From 28ea73301e080861b9f4980a63954a7ba4ad2fcb Mon Sep 17 00:00:00 2001
From: Yves Rutschle <git1@rutschle.net>
Date: Sun, 22 Jun 2025 16:45:50 +0200
Subject: [PATCH] new gap feature: hardlimit, with test suite

---
 gap.c                         |   14 +-
 gap.h                         |    9 +-
 testgap/Makefile              |    7 +
 testgap/gtest.c               |  102 +++
 testgap/hardlimit.tst         |   11 +
 testgap/hardlimit.tst.ref     |  514 +++++++++++
 testgap/insert_extend.tst     |    5 +
 testgap/insert_extend.tst.ref | 1538 +++++++++++++++++++++++++++++++++
 testgap/inserts.tst           |    6 +
 testgap/inserts.tst.ref       |  514 +++++++++++
 testgap/remove.tst            |   10 +
 testgap/remove.tst.ref        |  514 +++++++++++
 testgap/run                   |   30 +
 13 files changed, 3272 insertions(+), 2 deletions(-)
 create mode 100644 testgap/Makefile
 create mode 100644 testgap/gtest.c
 create mode 100644 testgap/hardlimit.tst
 create mode 100644 testgap/hardlimit.tst.ref
 create mode 100644 testgap/insert_extend.tst
 create mode 100644 testgap/insert_extend.tst.ref
 create mode 100644 testgap/inserts.tst
 create mode 100644 testgap/inserts.tst.ref
 create mode 100644 testgap/remove.tst
 create mode 100644 testgap/remove.tst.ref
 create mode 100755 testgap/run

diff --git a/gap.c b/gap.c
index 3b3f98c..39d2e63 100644
--- a/gap.c
+++ b/gap.c
@@ -59,6 +59,11 @@ gap_array* gap_init(int len)
     return gap;
 }
 
+void gap_set_hardlimit(gap_array* gap, int index)
+{
+    gap->hardlimit = index;
+}
+
 int gap_extend(gap_array* gap)
 {
     int elem_size = sizeof(gap->array[0]);
@@ -88,7 +93,11 @@ void gap_destroy(gap_array* gap)
  * is considered len elements long.
  * A poor man's list, if you will. Currently only used to remove probing
  * connections, so it only copies a few pointers at most.
- * Returns -1 if ptr was not found */
+ * Returns:
+ * -1 if ptr was not found 
+ * -2 if `len` is inconsistent with gap->len (i.e. trying to shift beyond the
+ * end of the array)
+ * */
 int gap_remove_ptr(gap_array* gap, void* ptr, int len)
 {
     int start, i;
@@ -102,6 +111,9 @@ int gap_remove_ptr(gap_array* gap, void* ptr, int len)
     else
         return -1;
 
+    if (gap->len < len)
+        return -2;
+
     for (i = start; i < len - 1; i++) {
         gap->array[i] = gap->array[i+1];
     }
diff --git a/gap.h b/gap.h
index 26690a6..aab6005 100644
--- a/gap.h
+++ b/gap.h
@@ -4,6 +4,7 @@
 typedef struct gap_array gap_array;
 
 gap_array* gap_init(int len);
+void gap_set_hardlimit(gap_array* ga, int index);
 static void* gap_get(gap_array* gap, int index);
 static int gap_set(gap_array* gap, int index, void* ptr);
 void gap_destroy(gap_array* gap);
@@ -13,7 +14,8 @@ int gap_remove_ptr(gap_array* gap, void* ptr, int len);
 /* Private declarations to allow inlining.
