1 /*-------------------------------------------------------------------------
2 *
3 * system.c
4 * Win32 system() and popen() replacements
5 *
6 *
7 * Win32 needs double quotes at the beginning and end of system()
8 * strings. If not, it gets confused with multiple quoted strings.
9 * It also requires double-quotes around the executable name and
10 * any files used for redirection. Filter other args through
11 * appendShellString() to quote them.
12 *
13 * Generated using Win32 "CMD /?":
14 *
15 * 1. If all of the following conditions are met, then quote characters
16 * on the command line are preserved:
17 *
18 * - no /S switch
19 * - exactly two quote characters
20 * - no special characters between the two quote characters, where special
21 * is one of: &<>()@^|
22 * - there are one or more whitespace characters between the two quote
23 * characters
24 * - the string between the two quote characters is the name of an
25 * executable file.
26 *
27 * 2. Otherwise, old behavior is to see if the first character is a quote
28 * character and if so, strip the leading character and remove the last
29 * quote character on the command line, preserving any text after the last
30 * quote character.
31 *
32 * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
33 *
34 * src/port/system.c
35 *
36 *-------------------------------------------------------------------------
37 */
38
39 #if defined(WIN32) && !defined(__CYGWIN__)
40
41 #ifndef FRONTEND
42 #include "postgres.h"
43 #else
44 #include "postgres_fe.h"
45 #endif
46
47 #include <fcntl.h>
48
49 #undef system
50 #undef popen
51
52 int
pgwin32_system(const char * command)53 pgwin32_system(const char *command)
54 {
55 size_t cmdlen = strlen(command);
56 char *buf;
57 int save_errno;
58 int res;
59
60 /*
61 * Create a malloc'd copy of the command string, enclosed with an extra
62 * pair of quotes
63 */
64 buf = malloc(cmdlen + 2 + 1);
65 if (buf == NULL)
66 {
67 errno = ENOMEM;
68 return -1;
69 }
70 buf[0] = '"';
71 memcpy(&buf[1], command, cmdlen);
72 buf[cmdlen + 1] = '"';
73 buf[cmdlen + 2] = '\0';
74
75 res = system(buf);
76
77 save_errno = errno;
78 free(buf);
79 errno = save_errno;
80
81 return res;
82 }
83
84
85 FILE *
pgwin32_popen(const char * command,const char * type)86 pgwin32_popen(const char *command, const char *type)
87 {
88 size_t cmdlen = strlen(command);
89 char *buf;
90 int save_errno;
91 FILE *res;
92
93 /*
94 * Create a malloc'd copy of the command string, enclosed with an extra
95 * pair of quotes
96 */
97 buf = malloc(cmdlen + 2 + 1);
98 if (buf == NULL)
99 {
100 errno = ENOMEM;
101 return NULL;
102 }
103 buf[0] = '"';
104 memcpy(&buf[1], command, cmdlen);
105 buf[cmdlen + 1] = '"';
106 buf[cmdlen + 2] = '\0';
107
108 res = _popen(buf, type);
109
110 save_errno = errno;
111 free(buf);
112 errno = save_errno;
113
114 return res;
115 }
116
117 #endif
118