ex/ex_write.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_write.c,v 10.30 1996/07/12 20:55:27 bostic Exp $ (Berkeley) $Date: 1996/07/12 20:55:27 $";
  14 #endif /* not lint */
  15
  16 #include <sys/types.h>
  17 #include <sys/queue.h>
  18 #include <sys/stat.h>
  19
  20 #include <bitstring.h>
  21 #include <ctype.h>
  22 #include <errno.h>
  23 #include <fcntl.h>
  24 #include <limits.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <unistd.h>
  29
  30 #include "../common/common.h"
  31
  32 enum which {WN, WQ, WRITE, XIT};
  33 static int exwr __P((SCR *, EXCMD *, enum which));
  34
  35 /*
  36  * ex_wn --     :wn[!] [>>] [file]
  37  *      Write to a file and switch to the next one.
  38  *
  39  * PUBLIC: int ex_wn __P((SCR *, EXCMD *));
  40  */
  41 int
  42 ex_wn(sp, cmdp)
  43         SCR *sp;
  44         EXCMD *cmdp;
  45 {
  46         if (exwr(sp, cmdp, WN))
  47                 return (1);
  48         if (file_m3(sp, 0))
  49                 return (1);
  50
  51         /* The file name isn't a new file to edit. */
  52         cmdp->argc = 0;
  53
  54         return (ex_next(sp, cmdp));
  55 }
  56
  57 /*
  58  * ex_wq --     :wq[!] [>>] [file]
  59  *      Write to a file and quit.
  60  *
  61  * PUBLIC: int ex_wq __P((SCR *, EXCMD *));
  62  */
  63 int
  64 ex_wq(sp, cmdp)
  65         SCR *sp;
  66         EXCMD *cmdp;
  67 {
  68         int force;
  69
  70         if (exwr(sp, cmdp, WQ))
  71                 return (1);
  72         if (file_m3(sp, 0))
  73                 return (1);
  74
  75         force = FL_ISSET(cmdp->iflags, E_C_FORCE);
  76
  77         if (ex_ncheck(sp, force))
  78                 return (1);
  79
  80         F_SET(sp, force ? SC_EXIT_FORCE : SC_EXIT);
  81         return (0);
  82 }
  83
  84 /*
  85  * ex_write --  :write[!] [>>] [file]
  86  *              :write [!] [cmd]
  87  *      Write to a file.
  88  *
  89  * PUBLIC: int ex_write __P((SCR *, EXCMD *));
  90  */
  91 int
  92 ex_write(sp, cmdp)
  93         SCR *sp;
  94         EXCMD *cmdp;
  95 {
  96         return (exwr(sp, cmdp, WRITE));
  97 }
  98
  99
 100 /*
 101  * ex_xit -- :x[it]! [file]
 102  *      Write out any modifications and quit.
 103  *
 104  * PUBLIC: int ex_xit __P((SCR *, EXCMD *));
 105  */
 106 int
 107 ex_xit(sp, cmdp)
 108         SCR *sp;
 109         EXCMD *cmdp;
 110 {
 111         int force;
 112
 113         NEEDFILE(sp, cmdp);
 114
 115         if (F_ISSET(sp->ep, F_MODIFIED) && exwr(sp, cmdp, XIT))
 116                 return (1);
 117         if (file_m3(sp, 0))
 118                 return (1);
 119
 120         force = FL_ISSET(cmdp->iflags, E_C_FORCE);
 121
 122         if (ex_ncheck(sp, force))
 123                 return (1);
 124
 125         F_SET(sp, force ? SC_EXIT_FORCE : SC_EXIT);
 126         return (0);
 127 }
 128
 129 /*
 130  * exwr --
 131  *      The guts of the ex write commands.
