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freebsd-skq/contrib/tcl/generic/tclUtil.c
phk 4170733a21 Import tcl7.5p1
1996-09-18 14:12:34 +00:00

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/*
* tclUtil.c --
*
* This file contains utility procedures that are used by many Tcl
* commands.
*
* Copyright (c) 1987-1993 The Regents of the University of California.
* Copyright (c) 1994-1995 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* SCCS: @(#) tclUtil.c 1.114 96/06/06 13:48:58
*/
#include "tclInt.h"
#include "tclPort.h"
/*
* The following values are used in the flags returned by Tcl_ScanElement
* and used by Tcl_ConvertElement. The value TCL_DONT_USE_BRACES is also
* defined in tcl.h; make sure its value doesn't overlap with any of the
* values below.
*
* TCL_DONT_USE_BRACES - 1 means the string mustn't be enclosed in
* braces (e.g. it contains unmatched braces,
* or ends in a backslash character, or user
* just doesn't want braces); handle all
* special characters by adding backslashes.
* USE_BRACES - 1 means the string contains a special
* character that can be handled simply by
* enclosing the entire argument in braces.
* BRACES_UNMATCHED - 1 means that braces aren't properly matched
* in the argument.
*/
#define USE_BRACES 2
#define BRACES_UNMATCHED 4
/*
* Function prototypes for local procedures in this file:
*/
static void SetupAppendBuffer _ANSI_ARGS_((Interp *iPtr,
int newSpace));
/*
*----------------------------------------------------------------------
*
* TclFindElement --
*
* Given a pointer into a Tcl list, locate the first (or next)
* element in the list.
*
* Results:
* The return value is normally TCL_OK, which means that the
* element was successfully located. If TCL_ERROR is returned
* it means that list didn't have proper list structure;
* interp->result contains a more detailed error message.
*
* If TCL_OK is returned, then *elementPtr will be set to point
* to the first element of list, and *nextPtr will be set to point
* to the character just after any white space following the last
* character that's part of the element. If this is the last argument
* in the list, then *nextPtr will point to the NULL character at the
* end of list. If sizePtr is non-NULL, *sizePtr is filled in with
* the number of characters in the element. If the element is in
* braces, then *elementPtr will point to the character after the
* opening brace and *sizePtr will not include either of the braces.
* If there isn't an element in the list, *sizePtr will be zero, and
* both *elementPtr and *termPtr will refer to the null character at
* the end of list. Note: this procedure does NOT collapse backslash
* sequences.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
TclFindElement(interp, list, elementPtr, nextPtr, sizePtr, bracePtr)
Tcl_Interp *interp; /* Interpreter to use for error reporting.
* If NULL, then no error message is left
* after errors. */
register char *list; /* String containing Tcl list with zero
* or more elements (possibly in braces). */
char **elementPtr; /* Fill in with location of first significant
* character in first element of list. */
char **nextPtr; /* Fill in with location of character just
* after all white space following end of
* argument (i.e. next argument or end of
* list). */
int *sizePtr; /* If non-zero, fill in with size of
* element. */
int *bracePtr; /* If non-zero fill in with non-zero/zero
* to indicate that arg was/wasn't
* in braces. */
{
register char *p;
int openBraces = 0;
int inQuotes = 0;
int size;
/*
* Skim off leading white space and check for an opening brace or
* quote. Note: use of "isascii" below and elsewhere in this
* procedure is a temporary hack (7/27/90) because Mx uses characters
* with the high-order bit set for some things. This should probably
* be changed back eventually, or all of Tcl should call isascii.
*/
while (isspace(UCHAR(*list))) {
list++;
}
if (*list == '{') {
openBraces = 1;
list++;
} else if (*list == '"') {
inQuotes = 1;
list++;
}
if (bracePtr != 0) {
*bracePtr = openBraces;
}
p = list;
/*
* Find the end of the element (either a space or a close brace or
* the end of the string).
*/
while (1) {
switch (*p) {
/*
* Open brace: don't treat specially unless the element is
* in braces. In this case, keep a nesting count.
*/
case '{':
if (openBraces != 0) {
openBraces++;
}
break;
/*
* Close brace: if element is in braces, keep nesting
* count and quit when the last close brace is seen.
*/
case '}':
if (openBraces == 1) {
char *p2;
size = p - list;
p++;
if (isspace(UCHAR(*p)) || (*p == 0)) {
goto done;
}
for (p2 = p; (*p2 != 0) && (!isspace(UCHAR(*p2)))
&& (p2 < p+20); p2++) {
/* null body */
}
if (interp != NULL) {
Tcl_ResetResult(interp);
sprintf(interp->result,
"list element in braces followed by \"%.*s\" instead of space",
(int) (p2-p), p);
}
return TCL_ERROR;
} else if (openBraces != 0) {
openBraces--;
}
break;
/*
* Backslash: skip over everything up to the end of the
* backslash sequence.
*/
case '\\': {
int size;
(void) Tcl_Backslash(p, &size);
p += size - 1;
break;
}
/*
* Space: ignore if element is in braces or quotes; otherwise
* terminate element.
*/
case ' ':
case '\f':
case '\n':
case '\r':
case '\t':
case '\v':
if ((openBraces == 0) && !inQuotes) {
size = p - list;
goto done;
}
break;
/*
* Double-quote: if element is in quotes then terminate it.
*/
case '"':
if (inQuotes) {
char *p2;
size = p-list;
p++;
if (isspace(UCHAR(*p)) || (*p == 0)) {
goto done;
}
for (p2 = p; (*p2 != 0) && (!isspace(UCHAR(*p2)))
&& (p2 < p+20); p2++) {
/* null body */
}
if (interp != NULL) {
Tcl_ResetResult(interp);
sprintf(interp->result,
"list element in quotes followed by \"%.*s\" %s", (int) (p2-p), p,
"instead of space");
}
return TCL_ERROR;
}
break;
/*
* End of list: terminate element.
*/
case 0:
if (openBraces != 0) {
if (interp != NULL) {
Tcl_SetResult(interp, "unmatched open brace in list",
TCL_STATIC);
}
return TCL_ERROR;
} else if (inQuotes) {
if (interp != NULL) {
Tcl_SetResult(interp, "unmatched open quote in list",
TCL_STATIC);
}
return TCL_ERROR;
}
size = p - list;
goto done;
}
p++;
}
done:
while (isspace(UCHAR(*p))) {
p++;
}
*elementPtr = list;
*nextPtr = p;
if (sizePtr != 0) {
*sizePtr = size;
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* TclCopyAndCollapse --
*
* Copy a string and eliminate any backslashes that aren't in braces.
