811 lines
19 KiB
C
811 lines
19 KiB
C
/*-
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* Copyright (c) 1992 Diomidis Spinellis.
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Diomidis Spinellis of Imperial College, University of London.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)compile.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <regex.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "defs.h"
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#include "extern.h"
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#define LHSZ 128
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#define LHMASK (LHSZ - 1)
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static struct labhash {
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struct labhash *lh_next;
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u_int lh_hash;
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struct s_command *lh_cmd;
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int lh_ref;
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} *labels[LHSZ];
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static char *compile_addr __P((char *, struct s_addr *));
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static char *compile_ccl __P((char **, char *));
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static char *compile_delimited __P((char *, char *));
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static char *compile_flags __P((char *, struct s_subst *));
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static char *compile_re __P((char *, regex_t **));
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static char *compile_subst __P((char *, struct s_subst *));
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static char *compile_text __P((void));
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static char *compile_tr __P((char *, char **));
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static struct s_command
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**compile_stream __P((struct s_command **));
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static char *duptoeol __P((char *, char *));
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static void enterlabel __P((struct s_command *));
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static struct s_command
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*findlabel __P((char *));
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static void fixuplabel __P((struct s_command *, struct s_command *));
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static void uselabel __P((void));
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/*
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* Command specification. This is used to drive the command parser.
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*/
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struct s_format {
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char code; /* Command code */
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int naddr; /* Number of address args */
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enum e_args args; /* Argument type */
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};
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static struct s_format cmd_fmts[] = {
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{'{', 2, GROUP},
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{'}', 0, ENDGROUP},
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{'a', 1, TEXT},
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{'b', 2, BRANCH},
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{'c', 2, TEXT},
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{'d', 2, EMPTY},
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{'D', 2, EMPTY},
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{'g', 2, EMPTY},
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{'G', 2, EMPTY},
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{'h', 2, EMPTY},
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{'H', 2, EMPTY},
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{'i', 1, TEXT},
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{'l', 2, EMPTY},
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{'n', 2, EMPTY},
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{'N', 2, EMPTY},
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{'p', 2, EMPTY},
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{'P', 2, EMPTY},
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{'q', 1, EMPTY},
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{'r', 1, RFILE},
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{'s', 2, SUBST},
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{'t', 2, BRANCH},
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{'w', 2, WFILE},
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{'x', 2, EMPTY},
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{'y', 2, TR},
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{'!', 2, NONSEL},
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{':', 0, LABEL},
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{'#', 0, COMMENT},
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{'=', 1, EMPTY},
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{'\0', 0, COMMENT},
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};
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/* The compiled program. */
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struct s_command *prog;
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/*
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* Compile the program into prog.
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* Initialise appends.
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*/
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void
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compile()
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{
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*compile_stream(&prog) = NULL;
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fixuplabel(prog, NULL);
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uselabel();
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appends = xmalloc(sizeof(struct s_appends) * appendnum);
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match = xmalloc((maxnsub + 1) * sizeof(regmatch_t));
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}
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#define EATSPACE() do { \
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if (p) \
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while (*p && isascii(*p) && isspace(*p)) \
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p++; \
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} while (0)
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static struct s_command **
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compile_stream(link)
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struct s_command **link;
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{
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register char *p;
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static char lbuf[_POSIX2_LINE_MAX + 1]; /* To save stack */
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struct s_command *cmd, *cmd2, *stack;
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struct s_format *fp;
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int naddr; /* Number of addresses */
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stack = 0;
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for (;;) {
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if ((p = cu_fgets(lbuf, sizeof(lbuf))) == NULL) {
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if (stack != 0)
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err(COMPILE, "unexpected EOF (pending }'s)");
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return (link);
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}
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semicolon: EATSPACE();
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if (p && (*p == '#' || *p == '\0'))
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continue;
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*link = cmd = xmalloc(sizeof(struct s_command));
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link = &cmd->next;
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cmd->nonsel = cmd->inrange = 0;
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/* First parse the addresses */
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naddr = 0;
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/* Valid characters to start an address */
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#define addrchar(c) (strchr("0123456789/\\$", (c)))
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if (addrchar(*p)) {
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naddr++;
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cmd->a1 = xmalloc(sizeof(struct s_addr));
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p = compile_addr(p, cmd->a1);
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EATSPACE(); /* EXTENSION */
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if (*p == ',') {
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p++;
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EATSPACE(); /* EXTENSION */
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naddr++;
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cmd->a2 = xmalloc(sizeof(struct s_addr));
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p = compile_addr(p, cmd->a2);
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EATSPACE();
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} else
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cmd->a2 = 0;
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} else
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cmd->a1 = cmd->a2 = 0;
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nonsel: /* Now parse the command */
