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1/**************************************************************
2 * Original:
3 * Patrick Powell Tue Apr 11 09:48:21 PDT 1995
4 * A bombproof version of doprnt (dopr) included.
5 * Sigh. This sort of thing is always nasty do deal with. Note that
6 * the version here does not include floating point...
7 *
8 * snprintf() is used instead of sprintf() as it does limit checks
9 * for string length. This covers a nasty loophole.
10 *
11 * The other functions are there to prevent NULL pointers from
12 * causing nast effects.
13 *
14 * More Recently:
15 * Brandon Long <blong@fiction.net> 9/15/96 for mutt 0.43
16 * This was ugly. It is still ugly. I opted out of floating point
17 * numbers, but the formatter understands just about everything
18 * from the normal C string format, at least as far as I can tell from
19 * the Solaris 2.5 printf(3S) man page.
20 *
21 * Brandon Long <blong@fiction.net> 10/22/97 for mutt 0.87.1
22 * Ok, added some minimal floating point support, which means this
23 * probably requires libm on most operating systems. Don't yet
24 * support the exponent (e,E) and sigfig (g,G). Also, fmtint()
25 * was pretty badly broken, it just wasn't being exercised in ways
26 * which showed it, so that's been fixed. Also, formated the code
27 * to mutt conventions, and removed dead code left over from the
28 * original. Also, there is now a builtin-test, just compile with:
29 * gcc -DTEST_SNPRINTF -o snprintf snprintf.c -lm
30 * and run snprintf for results.
31 *
32 * Thomas Roessler <roessler@guug.de> 01/27/98 for mutt 0.89i
33 * The PGP code was using unsigned hexadecimal formats.
34 * Unfortunately, unsigned formats simply didn't work.
35 *
36 * Michael Elkins <me@cs.hmc.edu> 03/05/98 for mutt 0.90.8
37 * The original code assumed that both snprintf() and vsnprintf() were
38 * missing. Some systems only have snprintf() but not vsnprintf(), so
39 * the code is now broken down under HAVE_SNPRINTF and HAVE_VSNPRINTF.
40 *
41 **************************************************************/
42
43#include "config.h"
44
45#if !defined(HAVE_SNPRINTF) || !defined(HAVE_VSNPRINTF)
46
47#include <string.h>
48# include <ctype.h>
49#include <sys/types.h>
50
51/* Define this as a fall through, HAVE_STDARG_H is probably already set */
52
53#define HAVE_VARARGS_H
54
55/* varargs declarations: */
56
57#if defined(HAVE_STDARG_H)
58# include <stdarg.h>
59# define HAVE_STDARGS /* let's hope that works everywhere (mj) */
60# define VA_LOCAL_DECL va_list ap
61# define VA_START(f) va_start(ap, f)
62# define VA_SHIFT(v,t) ; /* no-op for ANSI */
63# define VA_END va_end(ap)
64#else
65# if defined(HAVE_VARARGS_H)
66# include <varargs.h>
67# undef HAVE_STDARGS
68# define VA_LOCAL_DECL va_list ap
69# define VA_START(f) va_start(ap) /* f is ignored! */
70# define VA_SHIFT(v,t) v = va_arg(ap,t)
71# define VA_END va_end(ap)
72# else
73/*XX ** NO VARARGS ** XX*/
74# endif
75#endif
76
77/*int snprintf (char *str, size_t count, const char *fmt, ...);*/
78/*int vsnprintf (char *str, size_t count, const char *fmt, va_list arg);*/
79
80static void dopr (char *buffer, size_t maxlen, const char *format,
81 va_list args);
82static void fmtstr (char *buffer, size_t *currlen, size_t maxlen,
83 char *value, int flags, int min, int max);
84static void fmtint (char *buffer, size_t *currlen, size_t maxlen,
85 long value, int base, int min, int max, int flags);
86static void fmtfp (char *buffer, size_t *currlen, size_t maxlen,
