Make redbean serialization deterministic

libc/stdio/strlist.c

@@ -0,0 +1,80 @@
+/*-*- 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/alg/alg.h"
+#include "libc/stdio/append.internal.h"
+#include "libc/stdio/strlist.internal.h"
+#include "libc/str/str.h"
+
+static int CompareStrings(const void *p1, const void *p2) {
+  const char **a = p1;
+  const char **b = p2;
+  return strcmp(*a, *b);
+}
+
+void FreeStrList(struct StrList *sl) {
+  int i;
+  for (i = 0; i < sl->i; ++i) {
+    free(sl->p[i]);
+  }
+  free(sl->p);
+  sl->p = 0;
+  sl->i = 0;
+  sl->n = 0;
+}
+
+int AppendStrList(struct StrList *sl) {
+  int n2;
+  char **p2;
+  if (sl->i == sl->n) {
+    n2 = sl->n;
+    if (!n2) n2 = 2;
+    n2 += n2 >> 1;
+    if ((p2 = realloc(sl->p, n2 * sizeof(*p2)))) {
+      sl->p = p2;
+      sl->n = n2;
+    } else {
+      return -1;
+    }
+  }
+  sl->p[sl->i] = 0;
+  appendr(&sl->p[sl->i], 0);
+  return sl->i++;
+}
+
+void SortStrList(struct StrList *sl) {
+  qsort(sl->p, sl->i, sizeof(*sl->p), CompareStrings);
+}
+
+int JoinStrList(struct StrList *sl, char **buf, uint64_t sep) {
+  int i;
+  if (!*buf && !sl->i) {
+    return appendr(buf, 0);
+  }
+  for (i = 0; i < sl->i; ++i) {
+    if (i) {
+      if (appendw(buf, sep) == -1) {
+        return -1;
+      }
+    }
+    if (appends(buf, sl->p[i]) == -1) {
+      return -1;
+    }
+  }
+  return 0;
+}

libc/stdio/strlist.internal.h

@@ -0,0 +1,18 @@
+#ifndef COSMOPOLITAN_LIBC_STDIO_STRLIST_H_
+#define COSMOPOLITAN_LIBC_STDIO_STRLIST_H_
+#if !(__ASSEMBLER__ + __LINKER__ + 0)
+COSMOPOLITAN_C_START_
+
+struct StrList {
+  int i, n;
+  char **p;
+};
+
+void FreeStrList(struct StrList *) hidden;
+int AppendStrList(struct StrList *) hidden;
+void SortStrList(struct StrList *) hidden;
+int JoinStrList(struct StrList *, char **, uint64_t) hidden;
+
+COSMOPOLITAN_C_END_
+#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
+#endif /* COSMOPOLITAN_LIBC_STDIO_STRLIST_H_ */