fix some gcc warnings (#73) * tweak string size fix gcc8 warnings ``` svr-agentfwd.c: In function 'bindagent': svr-agentfwd.c:254:53: warning: '%s' directive output may be truncated writing up to 107 bytes into a region of size between 0 and 107 [-Wformat-truncation=] snprintf(addr.sun_path, sizeof(addr.sun_path), "%s/%s", path, sockfile); ^~ ~~~~~~~~ svr-agentfwd.c:254:2: note: 'snprintf' output between 2 and 216 bytes into a destination of size 108 snprintf(addr.sun_path, sizeof(addr.sun_path), "%s/%s", path, sockfile); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ``` * cleanup signed/unsigned comparison fix gcc8 warnings ``` scp.c: In function 'do_local_cmd': scp.c:132:17: warning: comparison of integer expressions of different signedness: 'u_int' {aka 'unsigned int'} and 'int' [-Wsign-compare] for (i = 0; i < a->num; i++) ^ scpmisc.c: In function 'addargs': scpmisc.c:161:25: warning: comparison of integer expressions of different signedness: 'int' and 'u_int' {aka 'unsigned int'} [-Wsign-compare] } else if (args->num+2 >= nalloc) ^~ scpmisc.c: In function 'replacearg': scpmisc.c:183:12: warning: comparison of integer expressions of different signedness: 'u_int' {aka 'unsigned int'} and 'int' [-Wsign-compare] if (which >= args->num) ^~ scpmisc.c: In function 'freeargs': scpmisc.c:196:17: warning: comparison of integer expressions of different signedness: 'u_int' {aka 'unsigned int'} and 'int' [-Wsign-compare] for (i = 0; i < args->num; i++) ^ ``` see https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/misc.h.diff?r1=1.16&r2=1.17

/* LibTomCrypt, modular cryptographic library -- Tom St Denis
 *
 * LibTomCrypt is a library that provides various cryptographic
 * algorithms in a highly modular and flexible manner.
 *
 * The library is free for all purposes without any express
 * guarantee it works.
 */
#include "tomcrypt.h"

/**
  @file f9_init.c
  F9 Support, start an F9 state
*/

#ifdef LTC_F9_MODE

/** Initialize F9-MAC state
  @param f9    [out] f9 state to initialize
  @param cipher  Index of cipher to use
  @param key     [in]  Secret key
  @param keylen  Length of secret key in octets
  Return CRYPT_OK on success
*/
int f9_init(f9_state *f9, int cipher, const unsigned char *key, unsigned long keylen)
{
   int            x, err;

   LTC_ARGCHK(f9   != NULL);
   LTC_ARGCHK(key  != NULL);

   /* schedule the key */
   if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
      return err;
   }

#ifdef LTC_FAST
   if (cipher_descriptor[cipher].block_length % sizeof(LTC_FAST_TYPE)) {
       return CRYPT_INVALID_ARG;
   }
#endif

   if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, &f9->key)) != CRYPT_OK) {
      goto done;
   }

   /* make the second key */
   for (x = 0; (unsigned)x < keylen; x++) {
      f9->akey[x] = key[x] ^ 0xAA;
   }

   /* setup struct */
   zeromem(f9->IV,  cipher_descriptor[cipher].block_length);
   zeromem(f9->ACC, cipher_descriptor[cipher].block_length);
   f9->blocksize = cipher_descriptor[cipher].block_length;
   f9->cipher    = cipher;
   f9->buflen    = 0;
   f9->keylen    = keylen;
done:
   return err;
}

#endif

/* ref:         $Format:%D$ */
/* git commit:  $Format:%H$ */
/* commit time: $Format:%ai$ */