1 /* $OpenBSD: cut.c,v 1.7 2002/02/16 21:27:56 millert Exp $ */ 2 3 /*- 4 * Copyright (c) 1992, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * Copyright (c) 1992, 1993, 1994, 1995, 1996 7 * Keith Bostic. All rights reserved. 8 * 9 * See the LICENSE file for redistribution information. 10 */ 11 12 #include "config.h" 13 14 #ifndef lint 15 static const char sccsid[] = "@(#)cut.c 10.10 (Berkeley) 9/15/96"; 16 #endif /* not lint */ 17 18 #include <sys/types.h> 19 #include <sys/queue.h> 20 21 #include <bitstring.h> 22 #include <ctype.h> 23 #include <errno.h> 24 #include <fcntl.h> 25 #include <limits.h> 26 #include <stdio.h> 27 #include <stdlib.h> 28 #include <string.h> 29 30 #include "common.h" 31 32 static void cb_rotate(SCR *); 33 34 /* 35 * cut -- 36 * Put a range of lines/columns into a TEXT buffer. 37 * 38 * There are two buffer areas, both found in the global structure. The first 39 * is the linked list of all the buffers the user has named, the second is the 40 * unnamed buffer storage. There is a pointer, too, which is the current 41 * default buffer, i.e. it may point to the unnamed buffer or a named buffer 42 * depending on into what buffer the last text was cut. Logically, in both 43 * delete and yank operations, if the user names a buffer, the text is cut 44 * into it. If it's a delete of information on more than a single line, the 45 * contents of the numbered buffers are rotated up one, the contents of the 46 * buffer named '9' are discarded, and the text is cut into the buffer named 47 * '1'. The text is always cut into the unnamed buffer. 48 * 49 * In all cases, upper-case buffer names are the same as lower-case names, 50 * with the exception that they cause the buffer to be appended to instead 51 * of replaced. Note, however, that if text is appended to a buffer, the 52 * default buffer only contains the appended text, not the entire contents 53 * of the buffer. 54 * 55 * !!! 56 * The contents of the default buffer would disappear after most operations 57 * in historic vi. It's unclear that this is useful, so we don't bother. 58 * 59 * When users explicitly cut text into the numeric buffers, historic vi became 60 * genuinely strange. I've never been able to figure out what was supposed to 61 * happen. It behaved differently if you deleted text than if you yanked text, 62 * and, in the latter case, the text was appended to the buffer instead of 63 * replacing the contents. Hopefully it's not worth getting right, and here 64 * we just treat the numeric buffers like any other named buffer. 65 * 66 * PUBLIC: int cut(SCR *, CHAR_T *, MARK *, MARK *, int); 67 */ 68 int 69 cut(sp, namep, fm, tm, flags) 70 SCR *sp; 71 CHAR_T *namep; 72 MARK *fm, *tm; 73 int flags; 74 { 75 CB *cbp; 76 CHAR_T name; 77 recno_t lno; 78 int append, copy_one, copy_def; 79 80 /* 81 * If the user specified a buffer, put it there. (This may require 82 * a copy into the numeric buffers. We do the copy so that we don't 83 * have to reference count and so we don't have to deal with things 84 * like appends to buffers that are used multiple times.) 85 * 86 * Otherwise, if it's supposed to be put in a numeric buffer (usually 87 * a delete) put it there. The rules for putting things in numeric 88 * buffers were historically a little strange. There were three cases. 