57 lines
1.7 KiB
C
57 lines
1.7 KiB
C
/* Implement twalk using twalk_r.
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Copyright (C) 2019-2022 Free Software Foundation, Inc.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <https://www.gnu.org/licenses/>.
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*/
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#include <search.h>
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struct twalk_with_twalk_r_closure
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{
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void (*action) (const void *, VISIT, int);
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int depth;
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};
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static void
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twalk_with_twalk_r_action (const void *nodep, VISIT which, void *closure0)
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{
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struct twalk_with_twalk_r_closure *closure = closure0;
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switch (which)
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{
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case leaf:
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closure->action (nodep, which, closure->depth);
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break;
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case preorder:
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closure->action (nodep, which, closure->depth);
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++closure->depth;
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break;
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case postorder:
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/* The preorder action incremented the depth. */
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closure->action (nodep, which, closure->depth - 1);
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break;
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case endorder:
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--closure->depth;
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closure->action (nodep, which, closure->depth);
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break;
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}
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}
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void
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twalk (const void *root, void (*action) (const void *, VISIT, int))
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{
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struct twalk_with_twalk_r_closure closure = { action, 0 };
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twalk_r (root, twalk_with_twalk_r_action, &closure);
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}
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