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Overview
| Comment: | Make TclTrim* routines robust against some malformation in inputs. Better than access violations and panics! |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | core-8-5-branch |
| Files: | files | file ages | folders |
| SHA3-256: |
e2a4fef6e100cfcf1012e4e6689e8269 |
| User & Date: | dgp 2018-03-14 00:03:59 |
Context
|
2018-03-14
| ||
| 00:53 | merge 8.5 check-in: 4fd30be85b user: dgp tags: core-8-6-branch | |
| 00:45 | TclTrim must write to *trimRight even when making a quick exit. check-in: 8b3e6a3ee5 user: dgp tags: core-8-5-branch | |
| 00:03 | Make TclTrim* routines robust against some malformation in inputs. Better than access violations and... check-in: e2a4fef6e1 user: dgp tags: core-8-5-branch | |
|
2018-03-13
| ||
| 23:56 | A few minor revisions. Closed-Leaf check-in: d8df7220e3 user: dgp tags: sebres-8-5-fix-trim-on-mailformed | |
| 03:15 | Tidy up and comment [string replace] and its corner cases. check-in: dfe3934edb user: dgp tags: core-8-5-branch | |
Changes
Changes to generic/tclCmdMZ.c.
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length2 = strlen(string2);
} else {
Tcl_WrongNumArgs(interp, 1, objv, "string ?chars?");
return TCL_ERROR;
}
string1 = TclGetStringFromObj(objv[1], &length1);
triml = TclTrimLeft(string1, length1, string2, length2);
trimr = TclTrimRight(string1 + triml, length1 - triml, string2, length2);
Tcl_SetObjResult(interp,
Tcl_NewStringObj(string1 + triml, length1 - triml - trimr));
return TCL_OK;
}
/*
|
| < |
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length2 = strlen(string2);
} else {
Tcl_WrongNumArgs(interp, 1, objv, "string ?chars?");
return TCL_ERROR;
}
string1 = TclGetStringFromObj(objv[1], &length1);
triml = TclTrim(string1, length1, string2, length2, &trimr);
Tcl_SetObjResult(interp,
Tcl_NewStringObj(string1 + triml, length1 - triml - trimr));
return TCL_OK;
}
/*
|
Changes to generic/tclInt.h.
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Tcl_Obj *patternObj, int flags); MODULE_SCOPE Tcl_Obj * TclStringObjReverse(Tcl_Obj *objPtr); MODULE_SCOPE int TclSubstTokens(Tcl_Interp *interp, Tcl_Token *tokenPtr, int count, int *tokensLeftPtr, int line, int *clNextOuter, CONST char *outerScript); MODULE_SCOPE void TclTransferResult(Tcl_Interp *sourceInterp, int result, Tcl_Interp *targetInterp); MODULE_SCOPE int TclTrimLeft(const char *bytes, int numBytes, const char *trim, int numTrim); MODULE_SCOPE int TclTrimRight(const char *bytes, int numBytes, const char *trim, int numTrim); MODULE_SCOPE Tcl_Obj * TclpNativeToNormalized(ClientData clientData); MODULE_SCOPE Tcl_Obj * TclpFilesystemPathType(Tcl_Obj *pathPtr); MODULE_SCOPE Tcl_PackageInitProc *TclpFindSymbol(Tcl_Interp *interp, |
> > |
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Tcl_Obj *patternObj, int flags); MODULE_SCOPE Tcl_Obj * TclStringObjReverse(Tcl_Obj *objPtr); MODULE_SCOPE int TclSubstTokens(Tcl_Interp *interp, Tcl_Token *tokenPtr, int count, int *tokensLeftPtr, int line, int *clNextOuter, CONST char *outerScript); MODULE_SCOPE void TclTransferResult(Tcl_Interp *sourceInterp, int result, Tcl_Interp *targetInterp); MODULE_SCOPE int TclTrim(const char *bytes, int numBytes, const char *trim, int numTrim, int *trimRight); MODULE_SCOPE int TclTrimLeft(const char *bytes, int numBytes, const char *trim, int numTrim); MODULE_SCOPE int TclTrimRight(const char *bytes, int numBytes, const char *trim, int numTrim); MODULE_SCOPE Tcl_Obj * TclpNativeToNormalized(ClientData clientData); MODULE_SCOPE Tcl_Obj * TclpFilesystemPathType(Tcl_Obj *pathPtr); MODULE_SCOPE Tcl_PackageInitProc *TclpFindSymbol(Tcl_Interp *interp, |
Changes to generic/tclUtil.c.