  * Don't assume my implementation. */
 typedef struct gap_array {
-    int len; /* Number of elements in array */
+    int len; /* Number of elements in array (corresponds to the number of pages allocated) */
+    int hardlimit; /* Maximum index allowed after which sets will fail; 0 means no limit */
     void** array;
 } gap_array;
 
@@ -21,6 +23,9 @@ int gap_extend(gap_array* gap);
 
 static inline int __attribute__((unused)) gap_set(gap_array* gap, int index, void* ptr)
 {
+    if (gap->hardlimit && (index > gap->hardlimit))
+        return -1;
+
     while (index >= gap->len) {
         int res = gap_extend(gap);
         if (res == -1) return -1;
@@ -37,6 +42,8 @@ static inline void* __attribute__((unused)) gap_get(gap_array* gap, int index)
      * gap_get()'s job. This will do for now */
     if (index >= gap->len) return NULL;
 
+    if (gap->hardlimit && (index > gap->hardlimit)) return NULL;
+
     return gap->array[index];
 }
 
diff --git a/testgap/Makefile b/testgap/Makefile
new file mode 100644
index 0000000..28c24f4
--- /dev/null
+++ b/testgap/Makefile
@@ -0,0 +1,7 @@
+
+CFLAGS=-DHASH_TESTING -O2 -Wall
+OBJ=../gap.o gtest.o
+
+gtest: $(OBJ)
+	$(CC) -o gtest $(OBJ)
+
diff --git a/testgap/gtest.c b/testgap/gtest.c
new file mode 100644
index 0000000..18c76a3
--- /dev/null
+++ b/testgap/gtest.c
@@ -0,0 +1,102 @@
+/* Wee testing program from the gap code, this is very similar to the hash
+ * testing code.
+ * Instead of pointers, we use integers
+ *
+ * script language:
+ * a 5 12     # adds value 12 at index 5
+ * d 512 42   # remove value 42, 512 is the length of the array
+ * h 16 0     # set hard limit to 16 (value is not used)
+ */
+
+
+#include <stdlib.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <string.h>
+
+
+
+#include "../gap.h"
+
+static void gtest_next_line(FILE* f, char* action, int* index, void** value)
+{
+
+    int res = 0;
+    while ((res != 3) && (res != EOF))
+        res = fscanf(f, "%c %d %p\n", action, index, value);
+    if (res == EOF) exit(0);
+}
+
+static void gap_dump(gap_array* gap, char* filename)
+{
+    int i;
+    FILE* out = fopen(filename, "w");
+
+    if (!out) {
+        perror(filename);
+        exit(1);
+    }
+
+    fprintf(out, "<gap len=%d hardlimit=%d>\n", gap->len, gap->hardlimit);
+    for (i = 0; i < gap->len; i++) {
+        void* value = gap_get(gap, i);
+        fprintf(out, "[%d] = %p\n", i, value);
+    }
+    fprintf(out, "</gap>\n");
+    fclose(out);
+}
+
+
+int main(int argc, char* argv[])
+{
+    gap_array* gap = gap_init(0);
+    char action;
+    int line = 0, index;
+    void* value;
+    FILE* f;
+
+    if (argc != 3) {
+        fprintf(stderr, "Usage: gtest <script file> <dump file>\n");
