mem: Improve documentation wording and spelling

libavutil/mem.c

@@ -65,7 +65,7 @@ void *av_malloc(size_t size)
     long diff;
 #endif
 
-    /* let's disallow possible ambiguous cases */
+    /* let's disallow possibly ambiguous cases */
     if (size > (INT_MAX - 32) || !size)
         return NULL;
 
@@ -119,7 +119,7 @@ void *av_realloc(void *ptr, size_t size)
     int diff;
 #endif
 
-    /* let's disallow possible ambiguous cases */
+    /* let's disallow possibly ambiguous cases */
     if (size > (INT_MAX - 16))
         return NULL;
 

libavutil/mem.h

@@ -82,8 +82,7 @@
 void *av_malloc(size_t size) av_malloc_attrib av_alloc_size(1);
 
 /**
- * Helper function to allocate a block of size * nmemb bytes with
- * using av_malloc()
+ * Allocate a block of size * nmemb bytes with av_malloc().
  * @param nmemb Number of elements
  * @param size Size of the single element
  * @return Pointer to the allocated block, NULL if the block cannot
@@ -101,14 +100,14 @@ av_alloc_size(1, 2) static inline void *av_malloc_array(size_t nmemb, size_t siz
  * Allocate or reallocate a block of memory.
  * If ptr is NULL and size > 0, allocate a new block. If
  * size is zero, free the memory block pointed to by ptr.
- * @note Pointers provided by av_malloc family of functions cannot be
- * passed to av_realloc().
  * @param ptr Pointer to a memory block already allocated with
  * av_realloc() or NULL.
- * @param size Size in bytes for the memory block to be allocated or
+ * @param size Size in bytes of the memory block to be allocated or
  * reallocated.
- * @return Pointer to a newly reallocated block or NULL if the block
+ * @return Pointer to a newly-reallocated block or NULL if the block
  * cannot be reallocated or the function is used to free the memory block.
+ * @note av_realloc() is not guaranteed to maintain the alignment of
+ *       pointers originating from the av_malloc() family of functions.
  * @see av_fast_realloc()
  */
 void *av_realloc(void *ptr, size_t size) av_alloc_size(2);
@@ -117,29 +116,29 @@ void *av_realloc(void *ptr, size_t size) av_alloc_size(2);
  * Allocate or reallocate an array.
  * If ptr is NULL and nmemb > 0, allocate a new block. If
  * nmemb is zero, free the memory block pointed to by ptr.
- * @note Pointers provided by av_malloc family of functions cannot be
- * passed to av_realloc_array().
  * @param ptr Pointer to a memory block already allocated with
  * av_realloc() or NULL.
  * @param nmemb Number of elements
  * @param size Size of the single element
- * @return Pointer to a newly reallocated block or NULL if the block
+ * @return Pointer to a newly-reallocated block or NULL if the block
  * cannot be reallocated or the function is used to free the memory block.
+ * @note av_realloc_array() is not guaranteed to maintain the alignment of
+ *       pointers originating from the av_malloc() family of functions.
  */
 av_alloc_size(2, 3) void *av_realloc_array(void *ptr, size_t nmemb, size_t size);
 
 /**
- * Allocate or reallocate an array.
+ * Allocate or reallocate an array through a pointer to a pointer.
  * If *ptr is NULL and nmemb > 0, allocate a new block. If
  * nmemb is zero, free the memory block pointed to by ptr.
- * @note Pointers provided by av_malloc family of functions cannot be
- * passed to av_reallocp_array().
  * @param ptr Pointer to a pointer to a memory block already allocated
  * with av_realloc(), or pointer to a pointer to NULL.
  * The pointer is updated on success, or freed on failure.
  * @param nmemb Number of elements
  * @param size Size of the single element
  * @return Zero on success, an AVERROR error code on failure.
+ * @note av_reallocp_array() is not guaranteed to maintain the alignment of
+ *       pointers originating from the av_malloc() family of functions.
  */
 av_alloc_size(2, 3) int av_reallocp_array(void *ptr, size_t nmemb, size_t size);
 
@@ -164,8 +163,7 @@ void av_free(void *ptr);
 void *av_mallocz(size_t size) av_malloc_attrib av_alloc_size(1);
 
 /**
- * Helper function to allocate a block of size * nmemb bytes with
- * using av_mallocz()
+ * Allocate a block of size * nmemb bytes with av_mallocz().
  * @param nmemb Number of elements
  * @param size Size of the single element
  * @return Pointer to the allocated block, NULL if the block cannot
@@ -183,7 +181,7 @@ av_alloc_size(1, 2) static inline void *av_mallocz_array(size_t nmemb, size_t si
 /**
  * Duplicate the string s.
  * @param s string to be duplicated
- * @return Pointer to a newly allocated string containing a
+ * @return Pointer to a newly-allocated string containing a
  * copy of s or NULL if the string cannot be allocated.
  */
 char *av_strdup(const char *s) av_malloc_attrib;
@@ -198,7 +196,7 @@ char *av_strdup(const char *s) av_malloc_attrib;
 void av_freep(void *ptr);
 
 /**
- * @brief deliberately overlapping memcpy implementation
+ * deliberately overlapping memcpy implementation
  * @param dst destination buffer
  * @param back how many bytes back we start (the initial size of the overlapping window)
  * @param cnt number of bytes to copy, must be >= 0