zundon

SASANO Takayoshi<a href="https://social.mikutter.hachune.net/tags/include" class="mention hashtag" rel="nofollow noopener" target="_blank">#include</a> <stdio.h> <a href="https://social.mikutter.hachune.net/tags/include" class="mention hashtag" rel="nofollow noopener" target="_blank">#include</a> <fcntl.h> <a href="https://social.mikutter.hachune.net/tags/include" class="mention hashtag" rel="nofollow noopener" target="_blank">#include</a> <unistd.h> <a href="https://social.mikutter.hachune.net/tags/include" class="mention hashtag" rel="nofollow noopener" target="_blank">#include</a> <string.h><a href="https://social.mikutter.hachune.net/tags/define" class="mention hashtag" rel="nofollow noopener" target="_blank">#define</a> MAX_ARGS 16int main(int argc, char *argv[]) { int i, fds[MAX_ARGS]; memset(fds, ~0, sizeof(fds)); for (i = 1; i < argc && i < MAX_ARGS; i++) { fds[i] = open(argv[i], O_RDONLY); if (fds[i] >= 0) printf("%d\n", fds[i]); } for (i = 1; i < argc && i < MAX_ARGS; i++) if (fds[i] >= 0) close(fds[i]); return 0; }

zundaCのincludeはmanページに書いてあるやつを並べるのが吉わよ$ man bind bind(2) System Calls Manual bind(2)NAME bind - bind a name to a socketLIBRARY Standard C library (libc, -lc)SYNOPSIS <a href="https://mastodon.zunda.ninja/tags/include" class="mention hashtag" rel="tag">#include</a> <sys/socket.h> int bind(int sockfd, const struct sockaddr *addr, socklen_t addrlen); :

Jann HornWow, <a href="https://clang.llvm.org/docs/LanguageExtensions.html#builtin-dump-struct" rel="nofollow noopener" target="_blank"><code>__builtin_dump_struct</code></a> is an amazing clang feature, how did I never hear about this before?<pre><code>$ cat test.c #include <stdio.h> struct nested { int n; }; struct foo { int member_a; unsigned long member_b; char *str; void *ptr; struct nested nested; }; int main(void) { struct foo f = { .member_a = 123, .member_b = 0x4141414141414141, .str = "foobar", .ptr = &f, .nested = {.n = 42} }; __builtin_dump_struct(&f, printf); } $ clang -o test test.c && ./test struct foo { int member_a = 123 unsigned long member_b = 4702111234474983745 char * str = "foobar" void * ptr = 0x7fff1df41b78 struct nested nested = { int n = 42 } } </code></pre>The <a href="https://github.com/llvm/llvm-project/commit/0652534131b269eec336a2ed3545642cc01a1300" rel="nofollow noopener" target="_blank">original version</a> of this feature was introduced back in 2018 (though it was <a href="https://github.com/llvm/llvm-project/commit/c4f95ef86a224fe730d2219aab90e88a0e7b03d2" rel="nofollow noopener" target="_blank">reimplemented since</a> in 2022).

モグビリティ∞（インフィニティ）ロボ昔割とやってた。struct config_str config = { <a href="https://social.mikutter.hachune.net/tags/include" class="mention hashtag" rel="nofollow noopener" target="_blank">#include</a> "data.txt" }

zundaこれはきもいなあw$ cat main.c <a href="https://mastodon.zunda.ninja/tags/include" class="mention hashtag" rel="tag">#include</a> <stdio.h>int main(void) { fputs( <a href="https://mastodon.zunda.ninja/tags/include" class="mention hashtag" rel="tag">#include</a> "answer.txt" "\n", stdout ); return 0; } $ cat answer.txt "42" $ gcc -Wall main.c (警告なし) $ ./a.out 42

rinsuki<a href="https://mstdn.rinsuki.net/tags/include" class="mention hashtag" rel="nofollow noopener" target="_blank">#include</a> ？