+        exit(1);
+    }
+    char* script_file = argv[1];
+    char* dump_file = argv[2];
+    f = fopen(argv[1], "r");
+    if (!f) {
+        perror(script_file);
+        exit(1);
+    }
+
+    while (1) {
+        action = ' ';
+
+        line++;
+        gtest_next_line(f, &action, &index, &value);
+        fprintf(stderr, "action %d: %c %d %p\n", line, action, index, value);
+
+        switch (action) {
+        case 'a': /* add */
+            fprintf(stderr, "[%d] = %p\n", index, value);
+            gap_set(gap, index, value);
+            break;
+
+        case 'd': /* del */
+            fprintf(stderr, "removing %p\n", value);
+            int res = gap_remove_ptr(gap, (void*)value, index);
+            fprintf(stderr, "remove: %d\n", res);
+            break;
+
+        case 'h': /* hardlimit */
+            fprintf(stderr, "setting hard limit %d\n", index);
+            gap_set_hardlimit(gap, index);
+
+        case 'g': /* get */
+            fprintf(stderr, "searching\n");
+            value = gap_get(gap, index);
+            fprintf(stderr, "got [%d]= %p\n", index, value);
+            break;
+        }
+        gap_dump(gap, dump_file);
+    }
+    return 0;
+}
diff --git a/testgap/hardlimit.tst b/testgap/hardlimit.tst
new file mode 100644
index 0000000..e7294f1
--- /dev/null
+++ b/testgap/hardlimit.tst
@@ -0,0 +1,11 @@
+
+# Test hard limit
+
+h 15 0  # set hard limit
+a 5 42
+a 6 43
+a 15 44
+a 16 45
+a 17 46
+
+
diff --git a/testgap/hardlimit.tst.ref b/testgap/hardlimit.tst.ref
new file mode 100644
index 0000000..ef44536
--- /dev/null
+++ b/testgap/hardlimit.tst.ref
@@ -0,0 +1,514 @@
+<gap len=512 hardlimit=15>
+[0] = (nil)
+[1] = (nil)
+[2] = (nil)
+[3] = (nil)
+[4] = (nil)
+[5] = 0x42
+[6] = 0x43
+[7] = (nil)
+[8] = (nil)
+[9] = (nil)
+[10] = (nil)
+[11] = (nil)
+[12] = (nil)
+[13] = (nil)
+[14] = (nil)
+[15] = 0x44
+[16] = (nil)
+[17] = (nil)
+[18] = (nil)
+[19] = (nil)
+[20] = (nil)
+[21] = (nil)
+[22] = (nil)
+[23] = (nil)
+[24] = (nil)
+[25] = (nil)
+[26] = (nil)
+[27] = (nil)
+[28] = (nil)
+[29] = (nil)
+[30] = (nil)
+[31] = (nil)
+[32] = (nil)
+[33] = (nil)
+[34] = (nil)
+[35] = (nil)
+[36] = (nil)
+[37] = (nil)
+[38] = (nil)
+[39] = (nil)
+[40] = (nil)
+[41] = (nil)
+[42] = (nil)
+[43] = (nil)
+[44] = (nil)
+[45] = (nil)
+[46] = (nil)
+[47] = (nil)
+[48] = (nil)
+[49] = (nil)
+[50] = (nil)
+[51] = (nil)
+[52] = (nil)
+[53] = (nil)
+[54] = (nil)
+[55] = (nil)
+[56] = (nil)
+[57] = (nil)
+[58] = (nil)
+[59] = (nil)
+[60] = (nil)
+[61] = (nil)
+[62] = (nil)
+[63] = (nil)
+[64] = (nil)
+[65] = (nil)
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+[70] = (nil)
+[71] = (nil)
+[72] = (nil)
+[73] = (nil)
+[74] = (nil)
