contrib/nvi2/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 10.17 2011/12/19 16:17:06 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 <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(SCR *, EXCMD *);
  36  */
  37 int
  38 ex_source(SCR *sp, EXCMD *cmdp)
  39 {
  40         struct stat sb;
  41         int fd, len;
  42         char *bp;
  43         char *name, *np;
  44         size_t nlen;
  45         CHAR_T *wp;
  46         size_t wlen;
  47         int rc;
  48
  49         INT2CHAR(sp, cmdp->argv[0]->bp, cmdp->argv[0]->len + 1, name, nlen);
  50         if ((fd = open(name, O_RDONLY, 0)) < 0 || fstat(fd, &sb))
  51                 goto err;
  52
  53         /*
  54          * XXX
  55          * I'd like to test to see if the file is too large to malloc.  Since
  56          * we don't know what size or type off_t's or size_t's are, what the
  57          * largest unsigned integral type is, or what random insanity the local
  58          * C compiler will perpetrate, doing the comparison in a portable way
  59          * is flatly impossible.  So, put an fairly unreasonable limit on it,
  60          * I don't want to be dropping core here.
  61          */
  62 #define MEGABYTE        1048576
  63         if (sb.st_size > MEGABYTE) {
  64                 errno = ENOMEM;
  65                 goto err;
  66         }
  67
  68         MALLOC(sp, bp, char *, (size_t)sb.st_size + 1);
  69         if (bp == NULL) {
  70                 (void)close(fd);
  71                 return (1);
  72         }
  73         bp[sb.st_size] = '\0';
  74
  75         /* Read the file into memory. */
  76         len = read(fd, bp, (int)sb.st_size);
  77         (void)close(fd);
  78         if (len == -1 || len != sb.st_size) {
  79                 if (len != sb.st_size)
  80                         errno = EIO;
  81                 free(bp);
  82 err:            msgq_str(sp, M_SYSERR, name, "%s");
  83                 return (1);
  84         }
  85
  86         np = strdup(name);
  87         if (CHAR2INT(sp, bp, (size_t)sb.st_size + 1, wp, wlen))
  88                 msgq(sp, M_ERR, "323|Invalid input. Truncated.");
  89         /* Put it on the ex queue. */
  90         rc = ex_run_str(sp, np, wp, wlen - 1, 1, 0);
  91         if (np != NULL)
  92                 free(np);
  93         free(bp);
  94         return (rc);
  95 }