1 /*
2 * *****************************************************************************
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 *
6 * Copyright (c) 2018-2023 Gavin D. Howard and contributors.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 *
11 * * Redistributions of source code must retain the above copyright notice, this
12 * list of conditions and the following disclaimer.
13 *
14 * * Redistributions in binary form must reproduce the above copyright notice,
15 * this list of conditions and the following disclaimer in the documentation
16 * and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 *
30 * *****************************************************************************
31 *
32 * The entry point for bc.
33 *
34 */
35
36 #include <assert.h>
37 #include <stdlib.h>
38 #include <string.h>
39
40 #if BC_ENABLE_NLS
41 #include <locale.h>
42 #endif // BC_ENABLE_NLS
43
44 #ifndef _WIN32
45 #include <libgen.h>
46 #endif // _WIN32
47
48 #include <setjmp.h>
49
50 #include <version.h>
51 #include <status.h>
52 #include <vm.h>
53 #include <bc.h>
54 #include <dc.h>
55
56 int
main(int argc,char * argv[])57 main(int argc, char* argv[])
58 {
59 char* name;
60 size_t len = strlen(BC_EXECPREFIX);
61
62 #if BC_ENABLE_NLS
63 // Must set the locale properly in order to have the right error messages.
64 vm->locale = setlocale(LC_ALL, "");
65 #endif // BC_ENABLE_NLS
66
67 // Set the start pledge().
68 bc_pledge(bc_pledge_start, NULL);
69
70 // Sometimes, argv[0] can be NULL. Better make sure to be robust against it.
71 if (argv[0] != NULL)
72 {
73 // Figure out the name of the calculator we are using. We can't use
74 // basename because it's not portable, but yes, this is stripping off
75 // the directory.
76 name = strrchr(argv[0], BC_FILE_SEP);
77 vm->name = (name == NULL) ? argv[0] : name + 1;
78 }
79 else
80 {
81 #if !DC_ENABLED
82 vm->name = "bc";
83 #elif !BC_ENABLED
84 vm->name = "dc";
85 #else
86 // Just default to bc in that case.
87 vm->name = "bc";
88 #endif
89 }
90
91 // If the name is longer than the length of the prefix, skip the prefix.
92 if (strlen(vm->name) > len) vm->name += len;
93
94 BC_SIG_LOCK;
95
96 // We *must* do this here. Otherwise, other code could not jump out all of
97 // the way.
98 bc_vec_init(&vm->jmp_bufs, sizeof(sigjmp_buf), BC_DTOR_NONE);
99
100 BC_SETJMP_LOCKED(vm, exit);
101
102 #if !DC_ENABLED
103 bc_main(argc, argv);
104 #elif !BC_ENABLED
105 dc_main(argc, argv);
106 #else
107 // BC_IS_BC uses vm->name, which was set above. So we're good.
108 if (BC_IS_BC) bc_main(argc, argv);
109 else dc_main(argc, argv);
110 #endif
111
112 exit:
113 BC_SIG_MAYLOCK;
114
115 // Ensure we exit appropriately.
116 return bc_vm_atexit((int) vm->status);
117 }
118