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+[78] = (nil)
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+[80] = (nil)
+[81] = (nil)
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+[84] = (nil)
+[85] = (nil)
+[86] = (nil)
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+[123] = (nil)
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+[126] = (nil)
+[127] = (nil)
+[128] = (nil)
+[129] = (nil)
+[130] = (nil)
+[131] = (nil)
+[132] = (nil)
+[133] = (nil)
+[134] = (nil)
+[135] = (nil)
+[136] = (nil)
+[137] = (nil)
+[138] = (nil)
+[139] = (nil)
+[140] = (nil)
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+[280] = (nil)
+[281] = (nil)
+[282] = (nil)
+[283] = (nil)
+[284] = (nil)
+[285] = (nil)
+[286] = (nil)
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+[426] = (nil)
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+[428] = (nil)
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+[430] = (nil)
+[431] = (nil)
+[432] = (nil)
+[433] = (nil)
+[434] = (nil)
+[435] = (nil)
+[436] = (nil)
+[437] = (nil)
+[438] = (nil)
+[439] = (nil)
+[440] = (nil)
+[441] = (nil)
+[442] = (nil)
+[443] = (nil)
+[444] = (nil)
+[445] = (nil)
+[446] = (nil)
+[447] = (nil)
+[448] = (nil)
+[449] = (nil)
+[450] = (nil)
+[451] = (nil)
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+[454] = (nil)
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+[456] = (nil)
+[457] = (nil)
+[458] = (nil)
+[459] = (nil)
+[460] = (nil)
+[461] = (nil)
+[462] = (nil)
+[463] = (nil)
+[464] = (nil)
+[465] = (nil)
+[466] = (nil)
+[467] = (nil)
+[468] = (nil)
+[469] = (nil)
+[470] = (nil)
+[471] = (nil)
+[472] = (nil)
+[473] = (nil)
+[474] = (nil)
+[475] = (nil)
+[476] = (nil)
+[477] = (nil)
+[478] = (nil)
+[479] = (nil)
+[480] = (nil)
+[481] = (nil)
+[482] = (nil)
+[483] = (nil)
+[484] = (nil)
+[485] = (nil)
+[486] = (nil)
+[487] = (nil)
+[488] = (nil)
+[489] = (nil)
+[490] = (nil)
+[491] = (nil)
+[492] = (nil)
+[493] = (nil)
+[494] = (nil)
+[495] = (nil)
+[496] = (nil)
+[497] = (nil)
+[498] = (nil)
+[499] = (nil)
+[500] = (nil)
+[501] = (nil)
+[502] = (nil)
+[503] = (nil)
+[504] = (nil)
+[505] = (nil)
+[506] = (nil)
+[507] = (nil)
+[508] = (nil)
+[509] = (nil)
+[510] = (nil)
+[511] = (nil)
+</gap>
diff --git a/testgap/insert_extend.tst b/testgap/insert_extend.tst
new file mode 100644
index 0000000..97922fb
--- /dev/null
+++ b/testgap/insert_extend.tst
@@ -0,0 +1,5 @@
+# Insertions after the first page, to extend the gap
+
+a 5 42
+a 1024 43
+a 1028 44
diff --git a/testgap/insert_extend.tst.ref b/testgap/insert_extend.tst.ref
new file mode 100644
index 0000000..8d04e63
--- /dev/null
+++ b/testgap/insert_extend.tst.ref
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+[1531] = (nil)
