350 lines
8.6 KiB
C
350 lines
8.6 KiB
C
/*
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*
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* t c l - u t i l . c -- Some Tcl utilities (this correpond to part
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* of code of the Tcl lib modified to take into
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* account some Scheme specificities)
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*
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* Copyright © 1993-1999 Erick Gallesio - I3S-CNRS/ESSI <eg@unice.fr>
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*
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*
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* Permission to use, copy, modify, distribute,and license this
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* software and its documentation for any purpose is hereby granted,
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* provided that existing copyright notices are retained in all
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* copies and that this notice is included verbatim in any
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* distributions. No written agreement, license, or royalty fee is
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* required for any of the authorized uses.
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* This software is provided ``AS IS'' without express or implied
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* warranty.
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*
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*
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* Author: Erick Gallesio [eg@unice.fr]
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* Creation date: 26-Feb-1993 10:10
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* Last file update: 3-Sep-1999 20:59 (eg)
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*
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*
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* This code is derivated from several Tcl files which have the following
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* copyright notice
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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 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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#include "stk.h"
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#ifndef WIN32
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# include <tclInt.h>
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# include <tclPort.h>
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#endif
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/*
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*----------------------------------------------------------------------
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*
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* Tcl_PosixError --
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*
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* This procedure is typically called after UNIX kernel calls
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* return errors. It stores machine-readable information about
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* the error in $errorCode returns an information string for
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* the caller's use.
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*
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* Results:
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* The return value is a human-readable string describing the
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* error, as returned by strerror.
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*
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* Side effects:
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* The global variable $errorCode is reset.
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*
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*----------------------------------------------------------------------
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*/
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char *
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Tcl_PosixError(interp)
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Tcl_Interp *interp; /* Interpreter whose $errorCode variable
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* is to be changed. */
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{
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#ifdef STk_CODE
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return (char *) strerror(errno);
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#else
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char *id, *msg;
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id = Tcl_ErrnoId();
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msg = strerror(errno);
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Tcl_SetErrorCode(interp, "POSIX", id, msg, (char *) NULL);
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return msg;
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#endif
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}
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/*
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*----------------------------------------------------------------------
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*
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* Tcl_Backslash --
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*
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* Figure out how to handle a backslash sequence.
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*
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* Results:
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* The return value is the character that should be substituted
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* in place of the backslash sequence that starts at src. If
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* readPtr isn't NULL then it is filled in with a count of the
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* number of characters in the backslash sequence.
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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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char
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Tcl_Backslash(src, readPtr)
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CONST char *src; /* Points to the backslash character of
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* a backslash sequence. */
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int *readPtr; /* Fill in with number of characters read
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* from src, unless NULL. */
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{
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CONST char *p = src+1;
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char result;
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int count;
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count = 2;
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switch (*p) {
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case 'a':
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result = 0x7; /* Don't say '\a' here, since some compilers */
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break; /* don't support it. */
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case 'b':
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result = '\b';
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break;
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case 'f':
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result = '\f';
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break;
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case 'n':
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result = '\n';
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break;
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case 'r':
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result = '\r';
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break;
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case 't':
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result = '\t';
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break;
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case 'v':
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result = '\v';
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break;
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case 'x':
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if (isxdigit(UCHAR(p[1]))) {
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char *end;
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result = (char) strtoul(p+1, &end, 16);
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count = end - src;
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} else {
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count = 2;
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result = 'x';
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}
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break;
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case '\n':
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do {
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p++;
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} while (isspace(UCHAR(*p)));
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result = ' ';
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count = p - src;
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break;
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case 0:
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result = '\\';
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count = 1;
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break;
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default:
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if (isdigit(UCHAR(*p))) {
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result = *p - '0';
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p++;
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if (!isdigit(UCHAR(*p))) {
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break;
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}
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count = 3;
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result = (result << 3) + (*p - '0');
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p++;
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if (!isdigit(UCHAR(*p))) {
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break;
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}
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count = 4;
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result = (result << 3) + (*p - '0');
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break;
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}
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result = *p;
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count = 2;
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break;
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}
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if (readPtr != NULL) {
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*readPtr = count;
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}
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return result;
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}
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/*
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*----------------------------------------------------------------------
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*
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* Tcl_TildeSubst --
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*
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* Given a name starting with a tilde, produce a name where
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* the tilde and following characters have been replaced by
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* the home directory location for the named user.
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*
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* Results:
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* The result is a pointer to a static string containing
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* the new name. If there was an error in processing the
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* tilde, then an error message is left in interp->result
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* and the return value is NULL. The result may be stored
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* in bufferPtr; the caller must call Tcl_DStringFree(bufferPtr)
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* to free the name.
