conv.c revision 51208
1223313Snwhitehorn/*- 2223313Snwhitehorn * Copyright (c) 1991, 1993, 1994 3223313Snwhitehorn * The Regents of the University of California. All rights reserved. 4223313Snwhitehorn * 5223313Snwhitehorn * This code is derived from software contributed to Berkeley by 6223313Snwhitehorn * Keith Muller of the University of California, San Diego and Lance 7223313Snwhitehorn * Visser of Convex Computer Corporation. 8223313Snwhitehorn * 9223313Snwhitehorn * Redistribution and use in source and binary forms, with or without 10223313Snwhitehorn * modification, are permitted provided that the following conditions 11223313Snwhitehorn * are met: 12223313Snwhitehorn * 1. Redistributions of source code must retain the above copyright 13223313Snwhitehorn * notice, this list of conditions and the following disclaimer. 14223313Snwhitehorn * 2. Redistributions in binary form must reproduce the above copyright 15223313Snwhitehorn * notice, this list of conditions and the following disclaimer in the 16223313Snwhitehorn * documentation and/or other materials provided with the distribution. 17223313Snwhitehorn * 3. All advertising materials mentioning features or use of this software 18223313Snwhitehorn * must display the following acknowledgement: 19223313Snwhitehorn * This product includes software developed by the University of 20223313Snwhitehorn * California, Berkeley and its contributors. 21223313Snwhitehorn * 4. Neither the name of the University nor the names of its contributors 22223313Snwhitehorn * may be used to endorse or promote products derived from this software 23223313Snwhitehorn * without specific prior written permission. 24223313Snwhitehorn * 25223313Snwhitehorn * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26223313Snwhitehorn * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27223313Snwhitehorn * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28223313Snwhitehorn * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29223313Snwhitehorn * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30223313Snwhitehorn * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31223313Snwhitehorn * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32223313Snwhitehorn * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33223313Snwhitehorn * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34223313Snwhitehorn * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35223313Snwhitehorn * SUCH DAMAGE. 36223313Snwhitehorn */ 37223313Snwhitehorn 38223313Snwhitehorn#ifndef lint 39223313Snwhitehorn#if 0 40223313Snwhitehornstatic char sccsid[] = "@(#)conv.c 8.3 (Berkeley) 4/2/94"; 41223313Snwhitehorn#endif 42223313Snwhitehornstatic const char rcsid[] = 43223313Snwhitehorn "$FreeBSD: head/bin/dd/conv.c 51208 1999-09-12 16:51:53Z green $"; 44223313Snwhitehorn#endif /* not lint */ 45223313Snwhitehorn 46223313Snwhitehorn#include <sys/param.h> 47223313Snwhitehorn 48223313Snwhitehorn#include <err.h> 49223313Snwhitehorn#include <string.h> 50223313Snwhitehorn 51223313Snwhitehorn#include "dd.h" 52223313Snwhitehorn#include "extern.h" 53223313Snwhitehorn 54223313Snwhitehorn/* 55223313Snwhitehorn * def -- 56223313Snwhitehorn * Copy input to output. Input is buffered until reaches obs, and then 57223313Snwhitehorn * output until less than obs remains. Only a single buffer is used. 58223313Snwhitehorn * Worst case buffer calculation is (ibs + obs - 1). 59223313Snwhitehorn */ 60223313Snwhitehornvoid 61223313Snwhitehorndef() 62223313Snwhitehorn{ 63223313Snwhitehorn u_char *inp; 64223313Snwhitehorn const u_char *t; 65223313Snwhitehorn size_t cnt; 66223313Snwhitehorn 67223313Snwhitehorn if ((t = ctab) != NULL) 68223313Snwhitehorn for (inp = in.dbp - (cnt = in.dbrcnt); cnt--; ++inp) 69223313Snwhitehorn *inp = t[*inp]; 70227309Sed 71227309Sed /* Make the output buffer look right. */ 72223313Snwhitehorn out.dbp = in.dbp; 73223313Snwhitehorn out.dbcnt = in.dbcnt; 74223313Snwhitehorn 75223313Snwhitehorn if (in.dbcnt >= out.dbsz) { 76223313Snwhitehorn /* If the output buffer is full, write