contrib/nvi2/ex/ex_global.c

   1 /*-
   2  * Copyright (c) 1992, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  * Copyright (c) 1992, 1993, 1994, 1995, 1996
   5  *      Keith Bostic.  All rights reserved.
   6  *
   7  * See the LICENSE file for redistribution information.
   8  */
   9
  10 #include "config.h"
  11
  12 #ifndef lint
  13 static const char sccsid[] = "$Id: ex_global.c,v 10.32 2011/12/26 23:37:01 zy Exp $";
  14 #endif /* not lint */
  15
  16 #include <sys/types.h>
  17 #include <sys/queue.h>
  18 #include <sys/time.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(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(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(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 abs;
  70         RANGE *rp;
  71         busy_t btype;
  72         recno_t start, end;
  73         regex_t *re;
  74         regmatch_t match[1];
  75         size_t len;
  76         int cnt, delim, eval;
  77         CHAR_T *dbp;
  78
  79         NEEDFILE(sp, cmdp);
  80
  81         if (F_ISSET(sp, SC_EX_GLOBAL)) {
  82                 msgq_wstr(sp, M_ERR, cmdp->cmd->name,
  83         "124|The %s command can't be used as part of a global or v command");
  84                 return (1);
  85         }
  86
  87         /*
  88          * Skip leading white space.  Historic vi allowed any non-alphanumeric
  89          * to serve as the global command delimiter.
  90          */
  91         if (cmdp->argc == 0)
  92                 goto usage;
  93         for (p = cmdp->argv[0]->bp; cmdskip(*p); ++p);
  94         if (!isascii(*p) || *p == '\0' || isalnum(*p) ||
  95             *p == '\\' || *p == '|' || *p == '\n') {
  96 usage:          ex_emsg(sp, cmdp->cmd->usage, EXM_USAGE);
  97                 return (1);
  98         }
  99         delim = *p++;
 100
 101         /*
 102          * Get the pattern string, toss escaped characters.
 103          *
 104          * QUOTING NOTE:
 105          * Only toss an escaped character if it escapes a delimiter.
 106          */
 107         for (ptrn = t = p;;) {
 108                 if (p[0] == '\0' || p[0] == delim) {
 109                         if (p[0] == delim)
 110                                 ++p;
 111                         /*
 112                          * !!!
 113                          * Nul terminate the pattern string -- it's passed
 114                          * to regcomp which doesn't understand anything else.
 115                          */
 116                         *t = '\0';
 117                         break;
 118                 }
 119                 if (p[0] == '\\')
 120                         if (p[1] == delim)
 121                                 ++p;
 122                         else if (p[1] == '\\')
 123                                 *t++ = *p++;
 124                 *t++ = *p++;
 125         }
 126
 127         /* If the pattern string is empty, use the last one. */
 128         if (*ptrn == '\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, RE_C_SEARCH))
 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, RE_C_SEARCH))
 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         re = &sp->re_c;
 152
 153         /* The global commands always set the previous context mark. */
 154         abs.lno = sp->lno;
 155         abs.cno = sp->cno;
 156         if (mark_set(sp, ABSMARK1, &abs, 1))
 157                 return (1);
 158
 159         /* Get an EXCMD structure. */
 160         CALLOC_RET(sp, ecp, EXCMD *, 1, sizeof(EXCMD));
 161         TAILQ_INIT(ecp->rq);
 162
 163         /*
 164          * Get a copy of the command string; the default command is print.
 165          * Don't worry about a set of <blank>s with no command, that will
 166          * default to print in the ex parser.  We need to have two copies
 167          * because the ex parser may step on the command string when it's
 168          * parsing it.
 169          */
 170         if ((len = cmdp->argv[0]->len - (p - cmdp->argv[0]->bp)) == 0) {
 171                 p = L("p");
 172                 len = 1;
 173         }
 174
 175         MALLOC_RET(sp, ecp->cp, CHAR_T *, (len * 2) * sizeof(CHAR_T));
 176         ecp->o_cp = ecp->cp;
 177         ecp->o_clen = len;
 178         MEMCPY(ecp->cp + len, p, len);
 179         ecp->range_lno = OOBLNO;
 180         FL_SET(ecp->agv_flags, cmd == GLOBAL ? AGV_GLOBAL : AGV_V);
 181         SLIST_INSERT_HEAD(sp->gp->ecq, ecp, q);
 182
 183         /*
 184          * For each line...  The semantics of global matching are that we first
 185          * have to decide which lines are going to get passed to the command,
 186          * and then pass them to the command, ignoring other changes.  There's
 187          * really no way to do this in a single pass, since arbitrary line
 188          * creation, deletion and movement can be done in the ex command.  For
 189          * example, a good vi clone test is ":g/X/mo.-3", or "g/X/.,.+1d".