87 long double fvalue, int min, int max, int flags);
88static void dopr_outch (char *buffer, size_t *currlen, size_t maxlen, char c );
89
90/*
91 * dopr(): poor man's version of doprintf
92 */
93
94/* format read states */
95#define DP_S_DEFAULT 0
96#define DP_S_FLAGS 1
97#define DP_S_MIN 2
98#define DP_S_DOT 3
99#define DP_S_MAX 4
100#define DP_S_MOD 5
101#define DP_S_CONV 6
102#define DP_S_DONE 7
103
104/* format flags - Bits */
105#define DP_F_MINUS (1 << 0)
106#define DP_F_PLUS (1 << 1)
107#define DP_F_SPACE (1 << 2)
108#define DP_F_NUM (1 << 3)
109#define DP_F_ZERO (1 << 4)
110#define DP_F_UP (1 << 5)
111#define DP_F_UNSIGNED (1 << 6)
112
113/* Conversion Flags */
114#define DP_C_SHORT 1
115#define DP_C_LONG 2
116#define DP_C_LDOUBLE 3
117
118#define char_to_int(p) (p - '0')
119#define MAX(p,q) ((p >= q) ? p : q)
120
121static void dopr (char *buffer, size_t maxlen, const char *format, va_list args)
122{
123 char ch;
124 long value;
125 long double fvalue;
126 char *strvalue;
127 int min;
128 int max;
129 int state;
130 int flags;
131 int cflags;
132 size_t currlen;
133
134 state = DP_S_DEFAULT;
135 currlen = flags = cflags = min = 0;
136 max = -1;
137 ch = *format++;
138
139 while (state != DP_S_DONE)
140 {
141 if ((ch == '\0') || (currlen >= maxlen))
142 state = DP_S_DONE;
143
144 switch(state)
145 {
146 case DP_S_DEFAULT:
147 if (ch == '%')
148 state = DP_S_FLAGS;
149 else
150 dopr_outch (buffer, &currlen, maxlen, ch);
151 ch = *format++;
152 break;
153 case DP_S_FLAGS:
154 switch (ch)
155 {
156 case '-':
157 flags |= DP_F_MINUS;
158 ch = *format++;
159 break;
160 case '+':
161 flags |= DP_F_PLUS;
162 ch = *format++;
163 break;
164 case ' ':
165 flags |= DP_F_SPACE;
166 ch = *format++;
167 break;
168 case '#':
169 flags |= DP_F_NUM;
170 ch = *format++;
171 break;
172 case '0':
173 flags |= DP_F_ZERO;
174 ch = *format++;
175 break;
176 default:
177 state = DP_S_MIN;
178 break;
179 }
180 break;
181 case DP_S_MIN:
182 if (isdigit((unsigned char)ch))
183 {
184 min = 10*min + char_to_int (ch);
185 ch = *format++;
186 }
187 else if (ch == '*')
188 {
189 min = va_arg (args, int);
190 ch = *format++;
191 state = DP_S_DOT;
192 }
193 else
194 state = DP_S_DOT;
195 break;
196 case DP_S_DOT:
197 if (ch == '.')
198 {
199 state = DP_S_MAX;
200 ch = *format++;
201 }
202 else
203 state = DP_S_MOD;
204 break;
205 case DP_S_MAX:
206 if (isdigit((unsigned char)ch))
207 {
208 if (max < 0)
209 max = 0;
210 max = 10*max + char_to_int (ch);
211 ch = *format++;
212 }
213 else if (ch == '*')
214 {
215 max = va_arg (args, int);
216 ch = *format++;
217 state = DP_S_MOD;
218 }
219 else
220 state = DP_S_MOD;
221 break;
222 case DP_S_MOD:
223 /* Currently, we don't support Long Long, bummer */
224 switch (ch)
225 {
226 case 'h':
227 cflags = DP_C_SHORT;
228 ch = *format++;
229 break;
230 case 'l':
231 cflags = DP_C_LONG;
232 ch = *format++;
233 break;
234 case 'L':
235 cflags = DP_C_LDOUBLE;
236 ch = *format++;
237 break;
238 default:
239 break;
240 }
241 state = DP_S_CONV;
242 break;
243 case DP_S_CONV:
244 switch (ch)
245 {
246 case 'd':
247 case 'i':
248 if (cflags == DP_C_SHORT)
249 value = va_arg (args, short int);
250 else if (cflags == DP_C_LONG)
251 value = va_arg (args, long int);
252 else
253 value = va_arg (args, int);
254 fmtint (buffer, &currlen, maxlen, value, 10, min, max, flags);
255 break;
256 case 'o':
257 flags |= DP_F_UNSIGNED;
258 if (cflags == DP_C_SHORT)
259 value = va_arg (args, unsigned short int);
260 else if (cflags == DP_C_LONG)
261 value = va_arg (args, unsigned long int);
