external/bsd/nvi/dist/ex/ex_global.c

   1 /*      $NetBSD: ex_global.c,v 1.4 2013/11/27 21:16:10 christos Exp $ */
   2 /*-
   3  * Copyright (c) 1992, 1993, 1994
   4  *      The Regents of the University of California.  All rights reserved.
   5  * Copyright (c) 1992, 1993, 1994, 1995, 1996
   6  *      Keith Bostic.  All rights reserved.
   7  *
   8  * See the LICENSE file for redistribution information.
   9  */
  10
  11 #include "config.h"
  12
  13 #ifndef lint
  14 static const char sccsid[] = "Id: ex_global.c,v 10.30 2001/06/25 15:19:16 skimo Exp  (Berkeley) Date: 2001/06/25 15:19:16 ";
  15 #endif /* not lint */
  16
  17 #include <sys/types.h>
  18 #include <sys/queue.h>
  19
  20 #include <bitstring.h>
  21 #include <ctype.h>
  22 #include <errno.h>
  23 #include <limits.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <unistd.h>
  28
  29 #include "../common/common.h"
  30
  31 enum which {GLOBAL, V};
  32
  33 static int ex_g_setup __P((SCR *, EXCMD *, enum which));
  34
  35 /*
  36  * ex_global -- [line [,line]] g[lobal][!] /pattern/ [commands]
  37  *      Exec on lines matching a pattern.
  38  *
  39  * PUBLIC: int ex_global __P((SCR *, EXCMD *));
  40  */
  41 int
  42 ex_global(SCR *sp, EXCMD *cmdp)
  43 {
  44         return (ex_g_setup(sp,
  45             cmdp, FL_ISSET(cmdp->iflags, E_C_FORCE) ? V : GLOBAL));
  46 }
  47
  48 /*
  49  * ex_v -- [line [,line]] v /pattern/ [commands]
  50  *      Exec on lines not matching a pattern.
  51  *
  52  * PUBLIC: int ex_v __P((SCR *, EXCMD *));
  53  */
  54 int
  55 ex_v(SCR *sp, EXCMD *cmdp)
  56 {
  57         return (ex_g_setup(sp, cmdp, V));
  58 }
  59
  60 /*
  61  * ex_g_setup --
  62  *      Ex global and v commands.
  63  */
  64 static int
  65 ex_g_setup(SCR *sp, EXCMD *cmdp, enum which cmd)
  66 {
  67         CHAR_T *ptrn, *p, *t;
  68         EXCMD *ecp;
  69         MARK myabs;
  70         RANGE *rp;
  71         busy_t btype;
  72         db_recno_t start, end;
  73         regmatch_t match[1];
  74         size_t len;
  75         int cnt, delim, eval;
  76         CHAR_T *dbp;
  77
  78         NEEDFILE(sp, cmdp);
  79
  80         if (F_ISSET(sp, SC_EX_GLOBAL)) {
  81                 msgq_wstr(sp, M_ERR, cmdp->cmd->name,
  82         "124|The %s command can't be used as part of a global or v command");
  83                 return (1);
  84         }
  85
  86         /*
  87          * Skip leading white space.  Historic vi allowed any non-alphanumeric
  88          * to serve as the global command delimiter.
  89          */
  90         if (cmdp->argc == 0)
  91                 goto usage;
  92         for (p = cmdp->argv[0]->bp; ISBLANK(*p); ++p);
  93         if (*p == '\0' || ISALNUM((UCHAR_T)*p) ||
  94             *p == '\\' || *p == '|' || *p == '\n') {
  95 usage:          ex_emsg(sp, cmdp->cmd->usage, EXM_USAGE);
  96                 return (1);
  97         }
  98         delim = *p++;
  99
 100         /*
 101          * Get the pattern string, toss escaped characters.
 102          *
 103          * QUOTING NOTE:
 104          * Only toss an escaped character if it escapes a delimiter.
 105          */
 106         for (ptrn = t = p;;) {
 107                 if (p[0] == '\0' || p[0] == delim) {
 108                         if (p[0] == delim)
 109                                 ++p;
 110                         /*
 111                          * !!!
