contrib/nvi2/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 10.43 2015/04/03 15:18:45 zy Exp $";
  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(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(SCR *, EXCMD *);
  40  */
  41 int
  42 ex_wn(SCR *sp, EXCMD *cmdp)
  43 {
  44         if (exwr(sp, cmdp, WN))
  45                 return (1);
  46         if (file_m3(sp, 0))
  47                 return (1);
  48
  49         /* The file name isn't a new file to edit. */
  50         cmdp->argc = 0;
  51
  52         return (ex_next(sp, cmdp));
  53 }
  54
  55 /*
  56  * ex_wq --     :wq[!] [>>] [file]
  57  *      Write to a file and quit.
  58  *
  59  * PUBLIC: int ex_wq(SCR *, EXCMD *);
  60  */
  61 int
  62 ex_wq(SCR *sp, EXCMD *cmdp)
  63 {
  64         int force;
  65
  66         if (exwr(sp, cmdp, WQ))
  67                 return (1);
  68         if (file_m3(sp, 0))
  69                 return (1);
  70
  71         force = FL_ISSET(cmdp->iflags, E_C_FORCE);
  72
  73         if (ex_ncheck(sp, force))
  74                 return (1);
  75
  76         F_SET(sp, force ? SC_EXIT_FORCE : SC_EXIT);
  77         return (0);
  78 }
  79
  80 /*
  81  * ex_write --  :write[!] [>>] [file]
  82  *              :write [!] [cmd]
  83  *      Write to a file.
  84  *
  85  * PUBLIC: int ex_write(SCR *, EXCMD *);
  86  */
  87 int
  88 ex_write(SCR *sp, EXCMD *cmdp)
  89 {
  90         return (exwr(sp, cmdp, WRITE));
  91 }
  92
  93
  94 /*
  95  * ex_xit -- :x[it]! [file]
  96  *      Write out any modifications and quit.
  97  *
  98  * PUBLIC: int ex_xit(SCR *, EXCMD *);
  99  */
 100 int
 101 ex_xit(SCR *sp, EXCMD *cmdp)
 102 {
 103         int force;
 104
 105         NEEDFILE(sp, cmdp);
 106
 107         if (F_ISSET(sp->ep, F_MODIFIED) && exwr(sp, cmdp, XIT))
 108                 return (1);
 109         if (file_m3(sp, 0))
 110                 return (1);
 111
 112         force = FL_ISSET(cmdp->iflags, E_C_FORCE);
 113
 114         if (ex_ncheck(sp, force))
 115                 return (1);
 116
 117         F_SET(sp, force ? SC_EXIT_FORCE : SC_EXIT);
 118         return (0);
 119 }
 120
 121 /*
 122  * exwr --
 123  *      The guts of the ex write commands.
 124  */
 125 static int
 126 exwr(SCR *sp, EXCMD *cmdp, enum which cmd)
 127 {
 128         MARK rm;
 129         int flags;
 130         char *name;
 131         CHAR_T *p = NULL;
 132         size_t nlen;
 133         char *n;
 134         int rc;
 135         EX_PRIVATE *exp;
 136
 137         NEEDFILE(sp, cmdp);
 138
 139         /* All write commands can have an associated '!'. */
 140         LF_INIT(FS_POSSIBLE);
 141         if (FL_ISSET(cmdp->iflags, E_C_FORCE))
 142                 LF_SET(FS_FORCE);
 143
 144         /* Skip any leading whitespace. */
 145         if (cmdp->argc != 0)
 146                 for (p = cmdp->argv[0]->bp; *p != '\0' && cmdskip(*p); ++p);
 147
 148         /* If "write !" it's a pipe to a utility. */
 149         if (cmdp->argc != 0 && cmd == WRITE && *p == '!') {
 150                 /* Secure means no shell access. */
 151                 if (O_ISSET(sp, O_SECURE)) {
 152                         ex_wemsg(sp, cmdp->cmd->name, EXM_SECURE_F);
 153                         return (1);
 154                 }
 155
 156                 /* Expand the argument. */
 157                 for (++p; *p && cmdskip(*p); ++p);
 158                 if (*p == '\0') {
 159                         ex_emsg(sp, cmdp->cmd->usage, EXM_USAGE);
 160                         return (1);
 161                 }
 162                 if (argv_exp1(sp, cmdp, p, STRLEN(p), 1))
 163                         return (1);
 164
 165                 /* Set the last bang command */
 166                 exp = EXP(sp);
 167                 free(exp->lastbcomm);
 168                 exp->lastbcomm = v_wstrdup(sp, cmdp->argv[1]->bp,
 169                     cmdp->argv[1]->len);
 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 && cmdskip(*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                 INT2CHAR(sp, cmdp->argv[1]->bp, cmdp->argv[1]->len+1,
 232                          n, nlen);
 233                 name = v_strdup(sp, n, nlen - 1);
 234
 235                 /*
 236                  * !!!
 237                  * Historically, the read and write commands renamed
 238                  * "unnamed" files, or, if the file had a name, set
 239                  * the alternate file name.
 240                  */
 241                 if (F_ISSET(sp->frp, FR_TMPFILE) &&
 242                     !F_ISSET(sp->frp, FR_EXNAMED)) {
 243                         if ((n = v_strdup(sp, name, nlen - 1)) != NULL) {
 244                                 free(sp->frp->name);
 245                                 sp->frp->name = n;
 246                         }
 247                         /*
 248                          * The file has a real name, it's no longer a
 249                          * temporary, clear the temporary file flags.
 250                          *
 251                          * !!!
 252                          * If we're writing the whole file, FR_NAMECHANGE
 253                          * will be cleared by the write routine -- this is
 254                          * historic practice.
 255                          */
 256                         F_CLR(sp->frp, FR_TMPEXIT | FR_TMPFILE);
 257                         F_SET(sp->frp, FR_NAMECHANGE | FR_EXNAMED);
 258
 259                         /* Notify the screen. */
 260                         (void)sp->gp->scr_rename(sp, sp->frp->name, 1);
 261                 } else
 262                         set_alt_name(sp, name);
 263                 break;
 264         default:
 265                 INT2CHAR(sp, p, STRLEN(p) + 1, n, nlen);
 266                 ex_emsg(sp, n, EXM_FILECOUNT);
 267                 return (1);
 268         }
 269
 270         rc = file_write(sp, &cmdp->addr1, &cmdp->addr2, name, flags);
 271
 272         free(name);
 273
 274         return rc;
 275 }
 276
 277 /*
 278  * ex_writefp --
 279  *      Write a range of lines to a FILE *.
 280  *
 281  * PUBLIC: int ex_writefp(SCR *,
 282  * PUBLIC:    char *, FILE *, MARK *, MARK *, u_long *, u_long *, int);
 283  */
 284 int
 285 ex_writefp(SCR *sp, char *name, FILE *fp, MARK *fm, MARK *tm, u_long *nlno, u_long *nch, 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_rget(sp, fline, &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 }