[PATCH] constify static arrays of strings

[Mike Frysinger]

ping ...
-mike

On 30 Sep 2021 13:44, Mike Frysinger wrote:
> By marking these static & the array itself as const, the data is moved
> into the read-only section of memory.  Otherwise a writable array is
> created which takes up more space or code execution time.  So this will
> both shrink & slightly speed up the code for free.
> ---
>  auth-rhosts.c                         | 2 +-
>  dns.c                                 | 2 +-
>  kex.c                                 | 2 +-
>  nchan.c                               | 8 ++++++--
>  regress/misc/fuzz-harness/kex_fuzz.cc | 2 +-
>  sftp-server.c                         | 2 +-
>  ssh-keygen.c                          | 2 +-
>  sshconnect2.c                         | 2 +-
>  utf8.c                                | 4 +++-
>  9 files changed, 16 insertions(+), 10 deletions(-)
> 
> diff --git a/auth-rhosts.c b/auth-rhosts.c
> index 0bc4d424c781..7022d6a6f0f5 100644
> --- a/auth-rhosts.c
> +++ b/auth-rhosts.c
> @@ -191,7 +191,7 @@ auth_rhosts2(struct passwd *pw, const char *client_user, const char *hostname,
>  {
>  	char buf[1024];
>  	struct stat st;
> -	static const char *rhosts_files[] = {".shosts", ".rhosts", NULL};
> +	static const char * const rhosts_files[] = {".shosts", ".rhosts", NULL};
>  	u_int rhosts_file_index;
>  
>  	debug2("auth_rhosts2: clientuser %s hostname %s ipaddr %s",
> diff --git a/dns.c b/dns.c
> index 1cfc38e7cc43..286b4021960a 100644
> --- a/dns.c
> +++ b/dns.c
> @@ -43,7 +43,7 @@
>  #include "log.h"
>  #include "digest.h"
>  
> -static const char *errset_text[] = {
> +static const char * const errset_text[] = {
>  	"success",		/* 0 ERRSET_SUCCESS */
>  	"out of memory",	/* 1 ERRSET_NOMEMORY */
>  	"general failure",	/* 2 ERRSET_FAIL */
> diff --git a/kex.c b/kex.c
> index 709a0ec63aa0..195819f1d953 100644
> --- a/kex.c
> +++ b/kex.c
> @@ -66,7 +66,7 @@
>  static int kex_choose_conf(struct ssh *);
>  static int kex_input_newkeys(int, u_int32_t, struct ssh *);
>  
> -static const char *proposal_names[PROPOSAL_MAX] = {
> +static const char * const proposal_names[PROPOSAL_MAX] = {
>  	"KEX algorithms",
>  	"host key algorithms",
>  	"ciphers ctos",
> diff --git a/nchan.c b/nchan.c
> index 7ef3a350b79a..72a1a8358aa2 100644
> --- a/nchan.c
> +++ b/nchan.c
> @@ -82,8 +82,12 @@ static void	chan_shutdown_write(struct ssh *, Channel *);
>  static void	chan_shutdown_read(struct ssh *, Channel *);
>  static void	chan_shutdown_extended_read(struct ssh *, Channel *);
>  
> -static const char *ostates[] = { "open", "drain", "wait_ieof", "closed" };
> -static const char *istates[] = { "open", "drain", "wait_oclose", "closed" };
> +static const char * const ostates[] = {
> +	"open", "drain", "wait_ieof", "closed",
> +};
> +static const char * const istates[] = {
> +	"open", "drain", "wait_oclose", "closed",
> +};
>  
>  static void
>  chan_set_istate(Channel *c, u_int next)
> diff --git a/regress/misc/fuzz-harness/kex_fuzz.cc b/regress/misc/fuzz-harness/kex_fuzz.cc
> index 4740a7cb04c1..d1198fa6bc66 100644
> --- a/regress/misc/fuzz-harness/kex_fuzz.cc
> +++ b/regress/misc/fuzz-harness/kex_fuzz.cc
> @@ -327,7 +327,7 @@ int main(void)
>  	static struct shared_state *st;
>  	struct test_state *ts;
>  	const int keytypes[] = { KEY_RSA, KEY_DSA, KEY_ECDSA, KEY_ED25519, -1 };
> -	const char *kextypes[] = {
> +	static const char * const kextypes[] = {
>  		"sntrup761x25519-sha512 at openssh.com",
>  		"curve25519-sha256 at libssh.org",
>  		"ecdh-sha2-nistp256",
> diff --git a/sftp-server.c b/sftp-server.c
> index 18d194911257..efef57cadb0d 100644
> --- a/sftp-server.c
> +++ b/sftp-server.c
> @@ -517,7 +517,7 @@ send_msg(struct sshbuf *m)
>  static const char *
>  status_to_message(u_int32_t status)
>  {
> -	const char *status_messages[] = {
> +	static const char * const status_messages[] = {
>  		"Success",			/* SSH_FX_OK */
>  		"End of file",			/* SSH_FX_EOF */
>  		"No such file",			/* SSH_FX_NO_SUCH_FILE */
> diff --git a/ssh-keygen.c b/ssh-keygen.c
> index 4b40768d517f..76c6c726c17f 100644
> --- a/ssh-keygen.c
> +++ b/ssh-keygen.c
> @@ -2459,7 +2459,7 @@ load_sign_key(const char *keypath, const struct sshkey *pubkey)
>  {
>  	size_t i, slen, plen = strlen(keypath);
>  	char *privpath = xstrdup(keypath);
> -	const char *suffixes[] = { "-cert.pub", ".pub", NULL };
> +	static const char * const suffixes[] = { "-cert.pub", ".pub", NULL };
>  	struct sshkey *ret = NULL, *privkey = NULL;
>  	int r;
>  
> diff --git a/sshconnect2.c b/sshconnect2.c
> index fea50fab61d3..808ff8d38e91 100644
> --- a/sshconnect2.c
> +++ b/sshconnect2.c
> @@ -1318,7 +1318,7 @@ identity_sign(struct identity *id, u_char **sigp, size_t *lenp,
>  static int
>  id_filename_matches(Identity *id, Identity *private_id)
>  {
> -	const char *suffixes[] = { ".pub", "-cert.pub", NULL };
> +	static const char * const suffixes[] = { ".pub", "-cert.pub", NULL };
>  	size_t len = strlen(id->filename), plen = strlen(private_id->filename);
>  	size_t i, slen;
>  
> diff --git a/utf8.c b/utf8.c
> index 7f63b25aeefc..5cafe21e611f 100644
> --- a/utf8.c
> +++ b/utf8.c
> @@ -325,7 +325,9 @@ mprintf(const char *fmt, ...)
>  void
>  msetlocale(void)
>  {
> -	const char *vars[] = { "LC_ALL", "LC_CTYPE", "LANG", NULL };
> +	static const char * const vars[] = {
> +		"LC_ALL", "LC_CTYPE", "LANG", NULL,
> +	};
>  	char *cp;
>  	int i;
>  
> -- 
> 2.33.0
> 
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