1 /*
2 * *****************************************************************************
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 *
6 * Copyright (c) 2018-2024 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,const char * argv[])57 main(int argc, const char* argv[])
58 {
59 BcStatus s;
60 char* name;
61 size_t len = strlen(BC_EXECPREFIX);
62
63 #if BC_ENABLE_NLS
64 // Must set the locale properly in order to have the right error messages.
65 vm->locale = setlocale(LC_ALL, "");
66 #endif // BC_ENABLE_NLS
67
68 // Set the start pledge().
69 bc_pledge(bc_pledge_start, NULL);
70
71 // Sometimes, argv[0] can be NULL. Better make sure to be robust against it.
72 if (argv[0] != NULL)
73 {
74 // Figure out the name of the calculator we are using. We can't use
75 // basename because it's not portable, but yes, this is stripping off
76 // the directory.
77 name = strrchr(argv[0], BC_FILE_SEP);
78 vm->name = (name == NULL) ? argv[0] : name + 1;
79 }
80 else
81 {
82 #if !DC_ENABLED
83 vm->name = "bc";
84 #elif !BC_ENABLED
85 vm->name = "dc";
86 #else
87 // Just default to bc in that case.
88 vm->name = "bc";
89 #endif
90 }
91
92 // If the name is longer than the length of the prefix, skip the prefix.
93 if (strlen(vm->name) > len) vm->name += len;
94
95 BC_SIG_LOCK;
96
97 // We *must* do this here. Otherwise, other code could not jump out all of
98 // the way.
99 bc_vec_init(&vm->jmp_bufs, sizeof(sigjmp_buf), BC_DTOR_NONE);
100
101 BC_SETJMP_LOCKED(vm, exit);
102
103 #if BC_CLANG
104 #pragma clang diagnostic push
105 #pragma clang diagnostic ignored "-Wcast-qual"
106 #endif // BC_CLANG
107 #if !DC_ENABLED
108 s = bc_main(argc, (const char**) argv);
109 #elif !BC_ENABLED
110 s = dc_main(argc, (const char**) argv);
111 #else
112 // BC_IS_BC uses vm->name, which was set above. So we're good.
113 if (BC_IS_BC) s = bc_main(argc, (const char**) argv);
114 else s = dc_main(argc, (const char**) argv);
115 #endif
116 #if BC_CLANG
117 #pragma clang diagnostic pop
118 #endif // BC_CLANG
119
120 vm->status = (sig_atomic_t) s;
121
122 exit:
123 BC_SIG_MAYLOCK;
124
125 s = bc_vm_atexit((BcStatus) vm->status);
126
127 return (int) s;
128 }
129