+[1532] = (nil)
+[1533] = (nil)
+[1534] = (nil)
+[1535] = (nil)
+</gap>
diff --git a/testgap/inserts.tst b/testgap/inserts.tst
new file mode 100644
index 0000000..ff7a8c9
--- /dev/null
+++ b/testgap/inserts.tst
@@ -0,0 +1,6 @@
+# Simple insertions in the first page
+
+a 5 42
+a 10 43
+
+
diff --git a/testgap/inserts.tst.ref b/testgap/inserts.tst.ref
new file mode 100644
index 0000000..f9e79db
--- /dev/null
+++ b/testgap/inserts.tst.ref
@@ -0,0 +1,514 @@
+<gap len=512 hardlimit=0>
+[0] = (nil)
+[1] = (nil)
+[2] = (nil)
+[3] = (nil)
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+[412] = (nil)
+[413] = (nil)
+[414] = (nil)
+[415] = (nil)
+[416] = (nil)
+[417] = (nil)
+[418] = (nil)
+[419] = (nil)
+[420] = (nil)
+[421] = (nil)
+[422] = (nil)
+[423] = (nil)
+[424] = (nil)
+[425] = (nil)
+[426] = (nil)
+[427] = (nil)
+[428] = (nil)
+[429] = (nil)
+[430] = (nil)
+[431] = (nil)
+[432] = (nil)
+[433] = (nil)
+[434] = (nil)
+[435] = (nil)
+[436] = (nil)
+[437] = (nil)
+[438] = (nil)
+[439] = (nil)
+[440] = (nil)
+[441] = (nil)
+[442] = (nil)
+[443] = (nil)
+[444] = (nil)
+[445] = (nil)
+[446] = (nil)
+[447] = (nil)
+[448] = (nil)
+[449] = (nil)
+[450] = (nil)
+[451] = (nil)
+[452] = (nil)
+[453] = (nil)
+[454] = (nil)
+[455] = (nil)
+[456] = (nil)
+[457] = (nil)
+[458] = (nil)
+[459] = (nil)
+[460] = (nil)
+[461] = (nil)
+[462] = (nil)
+[463] = (nil)
+[464] = (nil)
+[465] = (nil)
+[466] = (nil)
+[467] = (nil)
+[468] = (nil)
+[469] = (nil)
+[470] = (nil)
+[471] = (nil)
+[472] = (nil)
+[473] = (nil)
+[474] = (nil)
+[475] = (nil)
+[476] = (nil)
+[477] = (nil)
+[478] = (nil)
+[479] = (nil)
+[480] = (nil)
+[481] = (nil)
+[482] = (nil)
+[483] = (nil)
+[484] = (nil)
+[485] = (nil)
+[486] = (nil)
+[487] = (nil)
+[488] = (nil)
+[489] = (nil)
+[490] = (nil)
+[491] = (nil)
+[492] = (nil)
+[493] = (nil)
+[494] = (nil)
+[495] = (nil)
+[496] = (nil)
+[497] = (nil)
+[498] = (nil)
+[499] = (nil)
+[500] = (nil)
+[501] = (nil)
+[502] = (nil)
+[503] = (nil)
+[504] = (nil)
+[505] = (nil)
+[506] = (nil)
+[507] = (nil)
+[508] = (nil)
+[509] = (nil)
+[510] = (nil)
+[511] = (nil)
+</gap>
diff --git a/testgap/remove.tst b/testgap/remove.tst
new file mode 100644
index 0000000..e817f0f
--- /dev/null
+++ b/testgap/remove.tst
@@ -0,0 +1,10 @@
+# Remove values
+
+a 5 42
+a 10 43
+a 13 44
+a 510 45
+a 511 46
+
+d 512 43
+
diff --git a/testgap/remove.tst.ref b/testgap/remove.tst.ref
new file mode 100644
index 0000000..5fc4026
--- /dev/null
+++ b/testgap/remove.tst.ref
@@ -0,0 +1,514 @@
+<gap len=512 hardlimit=0>
+[0] = (nil)
+[1] = (nil)
+[2] = (nil)
+[3] = (nil)
+[4] = (nil)
+[5] = 0x42
+[6] = (nil)
+[7] = (nil)
+[8] = (nil)
+[9] = (nil)
+[10] = (nil)
+[11] = (nil)
+[12] = 0x44