*
* Results:
* There is no return value. Count chars. get copied from src
* to dst. Along the way, if backslash sequences are found outside
* braces, the backslashes are eliminated in the copy.
* After scanning count chars. from source, a null character is
* placed at the end of dst.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
void
TclCopyAndCollapse(count, src, dst)
int count; /* Total number of characters to copy
* from src. */
register char *src; /* Copy from here... */
register char *dst; /* ... to here. */
{
register char c;
int numRead;
for (c = *src; count > 0; src++, c = *src, count--) {
if (c == '\\') {
*dst = Tcl_Backslash(src, &numRead);
dst++;
src += numRead-1;
count -= numRead-1;
} else {
*dst = c;
dst++;
}
}
*dst = 0;
}
/*
*----------------------------------------------------------------------
*
* Tcl_SplitList --
*
* Splits a list up into its constituent fields.
*
* Results
* The return value is normally TCL_OK, which means that
* the list was successfully split up. If TCL_ERROR is
* returned, it means that "list" didn't have proper list
* structure; interp->result will contain a more detailed
* error message.
*
* *argvPtr will be filled in with the address of an array
* whose elements point to the elements of list, in order.
* *argcPtr will get filled in with the number of valid elements
* in the array. A single block of memory is dynamically allocated
* to hold both the argv array and a copy of the list (with
* backslashes and braces removed in the standard way).
* The caller must eventually free this memory by calling free()
* on *argvPtr. Note: *argvPtr and *argcPtr are only modified
* if the procedure returns normally.
*
* Side effects:
* Memory is allocated.
*
*----------------------------------------------------------------------
*/
int
Tcl_SplitList(interp, list, argcPtr, argvPtr)
Tcl_Interp *interp; /* Interpreter to use for error reporting.
* If NULL, then no error message is left. */
char *list; /* Pointer to string with list structure. */
int *argcPtr; /* Pointer to location to fill in with
* the number of elements in the list. */
char ***argvPtr; /* Pointer to place to store pointer to array
* of pointers to list elements. */
{
char **argv;
register char *p;
int size, i, result, elSize, brace;
char *element;
/*
* Figure out how much space to allocate. There must be enough
* space for both the array of pointers and also for a copy of
* the list. To estimate the number of pointers needed, count
* the number of space characters in the list.
*/
for (size = 1, p = list; *p != 0; p++) {
if (isspace(UCHAR(*p))) {
size++;
}
}
size++; /* Leave space for final NULL pointer. */
argv = (char **) ckalloc((unsigned)
((size * sizeof(char *)) + (p - list) + 1));
for (i = 0, p = ((char *) argv) + size*sizeof(char *);
*list != 0; i++) {
result = TclFindElement(interp, list, &element, &list, &elSize, &brace);
if (result != TCL_OK) {
ckfree((char *) argv);
return result;
}
if (*element == 0) {
break;
}
if (i >= size) {
ckfree((char *) argv);
if (interp != NULL) {
Tcl_SetResult(interp, "internal error in Tcl_SplitList",
TCL_STATIC);
}
return TCL_ERROR;
}
argv[i] = p;
if (brace) {
strncpy(p, element, (size_t) elSize);
p += elSize;
*p = 0;
p++;
} else {
TclCopyAndCollapse(elSize, element, p);
p += elSize+1;
}
}
argv[i] = NULL;
*argvPtr = argv;
*argcPtr = i;
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_ScanElement --
*
* This procedure is a companion procedure to Tcl_ConvertElement.
* It scans a string to see what needs to be done to it (e.g.
* add backslashes or enclosing braces) to make the string into
* a valid Tcl list element.
*
* Results:
* The return value is an overestimate of the number of characters
* that will be needed by Tcl_ConvertElement to produce a valid
* list element from string. The word at *flagPtr is filled in
* with a value needed by Tcl_ConvertElement when doing the actual
* conversion.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
Tcl_ScanElement(string, flagPtr)
char *string; /* String to convert to Tcl list element. */
int *flagPtr; /* Where to store information to guide
* Tcl_ConvertElement. */
{
int flags, nestingLevel;
register char *p;
/*
* This procedure and Tcl_ConvertElement together do two things:
*
* 1. They produce a proper list, one that will yield back the
* argument strings when evaluated or when disassembled with
* Tcl_SplitList. This is the most important thing.
*
* 2. They try to produce legible output, which means minimizing the
* use of backslashes (using braces instead). However, there are
* some situations where backslashes must be used (e.g. an element
* like "{abc": the leading brace will have to be backslashed. For
* each element, one of three things must be done:
*
* (a) Use the element as-is (it doesn't contain anything special
* characters). This is the most desirable option.
*
* (b) Enclose the element in braces, but leave the contents alone.
* This happens if the element contains embedded space, or if it
* contains characters with special interpretation ($, [, ;, or \),
* or if it starts with a brace or double-quote, or if there are
* no characters in the element.
*
* (c) Don't enclose the element in braces, but add backslashes to
* prevent special interpretation of special characters. This is a
* last resort used when the argument would normally fall under case
* (b) but contains unmatched braces. It also occurs if the last
* character of the argument is a backslash or if the element contains
* a backslash followed by newline.
*
* The procedure figures out how many bytes will be needed to store
* the result (actually, it overestimates). It also collects information
* about the element in the form of a flags word.
*/
nestingLevel = 0;
flags = 0;
if (string == NULL) {
string = "";
}
p = string;
if ((*p == '{') || (*p == '"') || (*p == 0)) {
flags |= USE_BRACES;
}
for ( ; *p != 0; p++) {
switch (*p) {
case '{':
nestingLevel++;
break;
case '}':
nestingLevel--;
if (nestingLevel < 0) {
flags |= TCL_DONT_USE_BRACES|BRACES_UNMATCHED;
}
break;
case '[':
case '$':
case ';':
case ' ':
case '\f':
case '\n':
case '\r':
case '\t':
case '\v':
flags |= USE_BRACES;
break;
case '\\':
if ((p[1] == 0) || (p[1] == '\n')) {
flags = TCL_DONT_USE_BRACES;
} else {
int size;
(void) Tcl_Backslash(p, &size);
p += size-1;
flags |= USE_BRACES;
}
break;
}
}
if (nestingLevel != 0) {
flags = TCL_DONT_USE_BRACES | BRACES_UNMATCHED;
}
*flagPtr = flags;
/*
* Allow enough space to backslash every character plus leave
* two spaces for braces.