zunda-Wsign-conversionとかこれを含む-Wconversionだと教えてもらえました。-Wallに入れておいてもらってもよかったよね…$ cat main.c <a href="https://mastodon.zunda.ninja/tags/include" class="mention hashtag" rel="tag">#include</a> <unistd.h>int main(void) { size_t x; char buf[42]; x = read(0, buf, sizeof(buf)); return (x < 1); } $ gcc -Wsign-conversion main.c main.c: In function ‘main’: main.c:8:13: warning: conversion to ‘size_t’ {aka ‘long unsigned int’} from ‘ssize_t’ {aka ‘long int’} may change the sign of the result [-Wsign-conversion] 8 | x = read(0, buf, sizeof(buf)); | ^~~~明示的にキャストすれば怒られない。$ cat main.c <a href="https://mastodon.zunda.ninja/tags/include" class="mention hashtag" rel="tag">#include</a> <unistd.h>int main(void) { size_t x; char buf[42]; x = (size_t) read(0, buf, sizeof(buf)); return (x < 1); } $ gcc -Wconversion main.c $ gcc --version gcc (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0 Copyright (C) 2023 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

zundaman 2 readによると<a href="https://mastodon.zunda.ninja/tags/include" class="mention hashtag" rel="tag">#include</a> <unistd.h> ssize_t read(int fd, void buf[.count], size_t count);なんだけど$ cat main.c <a href="https://mastodon.zunda.ninja/tags/include" class="mention hashtag" rel="tag">#include</a> <unistd.h>int main(void) { size_t x; char buf[42]; x = read(0, buf, sizeof(buf)); return (x < 1); } $ gcc -Wall -Wextra main.cは何の警告もくれないんだねえ…$ gcc --version gcc (GCC) 14.2.1 20240910 Copyright (C) 2024 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

SASANO Takayoshiうーん、Debian12ですら、これかあ。 [ 25%] Building CXX object libtermbench/CMakeFiles/termbench.dir/termbench.cpp.o /home/uaa/termbench-pro/libtermbench/termbench.cpp:17:10: fatal error: format: そのようなファイルやディレクトリはありません 17 | <a href="https://social.mikutter.hachune.net/tags/include" class="mention hashtag" rel="nofollow noopener" target="_blank">#include</a> <format> | ^~~~~~~~ compilation terminated.

zunda"2"へのポインタの内容を*演算子？で取り出してるんだ$ cat c-js.c <a href="https://mastodon.zunda.ninja/tags/include" class="mention hashtag" rel="tag">#include</a> <stdio.h>int main() { printf("%d\n", *"2"); } $ gcc c-js.c && ./a.out 50

zundaそういえば交換法則も成り立つよねw$ cat c-js.c <a href="https://mastodon.zunda.ninja/tags/include" class="mention hashtag" rel="tag">#include</a> <stdio.h>int main() { puts("-0.5" + 1); puts(1 + "-0.5"); } $ gcc c-js.c && ./a.out 0.5 0.5

zunda2も足せるw$ cat c-js.c <a href="https://mastodon.zunda.ninja/tags/include" class="mention hashtag" rel="tag">#include</a> <stdio.h>int main() { puts("-1.5" + 2); } $ gcc c-js.c && ./a.out .5

zundaUBだ♪$ cat return.c <a href="https://mastodon.zunda.ninja/tags/include" class="mention hashtag" rel="tag">#include</a> <stdlib.h> <a href="https://mastodon.zunda.ninja/tags/include" class="mention hashtag" rel="tag">#include</a> <stdio.h>int function(void){ return; }int main(void) { printf("%d\n", function()); return 0; } $ gcc return.c && ./a.out && ./a.out && ./a.out return.c: In function ‘function’: return.c:5:3: warning: ‘return’ with no value, in function returning non-void 5 | return; | ^~~~~~ return.c:4:5: note: declared here 4 | int function(void){ | ^~~~~~~~ -198725291 1404641621 1343713621

ねずみ<a href="https://mstdn.jp/tags/include" class="mention hashtag" rel="nofollow noopener" target="_blank">#include</a> "Cello.h"int main(int argc, char** argv) { /* Stack objects are created using "$" */ var i0 = $(Int, 5); var i1 = $(Int, 3); var i2 = $(Int, 4); /* Heap objects are created using "new" */ var items = new(Array, Int, i0, i1, i2); /* Collections can be looped over */ foreach (item in items) { print("Object %$ is of type %$\n", item, type_of(item)); } /* Heap objects destructed via Garbage Collection */ return 0; }

