* * * * *
99 ways to program a hex, Part 12: C99, const and restrict correctness,
assertive, GCC extenstions
And today's code is identical to part 10 [1] save again for one line—it too
uses a GCC extension [2] per yesterday's code [3].
This also marks the end of the C versions for a couple of days.
> /*************************************************************************
> *
> * Copyright 2012 by Sean Conner. All Rights Reserved.
> *
> * This program is free software; you can redistribute it and/or
> * modify it under the terms of the GNU General Public License
> * as published by the Free Software Foundation; either version 2
> * of the License, or (at your option) any later version.
> *
> * This program is distributed in the hope that it will be useful,
> * but WITHOUT ANY WARRANTY; without even the implied warranty of
> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> * GNU General Public License for more details.
> *
> * You should have received a copy of the GNU General Public License
> * along with this program; if not, write to the Free Software
> * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
> *
> * Comments, questions and criticisms can be sent to:
[email protected]
> *
> *************************************************************************/
>
> /* Style: C99, const and restrict correctness, assertive, GCC extenstions */
>
> #include <stdio.h>
> #include <ctype.h>
> #include <string.h>
> #include <stdlib.h>
> #include <assert.h>
>
> #define LINESIZE 16
>
> static void do_dump (FILE *const restrict,FILE *const restrict) __attribute__((nonnull,nothrow));
>
> /****************************************************************/
>
> int main(const int argc,char *const restrict argv[])
> {
> assert(argc >= 1);
> assert(argv != NULL);
> assert(argv[0] != NULL);
>
> if (argc == 1)
> do_dump(stdin,stdout);
> else
> {
> for (int i = 1 ; i < argc ; i++)
> {
> FILE *fp = fopen(argv[i],"rb");
> if (fp == NULL)
> {
> perror(argv[i]);
> continue;
> }
>
> printf("-----%s-----\n",argv[i]);
> do_dump(fp,stdout);
> fclose(fp);
> }
> }
>
> return EXIT_SUCCESS;
> }
>
> /******************************************************************/
>
> static void do_dump(FILE *const restrict fpin,FILE *const restrict fpout)
> {
> unsigned char buffer[BUFSIZ];
> size_t offset;
> size_t bread;
>
> assert(fpin != NULL);
> assert(fpout != NULL);
>
> offset = 0;
>
> while((bread = fread(buffer,1,BUFSIZ,fpin)) > 0)
> {
> unsigned char *pbyte = buffer;
>
> while (bread > 0)
> {
> char ascii[LINESIZE + 1];
>
> fprintf(fpout,"%08lX: ",(unsigned long)offset);
> size_t j = 0;
>
> do
> {
> fprintf(fpout,"%02X ",*pbyte);
> if (isprint(*pbyte))
> ascii [j] = *pbyte;
> else
> ascii [j] = '.';
> pbyte ++;
> offset ++;
> j ++;
> bread --;
> } while ((j < LINESIZE) && (bread > 0));
>
> ascii [j] = '\0';
>
> if (j < LINESIZE)
> for (size_t i = j ; i < LINESIZE ; i++) fprintf(fpout," ");
>
> fprintf(fpout,"%s\n",ascii);
> }
>
> if (fflush(fpout) == EOF)
> {
> perror("output");
> exit(EXIT_FAILURE);
> }
> }
> }
>
> /***************************************************************/
>
* Part 11: C89, const correctness, assertive, GCC extensions [4]
* Part 13: COLOR COMPUTER BASIC, EASY [5]
[1]
gopher://gopher.conman.org/0Phlog:2012/01/18.1
[2]
http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html
[3]
gopher://gopher.conman.org/0Phlog:2012/01/19.2
[4]
gopher://gopher.conman.org/0Phlog:2012/01/19.2
[5]
gopher://gopher.conman.org/0Phlog:2012/01/21.1
Email author at
[email protected]
