43daed4774
The fix is only partial and causes an asymmetry which breaks a test in multi_test.sh. We should consider both parts of the issue found in OpenBSD[1], but for now just revert the change. [1] http://undeadly.org/cgi?action=article;sid=20180728110010 Reported by: asomers
955 lines
22 KiB
C
955 lines
22 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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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. 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#ifndef lint
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static const char sccsid[] = "@(#)compile.c 8.1 (Berkeley) 6/6/93";
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#endif
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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 <err.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 <wchar.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(char *, struct s_addr *);
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static char *compile_ccl(char **, char *);
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static char *compile_delimited(char *, char *, int);
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static char *compile_flags(char *, struct s_subst *);
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static regex_t *compile_re(char *, int);
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static char *compile_subst(char *, struct s_subst *);
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static char *compile_text(void);
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static char *compile_tr(char *, struct s_tr **);
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static struct s_command
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**compile_stream(struct s_command **);
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static char *duptoeol(char *, const char *);
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static void enterlabel(struct s_command *);
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static struct s_command
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*findlabel(char *);
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static void fixuplabel(struct s_command *, struct s_command *);
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static void uselabel(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(void)
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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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if (appendnum == 0)
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appends = NULL;
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else if ((appends = malloc(sizeof(struct s_appends) * appendnum)) ==
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NULL)
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err(1, "malloc");
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if ((match = malloc((maxnsub + 1) * sizeof(regmatch_t))) == NULL)
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err(1, "malloc");
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}
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#define EATSPACE() do { \
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if (p) \
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while (*p && isspace((unsigned char)*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(struct s_command **link)
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{
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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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char re[_POSIX2_LINE_MAX + 1];
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int naddr; /* Number of addresses */
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stack = NULL;
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for (;;) {
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if ((p = cu_fgets(lbuf, sizeof(lbuf), NULL)) == NULL) {
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if (stack != NULL)
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errx(1, "%lu: %s: unexpected EOF (pending }'s)",
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linenum, fname);
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return (link);
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}
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semicolon: EATSPACE();
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if (p) {
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if (*p == '#' || *p == '\0')
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continue;
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else if (*p == ';') {
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p++;
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goto semicolon;
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}
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}
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if ((*link = cmd = malloc(sizeof(struct s_command))) == NULL)
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err(1, "malloc");
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link = &cmd->next;
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cmd->startline = cmd->nonsel = 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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if ((cmd->a1 = malloc(sizeof(struct s_addr))) == NULL)
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err(1, "malloc");
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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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if ((cmd->a2 = malloc(sizeof(struct s_addr)))
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== NULL)
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err(1, "malloc");
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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 = NULL;
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} else
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cmd->a1 = cmd->a2 = NULL;
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nonsel: /* Now parse the command */
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if (!*p)
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errx(1, "%lu: %s: command expected", linenum, fname);
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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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errx(1, "%lu: %s: invalid command code %c", linenum, fname, *p);
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if (naddr > fp->naddr)
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errx(1,
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"%lu: %s: command %c expects up to %d address(es), found %d",
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linenum, fname, *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 = 1;
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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 == NULL)
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errx(1, "%lu: %s: unexpected }", linenum, fname);
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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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errx(1, "%lu: %s: extra characters at the end of %c command",
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linenum, fname, 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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errx(1,
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"%lu: %s: command %c expects \\ followed by text", linenum, fname, cmd->code);
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p++;
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EATSPACE();
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if (*p)
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errx(1,
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"%lu: %s: extra characters after \\ at the end of %c command",
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linenum, fname, 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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errx(1, "%lu: %s: filename expected", linenum, fname);
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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(1, "%s", p);
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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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errx(1, "%lu: %s: filename expected", linenum, fname);
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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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errx(1, "%lu: %s: empty label", linenum, fname);
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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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errx(1,
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"%lu: %s: substitute pattern can not be delimited by newline or backslash",
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linenum, fname);
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if ((cmd->u.s = calloc(1, sizeof(struct s_subst))) == NULL)
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err(1, "malloc");
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p = compile_delimited(p, re, 0);
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if (p == NULL)
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errx(1,
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"%lu: %s: unterminated substitute pattern", linenum, fname);
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/* Compile RE with no case sensitivity temporarily */
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if (*re == '\0')
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cmd->u.s->re = NULL;
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else
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cmd->u.s->re = compile_re(re, 0);
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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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/* Recompile RE with case sensitivity from "I" flag if any */
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if (*re == '\0')
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cmd->u.s->re = NULL;
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else
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cmd->u.s->re = compile_re(re, cmd->u.s->icase);
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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, &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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errx(1,
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"%lu: %s: extra text at the end of a transform command", linenum, fname);
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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 delimiter 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(char *p, char *d, int is_tr)
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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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errx(1, "%lu: %s: \\ can not be used as a string delimiter",
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linenum, fname);
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else if (c == '\n')
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errx(1, "%lu: %s: newline can not be used as a string delimiter",
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linenum, fname);
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while (*p) {
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if (*p == '[' && *p != c) {
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if ((d = compile_ccl(&p, d)) == NULL)
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errx(1, "%lu: %s: unbalanced brackets ([])", linenum, fname);
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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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if (is_tr)
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p++;
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else
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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(char **sp, 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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}
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return (*s == ']') ? *sp = ++s, ++t : NULL;
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}
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/*
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* Compiles the regular expression in RE and returns a pointer to the compiled
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* regular expression.
