ex/ex_source.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_source.c,v 10.12 1996/08/10 19:52:02 bostic Exp $ (Berkeley) $Date: 1996/08/10 19:52:02 $";
  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 <errno.h>
  22 #include <fcntl.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 /*
  32  * ex_source -- :source file
  33  *      Execute ex commands from a file.
  34  *
  35  * PUBLIC: int ex_source __P((SCR *, EXCMD *));
  36  */
  37 int
  38 ex_source(sp, cmdp)
  39         SCR *sp;
  40         EXCMD *cmdp;
  41 {
  42         struct stat sb;
  43         int fd, len;
  44         char *bp, *name;
  45
  46         name = cmdp->argv[0]->bp;
  47         if ((fd = open(name, O_RDONLY, 0)) < 0 || fstat(fd, &sb))
  48                 goto err;
  49
  50         /*
  51          * XXX
  52          * I'd like to test to see if the file is too large to malloc.  Since
  53          * we don't know what size or type off_t's or size_t's are, what the
  54          * largest unsigned integral type is, or what random insanity the local
  55          * C compiler will perpetrate, doing the comparison in a portable way
  56          * is flatly impossible.  So, put an fairly unreasonable limit on it,
  57          * I don't want to be dropping core here.
  58          */
  59 #define MEGABYTE        1048576
  60         if (sb.st_size > MEGABYTE) {
  61                 errno = ENOMEM;
  62                 goto err;
  63         }
  64
  65         MALLOC(sp, bp, char *, (size_t)sb.st_size + 1);
  66         if (bp == NULL) {
  67                 (void)close(fd);
  68                 return (1);
  69         }
  70         bp[sb.st_size] = '\0';
  71
  72         /* Read the file into memory. */
  73         len = read(fd, bp, (int)sb.st_size);
  74         (void)close(fd);
  75         if (len == -1 || len != sb.st_size) {
  76                 if (len != sb.st_size)
  77                         errno = EIO;
  78                 free(bp);
  79 err:            msgq_str(sp, M_SYSERR, name, "%s");
  80                 return (1);
  81         }
  82
  83         /* Put it on the ex queue. */
  84         return (ex_run_str(sp, name, bp, (size_t)sb.st_size, 1, 1));
  85 }