4 * Utility functions that are used by both the client and server.
18 #if TIME_WITH_SYS_TIME
19 # include <sys/time.h>
23 # include <sys/time.h>
35 extern int err_printf(char *fmt, ...);
41 typedef unsigned char byte; /* Byte type */
42 static byte dtable[256]; /* base64 encode / decode table */
45 char *safestrncpy(char *dest, const char *src, size_t n)
47 if (dest == NULL || src == NULL) {
48 err_printf("safestrncpy: NULL argument\n");
51 strncpy(dest, src, n);
58 #ifndef HAVE_STRNCASECMP
59 int strncasecmp(char *lstr, char *rstr, int len)
64 lc=tolower(lstr[pos]);
65 rc=tolower(rstr[pos]);
66 if ((lc==0)&&(rc==0)) return(0);
67 if (lc<rc) return(-1);
78 * num_tokens() - discover number of parameters/tokens in a string
80 int num_tokens(char *source, char tok) {
84 if (source == NULL) return(0);
85 for (a=0; a<strlen(source); ++a) {
86 if (source[a]==tok) ++count;
92 * extract_token() - a smarter string tokenizer
94 void extract_token(char *dest, char *source, int parmnum, char separator)
104 if (strlen(source)==0) {
108 for (i=0; i<strlen(source); ++i) {
109 if (source[i]==separator) {
112 else if (curr_parm == parmnum) {
114 dest[len++] = source[i];
122 * remove_token() - a tokenizer that kills, maims, and destroys
124 void remove_token(char *source, int parmnum, char separator)
136 if (strlen(source)==0) {
140 for (i=0; i<strlen(source); ++i) {
141 if ( (start < 0) && (curr_parm == parmnum) ) {
145 if ( (end < 0) && (curr_parm == (parmnum+1)) ) {
149 if (source[i]==separator) {
154 if (end < 0) end = strlen(source);
155 strcpy(&source[start], &source[end]);
162 * extract_int() - extract an int parm w/o supplying a buffer
164 int extract_int(char *source, int parmnum)
168 extract_token(buf, source, parmnum, '|');
173 * extract_long() - extract an long parm w/o supplying a buffer
175 long extract_long(char *source, long int parmnum)
179 extract_token(buf, source, parmnum, '|');
186 * decode_base64() and encode_base64() are adaptations of code by
187 * John Walker, found in full in the file "base64.c" included with this
188 * distribution. The difference between those functions and these is that
189 * these are intended to encode/decode small string buffers, and those are
190 * intended to encode/decode entire MIME parts.
193 void encode_base64(char *dest, char *source)
195 int i, hiteof = FALSE;
199 /* Fill dtable with character encodings. */
201 for (i = 0; i < 26; i++) {
203 dtable[26 + i] = 'a' + i;
205 for (i = 0; i < 10; i++) {
206 dtable[52 + i] = '0' + i;
212 byte igroup[3], ogroup[4];
215 igroup[0] = igroup[1] = igroup[2] = 0;
216 for (n = 0; n < 3; n++) {
222 igroup[n] = (byte) c;
225 ogroup[0] = dtable[igroup[0] >> 2];
226 ogroup[1] = dtable[((igroup[0] & 3) << 4) | (igroup[1] >> 4)];
227 ogroup[2] = dtable[((igroup[1] & 0xF) << 2) | (igroup[2] >> 6)];
228 ogroup[3] = dtable[igroup[2] & 0x3F];
230 /* Replace characters in output stream with "=" pad
231 characters if fewer than three characters were
232 read from the end of the input stream. */
240 for (i = 0; i < 4; i++) {
241 dest[dpos++] = ogroup[i];
250 * Convert base64-encoded to binary. Returns the length of the decoded data.
251 * It will stop after reading 'length' bytes.
