263 lines
7.9 KiB
C
263 lines
7.9 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* ------+---------+---------+---------+---------+---------+---------+---------*
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* Copyright (c) 2001 - Garance Alistair Drosehn <gad@FreeBSD.org>.
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* All rights reserved.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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* The views and conclusions contained in the software and documentation
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* are those of the authors and should not be interpreted as representing
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* official policies, either expressed or implied, of the FreeBSD Project.
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*
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* ------+---------+---------+---------+---------+---------+---------+---------*
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*/
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#include "lp.cdefs.h" /* A cross-platform version of <sys/cdefs.h> */
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#include <sys/types.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 <grp.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/param.h> /* needed for lp.h but not used here */
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#include <dirent.h> /* ditto */
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#include "lp.h"
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#include "lp.local.h"
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#include "skimprintcap.h"
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/*
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* Save the canonical queue name of the entry that is currently being
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* scanned, in case a warning message is printed for the current queue.
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* Only the first 'QENTRY_MAXLEN' characters will be saved, since this
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* is only for warning messages. The variable includes space for the
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* string " (entry " and a trailing ")", when the scanner is in the
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* middle of an entry. When the scanner is not in a specific entry,
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* the variable will be the a null string.
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*/
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#define QENTRY_MAXLEN 30
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#define QENTRY_PREFIX " (entry "
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static char skim_entryname[sizeof(QENTRY_PREFIX) + QENTRY_MAXLEN + 2];
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/*
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* isgraph is defined to work on an 'int', in the range 0 to 255, plus EOF.
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* Define a wrapper which can take 'char', either signed or unsigned.
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*/
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#define isgraphch(Anychar) isgraph(((int) Anychar) & 255)
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struct skiminfo *
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skim_printcap(const char *pcap_fname, int verbosity)
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{
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struct skiminfo *skinf;
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char buff[BUFSIZ];
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char *ch, *curline, *endfield, *lastchar;
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FILE *pc_file;
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int missing_nl;
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enum {NO_CONTINUE, WILL_CONTINUE, BAD_CONTINUE} is_cont, had_cont;
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enum {CMNT_LINE, ENTRY_LINE, TAB_LINE, TABERR_LINE} is_type, had_type;
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skinf = malloc(sizeof(struct skiminfo));
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if (skinf == NULL)
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return (NULL);
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memset(skinf, 0, sizeof(struct skiminfo));
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pc_file = fopen(pcap_fname, "r");
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if (pc_file == NULL) {
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warn("fopen(%s)", pcap_fname);
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skinf->fatalerr++;
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return (skinf); /* fatal error */
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}
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skim_entryname[0] = '0';
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is_cont = NO_CONTINUE;
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is_type = CMNT_LINE;
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errno = 0;
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curline = fgets(buff, sizeof(buff), pc_file);
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while (curline != NULL) {
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skinf->lines++;
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/* Check for the expected newline char, and remove it */
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missing_nl = 0;
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lastchar = strchr(curline, '\n');
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if (lastchar != NULL)
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*lastchar = '\0';
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else {
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lastchar = strchr(curline, '\0');
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missing_nl = 1;
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}
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if (curline < lastchar)
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lastchar--;
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/*
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* Check for `\' (continuation-character) at end of line.
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* If there is none, then trim off spaces and check again.
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* This would be a bad line because it looks like it is
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* continued, but it will not be treated that way.
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*/
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had_cont = is_cont;
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is_cont = NO_CONTINUE;
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if (*lastchar == '\\') {
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is_cont = WILL_CONTINUE;
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lastchar--;
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} else {
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while ((curline < lastchar) && !isgraphch(*lastchar))
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lastchar--;
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if (*lastchar == '\\')
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is_cont = BAD_CONTINUE;
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}
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had_type = is_type;
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is_type = CMNT_LINE;
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switch (*curline) {
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case '\0': /* treat zero-length line as comment */
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case '#':
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skinf->comments++;
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break;
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case ' ':
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case '\t':
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is_type = TAB_LINE;
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break;
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default:
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is_type = ENTRY_LINE;
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skinf->entries++;
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/* pick up the queue name, to use in warning messages */
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ch = curline;
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while ((ch <= lastchar) && (*ch != ':') && (*ch != '|'))
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ch++;
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ch--; /* last char of queue name */
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strcpy(skim_entryname, QENTRY_PREFIX);
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if ((ch - curline) > QENTRY_MAXLEN) {
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strncat(skim_entryname, curline, QENTRY_MAXLEN
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- 1);
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strcat(skim_entryname, "+");
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} else {
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strncat(skim_entryname, curline, (ch - curline
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+ 1));
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}
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strlcat(skim_entryname, ")", sizeof(skim_entryname));
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break;
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}
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/*
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* Check to see if the previous line was a bad contination
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* line. The check is delayed until now so a warning message
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* is not printed when a "bad continuation" is on a comment
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* line, and it just "continues" into another comment line.
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*/
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if (had_cont == BAD_CONTINUE) {
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if ((had_type != CMNT_LINE) || (is_type != CMNT_LINE) ||
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(verbosity > 1)) {
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skinf->warnings++;
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warnx("Warning: blanks after trailing '\\',"
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" at line %d%s", skinf->lines - 1,
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skim_entryname);
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}
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}
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/* If we are no longer in an entry, then forget the name */
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if ((had_cont != WILL_CONTINUE) && (is_type != ENTRY_LINE)) {
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skim_entryname[0] = '\0';
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}
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/*
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* Print out warning for missing newline, done down here
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* so we are sure to have the right entry-name for it.
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*/
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if (missing_nl) {
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skinf->warnings++;
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warnx("Warning: No newline at end of line %d%s",
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skinf->lines, skim_entryname);
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}
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/*
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* Check for start-of-entry lines which do not include a
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* ":" character (to indicate the end of the name field).
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* This can cause standard printcap processing to ignore
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* ALL of the following lines.
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* XXXXX - May need to allow for the list-of-names to
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* continue on to the following line...
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*/
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if (is_type == ENTRY_LINE) {
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endfield = strchr(curline, ':');
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if (endfield == NULL) {
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skinf->warnings++;
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warnx("Warning: No ':' to terminate name-field"
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" at line %d%s", skinf->lines,
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skim_entryname);
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}
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}
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/*
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* Now check for cases where this line is (or is-not) a
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* continuation of the previous line, and a person skimming
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* the file would assume it is not (or is) a continuation.
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*/
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switch (had_cont) {
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case NO_CONTINUE:
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case BAD_CONTINUE:
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if (is_type == TAB_LINE) {
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skinf->warnings++;
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warnx("Warning: values-line after line with"
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" NO trailing '\\', at line %d%s",
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skinf->lines, skim_entryname);
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}
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break;
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case WILL_CONTINUE:
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if (is_type == ENTRY_LINE) {
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skinf->warnings++;
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warnx("Warning: new entry starts after line"
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" with trailing '\\', at line %d%s",
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skinf->lines, skim_entryname);
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}
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break;
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}
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/* get another line from printcap and repeat loop */
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curline = fgets(buff, sizeof(buff), pc_file);
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}
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if (errno != 0) {
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warn("fgets(%s)", pcap_fname);
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skinf->fatalerr++; /* fatal error */
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}
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if (skinf->warnings > 0)
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warnx("%4d warnings from skimming %s", skinf->warnings,
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pcap_fname);
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if (verbosity)
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warnx("%4d lines (%d comments), %d entries for %s",
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skinf->lines, skinf->comments, skinf->entries, pcap_fname);
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fclose(pc_file);
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return (skinf);
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}
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