139 lines
3.3 KiB
C
139 lines
3.3 KiB
C
/*
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* $Id: awk04.c 195 2009-06-10 13:18:25Z hyunghwan.chung $
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*
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Copyright 2006-2009 Chung, Hyung-Hwan.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/****S* AWK/Calling Functions
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* DESCRIPTION
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* This program demonstrates how to use qse_awk_rtx_call().
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* It parses the program stored in the string src and calls the functions
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* stated in the array fnc. If no errors occur, it should print 24.
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* SOURCE
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*/
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#include <qse/awk/awk.h>
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#include <qse/awk/std.h>
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#include <qse/cmn/stdio.h>
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static const qse_char_t* src = QSE_T(
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"function pow(x,y) { return x ** y; }"
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);
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int main ()
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{
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qse_awk_t* awk = QSE_NULL;
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qse_awk_rtx_t* rtx = QSE_NULL;
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qse_awk_parsestd_in_t psin;
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qse_char_t* str;
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qse_size_t len;
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qse_awk_val_t* v;
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qse_awk_val_t* arg[2] = { QSE_NULL, QSE_NULL };
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int ret, i;
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/* create a main processor */
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awk = qse_awk_openstd (0);
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if (awk == QSE_NULL)
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{
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qse_fprintf (QSE_STDERR, QSE_T("error: cannot open awk\n"));
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ret = -1; goto oops;
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}
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/* don't allow BEGIN, END, pattern-action blocks */
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qse_awk_setoption (awk, qse_awk_getoption(awk) & ~QSE_AWK_PABLOCK);
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psin.type = QSE_AWK_PARSESTD_CP;
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psin.u.cp = src;
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ret = qse_awk_parsestd (awk, &psin, QSE_NULL);
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if (ret == -1)
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{
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qse_fprintf (QSE_STDERR, QSE_T("error: %s\n"),
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qse_awk_geterrmsg(awk));
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goto oops;
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}
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/* create a runtime context */
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rtx = qse_awk_rtx_openstd (
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awk,
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0,
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QSE_T("awk04"),
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QSE_NULL, /* stdin */
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QSE_NULL /* stdout */
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);
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if (rtx == QSE_NULL)
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{
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qse_fprintf (QSE_STDERR, QSE_T("error: %s\n"),
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qse_awk_geterrmsg(awk));
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ret = -1; goto oops;
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}
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/* invoke the pow function */
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arg[0] = qse_awk_rtx_makeintval (rtx, 50);
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if (arg[0] == QSE_NULL)
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{
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qse_fprintf (QSE_STDERR, QSE_T("error: %s\n"),
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qse_awk_rtx_geterrmsg(rtx));
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ret = -1; goto oops;
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}
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qse_awk_rtx_refupval (rtx, arg[0]);
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arg[1] = qse_awk_rtx_makeintval (rtx, 3);
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if (arg[1] == QSE_NULL)
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{
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qse_fprintf (QSE_STDERR, QSE_T("error: %s\n"),
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qse_awk_rtx_geterrmsg(rtx));
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ret = -1; goto oops;
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}
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qse_awk_rtx_refupval (rtx, arg[1]);
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v = qse_awk_rtx_call (rtx, QSE_T("pow"), arg, 2);
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if (v == QSE_NULL)
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{
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qse_fprintf (QSE_STDERR, QSE_T("error: %s\n"),
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qse_awk_rtx_geterrmsg(rtx));
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ret = -1; goto oops;
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}
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str = qse_awk_rtx_valtocpldup (rtx, v, &len);
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if (str == QSE_NULL)
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{
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qse_fprintf (QSE_STDERR, QSE_T("error: %s\n"),
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qse_awk_rtx_geterrmsg(rtx));
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ret = -1; goto oops;
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}
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qse_printf (QSE_T("[%.*s]\n"), (int)len, str);
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qse_awk_rtx_free (rtx, str);
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/* clear the return value */
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qse_awk_rtx_refdownval (rtx, v);
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oops:
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/* dereference all arguments */
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for (i = 0; i < QSE_COUNTOF(arg); i++)
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{
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if (arg[i] != QSE_NULL)
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qse_awk_rtx_refdownval (rtx, arg[i]);
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}
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/* destroy a runtime context */
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if (rtx != QSE_NULL) qse_awk_rtx_close (rtx);
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/* destroy the processor */
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if (awk != QSE_NULL) qse_awk_close (awk);
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return ret;
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}
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/******/
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