1 const char miscutil_rcs[] = "$Id: miscutil.c,v 1.4 2001/05/31 17:32:31 oes Exp $";
2 /*********************************************************************
4 * File : $Source: /cvsroot/ijbswa/current/miscutil.c,v $
6 * Purpose : zalloc, hash_string, safe_strerror, strcmpic,
7 * strncmpic, strsav, chomp, and MinGW32 strdup
9 * These are each too small to deserve their own file
10 * but don't really fit in any other file.
12 * Copyright : Written by and Copyright (C) 2001 the SourceForge
13 * IJBSWA team. http://ijbswa.sourceforge.net
15 * Based on the Internet Junkbuster originally written
16 * by and Copyright (C) 1997 Anonymous Coders and
17 * Junkbusters Corporation. http://www.junkbusters.com
19 * This program is free software; you can redistribute it
20 * and/or modify it under the terms of the GNU General
21 * Public License as published by the Free Software
22 * Foundation; either version 2 of the License, or (at
23 * your option) any later version.
25 * This program is distributed in the hope that it will
26 * be useful, but WITHOUT ANY WARRANTY; without even the
27 * implied warranty of MERCHANTABILITY or FITNESS FOR A
28 * PARTICULAR PURPOSE. See the GNU General Public
29 * License for more details.
31 * The GNU General Public License should be included with
32 * this file. If not, you can view it at
33 * http://www.gnu.org/copyleft/gpl.html
34 * or write to the Free Software Foundation, Inc., 59
35 * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
38 * $Log: miscutil.c,v $
39 * Revision 1.4 2001/05/31 17:32:31 oes
41 * - Enhanced domain part globbing with infix and prefix asterisk
42 * matching and optional unanchored operation
44 * Revision 1.3 2001/05/29 23:10:09 oes
47 * - Introduced chomp()
48 * - Moved strsav() from showargs to miscutil
50 * Revision 1.2 2001/05/29 09:50:24 jongfoster
51 * Unified blocklist/imagelist/permissionslist.
52 * File format is still under discussion, but the internal changes
55 * Also modified interceptor behaviour:
56 * - We now intercept all URLs beginning with one of the following
57 * prefixes (and *only* these prefixes):
59 * * http://ijbswa.sf.net/config/
60 * * http://ijbswa.sourceforge.net/config/
61 * - New interceptors "home page" - go to http://i.j.b/ to see it.
62 * - Internal changes so that intercepted and fast redirect pages
63 * are not replaced with an image.
64 * - Interceptors now have the option to send a binary page direct
65 * to the client. (i.e. ijb-send-banner uses this)
66 * - Implemented show-url-info interceptor. (Which is why I needed
67 * the above interceptors changes - a typical URL is
68 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
69 * The previous mechanism would not have intercepted that, and
70 * if it had been intercepted then it then it would have replaced
73 * Revision 1.1.1.1 2001/05/15 13:59:00 oes
74 * Initial import of version 2.9.3 source tree
77 *********************************************************************/
91 const char miscutil_h_rcs[] = MISCUTIL_H_VERSION;
93 /* Fix a problem with Solaris. There should be no effect on other
95 * Solaris's isspace() is a macro which uses it's argument directly
96 * as an array index. Therefore we need to make sure that high-bit
97 * characters generate +ve values, and ideally we also want to make
98 * the argument match the declared parameter type of "int".
100 #define ijb_tolower(__X) tolower((int)(unsigned char)(__X))
101 #define ijb_isspace(__X) isspace((int)(unsigned char)(__X))
103 /*********************************************************************
107 * Description : Malloc some memory and set it to '\0'.
108 * The way calloc() ought to be -acjc
111 * 1 : size = Size of memory chunk to return.
113 * Returns : Pointer to newly malloc'd memory chunk.
115 *********************************************************************/
116 void *zalloc(int size)
120 if ((ret = (void *)malloc(size)) != NULL)
122 memset(ret, 0, size);
129 /*********************************************************************
131 * Function : hash_string
133 * Description : Take a string and compute a (hopefuly) unique numeric
134 * integer value. This has several uses, but being able
135 * to "switch" a string the one of my favorites.
138 * 1 : s : string to be hashed.
140 * Returns : an unsigned long variable with the hashed value.
142 *********************************************************************/
143 unsigned long hash_string( const char* s )
145 unsigned long h = 0ul;
158 /*********************************************************************
162 * Description : For some reason (which is beyond me), gcc and WIN32
163 * don't like strdup. When a "free" is executed on a
164 * strdup'd ptr, it can at times freez up! So I just
165 * replaced it and problem was solved.
168 * 1 : s = string to duplicate
170 * Returns : Pointer to newly malloc'ed copy of the string.
172 *********************************************************************/
173 char *strdup( const char *s )
175 char * result = (char *)malloc( strlen(s)+1 );
185 #endif /* def __MINGW32__ */
189 /*********************************************************************
191 * Function : safe_strerror
193 * Description : Variant of the library routine strerror() which will
194 * work on systems without the library routine, and
195 * which should never return NULL.
