]>
jfr.im git - irc/quakenet/snircd.git/blob - ircd/ircd_string.c
2 * IRC - Internet Relay Chat, ircd/ircd_string.c
3 * Copyright (C) 1999 Thomas Helvey
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 1, or (at your option)
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 * @brief Implementation of string operations.
21 * @version $Id: ircd_string.c,v 1.24 2005/09/12 16:11:58 entrope Exp $
25 #include "ircd_string.h"
26 #include "ircd_defs.h"
27 #include "ircd_chattr.h"
31 /* #include <assert.h> -- Now using assert in ircd_log.h */
33 #include <sys/types.h>
34 #include <netinet/in.h>
37 * include the character attribute tables here
39 #include "chattr.tab.c"
41 /** Check whether \a str contains wildcard characters.
42 * @param[in] str String that might contain wildcards.
43 * @return Non-zero if \a str contains naked (non-escaped) wildcards,
44 * zero if there are none or if they are all escaped.
46 int string_has_wildcards(const char* str
)
49 for ( ; *str
; ++str
) {
54 else if ('*' == *str
|| '?' == *str
)
60 /** Split a string on certain delimiters.
61 * This is a reentrant version of normal strtok(). The first call for
62 * a particular input string must use a non-NULL \a str; *save will be
63 * initialized based on that. Later calls must use a NULL \a str;
64 * *save will be updated.
65 * @param[in,out] save Pointer to a position indicator.
66 * @param[in] str Pointer to the input string, or NULL to continue.
67 * @param[in] fs String that lists token delimiters.
68 * @return Next token in input string, or NULL if no tokens remain.
70 char* ircd_strtok(char **save
, char *str
, char *fs
)
72 char *pos
= *save
; /* keep last position across calls */
76 pos
= str
; /* new string scan */
78 while (pos
&& *pos
&& strchr(fs
, *pos
) != NULL
)
79 pos
++; /* skip leading separators */
82 return (pos
= *save
= NULL
); /* string contains only sep's */
84 tmp
= pos
; /* now, keep position of the token */
86 while (*pos
&& strchr(fs
, *pos
) == NULL
)
87 pos
++; /* skip content of the token */
90 *pos
++ = '\0'; /* remove first sep after the token */
92 pos
= NULL
; /* end of string */
98 /** Rewrite a comma-delimited list of items to remove duplicates.
99 * @param[in,out] buffer Comma-delimited list.
100 * @return The input buffer \a buffer.
102 char* canonize(char* buffer
)
104 static char cbuf
[BUFSIZE
];
114 for (s
= ircd_strtok(&p
, buffer
, ","); s
; s
= ircd_strtok(&p
, NULL
, ","))
119 for (t
= ircd_strtok(&p2
, cbuf
, ","); t
; t
= ircd_strtok(&p2
, NULL
, ","))
120 if (0 == ircd_strcmp(s
, t
))
143 /** Copy one string to another, not to exceed a certain length.
144 * @param[in] s1 Output buffer.
145 * @param[in] s2 Source buffer.
146 * @param[in] n Maximum number of bytes to write, plus one.
147 * @return The original input buffer \a s1.
149 char* ircd_strncpy(char* s1
, const char* s2
, size_t n
)
157 while (s
< endp
&& (*s
++ = *s2
++))
164 NTL_HDR_strChattr
{ NTL_SRC_strChattr
}
165 NTL_HDR_strCasediff
{ NTL_SRC_strCasediff
}
166 #endif /* !FORCEINLINE */
169 * Other functions visible externally
172 /** Case insensitive string comparison.
173 * @param[in] a First string to compare.
174 * @param[in] b Second string to compare.
175 * @return Less than, equal to, or greater than zero if \a a is lexicographically less than, equal to, or greater than \a b.
177 int ircd_strcmp(const char *a
, const char *b
)
181 while (ToLower(*ra
) == ToLower(*rb
)) {
187 return (ToLower(*ra
) - ToLower(*rb
));
190 /** Case insensitive comparison of the starts of two strings.
191 * @param[in] a First string to compare.
192 * @param[in] b Second string to compare.
193 * @param[in] n Maximum number of characters to compare.
194 * @return Less than, equal to, or greater than zero if \a a is
195 * lexicographically less than, equal to, or greater than \a b.
