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

   1 /*      $NetBSD: ex_write.c,v 1.2 2013/11/22 15:52:05 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_write.c,v 10.38 2001/06/25 15:19:22 skimo Exp  (Berkeley) Date: 2001/06/25 15:19:22 ";
  15 #endif /* not lint */
  16
  17 #include <sys/types.h>
  18 #include <sys/queue.h>
  19 #include <sys/stat.h>
  20
  21 #include <bitstring.h>
  22 #include <ctype.h>
  23 #include <errno.h>
  24 #include <fcntl.h>
  25 #include <limits.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <unistd.h>
  30
  31 #include "../common/common.h"
  32
  33 enum which {WN, WQ, WRITE, XIT};
  34 static int exwr __P((SCR *, EXCMD *, enum which));
  35
  36 /*
  37  * ex_wn --     :wn[!] [>>] [file]
  38  *      Write to a file and switch to the next one.
  39  *
  40  * PUBLIC: int ex_wn __P((SCR *, EXCMD *));
  41  */
  42 int
  43 ex_wn(SCR *sp, EXCMD *cmdp)
  44 {
  45         if (exwr(sp, cmdp, WN))
  46                 return (1);
  47         if (file_m3(sp, 0))
  48                 return (1);
  49
  50         /* The file name isn't a new file to edit. */
  51         cmdp->argc = 0;
  52
  53         return (ex_next(sp, cmdp));
  54 }
  55
  56 /*
  57  * ex_wq --     :wq[!] [>>] [file]
  58  *      Write to a file and quit.
  59  *
  60  * PUBLIC: int ex_wq __P((SCR *, EXCMD *));
  61  */
  62 int
  63 ex_wq(SCR *sp, EXCMD *cmdp)
  64 {
  65         int force;
  66
  67         if (exwr(sp, cmdp, WQ))
  68                 return (1);
  69         if (file_m3(sp, 0))
  70                 return (1);
  71
  72         force = FL_ISSET(cmdp->iflags, E_C_FORCE);
  73
  74         if (ex_ncheck(sp, force))
  75                 return (1);
  76
  77         F_SET(sp, force ? SC_EXIT_FORCE : SC_EXIT);
  78         return (0);
  79 }
  80
  81 /*
  82  * ex_write --  :write[!] [>>] [file]
  83  *              :write [!] [cmd]
  84  *      Write to a file.
  85  *
  86  * PUBLIC: int ex_write __P((SCR *, EXCMD *));
  87  */
  88 int
  89 ex_write(SCR *sp, EXCMD *cmdp)
  90 {
  91         return (exwr(sp, cmdp, WRITE));
  92 }
  93
  94
  95 /*
  96  * ex_xit -- :x[it]! [file]
  97  *      Write out any modifications and quit.
  98  *
  99  * PUBLIC: int ex_xit __P((SCR *, EXCMD *));
 100  */
 101 int
 102 ex_xit(SCR *sp, EXCMD *cmdp)
 103 {
 104         int force;
 105
 106         NEEDFILE(sp, cmdp);
 107
 108         if (F_ISSET(sp->ep, F_MODIFIED) && exwr(sp, cmdp, XIT))
 109                 return (1);
 110         if (file_m3(sp, 0))
 111                 return (1);
 112
 113         force = FL_ISSET(cmdp->iflags, E_C_FORCE);
 114
 115         if (ex_ncheck(sp, force))
 116                 return (1);
 117
 118         F_SET(sp, force ? SC_EXIT_FORCE : SC_EXIT);
 119         return (0);
 120 }
 121
 122 /*
 123  * exwr --
 124  *      The guts of the ex write commands.
