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Change sqlite3_snprintf() so that it does not write a zero-terminator if

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the buffer size argument is less than 1.  Ticket #2341.  Added documentation
about the sqlite3_snprintf() function. (CVS 3935)

FossilOrigin-Name: f3ae4ac5fe0bfa2f91e76a6def86c444e51fe80b
This commit is contained in:
drh
2007-05-07 11:24:30 +00:00
parent a9808b31a8
commit 6885390791
7 changed files with 83 additions and 19 deletions
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30
src/test1.c
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@@ -13,7 +13,7 @@
** is not included in the SQLite library. It is used for automated
** testing of the SQLite library.
**
** $Id: test1.c,v 1.248 2007/05/07 09:32:45 danielk1977 Exp $
** $Id: test1.c,v 1.249 2007/05/07 11:24:30 drh Exp $
*/
#include "sqliteInt.h"
#include "tcl.h"
@@ -426,6 +426,33 @@ static int test_mprintf_n(
return TCL_OK;
}
/*
** Usage: sqlite3_snprintf_int SIZE FORMAT INT
**
** Test the of sqlite3_snprintf() routine. SIZE is the size of the
** output buffer in bytes. The maximum size is 100. FORMAT is the
** format string. INT is a single integer argument. The FORMAT
** string must require no more than this one integer argument. If
** You pass in a format string that requires more than one argument,
** bad things will happen.
*/
static int test_snprintf_int(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
char **argv /* Text of each argument */
){
char zStr[100];
int n = atoi(argv[1]);
if( n>sizeof(zStr) ) n = sizeof(zStr);
const char *zFormat = argv[2];
int a1 = atoi(argv[3]);
strcpy(zStr, "abcdefghijklmnopqrstuvwxyz");
sqlite3_snprintf(n, zStr, zFormat, a1);
Tcl_AppendResult(interp, zStr, 0);
return TCL_OK;
}
/*
** Usage: sqlite3_get_table_printf DB FORMAT STRING
**
@@ -4609,6 +4636,7 @@ int Sqlitetest1_Init(Tcl_Interp *interp){
{ "sqlite3_mprintf_hexdouble", (Tcl_CmdProc*)sqlite3_mprintf_hexdouble},
{ "sqlite3_mprintf_z_test", (Tcl_CmdProc*)test_mprintf_z },
{ "sqlite3_mprintf_n_test", (Tcl_CmdProc*)test_mprintf_n },
{ "sqlite3_snprintf_int", (Tcl_CmdProc*)test_snprintf_int },
{ "sqlite3_last_insert_rowid", (Tcl_CmdProc*)test_last_rowid },
{ "sqlite3_exec_printf", (Tcl_CmdProc*)test_exec_printf },
{ "sqlite3_exec", (Tcl_CmdProc*)test_exec },