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104 lines
2.1 KiB
C
104 lines
2.1 KiB
C
/*++
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/* NAME
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/* tok_pool 3
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/* SUMMARY
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/* maintain pool of unused token structures
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/* PACKAGE
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/* unproto
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/* SYNOPSIS
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/* #include "token.h"
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/*
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/* struct token *tok_alloc()
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/*
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/* void tok_free(t)
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/* struct token *t;
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/* DESCRIPTION
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/* tok_alloc() and tok_free() maintain a pool of unused token
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/* structures.
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/*
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/* tok_alloc() takes the first free token structure from the pool
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/* or allocates a new one if the pool is empty.
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/*
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/* tok_free() adds a (possibly composite) token structure to the pool.
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/* BUGS
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/* The pool never shrinks.
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/* AUTHOR(S)
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/* Wietse Venema
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/* Eindhoven University of Technology
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/* Department of Mathematics and Computer Science
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/* Den Dolech 2, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
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/* LAST MODIFICATION
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/* 92/01/15 21:53:04
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/* VERSION/RELEASE
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/* 1.2
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/*--*/
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static char pool_sccsid[] = "@(#) tok_pool.c 1.2 92/01/15 21:53:04";
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/* C library */
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extern char *malloc();
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/* Application-specific stuff */
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#include "token.h"
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#include "vstring.h"
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#include "error.h"
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#define TOKLEN 5 /* initial string buffer length */
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struct token *tok_pool = 0; /* free token pool */
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/* tok_alloc - allocate token structure from pool or heap */
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struct token *tok_alloc()
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{
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register struct token *t;
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if (tok_pool) { /* re-use an old one */
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t = tok_pool;
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tok_pool = t->next;
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} else { /* create a new one */
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if ((t = (struct token *) malloc(sizeof(struct token))) == 0
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|| (t->vstr = vs_alloc(TOKLEN)) == 0)
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fatal("out of memory");
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}
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t->next = t->head = t->tail = 0;
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#ifdef DEBUG
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strcpy(t->vstr->str, "BUSY");
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#endif
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return (t);
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}
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/* tok_free - return (possibly composite) token to pool of free tokens */
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void tok_free(t)
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register struct token *t;
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{
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#ifdef DEBUG
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/* Check if we are freeing free token */
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register struct token *p;
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for (p = tok_pool; p; p = p->next)
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if (p == t)
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fatal("freeing free token");
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#endif
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/* Free neighbours and subordinates first */
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if (t->next)
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tok_free(t->next);
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if (t->head)
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tok_free(t->head);
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/* Free self */
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t->next = tok_pool;
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t->head = t->tail = 0;
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tok_pool = t;
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#ifdef DEBUG
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strcpy(t->vstr->str, "FREE");
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#endif
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}
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