197 int ircd_strncmp(const char *a
, const char *b
, size_t n
)
204 while (ToLower(*ra
) == ToLower(*rb
)) {
205 if (!*ra
++ || !left
--)
210 return (ToLower(*ra
) - ToLower(*rb
));
213 /** Fill a vector of distinct names from a delimited input list.
214 * Empty tokens (when \a token occurs at the start or end of \a list,
215 * or when \a token occurs adjacent to itself) are ignored. When
216 * \a size tokens have been written to \a vector, the rest of the
218 * Unlike token_vector(), if a token repeats an earlier token, it is
220 * @param[in,out] names Input buffer.
221 * @param[in] token Delimiter used to split \a list.
222 * @param[out] vector Output vector.
223 * @param[in] size Maximum number of elements to put in \a vector.
224 * @return Number of elements written to \a vector.
226 int unique_name_vector(char* names
, char token
, char** vector
, int size
)
238 * ignore spurious tokens
240 while (token
== *start
)
243 for (end
= strchr(start
, token
); end
; end
= strchr(start
, token
)) {
246 * ignore spurious tokens
248 while (token
== *end
)
250 for (i
= 0; i
< count
; ++i
) {
251 if (0 == ircd_strcmp(vector
[i
], start
))
255 vector
[count
++] = start
;
262 for (i
= 0; i
< count
; ++i
)
263 if (0 == ircd_strcmp(vector
[i
], start
))
265 vector
[count
++] = start
;
270 /** Fill a vector of tokens from a delimited input list.
271 * Empty tokens (when \a token occurs at the start or end of \a list,
272 * or when \a token occurs adjacent to itself) are ignored. When
273 * \a size tokens have been written to \a vector, the rest of the
275 * @param[in,out] names Input buffer.
276 * @param[in] token Delimiter used to split \a list.
277 * @param[out] vector Output vector.
278 * @param[in] size Maximum number of elements to put in \a vector.
279 * @return Number of elements written to \a vector.
281 int token_vector(char* names
, char token
, char** vector
, int size
)
291 vector
[count
++] = start
;
292 for (end
= strchr(start
, token
); end
; end
= strchr(start
, token
)) {
296 vector
[count
++] = start
;
305 /** Copy all or part of the hostname in a string to another string.
306 * If \a userhost contains an '\@', the remaining portion is used;
307 * otherwise, the whole \a userhost is used.
308 * @param[out] buf Output buffer.
309 * @param[in] userhost user\@hostname or hostname string.
310 * @param[in] len Maximum number of bytes to write to \a host.
311 * @return The output buffer \a buf.
313 char* host_from_uh(char* buf
, const char* userhost
, size_t len
)
318 assert(0 != userhost
);
320 if ((s
= strchr(userhost
, '@')))
324 ircd_strncpy(buf
, s
, len
);
330 * this new faster inet_ntoa was ripped from:
331 * From: Thomas Helvey <tomh@inxpress.net>
333 /** Array of text strings for dotted quads. */
334 static const char* IpQuadTab
[] =
336 "0", "1", "2", "3", "4", "5", "6", "7", "8", "9",
337 "10", "11", "12", "13", "14", "15", "16", "17", "18", "19",
338 "20", "21", "22", "23", "24", "25", "26", "27", "28", "29",
339 "30", "31", "32", "33", "34", "35", "36", "37", "38", "39",
340 "40", "41", "42", "43", "44", "45", "46", "47", "48", "49",
341 "50", "51", "52", "53", "54", "55", "56", "57", "58", "59",
342 "60", "61", "62", "63", "64", "65", "66", "67", "68", "69",
343 "70", "71", "72", "73", "74", "75", "76", "77", "78", "79",
344 "80", "81", "82", "83", "84", "85", "86", "87", "88", "89",
345 "90", "91", "92", "93", "94", "95", "96", "97", "98", "99",
346 "100", "101", "102", "103", "104", "105", "106", "107", "108", "109",
347 "110", "111", "112", "113", "114", "115", "116", "117", "118", "119",
348 "120", "121", "122", "123", "124", "125", "126", "127", "128", "129",
349 "130", "131", "132", "133", "134", "135", "136", "137", "138", "139",
350 "140", "141", "142", "143", "144", "145", "146", "147", "148", "149",
351 "150", "151", "152", "153", "154", "155", "156", "157", "158", "159",
352 "160", "161", "162", "163", "164", "165", "166", "167", "168", "169",
353 "170", "171", "172", "173", "174", "175", "176", "177", "178", "179",
354 "180", "181", "182", "183", "184", "185", "186", "187", "188", "189",
355 "190", "191", "192", "193", "194", "195", "196", "197", "198", "199",
356 "200", "201", "202", "203", "204", "205", "206", "207", "208", "209",
357 "210", "211", "212", "213", "214", "215", "216", "217", "218", "219",
358 "220", "221", "222", "223", "224", "225", "226", "227", "228", "229",
359 "230", "231", "232", "233", "234", "235", "236", "237", "238", "239",
360 "240", "241", "242", "243", "244", "245", "246", "247", "248", "249",
361 "250", "251", "252", "253", "254", "255"
364 /** Convert an IP address to printable ASCII form.
