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 10.14 2000/07/16 15:37:24 skimo Exp $ (Berkeley) $Date: 2000/07/16 15:37:24 $";
  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;
  45         char *name;
  46         size_t nlen;
  47         CHAR_T *wp, *dp;
  48         size_t wlen;
  49
  50         INT2CHAR(sp, cmdp->argv[0]->bp, cmdp->argv[0]->len + 1, name, nlen);
  51         if ((fd = open(name, O_RDONLY, 0)) < 0 || fstat(fd, &sb))
  52                 goto err;
  53
  54         /*
  55          * XXX
  56          * I'd like to test to see if the file is too large to malloc.  Since
  57          * we don't know what size or type off_t's or size_t's are, what the
  58          * largest unsigned integral type is, or what random insanity the local
  59          * C compiler will perpetrate, doing the comparison in a portable way
  60          * is flatly impossible.  So, put an fairly unreasonable limit on it,
  61          * I don't want to be dropping core here.
  62          */
  63 #define MEGABYTE        1048576
  64         if (sb.st_size > MEGABYTE) {
  65                 errno = ENOMEM;
  66                 goto err;
  67         }
  68
  69         MALLOC(sp, bp, char *, (size_t)sb.st_size + 1);
  70         if (bp == NULL) {
  71                 (void)close(fd);
  72                 return (1);
  73         }
  74         bp[sb.st_size] = '\0';
  75
  76         /* Read the file into memory. */
  77         len = read(fd, bp, (int)sb.st_size);
  78         (void)close(fd);
  79         if (len == -1 || len != sb.st_size) {
  80                 if (len != sb.st_size)
  81                         errno = EIO;
  82                 free(bp);
  83 err:            msgq_str(sp, M_SYSERR, name, "%s");
  84                 return (1);
  85         }
  86
  87         CHAR2INT(sp, bp, (size_t)sb.st_size + 1, wp, wlen);
  88         dp = v_wstrdup(sp, wp, wlen - 1);
  89         free(bp);
  90         /* Put it on the ex queue. */
  91         INT2CHAR(sp, cmdp->argv[0]->bp, cmdp->argv[0]->len + 1, name, nlen);
  92         return (ex_run_str(sp, name, dp, (size_t)sb.st_size, 1, 1));
  93 }