*/
return 2*(p-string) + 2;
}
/*
*----------------------------------------------------------------------
*
* Tcl_ConvertElement --
*
* This is a companion procedure to Tcl_ScanElement. Given the
* information produced by Tcl_ScanElement, this procedure converts
* a string to a list element equal to that string.
*
* Results:
* Information is copied to *dst in the form of a list element
* identical to src (i.e. if Tcl_SplitList is applied to dst it
* will produce a string identical to src). The return value is
* a count of the number of characters copied (not including the
* terminating NULL character).
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
Tcl_ConvertElement(src, dst, flags)
register char *src; /* Source information for list element. */
char *dst; /* Place to put list-ified element. */
int flags; /* Flags produced by Tcl_ScanElement. */
{
register char *p = dst;
/*
* See the comment block at the beginning of the Tcl_ScanElement
* code for details of how this works.
*/
if ((src == NULL) || (*src == 0)) {
p[0] = '{';
p[1] = '}';
p[2] = 0;
return 2;
}
if ((flags & USE_BRACES) && !(flags & TCL_DONT_USE_BRACES)) {
*p = '{';
p++;
for ( ; *src != 0; src++, p++) {
*p = *src;
}
*p = '}';
p++;
} else {
if (*src == '{') {
/*
* Can't have a leading brace unless the whole element is
* enclosed in braces. Add a backslash before the brace.
* Furthermore, this may destroy the balance between open
* and close braces, so set BRACES_UNMATCHED.
*/
p[0] = '\\';
p[1] = '{';
p += 2;
src++;
flags |= BRACES_UNMATCHED;
}
for (; *src != 0 ; src++) {
switch (*src) {
case ']':
case '[':
case '$':
case ';':
case ' ':
case '\\':
case '"':
*p = '\\';
p++;
break;
case '{':
case '}':
/*
* It may not seem necessary to backslash braces, but
* it is. The reason for this is that the resulting
* list element may actually be an element of a sub-list
* enclosed in braces (e.g. if Tcl_DStringStartSublist
* has been invoked), so there may be a brace mismatch
* if the braces aren't backslashed.
*/
if (flags & BRACES_UNMATCHED) {
*p = '\\';
p++;
}
break;
case '\f':
*p = '\\';
p++;
*p = 'f';
p++;
continue;
case '\n':
*p = '\\';
p++;
*p = 'n';
p++;
continue;
case '\r':
*p = '\\';
p++;
*p = 'r';
p++;
continue;
case '\t':
*p = '\\';
p++;
*p = 't';
p++;
continue;
case '\v':
*p = '\\';
p++;
*p = 'v';
p++;
continue;
}
*p = *src;
p++;
}
}
*p = '\0';
return p-dst;
}
/*
*----------------------------------------------------------------------
*
* Tcl_Merge --
*
* Given a collection of strings, merge them together into a
* single string that has proper Tcl list structured (i.e.
* Tcl_SplitList may be used to retrieve strings equal to the
* original elements, and Tcl_Eval will parse the string back
* into its original elements).
*
* Results:
* The return value is the address of a dynamically-allocated
* string containing the merged list.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
char *
Tcl_Merge(argc, argv)
int argc; /* How many strings to merge. */
char **argv; /* Array of string values. */
{
# define LOCAL_SIZE 20
int localFlags[LOCAL_SIZE], *flagPtr;
int numChars;
char *result;
register char *dst;
int i;
/*
* Pass 1: estimate space, gather flags.
*/
if (argc <= LOCAL_SIZE) {
flagPtr = localFlags;
} else {
flagPtr = (int *) ckalloc((unsigned) argc*sizeof(int));
}
numChars = 1;
for (i = 0; i < argc; i++) {
numChars += Tcl_ScanElement(argv[i], &flagPtr[i]) + 1;
}
/*
* Pass two: copy into the result area.
*/
result = (char *) ckalloc((unsigned) numChars);
dst = result;
for (i = 0; i < argc; i++) {
numChars = Tcl_ConvertElement(argv[i], dst, flagPtr[i]);
dst += numChars;
*dst = ' ';
dst++;
}
if (dst == result) {
*dst = 0;
} else {
dst[-1] = 0;
}
if (flagPtr != localFlags) {
ckfree((char *) flagPtr);
}
return result;
}
/*
*----------------------------------------------------------------------
*
* Tcl_Concat --
*
* Concatenate a set of strings into a single large string.
*
* Results:
* The return value is dynamically-allocated string containing
* a concatenation of all the strings in argv, with spaces between
* the original argv elements.
*
* Side effects:
* Memory is allocated for the result; the caller is responsible
* for freeing the memory.
*
*----------------------------------------------------------------------
*/
char *
Tcl_Concat(argc, argv)
int argc; /* Number of strings to concatenate. */
char **argv; /* Array of strings to concatenate. */
{
int totalSize, i;
register char *p;
char *result;
for (totalSize = 1, i = 0; i < argc; i++) {
totalSize += strlen(argv[i]) + 1;
}
result = (char *) ckalloc((unsigned) totalSize);
if (argc == 0) {
*result = '\0';
return result;
}
for (p = result, i = 0; i < argc; i++) {
char *element;
int length;
/*
* Clip white space off the front and back of the string
* to generate a neater result, and ignore any empty
* elements.
*/
element = argv[i];
while (isspace(UCHAR(*element))) {
element++;
}
for (length = strlen(element);
(length > 0) && (isspace(UCHAR(element[length-1])));
length--) {
/* Null loop body. */
}
if (length == 0) {
continue;
}
(void) strncpy(p, element, (size_t) length);
p += length;
*p = ' ';
p++;
}
if (p != result) {
p[-1] = 0;
} else {
*p = 0;
}
return result;
}
/*
*----------------------------------------------------------------------
*
* Tcl_StringMatch --
*
* See if a particular string matches a particular pattern.
*
* Results:
* The return value is 1 if string matches pattern, and
* 0 otherwise. The matching operation permits the following
* special characters in the pattern: *?\[] (see the manual
* entry for details on what these mean).
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
Tcl_StringMatch(string, pattern)
register char *string; /* String. */
register char *pattern; /* Pattern, which may contain
* special characters. */
{
char c2;
while (1) {
/* See if we're at the end of both the pattern and the string.
* If so, we succeeded. If we're at the end of the pattern
* but not at the end of the string, we failed.
*/
if (*pattern == 0) {
if (*string == 0) {
return 1;
} else {
return 0;
}
}
if ((*string == 0) && (*pattern != '*')) {
return 0;
}
/* Check for a "*" as the next pattern character. It matches
* any substring. We handle this by calling ourselves
* recursively for each postfix of string, until either we
* match or we reach the end of the string.
