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Mitri Dat 🦉<a href="https://mastodon.social/@rvps2001" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@rvps2001</a> "trained troops"... <a href="https://mastodon.social/tags/Define" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Define</a> "trained" end

Juno Jove<a href="https://pounced-on.me/@nilsding" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@nilsding</a> ``` <a href="https://mastodon.gamedev.place/tags/define" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#define</a> false maybe return maybe;//hey, i just met you! ```

Jyrki :paw_nonbinary:learning about "trailing return types" in C++ and this is what I have in mind now<pre><code>#define auto fn fn isThisRust() -> bool { // nice try return false; } </code></pre>

Izumi Tsutsuisys/arch/m88k/include/vmparam.h で <a href="https://social.mikutter.hachune.net/tags/define" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#define</a> MAXTSIZ (32*1024*1024) /* max text size */ なので 32MB は厳しそう

Félix<a href="https://pony.social/@thephd" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@thephd</a> This works to define rsize_t:<a href="https://tech.lgbt/tags/define" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#define</a> __STDC_WANT_LIB_EXT1__ 1 <a href="https://tech.lgbt/tags/include" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#include</a> <string.h>use “xcrun clang -dD -E file.c”, do the same thing with the broken configuration, see where things go wrong. If you do find there’s a problem with the macOS SDK, that sounds fixable

James Chip*stares at code I just found*the code:<a href="https://merveilles.town/tags/define" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#define</a> CFG01 const struct \ { USB_CFG_DSC cd01; \ USB_INTF_DSC i00a00; \ USB_HID_DSC hid_i00a00; \ USB_EP_DSC ep01i_i00a00; \ USB_EP_DSC ep01o_i00a00; \ } cfg01extern CFG01;

wirepairfucking hell winspool.h:<a href="https://mastodon.social/tags/ifdef" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#ifdef</a> UNICODE <a href="https://mastodon.social/tags/define" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#define</a> AddJob AddJobW <a href="https://mastodon.social/tags/else" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#else</a> <a href="https://mastodon.social/tags/define" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#define</a> AddJob AddJobA <a href="https://mastodon.social/tags/endif" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#endif</a> // !UNICODEJolt defines a class method called... virtual void AddJob(const JobHandle &inJob) override;guess some ordering got re-arranged and now my shit is conflicting

Jann Horninspired by <a href="https://hachyderm.io/@pinskia" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@pinskia</a> mentioning <code>musttail</code>, today I learned that you can implement state machines in C such that state transitions are implemented as calls:<pre><code>#include <stdlib.h> #include <stdio.h> #define VOID __attribute__((noinline)) void #define JUMP [[clang::musttail]] return static char *input; static int acc = 0; static int state = 0; VOID initial_state(void); VOID digit(void) { acc += *(input++) - '0'; JUMP initial_state(); } VOID separator(void) { state = acc; acc = 0; input++; JUMP initial_state(); } VOID add(void) { state += acc; acc = 0; input++; JUMP initial_state(); } VOID minus(void) { state -= acc; acc = 0; input++; JUMP initial_state(); } VOID initial_state(void) { switch (*input) { case '0'...'9': JUMP digit(); case ' ': JUMP separator(); case '+': JUMP add(); case '-': JUMP minus(); default: printf("result: %d\n", state); exit(0); } } int main(int argc, char **argv) { puts("welcome to my calculator"); input = argv[1]; initial_state(); } </code></pre>compiles to stuff like this, all jumps:<pre><code>add: mov eax, dword ptr [rip + acc] add dword ptr [rip + state], eax mov dword ptr [rip + acc], 0 inc qword ptr [rip + input] jmp initial_state </code></pre>And the security benefits are obvious! The less stack you have, the less potential for the stack pointer being hijacked! 😆