365 * This is generally deprecated in favor of ircd_ntoa_r().
366 * @param[in] in Address to convert.
367 * @return Pointer to a static buffer containing the readable form.
369 const char* ircd_ntoa(const struct irc_in_addr
* in
)
371 static char buf
[SOCKIPLEN
];
372 return ircd_ntoa_r(buf
, in
);
375 /** Convert an IP address to printable ASCII form.
376 * @param[out] buf Output buffer to write to.
377 * @param[in] in Address to format.
378 * @return Pointer to the output buffer \a buf.
380 const char* ircd_ntoa_r(char* buf
, const struct irc_in_addr
* in
)
385 if (irc_in_addr_is_ipv4(in
)) {
386 unsigned int pos
, len
;
389 pch
= (unsigned char*)&in
->in6_16
[6];
390 len
= strlen(IpQuadTab
[*pch
]);
391 memcpy(buf
, IpQuadTab
[*pch
++], len
);
394 len
= strlen(IpQuadTab
[*pch
]);
395 memcpy(buf
+pos
, IpQuadTab
[*pch
++], len
);
398 len
= strlen(IpQuadTab
[*pch
]);
399 memcpy(buf
+pos
, IpQuadTab
[*pch
++], len
);
402 len
= strlen(IpQuadTab
[*pch
]);
403 memcpy(buf
+pos
, IpQuadTab
[*pch
++], len
);
404 buf
[pos
+ len
] = '\0';
407 static const char hexdigits
[] = "0123456789abcdef";
408 unsigned int pos
, part
, max_start
, max_zeros
, curr_zeros
, ii
;
410 /* Find longest run of zeros. */
411 for (max_start
= ii
= 1, max_zeros
= curr_zeros
= 0; ii
< 8; ++ii
) {
414 else if (curr_zeros
> max_zeros
) {
415 max_start
= ii
- curr_zeros
;
416 max_zeros
= curr_zeros
;
420 if (curr_zeros
> max_zeros
) {
421 max_start
= ii
- curr_zeros
;
422 max_zeros
= curr_zeros
;
425 /* Print out address. */
426 /** Append \a CH to the output buffer. */
427 #define APPEND(CH) do { buf[pos++] = (CH); } while (0)
428 for (pos
= ii
= 0; (ii
< 8); ++ii
) {
429 if ((max_zeros
> 0) && (ii
== max_start
)) {
434 part
= ntohs(in
->in6_16
[ii
]);
436 APPEND(hexdigits
[part
>> 12]);
438 APPEND(hexdigits
[(part
>> 8) & 15]);
440 APPEND(hexdigits
[(part
>> 4) & 15]);
441 APPEND(hexdigits
[part
& 15]);
447 /* Nul terminate and return number of characters used. */
453 /** Attempt to parse an IPv4 address into a network-endian form.
454 * @param[in] input Input string.
455 * @param[out] output Network-endian representation of the address.
456 * @param[out] pbits Number of bits found in pbits.
457 * @return Number of characters used from \a input, or 0 if the parse failed.
460 ircd_aton_ip4(const char *input
, unsigned int *output
, unsigned char *pbits
)
462 unsigned int dots
= 0, pos
= 0, part
= 0, ip
= 0, bits
;
464 /* Intentionally no support for bizarre IPv4 formats (plain
465 * integers, octal or hex components) -- only vanilla dotted
471 while (1) switch (input
[pos
]) {
476 ip
|= part
<< (24 - 8 * dots
);
482 if (input
[++pos
] == '.')
