contrib/nvi/ex/ex_read.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[] = "@(#)ex_read.c     10.38 (Berkeley) 8/12/96";
  14 #endif /* not lint */
  15
  16 #include <sys/types.h>
  17 #include <sys/queue.h>
  18 #include <sys/stat.h>
  19 #include <sys/time.h>
  20
  21 #include <bitstring.h>
  22 #include <ctype.h>
  23 #include <errno.h>
  24 #include <limits.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28
  29 #include "../common/common.h"
  30 #include "../vi/vi.h"
  31
  32 /*
  33  * ex_read --   :read [file]
  34  *              :read [!cmd]
  35  *      Read from a file or utility.
  36  *
  37  * !!!
  38  * Historical vi wouldn't undo a filter read, for no apparent reason.
  39  *
  40  * PUBLIC: int ex_read __P((SCR *, EXCMD *));
  41  */
  42 int
  43 ex_read(sp, cmdp)
  44         SCR *sp;
  45         EXCMD *cmdp;
  46 {
  47         enum { R_ARG, R_EXPANDARG, R_FILTER } which;
  48         struct stat sb;
  49         CHAR_T *arg, *name;
  50         EX_PRIVATE *exp;
  51         FILE *fp;
  52         FREF *frp;
  53         GS *gp;
  54         MARK rm;
  55         recno_t nlines;
  56         size_t arglen;
  57         int argc, rval;
  58         char *p;
  59
  60         gp = sp->gp;
  61
  62         /*
  63          * 0 args: read the current pathname.
  64          * 1 args: check for "read !arg".
  65          */
  66         switch (cmdp->argc) {
  67         case 0:
  68                 which = R_ARG;
  69                 break;
  70         case 1:
  71                 arg = cmdp->argv[0]->bp;
  72                 arglen = cmdp->argv[0]->len;
  73                 if (*arg == '!') {
  74                         ++arg;
  75                         --arglen;
  76                         which = R_FILTER;
  77
  78                         /* Secure means no shell access. */
  79                         if (O_ISSET(sp, O_SECURE)) {
  80                                 ex_emsg(sp, cmdp->cmd->name, EXM_SECURE_F);
  81                                 return (1);
  82                         }
  83                 } else
  84                         which = R_EXPANDARG;
  85                 break;
  86         default:
  87                 abort();
  88                 /* NOTREACHED */
  89         }
  90
  91         /* Load a temporary file if no file being edited. */
  92         if (sp->ep == NULL) {
  93                 if ((frp = file_add(sp, NULL)) == NULL)
  94                         return (1);
  95                 if (file_init(sp, frp, NULL, 0))
  96                         return (1);
  97         }
  98
  99         switch (which) {
 100         case R_FILTER:
 101                 /*
 102                  * File name and bang expand the user's argument.  If
 103                  * we don't get an additional argument, it's illegal.
 104                  */
 105                 argc = cmdp->argc;
 106                 if (argv_exp1(sp, cmdp, arg, arglen, 1))
 107                         return (1);
 108                 if (argc == cmdp->argc) {
 109                         ex_emsg(sp, cmdp->cmd->usage, EXM_USAGE);
 110                         return (1);
 111                 }
 112                 argc = cmdp->argc - 1;
 113
 114                 /* Set the last bang command. */
 115                 exp = EXP(sp);
 116                 if (exp->lastbcomm != NULL)
 117                         free(exp->lastbcomm);
 118                 if ((exp->lastbcomm =
 119                     strdup(cmdp->argv[argc]->bp)) == NULL) {
 120                         msgq(sp, M_SYSERR, NULL);
 121                         return (1);
 122                 }
 123
 124                 /*
 125                  * Vi redisplayed the user's argument if it changed, ex
 126                  * always displayed a !, plus the user's argument if it
 127                  * changed.
 128                  */
 129                 if (F_ISSET(sp, SC_VI)) {
 130                         if (F_ISSET(cmdp, E_MODIFY))
 131                                 (void)vs_update(sp, "!", cmdp->argv[argc]->bp);
 132                 } else {
 133                         if (F_ISSET(cmdp, E_MODIFY))
 134                                 (void)ex_printf(sp,
 135                                     "!%s\n", cmdp->argv[argc]->bp);
 136                         else
 137                                 (void)ex_puts(sp, "!\n");
 138                         (void)ex_fflush(sp);
 139                 }
 140
 141                 /*
 142                  * Historically, filter reads as the first ex command didn't
 143                  * wait for the user. If SC_SCR_EXWROTE not already set, set
 144                  * the don't-wait flag.
