1 /* gawkmisc.c --- miscellanious gawk routines that are OS specific.
2
3 Copyright (C) 1986, 1988, 1989, 1991 - 96 the Free Software Foundation, Inc.
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2, or (at your option)
8 any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software Foundation,
17 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
18
19 char quote = '\'';
20 char *defpath = DEFPATH;
21 char envsep = ':';
22
23 /* gawk_name --- pull out the "gawk" part from how the OS called us */
24
25 char *
gawk_name(filespec)26 gawk_name(filespec)
27 const char *filespec;
28 {
29 char *p;
30
31 /* "path/name" -> "name" */
32 p = strrchr(filespec, '/');
33 return (p == NULL ? (char *) filespec : p + 1);
34 }
35
36 /* os_arg_fixup --- fixup the command line */
37
38 void
os_arg_fixup(argcp,argvp)39 os_arg_fixup(argcp, argvp)
40 int *argcp;
41 char ***argvp;
42 {
43 /* no-op */
44 return;
45 }
46
47 /* os_devopen --- open special per-OS devices */
48
49 int
os_devopen(name,flag)50 os_devopen(name, flag)
51 const char *name;
52 int flag;
53 {
54 /* no-op */
55 return INVALID_HANDLE;
56 }
57
58 /* optimal_bufsize --- determine optimal buffer size */
59
60 int
optimal_bufsize(fd,stb)61 optimal_bufsize(fd, stb)
62 int fd;
63 struct stat *stb;
64 {
65 /* force all members to zero in case OS doesn't use all of them. */
66 memset(stb, '\0', sizeof(struct stat));
67
68 /*
69 * System V.n, n < 4, doesn't have the file system block size in the
70 * stat structure. So we have to make some sort of reasonable
71 * guess. We use stdio's BUFSIZ, since that is what it was
72 * meant for in the first place.
73 */
74 #ifdef HAVE_ST_BLKSIZE
75 #define DEFBLKSIZE (stb->st_blksize ? stb->st_blksize : BUFSIZ)
76 #else
77 #define DEFBLKSIZE BUFSIZ
78 #endif
79
80 if (isatty(fd))
81 return BUFSIZ;
82 if (fstat(fd, stb) == -1)
83 fatal("can't stat fd %d (%s)", fd, strerror(errno));
84 if (lseek(fd, (off_t)0, 0) == -1) /* not a regular file */
85 return DEFBLKSIZE;
86 if (stb->st_size > 0 && stb->st_size < DEFBLKSIZE) /* small file */
87 return stb->st_size;
88 return DEFBLKSIZE;
89 }
90
91 /* ispath --- return true if path has directory components */
92
93 int
ispath(file)94 ispath(file)
95 const char *file;
96 {
97 return (strchr(file, '/') != NULL);
98 }
99
100 /* isdirpunct --- return true if char is a directory separator */
101
102 int
isdirpunct(c)103 isdirpunct(c)
104 int c;
105 {
106 return (c == '/');
107 }
108
109