Testprogramm für Hash-Tabellen, 5.5.2022

20220505/gen-hash-test-dat.sh

+#!/bin/sh
+
+counter=$(wc -l hash-test.dat | cut -d " " -f 1)
+n=$((10000 - counter))
+
+pwgen -N $n 32 \
+ | while read s; do
+     counter=$((counter + 1))
+     echo $counter $s
+   done

20220505/hash-map-test-01.c

+#include <stdio.h>
+#include <errno.h>
+#include <error.h>
+#include <string.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+const int ERROR = -1;
+const int size = 1117;
+const int bufsize = 100;
+
+int n[size];  // zunächst: alle 0
+const char *check[size];  // zunächst: alle NULL
+
+constexpr int hash (const char *name)
+{
+  // Cantor pairing function
+  uint8_t n0 = name ? name[0] : 0;
+  uint8_t n1 = n0 ? name[1] : 0;
+  uint8_t n2 = n1 ? name[2] : 0;
+  return ((n0 + n1) / 2 * (n0 + n1 + 1) + n2) % size;
+}
+
+void put_number (const char *name, int value)
+{
+  int idx = hash (name);
+  if (check[idx] && strcmp (check[idx], name) != 0)
+    fprintf (stderr, "occupied: %s = %d\n", name, value);
+  else
+    {
+      check[idx] = name;
+      n[idx] = value;
+    }
+}
+
+int get_number (const char *name)
+{
+  int value = ERROR;
+  int idx = hash (name);
+  if (check[idx] && strcmp (check[idx], name) == 0)
+    value = n[idx];
+  else
+    fprintf (stderr, "not found: %s\n", name);
+  return value;
+}
+
+static void read_data (FILE *f, char **name, int *value)
+{
+  int v;
+  char buffer[bufsize];
+  fscanf (f, "%d", &v);
+  fgets (buffer, bufsize - 1, f);
+  int l = strlen (buffer);
+  if (l > 0 && buffer[l - 1] == '\n')
+    buffer[l - 1] = 0;
+  const char *n = buffer;
+  while (n[0] == ' ')
+    n++;
+  l = strlen (n);
+  if (*name == NULL)
+    *name = (char *) malloc (l);
+  strncpy (*name, n, l + 1);
+  *value = v;
+}
+
+int main (int argc, char **argv)
+{
+  const char *filename = "hash-test.dat";
+  if (argc > 1)
+    filename = argv[1];
+  FILE *f = fopen (filename, "r");
+  if (!f)
+    error (errno, errno, "cannot open file \"%s\"", filename);
+  while (!feof (f))
+    {
+      int value;
+      char *name = NULL;
+      read_data (f, &name, &value);
+      put_number (name, value);
+    }
+  rewind (f);
+  while (!feof (f))
+    {
+      int value;
+      char name[bufsize];
+      char *p = name;
+      read_data (f, &p, &value);
+      int v = get_number (name);
+      if (v != value)
+        printf ("%s: %d instead of %d\n", name, v, value);
+    }
+  fclose (f);
+  return 0;
+}