89 * 90 * 1: Some motions are always line mode motions, which means 91 * that the cut always goes into the numeric buffers. 92 * 2: Some motions aren't line mode motions, e.g. d10w, but 93 * can cross line boundaries. For these commands, if the 94 * cut crosses a line boundary, it goes into the numeric 95 * buffers. This includes most of the commands. 96 * 3: Some motions aren't line mode motions, e.g. d`<char>, 97 * but always go into the numeric buffers, regardless. This 98 * was the commands: % ` / ? ( ) N n { } -- and nvi adds ^A. 99 * 100 * Otherwise, put it in the unnamed buffer. 101 */ 102 append = copy_one = copy_def = 0; 103 if (namep != NULL) { 104 name = *namep; 105 if (LF_ISSET(CUT_NUMREQ) || LF_ISSET(CUT_NUMOPT) && 106 (LF_ISSET(CUT_LINEMODE) || fm->lno != tm->lno)) { 107 copy_one = 1; 108 cb_rotate(sp); 109 } 110 if ((append = isupper(name)) == 1) { 111 if (!copy_one) 112 copy_def = 1; 113 name = tolower(name); 114 } 115 namecb: CBNAME(sp, cbp, name); 116 } else if (LF_ISSET(CUT_NUMREQ) || LF_ISSET(CUT_NUMOPT) && 117 (LF_ISSET(CUT_LINEMODE) || fm->lno != tm->lno)) { 118 name = '1'; 119 cb_rotate(sp); 120 goto namecb; 121 } else 122 cbp = &sp->gp->dcb_store; 123 124 copyloop: 125 /* 126 * If this is a new buffer, create it and add it into the list. 127 * Otherwise, if it's not an append, free its current contents. 128 */ 129 if (cbp == NULL) { 130 CALLOC_RET(sp, cbp, CB *, 1, sizeof(CB)); 131 cbp->name = name; 132 CIRCLEQ_INIT(&cbp->textq); 133 LIST_INSERT_HEAD(&sp->gp->cutq, cbp, q); 134 } else if (!append) { 135 text_lfree(&cbp->textq); 136 cbp->len = 0; 137 cbp->flags = 0; 138 } 139 140 141 /* In line mode, it's pretty easy, just cut the lines. */ 142 if (LF_ISSET(CUT_LINEMODE)) { 143 cbp->flags |= CB_LMODE; 144 for (lno = fm->lno; lno <= tm->lno; ++lno) 145 if (cut_line(sp, lno, 0, CUT_LINE_TO_EOL, cbp)) 146 goto cut_line_err; 147 } else { 148 /* 149 * Get the first line. A length of CUT_LINE_TO_EOL causes 150 * cut_line() to cut from the MARK to the end of the line. 151 */ 152 if (cut_line(sp, fm->lno, fm->cno, fm->lno != tm->lno ? 153 CUT_LINE_TO_EOL : (tm->cno - fm->cno) + 1, cbp)) 154 goto cut_line_err; 155 156 /* Get the intermediate lines. */ 157 for (lno = fm->lno; ++lno < tm->lno;) 158 if (cut_line(sp, lno, 0, CUT_LINE_TO_EOL, cbp)) 159 goto cut_line_err; 160 161 /* Get the last line. */ 162 if (tm->lno != fm->lno && 163 cut_line(sp, lno, 0, tm->cno + 1, cbp)) 164 goto cut_line_err; 165 } 166 167 append = 0; /* Only append to the named buffer. */ 168 sp->gp->dcbp = cbp; /* Repoint the default buffer on each pass. */ 169 170 if (copy_one) { /* Copy into numeric buffer 1. */ 171 name = '1'; 172 CBNAME(sp, cbp, name); 173 copy_one = 0; 174 goto copyloop; 175 } 176 if (copy_def) { /* Copy into the default buffer. */ 177 cbp = &sp->gp->dcb_store; 178 copy_def = 0; 179 goto copyloop; 180 } 181 return (0); 182 183 cut_line_err: 184 text_lfree(&cbp->textq); 185 cbp->len = 0; 186 cbp->flags = 0; 187 return (1); 188 } 189 190 /* 191 * cb_rotate -- 192 * Rotate the numbered buffers up one. 193 */ 194 static void 195 cb_rotate(sp) 196 SCR *sp; 197 { 198 CB *cbp, *del_cbp; 199 200 del_cbp = NULL; 201 for (cbp = sp->gp->cutq.lh_first; cbp != NULL; cbp = cbp->q.le_next) 202 