2 * Copyright Patrick Powell 1995
3 * This code is based on code written by Patrick Powell (papowell@astart.com)
4 * It may be used for any purpose as long as this notice remains intact
5 * on all source code distributions
8 /**************************************************************
10 * Patrick Powell Tue Apr 11 09:48:21 PDT 1995
11 * A bombproof version of doprnt (dopr) included.
12 * Sigh. This sort of thing is always nasty do deal with. Note that
13 * the version here does not include floating point...
15 * snprintf() is used instead of sprintf() as it does limit checks
16 * for string length. This covers a nasty loophole.
18 * The other functions are there to prevent NULL pointers from
19 * causing nast effects.
22 * Brandon Long <blong@fiction.net> 9/15/96 for mutt 0.43
23 * This was ugly. It is still ugly. I opted out of floating point
24 * numbers, but the formatter understands just about everything
25 * from the normal C string format, at least as far as I can tell from
26 * the Solaris 2.5 printf(3S) man page.
28 * Brandon Long <blong@fiction.net> 10/22/97 for mutt 0.87.1
29 * Ok, added some minimal floating point support, which means this
30 * probably requires libm on most operating systems. Don't yet
31 * support the exponent (e,E) and sigfig (g,G). Also, fmtint()
32 * was pretty badly broken, it just wasn't being exercised in ways
33 * which showed it, so that's been fixed. Also, formated the code
34 * to mutt conventions, and removed dead code left over from the
35 * original. Also, there is now a builtin-test, just compile with:
36 * gcc -DTEST_SNPRINTF -o snprintf snprintf.c -lm
37 * and run snprintf for results.
39 * Thomas Roessler <roessler@guug.de> 01/27/98 for mutt 0.89i
40 * The PGP code was using unsigned hexadecimal formats.
41 * Unfortunately, unsigned formats simply didn't work.
43 * Michael Elkins <me@cs.hmc.edu> 03/05/98 for mutt 0.90.8
44 * The original code assumed that both snprintf() and vsnprintf() were
45 * missing. Some systems only have snprintf() but not vsnprintf(), so
46 * the code is now broken down under HAVE_SNPRINTF and HAVE_VSNPRINTF.
48 * Ben Lindstrom <mouring@eviladmin.org> 09/27/00 for OpenSSH
49 * Welcome to the world of %lld and %qd support. With other
50 * long long support. This is needed for sftp-server to work
53 * Ben Lindstrom <mouring@eviladmin.org> 02/12/01 for OpenSSH
54 * Removed all hint of VARARGS stuff and banished it to the void,
55 * and did a bit of KNF style work to make things a bit more
56 * acceptable. Consider stealing from mutt or enlightenment.
57 **************************************************************/
61 RCSID("$Id: bsd-snprintf.c,v 1.9 2004/09/23 11:35:09 dtucker Exp $");
63 #if defined(BROKEN_SNPRINTF) /* For those with broken snprintf() */
65 # undef HAVE_VSNPRINTF
68 #if !defined(HAVE_SNPRINTF) || !defined(HAVE_VSNPRINTF)
71 dopr(char *buffer, size_t maxlen, const char *format, va_list args);
74 fmtstr(char *buffer, size_t *currlen, size_t maxlen, char *value, int flags,
78 fmtint(char *buffer, size_t *currlen, size_t maxlen, long value, int base,
79 int min, int max, int flags);
82 fmtfp(char *buffer, size_t *currlen, size_t maxlen, long double fvalue,
83 int min, int max, int flags);
86 dopr_outch(char *buffer, size_t *currlen, size_t maxlen, char c);
89 * dopr(): poor man's version of doprintf
92 /* format read states */
93 #define DP_S_DEFAULT 0
102 /* format flags - Bits */
103 #define DP_F_MINUS (1 << 0)
104 #define DP_F_PLUS (1 << 1)
105 #define DP_F_SPACE (1 << 2)
106 #define DP_F_NUM (1 << 3)
107 #define DP_F_ZERO (1 << 4)
108 #define DP_F_UP (1 << 5)
109 #define DP_F_UNSIGNED (1 << 6)
111 /* Conversion Flags */
114 #define DP_C_LDOUBLE 3
115 #define DP_C_LONG_LONG 4
117 #define char_to_int(p) (p - '0')
118 #define abs_val(p) (p < 0 ? -p : p)
122 dopr(char *buffer, size_t maxlen, const char *format, va_list args)