 145                  */
 146                 if (!F_ISSET(sp, SC_SCR_EXWROTE))
 147                         F_SET(sp, SC_EX_WAIT_NO);
 148
 149                 /*
 150                  * Switch into ex canonical mode.  The reason to restore the
 151                  * original terminal modes for read filters is so that users
 152                  * can do things like ":r! cat /dev/tty".
 153                  *
 154                  * !!!
 155                  * We do not output an extra <newline>, so that we don't touch
 156                  * the screen on a normal read.
 157                  */
 158                 if (F_ISSET(sp, SC_VI)) {
 159                         if (gp->scr_screen(sp, SC_EX)) {
 160                                 ex_emsg(sp, cmdp->cmd->name, EXM_NOCANON_F);
 161                                 return (1);
 162                         }
 163                         /*
 164                          * !!!
 165                          * Historically, the read command doesn't switch to
 166                          * the alternate X11 xterm screen, if doing a filter
 167                          * read -- don't set SA_ALTERNATE.
 168                          */
 169                         F_SET(sp, SC_SCR_EX | SC_SCR_EXWROTE);
 170                 }
 171
 172                 if (ex_filter(sp, cmdp, &cmdp->addr1,
 173                     NULL, &rm, cmdp->argv[argc]->bp, FILTER_READ))
 174                         return (1);
 175
 176                 /* The filter version of read set the autoprint flag. */
 177                 F_SET(cmdp, E_AUTOPRINT);
 178
 179                 /*
 180                  * If in vi mode, move to the first nonblank.  Might have
 181                  * switched into ex mode, so saved the original SC_VI value.
 182                  */
 183                 sp->lno = rm.lno;
 184                 if (F_ISSET(sp, SC_VI)) {
 185                         sp->cno = 0;
 186                         (void)nonblank(sp, sp->lno, &sp->cno);
 187                 }
 188                 return (0);
 189         case R_ARG:
 190                 name = sp->frp->name;
 191                 break;
 192         case R_EXPANDARG:
 193                 if (argv_exp2(sp, cmdp, arg, arglen))
 194                         return (1);
 195                 /*
 196                  *  0 args: impossible.
 197                  *  1 args: impossible (I hope).
 198                  *  2 args: read it.
 199                  * >2 args: object, too many args.
 200                  *
 201                  * The 1 args case depends on the argv_sexp() function refusing
 202                  * to return success without at least one non-blank character.
 203                  */
 204                 switch (cmdp->argc) {
 205                 case 0:
 206                 case 1:
 207                         abort();
 208                         /* NOTREACHED */
 209                 case 2:
 210                         name = cmdp->argv[1]->bp;
 211                         /*
 212                          * !!!
 213                          * Historically, the read and write commands renamed
 214                          * "unnamed" files, or, if the file had a name, set
 215                          * the alternate file name.
 216                          */
 217                         if (F_ISSET(sp->frp, FR_TMPFILE) &&
 218                             !F_ISSET(sp->frp, FR_EXNAMED)) {
 219                                 if ((p = v_strdup(sp, cmdp->argv[1]->bp,
 220                                     cmdp->argv[1]->len)) != NULL) {
 221                                         free(sp->frp->name);
 222                                         sp->frp->name = p;
 223                                 }
 224                                 /*
 225                                  * The file has a real name, it's no longer a
 226                                  * temporary, clear the temporary file flags.
 227                                  */
 228                                 F_CLR(sp->frp, FR_TMPEXIT | FR_TMPFILE);
 229                                 F_SET(sp->frp, FR_NAMECHANGE | FR_EXNAMED);
 230
 231                                 /* Notify the screen. */
 232                                 (void)sp->gp->scr_rename(sp, sp->frp->name, 1);
 233                         } else
 234                                 set_alt_name(sp, name);
 235                         break;
 236                 default:
 237                         ex_emsg(sp, cmdp->argv[0]->bp, EXM_FILECOUNT);
 238                         return (1);
 239
 240                 }
 241                 break;
 242         }
 243
 244         /*
 245          * !!!
