tclGet.c
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上传日期:2015-12-11
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文件大小:9k
- /*
- * tclGet.c --
- *
- * This file contains procedures to convert strings into
- * other forms, like integers or floating-point numbers or
- * booleans, doing syntax checking along the way.
- *
- * Copyright (c) 1990-1993 The Regents of the University of California.
- * Copyright (c) 1994-1997 Sun Microsystems, Inc.
- *
- * See the file "license.terms" for information on usage and redistribution
- * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
- *
- * RCS: @(#) $Id: tclGet.c,v 1.8.2.1 2005/04/20 16:06:17 dgp Exp $
- */
- #include "tclInt.h"
- #include "tclPort.h"
- #include "tclMath.h"
- /*
- *----------------------------------------------------------------------
- *
- * Tcl_GetInt --
- *
- * Given a string, produce the corresponding integer value.
- *
- * Results:
- * The return value is normally TCL_OK; in this case *intPtr
- * will be set to the integer value equivalent to string. If
- * string is improperly formed then TCL_ERROR is returned and
- * an error message will be left in the interp's result.
- *
- * Side effects:
- * None.
- *
- *----------------------------------------------------------------------
- */
- int
- Tcl_GetInt(interp, string, intPtr)
- Tcl_Interp *interp; /* Interpreter to use for error reporting. */
- CONST char *string; /* String containing a (possibly signed)
- * integer in a form acceptable to strtol. */
- int *intPtr; /* Place to store converted result. */
- {
- char *end;
- CONST char *p = string;
- long i;
- /*
- * Note: use strtoul instead of strtol for integer conversions
- * to allow full-size unsigned numbers, but don't depend on strtoul
- * to handle sign characters; it won't in some implementations.
- */
- errno = 0;
- #ifdef TCL_STRTOUL_SIGN_CHECK
- /*
- * This special sign check actually causes bad numbers to be allowed
- * when strtoul. I can't find a strtoul that doesn't validly handle
- * signed characters, and the C standard implies that this is all
- * unnecessary. [Bug #634856]
- */
- for ( ; isspace(UCHAR(*p)); p++) { /* INTL: ISO space. */
- /* Empty loop body. */
- }
- if (*p == '-') {
- p++;
- i = -((long)strtoul(p, &end, 0)); /* INTL: Tcl source. */
- } else if (*p == '+') {
- p++;
- i = strtoul(p, &end, 0); /* INTL: Tcl source. */
- } else
- #else
- i = strtoul(p, &end, 0); /* INTL: Tcl source. */
- #endif
- if (end == p) {
- badInteger:
- if (interp != (Tcl_Interp *) NULL) {
- Tcl_AppendResult(interp, "expected integer but got "", string,
- """, (char *) NULL);
- TclCheckBadOctal(interp, string);
- }
- return TCL_ERROR;
- }
- /*
- * The second test below is needed on platforms where "long" is
- * larger than "int" to detect values that fit in a long but not in
- * an int.
- */
- if ((errno == ERANGE)
- #if (LONG_MAX > INT_MAX)
- || (i > UINT_MAX) || (i < -(long)UINT_MAX)
- #endif
- ) {
- if (interp != (Tcl_Interp *) NULL) {
- Tcl_SetResult(interp, "integer value too large to represent",
- TCL_STATIC);
- Tcl_SetErrorCode(interp, "ARITH", "IOVERFLOW",
- Tcl_GetStringResult(interp), (char *) NULL);
- }
- return TCL_ERROR;
- }
- while ((*end != ' ') && isspace(UCHAR(*end))) { /* INTL: ISO space. */
- end++;
- }
- if (*end != 0) {
- goto badInteger;
- }
- *intPtr = (int) i;
- return TCL_OK;
- }
- /*
- *----------------------------------------------------------------------
- *
- * TclGetLong --
- *
- * Given a string, produce the corresponding long integer value.
- * This routine is a version of Tcl_GetInt but returns a "long"
- * instead of an "int".
- *
- * Results:
- * The return value is normally TCL_OK; in this case *longPtr
- * will be set to the long integer value equivalent to string. If
- * string is improperly formed then TCL_ERROR is returned and
- * an error message will be left in the interp's result if interp
- * is non-NULL.
- *
- * Side effects:
- * None.
- *
- *----------------------------------------------------------------------
- */
- int
- TclGetLong(interp, string, longPtr)
- Tcl_Interp *interp; /* Interpreter used for error reporting
- * if not NULL. */
- CONST char *string; /* String containing a (possibly signed)
- * long integer in a form acceptable to
- * strtoul. */
- long *longPtr; /* Place to store converted long result. */
- {
- char *end;
- CONST char *p = string;
- long i;
- /*
- * Note: don't depend on strtoul to handle sign characters; it won't
- * in some implementations.