 112                          * Nul terminate the pattern string -- it's passed
 113                          * to regcomp which doesn't understand anything else.
 114                          */
 115                         *t = L('\0');
 116                         break;
 117                 }
 118                 if (p[0] == L('\\')) {
 119                         if (p[1] == delim)
 120                                 ++p;
 121                         else if (p[1] == L('\\'))
 122                                 *t++ = *p++;
 123                 }
 124                 *t++ = *p++;
 125         }
 126
 127         /* If the pattern string is empty, use the last one. */
 128         if (*ptrn == L('\0')) {
 129                 if (sp->re == NULL) {
 130                         ex_emsg(sp, NULL, EXM_NOPREVRE);
 131                         return (1);
 132                 }
 133
 134                 /* Re-compile the RE if necessary. */
 135                 if (!F_ISSET(sp, SC_RE_SEARCH) &&
 136                     re_compile(sp, sp->re, sp->re_len,
 137                     NULL, NULL, &sp->re_c, SEARCH_CSEARCH | SEARCH_MSG))
 138                         return (1);
 139         } else {
 140                 /* Compile the RE. */
 141                 if (re_compile(sp, ptrn, t - ptrn, &sp->re,
 142                     &sp->re_len, &sp->re_c, SEARCH_CSEARCH | SEARCH_MSG))
 143                         return (1);
 144
 145                 /*
 146                  * Set saved RE.  Historic practice is that globals set
 147                  * direction as well as the RE.
 148                  */
 149                 sp->searchdir = FORWARD;
 150         }
 151
 152         /* The global commands always set the previous context mark. */
 153         myabs.lno = sp->lno;
 154         myabs.cno = sp->cno;
 155         if (mark_set(sp, ABSMARK1, &myabs, 1))
 156                 return (1);
 157
 158         /* Get an EXCMD structure. */
 159         CALLOC_RET(sp, ecp, EXCMD *, 1, sizeof(EXCMD));
 160         TAILQ_INIT(&ecp->rq);
 161
 162         /*
 163          * Get a copy of the command string; the default command is print.
 164          * Don't worry about a set of <blank>s with no command, that will
 165          * default to print in the ex parser.  We need to have two copies
 166          * because the ex parser may step on the command string when it's
 167          * parsing it.
 168          */
 169         if ((len = cmdp->argv[0]->len - (p - cmdp->argv[0]->bp)) == 0) {
 170                 p = __UNCONST(L("p"));
 171                 len = 1;
 172         }
 173
 174         MALLOC_GOTO(sp, ecp->cp, CHAR_T *, (len * 2) * sizeof(CHAR_T));
 175         ecp->o_cp = ecp->cp;
 176         ecp->o_clen = len;
 177         MEMCPYW(ecp->cp + len, p, len);
 178         ecp->range_lno = OOBLNO;
 179         FL_SET(ecp->agv_flags, cmd == GLOBAL ? AGV_GLOBAL : AGV_V);
 180         LIST_INSERT_HEAD(&sp->wp->ecq, ecp, q);
 181
 182         /*
 183          * For each line...  The semantics of global matching are that we first
 184          * have to decide which lines are going to get passed to the command,
 185          * and then pass them to the command, ignoring other changes.  There's
 186          * really no way to do this in a single pass, since arbitrary line
 187          * creation, deletion and movement can be done in the ex command.  For
 188          * example, a good vi clone test is ":g/X/mo.-3", or "g/X/.,.+1d".
 189          * What we do is create linked list of lines that are tracked through
 190          * each ex command.  There's a callback routine which the DB interface
 191          * routines call when a line is created or deleted.  This doesn't help
 192          * the layering much.
