mirror of
https://github.com/jart/cosmopolitan.git
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68 lines
3.2 KiB
C
68 lines
3.2 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/bits/bits.h"
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#include "libc/bits/safemacros.internal.h"
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#include "libc/calls/calls.h"
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#include "libc/errno.h"
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#include "libc/macros.internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/runtime/symbols.internal.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/auxv.h"
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/**
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* Returns path of binary with the debug information, or null.
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*
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* @return path to debug binary, or -1 w/ errno
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*/
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const char *FindDebugBinary(void) {
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unsigned i, len;
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char buf[2][PATH_MAX];
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static char res[PATH_MAX];
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const char *bins[4], *pwd, *comdbg;
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if (res[0]) return res;
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if ((comdbg = emptytonull(getenv("COMDBG")))) return comdbg;
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if (res[0]) return res;
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bins[0] = program_invocation_name;
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bins[1] = (const char *)getauxval(AT_EXECFN);
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pwd = emptytonull(getenv("PWD"));
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for (i = 0; i < 2; ++i) {
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if (pwd && bins[i] && bins[i][0] != '/' && bins[i][0] != '\\' &&
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strlen(pwd) + 1 + strlen(bins[i]) + 1 <= ARRAYLEN(buf[0])) {
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strcpy(buf[i], pwd);
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strcat(buf[i], "/");
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strcat(buf[i], bins[i]);
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bins[i + 2] = buf[i];
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}
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}
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for (i = 0; i < 4; ++i) {
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if (!bins[i]) continue;
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len = strlen(bins[i]);
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memcpy(res, bins[i], len + 1);
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if (!endswith(res, ".dbg") && len + 3 + 1 <= ARRAYLEN(res)) {
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strcat(res, ".dbg");
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}
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if (fileexists(res)) {
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return res;
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}
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}
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res[0] = '\0';
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errno = ENOENT;
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return NULL;
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}
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