 125  */
 126 static int
 127 exwr(SCR *sp, EXCMD *cmdp, enum which cmd)
 128 {
 129         MARK rm;
 130         int flags;
 131         char *name;
 132         CHAR_T *p = NULL;
 133         size_t nlen;
 134         const char *n;
 135         int rc;
 136         EX_PRIVATE *exp;
 137
 138         NEEDFILE(sp, cmdp);
 139
 140         /* All write commands can have an associated '!'. */
 141         LF_INIT(FS_POSSIBLE);
 142         if (FL_ISSET(cmdp->iflags, E_C_FORCE))
 143                 LF_SET(FS_FORCE);
 144
 145         /* Skip any leading whitespace. */
 146         if (cmdp->argc != 0)
 147                 for (p = cmdp->argv[0]->bp; *p != '\0' && ISBLANK((UCHAR_T)*p); ++p);
 148
 149         /* If "write !" it's a pipe to a utility. */
 150         if (cmdp->argc != 0 && cmd == WRITE && *p == '!') {
 151                 /* Secure means no shell access. */
 152                 if (O_ISSET(sp, O_SECURE)) {
 153                         ex_wemsg(sp, cmdp->cmd->name, EXM_SECURE_F);
 154                         return (1);
 155                 }
 156
 157                 /* Expand the argument. */
 158                 for (++p; *p && ISBLANK((UCHAR_T)*p); ++p);
 159                 if (*p == '\0') {
 160                         ex_emsg(sp, cmdp->cmd->usage, EXM_USAGE);
 161                         return (1);
 162                 }
 163                 if (argv_exp1(sp, cmdp, p, STRLEN(p), 1))
 164                         return (1);
 165
 166                 /* Set the last bang command */
 167                 exp = EXP(sp);
 168                 free(exp->lastbcomm);
 169                 exp->lastbcomm = v_wstrdup(sp, cmdp->argv[1]->bp,
 170                     cmdp->argv[1]->len);
 171
 172                 /*
 173                  * Historically, vi waited after a write filter even if there
 174                  * wasn't any output from the command.  People complained when
 175                  * nvi waited only if there was output, wanting the visual cue
 176                  * that the program hadn't written anything.
 177                  */
 178                 F_SET(sp, SC_EX_WAIT_YES);
 179
 180                 /*
 181                  * !!!
 182                  * Ignore the return cursor position, the cursor doesn't
 183                  * move.
 184                  */
 185                 if (ex_filter(sp, cmdp, &cmdp->addr1,
 186                     &cmdp->addr2, &rm, cmdp->argv[1]->bp, FILTER_WRITE))
 187                         return (1);
 188
 189                 /* Ex terminates with a bang, even if the command fails. */
 190                 if (!F_ISSET(sp, SC_VI) && !F_ISSET(sp, SC_EX_SILENT))
 191                         (void)ex_puts(sp, "!\n");
 192
 193                 return (0);
 194         }
 195
 196         /* Set the FS_ALL flag if we're writing the entire file. */
 197         if (cmdp->addr1.lno <= 1 && !db_exist(sp, cmdp->addr2.lno + 1))
 198                 LF_SET(FS_ALL);
 199
 200         /* If "write >>" it's an append to a file. */
 201         if (cmdp->argc != 0 && cmd != XIT && p[0] == '>' && p[1] == '>') {
 202                 LF_SET(FS_APPEND);
 203
 204                 /* Skip ">>" and whitespace. */
 205                 for (p += 2; *p && ISBLANK((UCHAR_T)*p); ++p);
 206         }
 207
 208         /* If no other arguments, just write the file back. */
 209         if (cmdp->argc == 0 || *p == '\0')
 210                 return (file_write(sp,
 211                     &cmdp->addr1, &cmdp->addr2, NULL, flags));
 212
 213         /* Build an argv so we get an argument count and file expansion. */
 214         if (argv_exp2(sp, cmdp, p, STRLEN(p)))
 215                 return (1);
 216
 217         /*
 218          *  0 args: impossible.
 219          *  1 args: impossible (I hope).
 220          *  2 args: read it.
 221          * >2 args: object, too many args.
 222          *
 223          * The 1 args case depends on the argv_sexp() function refusing
 224          * to return success without at least one non-blank character.
 225          */
 226         switch (cmdp->argc) {
 227         case 0:
 228         case 1:
 229                 abort();
 230                 /* NOTREACHED */
 231         case 2:
 232                 INT2CHAR(sp, cmdp->argv[1]->bp, cmdp->argv[1]->len+1,
 233                          n, nlen);
 234                 name = v_strdup(sp, n, nlen - 1);
 235
 236                 /*
 237                  * !!!
 238                  * Historically, the read and write commands renamed
 239                  * "unnamed" files, or, if the file had a name, set
 240                  * the alternate file name.
 241                  */
 242                 if (F_ISSET(sp->frp, FR_TMPFILE) &&
 243                     !F_ISSET(sp->frp, FR_EXNAMED)) {
 244                         char *q;
 245                         if ((q = v_strdup(sp, name, nlen - 1)) != NULL) {
 246                                 free(sp->frp->name);
 247                                 sp->frp->name = q;
 248                         }
 249                         /*
 250                          * The file has a real name, it's no longer a
 251                          * temporary, clear the temporary file flags.
 252                          *
 253                          * !!!
 254                          * If we're writing the whole file, FR_NAMECHANGE
 255                          * will be cleared by the write routine -- this is
 256                          * historic practice.