484 ip
|= part
<< (24 - 8 * dots
++);
486 if (input
[pos
] == '*') {
487 while (input
[++pos
] == '*') ;
488 if (input
[pos
] != '\0')
497 if (!pbits
|| !IsDigit(input
[pos
+ 1]))
499 for (bits
= 0; IsDigit(input
[++pos
]); )
500 bits
= bits
* 10 + input
[pos
] - '0';
504 case '0': case '1': case '2': case '3': case '4':
505 case '5': case '6': case '7': case '8': case '9':
506 part
= part
* 10 + input
[pos
++] - '0';
515 /** Parse a numeric IPv4 or IPv6 address into an irc_in_addr.
516 * @param[in] input Input buffer.
517 * @param[out] ip Receives parsed IP address.
518 * @param[out] pbits If non-NULL, receives number of bits specified in address mask.
519 * @return Number of characters used from \a input, or 0 if the
520 * address was unparseable or malformed.
523 ipmask_parse(const char *input
, struct irc_in_addr
*ip
, unsigned char *pbits
)
530 memset(ip
, 0, sizeof(*ip
));
531 colon
= strchr(input
, ':');
532 dot
= strchr(input
, '.');
534 if (colon
&& (!dot
|| (dot
> colon
))) {
535 unsigned int part
= 0, pos
= 0, ii
= 0, colon
= 8;
536 const char *part_start
= NULL
;
538 /* Parse IPv6, possibly like ::127.0.0.1.
539 * This is pretty straightforward; the only trick is borrowed
540 * from Paul Vixie (BIND): when it sees a "::" continue as if
541 * it were a single ":", but note where it happened, and fill
542 * with zeros afterward.
544 if (input
[pos
] == ':') {
545 if ((input
[pos
+1] != ':') || (input
[pos
+2] == ':'))
549 part_start
= input
+ pos
;
551 while (ii
< 8) switch (input
[pos
]) {
553 case '0': case '1': case '2': case '3': case '4':
554 case '5': case '6': case '7': case '8': case '9':
555 chval
= input
[pos
] - '0';
557 part
= (part
<< 4) | chval
;
562 case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
563 chval
= input
[pos
] - 'A' + 10;
565 case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
566 chval
= input
[pos
] - 'a' + 10;
569 part_start
= input
+ ++pos
;
570 if (input
[pos
] == '.')
572 ip
->in6_16
[ii
++] = htons(part
);
574 if (input
[pos
] == ':') {
584 len
= ircd_aton_ip4(part_start
, &ip4
, pbits
);
585 if (!len
|| (ii
> 6))
587 ip
->in6_16
[ii
++] = htons(ntohl(ip4
) >> 16);
588 ip
->in6_16
[ii
++] = htons(ntohl(ip4
) & 65535);
591 pos
= part_start
+ len
- input
;
595 if (!pbits
|| !IsDigit(input
[pos
+ 1]))
597 ip
->in6_16
[ii
++] = htons(part
);
598 for (part
= 0; IsDigit(input
[++pos
]); )
599 part
= part
* 10 + input
[pos
] - '0';
605 while (input
[++pos
] == '*') ;
606 if (input
[pos
] != '\0' || colon
< 8)
612 ip
->in6_16
[ii
++] = htons(part
);
613 if (colon
== 8 && ii
< 8)
624 /* Shift stuff after "::" up and fill middle with zeros. */
625 for (jj
= 0; jj
< ii
- colon
; jj
++)
626 ip
->in6_16
[7 - jj
] = ip
->in6_16
[ii
- jj
- 1];
627 for (jj
= 0; jj
< 8 - ii
; jj
++)
628 ip
->in6_16
[colon
+ jj
] = 0;
631 } else if (dot
|| strchr(input
, '/')) {
633 int len
= ircd_aton_ip4(input
, &addr
, pbits
);
635 ip
->in6_16
[5] = htons(65535);
636 ip
->in6_16
[6] = htons(ntohl(addr
) >> 16);
637 ip
->in6_16
[7] = htons(ntohl(addr
) & 65535);
642 } else if (input
[0] == '*') {
643 unsigned int pos
= 0;
644 while (input
[++pos
] == '*') ;
645 if (input
[pos
] != '\0')
650 } else return 0; /* parse failed */