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* Cflags are passed to regcomp.
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*/
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static regex_t *
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compile_re(char *re, int case_insensitive)
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{
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regex_t *rep;
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int eval, flags;
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flags = rflags;
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if (case_insensitive)
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flags |= REG_ICASE;
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if ((rep = malloc(sizeof(regex_t))) == NULL)
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err(1, "malloc");
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if ((eval = regcomp(rep, re, flags)) != 0)
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errx(1, "%lu: %s: RE error: %s",
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linenum, fname, strregerror(eval, rep));
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if (maxnsub < rep->re_nsub)
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maxnsub = rep->re_nsub;
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return (rep);
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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(char *p, struct s_subst *s)
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{
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static char lbuf[_POSIX2_LINE_MAX + 1];
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int asize, size;
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u_char ref;
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char c, *text, *op, *sp;
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int more = 1, sawesc = 0;
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c = *p++; /* Terminator character */
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if (c == '\0')
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return (NULL);
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s->maxbref = 0;
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s->linenum = linenum;
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asize = 2 * _POSIX2_LINE_MAX + 1;
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if ((text = malloc(asize)) == NULL)
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err(1, "malloc");
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size = 0;
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do {
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op = sp = text + size;
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for (; *p; p++) {
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if (*p == '\\' || sawesc) {
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/*
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* If this is a continuation from the last
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* buffer, we won't have a character to
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* skip over.
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*/
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if (sawesc)
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sawesc = 0;
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else
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p++;
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if (*p == '\0') {
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/*
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* This escaped character is continued
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* in the next part of the line. Note
