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/*
* cook - file construction tool
* Copyright (C) 1998 Peter Miller;
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
*
* MANIFEST: functions to accumulate strings
*/
#include <ac/string.h>
#include <mem.h>
#include <stracc.h>
#include <trace.h>
void
stracc_constructor(sap)
stracc *sap;
{
sap->sa_max = 0;
sap->sa_len = 0;
sap->sa_buf = 0;
sap->sa_inuse = 0;
}
stracc *
stracc_new()
{
stracc *sap;
sap = mem_alloc(sizeof(stracc));
stracc_constructor(sap);
return sap;
}
void
stracc_destructor(sap)
stracc *sap;
{
assert(!sap->sa_inuse);
if (sap->sa_buf)
mem_free(sap->sa_buf);
sap->sa_max = 0;
sap->sa_len = 0;
sap->sa_buf = 0;
sap->sa_inuse = 0;
}
/*
* NAME
* sa_open - start accumulating a string.
*
* SYNOPSIS
* void sa_open(stracc *);
*
* DESCRIPTION
* Sa_open begins accumulating a string for the lexical analyser.
* This allows virtually infinite length constructs within the
* lexical analyser.
*/
void
sa_open(sap)
stracc *sap;
{
trace(("sa_open()\n{\n"/*}*/));
assert(!sap->sa_inuse);
sap->sa_inuse = 1;
sap->sa_len = 0;
trace((/*{*/"}\n"));
}
/*
* NAME
* sa_char - add a character to the accumulating string
*
* SYNOPSIS
* void sa_char(stracc *, int c);
*
* DESCRIPTION
* Sa_char adds a character to the accumulating string.
*
* CAVEAT
* Sa_open must have been called previously.
*/
void
sa_char(sap, c)
stracc *sap;
int c;
{
trace(("sa_char(c = '%c')\n{\n"/*}*/, c));
assert(sap->sa_inuse);
if (sap->sa_len >= sap->sa_max)
{
sap->sa_max = sap->sa_max * 2 + 16;
sap->sa_buf = mem_change_size(sap->sa_buf, sap->sa_max);
}
sap->sa_buf[sap->sa_len++] = c;
trace((/*{*/"}\n"));
}
/*
* NAME
* sa_close - finish accumulating a string
*
* SYNOPSIS
* string_ty *sa_close(stracc *);
*
* DESCRIPTION
* Sa_close finished accumulating a string and
* returns a pointer to the string in dynamic memory.
*
* CAVEAT
* Sa_open must have been called previously.
*
* The value returned by this function is allocated in dynamic memory.
* It is the responsibility of the caller to ensure that it is freed when
* finished with, by a call to str_free().
*/
string_ty *
sa_close(sap)
stracc *sap;
{
string_ty *val;
trace(("sa_close()\n{\n"/*}*/));
assert(sap->sa_inuse);
val = str_n_from_c(sap->sa_buf, sap->sa_len);
sap->sa_inuse = 0;
trace(("return %08lX;\n", val));
trace((/*{*/"}\n"));
return val;
}
/*
* NAME
* sa_mark - mark place when accumulating a string
*
* SYNOPSIS
* size_t sa_mark(stracc *);
*
* DESACRIPTION
* Sa_mark returns an indicator as to where the string being accumulated
* is up to.
*
* CAVEAT
* Sa_open must have been called previously.
* Do not use the returned value for anything other than passing to
* sa_goto as an argument.
*/
size_t
sa_mark(sap)
stracc *sap;
{
assert(sap->sa_inuse);
return (sap->sa_len);
}
/*
* NAME
* sa_goto - shorten the accumulated string
*
* SYNOPSIS
* void sa_goto(stracc *, size_t mark);
*
* DESACRIPTION
* Sa_goto shotens the accumulating string to a point
* previously determined by sa_mark.
*
* CAVEAT
* Sa_open must have been called previously.
* The mark argument must have previously been returned by sa_mark,
* and sa_close not called in the interim.
*/
void
sa_goto(sap, n)
stracc *sap;
size_t n;
{
assert(sap->sa_inuse);
assert(n <= sap->sa_len);
sap->sa_len = n;
}
void
sa_chars(sap, cp, len)
stracc *sap;
const char *cp;
size_t len;
{
trace(("sa_chars()\n{\n"/*}*/));
assert(sap->sa_inuse);
while (sap->sa_len + len > sap->sa_max)
{
sap->sa_max = sap->sa_max * 2 + 16;
sap->sa_buf = mem_change_size(sap->sa_buf, sap->sa_max);
}
memcpy(sap->sa_buf + sap->sa_len, cp, len);
sap->sa_len += len;
trace((/*{*/"}\n"));
}
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