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if (!*p)
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err(COMPILE, "command expected");
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cmd->code = *p;
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for (fp = cmd_fmts; fp->code; fp++)
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if (fp->code == *p)
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break;
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if (!fp->code)
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err(COMPILE, "invalid command code %c", *p);
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if (naddr > fp->naddr)
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err(COMPILE,
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"command %c expects up to %d address(es), found %d", *p, fp->naddr, naddr);
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switch (fp->args) {
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case NONSEL: /* ! */
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p++;
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EATSPACE();
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cmd->nonsel = ! cmd->nonsel;
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goto nonsel;
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case GROUP: /* { */
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p++;
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EATSPACE();
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cmd->next = stack;
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stack = cmd;
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link = &cmd->u.c;
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if (*p)
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goto semicolon;
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break;
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case ENDGROUP:
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/*
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* Short-circuit command processing, since end of
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* group is really just a noop.
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*/
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cmd->nonsel = 1;
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if (stack == 0)
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err(COMPILE, "unexpected }");
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cmd2 = stack;
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stack = cmd2->next;
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cmd2->next = cmd;
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/*FALLTHROUGH*/
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case EMPTY: /* d D g G h H l n N p P q x = \0 */
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p++;
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EATSPACE();
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if (*p == ';') {
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p++;
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link = &cmd->next;
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goto semicolon;
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}
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if (*p)
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err(COMPILE,
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"extra characters at the end of %c command", cmd->code);
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break;
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case TEXT: /* a c i */
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p++;
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EATSPACE();
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if (*p != '\\')
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err(COMPILE,
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"command %c expects \\ followed by text", cmd->code);
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p++;
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EATSPACE();
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if (*p)
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err(COMPILE,
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"extra characters after \\ at the end of %c command", cmd->code);
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cmd->t = compile_text();
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break;
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case COMMENT: /* \0 # */
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break;
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case WFILE: /* w */
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p++;
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EATSPACE();
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if (*p == '\0')
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err(COMPILE, "filename expected");
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cmd->t = duptoeol(p, "w command");
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if (aflag)
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cmd->u.fd = -1;
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else if ((cmd->u.fd = open(p,
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O_WRONLY|O_APPEND|O_CREAT|O_TRUNC,
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DEFFILEMODE)) == -1)
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err(FATAL, "%s: %s\n", p, strerror(errno));
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break;
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case RFILE: /* r */
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p++;
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EATSPACE();
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if (*p == '\0')
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err(COMPILE, "filename expected");
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else
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cmd->t = duptoeol(p, "read command");
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break;
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case BRANCH: /* b t */
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p++;
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EATSPACE();
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if (*p == '\0')
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cmd->t = NULL;
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else
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cmd->t = duptoeol(p, "branch");
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break;
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case LABEL: /* : */
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p++;
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EATSPACE();
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cmd->t = duptoeol(p, "label");
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if (strlen(p) == 0)
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err(COMPILE, "empty label");
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enterlabel(cmd);
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break;
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case SUBST: /* s */
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p++;
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if (*p == '\0' || *p == '\\')
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err(COMPILE,
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"substitute pattern can not be delimited by newline or backslash");
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cmd->u.s = xmalloc(sizeof(struct s_subst));
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p = compile_re(p, &cmd->u.s->re);
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if (p == NULL)
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err(COMPILE, "unterminated substitute pattern");
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--p;
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p = compile_subst(p, cmd->u.s);
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p = compile_flags(p, cmd->u.s);
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EATSPACE();
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if (*p == ';') {
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p++;
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link = &cmd->next;
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goto semicolon;
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}
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break;
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case TR: /* y */
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p++;
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p = compile_tr(p, (char **)&cmd->u.y);
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EATSPACE();
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if (*p == ';') {
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p++;
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link = &cmd->next;
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goto semicolon;
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}
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if (*p)
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err(COMPILE,
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"extra text at the end of a transform command");
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break;
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}
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}
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}
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/*
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* Get a delimited string. P points to the delimeter of the string; d points
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* to a buffer area. Newline and delimiter escapes are processed; other
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* escapes are ignored.