127 int min = 0, max = -1, state = DP_S_DEFAULT, flags = 0, cflags = 0;
132 while (state != DP_S_DONE) {
133 if ((ch == '\0') || (currlen >= maxlen))
141 dopr_outch(buffer, &currlen, maxlen, ch);
172 if (isdigit((unsigned char)ch)) {
173 min = 10 * min + char_to_int (ch);
175 } else if (ch == '*') {
176 min = va_arg (args, int);
190 if (isdigit((unsigned char)ch)) {
193 max = 10 * max + char_to_int(ch);
195 } else if (ch == '*') {
196 max = va_arg (args, int);
212 cflags = DP_C_LONG_LONG;
217 cflags = DP_C_LONG_LONG;
221 cflags = DP_C_LDOUBLE;
233 if (cflags == DP_C_SHORT)
234 value = va_arg(args, int);
235 else if (cflags == DP_C_LONG)
236 value = va_arg(args, long int);
237 else if (cflags == DP_C_LONG_LONG)
238 value = va_arg (args, long long);
240 value = va_arg (args, int);
241 fmtint(buffer, &currlen, maxlen, value, 10, min, max, flags);
244 flags |= DP_F_UNSIGNED;
245 if (cflags == DP_C_SHORT)
246 value = va_arg(args, unsigned int);
247 else if (cflags == DP_C_LONG)
248 value = va_arg(args, unsigned long int);
249 else if (cflags == DP_C_LONG_LONG)
250 value = va_arg(args, unsigned long long);
252 value = va_arg(args, unsigned int);
253 fmtint(buffer, &currlen, maxlen, value, 8, min, max, flags);
256 flags |= DP_F_UNSIGNED;
257 if (cflags == DP_C_SHORT)
258 value = va_arg(args, unsigned int);
259 else if (cflags == DP_C_LONG)
260 value = va_arg(args, unsigned long int);
261 else if (cflags == DP_C_LONG_LONG)
262 value = va_arg(args, unsigned long long);
264 value = va_arg(args, unsigned int);
265 fmtint (buffer, &currlen, maxlen, value, 10, min, max, flags);
270 flags |= DP_F_UNSIGNED;
271 if (cflags == DP_C_SHORT)
272 value = va_arg(args, unsigned int);
273 else if (cflags == DP_C_LONG)
274 value = va_arg(args, unsigned long int);
275 else if (cflags == DP_C_LONG_LONG)
276 value = va_arg(args, unsigned long long);
278 value = va_arg(args, unsigned int);
279 fmtint(buffer, &currlen, maxlen, value, 16, min, max, flags);
282 if (cflags == DP_C_LDOUBLE)
283 fvalue = va_arg(args, long double);
285 fvalue = va_arg(args, double);
286 /* um, floating point? */
287 fmtfp(buffer, &currlen, maxlen, fvalue, min, max, flags);
292 if (cflags == DP_C_LDOUBLE)
293 fvalue = va_arg(args, long double);
295 fvalue = va_arg(args, double);
300 if (cflags == DP_C_LDOUBLE)
301 fvalue = va_arg(args, long double);
303 fvalue = va_arg(args, double);
306 dopr_outch(buffer, &currlen, maxlen, va_arg(args, int));
309 strvalue = va_arg(args, char *);
311 max = maxlen; /* ie, no max */
312 fmtstr(buffer, &currlen, maxlen, strvalue, flags, min, max);
315 strvalue = va_arg(args, void *);
316 fmtint(buffer, &currlen, maxlen, (long) strvalue, 16, min, max, flags);
319 if (cflags == DP_C_SHORT) {
321 num = va_arg(args, short int *);
323 } else if (cflags == DP_C_LONG) {
325 num = va_arg(args, long int *);
327 } else if (cflags == DP_C_LONG_LONG) {
329 num = va_arg(args, long long *);
333 num = va_arg(args, int *);
338 dopr_outch(buffer, &currlen, maxlen, ch);
340 case 'w': /* not supported yet, treat as next char */
343 default: /* Unknown, skip */
347 state = DP_S_DEFAULT;
348 flags = cflags = min = 0;
354 break; /* some picky compilers need this */
357 if (currlen < maxlen - 1)
358 buffer[currlen] = '\0';
360 buffer[maxlen - 1] = '\0';
364 fmtstr(char *buffer, size_t *currlen, size_t maxlen,
365 char *value, int flags, int min, int max)
367 int cnt = 0, padlen, strln; /* amount to pad */
372 for (strln = 0; strln < max && value[strln]; ++strln); /* strlen */
373 padlen = min - strln;
376 if (flags & DP_F_MINUS)
377 padlen = -padlen; /* Left Justify */
379 while ((padlen > 0) && (cnt < max)) {
380 dopr_outch(buffer, currlen, maxlen, ' ');
384 while (*value && (cnt < max)) {
385 dopr_outch(buffer, currlen, maxlen, *value++);
388 while ((padlen < 0) && (cnt < max)) {
389 dopr_outch(buffer, currlen, maxlen, ' ');