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TclUtfToUniChar(buf, &ch);
return (char) ch;
}
/*
*----------------------------------------------------------------------
*
* TclTrimRight --
* Takes two counted strings in the Tcl encoding which must both be
* null terminated. Conceptually trims from the right side of the
* first string all characters found in the second string.
*
* Results:
* The number of bytes to be removed from the end of the string.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
TclTrimRight(
const char *bytes, /* String to be trimmed... */
int numBytes, /* ...and its length in bytes */
const char *trim, /* String of trim characters... */
int numTrim) /* ...and its length in bytes */
{
const char *p = bytes + numBytes;
int pInc;
if ((bytes[numBytes] != '\0') || (trim[numTrim] != '\0')) {
Tcl_Panic("TclTrimRight works only on null-terminated strings");
}
/* Empty strings -> nothing to do */
if ((numBytes == 0) || (numTrim == 0)) {
return 0;
}
/* Outer loop: iterate over string to be trimmed */
do {
Tcl_UniChar ch1;
const char *q = trim;
int bytesLeft = numTrim;
p = Tcl_UtfPrev(p, bytes);
................................................................................
p += pInc;
break;
}
} while (p > bytes);
return numBytes - (p - bytes);
}
/*
*----------------------------------------------------------------------
*
* TclTrimLeft --
* Takes two counted strings in the Tcl encoding which must both be
* null terminated. Conceptually trims from the left side of the
* first string all characters found in the second string.
*
* Results:
* The number of bytes to be removed from the start of the string.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
TclTrimLeft(
const char *bytes, /* String to be trimmed... */
int numBytes, /* ...and its length in bytes */
const char *trim, /* String of trim characters... */
int numTrim) /* ...and its length in bytes */
{
const char *p = bytes;
if ((bytes[numBytes] != '\0') || (trim[numTrim] != '\0')) {
Tcl_Panic("TclTrimLeft works only on null-terminated strings");
}
/* Empty strings -> nothing to do */
if ((numBytes == 0) || (numTrim == 0)) {
return 0;
}
/* Outer loop: iterate over string to be trimmed */
do {
Tcl_UniChar ch1;
int pInc = TclUtfToUniChar(p, &ch1);
const char *q = trim;
int bytesLeft = numTrim;
................................................................................
if (bytesLeft == 0) {
/* No match; trim task done; *p is first non-trimmed char */
break;
}
p += pInc;
numBytes -= pInc;
} while (numBytes);
return p - bytes;
}
/*
*----------------------------------------------------------------------
*
* Tcl_Concat --
*
* Concatenate a set of strings into a single large string.
................................................................................
*/
Tcl_Panic("Tcl_Concat: max size of Tcl value exceeded");
}
/* All element bytes + (argc - 1) spaces + 1 terminating NULL */
result = (char *) ckalloc((unsigned) (bytesNeeded + argc));
for (p = result, i = 0; i < argc; i++) {
int trim, elemLength;
const char *element;
element = argv[i];
elemLength = strlen(argv[i]);
/* Trim away the leading whitespace */
trim = TclTrimLeft(element, elemLength, CONCAT_WS, CONCAT_WS_SIZE);
element += trim;
elemLength -= trim;
/*
* Trim away the trailing whitespace. Do not permit trimming
* to expose a final backslash character.
*/
trim = TclTrimRight(element, elemLength, CONCAT_WS, CONCAT_WS_SIZE);
trim -= trim && (element[elemLength - trim - 1] == '\\');
elemLength -= trim;
/* If we're left with empty element after trimming, do nothing */
if (elemLength == 0) {
continue;
}
/* Append to the result with space if needed */
................................................................................
* string append algorithm. When that fails it will report the error.
*/
TclNewObj(resPtr);
Tcl_AttemptSetObjLength(resPtr, bytesNeeded + objc - 1);
Tcl_SetObjLength(resPtr, 0);
for (i = 0; i < objc; i++) {
int trim;
element = TclGetStringFromObj(objv[i], &elemLength);
/* Trim away the leading whitespace */
trim = TclTrimLeft(element, elemLength, CONCAT_WS, CONCAT_WS_SIZE);
element += trim;
elemLength -= trim;
/*
* Trim away the trailing whitespace. Do not permit trimming
* to expose a final backslash character.