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*
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* Returns a pointer to the first character after the final delimiter or NULL
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* in the case of a non-terminated string. The character array d is filled
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* with the processed string.
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*/
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static char *
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compile_delimited(p, d)
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char *p, *d;
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{
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char c;
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c = *p++;
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if (c == '\0')
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return (NULL);
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else if (c == '\\')
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err(COMPILE, "\\ can not be used as a string delimiter");
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else if (c == '\n')
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err(COMPILE, "newline can not be used as a string delimiter");
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while (*p) {
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if (*p == '[') {
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if ((d = compile_ccl(&p, d)) == NULL)
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err(COMPILE, "unbalanced brackets ([])");
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continue;
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} else if (*p == '\\' && p[1] == '[') {
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*d++ = *p++;
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} else if (*p == '\\' && p[1] == c)
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p++;
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else if (*p == '\\' && p[1] == 'n') {
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*d++ = '\n';
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p += 2;
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continue;
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} else if (*p == '\\' && p[1] == '\\')
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*d++ = *p++;
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else if (*p == c) {
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*d = '\0';
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return (p + 1);
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}
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*d++ = *p++;
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}
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return (NULL);
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}
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/* compile_ccl: expand a POSIX character class */
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static char *
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compile_ccl(sp, t)
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char **sp;
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char *t;
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{
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int c, d;
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char *s = *sp;
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*t++ = *s++;
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if (*s == '^')
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*t++ = *s++;
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if (*s == ']')
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*t++ = *s++;
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for (; *s && (*t = *s) != ']'; s++, t++)
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if (*s == '[' && ((d = *(s+1)) == '.' || d == ':' || d == '=')) {
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*++t = *++s, t++, s++;
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for (c = *s; (*t = *s) != ']' || c != d; s++, t++)
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if ((c = *s) == '\0')
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return NULL;
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} else if (*s == '\\' && s[1] == 'n')
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*t = '\n', s++;
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return (*s == ']') ? *sp = ++s, ++t : NULL;
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}
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/*
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* Get a regular expression. P points to the delimiter of the regular
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* expression; repp points to the address of a regexp pointer. Newline
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* and delimiter escapes are processed; other escapes are ignored.
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* Returns a pointer to the first character after the final delimiter
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* or NULL in the case of a non terminated regular expression. The regexp
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* pointer is set to the compiled regular expression.
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* Cflags are passed to regcomp.
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*/
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static char *
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compile_re(p, repp)
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char *p;
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regex_t **repp;
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{
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int eval;
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char re[_POSIX2_LINE_MAX + 1];
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p = compile_delimited(p, re);
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if (p && strlen(re) == 0) {
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*repp = NULL;
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return (p);
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}
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*repp = xmalloc(sizeof(regex_t));
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if (p && (eval = regcomp(*repp, re, 0)) != 0)
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err(COMPILE, "RE error: %s", strregerror(eval, *repp));
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if (maxnsub < (*repp)->re_nsub)
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maxnsub = (*repp)->re_nsub;
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return (p);
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}
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|
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/*
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* Compile the substitution string of a regular expression and set res to
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* point to a saved copy of it. Nsub is the number of parenthesized regular
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* expressions.
