1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
/* vms_fwrite.c - augmentation for the fwrite() function.
Copyright (C) 1991-1996 the Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include "awk.h" /* really "../awk.h" */
#ifndef NO_TTY_FWRITE
#include "vms.h"
#include <stdio.h>
#include <errno.h>
#ifdef VAXC_BUILTINS
#pragma builtins /* VAXC V3.0 & up */
# define find_c(s,n,c) ((n) - _LOCC((c),(n),(s)))
#else /*VAXC_BUILTINS*/
static int find_c( const char *s, int n, char c ) {
register const char *t = (const char *)memchr(s, c, n);
return (t == 0 ? n : t - s); /* 0..n-1, or n if not found */
}
#endif /*VAXC_BUILTINS*/
#define is_stdout(file_no) ((file_no) == 1) /* fileno(stdout) */
#define is_stderr(file_no) ((file_no) == 2) /* fileno(stderr) */
#define PREFIX_CR 0x008D0000 /* leading carriage return */
#define POSTFIX_CR 0x8D000000 /* trailing carriage return (=> lf/cr) */
static short channel[_NFILE] = {0};
static FILE *prev_file = 0;
static int prev_file_num;
/*
* VAXCRTL's fwrite() seems to flush after every character when
* writing to a terminal. This routine is a limited functionality
* substitute that is *much* faster. However, calls to fwrite()
* should not be mixed with other stdio calls to the same file
* unless fflush() is always called first. Also, this routine
* will not detect that a freopen() call has finished with the
* original terminal; tty_fclose() should be used to close a file.
*/
#ifdef fwrite
# undef fwrite
#endif
/* tty_fwrite() - performance hack for fwrite() to a terminal */
size_t
tty_fwrite( const void *buf, size_t size, size_t number, FILE *file )
{
static long evfn = -1;
short chan;
int file_num, result;
if (!size || !number)
return 0;
else if (!file || !*file)
return 0 * (errno = EBADF); /* kludge alert! */
else if (file == prev_file)
file_num = prev_file_num;
else /* note: VAXCRTL's fileno() is a function, not just a macro */
prev_file_num = file_num = fileno(file), prev_file = file;
chan = file_num < _NFILE ? channel[file_num] : -1;
if (chan == 0) { /* if not initialized, need to assign a channel */
if (isatty(file_num) > 0) { /* isatty: 1=yes, 0=no, -1=problem */
Dsc device;
char devnam[255+1];
fgetname(file, devnam); /* get 'file's name */
device.len = strlen(device.adr = devnam); /* create descriptor */
if (vmswork(sys$assign(&device, &chan, 0, (Dsc *)0))) {
/* get an event flag; use #0 if problem */
if (evfn == -1 && vmsfail(lib$get_ef(&evfn))) evfn = 0;
} else chan = 0; /* $ASSIGN failed */
}
/* store channel for later use; -1 => don't repeat failed init attempt */
channel[file_num] = (chan > 0 ? chan : -1);
}
if (chan > 0) { /* chan > 0 iff 'file' is a terminal */
struct _iosbw { U_Short status, count; U_Long rt_kludge; } iosb;
register U_Long sts = 1;
register char *pt = (char *)buf;
register int offset, pos, count = size * number;
U_Long cc_fmt, io_func = IO$_WRITEVBLK;
int extra = 0;
result = 0;
if (is_stderr(file_num)) /* if it's SYS$ERROR (stderr)... */
io_func |= IO$M_CANCTRLO; /* cancel ^O (resume tty output) */
while (count > 0) {
/* special handling for line-feeds to make them be 'newlines' */
offset = 0;
if (*pt == '\n') { /* got at least one leading line-feed */
cc_fmt = PREFIX_CR, extra++; /* precede 1st LF with a CR */
do offset++;
while (offset < count && *(pt + offset) == '\n');
} else
cc_fmt = 0;
/* look for another line-feed; if found, break line there */