253 int decode_base64(char *dest, char *source, size_t length)
259 for (i = 0; i < 255; i++) {
262 for (i = 'A'; i <= 'Z'; i++) {
263 dtable[i] = 0 + (i - 'A');
265 for (i = 'a'; i <= 'z'; i++) {
266 dtable[i] = 26 + (i - 'a');
268 for (i = '0'; i <= '9'; i++) {
269 dtable[i] = 52 + (i - '0');
275 /*CONSTANTCONDITION*/
277 byte a[4], b[4], o[3];
279 for (i = 0; i < 4; i++) {
280 if (spos >= length) {
291 if (dtable[c] & 0x80) {
292 /* Ignoring errors: discard invalid character. */
297 b[i] = (byte) dtable[c];
299 o[0] = (b[0] << 2) | (b[1] >> 4);
300 o[1] = (b[1] << 4) | (b[2] >> 2);
301 o[2] = (b[2] << 6) | b[3];
302 i = a[2] == '=' ? 1 : (a[3] == '=' ? 2 : 3);
303 if (i>=1) dest[dpos++] = o[0];
304 if (i>=2) dest[dpos++] = o[1];
305 if (i>=3) dest[dpos++] = o[2];
316 * Strip leading and trailing spaces from a string
318 void striplt(char *buf)
320 while ((strlen(buf) > 0) && (isspace(buf[0])))
321 strcpy(buf, &buf[1]);
322 while (isspace(buf[strlen(buf) - 1]))
323 buf[strlen(buf) - 1] = 0;
331 * Return the number of occurances of character ch in string st
333 int haschar(char *st, int ch)
337 for (a = 0; a < strlen(st); ++a)
347 * Compare two strings, insensitive to case, punctuation, and non-alnum chars
349 int collapsed_strcmp(char *s1, char *s2) {
353 c1 = malloc(strlen(s1)+1);
354 c2 = malloc(strlen(s2)+1);
359 for (i=0; i<strlen(s1); ++i) {
360 if (isalnum(s1[i])) {
361 c1[pos] = tolower(s1[i]);
367 for (i=0; i<strlen(s2); ++i) {
368 if (isalnum(s2[i])) {
369 c2[pos] = tolower(s2[i]);
374 ret = strcmp(c1, c2);
383 * Format a date/time stamp for output
384 * seconds is whether to print the seconds
386 void fmt_date(char *buf, time_t thetime, int seconds) {
390 char *ascmonths[] = {
391 "Jan", "Feb", "Mar", "Apr", "May", "Jun",
392 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
396 tm = localtime(&thetime);
399 if (hour == 0) hour = 12;
400 else if (hour > 12) hour = hour - 12;
403 sprintf(buf, "%s %d %4d %d:%02d:%02d%s",
404 ascmonths[tm->tm_mon],
410 ( (tm->tm_hour >= 12) ? "pm" : "am" )
413 sprintf(buf, "%s %d %4d %d:%02d%s",
414 ascmonths[tm->tm_mon],
419 ( (tm->tm_hour >= 12) ? "pm" : "am" )
427 * Determine whether the specified message number is contained within the
430 int is_msg_in_mset(char *mset, long msgnum) {
433 char setstr[SIZ], lostr[SIZ], histr[SIZ]; /* was 1024 */
437 * Now set it for all specified messages.
439 num_sets = num_tokens(mset, ',');
440 for (s=0; s<num_sets; ++s) {
441 extract_token(setstr, mset, s, ',');
443 extract_token(lostr, setstr, 0, ':');
444 if (num_tokens(setstr, ':') >= 2) {
445 extract_token(histr, setstr, 1, ':');
446 if (!strcmp(histr, "*")) {
447 sprintf(histr, "%ld", LONG_MAX);
451 strcpy(histr, lostr);
456 if ((msgnum >= lo) && (msgnum <= hi)) return(1);
464 * Utility function to "readline" from memory
465 * (returns new pointer)
467 char *memreadline(char *start, char *buf, int maxlen)
471 int len = 0; /* tally our own length to avoid strlen() delays */
474 memset(buf, 0, maxlen);
478 if ( (len < (maxlen - 1)) && (ch != 13) && (ch != 10) ) {
479 buf[strlen(buf) + 1] = 0;
480 buf[strlen(buf)] = ch;
483 if ((ch == 10) || (ch == 0)) {
491 * Strip a boundarized substring out of a string (for example, remove
492 * parentheses and anything inside them).
494 void stripout(char *str, char leftboundary, char rightboundary) {
499 for (a = 0; a < strlen(str); ++a) {
500 if (str[a] == leftboundary) lb = a;
501 if (str[a] == rightboundary) rb = a;
504 if ( (lb > 0) && (rb > lb) ) {
505 strcpy(&str[lb - 1], &str[rb + 1]);
512 * Reduce a string down to a boundarized substring (for example, remove
513 * parentheses and anything outside them).
515 void stripallbut(char *str, char leftboundary, char rightboundary) {
518 for (a = 0; a < strlen(str); ++ a) {
519 if (str[a] == leftboundary) strcpy(str, &str[a+1]);
522 for (a = 0; a < strlen(str); ++ a) {
523 if (str[a] == rightboundary) str[a] = 0;