diff options
Diffstat (limited to 'generic/tclCmdIL.c')
| -rw-r--r-- | generic/tclCmdIL.c | 29 |
1 files changed, 18 insertions, 11 deletions
diff --git a/generic/tclCmdIL.c b/generic/tclCmdIL.c index 9cea6a7..2e8a032 100644 --- a/generic/tclCmdIL.c +++ b/generic/tclCmdIL.c @@ -14,7 +14,7 @@ * See the file "license.terms" for information on usage and redistribution * of this file, and for a DISCLAIMER OF ALL WARRANTIES. * - * RCS: @(#) $Id: tclCmdIL.c,v 1.33 2001/07/31 19:12:06 vincentdarley Exp $ + * RCS: @(#) $Id: tclCmdIL.c,v 1.34 2001/09/28 15:32:17 dkf Exp $ */ #include "tclInt.h" @@ -73,6 +73,13 @@ typedef struct SortInfo { #define SORTMODE_DICTIONARY 4 /* + * Magic values for the index field of the SortInfo structure. + * Note that the index "end-1" will be translated to SORTIDX_END-1, etc. + */ +#define SORTIDX_NONE -1 /* Not indexed; use whole value. */ +#define SORTIDX_END -2 /* Indexed from end. */ + +/* * Forward declarations for procedures defined in this file: */ @@ -2768,7 +2775,7 @@ Tcl_LsortObjCmd(clientData, interp, objc, objv) sortInfo.isIncreasing = 1; sortInfo.sortMode = SORTMODE_ASCII; - sortInfo.index = -1; + sortInfo.index = SORTIDX_NONE; sortInfo.interp = interp; sortInfo.resultCode = TCL_OK; cmdPtr = NULL; @@ -2809,8 +2816,8 @@ Tcl_LsortObjCmd(clientData, interp, objc, objv) -1); return TCL_ERROR; } - if (TclGetIntForIndex(interp, objv[i+1], -2, &sortInfo.index) - != TCL_OK) { + if (TclGetIntForIndex(interp, objv[i+1], SORTIDX_END, + &sortInfo.index) != TCL_OK) { return TCL_ERROR; } i++; @@ -3063,20 +3070,20 @@ SortCompare(objPtr1, objPtr2, infoPtr) return order; } - if (infoPtr->index != -1) { + if (infoPtr->index != SORTIDX_NONE) { /* * The "-index" option was specified. Treat each object as a * list, extract the requested element from each list, and - * compare the elements, not the lists. The special index "end" - * is signaled here with a large negative index. + * compare the elements, not the lists. "end"-relative indices + * are signaled here with large negative values. */ if (Tcl_ListObjLength(infoPtr->interp, objPtr1, &listLen) != TCL_OK) { infoPtr->resultCode = TCL_ERROR; return order; } - if (infoPtr->index < -1) { - index = listLen - 1; + if (infoPtr->index < SORTIDX_NONE) { + index = listLen + infoPtr->index + 1; } else { index = infoPtr->index; } @@ -3102,8 +3109,8 @@ SortCompare(objPtr1, objPtr2, infoPtr) infoPtr->resultCode = TCL_ERROR; return order; } - if (infoPtr->index < -1) { - index = listLen - 1; + if (infoPtr->index < SORTIDX_NONE) { + index = listLen + infoPtr->index + 1; } else { index = infoPtr->index; } |