329 lines
8.6 KiB
C
329 lines
8.6 KiB
C
/*
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* tclGet.c --
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*
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* This file contains procedures to convert strings into
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* other forms, like integers or floating-point numbers or
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* booleans, doing syntax checking along the way.
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*
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* Copyright (c) 1990-1993 The Regents of the University of California.
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* Copyright (c) 1994-1995 Sun Microsystems, Inc.
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*
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* See the file "license.terms" for information on usage and redistribution
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*
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* SCCS: @(#) tclGet.c 1.33 97/05/14 16:42:19
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*/
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#include "tclInt.h"
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#include "tclPort.h"
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/*
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*----------------------------------------------------------------------
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*
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* Tcl_GetInt --
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*
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* Given a string, produce the corresponding integer value.
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*
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* Results:
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* The return value is normally TCL_OK; in this case *intPtr
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* will be set to the integer value equivalent to string. If
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* string is improperly formed then TCL_ERROR is returned and
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* an error message will be left in interp->result.
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*
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* Side effects:
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* None.
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*
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*----------------------------------------------------------------------
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*/
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int
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Tcl_GetInt(interp, string, intPtr)
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Tcl_Interp *interp; /* Interpreter to use for error reporting. */
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char *string; /* String containing a (possibly signed)
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* integer in a form acceptable to strtol. */
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int *intPtr; /* Place to store converted result. */
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{
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char *end, *p;
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long i;
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/*
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* Note: use strtoul instead of strtol for integer conversions
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* to allow full-size unsigned numbers, but don't depend on strtoul
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* to handle sign characters; it won't in some implementations.
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*/
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errno = 0;
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for (p = string; isspace(UCHAR(*p)); p++) {
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/* Empty loop body. */
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}
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if (*p == '-') {
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p++;
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i = -((long)strtoul(p, &end, 0));
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} else if (*p == '+') {
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p++;
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i = strtoul(p, &end, 0);
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} else {
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i = strtoul(p, &end, 0);
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}
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if (end == p) {
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badInteger:
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if (interp != (Tcl_Interp *) NULL) {
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Tcl_AppendResult(interp, "expected integer but got \"", string,
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"\"", (char *) NULL);
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}
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return TCL_ERROR;
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}
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/*
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* The second test below is needed on platforms where "long" is
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* larger than "int" to detect values that fit in a long but not in
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* an int.
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*/
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if ((errno == ERANGE) || (((long)(int) i) != i)) {
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if (interp != (Tcl_Interp *) NULL) {
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Tcl_SetResult(interp, "integer value too large to represent",
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TCL_STATIC);
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Tcl_SetErrorCode(interp, "ARITH", "IOVERFLOW",
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interp->result, (char *) NULL);
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}
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return TCL_ERROR;
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}
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while ((*end != '\0') && isspace(UCHAR(*end))) {
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end++;
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}
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if (*end != 0) {
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goto badInteger;
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}
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*intPtr = (int) i;
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return TCL_OK;
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}
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/*
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*----------------------------------------------------------------------
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*
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* TclGetLong --
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*
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* Given a string, produce the corresponding long integer value.
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* This routine is a version of Tcl_GetInt but returns a "long"
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* instead of an "int".
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*
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* Results:
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* The return value is normally TCL_OK; in this case *longPtr
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* will be set to the long integer value equivalent to string. If
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* string is improperly formed then TCL_ERROR is returned and
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* an error message will be left in interp->result.
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*
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* Side effects:
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* None.
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*
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*----------------------------------------------------------------------
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*/
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int
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TclGetLong(interp, string, longPtr)
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Tcl_Interp *interp; /* Interpreter used for error reporting. */
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char *string; /* String containing a (possibly signed)
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* long integer in a form acceptable to
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* strtoul. */
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long *longPtr; /* Place to store converted long result. */
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{
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char *end, *p;
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long i;
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/*
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* Note: don't depend on strtoul to handle sign characters; it won't
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* in some implementations.
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*/
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errno = 0;
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for (p = string; isspace(UCHAR(*p)); p++) {
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/* Empty loop body. */
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}
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if (*p == '-') {
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p++;
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i = -(int)strtoul(p, &end, 0);
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} else if (*p == '+') {
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p++;
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i = strtoul(p, &end, 0);
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} else {
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i = strtoul(p, &end, 0);
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}
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if (end == p) {
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badInteger:
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if (interp != (Tcl_Interp *) NULL) {
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Tcl_AppendResult(interp, "expected integer but got \"", string,
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"\"", (char *) NULL);
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}
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return TCL_ERROR;
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}
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if (errno == ERANGE) {
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if (interp != (Tcl_Interp *) NULL) {
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Tcl_SetResult(interp, "integer value too large to represent",
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TCL_STATIC);
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Tcl_SetErrorCode(interp, "ARITH", "IOVERFLOW",
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interp->result, (char *) NULL);
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}
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return TCL_ERROR;
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}
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while ((*end != '\0') && isspace(UCHAR(*end))) {
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end++;
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}
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if (*end != 0) {
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goto badInteger;
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}
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*longPtr = i;
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return TCL_OK;
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}
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/*
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*----------------------------------------------------------------------
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*
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* Tcl_GetDouble --
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*
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* Given a string, produce the corresponding double-precision
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* floating-point value.
