make rot13 into rot
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19438441d2
commit
7410086b60
@ -1,28 +1,5 @@
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all: rot13
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rot-ascii.o: rot-ascii.c rot-ascii.h
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clean:
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rm -rf ../dist/rot13 ../dist/rot13.tar ../dist/rot13.tar.gz rot13
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dist: ../dist/rot13.tar.gz
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sane: rot13.c ../include/sysexits.h
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$(CC) -DDONT_USE_SYSTEM_SYSEXITS -o rot13 rot13.c
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rot13: rot13.c
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$(CC) -o rot13 rot13.c
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../dist/rot13: rot13
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mkdir -p ../dist/rot13.tmp/bin/ ../dist/rot13.tmp/share/man/man1/
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cp rot13 ../dist/rot13.tmp/bin/rot13
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cp rot13.1 ../dist/rot13.tmp/share/man/man1/rot13.1
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mv ../dist/rot13.tmp ../dist/rot13
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../dist/rot13.tar: ../dist/rot13
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cd ../dist/rot13 && pax -w -x ustar . >../rot13.tar.tmp
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mv ../dist/rot13.tar.tmp ../dist/rot13.tar
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../dist/rot13.tar.gz: ../dist/rot13.tar
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gzip -c <../dist/rot13.tar >../dist/rot13.tar.gz.tmp
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mv ../dist/rot13.tar.gz.tmp ../dist/rot13.tar.gz
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.PHONY: all clean sane
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rot-ascii: rot-ascii.o
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$(CC) $(CFLAGS) -c -o rot.o -include "rot-ascii.h" rot.c
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$(CC) $(CFLAGS) -o rot-ascii rot.o rot-ascii.o
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30
rot13/rot-ascii.c
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30
rot13/rot-ascii.c
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@ -0,0 +1,30 @@
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#include "rot-ascii.h"
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#include <stdlib.h> /* size_t */
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static CHAR
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caesar_lower(CHAR c, size_t r){
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static char alpha_lower[] = "abcdefghijklmnopqrstuvwxyz"
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"abcdefghijklmnopqrstuvwxyz";
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return : alpha_lower[c - alpha_lower[0]
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+ r % 26 /* length of alphabet */];
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}
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static CHAR
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caesar_upper(CHAR c, size_t r){
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static char alpha_upper[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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return alpha_upper[c - alpha_upper[0]
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+ r % 26 /* length of alphabet */];
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}
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CHAR
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caesar(CHAR c, size_t r){
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return !ISALPHA(c)
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? c
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: ISLOWER(c)
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? caesar_lower(c, r)
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: caesar_upper(c, r);
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}
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10
rot13/rot-ascii.h
Normal file
10
rot13/rot-ascii.h
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@ -0,0 +1,10 @@
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#define CHHR int
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#include <ctype.h> /* isalpha(3), islower(3), isupper(3) */
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#define ISALPHA(a) (((a) < 0x80) && isalpha(a))
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#define ISLOWER(a) (((a) < 0x80) && islower(a))
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#define ISUPPER(a) (((a) < 0x80) && isupper(a))
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#include <stdio.h> /* getc(3), putc(3), stdin, stdout, EOF */
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#define ENDOFFILE EOF
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#define GETC getc
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#define PUTC putc
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/* #include <stdlib.h> /* size_t */
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@ -1,71 +1,37 @@
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#include <stddef.h> /* stdin, stdout */
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/* When rot13(1) is a part of ~trinity/src, which doesn't assume the system has
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* <sysexits.h> and generates it out of a table. */
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#ifdef DONT_USE_SYSTEM_SYSEXITS
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# include "../include/sysexits.h" /* EX_OK, EX_USAGE */
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#else
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#include <errno.h> /* errno */
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#include <stdlib.h> /* strtol(3), size_t */
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#if !defined EX_OK || !defined EX_USAGE
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# include <sysexits.h> /* EX_OK, EX_USAGE */
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#endif
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#ifdef U_UNICODE_VERSION /* libicu Unicode support */
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# define CHARACTER UChar32
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CHAR caesar(CHAR c, size_t r);
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# include <uchar.h> /* u_isupper(3) */
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# define ISUPPER u_isupper
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# include <ustdio.h> /* U_EOF */
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# define ENDOFFILE U_EOF
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#else /* ifdef U_UNICODE_VERSION */
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# define CHARACTER int
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# include <ctype.h> /* isalpha(3), isupper(3) */
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# define ISALPHA isalpha
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# define ISUPPER isupper
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# include <stdio.h> /* getc(3), putc(3) */
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# define ENDOFFILE EOF
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# define GETC getc
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# define PUTC putc
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#endif /* ifdef U_UNICODE_VERSION */
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static char *program_name = "rot13";
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// /* Assumes this is a character in the provided glyph system.
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// * Probably not Unicode-capable but doesn't assume Alphabet.
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// * Returns `c` rotated around `a` by `r` characters. */
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// #include <string.h> /* strchr(3), strlen(3) */
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// static int
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// caesar(char c, int r, const char *a){
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// return a[(strchr(a, c) - a + r) % strlen(a)];
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// }
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/* Or... make some static arrays of the alphabet * 1.5, so c + '\0' + 13 is
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* always a valid index and always reflects the correct rotation (13 places).
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*/
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static char alpha_upper[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLM";
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static char alpha_lower[] = "abcdefghijklmnopqrstuvwxyzabcdefghijklm";
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static char *program_name = "rot";
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int main(int argc, char *argv[]){
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CHAR c;
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size_t r;
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if(argc > 1){
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fprintf(stderr, "Usage: %s\n",
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if(argc > 2){
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fprintf(stderr, "Usage: %s (rotation)\n",
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argv[0] == NULL ? program_name : argv[0]
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);
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return EX_USAGE;
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}
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{ /* rot13 */
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char *a; /* easier than doing freaky math */
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CHARACTER c;
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if(argc == 2){
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r = strtol(argv[1], &argv[1], 10);
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if(*argv[1] != '\0' || errno != 0){
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fprintf(stderr, "%s: Invalid rotation\n", argv[0]);
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return EX_USAGE;
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}
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}else
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r = 13; /* default to rot13 */
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while((c = GETC(stdin)) != ENDOFFILE)
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if(isalpha(c)){
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a = isupper(c) ? alpha_upper : alpha_lower;
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PUTC(a[c - a[0] + 13], stdout);
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}else
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PUTC(c, stdout);
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}
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while((c = GETC(stdin)) != ENDOFFILE)
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if(PUTC(caesar(c, r), stdout) == ENDOFFILE)
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break;
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return EX_OK;
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}
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