Toby Jaffey<a href="https://mstdn.social/@stevensanderson" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@stevensanderson</a> Nice!A tiny improvement: In Step 4, when using fgets() to read, it's good to ensure you're using the same size in the declaration as the fgets() to avoid them getting out of syncEither: <a href="https://mastodon.me.uk/tags/define" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#define</a> BUFSZ 100 ... char buffer[BUFSZ]; ... fgets(buffer, BUFSZ, fptr);Or, as you're working with a stack array, you can do: char buffer[100]; ... fgets(buffer, sizeof(buffer), fptr); Later, in the record system, you can do the same with: fgets(student.name, sizeof(student.name), stdin);

pwm<a class="u-url mention" href="https://clubcyberia.co/users/RustyCrab" rel="nofollow noopener noreferrer" target="_blank">@RustyCrab</a> <a class="u-url mention" href="https://socially.drinkingatmy.computer/users/prettygood" rel="nofollow noopener noreferrer" target="_blank">@prettygood</a> <pre><code>/* Exit with a status code indicating success. Copyright (C) 1999-2025 Free Software Foundation, Inc. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>. */ <a class="hashtag" href="https://darkdork.dev/tag/include" rel="nofollow noopener noreferrer" target="_blank">#include</a> <config.h> <a class="hashtag" href="https://darkdork.dev/tag/include" rel="nofollow noopener noreferrer" target="_blank">#include</a> <stdio.h> <a class="hashtag" href="https://darkdork.dev/tag/include" rel="nofollow noopener noreferrer" target="_blank">#include</a> <sys/types.h> <a class="hashtag" href="https://darkdork.dev/tag/include" rel="nofollow noopener noreferrer" target="_blank">#include</a> "system.h" /* Act like "true" by default; false.c overrides this. */ <a class="hashtag" href="https://darkdork.dev/tag/ifndef" rel="nofollow noopener noreferrer" target="_blank">#ifndef</a> EXIT_STATUS # define EXIT_STATUS EXIT_SUCCESS <a class="hashtag" href="https://darkdork.dev/tag/endif" rel="nofollow noopener noreferrer" target="_blank">#endif</a> <a class="hashtag" href="https://darkdork.dev/tag/if" rel="nofollow noopener noreferrer" target="_blank">#if</a> EXIT_STATUS == EXIT_SUCCESS # define PROGRAM_NAME "true" <a class="hashtag" href="https://darkdork.dev/tag/else" rel="nofollow noopener noreferrer" target="_blank">#else</a> # define PROGRAM_NAME "false" <a class="hashtag" href="https://darkdork.dev/tag/endif" rel="nofollow noopener noreferrer" target="_blank">#endif</a> <a class="hashtag" href="https://darkdork.dev/tag/define" rel="nofollow noopener noreferrer" target="_blank">#define</a> AUTHORS proper_name ("Jim Meyering") void usage (int status) { printf (_("\ Usage: %s [ignored command line arguments]\n\ or: %s OPTION\n\ "), program_name, program_name); printf ("%s\n\n", _(EXIT_STATUS == EXIT_SUCCESS ? N_("Exit with a status code indicating success.") : N_("Exit with a status code indicating failure."))); fputs (HELP_OPTION_DESCRIPTION, stdout); fputs (VERSION_OPTION_DESCRIPTION, stdout); printf (USAGE_BUILTIN_WARNING, PROGRAM_NAME); emit_ancillary_info (PROGRAM_NAME); exit (status); } int main (int argc, char **argv) { /* Recognize --help or --version only if it's the only command-line argument. */ if (argc == 2) { initialize_main (&argc, &argv); set_program_name (argv[0]); setlocale (LC_ALL, ""); bindtextdomain (PACKAGE, LOCALEDIR); textdomain (PACKAGE); /* Note true(1) will return EXIT_FAILURE in the edge case where writes fail with GNU specific options. */ atexit (close_stdout); if (STREQ (argv[1], "--help")) usage (EXIT_STATUS); if (STREQ (argv[1], "--version")) version_etc (stdout, PROGRAM_NAME, PACKAGE_NAME, Version, AUTHORS, (char *) nullptr); } return EXIT_STATUS; } </code></pre>

Foone🏳️‍⚧️I love finding a function that does nothing and is called from 100 places with a debug string.SOMEONE TURNED OFF A <a href="https://digipres.club/tags/DEFINE" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#DEFINE</a> AND THEIR COMPILER DOESN'T KNOW WHAT OPTIMIZATION IS