198 * 1 : err = the `errno' of the last operation.
200 * Returns : An "English" string of the last `errno'. Allocated
201 * with strdup(), so caller frees. May be NULL if the
202 * system is out of memory.
204 *********************************************************************/
205 char *safe_strerror(int err)
213 #endif /* NOSTRERROR */
217 sprintf(buf, "(errno = %d)", err);
226 /*********************************************************************
228 * Function : strcmpic
230 * Description : Case insensitive string comparison
233 * 1 : s1 = string 1 to compare
234 * 2 : s2 = string 2 to compare
236 * Returns : 0 if s1==s2, Negative if s1<s2, Positive if s1>s2
238 *********************************************************************/
239 int strcmpic(const char *s1, const char *s2)
243 if ( ( *s1 != *s2 ) && ( ijb_tolower(*s1) != ijb_tolower(*s2) ) )
249 return(ijb_tolower(*s1) - ijb_tolower(*s2));
254 /*********************************************************************
256 * Function : strncmpic
258 * Description : Case insensitive string comparison (upto n characters)
261 * 1 : s1 = string 1 to compare
262 * 2 : s2 = string 2 to compare
263 * 3 : n = maximum characters to compare
265 * Returns : 0 if s1==s2, Negative if s1<s2, Positive if s1>s2
267 *********************************************************************/
268 int strncmpic(const char *s1, const char *s2, size_t n)
270 if (n <= 0) return(0);
274 if ( ( *s1 != *s2 ) && ( ijb_tolower(*s1) != ijb_tolower(*s2) ) )
283 return(ijb_tolower(*s1) - ijb_tolower(*s2));
288 /*********************************************************************
292 * Description : In-situ-eliminate all leading and trailing whitespace
296 * 1 : s : string to be chomped.
298 * Returns : chomped string
300 *********************************************************************/
301 char *chomp(char *string)
306 * strip trailing whitespace
308 p = string + strlen(string);
309 while (p > string && ijb_isspace(*(p-1)))
316 * find end of leading whitespace
319 while (*q && ijb_isspace(*q))
325 * if there was any, move the rest forwards
339 /*********************************************************************
343 * Description : Reallocate "old" and append text to it. This makes
344 * it easier to append to malloc'd strings.
347 * 1 : old = Old text that is to be extended. Will be
348 * free()d by this routine.
349 * 2 : text_to_append = Text to be appended to old.
351 * Returns : Pointer to newly malloc'ed appended string.
352 * If there is no text to append, return old. Caller
355 *********************************************************************/
356 char *strsav(char *old, const char *text_to_append)
358 int old_len, new_len;
361 if (( text_to_append == NULL) || (*text_to_append == '\0'))
368 old_len = strlen(old);
375 new_len = old_len + strlen(text_to_append) + 1;
379 if ((p = realloc(old, new_len)) == NULL)
381 log_error(LOG_LEVEL_FATAL, "realloc(%d) bytes failed!", new_len);
382 /* Never get here - LOG_LEVEL_FATAL causes program exit */
387 if ((p = (char *)malloc(new_len)) == NULL)
389 log_error(LOG_LEVEL_FATAL, "malloc(%d) bytes failed!", new_len);
390 /* Never get here - LOG_LEVEL_FATAL causes program exit */
394 strcpy(p + old_len, text_to_append);
400 /*********************************************************************
402 * Function : simplematch
404 * Description : String matching, with a (greedy) '*' wildcard that
405 * stands for zero or more arbitrary characters and
406 * character classes in [], which take both enumerations
410 * 1 : pattern = pattern for matching
411 * 2 : text = text to be matched
413 * Returns : 0 if match, else nonzero
415 *********************************************************************/
416 int simplematch(char *pattern, char *text)
425 unsigned char charmap[32];
431 /* EOF pattern but !EOF text? */
437 /* '*' in the pattern? */
441 /* The pattern ends afterwards? Speed up the return. */
447 /* Else, set wildcard mode and remember position after '*' */
452 /* Character range specification? */
455 memset(charmap, '\0', sizeof(charmap));
457 while (*++pat != ']')
463 else if (*pat == '-')
465 if ((*++pat == ']') || *pat == '\0')
469 for(i = lastchar; i <= *pat; i++)
471 charmap[i / 8] |= (1 << (i % 8));
476 charmap[*pat / 8] |= (1 << (*pat % 8));
480 } /* -END- if Character range specification */
483 /* Compare: Char match, or char range match*/
485 || ((*pat == ']') && (charmap[*txt / 8] & (1 << (*txt % 8)))) )
487 /* Sucess, go ahead */
492 /* In wildcard mode, just try again after failiure */
507 /* Cut off extra '*'s */
508 if(*pat == '*') pat++;
510 /* If this is the pattern's end, fine! */