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/* Time-stamp: <2008-04-03 19:47:59 poser>
*
* This program is a filter that reverses its input character by character.
* It works on both ASCII and UTF-8 Unicode.
*
* Copyright (C) 2007 William J. Poser (billposer@alum.mit.edu)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 3 the GNU General Public License
* as published by the Free Software Foundation.
*
* 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
* or go to the web page: http://www.gnu.org/licenses/gpl.txt.
*/
#include "config.h"
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#ifdef HAVE_LOCALE_H
#include <locale.h>
#endif
#ifdef HAVE_LIBINTL_H
#include <libintl.h>
#else
#define gettext(x) (x)
#endif
char compdate[]="Compiled " __DATE__ " " __TIME__ ;
char pgname[]="unireverse";
void
ShowUsage(void){
fprintf(stderr,"Read UTF-8 input line-by-line and emit reversed character-by-character.\n");
fprintf(stderr," -h Print help information.\n");
fprintf(stderr," -v Print version information.\n");
putc('\n',stderr);
}
void
ShowVersion(void){
fprintf(stderr,"\n%s %s\n",pgname,PACKAGE_VERSION);
fprintf(stderr,"%s\n",compdate);
fprintf(stderr,"Copyright (C) 2007 William J. Poser\n");
fprintf(stderr,"This program is free software; you can redistribute it and/or modify\n");
fprintf(stderr,"it under the terms of version 3 of the GNU General Public License\n");
fprintf(stderr,"as published by the Free Software Foundation.\n");
fprintf(stderr,"Report bugs to: billposer@alum.mit.edu\n");
}
static const char TrailingBytes[256] = {
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5
};
int main(int ac, char **av) {
int len;
int i;
int j;
int PreviousLeadByte;
char *obuf;
char *optr;
int BytesInChar;
char *ibuf;
unsigned long LineCnt = 0L;
char * GetLine(FILE *, int *);
if (ac > 1) {
if (av[1][0] == '-') {
if(av[1][1] == 'v') {ShowVersion(); exit(1);}
else if(av[1][1] == 'h') {ShowUsage(); exit(1);}
else {fprintf(stderr,"Option %c not recognized.\n",av[1][1]); exit(2);}
}
ShowUsage();exit(1);
}
/*
* The stratagey here is to work from the end of the line looking for
* lead bytes. On finding one, we emit it plus the requisite number of
* continuation bytes.
*/
while(1) {
ibuf = GetLine(stdin,&len);
if(len < 0) break;
LineCnt++;
if(len == 0) putchar('\n');
obuf = malloc((len + 1) * sizeof(char));
if(!obuf) {
fprintf(stderr,"unirev: failed to allocate storage.\n");
exit(2);
}
optr = obuf;
PreviousLeadByte = len;
for (i = len-1; i >= 0; i--) {
if (ibuf[i] >= 0) {
*optr++ = ibuf[i]; /* ASCII character */
PreviousLeadByte = i;
}
else if (ibuf[i] & 0x40) {
BytesInChar = 1 + (int) TrailingBytes[(unsigned char) ibuf[i]];
if (i + BytesInChar > PreviousLeadByte) {
fprintf(stderr,"Truncated UTF-8 sequence at byte %d of line %lu\n",i+1,LineCnt);
fprintf(stderr,"%d continuation bytes %s required but only %d %s present.\n",
BytesInChar-1,
(BytesInChar-1) >1?"are":"is",
PreviousLeadByte-i-1,
(PreviousLeadByte-i-i)>1?"are":"is");
exit(3);
}
PreviousLeadByte = i;
for(j=0; j < BytesInChar; j++) *optr++ = ibuf[i+j];
}
}
*optr = '\0';
puts(obuf);
free(obuf);
free(ibuf);
}
exit(0);
}
/*
* Read a line of arbitrary length from a file.
*
* Return a pointer to the null-terminated string allocated, or null on failure
* to allocate sufficient storage.
* It is the responsibility of the caller to free the space allocated.
*
* The length of the line is placed in the variable pointed to by
* the second argument. (-1) is placed in this variable on EOF.
*/
#define INITLENGTH 32
char * GetLine(FILE *fp, int *LineLength)
{
char c;
int Available;
int CharsRead;
char *Line;
int BytesRead;
Available = INITLENGTH;
CharsRead=0;
BytesRead=0;
Line = (char *) malloc((size_t)Available);
if(Line == (char *) 0) return (Line);
while(1){
c=getc(fp);
if(c == '\n'){
Line[CharsRead]='\0';
*LineLength=CharsRead;
return(Line);
}
if(c == EOF){
Line[CharsRead]='\0';
if(BytesRead == 0) *LineLength = (-1); /* Signal EOF */
else *LineLength=CharsRead;
return(Line);
}
BytesRead++;
if(CharsRead == (Available-1)){ /* -1 because of null */
Available += INITLENGTH/2;
Line = (char *) realloc( (void *) Line, (size_t) (Available * sizeof (char)));
if(Line == (char *) 0) return(Line);
}
Line[CharsRead++]=c;
}
}
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