 257                          */
 258                         F_CLR(sp->frp, FR_TMPEXIT | FR_TMPFILE);
 259                         F_SET(sp->frp, FR_NAMECHANGE | FR_EXNAMED);
 260
 261                         /* Notify the screen. */
 262                         (void)sp->gp->scr_rename(sp, sp->frp->name, 1);
 263                 } else
 264                         set_alt_name(sp, name);
 265                 break;
 266         default:
 267                 INT2CHAR(sp, p, STRLEN(p) + 1, n, nlen);
 268                 ex_emsg(sp, n, EXM_FILECOUNT);
 269                 return (1);
 270         }
 271
 272         rc = file_write(sp, &cmdp->addr1, &cmdp->addr2, name, flags);
 273
 274         free(name);
 275
 276         return rc;
 277 }
 278
 279 /*
 280  * ex_writefp --
 281  *      Write a range of lines to a FILE *.
 282  *
 283  * PUBLIC: int ex_writefp __P((SCR *,
 284  * PUBLIC:    const char *, FILE *, MARK *, MARK *, u_long *, u_long *, int));
 285  */
 286 int
 287 ex_writefp(SCR *sp, const char *name, FILE *fp, MARK *fm, MARK *tm, u_long *nlno, u_long *nch, int silent)
 288 {
 289         struct stat sb;
 290         GS *gp;
 291         u_long ccnt;                    /* XXX: can't print off_t portably. */
 292         db_recno_t fline, tline, lcnt;
 293         size_t len;
 294         int rval;
 295         const char *msg;
 296         CHAR_T *p;
 297         const char *f;
 298         size_t flen;
 299
 300         gp = sp->gp;
 301         fline = fm->lno;
 302         tline = tm->lno;
 303
 304         if (nlno != NULL) {
 305                 *nch = 0;
 306                 *nlno = 0;
 307         }
 308
 309         /*
 310          * The vi filter code has multiple processes running simultaneously,
 311          * and one of them calls ex_writefp().  The "unsafe" function calls
 312          * in this code are to db_get() and msgq().  Db_get() is safe, see
 313          * the comment in ex_filter.c:ex_filter() for details.  We don't call
 314          * msgq if the multiple process bit in the EXF is set.
 315          *
 316          * !!!
 317          * Historic vi permitted files of 0 length to be written.  However,
 318          * since the way vi got around dealing with "empty" files was to
 319          * always have a line in the file no matter what, it wrote them as
 320          * files of a single, empty line.  We write empty files.
 321          *
 322          * "Alex, I'll take vi trivia for $1000."
 323          */
 324         ccnt = 0;
 325         lcnt = 0;
 326         msg = "253|Writing...";
 327         if (tline != 0)
 328                 for (; fline <= tline; ++fline, ++lcnt) {
 329                         /* Caller has to provide any interrupt message. */
 330                         if ((lcnt + 1) % INTERRUPT_CHECK == 0) {
 331                                 if (INTERRUPTED(sp))
 332                                         break;
 333                                 if (!silent) {
 334                                         gp->scr_busy(sp, msg, msg == NULL ?
 335                                             BUSY_UPDATE : BUSY_ON);
 336                                         msg = NULL;
 337                                 }
 338                         }
 339                         if (db_get(sp, fline, DBG_FATAL, &p, &len))
 340                                 goto err;
 341                         INT2FILE(sp, p, len, f, flen);
 342                         if (fwrite(f, 1, flen, fp) != flen)
 343                                 goto err;
 344                         ccnt += len;
 345                         if (putc('\n', fp) != '\n')
 346                                 break;
 347                         ++ccnt;
 348                 }
 349
 350         if (fflush(fp))
 351                 goto err;
 352         /*
 353          * XXX
 354          * I don't trust NFS -- check to make sure that we're talking to
 355          * a regular file and sync so that NFS is forced to flush.
 356          */
 357         if (!fstat(fileno(fp), &sb) &&
 358             S_ISREG(sb.st_mode) && fsync(fileno(fp)))
 359                 goto err;
 360
 361         if (fclose(fp))
 362                 goto err;
 363
 364         rval = 0;
 365         if (0) {
 366 err:            if (!F_ISSET(sp->ep, F_MULTILOCK))
 367                         msgq_str(sp, M_SYSERR, name, "%s");
 368                 (void)fclose(fp);
 369                 rval = 1;
 370         }
 371
 372         if (!silent)
 373                 gp->scr_busy(sp, NULL, BUSY_OFF);
 374
 375         /* Report the possibly partial transfer. */
 376         if (nlno != NULL) {
 377                 *nch = ccnt;
 378                 *nlno = lcnt;
 379         }
 380         return (rval);
 381 }