52 lines
2.8 KiB
C
52 lines
2.8 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/calls/calls.h"
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#include "libc/errno.h"
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#include "libc/macros.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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static char buf[PATH_MAX];
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if (buf[0]) return &buf[0];
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const char *const trybins[] = {program_invocation_name,
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(const char *)getauxval(AT_EXECFN)};
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for (unsigned i = 0; i < ARRAYLEN(trybins); ++i) {
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const char *res = trybins[i];
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unsigned len = strlen(res);
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if (4 < len && len < sizeof(buf) - 5) {
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if (strcmp(res + len - 4, ".dbg") == 0) return res;
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/* try suffixing extension, e.g. .com → .com.dbg */
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memcpy(mempcpy(buf, res, len), ".dbg", 5);
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if (fileexists(buf)) return &buf[0];
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buf[0] = '\0';
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}
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}
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errno = ENOENT;
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return NULL;
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}
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