 132  */
 133 static int
 134 exwr(sp, cmdp, cmd)
 135         SCR *sp;
 136         EXCMD *cmdp;
 137         enum which cmd;
 138 {
 139         MARK rm;
 140         int flags;
 141         char *name, *p;
 142
 143         NEEDFILE(sp, cmdp);
 144
 145         /* All write commands can have an associated '!'. */
 146         LF_INIT(FS_POSSIBLE);
 147         if (FL_ISSET(cmdp->iflags, E_C_FORCE))
 148                 LF_SET(FS_FORCE);
 149
 150         /* Skip any leading whitespace. */
 151         if (cmdp->argc != 0)
 152                 for (p = cmdp->argv[0]->bp; *p != '\0' && isblank(*p); ++p);
 153
 154         /* If "write !" it's a pipe to a utility. */
 155         if (cmdp->argc != 0 && cmd == WRITE && *p == '!') {
 156                 /* Secure means no shell access. */
 157                 if (O_ISSET(sp, O_SECURE)) {
 158                         ex_emsg(sp, cmdp->cmd->name, EXM_SECURE_F);
 159                         return (1);
 160                 }
 161
 162                 /* Expand the argument. */
 163                 for (++p; *p && isblank(*p); ++p);
 164                 if (*p == '\0') {
 165                         ex_emsg(sp, cmdp->cmd->usage, EXM_USAGE);
 166                         return (1);
 167                 }
 168                 if (argv_exp1(sp, cmdp, p, strlen(p), 1))
 169                         return (1);
 170
 171                 /*
 172                  * Historically, vi waited after a write filter even if there
 173                  * wasn't any output from the command.  People complained when
 174                  * nvi waited only if there was output, wanting the visual cue
 175                  * that the program hadn't written anything.
 176                  */
 177                 F_SET(sp, SC_EX_WAIT_YES);
 178
 179                 /*
 180                  * !!!
 181                  * Ignore the return cursor position, the cursor doesn't
 182                  * move.
 183                  */
 184                 if (ex_filter(sp, cmdp, &cmdp->addr1,
 185                     &cmdp->addr2, &rm, cmdp->argv[1]->bp, FILTER_WRITE))
 186                         return (1);
 187
 188                 /* Ex terminates with a bang, even if the command fails. */
 189                 if (!F_ISSET(sp, SC_VI) && !F_ISSET(sp, SC_EX_SILENT))
 190                         (void)ex_puts(sp, "!\n");
 191
 192                 return (0);
 193         }
 194
 195         /* Set the FS_ALL flag if we're writing the entire file. */
 196         if (cmdp->addr1.lno <= 1 && !db_exist(sp, cmdp->addr2.lno + 1))
 197                 LF_SET(FS_ALL);
 198
 199         /* If "write >>" it's an append to a file. */
 200         if (cmdp->argc != 0 && cmd != XIT && p[0] == '>' && p[1] == '>') {
 201                 LF_SET(FS_APPEND);
 202
 203                 /* Skip ">>" and whitespace. */
 204                 for (p += 2; *p && isblank(*p); ++p);
 205         }
 206
 207         /* If no other arguments, just write the file back. */
 208         if (cmdp->argc == 0 || *p == '\0')
 209                 return (file_write(sp,
 210                     &cmdp->addr1, &cmdp->addr2, NULL, flags));
 211
 212         /* Build an argv so we get an argument count and file expansion. */
 213         if (argv_exp2(sp, cmdp, p, strlen(p)))
 214                 return (1);
 215
 216         /*
 217          *  0 args: impossible.
 218          *  1 args: impossible (I hope).
 219          *  2 args: read it.
 220          * >2 args: object, too many args.
 221          *
 222          * The 1 args case depends on the argv_sexp() function refusing
 223          * to return success without at least one non-blank character.
 224          */
 225         switch (cmdp->argc) {
 226         case 0:
 227         case 1:
 228                 abort();
 229                 /* NOTREACHED */
 230         case 2:
 231                 name = cmdp->argv[1]->bp;
 232
 233                 /*
 234                  * !!!
 235                  * Historically, the read and write commands renamed
 236                  * "unnamed" files, or, if the file had a name, set
 237                  * the alternate file name.
 238                  */
 239                 if (F_ISSET(sp->frp, FR_TMPFILE) &&
 240                     !F_ISSET(sp->frp, FR_EXNAMED)) {
 241                         if ((p = v_strdup(sp,
 242                             cmdp->argv[1]->bp, cmdp->argv[1]->len)) != NULL) {
 243                                 free(sp->frp->name);
 244                                 sp->frp->name = p;
 245                         }
 246                         /*
 247                          * The file has a real name, it's no longer a
 248                          * temporary, clear the temporary file flags.
 249                          *
 250                          * !!!
 251                          * If we're writing the whole file, FR_NAMECHANGE
 252                          * will be cleared by the write routine -- this is
 253                          * historic practice.
