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4
.gitignore
vendored
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4
.gitignore
vendored
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*.swp
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*.o
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plainhex
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plainunhex
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116
CC0
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116
CC0
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CC0 1.0 Universal
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Statement of Purpose
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The laws of most jurisdictions throughout the world automatically confer
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exclusive Copyright and Related Rights (defined below) upon the creator and
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subsequent owner(s) (each and all, an "owner") of an original work of
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authorship and/or a database (each, a "Work").
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Certain owners wish to permanently relinquish those rights to a Work for the
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purpose of contributing to a commons of creative, cultural and scientific
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works ("Commons") that the public can reliably and without fear of later
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claims of infringement build upon, modify, incorporate in other works, reuse
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and redistribute as freely as possible in any form whatsoever and for any
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purposes, including without limitation commercial purposes. These owners may
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contribute to the Commons to promote the ideal of a free culture and the
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further production of creative, cultural and scientific works, or to gain
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reputation or greater distribution for their Work in part through the use and
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efforts of others.
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For these and/or other purposes and motivations, and without any expectation
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of additional consideration or compensation, the person associating CC0 with a
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Work (the "Affirmer"), to the extent that he or she is an owner of Copyright
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and Related Rights in the Work, voluntarily elects to apply CC0 to the Work
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and publicly distribute the Work under its terms, with knowledge of his or her
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Copyright and Related Rights in the Work and the meaning and intended legal
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effect of CC0 on those rights.
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1. Copyright and Related Rights. A Work made available under CC0 may be
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protected by copyright and related or neighboring rights ("Copyright and
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Related Rights"). Copyright and Related Rights include, but are not limited
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to, the following:
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i. the right to reproduce, adapt, distribute, perform, display, communicate,
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and translate a Work;
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ii. moral rights retained by the original author(s) and/or performer(s);
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iii. publicity and privacy rights pertaining to a person's image or likeness
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depicted in a Work;
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iv. rights protecting against unfair competition in regards to a Work,
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subject to the limitations in paragraph 4(a), below;
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v. rights protecting the extraction, dissemination, use and reuse of data in
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a Work;
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vi. database rights (such as those arising under Directive 96/9/EC of the
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European Parliament and of the Council of 11 March 1996 on the legal
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protection of databases, and under any national implementation thereof,
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including any amended or successor version of such directive); and
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vii. other similar, equivalent or corresponding rights throughout the world
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based on applicable law or treaty, and any national implementations thereof.
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2. Waiver. To the greatest extent permitted by, but not in contravention of,
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applicable law, Affirmer hereby overtly, fully, permanently, irrevocably and
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unconditionally waives, abandons, and surrenders all of Affirmer's Copyright
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and Related Rights and associated claims and causes of action, whether now
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known or unknown (including existing as well as future claims and causes of
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action), in the Work (i) in all territories worldwide, (ii) for the maximum
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duration provided by applicable law or treaty (including future time
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extensions), (iii) in any current or future medium and for any number of
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copies, and (iv) for any purpose whatsoever, including without limitation
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commercial, advertising or promotional purposes (the "Waiver"). Affirmer makes
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the Waiver for the benefit of each member of the public at large and to the
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detriment of Affirmer's heirs and successors, fully intending that such Waiver
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shall not be subject to revocation, rescission, cancellation, termination, or
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any other legal or equitable action to disrupt the quiet enjoyment of the Work
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by the public as contemplated by Affirmer's express Statement of Purpose.
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3. Public License Fallback. Should any part of the Waiver for any reason be
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judged legally invalid or ineffective under applicable law, then the Waiver
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shall be preserved to the maximum extent permitted taking into account
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Affirmer's express Statement of Purpose. In addition, to the extent the Waiver
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is so judged Affirmer hereby grants to each affected person a royalty-free,
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non transferable, non sublicensable, non exclusive, irrevocable and
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unconditional license to exercise Affirmer's Copyright and Related Rights in
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the Work (i) in all territories worldwide, (ii) for the maximum duration
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provided by applicable law or treaty (including future time extensions), (iii)
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in any current or future medium and for any number of copies, and (iv) for any
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purpose whatsoever, including without limitation commercial, advertising or
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promotional purposes (the "License"). The License shall be deemed effective as
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of the date CC0 was applied by Affirmer to the Work. Should any part of the
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License for any reason be judged legally invalid or ineffective under
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applicable law, such partial invalidity or ineffectiveness shall not
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invalidate the remainder of the License, and in such case Affirmer hereby
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affirms that he or she will not (i) exercise any of his or her remaining
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Copyright and Related Rights in the Work or (ii) assert any associated claims
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||||||
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and causes of action with respect to the Work, in either case contrary to
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Affirmer's express Statement of Purpose.