it. */ 77223313Snwhitehorn dd_out(0); 78223313Snwhitehorn 79223313Snwhitehorn /* 80223313Snwhitehorn * Ddout copies the leftover output to the beginning of 81223313Snwhitehorn * the buffer and resets the output buffer. Reset the 82223313Snwhitehorn * input buffer to match it. 83223313Snwhitehorn */ 84223313Snwhitehorn in.dbp = out.dbp; 85223313Snwhitehorn in.dbcnt = out.dbcnt; 86223313Snwhitehorn } 87223313Snwhitehorn} 88223313Snwhitehorn 89223313Snwhitehornvoid 90223313Snwhitehorndef_close() 91223313Snwhitehorn{ 92223313Snwhitehorn /* Just update the count, everything is already in the buffer. */ 93223313Snwhitehorn if (in.dbcnt) 94223313Snwhitehorn out.dbcnt = in.dbcnt; 95223313Snwhitehorn} 96223313Snwhitehorn 97223313Snwhitehorn/* 98223313Snwhitehorn * Copy variable length newline terminated records with a max size cbsz 99223313Snwhitehorn * bytes to output. Records less than cbs are padded with spaces. 100223313Snwhitehorn * 101223313Snwhitehorn * max in buffer: MAX(ibs, cbsz) 102223313Snwhitehorn * max out buffer: obs + cbsz 103223313Snwhitehorn */ 104223313Snwhitehornvoid 105223313Snwhitehornblock() 106223313Snwhitehorn{ 107223313Snwhitehorn u_char *inp, *outp; 108223313Snwhitehorn const u_char *t; 109223313Snwhitehorn size_t cnt, maxlen; 110223313Snwhitehorn static int intrunc; 111223313Snwhitehorn int ch = -1; 112223313Snwhitehorn 113223313Snwhitehorn /* 114223313Snwhitehorn * Record truncation can cross block boundaries. If currently in a 115223313Snwhitehorn * truncation state, keep tossing characters until reach a newline. 116223313Snwhitehorn * Start at the beginning of the buffer, as the input buffer is always 117223313Snwhitehorn * left empty. 118223313Snwhitehorn */ 119223313Snwhitehorn if (intrunc) { 120223461Snwhitehorn for (inp = in.db, cnt = in.dbrcnt; cnt && *inp++ != '\n'; --cnt) 121223461Snwhitehorn ; 122223313Snwhitehorn if (!cnt) { 123223461Snwhitehorn in.dbcnt = 0; 124223313Snwhitehorn in.dbp = in.db; 125223313Snwhitehorn return; 126223313Snwhitehorn } 127223313Snwhitehorn intrunc = 0; 128223313Snwhitehorn /* Adjust the input buffer numbers. */ 129223313Snwhitehorn in.dbcnt = cnt - 1; 130223313Snwhitehorn in.dbp = inp + cnt - 1; 131223313Snwhitehorn } 132223461Snwhitehorn 133223313Snwhitehorn /* 134223313Snwhitehorn * Copy records (max cbsz size chunks) into the output buffer. The 135223313Snwhitehorn * translation is done as we copy into the output buffer. 136223313Snwhitehorn */ 137223461Snwhitehorn ch = 0; 138223461Snwhitehorn for (inp = in.dbp - in.dbcnt, outp = out.dbp; in.dbcnt;) { 139223313Snwhitehorn maxlen = MIN(cbsz, in.dbcnt); 140223313Snwhitehorn if ((t = ctab) != NULL) 141223313Snwhitehorn for (cnt = 0; cnt < maxlen && (ch = *inp++) != '\n'; 142223313Snwhitehorn ++cnt) 143223313Snwhitehorn *outp++ = t[ch]; 144223313Snwhitehorn else 145223313Snwhitehorn for (cnt = 0; cnt < maxlen && (ch = *inp++) != '\n'; 146223313Snwhitehorn ++cnt) 147223313Snwhitehorn *outp++ = ch; 148223313Snwhitehorn /* 149223313Snwhitehorn * Check for short record without a newline. Reassemble the 150223313Snwhitehorn * input block. 151223313Snwhitehorn */ 152223313Snwhitehorn if (ch != '\n' && in.dbcnt < cbsz) { 153223313Snwhitehorn (void)memmove(in.db, in.dbp - in.dbcnt, in.dbcnt); 154223313Snwhitehorn break; 155223313Snwhitehorn } 156223313Snwhitehorn 157223313Snwhitehorn /* Adjust the input buffer numbers. */ 158223313Snwhitehorn in.dbcnt -= cnt; 159223313Snwhitehorn if (ch == '\n') 160223313Snwhitehorn --in.dbcnt; 161223313Snwhitehorn 162223461Snwhitehorn /* Pad short records with spaces. */ 163223313Snwhitehorn if (cnt < cbsz) 164223313Snwhitehorn (void)memset(outp, ctab ? ctab[' '] : ' ', cbsz - cnt); 165223313Snwhitehorn else { 166223313Snwhitehorn /* 167223313Snwhitehorn * If the next character wouldn't have ended the 168223313Snwhitehorn * block, it's a truncation. 