- */
- errno = 0;
- #ifdef TCL_STRTOUL_SIGN_CHECK
- for ( ; isspace(UCHAR(*p)); p++) { /* INTL: ISO space. */
- /* Empty loop body. */
- }
- if (*p == '-') {
- p++;
- i = -(int)strtoul(p, &end, 0); /* INTL: Tcl source. */
- } else if (*p == '+') {
- p++;
- i = strtoul(p, &end, 0); /* INTL: Tcl source. */
- } else
- #else
- i = strtoul(p, &end, 0); /* INTL: Tcl source. */
- #endif
- if (end == p) {
- badInteger:
- if (interp != (Tcl_Interp *) NULL) {
- Tcl_AppendResult(interp, "expected integer but got "", string,
- """, (char *) NULL);
- TclCheckBadOctal(interp, string);
- }
- return TCL_ERROR;
- }
- if (errno == ERANGE) {
- if (interp != (Tcl_Interp *) NULL) {
- Tcl_SetResult(interp, "integer value too large to represent",
- TCL_STATIC);
- Tcl_SetErrorCode(interp, "ARITH", "IOVERFLOW",
- Tcl_GetStringResult(interp), (char *) NULL);
- }
- return TCL_ERROR;
- }
- while ((*end != ' ') && isspace(UCHAR(*end))) { /* INTL: ISO space. */
- end++;
- }
- if (*end != 0) {
- goto badInteger;
- }
- *longPtr = i;
- return TCL_OK;
- }
- /*
- *----------------------------------------------------------------------
- *
- * Tcl_GetDouble --
- *
- * Given a string, produce the corresponding double-precision
- * floating-point value.
- *
- * Results:
- * The return value is normally TCL_OK; in this case *doublePtr
- * will be set to the double-precision value equivalent to string.
- * If string is improperly formed then TCL_ERROR is returned and
- * an error message will be left in the interp's result.
- *
- * Side effects:
- * None.
- *
- *----------------------------------------------------------------------
- */
- int
- Tcl_GetDouble(interp, string, doublePtr)
- Tcl_Interp *interp; /* Interpreter used for error reporting. */
- CONST char *string; /* String containing a floating-point number
- * in a form acceptable to strtod. */
- double *doublePtr; /* Place to store converted result. */
- {
- char *end;
- double d;
- errno = 0;
- d = strtod(string, &end); /* INTL: Tcl source. */
- if (end == string) {
- badDouble:
- if (interp != (Tcl_Interp *) NULL) {
- Tcl_AppendResult(interp,
- "expected floating-point number but got "",
- string, """, (char *) NULL);
- }
- return TCL_ERROR;
- }
- if (errno != 0 && (d == HUGE_VAL || d == -HUGE_VAL || d == 0)) {
- if (interp != (Tcl_Interp *) NULL) {
- TclExprFloatError(interp, d);
- }
- return TCL_ERROR;
- }
- while ((*end != 0) && isspace(UCHAR(*end))) { /* INTL: ISO space. */
- end++;
- }
- if (*end != 0) {
- goto badDouble;
- }
- *doublePtr = d;
- return TCL_OK;
- }
- /*
- *----------------------------------------------------------------------
- *
- * Tcl_GetBoolean --
- *
- * Given a string, return a 0/1 boolean value corresponding
- * to the string.
- *
- * Results:
- * The return value is normally TCL_OK; in this case *boolPtr
- * will be set to the 0/1 value equivalent to string. If
- * string is improperly formed then TCL_ERROR is returned and
- * an error message will be left in the interp's result.
- *
- * Side effects:
- * None.
- *
- *----------------------------------------------------------------------
- */
- int
- Tcl_GetBoolean(interp, string, boolPtr)
- Tcl_Interp *interp; /* Interpreter used for error reporting. */
- CONST char *string; /* String containing a boolean number
- * specified either as 1/0 or true/false or
- * yes/no. */
- int *boolPtr; /* Place to store converted result, which
- * will be 0 or 1. */
- {
- int i;
- char lowerCase[10], c;
- size_t length;
- /*
- * Convert the input string to all lower-case.
- * INTL: This code will work on UTF strings.
- */
- for (i = 0; i < 9; i++) {
- c = string[i];
- if (c == 0) {
- break;
- }
- if ((c >= 'A') && (c <= 'Z')) {
- c += (char) ('a' - 'A');
- }
- lowerCase[i] = c;
- }
- lowerCase[i] = 0;
- length = strlen(lowerCase);
- c = lowerCase[0];
- if ((c == '0') && (lowerCase[1] == ' ')) {
- *boolPtr = 0;
- } else if ((c == '1') && (lowerCase[1] == ' ')) {
- *boolPtr = 1;
- } else if ((c == 'y') && (strncmp(lowerCase, "yes", length) == 0)) {
- *boolPtr = 1;
- } else if ((c == 'n') && (strncmp(lowerCase, "no", length) == 0)) {
- *boolPtr = 0;
- } else if ((c == 't') && (strncmp(lowerCase, "true", length) == 0)) {
- *boolPtr = 1;
- } else if ((c == 'f') && (strncmp(lowerCase, "false", length) == 0)) {
- *boolPtr = 0;
- } else if ((c == 'o') && (length >= 2)) {
- if (strncmp(lowerCase, "on", length) == 0) {
- *boolPtr = 1;
- } else if (strncmp(lowerCase, "off", length) == 0) {
- *boolPtr = 0;
- } else {
- goto badBoolean;
- }
- } else {
- badBoolean:
- if (interp != (Tcl_Interp *) NULL) {
- Tcl_AppendResult(interp, "expected boolean value but got "",
- string, """, (char *) NULL);
- }
- return TCL_ERROR;
- }
- return TCL_OK;
- }