*/
trim = TclTrimRight(element, elemLength, CONCAT_WS, CONCAT_WS_SIZE);
trim -= trim && (element[elemLength - trim - 1] == '\\');
elemLength -= trim;
/* If we're left with empty element after trimming, do nothing */
if (elemLength == 0) {
continue;
}
/* Append to the result with space if needed */
|
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TclUtfToUniChar(buf, &ch);
return (char) ch;
}
/*
*----------------------------------------------------------------------
*
* UtfWellFormedEnd --
* Checks the end of utf string is malformed, if yes - wraps bytes
* to the given buffer (as well-formed NTS string). The buffer
* argument should be initialized by the caller and ready to use.
*
* Results:
* The bytes with well-formed end of the string.
*
* Side effects:
* Buffer (DString) may be allocated, so must be released.
*
*----------------------------------------------------------------------
*/
static inline const char*
UtfWellFormedEnd(
Tcl_DString *buffer, /* Buffer used to hold well-formed string. */
CONST char *bytes, /* Pointer to the beginning of the string. */
int length) /* Length of the string. */
{
CONST char *l = bytes + length;
CONST char *p = Tcl_UtfPrev(l, bytes);
if (Tcl_UtfCharComplete(p, l - p)) {
return bytes;
}
/*
* Malformed utf-8 end, be sure we've NTS to safe compare of end-character,
* avoid segfault by access violation out of range.
*/
Tcl_DStringAppend(buffer, bytes, length);
return Tcl_DStringValue(buffer);
}
/*
*----------------------------------------------------------------------
*
* TclTrimRight --
* Takes two counted strings in the Tcl encoding. Conceptually
* finds the sub string (offset) to trim from the right side of the
* first string all characters found in the second string.
*
* Results:
* The number of bytes to be removed from the end of the string.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static inline int
TrimRight(
const char *bytes, /* String to be trimmed... */
int numBytes, /* ...and its length in bytes */
const char *trim, /* String of trim characters... */
int numTrim) /* ...and its length in bytes */
{
const char *p = bytes + numBytes;
int pInc;
/* Outer loop: iterate over string to be trimmed */
do {
Tcl_UniChar ch1;
const char *q = trim;
int bytesLeft = numTrim;
p = Tcl_UtfPrev(p, bytes);
................................................................................
p += pInc;
break;
}
} while (p > bytes);
return numBytes - (p - bytes);
}
int
TclTrimRight(
const char *bytes, /* String to be trimmed... */
int numBytes, /* ...and its length in bytes */
const char *trim, /* String of trim characters... */
int numTrim) /* ...and its length in bytes */
{
int res;
Tcl_DString bytesBuf, trimBuf;
/* Empty strings -> nothing to do */
if ((numBytes == 0) || (numTrim == 0)) {
return 0;
}
Tcl_DStringInit(&bytesBuf);
Tcl_DStringInit(&trimBuf);
bytes = UtfWellFormedEnd(&bytesBuf, bytes, numBytes);
trim = UtfWellFormedEnd(&trimBuf, trim, numTrim);
res = TrimRight(bytes, numBytes, trim, numTrim);
if (res > numBytes) {
res = numBytes;
}
Tcl_DStringFree(&bytesBuf);
Tcl_DStringFree(&trimBuf);
return res;
}
/*
*----------------------------------------------------------------------
*
* TclTrimLeft --
* Takes two counted strings in the Tcl encoding. Conceptually
* finds the sub string (offset) to trim from the left side of the
* first string all characters found in the second string.
*
* Results:
* The number of bytes to be removed from the start of the string.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static inline int
TrimLeft(
const char *bytes, /* String to be trimmed... */
int numBytes, /* ...and its length in bytes */
const char *trim, /* String of trim characters... */
int numTrim) /* ...and its length in bytes */
{
const char *p = bytes;
/* Outer loop: iterate over string to be trimmed */
do {
Tcl_UniChar ch1;
int pInc = TclUtfToUniChar(p, &ch1);
const char *q = trim;
int bytesLeft = numTrim;
................................................................................