switch(cbp->name) { 203 case '1': 204 cbp->name = '2'; 205 break; 206 case '2': 207 cbp->name = '3'; 208 break; 209 case '3': 210 cbp->name = '4'; 211 break; 212 case '4': 213 cbp->name = '5'; 214 break; 215 case '5': 216 cbp->name = '6'; 217 break; 218 case '6': 219 cbp->name = '7'; 220 break; 221 case '7': 222 cbp->name = '8'; 223 break; 224 case '8': 225 cbp->name = '9'; 226 break; 227 case '9': 228 del_cbp = cbp; 229 break; 230 } 231 if (del_cbp != NULL) { 232 LIST_REMOVE(del_cbp, q); 233 text_lfree(&del_cbp->textq); 234 free(del_cbp); 235 } 236 } 237 238 /* 239 * cut_line -- 240 * Cut a portion of a single line. 241 * 242 * PUBLIC: int cut_line(SCR *, recno_t, size_t, size_t, CB *); 243 */ 244 int 245 cut_line(sp, lno, fcno, clen, cbp) 246 SCR *sp; 247 recno_t lno; 248 size_t fcno, clen; 249 CB *cbp; 250 { 251 TEXT *tp; 252 size_t len; 253 char *p; 254 255 /* Get the line. */ 256 if (db_get(sp, lno, DBG_FATAL, &p, &len)) 257 return (1); 258 259 /* Create a TEXT structure that can hold the entire line. */ 260 if ((tp = text_init(sp, NULL, 0, len)) == NULL) 261 return (1); 262 263 /* 264 * If the line isn't empty and it's not the entire line, 265 * copy the portion we want, and reset the TEXT length. 266 */ 267 if (len != 0) { 268 if (clen == CUT_LINE_TO_EOL) 269 clen = len - fcno; 270 memcpy(tp->lb, p + fcno, clen); 271 tp->len = clen; 272 } 273 274 /* Append to the end of the cut buffer. */ 275 CIRCLEQ_INSERT_TAIL(&cbp->textq, tp, q); 276 cbp->len += tp->len; 277 278 return (0); 279 } 280 281 /* 282 * cut_close -- 283 * Discard all cut buffers. 284 * 285 * PUBLIC: void cut_close(GS *); 286 */ 287 void 288 cut_close(gp) 289 GS *gp; 290 { 291 CB *cbp; 292 293 /* Free cut buffer list. */ 294 while ((cbp = gp->cutq.lh_first) != NULL) { 295 if (cbp->textq.cqh_first != (void *)&cbp->textq) 296 text_lfree(&cbp->textq); 297 LIST_REMOVE(cbp, q); 298 free(cbp); 299 } 300 301 /* Free default cut storage. */ 302 cbp = &gp->dcb_store; 303 if (cbp->textq.cqh_first != (void *)&cbp->textq) 304 text_lfree(&cbp->textq); 305 } 306 307 /* 308 * text_init -- 309 * Allocate a new TEXT structure. 310 * 311 * PUBLIC: TEXT *text_init(SCR *, const char *, size_t, size_t); 312 */ 313 TEXT * 314 text_init(sp, p, len, total_len) 315 SCR *sp; 316 const char *p; 317 size_t len, total_len; 318 { 319 TEXT *tp; 320 321 CALLOC(sp, tp, TEXT *, 1, sizeof(TEXT)); 322 if (tp == NULL) 323 return (NULL); 324 /* ANSI C doesn't define a call to malloc(3) for 0 bytes. */ 325 if ((tp->lb_len = total_len) != 0) { 326 MALLOC(sp, tp->lb, CHAR_T *, tp->lb_len); 327 if (tp->lb == NULL) { 328 free(tp); 329 return (NULL); 330 } 331 if (p != NULL && len != 0) 332 memcpy(tp->lb, p, len); 333 } 334 tp->len = len; 335 return (tp); 336 } 337 338 /* 339 * text_lfree -- 340 * Free a chain of text structures. 341 * 342 * PUBLIC: void text_lfree(TEXTH *); 343 */ 344 void 345 text_lfree(headp) 346 TEXTH *headp; 347 { 348 TEXT *tp; 349 350 while ((tp = headp->cqh_first) != (void *)headp) { 351 CIRCLEQ_REMOVE(headp, tp, q); 352 text_free(tp); 353 } 354 } 355 356 /* 357 * text_free -- 358 * Free a text structure. 359 * 360 * PUBLIC: void text_free(TEXT *); 361 */ 362 void 363 text_free(tp) 364 TEXT *tp; 365 { 366 if (tp->lb != NULL) 367 free(tp->lb); 368 free(tp); 369 } 370