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* this fact, then cause the loop to
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* exit w/ normal EOL case and reenter
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* above with the new buffer.
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*/
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sawesc = 1;
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p--;
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continue;
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} else if (strchr("123456789", *p) != NULL) {
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*sp++ = '\\';
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ref = *p - '0';
|
|
if (s->re != NULL &&
|
|
ref > s->re->re_nsub)
|
|
errx(1, "%lu: %s: \\%c not defined in the RE",
|
|
linenum, fname, *p);
|
|
if (s->maxbref < ref)
|
|
s->maxbref = ref;
|
|
} else if (*p == '&' || *p == '\\')
|
|
*sp++ = '\\';
|
|
} else if (*p == c) {
|
|
if (*++p == '\0' && more) {
|
|
if (cu_fgets(lbuf, sizeof(lbuf), &more))
|
|
p = lbuf;
|
|
}
|
|
*sp++ = '\0';
|
|
size += sp - op;
|
|
if ((s->new = realloc(text, size)) == NULL)
|
|
err(1, "realloc");
|
|
return (p);
|
|
} else if (*p == '\n') {
|
|
errx(1,
|
|
"%lu: %s: unescaped newline inside substitute pattern", linenum, fname);
|
|
/* NOTREACHED */
|
|
}
|
|
*sp++ = *p;
|
|
}
|
|
size += sp - op;
|
|
if (asize - size < _POSIX2_LINE_MAX + 1) {
|
|
asize *= 2;
|
|
if ((text = realloc(text, asize)) == NULL)
|
|
err(1, "realloc");
|
|
}
|
|
} while (cu_fgets(p = lbuf, sizeof(lbuf), &more) != NULL);
|
|
errx(1, "%lu: %s: unterminated substitute in regular expression",
|
|
linenum, fname);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* Compile the flags of the s command
|
|
*/
|
|
static char *
|
|
compile_flags(char *p, struct s_subst *s)
|
|
{
|
|
int gn; /* True if we have seen g or n */
|
|
unsigned long nval;
|
|
char wfile[_POSIX2_LINE_MAX + 1], *q, *eq;
|
|
|
|
s->n = 1; /* Default */
|
|
s->p = 0;
|
|
s->wfile = NULL;
|
|
s->wfd = -1;
|
|
s->icase = 0;
|
|
for (gn = 0;;) {
|
|
EATSPACE(); /* EXTENSION */
|
|
switch (*p) {
|
|
case 'g':
|
|
if (gn)
|
|
errx(1,
|
|
"%lu: %s: more than one number or 'g' in substitute flags", linenum, fname);
|
|
gn = 1;
|
|
s->n = 0;
|
|
break;
|
|
case '\0':
|
|
case '\n':
|
|
case ';':
|
|
return (p);
|
|
case 'p':
|
|
s->p = 1;
|
|
break;
|
|
case 'i':
|
|
case 'I':
|
|
s->icase = 1;
|
|
break;
|
|
case '1': case '2': case '3':
|
|
case '4': case '5': case '6':
|
|
case '7': case '8': case '9':
|
|
if (gn)
|
|
errx(1,
|
|
"%lu: %s: more than one number or 'g' in substitute flags", linenum, fname);
|
|
gn = 1;
|
|
errno = 0;
|
|
nval = strtol(p, &p, 10);
|
|
if (errno == ERANGE || nval > INT_MAX)
|
|
errx(1,
|
|
"%lu: %s: overflow in the 'N' substitute flag", linenum, fname);
|
|
s->n = nval;
|
|
p--;
|
|
break;
|
|
case 'w':
|
|
p++;
|
|
#ifdef HISTORIC_PRACTICE
|
|
if (*p != ' ') {
|
|
warnx("%lu: %s: space missing before w wfile", linenum, fname);
|
|
return (p);
|
|
}
|
|
#endif
|
|
EATSPACE();
|
|
q = wfile;
|
|
eq = wfile + sizeof(wfile) - 1;
|
|
while (*p) {
|
|
if (*p == '\n')
|
|
break;
|
|
if (q >= eq)
|
|
err(1, "wfile too long");
|
|
*q++ = *p++;
|
|
}
|
|
*q = '\0';
|
|
if (q == wfile)
|
|
errx(1, "%lu: %s: no wfile specified", linenum, fname);
|
|
s->wfile = strdup(wfile);
|
|
if (!aflag && (s->wfd = open(wfile,
|
|
O_WRONLY|O_APPEND|O_CREAT|O_TRUNC,
|
|
DEFFILEMODE)) == -1)
|
|
err(1, "%s", wfile);
|
|
return (p);
|
|
default:
|
|
errx(1, "%lu: %s: bad flag in substitute command: '%c'",
|
|
linenum, fname, *p);
|
|
break;
|
|
}
|
|
p++;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Compile a translation set of strings into a lookup table.
