[PATCH v2 0/3] Extend and add a little more generalization to the mem_pool API

In my new merge algorithm, I made use of the mem_pool API in a few places...but I also needed to add a few more functions and also needed to make the API a bit more general.

Changes since v1:

 * Made the error message tweaks suggested by Eric
 * Although mem_pool_init() intialized all members manually, add a memset()
   to 0 for future-proofing, as suggested by Junio.
 * Use 'pool' instead of 'mem_pool' in patch 2 so that patch 3 doesn't have
   to change as much (as suggested by Junio).

Also, Matheus said he'd rebase his parallel-checkout RFC series (next yet in next or seen) on top of mine to avoid the semantic conflict.

Elijah Newren (3):
  mem-pool: add convenience functions for xstrdup and xstrndup
  mem-pool: use more standard initialization and finalization
  mem-pool: use consistent pool variable name

 fast-import.c | 12 ++-------
 mem-pool.c    | 74 ++++++++++++++++++++++++++++++++-------------------
 mem-pool.h    | 14 +++++++---
 read-cache.c  | 21 +++++++++------
 split-index.c |  6 +++--
 5 files changed, 75 insertions(+), 52 deletions(-)

base-commit: 7814e8a05a59c0cf5fb186661d1551c75d1299b5
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-git-830%2Fnewren%2Fmem_pool_api-v2
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-git-830/newren/mem_pool_api-v2
Pull-Request: https://github.com/git/git/pull/830

Range-diff vs v1:

 1:  eae8b2923f ! 1:  6d679c5b46 mem-pool: add convenience functions for xstrdup and xstrndup
     @@ mem-pool.c: void *mem_pool_calloc(struct mem_pool *mem_pool, size_t count, size_
      +	char *ret = mem_pool_alloc(pool, len);
      +
      +	if (!ret)
     -+		die("Out of memory, mem_pool_xstrdup failed");
     ++		die(_("mem_pool_xstrdup: out of memory"));
      +
      +	return memcpy(ret, str, len);
      +}
     @@ mem-pool.c: void *mem_pool_calloc(struct mem_pool *mem_pool, size_t count, size_
      +	char *ret = mem_pool_alloc(pool, minlen+1);
      +
      +	if (!ret)
     -+		die("Out of memory, mem_pool_xstrndup failed");
     ++		die(_("mem_pool_xstrndup: out of memory"));
      +
      +	ret[minlen] = '\0';
      +	return memcpy(ret, str, minlen);
 2:  f13a52055c ! 2:  e04ba96b22 mem-pool: use more standard initialization and finalization
     @@ mem-pool.c: static struct mp_block *mem_pool_alloc_block(struct mem_pool *mem_po
       }
       
      -void mem_pool_init(struct mem_pool **mem_pool, size_t initial_size)
     -+void mem_pool_init(struct mem_pool *mem_pool, size_t initial_size)
     ++void mem_pool_init(struct mem_pool *pool, size_t initial_size)
       {
      -	struct mem_pool *pool;
      -
     @@ mem-pool.c: static struct mp_block *mem_pool_alloc_block(struct mem_pool *mem_po
      -
      -	pool = xcalloc(1, sizeof(*pool));
      -
     --	pool->block_alloc = BLOCK_GROWTH_SIZE;
     -+	mem_pool->mp_block = NULL;
     -+	mem_pool->pool_alloc = 0;
     -+	mem_pool->block_alloc = BLOCK_GROWTH_SIZE;
     ++	memset(pool, 0, sizeof(*pool));
     + 	pool->block_alloc = BLOCK_GROWTH_SIZE;
       
       	if (initial_size > 0)
     --		mem_pool_alloc_block(pool, initial_size, NULL);
     + 		mem_pool_alloc_block(pool, initial_size, NULL);
      -
      -	*mem_pool = pool;
     -+		mem_pool_alloc_block(mem_pool, initial_size, NULL);
       }
       
       void mem_pool_discard(struct mem_pool *mem_pool, int invalidate_memory)
     @@ mem-pool.h: struct mem_pool {
        * Initialize mem_pool with specified initial size.
        */
      -void mem_pool_init(struct mem_pool **mem_pool, size_t initial_size);
     -+void mem_pool_init(struct mem_pool *mem_pool, size_t initial_size);
     ++void mem_pool_init(struct mem_pool *pool, size_t initial_size);
       
       /*
      - * Discard a memory pool and free all the memory it is responsible for.
 3:  62c2479fe6 ! 3:  616402c64e mem-pool: use consistent pool variable name
     @@ mem-pool.c: static struct mp_block *mem_pool_alloc_block(struct mem_pool *mem_po
       	}
       
       	return p;
     - }
     - 
     --void mem_pool_init(struct mem_pool *mem_pool, size_t initial_size)
     -+void mem_pool_init(struct mem_pool *pool, size_t initial_size)
     - {
     --	mem_pool->mp_block = NULL;
     --	mem_pool->pool_alloc = 0;
     --	mem_pool->block_alloc = BLOCK_GROWTH_SIZE;
     -+	pool->mp_block = NULL;
     -+	pool->pool_alloc = 0;
     -+	pool->block_alloc = BLOCK_GROWTH_SIZE;
     - 
     - 	if (initial_size > 0)
     --		mem_pool_alloc_block(mem_pool, initial_size, NULL);
     -+		mem_pool_alloc_block(pool, initial_size, NULL);
     +@@ mem-pool.c: void mem_pool_init(struct mem_pool *pool, size_t initial_size)
     + 		mem_pool_alloc_block(pool, initial_size, NULL);
       }
       
      -void mem_pool_discard(struct mem_pool *mem_pool, int invalidate_memory)
     @@ mem-pool.c: char *mem_pool_xstrndup(struct mem_pool *pool, const char *str, size
       			return 1;
      
       ## mem-pool.h ##
     -@@ mem-pool.h: struct mem_pool {
     - /*
     -  * Initialize mem_pool with specified initial size.
     -  */
     --void mem_pool_init(struct mem_pool *mem_pool, size_t initial_size);
     -+void mem_pool_init(struct mem_pool *pool, size_t initial_size);
     - 
     +@@ mem-pool.h: void mem_pool_init(struct mem_pool *pool, size_t initial_size);
       /*
        * Discard all the memory the memory pool is responsible for.
        */