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/*
* from TclUtil.c --
*
* This file contains utility procedures that are used by many Sci
* commands.
*
* Copyright (c) 1987-1993 The Regents of the University of California.
* Copyright (c) 1994-1997 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* SCCS: @(#) SciUtil.c 1.161 97/08/12 17:07:18
*/
#include "dstrings.h"
/*
*----------------------------------------------------------------------
*
* Sci_DStringInit --
*
* Initializes a dynamic string, discarding any previous contents
* of the string (Sci_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
Sci_DStringInit (dsPtr)
Sci_DString *dsPtr; /* Pointer to structure for dynamic string. */
{
dsPtr->string = dsPtr->staticSpace;
dsPtr->length = 0;
dsPtr->spaceAvl = SCI_DSTRING_STATIC_SIZE;
dsPtr->staticSpace[0] = 0;
}
/*
*----------------------------------------------------------------------
*
* Sci_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 *
Sci_DStringAppend (dsPtr, string, length)
Sci_DString *dsPtr; /* Structure describing dynamic string. */
const 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;
const char *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 *) malloc ((unsigned) dsPtr->spaceAvl);
memcpy ((void *) newString, (void *) dsPtr->string,
(size_t) dsPtr->length);
if (dsPtr->string != dsPtr->staticSpace)
{
free (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;
}
/*
*----------------------------------------------------------------------
*
* Sci_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
Sci_DStringSetLength (dsPtr, length)
Sci_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 *) malloc ((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)
{
free (dsPtr->string);
}
dsPtr->string = newString;
}
dsPtr->length = length;
dsPtr->string[length] = 0;
}
/*
*----------------------------------------------------------------------
*
* Sci_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
Sci_DStringFree (dsPtr)
Sci_DString *dsPtr; /* Structure describing dynamic string. */
{
if (dsPtr->string != dsPtr->staticSpace)
{
free (dsPtr->string);
}
dsPtr->string = dsPtr->staticSpace;
dsPtr->length = 0;
dsPtr->spaceAvl = SCI_DSTRING_STATIC_SIZE;
dsPtr->staticSpace[0] = 0;
}
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