 193          */
 194         btype = BUSY_ON;
 195         cnt = INTERRUPT_CHECK;
 196         for (start = cmdp->addr1.lno,
 197             end = cmdp->addr2.lno; start <= end; ++start) {
 198                 if (cnt-- == 0) {
 199                         if (INTERRUPTED(sp)) {
 200                                 LIST_REMOVE(ecp, q);
 201                                 free(ecp->cp);
 202                                 free(ecp);
 203                                 break;
 204                         }
 205                         search_busy(sp, btype);
 206                         btype = BUSY_UPDATE;
 207                         cnt = INTERRUPT_CHECK;
 208                 }
 209                 if (db_get(sp, start, DBG_FATAL, &dbp, &len))
 210                         return (1);
 211                 match[0].rm_so = 0;
 212                 match[0].rm_eo = len;
 213                 switch (eval =
 214                     regexec(&sp->re_c, dbp, 0, match, REG_STARTEND)) {
 215                 case 0:
 216                         if (cmd == V)
 217                                 continue;
 218                         break;
 219                 case REG_NOMATCH:
 220                         if (cmd == GLOBAL)
 221                                 continue;
 222                         break;
 223                 default:
 224                         re_error(sp, eval, &sp->re_c);
 225                         break;
 226                 }
 227
 228                 /* If follows the last entry, extend the last entry's range. */
 229                 if ((rp = TAILQ_LAST(&ecp->rq, _rh)) != NULL &&
 230                     rp->stop == start - 1) {
 231                         ++rp->stop;
 232                         continue;
 233                 }
 234
 235                 /* Allocate a new range, and append it to the list. */
 236                 CALLOC(sp, rp, RANGE *, 1, sizeof(RANGE));
 237                 if (rp == NULL)
 238                         return (1);
 239                 rp->start = rp->stop = start;
 240                 TAILQ_INSERT_TAIL(&ecp->rq, rp, q);
 241         }
 242         search_busy(sp, BUSY_OFF);
 243         return (0);
 244 alloc_err:
 245         free(ecp);
 246         return 1;
 247 }
 248
 249 /*
 250  * ex_g_insdel --
 251  *      Update the ranges based on an insertion or deletion.
 252  *
 253  * PUBLIC: int ex_g_insdel __P((SCR *, lnop_t, db_recno_t));
 254  */
 255 int
 256 ex_g_insdel(SCR *sp, lnop_t op, db_recno_t lno)
 257 {
 258         EXCMD *ecp;
 259         RANGE *nrp, *rp;
 260
 261         /* All insert/append operations are done as inserts. */
 262         if (op == LINE_APPEND)
 263                 abort();
 264
 265         if (op == LINE_RESET)
 266                 return (0);
 267
 268         LIST_FOREACH(ecp, &sp->wp->ecq, q) {
 269                 if (!FL_ISSET(ecp->agv_flags, AGV_AT | AGV_GLOBAL | AGV_V))
 270                         continue;
 271                 TAILQ_FOREACH_SAFE(rp, &ecp->rq, q, nrp) {
 272                         /* If range less than the line, ignore it. */
 273                         if (rp->stop < lno)
 274                                 continue;
 275
 276                         /*
 277                          * If range greater than the line, decrement or
 278                          * increment the range.
 279                          */
 280                         if (rp->start > lno) {
 281                                 if (op == LINE_DELETE) {
 282                                         --rp->start;
 283                                         --rp->stop;
 284                                 } else {
 285                                         ++rp->start;
 286                                         ++rp->stop;
 287                                 }
 288                                 continue;
 289                         }
 290
 291                         /*
 292                          * Lno is inside the range, decrement the end point
 293                          * for deletion, and split the range for insertion.
 294                          * In the latter case, since we're inserting a new
 295                          * element, neither range can be exhausted.
 296                          */
 297                         if (op == LINE_DELETE) {
 298                                 if (rp->start > --rp->stop) {
 299                                         TAILQ_REMOVE(&ecp->rq, rp, q);
 300                                         free(rp);
 301                                 }
 302                         } else {
 303                                 CALLOC_RET(sp, nrp, RANGE *, 1, sizeof(RANGE));
 304                                 nrp->start = lno + 1;
 305                                 nrp->stop = rp->stop + 1;
 306                                 rp->stop = lno - 1;
 307                                 TAILQ_INSERT_AFTER(&ecp->rq, rp, nrp, q);
 308                         }
 309                 }
 310
 311                 /*
 312                  * If the command deleted/inserted lines, the cursor moves to
 313                  * the line after the deleted/inserted line.
 314                  */
 315                 ecp->range_lno = lno;
 316         }
 317         return (0);
 318 }