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
|
/********************************************
dosexec.h
copyright 1991, Michael D. Brennan
This is a source file for mawk, an implementation of
the AWK programming language.
Mawk is distributed without warranty under the terms of
the GNU General Public License, version 2, 1991.
********************************************/
/*$Log: dosexec.c,v $
* Revision 1.3 1995/08/20 16:37:22 mike
* exit(1) -> exit(2)
*
* Revision 1.2 1994/10/08 18:50:03 mike
* remove SM_DOS
*
* Revision 1.1.1.1 1993/07/03 18:58:47 mike
* move source to cvs
*
* Revision 1.4 1992/12/05 22:29:43 mike
* dos patch 112d:
* don't use string_buff
* check COMSPEC
*
* Revision 1.3 1992/07/10 16:21:57 brennan
* store exit code of input pipes
*
* Revision 1.2 1991/11/16 10:27:18 brennan
* BINMODE
*
* Revision 1.1 91/10/29 09:45:56 brennan
* Initial revision
*
*/
/* system() and pipes() for MSDOS */
#include "mawk.h"
#if MSDOS
#include "memory.h"
#include "files.h"
#include "fin.h"
#include <process.h>
static void PROTO(get_shell, (void)) ;
static char *shell ; /* e.g. "c:\\sys\\command.com" */
static char *command_opt ; /* " /c" */
static void get_shell()
{ char *s , *p ;
int len ;
if ( s = getenv("MAWKSHELL") )
{
/* break into shell part and option part */
p = s ;
while ( *p != ' ' && *p != '\t' ) p++ ;
len = p - s ;
shell = (char *) zmalloc(len+1) ;
memcpy(shell, s, len) ; shell[len] = 0 ;
command_opt = p ;
}
else
if ( s = getenv("COMSPEC") )
{
shell = s ;
command_opt = " /c" ;
/* leading space needed because of bug in command.com */
}
else
{
errmsg(0,
"cannot exec(), must set MAWKSHELL or COMSPEC in environment" ) ;
exit(2) ;
}
}
int DOSexec( command )
char *command ;
{
char xbuff[256] ;
if ( ! shell ) get_shell() ;
sprintf(xbuff, "%s %s", command_opt, command) ;
fflush(stderr) ; fflush(stdout) ;
return spawnl(P_WAIT, shell, shell, xbuff, (char *) 0 ) ;
}
static int next_tmp ; /* index for naming temp files */
static char *tmpdir ; /* directory to hold temp files */
static unsigned mawkid ; /* unique to this mawk process */
/* compute the unique temp file name associated with id */
char *tmp_file_name(id, buffer )
int id ;
char *buffer ;
{
if ( mawkid == 0 )
{
/* first time */
union {
void far *ptr ;
unsigned w[2] ;
} xptr ;
xptr.ptr = (void far*)&mawkid ;
mawkid = xptr.w[1] ;
tmpdir = getenv("MAWKTMPDIR") ;
if ( ! tmpdir || strlen(tmpdir) > 80 ) tmpdir = "" ;
}
(void) sprintf(buffer, "%sMAWK%04X.%03X",tmpdir, mawkid, id) ;
return buffer ;
}
/* open a pipe, returning a temp file identifier by
reference
*/
PTR get_pipe( command, type, tmp_idp)
char *command ;
int type, *tmp_idp ;
{
PTR retval ;
char xbuff[256] ;
char *tmpname ;
*tmp_idp = next_tmp ;
tmpname = tmp_file_name(next_tmp, xbuff+163) ;
if ( type == PIPE_OUT )
{
retval = (PTR) fopen(tmpname, (binmode()&2)? "wb":"w") ;
}
else
{
sprintf(xbuff, "%s > %s" , command, tmpname) ;
tmp_idp[1] = DOSexec(xbuff) ;
retval = (PTR) FINopen(tmpname, 0) ;
}
next_tmp++ ;
return retval ;
}
/* closing a fake pipes involves running the out pipe
command
*/
int close_fake_outpipe(command, tid)
char *command ;
int tid ; /* identifies the temp file */
{
char xbuff[256] ;
char *tmpname = tmp_file_name(tid, xbuff+163) ;
int retval ;
sprintf(xbuff, "%s < %s", command, tmpname) ;
retval = DOSexec(xbuff) ;
(void) unlink(tmpname) ;
return retval ;
}
#endif /* MSDOS */
|
