[02/11] elf: Introduce enum opt_format in the ldconfig implementation

---
 elf/cache.c                | 24 ++++++++++++------------
 elf/ldconfig.c             |  9 ++++-----
 sysdeps/generic/ldconfig.h |  9 ++++++++-
 3 files changed, 24 insertions(+), 18 deletions(-)

LGTM, thanks.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

On 09/11/2020 15:40, Florian Weimer via Libc-alpha wrote:
> ---
>  elf/cache.c                | 24 ++++++++++++------------
>  elf/ldconfig.c             |  9 ++++-----
>  sysdeps/generic/ldconfig.h |  9 ++++++++-
>  3 files changed, 24 insertions(+), 18 deletions(-)
> 
> diff --git a/elf/cache.c b/elf/cache.c
> index 1eb1455883..c241c17ef9 100644
> --- a/elf/cache.c
> +++ b/elf/cache.c
> @@ -321,13 +321,13 @@ save_cache (const char *cache_name)
>    struct cache_file *file_entries = NULL;
>    size_t file_entries_size = 0;
>  
> -  if (opt_format != 2)
> +  if (opt_format != opt_format_new)
>      {
>        /* struct cache_file_new is 64-bit aligned on some arches while
>  	 only 32-bit aligned on other arches.  Duplicate last old
>  	 cache entry so that new cache in ld.so.cache can be used by
>  	 both.  */
> -      if (opt_format != 0)
> +      if (opt_format != opt_format_old)
>  	cache_entry_old_count = (cache_entry_old_count + 1) & ~1;
>  
>        /* And the list of all entries in the old format.  */
> @@ -345,7 +345,7 @@ save_cache (const char *cache_name)
>    struct cache_file_new *file_entries_new = NULL;
>    size_t file_entries_new_size = 0;
>  
> -  if (opt_format != 0)
> +  if (opt_format != opt_format_old)
>      {
>        /* And the list of all entries in the new format.  */
>        file_entries_new_size = sizeof (struct cache_file_new)
> @@ -370,7 +370,7 @@ save_cache (const char *cache_name)
>       table, we have to adjust all string indices for this so that
>       old libc5/glibc 2 dynamic linkers just ignore them.  */
>    unsigned int str_offset;
> -  if (opt_format != 0)
> +  if (opt_format != opt_format_old)
>      str_offset = file_entries_new_size;
>    else
>      str_offset = 0;
> @@ -385,13 +385,13 @@ save_cache (const char *cache_name)
>         entry = entry->next, ++idx_new)
>      {
>        /* First the library.  */
> -      if (opt_format != 2 && entry->hwcap == 0)
> +      if (opt_format != opt_format_new && entry->hwcap == 0)
>  	{
>  	  file_entries->libs[idx_old].flags = entry->flags;
>  	  /* XXX: Actually we can optimize here and remove duplicates.  */
>  	  file_entries->libs[idx_old].key = str_offset + pad;
>  	}
> -      if (opt_format != 0)
> +      if (opt_format != opt_format_old)
>  	{
>  	  /* We could subtract file_entries_new_size from str_offset -
>  	     not doing so makes the code easier, the string table
> @@ -407,9 +407,9 @@ save_cache (const char *cache_name)
>        str = mempcpy (str, entry->lib, len);
>        str_offset += len;
>        /* Then the path.  */
> -      if (opt_format != 2 && entry->hwcap == 0)
> +      if (opt_format != opt_format_new && entry->hwcap == 0)
>  	file_entries->libs[idx_old].value = str_offset + pad;
> -      if (opt_format != 0)
> +      if (opt_format != opt_format_old)
>  	file_entries_new->libs[idx_new].value = str_offset;
>        len = strlen (entry->path) + 1;
>        str = mempcpy (str, entry->path, len);
> @@ -420,7 +420,7 @@ save_cache (const char *cache_name)
>      }
>  
>    /* Duplicate last old cache entry if needed.  */
> -  if (opt_format != 2
> +  if (opt_format != opt_format_new
>        && idx_old < cache_entry_old_count)
>      file_entries->libs[idx_old] = file_entries->libs[idx_old - 1];
>  
> @@ -438,16 +438,16 @@ save_cache (const char *cache_name)
>  	   temp_name);
>  
>    /* Write contents.  */
> -  if (opt_format != 2)
> +  if (opt_format != opt_format_new)
>      {
>        if (write (fd, file_entries, file_entries_size)
>  	  != (ssize_t) file_entries_size)
>  	error (EXIT_FAILURE, errno, _("Writing of cache data failed"));
>      }
> -  if (opt_format != 0)
> +  if (opt_format != opt_format_old)
>      {
>        /* Align cache.  */
> -      if (opt_format != 2)
> +      if (opt_format != opt_format_new)
>  	{
>  	  char zero[pad];
>  	  memset (zero, '\0', pad);
> diff --git a/elf/ldconfig.c b/elf/ldconfig.c
> index 3768267bac..006198fe59 100644
> --- a/elf/ldconfig.c
> +++ b/elf/ldconfig.c
> @@ -100,8 +100,7 @@ static int opt_print_cache;
>  int opt_verbose;
>  
>  /* Format to support.  */
> -/* 0: only libc5/glibc2; 1: both; 2: only glibc 2.2.  */
> -int opt_format = 2;
> +enum opt_format opt_format = opt_format_new;
>  
>  /* Build cache.  */
>  static int opt_build_cache = 1;
> @@ -281,11 +280,11 @@ parse_opt (int key, char *arg, struct argp_state *state)
>        break;
>      case 'c':
>        if (strcmp (arg, "old") == 0)
> -	opt_format = 0;
> +	opt_format = opt_format_old;
>        else if (strcmp (arg, "compat") == 0)
> -	opt_format = 1;
> +	opt_format = opt_format_compat;
>        else if (strcmp (arg, "new") == 0)
> -	opt_format = 2;
> +	opt_format = opt_format_new;
>        break;
>      default:
>        return ARGP_ERR_UNKNOWN;
> diff --git a/sysdeps/generic/ldconfig.h b/sysdeps/generic/ldconfig.h
> index b64aab0064..cfec9d4668 100644
> --- a/sysdeps/generic/ldconfig.h
> +++ b/sysdeps/generic/ldconfig.h
> @@ -90,7 +90,14 @@ extern char *chroot_canon (const char *chroot, const char *name);
>  /* Declared in ldconfig.c.  */
>  extern int opt_verbose;
>  
> -extern int opt_format;
> +enum opt_format
> +  {
> +    opt_format_old = 0,	/* Use struct cache_file.  */
> +    opt_format_compat = 1, /* Use both, old format followed by new.  */
> +    opt_format_new = 2,	/* Use struct cache_file_new.  */
> +  };
> +
> +extern enum opt_format opt_format;
>  
>  /* Prototypes for a few program-wide used functions.  */
>  #include <programs/xmalloc.h>
>