+[13] = (nil)
+[14] = (nil)
+[15] = (nil)
+[16] = (nil)
+[17] = (nil)
+[18] = (nil)
+[19] = (nil)
+[20] = (nil)
+[21] = (nil)
+[22] = (nil)
+[23] = (nil)
+[24] = (nil)
+[25] = (nil)
+[26] = (nil)
+[27] = (nil)
+[28] = (nil)
+[29] = (nil)
+[30] = (nil)
+[31] = (nil)
+[32] = (nil)
+[33] = (nil)
+[34] = (nil)
+[35] = (nil)
+[36] = (nil)
+[37] = (nil)
+[38] = (nil)
+[39] = (nil)
+[40] = (nil)
+[41] = (nil)
+[42] = (nil)
+[43] = (nil)
+[44] = (nil)
+[45] = (nil)
+[46] = (nil)
+[47] = (nil)
+[48] = (nil)
+[49] = (nil)
+[50] = (nil)
+[51] = (nil)
+[52] = (nil)
+[53] = (nil)
+[54] = (nil)
+[55] = (nil)
+[56] = (nil)
+[57] = (nil)
+[58] = (nil)
+[59] = (nil)
+[60] = (nil)
+[61] = (nil)
+[62] = (nil)
+[63] = (nil)
+[64] = (nil)
+[65] = (nil)
+[66] = (nil)
+[67] = (nil)
+[68] = (nil)
+[69] = (nil)
+[70] = (nil)
+[71] = (nil)
+[72] = (nil)
+[73] = (nil)
+[74] = (nil)
+[75] = (nil)
+[76] = (nil)
+[77] = (nil)
+[78] = (nil)
+[79] = (nil)
+[80] = (nil)
+[81] = (nil)
+[82] = (nil)
+[83] = (nil)
+[84] = (nil)
+[85] = (nil)
+[86] = (nil)
+[87] = (nil)
+[88] = (nil)
+[89] = (nil)
+[90] = (nil)
+[91] = (nil)
+[92] = (nil)
+[93] = (nil)
+[94] = (nil)
+[95] = (nil)
+[96] = (nil)
+[97] = (nil)
+[98] = (nil)
+[99] = (nil)
+[100] = (nil)
+[101] = (nil)
+[102] = (nil)
+[103] = (nil)
+[104] = (nil)
+[105] = (nil)
+[106] = (nil)
+[107] = (nil)
+[108] = (nil)
+[109] = (nil)
+[110] = (nil)
+[111] = (nil)
+[112] = (nil)
+[113] = (nil)
+[114] = (nil)
+[115] = (nil)
+[116] = (nil)
+[117] = (nil)
+[118] = (nil)
+[119] = (nil)
+[120] = (nil)
+[121] = (nil)
+[122] = (nil)
+[123] = (nil)
+[124] = (nil)
+[125] = (nil)
+[126] = (nil)
+[127] = (nil)
+[128] = (nil)
+[129] = (nil)
+[130] = (nil)
+[131] = (nil)
+[132] = (nil)
+[133] = (nil)
+[134] = (nil)
+[135] = (nil)
+[136] = (nil)
+[137] = (nil)
+[138] = (nil)
+[139] = (nil)
+[140] = (nil)
+[141] = (nil)
+[142] = (nil)
+[143] = (nil)
+[144] = (nil)
+[145] = (nil)
+[146] = (nil)
+[147] = (nil)
+[148] = (nil)
+[149] = (nil)
+[150] = (nil)
+[151] = (nil)
+[152] = (nil)
+[153] = (nil)
+[154] = (nil)
+[155] = (nil)
+[156] = (nil)
+[157] = (nil)
+[158] = (nil)
+[159] = (nil)
+[160] = (nil)
+[161] = (nil)
+[162] = (nil)
+[163] = (nil)
+[164] = (nil)
+[165] = (nil)
+[166] = (nil)
+[167] = (nil)
+[168] = (nil)
+[169] = (nil)
+[170] = (nil)
+[171] = (nil)
+[172] = (nil)
+[173] = (nil)
+[174] = (nil)
+[175] = (nil)
+[176] = (nil)
+[177] = (nil)
+[178] = (nil)
+[179] = (nil)
+[180] = (nil)
+[181] = (nil)
+[182] = (nil)
+[183] = (nil)
+[184] = (nil)
+[185] = (nil)
+[186] = (nil)
+[187] = (nil)
+[188] = (nil)
+[189] = (nil)
+[190] = (nil)
+[191] = (nil)
+[192] = (nil)
+[193] = (nil)
+[194] = (nil)
+[195] = (nil)
+[196] = (nil)
+[197] = (nil)
+[198] = (nil)
