Add the "max-limits" utility program to the tools/ subdirectory.

FossilOrigin-Name: c54173b6c1acbb41ed9c323099e94b8e02c6c895

1 files changed, 41 insertions, 0 deletions

diff --git a/tool/max-limits.c b/tool/max-limits.c
new file mode 100644
index 000000000..d01997442
--- /dev/null
+++ b/tool/max-limits.c
@@ -0,0 +1,41 @@
+/*
+** Link this program against an SQLite library of unknown provenance in order
+** to display the compile-time maximum values for various settings.
+*/
+#include "sqlite3.h"
+#include <stdio.h>
+
+static const struct {
+  int eCode;
+  char *zName;
+} aLimit[] = {
+  { SQLITE_LIMIT_LENGTH,                "SQLITE_MAX_LENGTH"               },
+  { SQLITE_LIMIT_SQL_LENGTH,            "SQLITE_MAX_SQL_LENGTH"           },
+  { SQLITE_LIMIT_COLUMN,                "SQLITE_MAX_COLUMN"               },
+  { SQLITE_LIMIT_EXPR_DEPTH,            "SQLITE_MAX_EXPR_DEPTH"           },
+  { SQLITE_LIMIT_COMPOUND_SELECT,       "SQLITE_MAX_COMPOUND_SELECT"      },
+  { SQLITE_LIMIT_VDBE_OP,               "SQLITE_MAX_VDBE_OP"              },
+  { SQLITE_LIMIT_FUNCTION_ARG,          "SQLITE_MAX_FUNCTION_ARG"         },
+  { SQLITE_LIMIT_ATTACHED,              "SQLITE_MAX_ATTACHED"             },
+  { SQLITE_LIMIT_LIKE_PATTERN_LENGTH,   "SQLITE_MAX_LIKE_PATTERN_LENGTH"  },
+  { SQLITE_LIMIT_VARIABLE_NUMBER,       "SQLITE_MAX_VARIABLE_NUMBER"      },
+  { SQLITE_LIMIT_TRIGGER_DEPTH,         "SQLITE_MAX_TRIGGER_DEPTH"        },
+  { SQLITE_LIMIT_WORKER_THREADS,        "SQLITE_MAX_WORKER_THREADS"       },
+};
+
+static int maxLimit(sqlite3 *db, int eCode){
+  int iOrig = sqlite3_limit(db, eCode, 0x7fffffff);
+  return sqlite3_limit(db, eCode, iOrig);
+}
+
+int main(int argc, char **argv){
+  sqlite3 *db;
+  int j, rc;
+  rc = sqlite3_open(":memory:", &db);
+  if( rc==SQLITE_OK ){
+    for(j=0; j<sizeof(aLimit)/sizeof(aLimit[0]); j++){
+      printf("%-35s %10d\n", aLimit[j].zName, maxLimit(db, aLimit[j].eCode));
+    }
+    sqlite3_close(db);
+  } 
+}