262 else
263 value = va_arg (args, unsigned int);
264 fmtint (buffer, &currlen, maxlen, value, 8, min, max, flags);
265 break;
266 case 'u':
267 flags |= DP_F_UNSIGNED;
268 if (cflags == DP_C_SHORT)
269 value = va_arg (args, unsigned short int);
270 else if (cflags == DP_C_LONG)
271 value = va_arg (args, unsigned long int);
272 else
273 value = va_arg (args, unsigned int);
274 fmtint (buffer, &currlen, maxlen, value, 10, min, max, flags);
275 break;
276 case 'X':
277 flags |= DP_F_UP;
278 case 'x':
279 flags |= DP_F_UNSIGNED;
280 if (cflags == DP_C_SHORT)
281 value = va_arg (args, unsigned short int);
282 else if (cflags == DP_C_LONG)
283 value = va_arg (args, unsigned long int);
284 else
285 value = va_arg (args, unsigned int);
286 fmtint (buffer, &currlen, maxlen, value, 16, min, max, flags);
287 break;
288 case 'f':
289 if (cflags == DP_C_LDOUBLE)
290 fvalue = va_arg (args, long double);
291 else
292 fvalue = va_arg (args, double);
293 /* um, floating point? */
294 fmtfp (buffer, &currlen, maxlen, fvalue, min, max, flags);
295 break;
296 case 'E':
297 flags |= DP_F_UP;
298 case 'e':
299 if (cflags == DP_C_LDOUBLE)
300 fvalue = va_arg (args, long double);
301 else
302 fvalue = va_arg (args, double);
303 break;
304 case 'G':
305 flags |= DP_F_UP;
306 case 'g':
307 if (cflags == DP_C_LDOUBLE)
308 fvalue = va_arg (args, long double);
309 else
310 fvalue = va_arg (args, double);
311 break;
312 case 'c':
313 dopr_outch (buffer, &currlen, maxlen, va_arg (args, int));
314 break;
315 case 's':
316 strvalue = va_arg (args, char *);
317 if (max < 0)
318 max = maxlen; /* ie, no max */
319 fmtstr (buffer, &currlen, maxlen, strvalue, flags, min, max);
320 break;
321 case 'p':
322 strvalue = va_arg (args, void *);
323 fmtint (buffer, &currlen, maxlen, (long) strvalue, 16, min, max, flags);
324 break;
325 case 'n':
326 if (cflags == DP_C_SHORT)
327 {
328 short int *num;
329 num = va_arg (args, short int *);
330 *num = currlen;
331 }
332 else if (cflags == DP_C_LONG)
333 {
334 long int *num;
335 num = va_arg (args, long int *);
336 *num = currlen;
337 }
338 else
339 {
340 int *num;
341 num = va_arg (args, int *);
342 *num = currlen;
343 }
344 break;
345 case '%':
346 dopr_outch (buffer, &currlen, maxlen, ch);
347 break;
348 case 'w':
349 /* not supported yet, treat as next char */
350 ch = *format++;
351 break;
352 default:
353 /* Unknown, skip */
354 break;
355 }
356 ch = *format++;
357 state = DP_S_DEFAULT;
358 flags = cflags = min = 0;
359 max = -1;
360 break;
361 case DP_S_DONE:
362 break;
363 default:
364 /* hmm? */
365 break; /* some picky compilers need this */
366 }
367 }
368 if (currlen < maxlen - 1)
369 buffer[currlen] = '\0';
370 else
371 buffer[maxlen - 1] = '\0';
372}
373
374static void fmtstr (char *buffer, size_t *currlen, size_t maxlen,
375 char *value, int flags, int min, int max)
376{
377 int padlen, strln; /* amount to pad */
378 int cnt = 0;
379
380 if (value == 0)
381 {
382 value = "<NULL>";
383 }
384
385 for (strln = 0; value[strln]; ++strln); /* strlen */
386 padlen = min - strln;
387 if (padlen < 0)
388 padlen = 0;
389 if (flags & DP_F_MINUS)
390 padlen = -padlen; /* Left Justify */
391
392 while ((padlen > 0) && (cnt < max))
393 {
394 dopr_outch (buffer, currlen, maxlen, ' ');
395 --padlen;
396 ++cnt;
397 }
398 while (*value && (cnt < max))
399 {
400 dopr_outch (buffer, currlen, maxlen, *value++);
401 ++cnt;
402 }
403 while ((padlen < 0) && (cnt < max))
404 {
405 dopr_outch (buffer, currlen, maxlen, ' ');
406 ++padlen;
407 ++cnt;