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*/
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static char *
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compile_subst(p, s)
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char *p;
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struct s_subst *s;
|
|
{
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static char lbuf[_POSIX2_LINE_MAX + 1];
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int asize, ref, size;
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char c, *text, *op, *sp;
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|
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c = *p++; /* Terminator character */
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if (c == '\0')
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return (NULL);
|
|
|
|
s->maxbref = 0;
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|
s->linenum = linenum;
|
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asize = 2 * _POSIX2_LINE_MAX + 1;
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text = xmalloc(asize);
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size = 0;
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do {
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op = sp = text + size;
|
|
for (; *p; p++) {
|
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if (*p == '\\') {
|
|
p++;
|
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if (strchr("123456789", *p) != NULL) {
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|
*sp++ = '\\';
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ref = *p - '0';
|
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if (s->re != NULL &&
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ref > s->re->re_nsub)
|
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err(COMPILE,
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|
"\\%c not defined in the RE", *p);
|
|
if (s->maxbref < ref)
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|
s->maxbref = ref;
|
|
} else if (*p == '&' || *p == '\\')
|
|
*sp++ = '\\';
|
|
} else if (*p == c) {
|
|
p++;
|
|
*sp++ = '\0';
|
|
size += sp - op;
|
|
s->new = xrealloc(text, size);
|
|
return (p);
|
|
} else if (*p == '\n') {
|
|
err(COMPILE,
|
|
"unescaped newline inside substitute pattern");
|
|
/* NOTREACHED */
|
|
}
|
|
*sp++ = *p;
|
|
}
|
|
size += sp - op;
|
|
if (asize - size < _POSIX2_LINE_MAX + 1) {
|
|
asize *= 2;
|
|
text = xmalloc(asize);
|
|
}
|
|
} while (cu_fgets(p = lbuf, sizeof(lbuf)));
|
|
err(COMPILE, "unterminated substitute in regular expression");
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* Compile the flags of the s command
|
|
*/
|
|
static char *
|
|
compile_flags(p, s)
|
|
char *p;
|
|
struct s_subst *s;
|
|
{
|
|
int gn; /* True if we have seen g or n */
|
|
char wfile[_POSIX2_LINE_MAX + 1], *q;
|
|
|
|
s->n = 1; /* Default */
|
|
s->p = 0;
|
|
s->wfile = NULL;
|
|
s->wfd = -1;
|
|
for (gn = 0;;) {
|
|
EATSPACE(); /* EXTENSION */
|
|
switch (*p) {
|
|
case 'g':
|
|
if (gn)
|
|
err(COMPILE,
|
|
"more than one number or 'g' in substitute flags");
|
|
gn = 1;
|
|
s->n = 0;
|
|
break;
|
|
case '\0':
|
|
case '\n':
|
|
case ';':
|
|
return (p);
|
|
case 'p':
|
|
s->p = 1;
|
|
break;
|
|
case '1': case '2': case '3':
|
|
case '4': case '5': case '6':
|
|
case '7': case '8': case '9':
|
|
if (gn)
|
|
err(COMPILE,
|
|
"more than one number or 'g' in substitute flags");
|
|
gn = 1;
|
|
/* XXX Check for overflow */
|
|
s->n = (int)strtol(p, &p, 10);
|
|
break;
|
|
case 'w':
|
|
p++;
|
|
#ifdef HISTORIC_PRACTICE
|
|
if (*p != ' ') {
|
|
err(WARNING, "space missing before w wfile");
|
|
return (p);
|
|
}
|
|
#endif
|
|
EATSPACE();
|
|
q = wfile;
|
|
while (*p) {
|
|
if (*p == '\n')
|
|
break;
|
|
*q++ = *p++;
|
|
}
|
|
*q = '\0';
|
|
if (q == wfile)
|
|
err(COMPILE, "no wfile specified");
|
|
s->wfile = strdup(wfile);
|
|
if (!aflag && (s->wfd = open(wfile,
|
|
O_WRONLY|O_APPEND|O_CREAT|O_TRUNC,
|
|
DEFFILEMODE)) == -1)
|
|
err(FATAL, "%s: %s\n", wfile, strerror(errno));
|
|
return (p);
|
|
default:
|
|
err(COMPILE,
|
|
"bad flag in substitute command: '%c'", *p);
|
|
break;
|
|
}
|
|
p++;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Compile a translation set of strings into a lookup table.
