usr.bin/error/filter.c

   1 /*      $NetBSD: filter.c,v 1.14 2009/08/13 04:09:53 dholland Exp $     */
   2
   3 /*
   4  * Copyright (c) 1980, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)filter.c    8.1 (Berkeley) 6/6/93";
  36 #endif
  37 __RCSID("$NetBSD: filter.c,v 1.14 2009/08/13 04:09:53 dholland Exp $");
  38 #endif /* not lint */
  39
  40 #include <sys/param.h>
  41 #include <pwd.h>
  42 #include <unistd.h>
  43 #include <stdio.h>
  44 #include <ctype.h>
  45 #include <stdlib.h>
  46 #include <string.h>
  47 #include "error.h"
  48 #include "pathnames.h"
  49
  50 static const char *lint_libs[] = {
  51         IG_FILE1,
  52         IG_FILE2,
  53         IG_FILE3,
  54         IG_FILE4,
  55         0
  56 };
  57
  58 static int lexsort(const void *, const void *);
  59 static int search_ignore(const char *);
  60
  61 /*
  62  * Read the file ERRORNAME of the names of functions in lint
  63  * to ignore complaints about.
  64  */
  65 void
  66 getignored(const char *auxname)
  67 {
  68         int i;
  69         FILE *fyle;
  70         char inbuffer[256];
  71         uid_t uid;
  72         char filename[MAXPATHLEN];
  73         const char *username;
  74         struct passwd *passwdentry;
  75
  76         nignored = 0;
  77         if (auxname == 0) {     /* use the default */
  78                 if ((username = getlogin()) == NULL) {
  79                         username = "Unknown";
  80                         uid = getuid();
  81                         if ((passwdentry = getpwuid(uid)) == NULL) {
  82                                 return;
  83                         }
  84                 } else {
  85                         if ((passwdentry = getpwnam(username)) == NULL)
  86                                 return;
  87                 }
  88                 strlcpy(filename, passwdentry->pw_dir, sizeof(filename));
  89                 (void)strlcat(filename, ERRORNAME, sizeof(filename));
  90         } else
  91                 (void)strlcpy(filename, auxname, sizeof(filename));
  92 #ifdef FULLDEBUG
  93         printf("Opening file \"%s\" to read names to ignore.\n",
  94                 filename);
  95 #endif
  96         if ((fyle = fopen(filename, "r")) == NULL) {
  97 #ifdef FULLDEBUG
  98                 fprintf(stderr, "%s: Can't open file \"%s\"\n",
  99                         processname, filename);
 100 #endif
 101                 return;
 102         }
 103
 104         /*
 105          * Make the first pass through the file, counting lines
 106          */
 107         for (nignored = 0;
 108              fgets(inbuffer, sizeof(inbuffer)-1, fyle) != NULL; nignored++)
 109                 continue;
 110         names_ignored = Calloc(nignored+1, sizeof (char *));
 111         fclose(fyle);
 112         if (freopen(filename, "r", fyle) == NULL) {
 113 #ifdef FULLDEBUG
 114                 fprintf(stderr, "%s: Failure to open \"%s\" for second read.\n",
 115                         processname, filename);
 116 #endif
 117                 nignored = 0;
 118                 return;
 119         }
 120         for (i=0; i < nignored &&
 121                   (fgets (inbuffer, sizeof(inbuffer)-1, fyle) != NULL); i++) {
 122                 names_ignored[i] = strdup(inbuffer);
 123                 (void)substitute(names_ignored[i], '\n', '\0');
 124         }
 125         qsort(names_ignored, nignored, sizeof *names_ignored, lexsort);
 126 #ifdef FULLDEBUG
 127         printf("Names to ignore follow.\n");
 128         for (i=0; i < nignored; i++) {
 129                 printf("\tIgnore: %s\n", names_ignored[i]);
 130         }
 131 #endif
 132 }
 133
 134 static int
 135 lexsort(const void *c1, const void *c2)
 136 {
 137         const char *const *cpp1;
 138         const char *const *cpp2;
 139
 140         cpp1 = c1;
 141         cpp2 = c2;
 142         return (strcmp(*cpp1, *cpp2));
 143 }
 144
 145 static int
 146 search_ignore(const char *key)
 147 {
 148         int ub, lb;
 149         int halfway;
 150         int order;
 151
 152         if (nignored == 0)
 153                 return (-1);
 154         for (lb = 0, ub = nignored - 1; ub >= lb; ) {
 155                 halfway = (ub + lb)/2;
 156                 if ( (order = strcmp(key, names_ignored[halfway])) == 0)
 157                         return (halfway);
 158                 if (order < 0)  /* key is less than probe, throw away above */
 159                         ub = halfway - 1;
 160                  else
 161                         lb = halfway + 1;
 162         }
 163         return (-1);
 164 }
 165
 166 /*
 167  * Tell if the error text is to be ignored.
 168  * The error must have been canonicalized, with
 169  * the file name the zeroth entry in the errorv,
 170  * and the linenumber the second.
 171  * Return the new categorization of the error class.
 172  */
 173 Errorclass
 174 discardit(Eptr errorp)
 175 {
 176         int i;
 177         Errorclass errorclass = errorp->error_e_class;
 178
 179         switch (errorclass) {
 180                 case C_SYNC:
 181                 case C_NONSPEC:
 182                 case C_UNKNOWN: return (errorclass);
 183                 default:        ;
 184         }
 185         if (errorp->error_lgtext < 2) {
 186                 return (C_NONSPEC);
 187         }
 188         if (errorp->error_language == INLINT) {
 189                 if (errorclass != C_NONSPEC) {  /* no file */
 190                         for (i=0; lint_libs[i] != 0; i++) {
 191                                 if (strcmp(errorp->error_text[0], lint_libs[i]) == 0) {
 192                                         return (C_DISCARD);
 193                                 }
 194                         }
 195                 }
 196                 /* check if the argument to the error message is to be ignored */
 197                 if (ispunct((unsigned char)lastchar(errorp->error_text[2])))
 198                         clob_last(errorp->error_text[2], '\0');
 199                 if (search_ignore(errorp->error_text[errorclass == C_NONSPEC ? 0 : 2]) >= 0) {
 200                         return (C_NULLED);
 201                 }
 202         }
 203         return (errorclass);
 204 }