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*
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* Side effects:
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* Information may be left in bufferPtr.
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*
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*----------------------------------------------------------------------
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*/
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char *
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Tcl_TildeSubst(interp, name, bufferPtr)
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Tcl_Interp *interp; /* Interpreter in which to store error
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* message (if necessary). */
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char *name; /* File name, which may begin with "~/"
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* (to indicate current user's home directory)
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* or "~<user>/" (to indicate any user's
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* home directory). */
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Tcl_DString *bufferPtr; /* May be used to hold result. Must not hold
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* anything at the time of the call, and need
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* not even be initialized. */
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{
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char *dir;
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register char *p;
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Tcl_DStringInit(bufferPtr);
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if (name[0] != '~') {
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Tcl_DStringAppend(bufferPtr, name, -1);
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return name;
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}
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if ((name[1] == '/') || (name[1] == '\0')) {
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dir = getenv("HOME");
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if (dir == NULL) {
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Tcl_ResetResult(interp);
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Tcl_AppendResult(interp, "couldn't find HOME environment ",
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"variable to expand \"", name, "\"", (char *) NULL);
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return NULL;
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}
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Tcl_DStringAppend(bufferPtr, dir, -1);
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Tcl_DStringAppend(bufferPtr, name+1, -1);
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} else {
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struct passwd *pwPtr;
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for (p = &name[1]; (*p != 0) && (*p != '/'); p++) {
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/* Null body; just find end of name. */
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}
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Tcl_DStringAppend(bufferPtr, name+1, p - (name+1));
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#ifdef WIN32
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Tcl_ResetResult(interp);
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Tcl_AppendResult(interp, "user \"", bufferPtr->string,
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"\" doesn't exist", (char *) NULL);
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return NULL;
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}
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#else
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pwPtr = getpwnam(bufferPtr->string);
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if (pwPtr == NULL) {
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endpwent();
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Tcl_ResetResult(interp);
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Tcl_AppendResult(interp, "user \"", bufferPtr->string,
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"\" doesn't exist", (char *) NULL);
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return NULL;
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}
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Tcl_DStringFree(bufferPtr);
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Tcl_DStringAppend(bufferPtr, pwPtr->pw_dir, -1);
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Tcl_DStringAppend(bufferPtr, p, -1);
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endpwent();
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}
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return bufferPtr->string;
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#endif
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}
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int Tcl_ExprDouble(interp, string, ptr)
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Tcl_Interp *interp; /* Context in which to evaluate the
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* expression. */
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char *string; /* Expression to evaluate. */
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double *ptr; /* Where to store result. */
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{
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SCM value = STk_eval_C_string(string, NIL);
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if (value) {
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if (NUMBERP(value)) {
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*ptr = FLONM(STk_exact2inexact(value));
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return TCL_OK;
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}
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}
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interp->result = "expression didn't have numeric value";
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return TCL_ERROR;
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}
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int Tcl_ExprLong(interp, string, ptr)
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Tcl_Interp *interp; /* Context in which to evaluate the
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* expression. */
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char *string; /* Expression to evaluate. */
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long *ptr; /* Where to store result. */
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{
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SCM value = STk_eval_C_string(string, NIL);
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if (value) {
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if (EXACTP(value)) {
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*ptr = (long) FLONM(STk_exact2inexact(value));
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return TCL_OK;
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}
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}
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interp->result = "expression didn't have numeric value";
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return TCL_ERROR;
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}
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#ifdef USE_TK
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void Tcl_AddErrorInfo(interp, message)
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Tcl_Interp *interp;
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char *message;
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{
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SCM old = STk_lookup_variable(ERROR_INFO, STk_Tk_module);
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SCM new = STk_makestring(message);
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if (!STRINGP(old)) old = STk_makestring("");
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/* Append message to current value of *error-info* */
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STk_define_variable(ERROR_INFO,
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STk_string_append(LIST2(old, new), 2),
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STk_Tk_module);
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}
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#endif
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/*
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*----------------------------------------------------------------------
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*
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* Tcl_AllowExceptions --
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*
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* Sets a flag in an interpreter so that exceptions can occur
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* in the next call to Tcl_Eval without them being turned into
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* errors.
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*
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* Results:
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* None.
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*
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* Side effects:
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* The TCL_ALLOW_EXCEPTIONS flag gets set in the interpreter's
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* evalFlags structure. See the reference documentation for
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* more details.
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*
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*----------------------------------------------------------------------
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*/
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void
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Tcl_AllowExceptions(interp)
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Tcl_Interp *interp; /* Interpreter in which to set flag. */
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{
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Interp *iPtr = (Interp *) interp;
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iPtr->evalFlags |= TCL_ALLOW_EXCEPTIONS;
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}
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