|
|
*/
|
|
static char *
|
|
compile_tr(p, transtab)
|
|
char *p;
|
|
char **transtab;
|
|
{
|
|
int i;
|
|
char *lt, *op, *np;
|
|
char old[_POSIX2_LINE_MAX + 1];
|
|
char new[_POSIX2_LINE_MAX + 1];
|
|
|
|
if (*p == '\0' || *p == '\\')
|
|
err(COMPILE,
|
|
"transform pattern can not be delimited by newline or backslash");
|
|
p = compile_delimited(p, old);
|
|
if (p == NULL) {
|
|
err(COMPILE, "unterminated transform source string");
|
|
return (NULL);
|
|
}
|
|
p = compile_delimited(--p, new);
|
|
if (p == NULL) {
|
|
err(COMPILE, "unterminated transform target string");
|
|
return (NULL);
|
|
}
|
|
EATSPACE();
|
|
if (strlen(new) != strlen(old)) {
|
|
err(COMPILE, "transform strings are not the same length");
|
|
return (NULL);
|
|
}
|
|
/* We assume characters are 8 bits */
|
|
lt = xmalloc(UCHAR_MAX);
|
|
for (i = 0; i <= UCHAR_MAX; i++)
|
|
lt[i] = (char)i;
|
|
for (op = old, np = new; *op; op++, np++)
|
|
lt[(u_char)*op] = *np;
|
|
*transtab = lt;
|
|
return (p);
|
|
}
|
|
|
|
/*
|
|
* Compile the text following an a or i command.
|
|
*/
|
|
static char *
|
|
compile_text()
|
|
{
|
|
int asize, size;
|
|
char *text, *p, *op, *s;
|
|
char lbuf[_POSIX2_LINE_MAX + 1];
|
|
|
|
asize = 2 * _POSIX2_LINE_MAX + 1;
|
|
text = xmalloc(asize);
|
|
size = 0;
|
|
while (cu_fgets(lbuf, sizeof(lbuf))) {
|
|
op = s = text + size;
|
|
p = lbuf;
|
|
EATSPACE();
|
|
for (; *p; p++) {
|
|
if (*p == '\\')
|
|
p++;
|
|
*s++ = *p;
|
|
}
|
|
size += s - op;
|
|
if (p[-2] != '\\') {
|
|
*s = '\0';
|
|
break;
|
|
}
|
|
if (asize - size < _POSIX2_LINE_MAX + 1) {
|
|
asize *= 2;
|
|
text = xmalloc(asize);
|
|
}
|
|
}
|
|
return (xrealloc(text, size + 1));
|
|
}
|
|
|
|
/*
|
|
* Get an address and return a pointer to the first character after
|
|
* it. Fill the structure pointed to according to the address.
|
|
*/
|
|
static char *
|
|
compile_addr(p, a)
|
|
char *p;
|
|
struct s_addr *a;
|
|
{
|
|
char *end;
|
|
|
|
switch (*p) {
|
|
case '\\': /* Context address */
|
|
++p;
|
|
/* FALLTHROUGH */
|
|
case '/': /* Context address */
|
|
p = compile_re(p, &a->u.r);
|
|
if (p == NULL)
|
|
err(COMPILE, "unterminated regular expression");
|
|
a->type = AT_RE;
|
|
return (p);
|
|
|
|
case '$': /* Last line */
|
|
a->type = AT_LAST;
|
|
return (p + 1);
|
|
/* Line number */
|
|
case '0': case '1': case '2': case '3': case '4':
|
|
case '5': case '6': case '7': case '8': case '9':
|
|
a->type = AT_LINE;
|
|
a->u.l = strtol(p, &end, 10);
|
|
return (end);
|
|
default:
|
|
err(COMPILE, "expected context address");
|
|
return (NULL);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* duptoeol --
|
|
* Return a copy of all the characters up to \n or \0.