pos = offset + find_c(pt + offset, count - offset, '\n');
if (pos >= BUFSIZ) pos = BUFSIZ - 1; /* throttle quota usage */
else if (pos < count) pos++, cc_fmt |= POSTFIX_CR, extra++;
/* wait for previous write, if any, to complete */
if (pt > (char *)buf) {
sts = sys$synch(evfn, &iosb);
if (vmswork(sts)) sts = iosb.status, result += iosb.count;
if (vmsfail(sts)) break;
}
/* queue an asynchronous write */
sts = sys$qio(evfn, chan, io_func, &iosb, (void (*)(U_Long))0, 0L,
pt, pos, 0, cc_fmt, 0, 0);
if (vmsfail(sts)) break; /*(should never happen)*/
pt += pos, count -= pos;
}
/* wait for last write to complete */
if (pt > (char *)buf && vmswork(sts)) {
sts = sys$synch(evfn, &iosb);
if (vmswork(sts)) sts = iosb.status, result += iosb.count;
}
if (vmsfail(sts)) errno = EVMSERR, vaxc$errno = sts;
else if (iosb.rt_kludge == 0) result = number + extra;
result -= extra; /* subtract the additional carriage-returns */
} else { /* use stdio */
/* Note: we assume that we're writing text, not binary data.
For stream format files, 'size' and 'number' are effectively
interchangable, and fwrite works fine. However, for record
format files, 'size' governs the maximum record length, so
fwrite(string, size(char), strlen(string), file)
will produce a sequence of 1-byte records, which is hardly
what we want in this (assumed) situation. Line-feeds ('\n')
are converted into newlines (ie, record separators) by the
run-time library, but strings that don't end with a newline
still become separate records. The simplest work around
is just to use fputs() instead of fwrite(); unfortunately,
we have to provide special treatment for NULs ('\0's).
At present, only stdout might be in record format (via
>$'filename' redirection on the command line).
*/
if (size > 1) { /* not used by GAWK */
result = fwrite((void *)buf, size, number, file);
} else if (*((char *)buf + number - 1) == '\n' || !is_stdout(file_num)) {
result = fwrite((void *)buf, number, size, file);
result = result * number / size; /*(same as 'result = number')*/
} else {
#ifdef NO_ALLOCA
# define alloca(n) ((n) <= abuf_siz ? abuf : \
((abuf_siz > 0 ? (free(abuf),0) : 0), \
(abuf = malloc(abuf_siz = (n)+20))))
static void *abuf = 0;
static size_t abuf_siz = 0;
#endif /*NO_ALLOCA*/
register char *pt = (char *)buf;
register int pos, count = number;
if (pt[count] != '\0') { /*(out of bounds, but relatively safe)*/
pt = (char *)alloca(count + 1);
memcpy(pt, buf, count), pt[count] = '\0';
/* if exiting this block undoes the alloca(), we're hosed :-( */
}
result = 0;
while (count > 0) {
pos = find_c(pt, count, '\0');
if (fputs(pt, file) < 0) break;
if (pos < count) {
if (fputc('\0', file) < 0) break;
pos++; /* 0..n-1 -> 1..n */
}
result += pos, pt += pos, count -= pos;
}
}
}
return result;
}
#define fwrite(b,s,n,f) tty_fwrite((b),(s),(n),(f))
#ifdef fclose
# undef fclose
#endif
/* tty_fclose() - keep tty_fwrite() up to date when closing a file */
int
tty_fclose( FILE *file )
{
if (file && *file) { /* note: VAXCRTL stdio has extra level of indirection */
int file_num = fileno(file);
short chan = file_num < _NFILE ? channel[file_num] : -1;
if (chan > 0)
(void)sys$dassgn(chan); /* deassign the channel (ie, close) */
if (file_num < _NFILE)
channel[file_num] = 0; /* clear stale info */
}
prev_file = 0; /* force tty_fwrite() to reset */
return fclose(file);
}
#define fclose(f) tty_fclose(f)
#endif /*!NO_TTY_FWRITE*/
|
