Add the ".limit" command to the command-line shell.

FossilOrigin-Name: 803cb60e75e0b09a526eefec11139cb3e8ae8c7c

manifest

@@ -1,5 +1,5 @@
-C Reorganize\ssome\smulti-threaded\scode\sin\svdbesort.c\sso\sthat\sfull\sMC/DC\stest\scoverage\sdoes\snot\sdepend\son\sthe\soutcome\sof\sa\srace\scondition.
-D 2015-05-02T12:40:12.793
+C Add\sthe\s".limit"\scommand\sto\sthe\scommand-line\sshell.
+D 2015-05-02T17:40:23.555
 F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 F Makefile.in e628c50e237251fc7e768bef14ee7e822ad69e69
 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -231,7 +231,7 @@ F src/random.c ba2679f80ec82c4190062d756f22d0c358180696
 F src/resolve.c 13109bc3b5ab404446296efa17039640de5bc35d
 F src/rowset.c eccf6af6d620aaa4579bd3b72c1b6395d9e9fa1e
 F src/select.c 5e83049a0be1caf88921e815d0118bce49cba827
-F src/shell.c 0b68e745dff6fc7b9f86c330d401fd572a5bbbc2
+F src/shell.c b1e17be8565b5ce4138707d2808df077bf9750d9
 F src/sqlite.h.in ca27603a36fcacdaac5a19d8ee35aaff8ce8516f
 F src/sqlite3.rc 992c9f5fb8285ae285d6be28240a7e8d3a7f2bad
 F src/sqlite3ext.h 17d487c3c91b0b8c584a32fbeb393f6f795eea7d
@@ -1256,7 +1256,7 @@ F tool/vdbe_profile.tcl 67746953071a9f8f2f668b73fe899074e2c6d8c1
 F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
 F tool/warnings.sh 0abfd78ceb09b7f7c27c688c8e3fe93268a13b32
 F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
-P 7952c32268aa650d9ee946d5bfe190f712e3bbe6
-R b89595a534f421de5f0d98acb44972ee
-U dan
-Z 22691f754ec0b999bb5069d3c75c8ca1
+P 78c7ec95931265b89a92f6a799fc9b1a9f0476bf
+R b4e016ae5f2b9a1c3d3b22b5f2592000
+U drh
+Z d46a3572f454bea0b6b400466ab43088

manifest.uuid

@@ -1 +1 @@
-78c7ec95931265b89a92f6a799fc9b1a9f0476bf
+803cb60e75e0b09a526eefec11139cb3e8ae8c7c

src/shell.c

@@ -1793,6 +1793,7 @@ static char zHelp[] =
 #ifdef SQLITE_ENABLE_IOTRACE
   ".iotrace FILE          Enable I/O diagnostic logging to FILE\n"
 #endif
+  ".limit ?LIMIT? ?VAL?   Display or change the value of an SQLITE_LIMIT\n"
 #ifndef SQLITE_OMIT_LOAD_EXTENSION
   ".load FILE ?ENTRY?     Load an extension library\n"
 #endif
@@ -3171,6 +3172,63 @@ static int do_meta_command(char *zLine, ShellState *p){
     }
   }else
 #endif
+  if( c=='l' && n>=5 && strncmp(azArg[0], "limits", n)==0 ){
+    static const struct {
+       const char *zLimitName;   /* Name of a limit */
+       int limitCode;            /* Integer code for that limit */
+    } aLimit[] = {
+      { "length",                SQLITE_LIMIT_LENGTH                    },
+      { "sql_length",            SQLITE_LIMIT_SQL_LENGTH                },
+      { "column",                SQLITE_LIMIT_COLUMN                    },
+      { "expr_depth",            SQLITE_LIMIT_EXPR_DEPTH                },
+      { "compound_select",       SQLITE_LIMIT_COMPOUND_SELECT           },
+      { "vdbe_op",               SQLITE_LIMIT_VDBE_OP                   },
+      { "function_arg",          SQLITE_LIMIT_FUNCTION_ARG              },
+      { "attached",              SQLITE_LIMIT_ATTACHED                  },
+      { "like_pattern_length",   SQLITE_LIMIT_LIKE_PATTERN_LENGTH       },
+      { "variable_number",       SQLITE_LIMIT_VARIABLE_NUMBER           },
+      { "trigger_depth",         SQLITE_LIMIT_TRIGGER_DEPTH             },
+      { "worker_threads",        SQLITE_LIMIT_WORKER_THREADS            },
+    };
+    int i, n2;
+    open_db(p, 0);
+    if( nArg==1 ){
+      for(i=0; i<sizeof(aLimit)/sizeof(aLimit[0]); i++){
+        printf("%20s %d\n", aLimit[i].zLimitName, 
+               sqlite3_limit(p->db, aLimit[i].limitCode, -1));
+      }
+    }else if( nArg>3 ){
+      fprintf(stderr, "Usage: .limit NAME ?NEW-VALUE?\n");
+      rc = 1;
+      goto meta_command_exit;
+    }else{
+      int iLimit = -1;
+      n2 = strlen30(azArg[1]);
+      for(i=0; i<sizeof(aLimit)/sizeof(aLimit[0]); i++){
+        if( sqlite3_strnicmp(aLimit[i].zLimitName, azArg[1], n2)==0 ){
+          if( iLimit<0 ){
+            iLimit = i;
+          }else{
+            fprintf(stderr, "ambiguous limit: \"%s\"\n", azArg[1]);
+            rc = 1;
+            goto meta_command_exit;
+          }
+        }
+      }
+      if( iLimit<0 ){
+        fprintf(stderr, "unknown limit: \"%s\"\n"
+                        "enter \".limits\" with no arguments for a list.\n",
+                         azArg[1]);
+        rc = 1;
+        goto meta_command_exit;
+      }
+      if( nArg==3 ){
+        sqlite3_limit(p->db, aLimit[iLimit].limitCode, integerValue(azArg[2]));
+      }
+      printf("%20s %d\n", aLimit[iLimit].zLimitName,
+             sqlite3_limit(p->db, aLimit[iLimit].limitCode, -1));
+    }
+  }else
 
 #ifndef SQLITE_OMIT_LOAD_EXTENSION
   if( c=='l' && strncmp(azArg[0], "load", n)==0 ){