 254                          */
 255                         F_CLR(sp->frp, FR_TMPEXIT | FR_TMPFILE);
 256                         F_SET(sp->frp, FR_NAMECHANGE | FR_EXNAMED);
 257
 258                         /* Notify the screen. */
 259                         (void)sp->gp->scr_rename(sp, sp->frp->name, 1);
 260                 } else
 261                         set_alt_name(sp, name);
 262                 break;
 263         default:
 264                 ex_emsg(sp, p, EXM_FILECOUNT);
 265                 return (1);
 266         }
 267
 268         return (file_write(sp, &cmdp->addr1, &cmdp->addr2, name, flags));
 269 }
 270
 271 /*
 272  * ex_writefp --
 273  *      Write a range of lines to a FILE *.
 274  *
 275  * PUBLIC: int ex_writefp __P((SCR *,
 276  * PUBLIC:    char *, FILE *, MARK *, MARK *, u_long *, u_long *, int));
 277  */
 278 int
 279 ex_writefp(sp, name, fp, fm, tm, nlno, nch, silent)
 280         SCR *sp;
 281         char *name;
 282         FILE *fp;
 283         MARK *fm, *tm;
 284         u_long *nlno, *nch;
 285         int silent;
 286 {
 287         struct stat sb;
 288         GS *gp;
 289         u_long ccnt;                    /* XXX: can't print off_t portably. */
 290         recno_t fline, tline, lcnt;
 291         size_t len;
 292         int rval;
 293         char *msg, *p;
 294
 295         gp = sp->gp;
 296         fline = fm->lno;
 297         tline = tm->lno;
 298
 299         if (nlno != NULL) {
 300                 *nch = 0;
 301                 *nlno = 0;
 302         }
 303
 304         /*
 305          * The vi filter code has multiple processes running simultaneously,
 306          * and one of them calls ex_writefp().  The "unsafe" function calls
 307          * in this code are to db_get() and msgq().  Db_get() is safe, see
 308          * the comment in ex_filter.c:ex_filter() for details.  We don't call
 309          * msgq if the multiple process bit in the EXF is set.
 310          *
 311          * !!!
 312          * Historic vi permitted files of 0 length to be written.  However,
 313          * since the way vi got around dealing with "empty" files was to
 314          * always have a line in the file no matter what, it wrote them as
 315          * files of a single, empty line.  We write empty files.
 316          *
 317          * "Alex, I'll take vi trivia for $1000."
 318          */
 319         ccnt = 0;
 320         lcnt = 0;
 321         msg = "253|Writing...";
 322         if (tline != 0)
 323                 for (; fline <= tline; ++fline, ++lcnt) {
 324                         /* Caller has to provide any interrupt message. */
 325                         if ((lcnt + 1) % INTERRUPT_CHECK == 0) {
 326                                 if (INTERRUPTED(sp))
 327                                         break;
 328                                 if (!silent) {
 329                                         gp->scr_busy(sp, msg, msg == NULL ?
 330                                             BUSY_UPDATE : BUSY_ON);
 331                                         msg = NULL;
 332                                 }
 333                         }
 334                         if (db_get(sp, fline, DBG_FATAL, &p, &len))
 335                                 goto err;
 336                         if (fwrite(p, 1, len, fp) != len)
 337                                 goto err;
 338                         ccnt += len;
 339                         if (putc('\n', fp) != '\n')
 340                                 break;
 341                         ++ccnt;
 342                 }
 343
 344         if (fflush(fp))
 345                 goto err;
 346         /*
 347          * XXX
 348          * I don't trust NFS -- check to make sure that we're talking to
 349          * a regular file and sync so that NFS is forced to flush.
 350          */
 351         if (!fstat(fileno(fp), &sb) &&
 352             S_ISREG(sb.st_mode) && fsync(fileno(fp)))
 353                 goto err;
 354
 355         if (fclose(fp))
 356                 goto err;
 357
 358         rval = 0;
 359         if (0) {
 360 err:            if (!F_ISSET(sp->ep, F_MULTILOCK))
 361                         msgq_str(sp, M_SYSERR, name, "%s");
 362                 (void)fclose(fp);
 363                 rval = 1;
 364         }
 365
 366         if (!silent)
 367                 gp->scr_busy(sp, NULL, BUSY_OFF);
 368
 369         /* Report the possibly partial transfer. */
 370         if (nlno != NULL) {
 371                 *nch = ccnt;
 372                 *nlno = lcnt;
 373         }
 374         return (rval);
 375 }