Lorenzo Stoakes<a href="https://infosec.exchange/@jann" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@jann</a> I mean equally:<a href="https://fosstodon.org/tags/define" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#define</a> _GNU_SOURCE <a href="https://fosstodon.org/tags/include" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#include</a> <err.h> <a href="https://fosstodon.org/tags/include" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#include</a> <stdio.h> <a href="https://fosstodon.org/tags/include" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#include</a> <sys/mman.h> int main(void) { char *p = mmap(NULL, 0x2000, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS, -1, 0); if (p == MAP_FAILED) err(1, "mmap"); p[0x1000] = 'X'; if (madvise(&p[0x1000], 0x1000, MADV_DONTNEED)) err(1, "madvise"); // that 'X' we just wrote... is it gone? // nope, let's bring it back! printf("p[0x1000]='%c'\n", p[0x1000]); }

Jann Hornfun Linux fact: because <code>MAP_SHARED|MAP_ANONYMOUS</code> is actually a file-backed mapping under the hood, unmapping part of such a mapping does not discard the data stored in that part:<pre><code>$ cat mremap.c #define _GNU_SOURCE #include <err.h> #include <stdio.h> #include <sys/mman.h> int main(void) { char *p = mmap(NULL, 0x2000, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS, -1, 0); if (p == MAP_FAILED) err(1, "mmap"); p[0x1000] = 'X'; if (munmap(p+0x1000, 0x1000)) err(1, "munmap"); // that 'X' we just wrote... is it gone? // nope, let's bring it back! p = mremap(p, 0x1000, 0x2000, MREMAP_MAYMOVE); if (p == MAP_FAILED) err(1, "mremap"); printf("p[0x1000]='%c'\n", p[0x1000]); } $ gcc -o mremap mremap.c $ ./mremap p[0x1000]='X' $ </code></pre>

Mike Taylor 🦕I've been coding in C for about 20 years, and about five years ago I spent an hour chasing a case where I'd done if (strcmp(arg, "foo")) instead of if (!strcmp(arg, "foo")).Now I religiously <a href="https://sauropods.win/tags/define" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#define</a> streq(a, b) (!strcmp((a),(b))) because I know I'm not as smart as I think I am.<a href="https://ozlabs.org/~rusty/index.cgi/tech/2008-04-01.html" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://ozlabs.org/~rusty/index.cgi/tech/2008-04-01.html</a>

Jevin Sweval<a href="https://infosec.space/@siguza" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@siguza</a> Get a new bible.Try this with Xcode 16.3:extern int foo(void);<a href="https://mastodon.social/tags/define" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#define</a> V(x) __attribute__((target_version(x)))V("sha2") int foo(void) { return 2; } V("default") int foo(void) { return 0; }

Stylus<a href="https://sparkly.uni.horse/@emily" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@emily</a> omg you're not pulling my leg<pre><code>#define XF86XK_Calculator 0x1008FF1D /* Invoke calculator program */ #define XF86XK_Calculater 0x1008FF54 /* Launch Calculater */ </code></pre>

Izumi Tsutsui/home/runner/work/netbsd-src/netbsd-src/src/tools/hp300-mkboot/../../sys/arch/hp300/stand/mkboot/mkboot.c: In function 'main': /home/runner/work/netbsd-src/netbsd-src/src/tools/compat/../../sys/sys/bootblock.h:994:34: error: 'LIF_NUMDIR' undeclared (first use in this function); did you mean 'HPPA_LIF_NUMDIR'? 994 | <a href="https://social.mikutter.hachune.net/tags/define" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#define</a> HP300_LIF_DIRSIZE (LIF_NUMDIR * sizeof(struct hp300_lifdir)) | ^~~~~~~~~~またミスっている

Andreas Fink<a href="https://tapbots.social/@paul" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@paul</a> const NSString *aaa=... . on the other hand NSString is immutable anyway. So <a href="https://mastodon.sl/tags/define" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#define</a> aaa =@"..." would do too

Hubert FiguièreImplicit member variables (in C++).Now let's use <a href="https://cosocial.ca/tags/define" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#define</a> to shadow the variable as field of a struct field of a scruct. Something like that.Pointer as array as pointer and the associated arithmetics. Where are we in the buffer again?Also for loops assign and compare and assign. And of course at lot of UB.Etc.

Al Sutton<a href="https://fosstodon.org/@jbqueru" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@jbqueru</a> <a href="https://snapp.social/tags/define" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#define</a> OK 200what could possibly go wrong? :)

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