395 /* Have to handle DP_F_NUM (ie 0x and 0 alternates) */
398 fmtint(char *buffer, size_t *currlen, size_t maxlen,
399 long value, int base, int min, int max, int flags)
401 unsigned long uvalue;
403 int signvalue = 0, place = 0, caps = 0;
404 int spadlen = 0; /* amount to space pad */
405 int zpadlen = 0; /* amount to zero pad */
412 if (!(flags & DP_F_UNSIGNED)) {
416 } else if (flags & DP_F_PLUS) /* Do a sign (+/i) */
418 else if (flags & DP_F_SPACE)
423 caps = 1; /* Should characters be upper case? */
426 (caps ? "0123456789ABCDEF" : "0123456789abcdef")
427 [uvalue % (unsigned)base];
428 uvalue = (uvalue / (unsigned)base );
429 } while (uvalue && (place < 20));
434 zpadlen = max - place;
435 spadlen = min - MAX (max, place) - (signvalue ? 1 : 0);
440 if (flags & DP_F_ZERO) {
441 zpadlen = MAX(zpadlen, spadlen);
444 if (flags & DP_F_MINUS)
445 spadlen = -spadlen; /* Left Justifty */
448 while (spadlen > 0) {
449 dopr_outch(buffer, currlen, maxlen, ' ');
455 dopr_outch(buffer, currlen, maxlen, signvalue);
459 while (zpadlen > 0) {
460 dopr_outch(buffer, currlen, maxlen, '0');
467 dopr_outch(buffer, currlen, maxlen, convert[--place]);
469 /* Left Justified spaces */
470 while (spadlen < 0) {
471 dopr_outch (buffer, currlen, maxlen, ' ');
479 long double result = 1;
490 round(long double value)
492 long intpart = value;
502 fmtfp(char *buffer, size_t *currlen, size_t maxlen, long double fvalue,
503 int min, int max, int flags)
505 char iconvert[20], fconvert[20];
506 int signvalue = 0, iplace = 0, fplace = 0;
507 int padlen = 0; /* amount to pad */
508 int zpadlen = 0, caps = 0;
509 long intpart, fracpart;
513 * AIX manpage says the default is 0, but Solaris says the default
514 * is 6, and sprintf on AIX defaults to 6
519 ufvalue = abs_val(fvalue);
523 else if (flags & DP_F_PLUS) /* Do a sign (+/i) */
525 else if (flags & DP_F_SPACE)
531 * Sorry, we only support 9 digits past the decimal because of our
537 /* We "cheat" by converting the fractional part to integer by
538 * multiplying by a factor of 10
540 fracpart = round((pow10 (max)) * (ufvalue - intpart));
542 if (fracpart >= pow10 (max)) {
544 fracpart -= pow10 (max);
547 /* Convert integer part */
550 (caps ? "0123456789ABCDEF" : "0123456789abcdef")
552 intpart = (intpart / 10);
553 } while(intpart && (iplace < 20));
556 iconvert[iplace] = 0;
558 /* Convert fractional part */
561 (caps ? "0123456789ABCDEF" : "0123456789abcdef")
563 fracpart = (fracpart / 10);
564 } while(fracpart && (fplace < 20));
567 fconvert[fplace] = 0;
569 /* -1 for decimal point, another -1 if we are printing a sign */
570 padlen = min - iplace - max - 1 - ((signvalue) ? 1 : 0);
571 zpadlen = max - fplace;
576 if (flags & DP_F_MINUS)
577 padlen = -padlen; /* Left Justifty */
579 if ((flags & DP_F_ZERO) && (padlen > 0)) {
581 dopr_outch(buffer, currlen, maxlen, signvalue);
586 dopr_outch(buffer, currlen, maxlen, '0');
591 dopr_outch(buffer, currlen, maxlen, ' ');
595 dopr_outch(buffer, currlen, maxlen, signvalue);
598 dopr_outch(buffer, currlen, maxlen, iconvert[--iplace]);
601 * Decimal point. This should probably use locale to find the
602 * correct char to print out.
604 dopr_outch(buffer, currlen, maxlen, '.');
607 dopr_outch(buffer, currlen, maxlen, fconvert[--fplace]);
609 while (zpadlen > 0) {
610 dopr_outch(buffer, currlen, maxlen, '0');
615 dopr_outch(buffer, currlen, maxlen, ' ');
621 dopr_outch(char *buffer, size_t *currlen, size_t maxlen, char c)
623 if (*currlen < maxlen)
624 buffer[(*currlen)++] = c;
626 #endif /* !defined(HAVE_SNPRINTF) || !defined(HAVE_VSNPRINTF) */
628 #ifndef HAVE_VSNPRINTF
630 vsnprintf(char *str, size_t count, const char *fmt, va_list args)
633 dopr(str, count, fmt, args);
637 #endif /* !HAVE_VSNPRINTF */
639 #ifndef HAVE_SNPRINTF
641 snprintf(char *str,size_t count,const char *fmt,...)
646 (void) vsnprintf(str, count, fmt, ap);
652 #endif /* !HAVE_SNPRINTF */