*/
if (*pattern == '*') {
pattern += 1;
if (*pattern == 0) {
return 1;
}
while (1) {
if (Tcl_StringMatch(string, pattern)) {
return 1;
}
if (*string == 0) {
return 0;
}
string += 1;
}
}
/* Check for a "?" as the next pattern character. It matches
* any single character.
*/
if (*pattern == '?') {
goto thisCharOK;
}
/* Check for a "[" as the next pattern character. It is followed
* by a list of characters that are acceptable, or by a range
* (two characters separated by "-").
*/
if (*pattern == '[') {
pattern += 1;
while (1) {
if ((*pattern == ']') || (*pattern == 0)) {
return 0;
}
if (*pattern == *string) {
break;
}
if (pattern[1] == '-') {
c2 = pattern[2];
if (c2 == 0) {
return 0;
}
if ((*pattern <= *string) && (c2 >= *string)) {
break;
}
if ((*pattern >= *string) && (c2 <= *string)) {
break;
}
pattern += 2;
}
pattern += 1;
}
while (*pattern != ']') {
if (*pattern == 0) {
pattern--;
break;
}
pattern += 1;
}
goto thisCharOK;
}
/* If the next pattern character is '/', just strip off the '/'
* so we do exact matching on the character that follows.
*/
if (*pattern == '\\') {
pattern += 1;
if (*pattern == 0) {
return 0;
}
}
/* There's no special character. Just make sure that the next
* characters of each string match.
*/
if (*pattern != *string) {
return 0;
}
thisCharOK: pattern += 1;
string += 1;
}
}
/*
*----------------------------------------------------------------------
*
* Tcl_SetResult --
*
* Arrange for "string" to be the Tcl return value.
*
* Results:
* None.
*
* Side effects:
* interp->result is left pointing either to "string" (if "copy" is 0)
* or to a copy of string.
*
*----------------------------------------------------------------------
*/
void
Tcl_SetResult(interp, string, freeProc)
Tcl_Interp *interp; /* Interpreter with which to associate the
* return value. */
char *string; /* Value to be returned. If NULL,
* the result is set to an empty string. */
Tcl_FreeProc *freeProc; /* Gives information about the string:
* TCL_STATIC, TCL_VOLATILE, or the address
* of a Tcl_FreeProc such as free. */
{
register Interp *iPtr = (Interp *) interp;
int length;
Tcl_FreeProc *oldFreeProc = iPtr->freeProc;
char *oldResult = iPtr->result;
if (string == NULL) {
iPtr->resultSpace[0] = 0;
iPtr->result = iPtr->resultSpace;
iPtr->freeProc = 0;
} else if (freeProc == TCL_VOLATILE) {
length = strlen(string);
if (length > TCL_RESULT_SIZE) {
iPtr->result = (char *) ckalloc((unsigned) length+1);
iPtr->freeProc = TCL_DYNAMIC;
} else {
iPtr->result = iPtr->resultSpace;
iPtr->freeProc = 0;
}
strcpy(iPtr->result, string);
} else {
iPtr->result = string;
iPtr->freeProc = freeProc;
}
/*
* If the old result was dynamically-allocated, free it up. Do it
* here, rather than at the beginning, in case the new result value
* was part of the old result value.
*/
if (oldFreeProc != 0) {
if ((oldFreeProc == TCL_DYNAMIC)
|| (oldFreeProc == (Tcl_FreeProc *) free)) {
ckfree(oldResult);
} else {
(*oldFreeProc)(oldResult);
}
}
}
/*
*----------------------------------------------------------------------
*
* Tcl_AppendResult --
*
* Append a variable number of strings onto the result already
* present for an interpreter.
*
* Results:
* None.
*
* Side effects:
* The result in the interpreter given by the first argument
* is extended by the strings given by the second and following
* arguments (up to a terminating NULL argument).
*
*----------------------------------------------------------------------
*/
/* VARARGS2 */
void
Tcl_AppendResult TCL_VARARGS_DEF(Tcl_Interp *,arg1)
{
va_list argList;
register Interp *iPtr;
char *string;
int newSpace;
/*
* First, scan through all the arguments to see how much space is
* needed.
*/
iPtr = (Interp *) TCL_VARARGS_START(Tcl_Interp *,arg1,argList);
newSpace = 0;
while (1) {
string = va_arg(argList, char *);
if (string == NULL) {
break;
}
newSpace += strlen(string);
}
va_end(argList);
/*
* If the append buffer isn't already setup and large enough
* to hold the new data, set it up.
*/
if ((iPtr->result != iPtr->appendResult)
|| (iPtr->appendResult[iPtr->appendUsed] != 0)
|| ((newSpace + iPtr->appendUsed) >= iPtr->appendAvl)) {
SetupAppendBuffer(iPtr, newSpace);
}
/*
* Final step: go through all the argument strings again, copying
* them into the buffer.
*/
TCL_VARARGS_START(Tcl_Interp *,arg1,argList);
while (1) {
string = va_arg(argList, char *);
if (string == NULL) {
break;
}
strcpy(iPtr->appendResult + iPtr->appendUsed, string);
iPtr->appendUsed += strlen(string);
}
va_end(argList);
}
/*
*----------------------------------------------------------------------
*
* Tcl_AppendElement --
*
* Convert a string to a valid Tcl list element and append it
* to the current result (which is ostensibly a list).
*
* Results:
* None.
*
* Side effects:
* The result in the interpreter given by the first argument
* is extended with a list element converted from string. A
* separator space is added before the converted list element
* unless the current result is empty, contains the single
* character "{", or ends in " {".
*
*----------------------------------------------------------------------
*/
void
Tcl_AppendElement(interp, string)
Tcl_Interp *interp; /* Interpreter whose result is to be
* extended. */
char *string; /* String to convert to list element and
* add to result. */
{
register Interp *iPtr = (Interp *) interp;
int size, flags;
char *dst;
/*
* See how much space is needed, and grow the append buffer if
* needed to accommodate the list element.
*/
size = Tcl_ScanElement(string, &flags) + 1;
if ((iPtr->result != iPtr->appendResult)
|| (iPtr->appendResult[iPtr->appendUsed] != 0)
|| ((size + iPtr->appendUsed) >= iPtr->appendAvl)) {
SetupAppendBuffer(iPtr, size+iPtr->appendUsed);
}
/*
* Convert the string into a list element and copy it to the
* buffer that's forming, with a space separator if needed.