408 }
409}
410
411/* Have to handle DP_F_NUM (ie 0x and 0 alternates) */
412
413static void fmtint (char *buffer, size_t *currlen, size_t maxlen,
414 long value, int base, int min, int max, int flags)
415{
416 int signvalue = 0;
417 unsigned long uvalue;
418 char convert[20];
419 int place = 0;
420 int spadlen = 0; /* amount to space pad */
421 int zpadlen = 0; /* amount to zero pad */
422 int caps = 0;
423
424 if (max < 0)
425 max = 0;
426
427 uvalue = value;
428
429 if(!(flags & DP_F_UNSIGNED))
430 {
431 if( value < 0 ) {
432 signvalue = '-';
433 uvalue = -value;
434 }
435 else
436 if (flags & DP_F_PLUS) /* Do a sign (+/i) */
437 signvalue = '+';
438 else
439 if (flags & DP_F_SPACE)
440 signvalue = ' ';
441 }
442
443 if (flags & DP_F_UP) caps = 1; /* Should characters be upper case? */
444
445 do {
446 convert[place++] =
447 (caps? "0123456789ABCDEF":"0123456789abcdef")
448 [uvalue % (unsigned)base ];
449 uvalue = (uvalue / (unsigned)base );
450 } while(uvalue && (place < 20));
451 if (place == 20) place--;
452 convert[place] = 0;
453
454 zpadlen = max - place;
455 spadlen = min - MAX (max, place) - (signvalue ? 1 : 0);
456 if (zpadlen < 0) zpadlen = 0;
457 if (spadlen < 0) spadlen = 0;
458 if (flags & DP_F_ZERO)
459 {
460 zpadlen = MAX(zpadlen, spadlen);
461 spadlen = 0;
462 }
463 if (flags & DP_F_MINUS)
464 spadlen = -spadlen; /* Left Justifty */
465
466#ifdef DEBUG_SNPRINTF
467 dprint (1, (debugfile, "zpad: %d, spad: %d, min: %d, max: %d, place: %d\n",
468 zpadlen, spadlen, min, max, place));
469#endif
470
471 /* Spaces */
472 while (spadlen > 0)
473 {
474 dopr_outch (buffer, currlen, maxlen, ' ');
475 --spadlen;
476 }
477
478 /* Sign */
479 if (signvalue)
480 dopr_outch (buffer, currlen, maxlen, signvalue);
481
482 /* Zeros */
483 if (zpadlen > 0)
484 {
485 while (zpadlen > 0)
486 {
487 dopr_outch (buffer, currlen, maxlen, '0');
488 --zpadlen;
489 }
490 }
491
492 /* Digits */
493 while (place > 0)
494 dopr_outch (buffer, currlen, maxlen, convert[--place]);
495
496 /* Left Justified spaces */
497 while (spadlen < 0) {
498 dopr_outch (buffer, currlen, maxlen, ' ');
499 ++spadlen;
500 }
501}
502
503static long double abs_val (long double value)
504{
505 long double result = value;
506
507 if (value < 0)
508 result = -value;
509
510 return result;
511}
512
513static long double pow10 (int exp)
514{
515 long double result = 1;
516
517 while (exp)
518 {
519 result *= 10;
520 exp--;
521 }
522
523 return result;
524}
525
526static long round (long double value)
527{
528 long intpart;
529
530 intpart = value;
531 value = value - intpart;
532 if (value >= 0.5)
533 intpart++;
534
535 return intpart;
536}
537
538static void fmtfp (char *buffer, size_t *currlen, size_t maxlen,
539 long double fvalue, int min, int max, int flags)
540{
541 int signvalue = 0;
542 long double ufvalue;
543 char iconvert[20];
544 char fconvert[20];
545 int iplace = 0;
546 int fplace = 0;
547 int padlen = 0; /* amount to pad */
548 int zpadlen = 0;
549 int caps = 0;
550 long intpart;
551 long fracpart;
552
553 /*
554 * AIX manpage says the default is 0, but Solaris says the default
555 * is 6, and sprintf on AIX defaults to 6
556 */
557 if (max < 0)
558 max = 6;
559
560 ufvalue = abs_val (fvalue);
561
562 if (fvalue < 0)
563 signvalue = '-';
564 else
565 if (flags & DP_F_PLUS) /* Do a sign (+/i) */
566 signvalue = '+';
567 else
568 if (flags & DP_F_SPACE)
569 signvalue = ' ';
570
571#if 0
572 if (flags & DP_F_UP) caps = 1; /* Should characters be upper case? */
573#endif
574