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*
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* Results:
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* The return value is normally TCL_OK; in this case *doublePtr
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* will be set to the double-precision value equivalent to string.
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* If string is improperly formed then TCL_ERROR is returned and
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* an error message will be left in interp->result.
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*
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* Side effects:
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* None.
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*
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*----------------------------------------------------------------------
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*/
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int
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Tcl_GetDouble(interp, string, doublePtr)
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Tcl_Interp *interp; /* Interpreter used for error reporting. */
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char *string; /* String containing a floating-point number
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* in a form acceptable to strtod. */
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double *doublePtr; /* Place to store converted result. */
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{
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char *end;
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double d;
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errno = 0;
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d = strtod(string, &end);
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if (end == string) {
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badDouble:
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if (interp != (Tcl_Interp *) NULL) {
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Tcl_AppendResult(interp,
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"expected floating-point number but got \"",
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string, "\"", (char *) NULL);
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}
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return TCL_ERROR;
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}
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if (errno != 0) {
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if (interp != (Tcl_Interp *) NULL) {
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TclExprFloatError(interp, d); /* sets interp->objResult */
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/*
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* Move the interpreter's object result to the string result,
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* then reset the object result.
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* FAILS IF OBJECT RESULT'S STRING REPRESENTATION HAS NULLS.
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*/
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Tcl_SetResult(interp,
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TclGetStringFromObj(Tcl_GetObjResult(interp),
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(int *) NULL),
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TCL_VOLATILE);
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}
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return TCL_ERROR;
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}
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while ((*end != 0) && isspace(UCHAR(*end))) {
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end++;
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}
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if (*end != 0) {
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goto badDouble;
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}
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*doublePtr = d;
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return TCL_OK;
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}
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/*
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*----------------------------------------------------------------------
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*
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* Tcl_GetBoolean --
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*
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* Given a string, return a 0/1 boolean value corresponding
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* to the string.
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*
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* Results:
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* The return value is normally TCL_OK; in this case *boolPtr
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* will be set to the 0/1 value equivalent to string. If
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* string is improperly formed then TCL_ERROR is returned and
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* an error message will be left in interp->result.
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*
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* Side effects:
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* None.
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*
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*----------------------------------------------------------------------
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*/
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int
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Tcl_GetBoolean(interp, string, boolPtr)
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Tcl_Interp *interp; /* Interpreter used for error reporting. */
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char *string; /* String containing a boolean number
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* specified either as 1/0 or true/false or
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* yes/no. */
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int *boolPtr; /* Place to store converted result, which
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* will be 0 or 1. */
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{
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int i;
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char lowerCase[10], c;
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size_t length;
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/*
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* Convert the input string to all lower-case.
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*/
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for (i = 0; i < 9; i++) {
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c = string[i];
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if (c == 0) {
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break;
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}
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if ((c >= 'A') && (c <= 'Z')) {
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c += (char) ('a' - 'A');
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}
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lowerCase[i] = c;
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}
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lowerCase[i] = 0;
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length = strlen(lowerCase);
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c = lowerCase[0];
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if ((c == '0') && (lowerCase[1] == '\0')) {
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*boolPtr = 0;
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} else if ((c == '1') && (lowerCase[1] == '\0')) {
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*boolPtr = 1;
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} else if ((c == 'y') && (strncmp(lowerCase, "yes", length) == 0)) {
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*boolPtr = 1;
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} else if ((c == 'n') && (strncmp(lowerCase, "no", length) == 0)) {
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*boolPtr = 0;
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} else if ((c == 't') && (strncmp(lowerCase, "true", length) == 0)) {
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*boolPtr = 1;
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} else if ((c == 'f') && (strncmp(lowerCase, "false", length) == 0)) {
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*boolPtr = 0;
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} else if ((c == 'o') && (length >= 2)) {
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if (strncmp(lowerCase, "on", length) == 0) {
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*boolPtr = 1;
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} else if (strncmp(lowerCase, "off", length) == 0) {
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*boolPtr = 0;
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} else {
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goto badBoolean;
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}
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} else {
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badBoolean:
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if (interp != (Tcl_Interp *) NULL) {
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Tcl_AppendResult(interp, "expected boolean value but got \"",
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string, "\"", (char *) NULL);
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}
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return TCL_ERROR;
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}
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return TCL_OK;
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}
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