*/
dst = iPtr->appendResult + iPtr->appendUsed;
if (TclNeedSpace(iPtr->appendResult, dst)) {
iPtr->appendUsed++;
*dst = ' ';
dst++;
}
iPtr->appendUsed += Tcl_ConvertElement(string, dst, flags);
}
/*
*----------------------------------------------------------------------
*
* SetupAppendBuffer --
*
* This procedure makes sure that there is an append buffer
* properly initialized for interp, and that it has at least
* enough room to accommodate newSpace new bytes of information.
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static void
SetupAppendBuffer(iPtr, newSpace)
register Interp *iPtr; /* Interpreter whose result is being set up. */
int newSpace; /* Make sure that at least this many bytes
* of new information may be added. */
{
int totalSpace;
/*
* Make the append buffer larger, if that's necessary, then
* copy the current result into the append buffer and make the
* append buffer the official Tcl result.
*/
if (iPtr->result != iPtr->appendResult) {
/*
* If an oversized buffer was used recently, then free it up
* so we go back to a smaller buffer. This avoids tying up
* memory forever after a large operation.
*/
if (iPtr->appendAvl > 500) {
ckfree(iPtr->appendResult);
iPtr->appendResult = NULL;
iPtr->appendAvl = 0;
}
iPtr->appendUsed = strlen(iPtr->result);
} else if (iPtr->result[iPtr->appendUsed] != 0) {
/*
* Most likely someone has modified a result created by
* Tcl_AppendResult et al. so that it has a different size.
* Just recompute the size.
*/
iPtr->appendUsed = strlen(iPtr->result);
}
totalSpace = newSpace + iPtr->appendUsed;
if (totalSpace >= iPtr->appendAvl) {
char *new;
if (totalSpace < 100) {
totalSpace = 200;
} else {
totalSpace *= 2;
}
new = (char *) ckalloc((unsigned) totalSpace);
strcpy(new, iPtr->result);
if (iPtr->appendResult != NULL) {
ckfree(iPtr->appendResult);
}
iPtr->appendResult = new;
iPtr->appendAvl = totalSpace;
} else if (iPtr->result != iPtr->appendResult) {
strcpy(iPtr->appendResult, iPtr->result);
}
Tcl_FreeResult(iPtr);
iPtr->result = iPtr->appendResult;
}
/*
*----------------------------------------------------------------------
*
* Tcl_ResetResult --
*
* This procedure restores the result area for an interpreter
* to its default initialized state, freeing up any memory that
* may have been allocated for the result and clearing any
* error information for the interpreter.
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
void
Tcl_ResetResult(interp)
Tcl_Interp *interp; /* Interpreter for which to clear result. */
{
register Interp *iPtr = (Interp *) interp;
Tcl_FreeResult(iPtr);
iPtr->result = iPtr->resultSpace;
iPtr->resultSpace[0] = 0;
iPtr->flags &=
~(ERR_ALREADY_LOGGED | ERR_IN_PROGRESS | ERROR_CODE_SET);
}
/*
*----------------------------------------------------------------------
*
* Tcl_SetErrorCode --
*
* This procedure is called to record machine-readable information
* about an error that is about to be returned.
*
* Results:
* None.
*
* Side effects:
* The errorCode global variable is modified to hold all of the
* arguments to this procedure, in a list form with each argument
* becoming one element of the list. A flag is set internally
* to remember that errorCode has been set, so the variable doesn't
* get set automatically when the error is returned.
*
*----------------------------------------------------------------------
*/
/* VARARGS2 */
void
Tcl_SetErrorCode TCL_VARARGS_DEF(Tcl_Interp *,arg1)
{
va_list argList;
char *string;
int flags;
Interp *iPtr;
/*
* Scan through the arguments one at a time, appending them to
* $errorCode as list elements.
*/
iPtr = (Interp *) TCL_VARARGS_START(Tcl_Interp *,arg1,argList);
flags = TCL_GLOBAL_ONLY | TCL_LIST_ELEMENT;
while (1) {
string = va_arg(argList, char *);
if (string == NULL) {
break;
}
(void) Tcl_SetVar2((Tcl_Interp *) iPtr, "errorCode",
(char *) NULL, string, flags);
flags |= TCL_APPEND_VALUE;
}
va_end(argList);
iPtr->flags |= ERROR_CODE_SET;
}
/*
*----------------------------------------------------------------------
*
* TclGetListIndex --
*
* Parse a list index, which may be either an integer or the
* value "end".
*
* Results:
* The return value is either TCL_OK or TCL_ERROR. If it is
* TCL_OK, then the index corresponding to string is left in
* *indexPtr. If the return value is TCL_ERROR, then string
* was bogus; an error message is returned in interp->result.
* If a negative index is specified, it is rounded up to 0.
* The index value may be larger than the size of the list
* (this happens when "end" is specified).
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
TclGetListIndex(interp, string, indexPtr)
Tcl_Interp *interp; /* Interpreter for error reporting. */
char *string; /* String containing list index. */
int *indexPtr; /* Where to store index. */
{
if (isdigit(UCHAR(*string)) || (*string == '-')) {
if (Tcl_GetInt(interp, string, indexPtr) != TCL_OK) {
return TCL_ERROR;
}
if (*indexPtr < 0) {
*indexPtr = 0;
}
} else if (strncmp(string, "end", strlen(string)) == 0) {
*indexPtr = INT_MAX;
} else {
Tcl_AppendResult(interp, "bad index \"", string,
"\": must be integer or \"end\"", (char *) NULL);
return TCL_ERROR;
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_RegExpCompile --
*
* Compile a regular expression into a form suitable for fast
* matching. This procedure retains a small cache of pre-compiled
* regular expressions in the interpreter, in order to avoid
* compilation costs as much as possible.
*
* Results:
* The return value is a pointer to the compiled form of string,
* suitable for passing to Tcl_RegExpExec. This compiled form
* is only valid up until the next call to this procedure, so
* don't keep these around for a long time! If an error occurred
* while compiling the pattern, then NULL is returned and an error
* message is left in interp->result.
*
* Side effects:
* The cache of compiled regexp's in interp will be modified to
* hold information for string, if such information isn't already
* present in the cache.
*
*----------------------------------------------------------------------
*/
Tcl_RegExp
Tcl_RegExpCompile(interp, string)
Tcl_Interp *interp; /* For use in error reporting. */
char *string; /* String for which to produce
* compiled regular expression. */
{
register Interp *iPtr = (Interp *) interp;
int i, length;
regexp *result;
length = strlen(string);
for (i = 0; i < NUM_REGEXPS; i++) {
if ((length == iPtr->patLengths[i])
&& (strcmp(string, iPtr->patterns[i]) == 0)) {
/*
* Move the matched pattern to the first slot in the
* cache and shift the other patterns down one position.
