8)
 
diff --git a/src/pfa.c b/src/pfa.c
index 9f2b3de..0e36ca1 100644
--- a/src/pfa.c
+++ b/src/pfa.c
@@ -1,6 +1,7 @@
 #include "config.h"
 
 #include <kernaux/pfa.h>
+#include <kernaux/stdlib.h>
 
 kernaux_bool KernAux_PFA_initialize_start(
     struct KernAux_PFA *const pfa
@@ -14,6 +15,8 @@ kernaux_bool KernAux_PFA_initialize_start(
     }
 
     pfa->zones_count = 0;
+
+    return KERNAUX_TRUE;
 }
 
 kernaux_bool KernAux_PFA_initialize_add_zone(
@@ -29,6 +32,34 @@ kernaux_bool KernAux_PFA_initialize_add_zone(
     if (pfa->zones_count >= KERNAUX_PFA_ZONES_COUNT_MAX) {
         return KERNAUX_FALSE;
     }
+
+    if (start >= end) {
+        return KERNAUX_FALSE;
+    }
+
+    if (start % KERNAUX_PFA_PAGE_SIZE != 0) {
+        return KERNAUX_FALSE;
+    }
+
+    if ((end + 1) % KERNAUX_PFA_PAGE_SIZE != 0) {
+        return KERNAUX_FALSE;
+    }
+
+    const unsigned int name_slen = kernaux_strlen(name);
+
+    if (name_slen > KERNAUX_PFA_ZONE_NAME_SLEN_MAX) {
+        return KERNAUX_FALSE;
+    }
+
+    struct KernAux_PFA_Zone *const zone = &pfa->zones[pfa->zones_count++];
+
+    kernaux_strncpy(zone->name, name, name_slen);
+
+    zone->start = start;
+    zone->end   = end;
+    zone->size  = end - start + 1;
+
+    return KERNAUX_TRUE;
 }
 
 kernaux_bool KernAux_PFA_initialize_finish(
@@ -37,4 +68,8 @@ kernaux_bool KernAux_PFA_initialize_finish(
     if (pfa->initialized) {
         return KERNAUX_FALSE;
     }
+
+    pfa->initialized = KERNAUX_TRUE;
+
+    return KERNAUX_TRUE;
 }