1 const char miscutil_rcs[] = "$Id: miscutil.c,v 1.2 2001/05/29 09:50:24 jongfoster 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 1.2 2001/05/29 09:50:24 jongfoster
40 * Unified blocklist/imagelist/permissionslist.
41 * File format is still under discussion, but the internal changes
44 * Also modified interceptor behaviour:
45 * - We now intercept all URLs beginning with one of the following
46 * prefixes (and *only* these prefixes):
48 * * http://ijbswa.sf.net/config/
49 * * http://ijbswa.sourceforge.net/config/
50 * - New interceptors "home page" - go to http://i.j.b/ to see it.
51 * - Internal changes so that intercepted and fast redirect pages
52 * are not replaced with an image.
53 * - Interceptors now have the option to send a binary page direct
54 * to the client. (i.e. ijb-send-banner uses this)
55 * - Implemented show-url-info interceptor. (Which is why I needed
56 * the above interceptors changes - a typical URL is
57 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
58 * The previous mechanism would not have intercepted that, and
59 * if it had been intercepted then it then it would have replaced
62 * Revision 1.1.1.1 2001/05/15 13:59:00 oes
63 * Initial import of version 2.9.3 source tree
66 *********************************************************************/
80 const char miscutil_h_rcs[] = MISCUTIL_H_VERSION;
82 /* Fix a problem with Solaris. There should be no effect on other
84 * Solaris's isspace() is a macro which uses it's argument directly
85 * as an array index. Therefore we need to make sure that high-bit
86 * characters generate +ve values, and ideally we also want to make
87 * the argument match the declared parameter type of "int".
89 #define ijb_tolower(__X) tolower((int)(unsigned char)(__X))
90 #define ijb_isspace(__X) isspace((int)(unsigned char)(__X))
92 /*********************************************************************
96 * Description : Malloc some memory and set it to '\0'.
97 * The way calloc() ought to be -acjc
100 * 1 : size = Size of memory chunk to return.
102 * Returns : Pointer to newly malloc'd memory chunk.
104 *********************************************************************/
105 void *zalloc(int size)
109 if ((ret = (void *)malloc(size)) != NULL)
111 memset(ret, 0, size);
118 /*********************************************************************
120 * Function : hash_string
122 * Description : Take a string and compute a (hopefuly) unique numeric
123 * integer value. This has several uses, but being able
124 * to "switch" a string the one of my favorites.
127 * 1 : s : string to be hashed.
129 * Returns : an unsigned long variable with the hashed value.
131 *********************************************************************/
132 unsigned long hash_string( const char* s )
134 unsigned long h = 0ul;
147 /*********************************************************************
151 * Description : For some reason (which is beyond me), gcc and WIN32
152 * don't like strdup. When a "free" is executed on a
153 * strdup'd ptr, it can at times freez up! So I just
154 * replaced it and problem was solved.
157 * 1 : s = string to duplicate
159 * Returns : Pointer to newly malloc'ed copy of the string.
161 *********************************************************************/
162 char *strdup( const char *s )
164 char * result = (char *)malloc( strlen(s)+1 );
174 #endif /* def __MINGW32__ */
178 /*********************************************************************
180 * Function : safe_strerror
182 * Description : Variant of the library routine strerror() which will
183 * work on systems without the library routine, and
184 * which should never return NULL.
187 * 1 : err = the `errno' of the last operation.
189 * Returns : An "English" string of the last `errno'. Allocated
190 * with strdup(), so caller frees. May be NULL if the
191 * system is out of memory.
193 *********************************************************************/
194 char *safe_strerror(int err)
202 #endif /* NOSTRERROR */
206 sprintf(buf, "(errno = %d)", err);
215 /*********************************************************************
217 * Function : strcmpic
219 * Description : Case insensitive string comparison
222 * 1 : s1 = string 1 to compare
223 * 2 : s2 = string 2 to compare
225 * Returns : 0 if s1==s2, Negative if s1<s2, Positive if s1>s2
227 *********************************************************************/
228 int strcmpic(const char *s1, const char *s2)
232 if ( ( *s1 != *s2 ) && ( ijb_tolower(*s1) != ijb_tolower(*s2) ) )
238 return(ijb_tolower(*s1) - ijb_tolower(*s2));
243 /*********************************************************************
245 * Function : strncmpic
247 * Description : Case insensitive string comparison (upto n characters)
250 * 1 : s1 = string 1 to compare
251 * 2 : s2 = string 2 to compare
252 * 3 : n = maximum characters to compare
254 * Returns : 0 if s1==s2, Negative if s1<s2, Positive if s1>s2
256 *********************************************************************/
257 int strncmpic(const char *s1, const char *s2, size_t n)
259 if (n <= 0) return(0);
263 if ( ( *s1 != *s2 ) && ( ijb_tolower(*s1) != ijb_tolower(*s2) ) )
272 return(ijb_tolower(*s1) - ijb_tolower(*s2));
277 /*********************************************************************
281 * Description : In-situ-eliminate all leading and trailing whitespace
285 * 1 : s : string to be chomped.
287 * Returns : chomped string
289 *********************************************************************/
290 char *chomp(char *string)
295 * strip trailing whitespace
297 p = string + strlen(string);
298 while (p > string && ijb_isspace(*(p-1)))
305 * find end of leading whitespace
308 while (*q && ijb_isspace(*q))
314 * if there was any, move the rest forwards
328 /*********************************************************************
332 * Description : Reallocate "old" and append text to it. This makes
333 * it easier to append to malloc'd strings.
336 * 1 : old = Old text that is to be extended. Will be
337 * free()d by this routine.
338 * 2 : text_to_append = Text to be appended to old.
340 * Returns : Pointer to newly malloc'ed appended string.
341 * If there is no text to append, return old. Caller
344 *********************************************************************/
345 char *strsav(char *old, const char *text_to_append)
347 int old_len, new_len;
350 if (( text_to_append == NULL) || (*text_to_append == '\0'))
357 old_len = strlen(old);
364 new_len = old_len + strlen(text_to_append) + 1;
368 if ((p = realloc(old, new_len)) == NULL)
370 log_error(LOG_LEVEL_FATAL, "realloc(%d) bytes failed!", new_len);
371 /* Never get here - LOG_LEVEL_FATAL causes program exit */
376 if ((p = (char *)malloc(new_len)) == NULL)
378 log_error(LOG_LEVEL_FATAL, "malloc(%d) bytes failed!", new_len);
379 /* Never get here - LOG_LEVEL_FATAL causes program exit */
383 strcpy(p + old_len, text_to_append);