169223313Snwhitehorn */ 170223313Snwhitehorn if (!in.dbcnt || *inp != '\n') 171223313Snwhitehorn ++st.trunc; 172223313Snwhitehorn 173223313Snwhitehorn /* Toss characters to a newline. */ 174223313Snwhitehorn for (; in.dbcnt && *inp++ != '\n'; --in.dbcnt); 175223313Snwhitehorn if (!in.dbcnt) 176223313Snwhitehorn intrunc = 1; 177223313Snwhitehorn else 178223313Snwhitehorn --in.dbcnt; 179223313Snwhitehorn } 180223313Snwhitehorn 181223313Snwhitehorn /* Adjust output buffer numbers. */ 182223313Snwhitehorn out.dbp += cbsz; 183223313Snwhitehorn if ((out.dbcnt += cbsz) >= out.dbsz) 184223313Snwhitehorn dd_out(0); 185223313Snwhitehorn outp = out.dbp; 186223313Snwhitehorn } 187223313Snwhitehorn in.dbp = in.db + in.dbcnt; 188223313Snwhitehorn} 189223313Snwhitehorn 190223313Snwhitehornvoid 191223313Snwhitehornblock_close() 192223313Snwhitehorn{ 193223313Snwhitehorn /* 194223313Snwhitehorn * Copy any remaining data into the output buffer and pad to a record. 195223313Snwhitehorn * Don't worry about truncation or translation, the input buffer is 196223313Snwhitehorn * always empty when truncating, and no characters have been added for 197223313Snwhitehorn * translation. The bottom line is that anything left in the input 198223313Snwhitehorn * buffer is a truncated record. Anything left in the output buffer 199223313Snwhitehorn * just wasn't big enough. 200223313Snwhitehorn */ 201223313Snwhitehorn if (in.dbcnt) { 202223313Snwhitehorn ++st.trunc; 203223313Snwhitehorn (void)memmove(out.dbp, in.dbp - in.dbcnt, in.dbcnt); 204223313Snwhitehorn (void)memset(out.dbp + in.dbcnt, ctab ? ctab[' '] : ' ', 205223313Snwhitehorn cbsz - in.dbcnt); 206223313Snwhitehorn out.dbcnt += cbsz; 207223461Snwhitehorn } 208223313Snwhitehorn} 209223313Snwhitehorn 210223313Snwhitehorn/* 211223313Snwhitehorn * Convert fixed length (cbsz) records to variable length. Deletes any 212223313Snwhitehorn * trailing blanks and appends a newline. 213223313Snwhitehorn * 214223461Snwhitehorn * max in buffer: MAX(ibs, cbsz) + cbsz 215223313Snwhitehorn * max out buffer: obs + cbsz 216223313Snwhitehorn */ 217223461Snwhitehornvoid 218223461Snwhitehornunblock() 219223313Snwhitehorn{ 220223461Snwhitehorn u_char *inp; 221223313Snwhitehorn const u_char *t; 222223313Snwhitehorn size_t cnt; 223223313Snwhitehorn 224223313Snwhitehorn /* Translation and case conversion. */ 225223313Snwhitehorn if ((t = ctab) != NULL) 226223313Snwhitehorn for (cnt = in.dbrcnt, inp = in.dbp; cnt--;) 227223313Snwhitehorn *--inp = t[*inp]; 228223313Snwhitehorn /* 229223313Snwhitehorn * Copy records (max cbsz size chunks) into the output buffer. The 230223313Snwhitehorn * translation has to already be done or we might not recognize the 231223313Snwhitehorn * spaces. 232223461Snwhitehorn */ 233223313Snwhitehorn for (inp = in.db; in.dbcnt >= cbsz; inp += cbsz, in.dbcnt -= cbsz) { 234223313Snwhitehorn for (t = inp + cbsz - 1; t >= inp && *t == ' '; --t) 235223313Snwhitehorn ; 236223316Snwhitehorn if (t >= inp) { 237223316Snwhitehorn cnt = t - inp + 1; 238223313Snwhitehorn (void)memmove(out.dbp, inp, cnt); 239223313Snwhitehorn out.dbp += cnt; 240223313Snwhitehorn out.dbcnt += cnt; 241223313Snwhitehorn } 242223313Snwhitehorn *out.dbp++ = '\n'; 243223313Snwhitehorn if (++out.dbcnt >= out.dbsz) 244223461Snwhitehorn dd_out(0); 245223313Snwhitehorn } 246223313Snwhitehorn if (in.dbcnt) 247223313Snwhitehorn (void)memmove(in.db, in.dbp - in.dbcnt, in.dbcnt); 248223313Snwhitehorn in.dbp = in.db + in.dbcnt; 249223313Snwhitehorn} 250223313Snwhitehorn 251223313Snwhitehornvoid 252223313Snwhitehornunblock_close() 253223313Snwhitehorn{ 254223313Snwhitehorn u_char *t; 255223313Snwhitehorn size_t cnt; 256223313Snwhitehorn 257223316Snwhitehorn if (in.dbcnt) { 258223316Snwhitehorn warnx("%s: short input record", in.name); 259223461Snwhitehorn for (t = in.db + in.dbcnt - 1; t >= in.db && *t == ' '; --t) 260223316Snwhitehorn ; 261223461Snwhitehorn if (t >= in.db) { 262223461Snwhitehorn cnt = t - in.db + 1; 263223313Snwhitehorn (void)memmove(out.dbp, in.db, cnt); 264223461Snwhitehorn out.dbp += cnt; 265223316Snwhitehorn out.dbcnt += cnt; 266223313Snwhitehorn } 267223316Snwhitehorn ++out.dbcnt; 268223313Snwhitehorn *out.dbp++ = '\n'; 269223313Snwhitehorn } 270223461Snwhitehorn} 271223461Snwhitehorn