|
|
*/
|
|
static char *
|
|
duptoeol(s, ctype)
|
|
register char *s;
|
|
char *ctype;
|
|
{
|
|
size_t len;
|
|
int ws;
|
|
char *start;
|
|
|
|
ws = 0;
|
|
for (start = s; *s != '\0' && *s != '\n'; ++s)
|
|
ws = isspace(*s);
|
|
*s = '\0';
|
|
if (ws)
|
|
err(WARNING, "whitespace after %s", ctype);
|
|
len = s - start + 1;
|
|
return (memmove(xmalloc(len), start, len));
|
|
}
|
|
|
|
/*
|
|
* Convert goto label names to addresses, and count a and r commands, in
|
|
* the given subset of the script. Free the memory used by labels in b
|
|
* and t commands (but not by :).
|
|
*
|
|
* TODO: Remove } nodes
|
|
*/
|
|
static void
|
|
fixuplabel(cp, end)
|
|
struct s_command *cp, *end;
|
|
{
|
|
|
|
for (; cp != end; cp = cp->next)
|
|
switch (cp->code) {
|
|
case 'a':
|
|
case 'r':
|
|
appendnum++;
|
|
break;
|
|
case 'b':
|
|
case 't':
|
|
/* Resolve branch target. */
|
|
if (cp->t == NULL) {
|
|
cp->u.c = NULL;
|
|
break;
|
|
}
|
|
if ((cp->u.c = findlabel(cp->t)) == NULL)
|
|
err(COMPILE2, "undefined label '%s'", cp->t);
|
|
free(cp->t);
|
|
break;
|
|
case '{':
|
|
/* Do interior commands. */
|
|
fixuplabel(cp->u.c, cp->next);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Associate the given command label for later lookup.
|
|
*/
|
|
static void
|
|
enterlabel(cp)
|
|
struct s_command *cp;
|
|
{
|
|
register struct labhash **lhp, *lh;
|
|
register u_char *p;
|
|
register u_int h, c;
|
|
|
|
for (h = 0, p = (u_char *)cp->t; (c = *p) != 0; p++)
|
|
h = (h << 5) + h + c;
|
|
lhp = &labels[h & LHMASK];
|
|
for (lh = *lhp; lh != NULL; lh = lh->lh_next)
|
|
if (lh->lh_hash == h && strcmp(cp->t, lh->lh_cmd->t) == 0)
|
|
err(COMPILE2, "duplicate label '%s'", cp->t);
|
|
lh = xmalloc(sizeof *lh);
|
|
lh->lh_next = *lhp;
|
|
lh->lh_hash = h;
|
|
lh->lh_cmd = cp;
|
|
lh->lh_ref = 0;
|
|
*lhp = lh;
|
|
}
|
|
|
|
/*
|
|
* Find the label contained in the command l in the command linked
|
|
* list cp. L is excluded from the search. Return NULL if not found.
|
|
*/
|
|
static struct s_command *
|
|
findlabel(name)
|
|
char *name;
|
|
{
|
|
register struct labhash *lh;
|
|
register u_char *p;
|
|
register u_int h, c;
|
|
|
|
for (h = 0, p = (u_char *)name; (c = *p) != 0; p++)
|
|
h = (h << 5) + h + c;
|
|
for (lh = labels[h & LHMASK]; lh != NULL; lh = lh->lh_next) {
|
|
if (lh->lh_hash == h && strcmp(name, lh->lh_cmd->t) == 0) {
|
|
lh->lh_ref = 1;
|
|
return (lh->lh_cmd);
|
|
}
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* Warn about any unused labels. As a side effect, release the label hash
|
|
* table space.
|
|
*/
|
|
static void
|
|
uselabel()
|
|
{
|
|
register struct labhash *lh, *next;
|
|
register int i;
|
|
|
|
for (i = 0; i < LHSZ; i++) {
|
|
for (lh = labels[i]; lh != NULL; lh = next) {
|
|
next = lh->lh_next;
|
|
if (!lh->lh_ref)
|
|
err(WARNING, "unused label '%s'",
|
|
lh->lh_cmd->t);
|
|
free(lh);
|
|
}
|
|
}
|
|
}
|