Remove plenty of makefile misconfigurations

tool/build/dd.c

@@ -0,0 +1,160 @@
+/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
+│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
+╞══════════════════════════════════════════════════════════════════════════════╡
+│ Copyright 2022 Justine Alexandra Roberts Tunney                              │
+│                                                                              │
+│ Permission to use, copy, modify, and/or distribute this software for         │
+│ any purpose with or without fee is hereby granted, provided that the         │
+│ above copyright notice and this permission notice appear in all copies.      │
+│                                                                              │
+│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
+│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
+│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
+│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
+│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
+│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
+│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
+│ PERFORMANCE OF THIS SOFTWARE.                                                │
+╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/bits/safemacros.internal.h"
+#include "libc/calls/calls.h"
+#include "libc/errno.h"
+#include "libc/fmt/conv.h"
+#include "libc/limits.h"
+#include "libc/runtime/runtime.h"
+#include "libc/stdio/stdio.h"
+#include "libc/str/str.h"
+#include "libc/sysv/consts/o.h"
+
+char buf[65536];
+
+wontreturn void SysFail(const char *func, const char *file) {
+  int e = errno;
+  fputs("dd: ", stderr);
+  fputs(func, stderr);
+  fputs(" failed: ", stderr);
+  fputs(file, stderr);
+  fputs(": ", stderr);
+  fputs(nulltoempty(strerdoc(e)), stderr);
+  fputs("\n", stderr);
+  exit(__COUNTER__ + 1);
+}
+
+int main(int argc, char *argv[]) {
+  long i;
+  char *p;
+  long skip = 0;
+  long count = LONG_MAX;
+  long blocksize = 1;
+  int oflags = O_WRONLY | O_TRUNC | O_CREAT;
+  const char *infile = "/dev/stdin";
+  const char *oufile = "/dev/stdout";
+
+  for (i = 1; i < argc; ++i) {
+
+    if (argv[i][0] == 'b' &&  //
+        argv[i][1] == 's' &&  //
+        argv[i][2] == '=') {
+      blocksize = strtol(argv[i] + 3 + (argv[i][3] == '"'), 0, 10);
+      if (!(0 < blocksize && blocksize <= sizeof(buf))) {
+        fputs("dd: bad block size\n", stderr);
+        return __COUNTER__ + 1;
+      }
+
+    } else if (argv[i][0] == 'i' &&  //
+               argv[i][1] == 'f' &&  //
+               argv[i][2] == '=') {
+      infile = argv[i] + 3 + (argv[i][3] == '"');
+      p = strchr(infile, '"');
+      if (p) *p = 0;
+
+    } else if (argv[i][0] == 'o' &&  //
+               argv[i][1] == 'f' &&  //
+               argv[i][2] == '=') {
+      oufile = argv[i] + 3 + (argv[i][3] == '"');
+      p = strchr(infile, '"');
+      if (p) *p = 0;
+
+    } else if (argv[i][0] == 's' &&  //
+               argv[i][1] == 'k' &&  //
+               argv[i][2] == 'i' &&  //
+               argv[i][3] == 'p' &&  //
+               argv[i][4] == '=') {
+      count = strtol(argv[i] + 5 + (argv[i][5] == '"'), 0, 10);
+      if (!(skip < 0)) {
+        fputs("dd: bad skip\n", stderr);
+        return __COUNTER__ + 1;
+      }
+
+    } else if (argv[i][0] == 'c' &&  //
+               argv[i][1] == 'o' &&  //
+               argv[i][2] == 'u' &&  //
+               argv[i][3] == 'n' &&  //
+               argv[i][4] == 't' &&  //
+               argv[i][5] == '=') {
+      count = strtol(argv[i] + 6 + (argv[i][6] == '"'), 0, 10);
+      if (!(count < 0)) {
+        fputs("dd: bad count\n", stderr);
+        return __COUNTER__ + 1;
+      }
+
+    } else if (!strcmp(argv[i], "conv=notrunc")) {
+      oflags &= ~O_TRUNC;
+
+    } else {
+      fputs("dd: unrecognized arg: ", stderr);
+      fputs(argv[i], stderr);
+      fputs("\n", stderr);
+      return __COUNTER__ + 1;
+    }
+  }
+
+  ssize_t rc;
+  int fdin, fdout;
+
+  if ((fdin = open(infile, O_RDONLY)) == -1) {
+    SysFail("open", infile);
+  }
+
+  if ((fdout = open(oufile, oflags, 0644)) == -1) {
+    SysFail("open", oufile);
+  }
+
+  if (skip) {
+    if (lseek(fdin, skip, SEEK_SET) == -1) {
+      SysFail("lseek", infile);
+    }
+  }
+
+  for (i = 0; i < count; ++i) {
+
+    rc = read(fdin, buf, blocksize);
+    if (rc == -1) {
+      SysFail("read", infile);
+    }
+    if (rc != blocksize) {
+      int e = errno;
+      fputs("dd: failed to read blocksize: ", stderr);
+      fputs(infile, stderr);
+      fputs("\n", stderr);
+      return __COUNTER__ + 1;
+    }
+
+    rc = write(fdout, buf, blocksize);
+    if (rc == -1) {
+      SysFail("write", oufile);
+    }
+    if (rc != blocksize) {
+      int e = errno;
+      fputs("dd: failed to write blocksize: ", stderr);
+      fputs(infile, stderr);
+      fputs("\n", stderr);
+      return __COUNTER__ + 1;
+    }
+  }
+
+  if (close(fdin) == -1) SysFail("close", infile);
+  if (close(fdout) == -1) SysFail("close", oufile);
+
+  return 0;
+}