+[199] = (nil)
+[200] = (nil)
+[201] = (nil)
+[202] = (nil)
+[203] = (nil)
+[204] = (nil)
+[205] = (nil)
+[206] = (nil)
+[207] = (nil)
+[208] = (nil)
+[209] = (nil)
+[210] = (nil)
+[211] = (nil)
+[212] = (nil)
+[213] = (nil)
+[214] = (nil)
+[215] = (nil)
+[216] = (nil)
+[217] = (nil)
+[218] = (nil)
+[219] = (nil)
+[220] = (nil)
+[221] = (nil)
+[222] = (nil)
+[223] = (nil)
+[224] = (nil)
+[225] = (nil)
+[226] = (nil)
+[227] = (nil)
+[228] = (nil)
+[229] = (nil)
+[230] = (nil)
+[231] = (nil)
+[232] = (nil)
+[233] = (nil)
+[234] = (nil)
+[235] = (nil)
+[236] = (nil)
+[237] = (nil)
+[238] = (nil)
+[239] = (nil)
+[240] = (nil)
+[241] = (nil)
+[242] = (nil)
+[243] = (nil)
+[244] = (nil)
+[245] = (nil)
+[246] = (nil)
+[247] = (nil)
+[248] = (nil)
+[249] = (nil)
+[250] = (nil)
+[251] = (nil)
+[252] = (nil)
+[253] = (nil)
+[254] = (nil)
+[255] = (nil)
+[256] = (nil)
+[257] = (nil)
+[258] = (nil)
+[259] = (nil)
+[260] = (nil)
+[261] = (nil)
+[262] = (nil)
+[263] = (nil)
+[264] = (nil)
+[265] = (nil)
+[266] = (nil)
+[267] = (nil)
+[268] = (nil)
+[269] = (nil)
+[270] = (nil)
+[271] = (nil)
+[272] = (nil)
+[273] = (nil)
+[274] = (nil)
+[275] = (nil)
+[276] = (nil)
+[277] = (nil)
+[278] = (nil)
+[279] = (nil)
+[280] = (nil)
+[281] = (nil)
+[282] = (nil)
+[283] = (nil)
+[284] = (nil)
+[285] = (nil)
+[286] = (nil)
+[287] = (nil)
+[288] = (nil)
+[289] = (nil)
+[290] = (nil)
+[291] = (nil)
+[292] = (nil)
+[293] = (nil)
+[294] = (nil)
+[295] = (nil)
+[296] = (nil)
+[297] = (nil)
+[298] = (nil)
+[299] = (nil)
+[300] = (nil)
+[301] = (nil)
+[302] = (nil)
+[303] = (nil)
+[304] = (nil)
+[305] = (nil)
+[306] = (nil)
+[307] = (nil)
+[308] = (nil)
+[309] = (nil)
+[310] = (nil)
+[311] = (nil)
+[312] = (nil)
+[313] = (nil)
+[314] = (nil)
+[315] = (nil)
+[316] = (nil)
+[317] = (nil)
+[318] = (nil)
+[319] = (nil)
+[320] = (nil)
+[321] = (nil)
+[322] = (nil)
+[323] = (nil)
+[324] = (nil)
+[325] = (nil)
+[326] = (nil)
+[327] = (nil)
+[328] = (nil)
+[329] = (nil)
+[330] = (nil)
+[331] = (nil)
+[332] = (nil)
+[333] = (nil)
+[334] = (nil)
+[335] = (nil)
+[336] = (nil)
+[337] = (nil)
+[338] = (nil)
+[339] = (nil)
+[340] = (nil)
+[341] = (nil)
+[342] = (nil)
+[343] = (nil)
+[344] = (nil)
+[345] = (nil)
+[346] = (nil)
+[347] = (nil)
+[348] = (nil)
+[349] = (nil)
+[350] = (nil)
+[351] = (nil)
+[352] = (nil)
+[353] = (nil)
+[354] = (nil)
+[355] = (nil)
+[356] = (nil)
+[357] = (nil)
+[358] = (nil)
+[359] = (nil)
+[360] = (nil)
+[361] = (nil)
+[362] = (nil)
+[363] = (nil)
+[364] = (nil)
+[365] = (nil)
+[366] = (nil)
+[367] = (nil)
+[368] = (nil)
+[369] = (nil)
+[370] = (nil)
+[371] = (nil)
+[372] = (nil)
+[373] = (nil)
+[374] = (nil)
+[375] = (nil)
+[376] = (nil)
+[377] = (nil)
+[378] = (nil)
+[379] = (nil)