 190          * What we do is create linked list of lines that are tracked through
 191          * each ex command.  There's a callback routine which the DB interface
 192          * routines call when a line is created or deleted.  This doesn't help
 193          * the layering much.
 194          */
 195         btype = BUSY_ON;
 196         cnt = INTERRUPT_CHECK;
 197         for (start = cmdp->addr1.lno,
 198             end = cmdp->addr2.lno; start <= end; ++start) {
 199                 if (cnt-- == 0) {
 200                         if (INTERRUPTED(sp)) {
 201                                 SLIST_REMOVE_HEAD(sp->gp->ecq, q);
 202                                 free(ecp->cp);
 203                                 free(ecp);
 204                                 break;
 205                         }
 206                         search_busy(sp, btype);
 207                         btype = BUSY_UPDATE;
 208                         cnt = INTERRUPT_CHECK;
 209                 }
 210                 if (db_get(sp, start, DBG_FATAL, &dbp, &len))
 211                         return (1);
 212                 match[0].rm_so = 0;
 213                 match[0].rm_eo = len;
 214                 switch (eval =
 215                     regexec(&sp->re_c, dbp, 0, match, REG_STARTEND)) {
 216                 case 0:
 217                         if (cmd == V)
 218                                 continue;
 219                         break;
 220                 case REG_NOMATCH:
 221                         if (cmd == GLOBAL)
 222                                 continue;
 223                         break;
 224                 default:
 225                         re_error(sp, eval, &sp->re_c);
 226                         break;
 227                 }
 228
 229                 /* If follows the last entry, extend the last entry's range. */
 230                 if ((rp = TAILQ_LAST(ecp->rq, _rh)) != NULL &&
 231                     rp->stop == start - 1) {
 232                         ++rp->stop;
 233                         continue;
 234                 }
 235
 236                 /* Allocate a new range, and append it to the list. */
 237                 CALLOC(sp, rp, RANGE *, 1, sizeof(RANGE));
 238                 if (rp == NULL)
 239                         return (1);
 240                 rp->start = rp->stop = start;
 241                 TAILQ_INSERT_TAIL(ecp->rq, rp, q);
 242         }
 243         search_busy(sp, BUSY_OFF);
 244         return (0);
 245 }
 246
 247 /*
 248  * ex_g_insdel --
 249  *      Update the ranges based on an insertion or deletion.
 250  *
 251  * PUBLIC: int ex_g_insdel(SCR *, lnop_t, recno_t);
 252  */
 253 int
 254 ex_g_insdel(SCR *sp, lnop_t op, recno_t lno)
 255 {
 256         EXCMD *ecp;
 257         RANGE *nrp, *rp;
 258
 259         /* All insert/append operations are done as inserts. */
 260         if (op == LINE_APPEND)
 261                 abort();
 262
 263         if (op == LINE_RESET)
 264                 return (0);
 265
 266         SLIST_FOREACH(ecp, sp->gp->ecq, q) {
 267                 if (!FL_ISSET(ecp->agv_flags, AGV_AT | AGV_GLOBAL | AGV_V))
 268                         continue;
 269                 TAILQ_FOREACH_MUTABLE(rp, ecp->rq, q, nrp) {
 270                         /* If range less than the line, ignore it. */
 271                         if (rp->stop < lno)
 272                                 continue;
 273
 274                         /*
 275                          * If range greater than the line, decrement or
 276                          * increment the range.
 277                          */
 278                         if (rp->start > lno) {
 279                                 if (op == LINE_DELETE) {
 280                                         --rp->start;
 281                                         --rp->stop;
 282                                 } else {
 283                                         ++rp->start;
 284                                         ++rp->stop;
 285                                 }
 286                                 continue;
 287                         }
 288
 289                         /*
 290                          * Lno is inside the range, decrement the end point
 291                          * for deletion, and split the range for insertion.
 292                          * In the latter case, since we're inserting a new
 293                          * element, neither range can be exhausted.
 294                          */
 295                         if (op == LINE_DELETE) {
 296                                 if (rp->start > --rp->stop) {
 297                                         TAILQ_REMOVE(ecp->rq, rp, q);
 298                                         free(rp);
 299                                 }
 300                         } else {
 301                                 CALLOC_RET(sp, nrp, RANGE *, 1, sizeof(RANGE));
 302                                 nrp->start = lno + 1;
 303                                 nrp->stop = rp->stop + 1;
 304                                 rp->stop = lno - 1;
 305                                 TAILQ_INSERT_AFTER(ecp->rq, rp, nrp, q);
 306                         }
 307                 }
 308
 309                 /*
 310                  * If the command deleted/inserted lines, the cursor moves to
 311                  * the line after the deleted/inserted line.
 312                  */
 313                 ecp->range_lno = lno;
 314         }
 315         return (0);
 316 }