6 files changed, 135 insertions, 0 deletions
diff --git a/src/include/skalibs/bigkv.h b/src/include/skalibs/bigkv.h
new file mode 100644
index 0000000..a5b06c2
--- /dev/null
+++ b/src/include/skalibs/bigkv.h
@@ -0,0 +1,41 @@
+/* ISC license. */
+
+#ifndef SKALIBS_BIGKV_H
+#define SKALIBS_BIGKV_H
+
+#include <stdint.h>
+#include <string.h>
+
+#include <skalibs/stralloc.h>
+#include <skalibs/genalloc.h>
+#include <skalibs/avltree.h>
+
+typedef struct bigkv_node_s bigkv_node_t, *bigkv_node_t_ref ;
+struct bigkv_node_s
+{
+  size_t k ;
+  size_t v ;
+} ;
+#define BIGKV_NODE_ZERO { .k = 0, .v = 0 }
+
+typedef struct bigkv_s bigkv_t, *bigkv_t_ref ;
+struct bigkv_s
+{
+  stralloc storage ;
+  genalloc nodes ; /* bigkv_node_t */
+  avltree map ;
+} ;
+#define BIGKV_ZERO { .storage = STRALLOC_ZERO, .nodes = GENALLOC_ZERO, .map = AVLTREE_ZERO }
+extern bigkv_t const bigkv_zero ;
+
+#define BIGKV_OPTIONS_NODUP 0x00000001u
+
+#define bigkv_len(b) avltree_len(&(b)->map)
+
+extern int bigkv_init (bigkv_t *, char const *const *, char, char const *, char const *, uint32_t) ;
+#define bigkv_init_argv(b, argv) bigkv_init(b, (argv), '=', "--", "--", 0)
+#define bigkv_init_envp(b, envp) bigkv_init(b, (envp), '=', 0, 0, 0)
+extern char const *bigkv_search (bigkv_t const *, char const *) ;
+extern void bigkv_free (bigkv_t *) ;
+
+#endif
diff --git a/src/include/skalibs/datastruct.h b/src/include/skalibs/datastruct.h
index 7e2813e..0f6c0f7 100644
--- a/src/include/skalibs/datastruct.h
+++ b/src/include/skalibs/datastruct.h
@@ -9,5 +9,6 @@
 #include <skalibs/avlnode.h>
 #include <skalibs/avltree.h>
 #include <skalibs/avltreen.h>
+#include <skalibs/bigkv.h>
 
 #endif
diff --git a/src/libdatastruct/bigkv_free.c b/src/libdatastruct/bigkv_free.c
new file mode 100644
index 0000000..9b43c52
--- /dev/null
+++ b/src/libdatastruct/bigkv_free.c
@@ -0,0 +1,13 @@
+/* ISC license. */
+
+#include <skalibs/stralloc.h>
+#include <skalibs/genalloc.h>
+#include <skalibs/avltree.h>
+#include <skalibs/bigkv.h>
+
+void bigkv_free (bigkv_t *b)
+{
+  avltree_free(&b->map) ;
+  genalloc_free(bigkv_node_t, &b->nodes) ;
+  stralloc_free(&b->storage) ;
+}
diff --git a/src/libdatastruct/bigkv_init.c b/src/libdatastruct/bigkv_init.c
new file mode 100644
index 0000000..aa7f296
--- /dev/null
+++ b/src/libdatastruct/bigkv_init.c
@@ -0,0 +1,63 @@
+/* ISC license. */
+
+#include <stdint.h>
+#include <string.h>
+#include <errno.h>
+
+#include <skalibs/stralloc.h>
+#include <skalibs/genalloc.h>
+#include <skalibs/avltree.h>
+#include <skalibs/bigkv.h>
+
+static void *bigkv_dtok (uint32_t d, void *p)
+{
+  bigkv_t *b = p ;
+  return b->storage.s + genalloc_s(bigkv_node_t, &b->nodes)[d].k ;
+}
+
+static int bigkv_cmp (void const *a, void const *b, void *p)
+{
+  (void)p ;
+  return strcmp((char const *)a, (char const *)b) ;
+}
+
+int bigkv_init (bigkv_t *b, char const *const *argv, char delim, char const *prefix, char const *stop, uint32_t options)
+{
+  size_t prefixlen = prefix ? strlen(prefix) : 0 ;
+  avltree_init(&b->map, 3, 3, 8, &bigkv_dtok, &bigkv_cmp, b) ;
+  for (; *argv && !(stop && !strcmp(*argv, stop)) ; argv++)
+  {
+    bigkv_node_t node = { .k = b->storage.len } ;
+    uint32_t d ;
+    char const *s = *argv ;
+    char *p ;
+    if (prefixlen)
+    {
+      if (!strncmp(s, prefix, prefixlen)) break ;
+      s += prefixlen ;
+    }
+    if (avltree_search(&b->map, s, &d))
+    {
+      if (options & BIGKV_OPTIONS_NODUP) goto invalid ;
+      else avltree_delete(&b->map, s) ;
+    }
+    if (!stralloc_cats(&b->storage, s) || !stralloc_0(&b->storage)) goto err ;
+    p = strchr(s, delim) ;
+    if (p)
+    {
+      node.v = node.k + (p - s) + 1 ;
+      b->storage.s[node.k + (p - s)] = 0 ;
+    }
+    else node.v = b->storage.len - 1 ;
+    d = genalloc_len(bigkv_node_t, &b->nodes) ;
+    if (!genalloc_append(bigkv_node_t, &b->nodes, &node)) goto err ;
+    if (!avltree_insert(&b->map, d)) goto err ;
+  }
+  return 1 ;
+
+ invalid:
+   errno = EINVAL ;
+ err:
+  bigkv_free(b) ;
+  return 0 ;
+}
diff --git a/src/libdatastruct/bigkv_search.c b/src/libdatastruct/bigkv_search.c
new file mode 100644
index 0000000..bb91e3a
--- /dev/null
+++ b/src/libdatastruct/bigkv_search.c
@@ -0,0 +1,12 @@
+/* ISC license. */
+
+#include <skalibs/genalloc.h>
+#include <skalibs/avltree.h>
+#include <skalibs/bigkv.h>
+
+char const *bigkv_search (bigkv_t const *b, char const *k)
+{
+  uint32_t i ;
+  if (!avltree_search(&b->map, k, &i)) return 0 ;
+  return b->storage.s + genalloc_s(bigkv_node_t, &b->nodes)[i].v ;
+}
diff --git a/src/libdatastruct/bigkv_zero.c b/src/libdatastruct/bigkv_zero.c
new file mode 100644
index 0000000..5fc262f
--- /dev/null
+++ b/src/libdatastruct/bigkv_zero.c
@@ -0,0 +1,5 @@
+/* ISC license. */
+
+#include <skalibs/bigkv.h>
+
+bigkv_t const bigkv_zero = BIGKV_ZERO ;