 246          * Historically, vi did not permit reads from non-regular files, nor
 247          * did it distinguish between "read !" and "read!", so there was no
 248          * way to "force" it.  We permit reading from named pipes too, since
 249          * they didn't exist when the original implementation of vi was done
 250          * and they seem a reasonable addition.
 251          */
 252         if ((fp = fopen(name, "r")) == NULL || fstat(fileno(fp), &sb)) {
 253                 msgq_str(sp, M_SYSERR, name, "%s");
 254                 return (1);
 255         }
 256         if (!S_ISFIFO(sb.st_mode) && !S_ISREG(sb.st_mode)) {
 257                 (void)fclose(fp);
 258                 msgq(sp, M_ERR,
 259                     "145|Only regular files and named pipes may be read");
 260                 return (1);
 261         }
 262
 263         /* Try and get a lock. */
 264         if (file_lock(sp, NULL, NULL, fileno(fp), 0) == LOCK_UNAVAIL)
 265                 msgq(sp, M_ERR, "146|%s: read lock was unavailable", name);
 266
 267         rval = ex_readfp(sp, name, fp, &cmdp->addr1, &nlines, 0);
 268
 269         /*
 270          * In vi, set the cursor to the first line read in, if anything read
 271          * in, otherwise, the address.  (Historic vi set it to the line after
 272          * the address regardless, but since that line may not exist we don't
 273          * bother.)
 274          *
 275          * In ex, set the cursor to the last line read in, if anything read in,
 276          * otherwise, the address.
 277          */
 278         if (F_ISSET(sp, SC_VI)) {
 279                 sp->lno = cmdp->addr1.lno;
 280                 if (nlines)
 281                         ++sp->lno;
 282         } else
 283                 sp->lno = cmdp->addr1.lno + nlines;
 284         return (rval);
 285 }
 286
 287 /*
 288  * ex_readfp --
 289  *      Read lines into the file.
 290  *
 291  * PUBLIC: int ex_readfp __P((SCR *, char *, FILE *, MARK *, recno_t *, int));
 292  */
 293 int
 294 ex_readfp(sp, name, fp, fm, nlinesp, silent)
 295         SCR *sp;
 296         char *name;
 297         FILE *fp;
 298         MARK *fm;
 299         recno_t *nlinesp;
 300         int silent;
 301 {
 302         EX_PRIVATE *exp;
 303         GS *gp;
 304         recno_t lcnt, lno;
 305         size_t len;
 306         u_long ccnt;                    /* XXX: can't print off_t portably. */
 307         int nf, rval;
 308         char *p;
 309
 310         gp = sp->gp;
 311         exp = EXP(sp);
 312
 313         /*
 314          * Add in the lines from the output.  Insertion starts at the line
 315          * following the address.
 316          */
 317         ccnt = 0;
 318         lcnt = 0;
 319         p = "147|Reading...";
 320         for (lno = fm->lno; !ex_getline(sp, fp, &len); ++lno, ++lcnt) {
 321                 if ((lcnt + 1) % INTERRUPT_CHECK == 0) {
 322                         if (INTERRUPTED(sp))
 323                                 break;
 324                         if (!silent) {
 325                                 gp->scr_busy(sp, p,
 326                                     p == NULL ? BUSY_UPDATE : BUSY_ON);
 327                                 p = NULL;
 328                         }
 329                 }
 330                 if (db_append(sp, 1, lno, exp->ibp, len))
 331                         goto err;
 332                 ccnt += len;
 333         }
 334
 335         if (ferror(fp) || fclose(fp))
 336                 goto err;
 337
 338         /* Return the number of lines read in. */
 339         if (nlinesp != NULL)
 340                 *nlinesp = lcnt;
 341
 342         if (!silent) {
 343                 p = msg_print(sp, name, &nf);
 344                 msgq(sp, M_INFO,
 345                     "148|%s: %lu lines, %lu characters", p, lcnt, ccnt);
 346                 if (nf)
 347                         FREE_SPACE(sp, p, 0);
 348         }
 349
 350         rval = 0;
 351         if (0) {
 352 err:            msgq_str(sp, M_SYSERR, name, "%s");
 353                 (void)fclose(fp);
 354                 rval = 1;
 355         }
 356
 357         if (!silent)
 358                 gp->scr_busy(sp, NULL, BUSY_OFF);
 359         return (rval);
 360 }