Work towards improving signals and processes

libc/str/iconv.c

@@ -0,0 +1,33 @@
+/*-*- 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 2021 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/str/str.h"
+
+typedef void *iconv_t;
+
+iconv_t iconv_open(const char *to, const char *from) {
+  return NULL;
+}
+
+int iconv_close(iconv_t cd) {
+  return -1;
+}
+
+size_t iconv(iconv_t cd, char **in, size_t *inb, char **out, size_t *outb) {
+  return -1;
+}

libc/str/str.h

@@ -169,6 +169,7 @@ bool endswith(const char *, const char *) strlenesque;
 bool endswith16(const char16_t *, const char16_t *) strlenesque;
 bool wcsendswith(const wchar_t *, const wchar_t *) strlenesque;
 const char *IndexDoubleNulString(const char *, unsigned) strlenesque;
+int strverscmp(const char *, const char *);
 wchar_t *wmemset(wchar_t *, wchar_t, size_t) memcpyesque;
 char16_t *memset16(char16_t *, char16_t, size_t) memcpyesque;
 compatfn wchar_t *wmemcpy(wchar_t *, const wchar_t *, size_t) memcpyesque;

libc/str/strverscmp.c

@@ -0,0 +1,71 @@
+/*-*- 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│
+╚──────────────────────────────────────────────────────────────────────────────╝
+│                                                                              │
+│  Musl Libc                                                                   │
+│  Copyright © 2005-2014 Rich Felker, et al.                                   │
+│                                                                              │
+│  Permission is hereby granted, free of charge, to any person obtaining       │
+│  a copy of this software and associated documentation files (the             │
+│  "Software"), to deal in the Software without restriction, including         │
+│  without limitation the rights to use, copy, modify, merge, publish,         │
+│  distribute, sublicense, and/or sell copies of the Software, and to          │
+│  permit persons to whom the Software is furnished to do so, subject to       │
+│  the following conditions:                                                   │
+│                                                                              │
+│  The above copyright notice and this permission notice shall be              │
+│  included in all copies or substantial portions of the Software.             │
+│                                                                              │
+│  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,             │
+│  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF          │
+│  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.      │
+│  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY        │
+│  CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,        │
+│  TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE           │
+│  SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                      │
+│                                                                              │
+╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/str/str.h"
+
+asm(".ident\t\"\\n\\n\
+Musl libc (MIT License)\\n\
+Copyright 2005-2014 Rich Felker, et. al.\"");
+asm(".include \"libc/disclaimer.inc\"");
+
+/**
+ * Compares two version strings.
+ */
+int strverscmp(const char *l0, const char *r0) {
+  const unsigned char *l = (const void *)l0;
+  const unsigned char *r = (const void *)r0;
+  size_t i, dp, j;
+  int z = 1;
+  /* Find maximal matching prefix and track its maximal digit
+   * suffix and whether those digits are all zeros. */
+  for (dp = i = 0; l[i] == r[i]; i++) {
+    int c = l[i];
+    if (!c) return 0;
+    if (!isdigit(c)) {
+      dp = i + 1, z = 1;
+    } else if (c != '0') {
+      z = 0;
+    }
+  }
+  if (l[dp] != '0' && r[dp] != '0') {
+    /* If we're not looking at a digit sequence that began
+     * with a zero, longest digit string is greater. */
+    for (j = i; isdigit(l[j]); j++) {
+      if (!isdigit(r[j])) {
+        return 1;
+      }
+    }
+    if (isdigit(r[j])) {
+      return -1;
+    }
+  } else if (z && dp < i && (isdigit(l[i]) || isdigit(r[i]))) {
+    /* Otherwise, if common prefix of digit sequence is
+     * all zeros, digits order less than non-digits. */
+    return (unsigned char)(l[i] - '0') - (unsigned char)(r[i] - '0');
+  }
+  return l[i] - r[i];
+}