From d7fba566b1a91340ffd19974ea79f463e429ad35 Mon Sep 17 00:00:00 2001
From: Ben Pfaff <blp@nicira.com>
Date: Tue, 16 Dec 2008 16:19:36 -0800
Subject: [PATCH] Introduce x2nrealloc() helper function, and use it.

Also fixes a bug in read_cert_file() in vconn-ssl.c: "sizeof *certs"
should have been "sizeof **certs".  In fact the sizes will be identical
in all practical cases since both *certs and **certs are pointer types,
so this is not an important fix.
---
 lib/fatal-signal.c | 3 +--
 lib/util.c         | 7 +++++++
 lib/util.h         | 1 +
 lib/vconn-ssl.c    | 3 +--
 secchan/secchan.c  | 6 ++----
 secchan/status.c   | 8 +++-----
 6 files changed, 15 insertions(+), 13 deletions(-)

diff --git a/lib/fatal-signal.c b/lib/fatal-signal.c
index ac9e2a59..e4bc4577 100644
--- a/lib/fatal-signal.c
+++ b/lib/fatal-signal.c
@@ -201,8 +201,7 @@ fatal_signal_add_file_to_unlink(const char *file)
 
     fatal_signal_block();
     if (n_files >= max_files) {
-        max_files = max_files * 2 + 1;
-        files = xrealloc(files, sizeof *files * max_files);
+        files = x2nrealloc(files, &max_files, sizeof *files);
     }
     files[n_files++] = xstrdup(file);
     fatal_signal_unblock();
diff --git a/lib/util.c b/lib/util.c
index 72138a06..abf005d3 100644
--- a/lib/util.c
+++ b/lib/util.c
@@ -118,6 +118,13 @@ xvasprintf(const char *format, va_list args)
     return s;
 }
 
+void *
+x2nrealloc(void *p, size_t *n, size_t s)
+{
+    *n = *n == 0 ? 1 : 2 * *n;
+    return xrealloc(p, *n * s);
+}
+
 char *
 xasprintf(const char *format, ...)
 {
diff --git a/lib/util.h b/lib/util.h
index 8dee9b6d..8172b69e 100644
--- a/lib/util.h
+++ b/lib/util.h
@@ -102,6 +102,7 @@ char *xmemdup0(const char *, size_t);
 char *xstrdup(const char *);
 char *xasprintf(const char *format, ...) PRINTF_FORMAT(1, 2);
 char *xvasprintf(const char *format, va_list) PRINTF_FORMAT(1, 0);
+void *x2nrealloc(void *p, size_t *n, size_t s);
 
 #ifndef HAVE_STRLCPY
 void strlcpy(char *dst, const char *src, size_t size);
diff --git a/lib/vconn-ssl.c b/lib/vconn-ssl.c
index 383714af..6d24e277 100644
--- a/lib/vconn-ssl.c
+++ b/lib/vconn-ssl.c
@@ -1087,8 +1087,7 @@ read_cert_file(const char *file_name, X509 ***certs, size_t *n_certs)
 
         /* Add certificate to array. */
         if (*n_certs >= allocated_certs) {
-            allocated_certs = 1 + 2 * allocated_certs;
-            *certs = xrealloc(*certs, sizeof *certs * allocated_certs);
+            *certs = x2nrealloc(*certs, &allocated_certs, sizeof **certs);
         }
         (*certs)[(*n_certs)++] = certificate;
 
diff --git a/secchan/secchan.c b/secchan/secchan.c
index fa8d6e85..e2712cd1 100644
--- a/secchan/secchan.c
+++ b/secchan/secchan.c
@@ -313,10 +313,8 @@ add_hook(struct secchan *secchan, const struct hook_class *class, void *aux)
     struct hook *hook;
 
     if (secchan->n_hooks >= secchan->allocated_hooks) {
-        secchan->allocated_hooks = secchan->allocated_hooks * 2 + 1;
-        secchan->hooks = xrealloc(secchan->hooks,
-                                  (sizeof *secchan->hooks
-                                   * secchan->allocated_hooks));
+        secchan->hooks = x2nrealloc(secchan->hooks, &secchan->allocated_hooks,
+                                    sizeof *secchan->hooks);
     }
     hook = &secchan->hooks[secchan->n_hooks++];
     hook->class = class;
diff --git a/secchan/status.c b/secchan/status.c
index 8b6224c4..cf228123 100644
--- a/secchan/status.c
+++ b/secchan/status.c
@@ -58,7 +58,7 @@ struct switch_status {
     const struct settings *s;
     time_t booted;
     struct switch_status_category *categories;
-    int n_categories, allocated_categories;
+    size_t n_categories, allocated_categories;
 };
 
 struct status_reply {
@@ -195,10 +195,8 @@ switch_status_register_category(struct switch_status *ss,
 {
     struct switch_status_category *c;
     if (ss->n_categories >= ss->allocated_categories) {
-        ss->allocated_categories = 1 + ss->allocated_categories * 2;
-        ss->categories = xrealloc(ss->categories,
-                                  (sizeof *ss->categories
-                                   * ss->allocated_categories));
+        ss->categories = x2nrealloc(ss->categories, &ss->allocated_categories,
+                                    sizeof *ss->categories);
     }
     c = &ss->categories[ss->n_categories++];
     c->cb = cb;
-- 
2.30.2