20220505/hash-test-100.dat

+1 Weifae2oolejez5johNgah9eiphie8su
+2 aex3Ceefosha6ooviu6theeFahk1ohpa
+3 Quiquurohcah2ahpheiMeciQui2uihoo
+4 ailiesoama6AhGhohweefae8ZauK3Zoo
+5 shahghi8shaetahnap3IiTheep4eewii
+6 eigiemota6Phoothohp0Aethai2oow7p
+7 deigho4Eapia1hutoh2Ith5kaxie1ahz
+8 lis0aeNgoang7heiPhemoo5Phoo4eigu
+9 ruFeoc0aixiphahYoTagh1ohNgoh7koo
+10 Wahqu0icee4iexooh6lu4ul2mahseaxa
+11 aite4aik3Xijusanguzaech6ahdo4coF
+12 Ne6iepaegh3coh7ohsh7phu3eevai7da
+13 kei7oe1WeeCeicifi9ie1Faes7poa4eu
+14 uud9vawies3AeK3ein7uezohD4dai3ow
+15 wuujeP6sooBij0aeniemohsheiZ9olon
+16 FaDiuVaa9quoh2veepho5jei0ush9vah
+17 Aht0sheenu3aghohZ2ChahquieTee4Fa
+18 hieFieph5Ohmaesee1ohdeiweizuoca8
+19 AiquuPae4roshochuoS5ieree0ada0Ae
+20 ahNeiChooghe6shies5ateiM4thu7Ivi
+21 umieciegei5ohsiakei2fo4Eiy5ahn2e
+22 yipheif3weB3eeshup5thai5seiseele
+23 waeghaidiSahwio8pu2kahf0vijong1S
+24 zuu0laiX9phohyah9Zosh5aek2quiBuw
+25 oja1aes5daeyah6ieph9EeGuoj2caimo
+26 hooth9aiGa1Cii1Ea3vahgaN8eeh7iew
+27 chas5luth2oodonahroh9eek2cieBaiM
+28 vooj0zae3yeebe1lei7Thuaph1eikiha
+29 pheiWohpoTah6zifoQueiph5Mooy2Ahr
+30 Ohvi4aucei7ahx5neereeg6se2Ath3ce
+31 eh2ohGh0aipu2jioxiethaiSuoxoogae
+32 ohjooDiet5ohpheshi1rieMut4queira
+33 Mah9Quah4NaeDoe7achie7ohy6uo1Zoh
+34 soos7giS3hohsuthooph9fazaeKaNguw
+35 laiNesh6miesahmohMooshoofaiphu5J
+36 iegh8pe6eethee5ahtaej1jiCh0iQuou
+37 Quabaesh1Si0iek5ahtoo5gee0thaebi
+38 oolaenosoxaKaov4xohTh3ohNgaisi0p
+39 aingee5moo7neesho2deiquooj1Ahtoh
+40 naVei0OngaeMu7oingaishaenai9jooz
+41 eej2OoseebaedeiShoob1jookoo2Shoh
+42 cie2thiushae2quu3shib3Uheer2Aesh
+43 ooSheehait2ohthiebeikagh5eeJiedi
+44 goopu2es3oophaegh7Aekeebohxie2az
+45 queiLeelu2fahk1oc7tiexiuSuoph2ie
+46 eiYeefooleefah7EiW6theoghaeZii4i
+47 aesedaelohshomeiy6Naemah8peQu6Ei
+48 naebaiphueNgoo1aeWu3aiGh3goo9eet
+49 feiju3DudievaogiYeeC9Ceiphouv1ko
+50 ushi0aip3uuNgoh0aeS6thei7oo1chai
+51 ahw6voongoj9eehae4VieChu5eephoop
+52 coovahu4oozuud5ceeb4Fai9eev0uguu
+53 eThai2ohGoht5ahpae5Rio4uT1sieShe
+54 ohVeg8mie3oeNaeCucae2uyaiKaepah7
+55 laiBae2iebabee7eeciez2ohngieJej8
+56 of2eec9ahg6daecheeshahPeibea1eib
+57 oosheikaiMaejieho7Ahr6lohgheer8U
+58 Autaepuu8Enei0ohtool2UbuRa0oobig
+59 Xeejei7ahw1ohSae2quai8wieGhahdoh
+60 ieCh1OhfooKei8Juxohng8Yahla7naed
+61 cae4shaid1Iehaquaeshu2xooK4fai1o
+62 iGh2ahphai8ohphoshuo5maiphi7thuf
+63 QuoeshungaesohbieFuz0mie3aPhiex5
+64 ob4Kephootheeph6daelohlope5nuada
+65 ohfailophu2pei8FailosaiY9Cange7r
+66 queHaip5foh1oozix5oopo9uyuiD2kei
+67 zei5sah2eep8ooN3ieshu0au6eiTe9ke
+68 Awita5upe1Eiciephiew1eiri6uKieke
+69 pai0weiCh7chugooz2aingieviechoo6
+70 joaPhohceez1eingae2saesh6aehaen3
+71 aey6kohveuphiethooki6chaigahChoh
+72 ueseex8osheiweeXe8chiesh3ti8keeb
+73 vieKie9eo2Ro1aingoobohwos5Xeeluu
+74 ahshu3phaiBoo6uquoov1Zi7xa9yoh9c
+75 Su6booWevaekonone6uedaeShee9Thee
+76 AhCheebaecoh5ahshaigeepeiN1borih
+77 uv3cu8ohmuilo2ool3fecie3naef6Am8
+78 feiTechei5AhGhah3ubuM0saesh6eeg4
+79 at2Ihe0de7eikoo0pei8Aingipe5deti
+80 cohpeu2eiGhai3eiNgu2aelooteesagh
+81 zahsee4ooyeik0aesh2pohm7AeJu8aej
+82 ohDae9vaibi6quie7ue8bienootheipo
+83 Ego3so5ahs2eree0ahlait7eu4aazeey
+84 aibeithafe8Quaghu2xah5aew0Ier9ah
+85 oebe2geezohgeo0AVuGh1uth6iv1keik
+86 ieS2beiyahthei9ohJ6lok9XohKohbae
+87 leepeigheeGa5eiThoadee8soh0ohPhe
+88 sohxae9cethoh2aeW5Shaeth1Ohthoh5
+89 Nu5aemiNgu6Iev5pohYooshai2ci7ier
+90 dei5eechaVeim7dethaz0ha2neipoo3n
+91 eoxoJaaxah3naeZ6Cieghiobeip8aing
+92 uuneek9aef2yaifa9eShaethaexi6yae
+93 uereeloh5ozu9etahCha4oe4joonai2e
+94 sooqu8pahDeinaidaingohghaeDichei
+95 Aiquaed5aiNeyaek8heiyoh4chah3ao5
+96 eemoh7noo0eijaGhohReewaej3say4bi
+97 fai9eixai7Moko6okoh7oogeeCha5Ooy
+98 thoo7Eic2quahwagoaXeeha0aitholoo
+99 Oofoh1ohjexu9axaex0iebua5ohdahCh
+100 ne7ee0aev1oopha3eem7xee9mee6quuG