if (bytesLeft == 0) {
/* No match; trim task done; *p is first non-trimmed char */
break;
}
p += pInc;
numBytes -= pInc;
} while (numBytes > 0);
return p - bytes;
}
int
TclTrimLeft(
const char *bytes, /* String to be trimmed... */
int numBytes, /* ...and its length in bytes */
const char *trim, /* String of trim characters... */
int numTrim) /* ...and its length in bytes */
{
int res;
Tcl_DString bytesBuf, trimBuf;
/* Empty strings -> nothing to do */
if ((numBytes == 0) || (numTrim == 0)) {
return 0;
}
Tcl_DStringInit(&bytesBuf);
Tcl_DStringInit(&trimBuf);
bytes = UtfWellFormedEnd(&bytesBuf, bytes, numBytes);
trim = UtfWellFormedEnd(&trimBuf, trim, numTrim);
res = TrimLeft(bytes, numBytes, trim, numTrim);
if (res > numBytes) {
res = numBytes;
}
Tcl_DStringFree(&bytesBuf);
Tcl_DStringFree(&trimBuf);
return res;
}
/*
*----------------------------------------------------------------------
*
* TclTrim --
* Finds the sub string (offset) to trim from both sides of the
* first string all characters found in the second string.
*
* Results:
* The number of bytes to be removed from the start of the string
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
TclTrim(
const char *bytes, /* String to be trimmed... */
int numBytes, /* ...and its length in bytes */
const char *trim, /* String of trim characters... */
int numTrim, /* ...and its length in bytes */
int *trimRight) /* Offset from the end of the string. */
{
int trimLeft;
Tcl_DString bytesBuf, trimBuf;
/* Empty strings -> nothing to do */
if ((numBytes == 0) || (numTrim == 0)) {
return 0;
}
Tcl_DStringInit(&bytesBuf);
Tcl_DStringInit(&trimBuf);
bytes = UtfWellFormedEnd(&bytesBuf, bytes, numBytes);
trim = UtfWellFormedEnd(&trimBuf, trim, numTrim);
trimLeft = TrimLeft(bytes, numBytes, trim, numTrim);
if (trimLeft > numBytes) {
trimLeft = numBytes;
}
numBytes -= trimLeft;
*trimRight = 0;
if (numBytes) {
bytes += trimLeft;
*trimRight = TrimRight(bytes, numBytes, trim, numTrim);
if (*trimRight > numBytes) {
*trimRight = numBytes;
}
}
Tcl_DStringFree(&bytesBuf);
Tcl_DStringFree(&trimBuf);
return trimLeft;
}
/*
*----------------------------------------------------------------------
*
* Tcl_Concat --
*
* Concatenate a set of strings into a single large string.
................................................................................
*/
Tcl_Panic("Tcl_Concat: max size of Tcl value exceeded");
}
/* All element bytes + (argc - 1) spaces + 1 terminating NULL */
result = (char *) ckalloc((unsigned) (bytesNeeded + argc));
for (p = result, i = 0; i < argc; i++) {
int triml, trimr, elemLength;
const char *element;
element = argv[i];
elemLength = strlen(argv[i]);
/* Trim away the leading/trailing whitespace. */
triml = TclTrim(element, elemLength, CONCAT_WS, CONCAT_WS_SIZE, &trimr);
element += triml;
elemLength -= triml + trimr;
/* Do not permit trimming to expose a final backslash character. */
elemLength += trimr && (element[elemLength - 1] == '\\');
/* If we're left with empty element after trimming, do nothing */
if (elemLength == 0) {
continue;
}
/* Append to the result with space if needed */
................................................................................
* string append algorithm. When that fails it will report the error.
*/
TclNewObj(resPtr);
Tcl_AttemptSetObjLength(resPtr, bytesNeeded + objc - 1);
Tcl_SetObjLength(resPtr, 0);
for (i = 0; i < objc; i++) {
int triml, trimr;
element = TclGetStringFromObj(objv[i], &elemLength);
/* Trim away the leading/trailing whitespace. */
triml = TclTrim(element, elemLength, CONCAT_WS, CONCAT_WS_SIZE, &trimr);
element += triml;
elemLength -= triml + trimr;
/* Do not permit trimming to expose a final backslash character. */
elemLength += trimr && (element[elemLength - 1] == '\\');
/* If we're left with empty element after trimming, do nothing */
if (elemLength == 0) {
continue;
}
/* Append to the result with space if needed */
|