*/
if (i != 0) {
int j;
char *cachedString;
cachedString = iPtr->patterns[i];
result = iPtr->regexps[i];
for (j = i-1; j >= 0; j--) {
iPtr->patterns[j+1] = iPtr->patterns[j];
iPtr->patLengths[j+1] = iPtr->patLengths[j];
iPtr->regexps[j+1] = iPtr->regexps[j];
}
iPtr->patterns[0] = cachedString;
iPtr->patLengths[0] = length;
iPtr->regexps[0] = result;
}
return (Tcl_RegExp) iPtr->regexps[0];
}
}
/*
* No match in the cache. Compile the string and add it to the
* cache.
*/
TclRegError((char *) NULL);
result = TclRegComp(string);
if (TclGetRegError() != NULL) {
Tcl_AppendResult(interp,
"couldn't compile regular expression pattern: ",
TclGetRegError(), (char *) NULL);
return NULL;
}
if (iPtr->patterns[NUM_REGEXPS-1] != NULL) {
ckfree(iPtr->patterns[NUM_REGEXPS-1]);
ckfree((char *) iPtr->regexps[NUM_REGEXPS-1]);
}
for (i = NUM_REGEXPS - 2; i >= 0; i--) {
iPtr->patterns[i+1] = iPtr->patterns[i];
iPtr->patLengths[i+1] = iPtr->patLengths[i];
iPtr->regexps[i+1] = iPtr->regexps[i];
}
iPtr->patterns[0] = (char *) ckalloc((unsigned) (length+1));
strcpy(iPtr->patterns[0], string);
iPtr->patLengths[0] = length;
iPtr->regexps[0] = result;
return (Tcl_RegExp) result;
}
/*
*----------------------------------------------------------------------
*
* Tcl_RegExpExec --
*
* Execute the regular expression matcher using a compiled form
* of a regular expression and save information about any match
* that is found.
*
* Results:
* If an error occurs during the matching operation then -1
* is returned and interp->result contains an error message.
* Otherwise the return value is 1 if a matching range is
* found and 0 if there is no matching range.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
Tcl_RegExpExec(interp, re, string, start)
Tcl_Interp *interp; /* Interpreter to use for error reporting. */
Tcl_RegExp re; /* Compiled regular expression; must have
* been returned by previous call to
* Tcl_RegExpCompile. */
char *string; /* String against which to match re. */
char *start; /* If string is part of a larger string,
* this identifies beginning of larger
* string, so that "^" won't match. */
{
int match;
regexp *regexpPtr = (regexp *) re;
TclRegError((char *) NULL);
match = TclRegExec(regexpPtr, string, start);
if (TclGetRegError() != NULL) {
Tcl_ResetResult(interp);
Tcl_AppendResult(interp, "error while matching regular expression: ",
TclGetRegError(), (char *) NULL);
return -1;
}
return match;
}
/*
*----------------------------------------------------------------------
*
* Tcl_RegExpRange --
*
* Returns pointers describing the range of a regular expression match,
* or one of the subranges within the match.
*
* Results:
* The variables at *startPtr and *endPtr are modified to hold the
* addresses of the endpoints of the range given by index. If the
* specified range doesn't exist then NULLs are returned.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
void
Tcl_RegExpRange(re, index, startPtr, endPtr)
Tcl_RegExp re; /* Compiled regular expression that has
* been passed to Tcl_RegExpExec. */
int index; /* 0 means give the range of the entire
* match, > 0 means give the range of
* a matching subrange. Must be no greater
* than NSUBEXP. */
char **startPtr; /* Store address of first character in
* (sub-) range here. */
char **endPtr; /* Store address of character just after last
* in (sub-) range here. */
{
regexp *regexpPtr = (regexp *) re;
if (index >= NSUBEXP) {
*startPtr = *endPtr = NULL;
} else {
*startPtr = regexpPtr->startp[index];
*endPtr = regexpPtr->endp[index];
}
}
/*
*----------------------------------------------------------------------
*
* Tcl_RegExpMatch --
*
* See if a string matches a regular expression.
*
* Results:
* If an error occurs during the matching operation then -1
* is returned and interp->result contains an error message.
* Otherwise the return value is 1 if "string" matches "pattern"
* and 0 otherwise.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
Tcl_RegExpMatch(interp, string, pattern)
Tcl_Interp *interp; /* Used for error reporting. */
char *string; /* String. */
char *pattern; /* Regular expression to match against
* string. */
{
Tcl_RegExp re;
re = Tcl_RegExpCompile(interp, pattern);
if (re == NULL) {
return -1;
}
return Tcl_RegExpExec(interp, re, string, string);
}
/*
*----------------------------------------------------------------------
*
* Tcl_DStringInit --
*
* Initializes a dynamic string, discarding any previous contents
* of the string (Tcl_DStringFree should have been called already
* if the dynamic string was previously in use).
*
* Results:
* None.
*
* Side effects:
* The dynamic string is initialized to be empty.
*
*----------------------------------------------------------------------
*/
void
Tcl_DStringInit(dsPtr)
register Tcl_DString *dsPtr; /* Pointer to structure for
* dynamic string. */
{
dsPtr->string = dsPtr->staticSpace;
dsPtr->length = 0;
dsPtr->spaceAvl = TCL_DSTRING_STATIC_SIZE;
dsPtr->staticSpace[0] = 0;
}
/*
*----------------------------------------------------------------------
*
* Tcl_DStringAppend --
*
* Append more characters to the current value of a dynamic string.
*
* Results:
* The return value is a pointer to the dynamic string's new value.
*
* Side effects:
* Length bytes from string (or all of string if length is less
* than zero) are added to the current value of the string. Memory
* gets reallocated if needed to accomodate the string's new size.
*
*----------------------------------------------------------------------
*/
char *
Tcl_DStringAppend(dsPtr, string, length)
register Tcl_DString *dsPtr; /* Structure describing dynamic
* string. */
char *string; /* String to append. If length is
* -1 then this must be
* null-terminated. */
int length; /* Number of characters from string
* to append. If < 0, then append all
* of string, up to null at end. */
{
int newSize;
char *newString, *dst, *end;
if (length < 0) {
length = strlen(string);
}
newSize = length + dsPtr->length;
/*
* Allocate a larger buffer for the string if the current one isn't
* large enough. Allocate extra space in the new buffer so that there
* will be room to grow before we have to allocate again.
*/
if (newSize >= dsPtr->spaceAvl) {
dsPtr->spaceAvl = newSize*2;
newString = (char *) ckalloc((unsigned) dsPtr->spaceAvl);
memcpy((VOID *)newString, (VOID *) dsPtr->string,
(size_t) dsPtr->length);
if (dsPtr->string != dsPtr->staticSpace) {
ckfree(dsPtr->string);
}
dsPtr->string = newString;
}
/*
* Copy the new string into the buffer at the end of the old
* one.