あっきぃ / C106(日)東7S-33bやったことメモ:RP2040向けの、RTCから時刻を取得するコードを <a href="https://github.com/adafruit/circuitpython/blob/main/lib/mbedtls_config/mbedtls_port.c#L50" rel="nofollow noopener" translate="no" target="_blank">https://github.com/adafruit/circuitpython/blob/main/lib/mbedtls_config/mbedtls_port.c#L50</a>RP2350の場合はpowmanを使って取得するようにしてみた<a href="https://social.mikutter.hachune.net/tags/ifdef" class="mention hashtag" rel="nofollow noopener" target="_blank">#ifdef</a> PICO_RP2350 <a href="https://social.mikutter.hachune.net/tags/include" class="mention hashtag" rel="nofollow noopener" target="_blank">#include</a> "hardware/powman.h" time_t rp2_rtctime_seconds(time_t *timer) { return powman_timer_get_ms() / 1000ULL; } <a href="https://social.mikutter.hachune.net/tags/endif" class="mention hashtag" rel="nofollow noopener" target="_blank">#endif</a>が、CircuitPython側でRuntimeError: pystack exhaustedで死ぬので、たぶんまだなんかおかしい

hyumanase<a href="https://ruby.social/tags/include" class="mention hashtag" rel="nofollow noopener" target="_blank">#include</a> <stdio.h> <a href="https://ruby.social/tags/include" class="mention hashtag" rel="nofollow noopener" target="_blank">#include</a> <string.h>int number_of_1_string(const char *x) { if (strcmp(x, "0") == 0) { return 0; } else if (strcmp(x, "1") == 0) { return 1; } return -1; // エラーコードとして-1を返す }2024-{07-18} Day{12} <a href="https://ruby.social/tags/100DaysOfCode" class="mention hashtag" rel="nofollow noopener" target="_blank">#100DaysOfCode</a>

hyumanase<a href="https://ruby.social/tags/include" class="mention hashtag" rel="nofollow noopener" target="_blank">#include</a> <stdio.h>int main () { printf("C programming is fun!\n"); return 0; }2024-{07-17} Day{11} <a href="https://ruby.social/tags/100DaysOfCode" class="mention hashtag" rel="nofollow noopener" target="_blank">#100DaysOfCode</a>

hyumanase<a href="https://ruby.social/tags/include" class="mention hashtag" rel="nofollow noopener" target="_blank">#include</a> <stdio.h>int main(void) { printf("%d\n", 100 + 200); return 0; }2024-{07-04} Day{10} <a href="https://ruby.social/tags/100DaysOfCode" class="mention hashtag" rel="nofollow noopener" target="_blank">#100DaysOfCode</a>

hyumanase<a href="https://ruby.social/tags/include" class="mention hashtag" rel="nofollow noopener" target="_blank">#include</a> <stdio.h> <a href="https://ruby.social/tags/include" class="mention hashtag" rel="nofollow noopener" target="_blank">#include</a> <stdlib.h> int main(void) { int a, b, c, x; printf("1 から 100 までの整数を１つ考えてください.\n"); printf("それを 3 で割った余り? "); scanf("%d", &a); printf("それを 5 で割った余り? "); scanf("%d", &b); printf("それを 7 で割った余り? "); scanf("%d", &c); x = (70 * a + 21 * b + 15 * c) % 105; printf("あなたの考えた数は %d でしょう!\n", x); return 0; }2024-{07-02} Day{9} <a href="https://ruby.social/tags/100DaysOfCode" class="mention hashtag" rel="nofollow noopener" target="_blank">#100DaysOfCode</a>

hyumanase<a href="https://ruby.social/tags/include" class="mention hashtag" rel="nofollow noopener" target="_blank">#include</a> <stdio.h> int main(void){ int numbar = 100; printf("%d monsters draw near!", numbar); }2024-{06-30} Day{8} <a href="https://ruby.social/tags/100DaysOfCode" class="mention hashtag" rel="nofollow noopener" target="_blank">#100DaysOfCode</a>

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