|
|
*/
|
|
static char *
|
|
compile_tr(char *p, struct s_tr **py)
|
|
{
|
|
struct s_tr *y;
|
|
int i;
|
|
const char *op, *np;
|
|
char old[_POSIX2_LINE_MAX + 1];
|
|
char new[_POSIX2_LINE_MAX + 1];
|
|
size_t oclen, oldlen, nclen, newlen;
|
|
mbstate_t mbs1, mbs2;
|
|
|
|
if ((*py = y = malloc(sizeof(*y))) == NULL)
|
|
err(1, NULL);
|
|
y->multis = NULL;
|
|
y->nmultis = 0;
|
|
|
|
if (*p == '\0' || *p == '\\')
|
|
errx(1,
|
|
"%lu: %s: transform pattern can not be delimited by newline or backslash",
|
|
linenum, fname);
|
|
p = compile_delimited(p, old, 1);
|
|
if (p == NULL)
|
|
errx(1, "%lu: %s: unterminated transform source string",
|
|
linenum, fname);
|
|
p = compile_delimited(p - 1, new, 1);
|
|
if (p == NULL)
|
|
errx(1, "%lu: %s: unterminated transform target string",
|
|
linenum, fname);
|
|
EATSPACE();
|
|
op = old;
|
|
oldlen = mbsrtowcs(NULL, &op, 0, NULL);
|
|
if (oldlen == (size_t)-1)
|
|
err(1, NULL);
|
|
np = new;
|
|
newlen = mbsrtowcs(NULL, &np, 0, NULL);
|
|
if (newlen == (size_t)-1)
|
|
err(1, NULL);
|
|
if (newlen != oldlen)
|
|
errx(1, "%lu: %s: transform strings are not the same length",
|
|
linenum, fname);
|
|
if (MB_CUR_MAX == 1) {
|
|
/*
|
|
* The single-byte encoding case is easy: generate a
|
|
* lookup table.
|
|
*/
|
|
for (i = 0; i <= UCHAR_MAX; i++)
|
|
y->bytetab[i] = (char)i;
|
|
for (; *op; op++, np++)
|
|
y->bytetab[(u_char)*op] = *np;
|
|
} else {
|
|
/*
|
|
* Multi-byte encoding case: generate a lookup table as
|
|
* above, but only for single-byte characters. The first
|
|
* bytes of multi-byte characters have their lookup table
|
|
* entries set to 0, which causes do_tr() to search through
|
|
* an auxiliary vector of multi-byte mappings.
|
|
*/
|
|
memset(&mbs1, 0, sizeof(mbs1));
|
|
memset(&mbs2, 0, sizeof(mbs2));
|
|
for (i = 0; i <= UCHAR_MAX; i++)
|
|
y->bytetab[i] = (btowc(i) != WEOF) ? i : 0;
|
|
while (*op != '\0') {
|
|
oclen = mbrlen(op, MB_LEN_MAX, &mbs1);
|
|
if (oclen == (size_t)-1 || oclen == (size_t)-2)
|
|
errc(1, EILSEQ, NULL);
|
|
nclen = mbrlen(np, MB_LEN_MAX, &mbs2);
|
|
if (nclen == (size_t)-1 || nclen == (size_t)-2)
|
|
errc(1, EILSEQ, NULL);
|
|
if (oclen == 1 && nclen == 1)
|
|
y->bytetab[(u_char)*op] = *np;
|
|
else {
|
|
y->bytetab[(u_char)*op] = 0;
|
|
y->multis = realloc(y->multis,
|
|
(y->nmultis + 1) * sizeof(*y->multis));
|
|
if (y->multis == NULL)
|
|
err(1, NULL);
|
|
i = y->nmultis++;
|
|
y->multis[i].fromlen = oclen;
|
|
memcpy(y->multis[i].from, op, oclen);
|
|
y->multis[i].tolen = nclen;
|
|
memcpy(y->multis[i].to, np, nclen);
|
|
}
|
|
op += oclen;
|
|
np += nclen;
|
|
}
|
|
}
|
|
return (p);
|
|
}
|
|
|
|
/*
|
|
* Compile the text following an a, c, or i command.