*/
for (dst = dsPtr->string + dsPtr->length, end = string+length;
string < end; string++, dst++) {
*dst = *string;
}
*dst = 0;
dsPtr->length += length;
return dsPtr->string;
}
/*
*----------------------------------------------------------------------
*
* Tcl_DStringAppendElement --
*
* Append a list element to the current value of a dynamic string.
*
* Results:
* The return value is a pointer to the dynamic string's new value.
*
* Side effects:
* String is reformatted as a list element and added to the current
* value of the string. Memory gets reallocated if needed to
* accomodate the string's new size.
*
*----------------------------------------------------------------------
*/
char *
Tcl_DStringAppendElement(dsPtr, string)
register Tcl_DString *dsPtr; /* Structure describing dynamic
* string. */
char *string; /* String to append. Must be
* null-terminated. */
{
int newSize, flags;
char *dst, *newString;
newSize = Tcl_ScanElement(string, &flags) + dsPtr->length + 1;
/*
* Allocate a larger buffer for the string if the current one isn't
* large enough. Allocate extra space in the new buffer so that there
* will be room to grow before we have to allocate again.
* SPECIAL NOTE: must use memcpy, not strcpy, to copy the string
* to a larger buffer, since there may be embedded NULLs in the
* string in some cases.
*/
if (newSize >= dsPtr->spaceAvl) {
dsPtr->spaceAvl = newSize*2;
newString = (char *) ckalloc((unsigned) dsPtr->spaceAvl);
memcpy((VOID *) newString, (VOID *) dsPtr->string,
(size_t) dsPtr->length);
if (dsPtr->string != dsPtr->staticSpace) {
ckfree(dsPtr->string);
}
dsPtr->string = newString;
}
/*
* Convert the new string to a list element and copy it into the
* buffer at the end, with a space, if needed.
*/
dst = dsPtr->string + dsPtr->length;
if (TclNeedSpace(dsPtr->string, dst)) {
*dst = ' ';
dst++;
dsPtr->length++;
}
dsPtr->length += Tcl_ConvertElement(string, dst, flags);
return dsPtr->string;
}
/*
*----------------------------------------------------------------------
*
* Tcl_DStringSetLength --
*
* Change the length of a dynamic string. This can cause the
* string to either grow or shrink, depending on the value of
* length.
*
* Results:
* None.
*
* Side effects:
* The length of dsPtr is changed to length and a null byte is
* stored at that position in the string. If length is larger
* than the space allocated for dsPtr, then a panic occurs.
*
*----------------------------------------------------------------------
*/
void
Tcl_DStringSetLength(dsPtr, length)
register Tcl_DString *dsPtr; /* Structure describing dynamic
* string. */
int length; /* New length for dynamic string. */
{
if (length < 0) {
length = 0;
}
if (length >= dsPtr->spaceAvl) {
char *newString;
dsPtr->spaceAvl = length+1;
newString = (char *) ckalloc((unsigned) dsPtr->spaceAvl);
/*
* SPECIAL NOTE: must use memcpy, not strcpy, to copy the string
* to a larger buffer, since there may be embedded NULLs in the
* string in some cases.
*/
memcpy((VOID *) newString, (VOID *) dsPtr->string,
(size_t) dsPtr->length);
if (dsPtr->string != dsPtr->staticSpace) {
ckfree(dsPtr->string);
}
dsPtr->string = newString;
}
dsPtr->length = length;
dsPtr->string[length] = 0;
}
/*
*----------------------------------------------------------------------
*
* Tcl_DStringFree --
*
* Frees up any memory allocated for the dynamic string and
* reinitializes the string to an empty state.
*
* Results:
* None.
*
* Side effects:
* The previous contents of the dynamic string are lost, and
* the new value is an empty string.
*
*----------------------------------------------------------------------
*/
void
Tcl_DStringFree(dsPtr)
register Tcl_DString *dsPtr; /* Structure describing dynamic
* string. */
{
if (dsPtr->string != dsPtr->staticSpace) {
ckfree(dsPtr->string);
}
dsPtr->string = dsPtr->staticSpace;
dsPtr->length = 0;
dsPtr->spaceAvl = TCL_DSTRING_STATIC_SIZE;
dsPtr->staticSpace[0] = 0;
}
/*
*----------------------------------------------------------------------
*
* Tcl_DStringResult --
*
* This procedure moves the value of a dynamic string into an
* interpreter as its result. The string itself is reinitialized
* to an empty string.
*
* Results:
* None.
*
* Side effects:
* The string is "moved" to interp's result, and any existing
* result for interp is freed up. DsPtr is reinitialized to
* an empty string.
*
*----------------------------------------------------------------------
*/
void
Tcl_DStringResult(interp, dsPtr)
Tcl_Interp *interp; /* Interpreter whose result is to be
* reset. */
Tcl_DString *dsPtr; /* Dynamic string that is to become
* the result of interp. */
{
Tcl_ResetResult(interp);
if (dsPtr->string != dsPtr->staticSpace) {
interp->result = dsPtr->string;
interp->freeProc = TCL_DYNAMIC;
} else if (dsPtr->length < TCL_RESULT_SIZE) {
interp->result = ((Interp *) interp)->resultSpace;
strcpy(interp->result, dsPtr->string);
} else {
Tcl_SetResult(interp, dsPtr->string, TCL_VOLATILE);
}
dsPtr->string = dsPtr->staticSpace;
dsPtr->length = 0;
dsPtr->spaceAvl = TCL_DSTRING_STATIC_SIZE;
dsPtr->staticSpace[0] = 0;
}
/*
*----------------------------------------------------------------------
*
* Tcl_DStringGetResult --
*
* This procedure moves the result of an interpreter into a
* dynamic string.
*
* Results:
* None.
*
* Side effects:
* The interpreter's result is cleared, and the previous contents
* of dsPtr are freed.