+[380] = (nil)
+[381] = (nil)
+[382] = (nil)
+[383] = (nil)
+[384] = (nil)
+[385] = (nil)
+[386] = (nil)
+[387] = (nil)
+[388] = (nil)
+[389] = (nil)
+[390] = (nil)
+[391] = (nil)
+[392] = (nil)
+[393] = (nil)
+[394] = (nil)
+[395] = (nil)
+[396] = (nil)
+[397] = (nil)
+[398] = (nil)
+[399] = (nil)
+[400] = (nil)
+[401] = (nil)
+[402] = (nil)
+[403] = (nil)
+[404] = (nil)
+[405] = (nil)
+[406] = (nil)
+[407] = (nil)
+[408] = (nil)
+[409] = (nil)
+[410] = (nil)
+[411] = (nil)
+[412] = (nil)
+[413] = (nil)
+[414] = (nil)
+[415] = (nil)
+[416] = (nil)
+[417] = (nil)
+[418] = (nil)
+[419] = (nil)
+[420] = (nil)
+[421] = (nil)
+[422] = (nil)
+[423] = (nil)
+[424] = (nil)
+[425] = (nil)
+[426] = (nil)
+[427] = (nil)
+[428] = (nil)
+[429] = (nil)
+[430] = (nil)
+[431] = (nil)
+[432] = (nil)
+[433] = (nil)
+[434] = (nil)
+[435] = (nil)
+[436] = (nil)
+[437] = (nil)
+[438] = (nil)
+[439] = (nil)
+[440] = (nil)
+[441] = (nil)
+[442] = (nil)
+[443] = (nil)
+[444] = (nil)
+[445] = (nil)
+[446] = (nil)
+[447] = (nil)
+[448] = (nil)
+[449] = (nil)
+[450] = (nil)
+[451] = (nil)
+[452] = (nil)
+[453] = (nil)
+[454] = (nil)
+[455] = (nil)
+[456] = (nil)
+[457] = (nil)
+[458] = (nil)
+[459] = (nil)
+[460] = (nil)
+[461] = (nil)
+[462] = (nil)
+[463] = (nil)
+[464] = (nil)
+[465] = (nil)
+[466] = (nil)
+[467] = (nil)
+[468] = (nil)
+[469] = (nil)
+[470] = (nil)
+[471] = (nil)
+[472] = (nil)
+[473] = (nil)
+[474] = (nil)
+[475] = (nil)
+[476] = (nil)
+[477] = (nil)
+[478] = (nil)
+[479] = (nil)
+[480] = (nil)
+[481] = (nil)
+[482] = (nil)
+[483] = (nil)
+[484] = (nil)
+[485] = (nil)
+[486] = (nil)
+[487] = (nil)
+[488] = (nil)
+[489] = (nil)
+[490] = (nil)
+[491] = (nil)
+[492] = (nil)
+[493] = (nil)
+[494] = (nil)
+[495] = (nil)
+[496] = (nil)
+[497] = (nil)
+[498] = (nil)
+[499] = (nil)
+[500] = (nil)
+[501] = (nil)
+[502] = (nil)
+[503] = (nil)
+[504] = (nil)
+[505] = (nil)
+[506] = (nil)
+[507] = (nil)
+[508] = (nil)
+[509] = 0x45
+[510] = 0x46
+[511] = 0x46
+</gap>
diff --git a/testgap/run b/testgap/run
new file mode 100755
index 0000000..0810a39
--- /dev/null
+++ b/testgap/run
@@ -0,0 +1,30 @@
+#! /usr/bin/perl -w
+
+# This runs all the tests.
+
+# Tests scripts are in *.tst files.
+# Corresponding output is put in *.out.
+# Reference output is put in *.ref.
+# Any discrepancy will be reported!
+
+use strict;
+
+my @res;
+foreach my $fn (`ls *.tst`) {
+    chomp $fn;
+    my $cmd = "./gtest $fn $fn.out";
+    print "$cmd\n";
+    `$cmd`;
+    my $res = system("diff -u $fn.ref $fn.out");
+    push @res, [$fn, ($res == 0 ? "OK" : "*KO*")];
+}
+
+format =
+@<<<<<<<<<<<<<<<<<<<<<<<<<< @>>>
+$_->[0], $_->[1]
+.
+
+
+#format_name STDOUT test_result;
+map { write; } @res;
+