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4. Limitations and Disclaimers.
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a. No trademark or patent rights held by Affirmer are waived, abandoned,
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surrendered, licensed or otherwise affected by this document.
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b. Affirmer offers the Work as-is and makes no representations or warranties
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|
of any kind concerning the Work, express, implied, statutory or otherwise,
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|
including without limitation warranties of title, merchantability, fitness
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for a particular purpose, non infringement, or the absence of latent or
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other defects, accuracy, or the present or absence of errors, whether or not
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discoverable, all to the greatest extent permissible under applicable law.
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c. Affirmer disclaims responsibility for clearing rights of other persons
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that may apply to the Work or any use thereof, including without limitation
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any person's Copyright and Related Rights in the Work. Further, Affirmer
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disclaims responsibility for obtaining any necessary consents, permissions
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or other rights required for any use of the Work.
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d. Affirmer understands and acknowledges that Creative Commons is not a
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party to this document and has no duty or obligation with respect to this
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CC0 or use of the Work.
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For more information, please see
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<http://creativecommons.org/publicdomain/zero/1.0/>
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36
Makefile
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36
Makefile
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DESTDIR ?=
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PREFIX ?= /usr/local
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EXEC_PREFIX ?= $(PREFIX)
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BINDIR ?= $(EXEC_PREFIX)/bin
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CFLAGS += -Os -g -Wall -Wextra -pedantic
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CPPFLAGS +=
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LDFLAGS +=
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BINS := plainhex plainunhex
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.SUFFIXES:
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.SUFFIXES: .c .o
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.PHONY: all install uninstall clean distclean
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all: $(BINS)
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plainhex: plainhex.o
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$(CC) -o $@ $< $(LDFLAGS)
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plainunhex: plainunhex.o
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$(CC) -o $@ $< $(LDFLAGS)
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.c.o:
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$(CC) -c $(CFLAGS) $(CPPFLAGS) -o $@ $<
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install: $(BINS)
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install -D -m 755 -t '$(DESTDIR)$(BINDIR)' $(BINS)
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uninstall:
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cd $(DESTDIR)$(BINDIR) && rm $(BINS)
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clean:
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rm -f $(BINS) $(LIBEXECS) $(TOOLS) *.o
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distclean: clean
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38
plainhex.c
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38
plainhex.c
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#include <assert.h>
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#include <err.h>
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#include <stdio.h>
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char nybble(int n) {
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assert(0 <= n && n <= 15);
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return "0123456789abcdef"[n];
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}
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int main(void) {
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for (;;) {
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int byte = getchar();
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if (byte == EOF) {
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if (feof(stdin)) {
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break;
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} else {
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err(1, "Error reading byte");
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}
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}
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if (putchar(nybble(byte >> 4)) == EOF) {
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err(1, "Error writing high nybble");
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}
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if (putchar(nybble(byte & 0xf)) == EOF) {
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err(1, "Error writing low nybble");
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}
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}
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if (putchar('\n') == EOF) {
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err(1, "Error writing terminating newline");
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}
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if (fflush(stdout) == EOF) {
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err(1, "Error flushing stdout");
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}
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return 0;
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}
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70
plainunhex.c
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#include <assert.h>
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#include <err.h>
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#include <stdbool.h>
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#include <stdio.h>
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int nybble(char c) {
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if ('0' <= c && c <= '9') {
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return c - '0';
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} else if ('A' <= c && c <= 'F') {
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return c - 'A' + 10;
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} else if ('a' <= c && c <= 'f') {
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return c - 'a' + 10;
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} else {
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return -1;
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}
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}
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int main(void) {
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for (;;) {
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int high_nybble;
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bool eof_reached = false;
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for (;;) {
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char c = getchar();
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if (c == EOF) {
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if (feof(stdin)) {
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eof_reached = true;
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break;
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} else {
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err(1, "Error reading high nybble");
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}
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}
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high_nybble = nybble(c);
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if (high_nybble != -1) {
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break;
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}
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}
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if (eof_reached) {
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break;
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}
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int low_nybble;
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for (;;) {
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char c = getchar();
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if (c == EOF) {
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if (feof(stdin)) {
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errx(1, "Expected low nybble");
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} else {
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err(1, "Error reading low nybble");
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}
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}
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low_nybble = nybble(c);
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if (low_nybble != -1) {
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break;
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}
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}
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if (putchar((high_nybble << 4) | low_nybble) == EOF) {
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err(1, "Error writing byte");
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}
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}
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if (fflush(stdout) == EOF) {
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err(1, "Error flushing stdout");
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}
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return 0;
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}
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