*
*----------------------------------------------------------------------
*/
void
Tcl_DStringGetResult(interp, dsPtr)
Tcl_Interp *interp; /* Interpreter whose result is to be
* reset. */
Tcl_DString *dsPtr; /* Dynamic string that is to become
* the result of interp. */
{
Interp *iPtr = (Interp *) interp;
if (dsPtr->string != dsPtr->staticSpace) {
ckfree(dsPtr->string);
}
dsPtr->length = strlen(iPtr->result);
if (iPtr->freeProc != NULL) {
if ((iPtr->freeProc == TCL_DYNAMIC)
|| (iPtr->freeProc == (Tcl_FreeProc *) free)) {
dsPtr->string = iPtr->result;
dsPtr->spaceAvl = dsPtr->length+1;
} else {
dsPtr->string = (char *) ckalloc((unsigned) (dsPtr->length+1));
strcpy(dsPtr->string, iPtr->result);
(*iPtr->freeProc)(iPtr->result);
}
dsPtr->spaceAvl = dsPtr->length+1;
iPtr->freeProc = NULL;
} else {
if (dsPtr->length < TCL_DSTRING_STATIC_SIZE) {
dsPtr->string = dsPtr->staticSpace;
dsPtr->spaceAvl = TCL_DSTRING_STATIC_SIZE;
} else {
dsPtr->string = (char *) ckalloc((unsigned) (dsPtr->length + 1));
dsPtr->spaceAvl = dsPtr->length + 1;
}
strcpy(dsPtr->string, iPtr->result);
}
iPtr->result = iPtr->resultSpace;
iPtr->resultSpace[0] = 0;
}
/*
*----------------------------------------------------------------------
*
* Tcl_DStringStartSublist --
*
* This procedure adds the necessary information to a dynamic
* string (e.g. " {" to start a sublist. Future element
* appends will be in the sublist rather than the main list.
*
* Results:
* None.
*
* Side effects:
* Characters get added to the dynamic string.
*
*----------------------------------------------------------------------
*/
void
Tcl_DStringStartSublist(dsPtr)
Tcl_DString *dsPtr; /* Dynamic string. */
{
if (TclNeedSpace(dsPtr->string, dsPtr->string + dsPtr->length)) {
Tcl_DStringAppend(dsPtr, " {", -1);
} else {
Tcl_DStringAppend(dsPtr, "{", -1);
}
}
/*
*----------------------------------------------------------------------
*
* Tcl_DStringEndSublist --
*
* This procedure adds the necessary characters to a dynamic
* string to end a sublist (e.g. "}"). Future element appends
* will be in the enclosing (sub)list rather than the current
* sublist.
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
void
Tcl_DStringEndSublist(dsPtr)
Tcl_DString *dsPtr; /* Dynamic string. */
{
Tcl_DStringAppend(dsPtr, "}", -1);
}
/*
*----------------------------------------------------------------------
*
* Tcl_PrintDouble --
*
* Given a floating-point value, this procedure converts it to
* an ASCII string using.
*
* Results:
* The ASCII equivalent of "value" is written at "dst". It is
* written using the current precision, and it is guaranteed to
* contain a decimal point or exponent, so that it looks like
* a floating-point value and not an integer.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
void
Tcl_PrintDouble(interp, value, dst)
Tcl_Interp *interp; /* Interpreter whose tcl_precision
* variable controls printing. */
double value; /* Value to print as string. */
char *dst; /* Where to store converted value;
* must have at least TCL_DOUBLE_SPACE
* characters. */
{
register char *p;
sprintf(dst, ((Interp *) interp)->pdFormat, value);
/*
* If the ASCII result looks like an integer, add ".0" so that it
* doesn't look like an integer anymore. This prevents floating-point
* values from being converted to integers unintentionally.
*/
for (p = dst; *p != 0; p++) {
if ((*p == '.') || (isalpha(UCHAR(*p)))) {
return;
}
}
p[0] = '.';
p[1] = '0';
p[2] = 0;
}
/*
*----------------------------------------------------------------------
*
* TclPrecTraceProc --
*
* This procedure is invoked whenever the variable "tcl_precision"
* is written.
*
* Results:
* Returns NULL if all went well, or an error message if the
* new value for the variable doesn't make sense.
*
* Side effects:
* If the new value doesn't make sense then this procedure
* undoes the effect of the variable modification. Otherwise
* it modifies the format string that's used by Tcl_PrintDouble.
*
*----------------------------------------------------------------------
*/
/* ARGSUSED */
char *
TclPrecTraceProc(clientData, interp, name1, name2, flags)
ClientData clientData; /* Not used. */
Tcl_Interp *interp; /* Interpreter containing variable. */
char *name1; /* Name of variable. */
char *name2; /* Second part of variable name. */
int flags; /* Information about what happened. */
{
register Interp *iPtr = (Interp *) interp;
char *value, *end;
int prec;
/*
* If the variable is unset, then recreate the trace and restore
* the default value of the format string.
*/
if (flags & TCL_TRACE_UNSETS) {
if ((flags & TCL_TRACE_DESTROYED) && !(flags & TCL_INTERP_DESTROYED)) {
Tcl_TraceVar2(interp, name1, name2,
TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
TclPrecTraceProc, clientData);
}
strcpy(iPtr->pdFormat, DEFAULT_PD_FORMAT);
iPtr->pdPrec = DEFAULT_PD_PREC;
return (char *) NULL;
}
value = Tcl_GetVar2(interp, name1, name2, flags & TCL_GLOBAL_ONLY);
if (value == NULL) {
value = "";
}
prec = strtoul(value, &end, 10);
if ((prec <= 0) || (prec > TCL_MAX_PREC) || (prec > 100) ||
(end == value) || (*end != 0)) {
char oldValue[10];
sprintf(oldValue, "%d", iPtr->pdPrec);
Tcl_SetVar2(interp, name1, name2, oldValue, flags & TCL_GLOBAL_ONLY);
return "improper value for precision";
}
sprintf(iPtr->pdFormat, "%%.%dg", prec);
iPtr->pdPrec = prec;
return (char *) NULL;
}
/*
*----------------------------------------------------------------------
*
* TclNeedSpace --
*
* This procedure checks to see whether it is appropriate to
* add a space before appending a new list element to an
* existing string.
*
* Results:
* The return value is 1 if a space is appropriate, 0 otherwise.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
TclNeedSpace(start, end)
char *start; /* First character in string. */
char *end; /* End of string (place where space will
* be added, if appropriate). */
{
/*
* A space is needed unless either
* (a) we're at the start of the string, or
* (b) the trailing characters of the string consist of one or more
* open curly braces preceded by a space or extending back to
* the beginning of the string.
* (c) the trailing characters of the string consist of a space
* preceded by a character other than backslash.
*/
if (end == start) {
return 0;
}
end--;
if (*end != '{') {
if (isspace(UCHAR(*end)) && ((end == start) || (end[-1] != '\\'))) {
return 0;
}
return 1;
}
do {
if (end == start) {
return 0;
}
end--;
} while (*end == '{');
if (isspace(UCHAR(*end))) {
return 0;
}
return 1;
}
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