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 radix_to_bin.c
   Convert data from a specific radix to binary.
   Steffen Jaeckel
*/

/**
   Convert data from a specific radix to binary

      The default MPI descriptors #ltm_desc, #tfm_desc and #gmp_desc
      have the following restrictions on parameters:

        \p in    - NUL-terminated char buffer

        \p radix - 2..64

   @param in    The input
   @param radix The radix of the input
   @param out   The output buffer
   @param len   [in/out] The length of the output buffer

   @return CRYPT_OK on success.
*/
int radix_to_bin(const void *in, int radix, void *out, unsigned long *len)
{
   unsigned long l;
   void* mpi;
   int err;

   LTC_ARGCHK(in  != NULL);
   LTC_ARGCHK(len != NULL);

   if ((err = mp_init(&mpi)) != CRYPT_OK) return err;
   if ((err = mp_read_radix(mpi, in, radix)) != CRYPT_OK) goto LBL_ERR;

   if ((l = mp_unsigned_bin_size(mpi)) > *len) {
      *len = l;
      err = CRYPT_BUFFER_OVERFLOW;
      goto LBL_ERR;
   }
   *len = l;

   if ((err = mp_to_unsigned_bin(mpi, out)) != CRYPT_OK) goto LBL_ERR;

LBL_ERR:
   mp_clear(mpi);
   return err;
}

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