1 /* $OpenBSD: ex_source.c,v 1.11 2021/10/24 21:24:17 deraadt Exp $ */
2
3 /*-
4 * Copyright (c) 1992, 1993, 1994
5 * The Regents of the University of California. All rights reserved.
6 * Copyright (c) 1992, 1993, 1994, 1995, 1996
7 * Keith Bostic. All rights reserved.
8 *
9 * See the LICENSE file for redistribution information.
10 */
11
12 #include "config.h"
13
14 #include <sys/types.h>
15 #include <sys/queue.h>
16 #include <sys/stat.h>
17
18 #include <bitstring.h>
19 #include <errno.h>
20 #include <fcntl.h>
21 #include <limits.h>
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <string.h>
25 #include <unistd.h>
26
27 #include "../common/common.h"
28
29 /*
30 * ex_sourcefd -- :source already opened file
31 * Execute ex commands from the given file descriptor
32 *
33 * PUBLIC: int ex_sourcefd(SCR *, EXCMD *, int);
34 */
35 int
ex_sourcefd(SCR * sp,EXCMD * cmdp,int fd)36 ex_sourcefd(SCR *sp, EXCMD *cmdp, int fd)
37 {
38 struct stat sb;
39 int len;
40 char *bp, *name;
41
42 name = cmdp->argv[0]->bp;
43 if (fstat(fd, &sb))
44 goto err;
45
46 /*
47 * XXX
48 * I'd like to test to see if the file is too large to malloc. Since
49 * we don't know what size or type off_t's or size_t's are, what the
50 * largest unsigned integral type is, or what random insanity the local
51 * C compiler will perpetrate, doing the comparison in a portable way
52 * is flatly impossible. So, put an fairly unreasonable limit on it,
53 * I don't want to be dropping core here.
54 */
55 #define MEGABYTE 1048576
56 if (sb.st_size > MEGABYTE) {
57 errno = ENOMEM;
58 goto err;
59 }
60
61 MALLOC(sp, bp, (size_t)sb.st_size + 1);
62 if (bp == NULL) {
63 (void)close(fd);
64 return (1);
65 }
66 bp[sb.st_size] = '\0';
67
68 /* Read the file into memory. */
69 len = read(fd, bp, (int)sb.st_size);
70 (void)close(fd);
71 if (len == -1 || len != sb.st_size) {
72 if (len != sb.st_size)
73 errno = EIO;
74 free(bp);
75 err: msgq_str(sp, M_SYSERR, name, "%s");
76 return (1);
77 }
78
79 /* Put it on the ex queue. */
80 return (ex_run_str(sp, name, bp, (size_t)sb.st_size, 1, 1));
81 }
82
83 /*
84 * ex_source -- :source file
85 * Execute ex commands from a file.
86 *
87 * PUBLIC: int ex_source(SCR *, EXCMD *);
88 */
89 int
ex_source(SCR * sp,EXCMD * cmdp)90 ex_source(SCR *sp, EXCMD *cmdp)
91 {
92 char *name;
93 int fd;
94
95 name = cmdp->argv[0]->bp;
96 if ((fd = open(name, O_RDONLY)) >= 0)
97 return (ex_sourcefd(sp, cmdp, fd));
98
99 msgq_str(sp, M_SYSERR, name, "%s");
100 return (1);
101 }
102