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Replace size_t by unsigned long for output sizes.

https://sourceforge.net/p/mingw-w64/wiki2/gnu%20printf/

--- a/b2sum/b2sum.c

+++ b/b2sum/b2sum.c

@@ -251,9 +251,9 @@

 int main( int argc, char **argv )

 {

   blake2fn blake2_stream = blake2b_stream;

-  size_t maxbytes = BLAKE2B_OUTBYTES;

+  unsigned long maxbytes = BLAKE2B_OUTBYTES;

   const char *algorithm = "BLAKE2b";

-  size_t outbytes = 0;

+  unsigned long outbytes = 0;

   unsigned char hash[BLAKE2B_OUTBYTES] = {0};

   bool bsdstyle = false;

   int c;

@@ -264,7 +264,7 @@

     int this_option_optind = optind ? optind : 1;

     int option_index = 0;

     char *end = NULL;

-    size_t outbits;

+    unsigned long outbits;

     static struct option long_options[] = {

       { "help",  no_argument, 0,  0  },

       { "tag",   no_argument, 0,  0  },

@@ -310,7 +310,7 @@

     case 'l':

       outbits = strtoul(optarg, &end, 10);

-      if( !end || *end != '\0' || outbits % 8 )

+      if( !end || *end != '\0' || outbits % 8 != 0)

       {

         printf( "Invalid length argument: `%s'\n", optarg);

         usage( argv, 111 );

@@ -333,8 +333,8 @@

   if(outbytes > maxbytes)

   {

-    printf( "Invalid length argument: %zu\n", outbytes * 8 );

-    printf( "Maximum digest length for %s is %zu\n", algorithm, maxbytes * 8 );

+    printf( "Invalid length argument: %lu\n", outbytes * 8 );

+    printf( "Maximum digest length for %s is %lu\n", algorithm, maxbytes * 8 );

     usage( argv, 111 );

   }

   else if( outbytes == 0 )

@@ -366,7 +366,7 @@

       if( bsdstyle )

       {

         if( outbytes < maxbytes )

-          printf( "%s-%zu (%s) = ", algorithm, outbytes * 8, argv[i] );

+          printf( "%s-%lu (%s) = ", algorithm, outbytes * 8, argv[i] );

         else

           printf( "%s (%s) = ", algorithm, argv[i] );

       }

-- 

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