|
|
*/
|
|
static char *
|
|
compile_text(void)
|
|
{
|
|
int asize, esc_nl, size;
|
|
char *text, *p, *op, *s;
|
|
char lbuf[_POSIX2_LINE_MAX + 1];
|
|
|
|
asize = 2 * _POSIX2_LINE_MAX + 1;
|
|
if ((text = malloc(asize)) == NULL)
|
|
err(1, "malloc");
|
|
size = 0;
|
|
while (cu_fgets(lbuf, sizeof(lbuf), NULL) != NULL) {
|
|
op = s = text + size;
|
|
p = lbuf;
|
|
#ifdef LEGACY_BSDSED_COMPAT
|
|
EATSPACE();
|
|
#endif
|
|
for (esc_nl = 0; *p != '\0'; p++) {
|
|
if (*p == '\\' && p[1] != '\0' && *++p == '\n')
|
|
esc_nl = 1;
|
|
*s++ = *p;
|
|
}
|
|
size += s - op;
|
|
if (!esc_nl) {
|
|
*s = '\0';
|
|
break;
|
|
}
|
|
if (asize - size < _POSIX2_LINE_MAX + 1) {
|
|
asize *= 2;
|
|
if ((text = realloc(text, asize)) == NULL)
|
|
err(1, "realloc");
|
|
}
|
|
}
|
|
text[size] = '\0';
|
|
if ((p = realloc(text, size + 1)) == NULL)
|
|
err(1, "realloc");
|
|
return (p);
|
|
}
|
|
|
|
/*
|
|
* 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(char *p, struct s_addr *a)
|
|
{
|
|
char *end, re[_POSIX2_LINE_MAX + 1];
|
|
int icase;
|
|
|
|
icase = 0;
|
|
|
|
a->type = 0;
|
|
switch (*p) {
|
|
case '\\': /* Context address */
|
|
++p;
|
|
/* FALLTHROUGH */
|
|
case '/': /* Context address */
|
|
p = compile_delimited(p, re, 0);
|
|
if (p == NULL)
|
|
errx(1, "%lu: %s: unterminated regular expression", linenum, fname);
|
|
/* Check for case insensitive regexp flag */
|
|
if (*p == 'I') {
|
|
icase = 1;
|
|
p++;
|
|
}
|
|
if (*re == '\0')
|
|
a->u.r = NULL;
|
|
else
|
|
a->u.r = compile_re(re, icase);
|
|
a->type = AT_RE;
|
|
return (p);
|
|
|
|
case '$': /* Last line */
|
|
a->type = AT_LAST;
|
|
return (p + 1);
|
|
|
|
case '+': /* Relative line number */
|
|
a->type = AT_RELLINE;
|
|
p++;
|
|
/* FALLTHROUGH */
|
|
/* Line number */
|
|
case '0': case '1': case '2': case '3': case '4':
|
|
case '5': case '6': case '7': case '8': case '9':
|
|
if (a->type == 0)
|
|
a->type = AT_LINE;
|
|
a->u.l = strtol(p, &end, 10);
|
|
return (end);
|
|
default:
|
|
errx(1, "%lu: %s: expected context address", linenum, fname);
|
|
return (NULL);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* duptoeol --
|
|
* Return a copy of all the characters up to \n or \0.
|
|
*/
|
|
static char *
|
|
duptoeol(char *s, const char *ctype)
|
|
{
|
|
size_t len;
|
|
int ws;
|
|
char *p, *start;
|
|
|
|
ws = 0;
|
|
for (start = s; *s != '\0' && *s != '\n'; ++s)
|
|
ws = isspace((unsigned char)*s);
|
|
*s = '\0';
|
|
if (ws)
|
|
warnx("%lu: %s: whitespace after %s", linenum, fname, ctype);
|
|
len = s - start + 1;
|
|
if ((p = malloc(len)) == NULL)
|
|
err(1, "malloc");
|
|
return (memmove(p, 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(struct s_command *cp, struct s_command *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)
|
|
errx(1, "%lu: %s: undefined label '%s'", linenum, fname, 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(struct s_command *cp)
|
|
{
|
|
struct labhash **lhp, *lh;
|
|
u_char *p;
|
|
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)
|
|
errx(1, "%lu: %s: duplicate label '%s'", linenum, fname, cp->t);
|
|
if ((lh = malloc(sizeof *lh)) == NULL)
|
|
err(1, "malloc");
|
|
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(char *name)
|
|
{
|
|
struct labhash *lh;
|
|
u_char *p;
|
|
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(void)
|
|
{
|
|
struct labhash *lh, *next;
|
|
int i;
|
|
|
|
for (i = 0; i < LHSZ; i++) {
|
|
for (lh = labels[i]; lh != NULL; lh = next) {
|
|
next = lh->lh_next;
|
|
if (!lh->lh_ref)
|
|
warnx("%lu: %s: unused label '%s'",
|
|
linenum, fname, lh->lh_cmd->t);
|
|
free(lh);
|
|
}
|
|
}
|
|
}
|