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"

#ifdef LTC_MPI
#include <stdarg.h>

int ltc_init_multi(void **a, ...)
{
   void    **cur = a;
   int       np  = 0;
   va_list   args;

   va_start(args, a);
   while (cur != NULL) {
       if (mp_init(cur) != CRYPT_OK) {
          /* failed */
          va_list clean_list;

          va_start(clean_list, a);
          cur = a;
          while (np--) {
              mp_clear(*cur);
              cur = va_arg(clean_list, void**);
          }
          va_end(clean_list);
          va_end(args);
          return CRYPT_MEM;
       }
       ++np;
       cur = va_arg(args, void**);
   }
   va_end(args);
   return CRYPT_OK;
}

void ltc_deinit_multi(void *a, ...)
{
   void     *cur = a;
   va_list   args;

   va_start(args, a);
   while (cur != NULL) {
       mp_clear(cur);
       cur = va_arg(args, void *);
   }
   va_end(args);
}

void ltc_cleanup_multi(void **a, ...)
{
   void **cur = a;
   va_list args;

   va_start(args, a);
   while (cur != NULL) {
      if (*cur != NULL) {
         mp_clear(*cur);
         *cur = NULL;
      }
      cur = va_arg(args, void**);
   }
   va_end(args);
   return;
}

#endif

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