575 intpart = ufvalue;
576
577 /*
578 * Sorry, we only support 9 digits past the decimal because of our
579 * conversion method
580 */
581 if (max > 9)
582 max = 9;
583
584 /* We "cheat" by converting the fractional part to integer by
585 * multiplying by a factor of 10
586 */
587 fracpart = round ((pow10 (max)) * (ufvalue - intpart));
588
589 if (fracpart >= pow10 (max))
590 {
591 intpart++;
592 fracpart -= pow10 (max);
593 }
594
595#ifdef DEBUG_SNPRINTF
596 dprint (1, (debugfile, "fmtfp: %f =? %d.%d\n", fvalue, intpart, fracpart));
597#endif
598
599 /* Convert integer part */
600 do {
601 iconvert[iplace++] =
602 (caps? "0123456789ABCDEF":"0123456789abcdef")[intpart % 10];
603 intpart = (intpart / 10);
604 } while(intpart && (iplace < 20));
605 if (iplace == 20) iplace--;
606 iconvert[iplace] = 0;
607
608 /* Convert fractional part */
609 do {
610 fconvert[fplace++] =
611 (caps? "0123456789ABCDEF":"0123456789abcdef")[fracpart % 10];
612 fracpart = (fracpart / 10);
613 } while(fracpart && (fplace < 20));
614 if (fplace == 20) fplace--;
615 fconvert[fplace] = 0;
616
617 /* -1 for decimal point, another -1 if we are printing a sign */
618 padlen = min - iplace - max - 1 - ((signvalue) ? 1 : 0);
619 zpadlen = max - fplace;
620 if (zpadlen < 0)
621 zpadlen = 0;
622 if (padlen < 0)
623 padlen = 0;
624 if (flags & DP_F_MINUS)
625 padlen = -padlen; /* Left Justifty */
626
627 if ((flags & DP_F_ZERO) && (padlen > 0))
628 {
629 if (signvalue)
630 {
631 dopr_outch (buffer, currlen, maxlen, signvalue);
632 --padlen;
633 signvalue = 0;
634 }
635 while (padlen > 0)
636 {
637 dopr_outch (buffer, currlen, maxlen, '0');
638 --padlen;
639 }
640 }
641 while (padlen > 0)
642 {
643 dopr_outch (buffer, currlen, maxlen, ' ');
644 --padlen;
645 }
646 if (signvalue)
647 dopr_outch (buffer, currlen, maxlen, signvalue);
648
649 while (iplace > 0)
650 dopr_outch (buffer, currlen, maxlen, iconvert[--iplace]);
651
652 /*
653 * Decimal point. This should probably use locale to find the correct
654 * char to print out.
655 */
656 dopr_outch (buffer, currlen, maxlen, '.');
657
658 while (fplace > 0)
659 dopr_outch (buffer, currlen, maxlen, fconvert[--fplace]);
660
661 while (zpadlen > 0)
662 {
663 dopr_outch (buffer, currlen, maxlen, '0');
664 --zpadlen;
665 }
666
667 while (padlen < 0)
668 {
669 dopr_outch (buffer, currlen, maxlen, ' ');
670 ++padlen;
671 }
672}
673
674static void dopr_outch (char *buffer, size_t *currlen, size_t maxlen, char c)
675{
676 if (*currlen < maxlen)
677 buffer[(*currlen)++] = c;
678}
679#endif /* !defined(HAVE_SNPRINTF) || !defined(HAVE_VSNPRINTF) */
680
681#ifndef HAVE_VSNPRINTF
682int vsnprintf (char *str, size_t count, const char *fmt, va_list args)
683{
684 str[0] = 0;
685 dopr(str, count, fmt, args);
686 return(strlen(str));
687}
688#endif /* !HAVE_VSNPRINTF */
689
690#ifndef HAVE_SNPRINTF
691/* VARARGS3 */
692#ifdef HAVE_STDARGS
693int snprintf (char *str,size_t count,const char *fmt,...)
694#else
695int snprintf (va_alist) va_dcl
696#endif
697{
698#ifndef HAVE_STDARGS
699 char *str;
700 size_t count;
701 char *fmt;
702#endif
703 VA_LOCAL_DECL;
704
705 VA_START (fmt);
706 VA_SHIFT (str, char *);
707 VA_SHIFT (count, size_t );
708 VA_SHIFT (fmt, char *);
709 (void) vsnprintf(str, count, fmt, ap);
710 VA_END;
711 return(strlen(str));
712}
713
714#ifdef TEST_SNPRINTF
715#ifndef LONG_STRING
716#define LONG_STRING 1024
717#endif
718int main (void)
719{
720 char buf1[LONG_STRING];
721 char buf2[LONG_STRING];
722 char *fp_fmt[] = {
723 "%-1.5f",
724 "%1.5f",
725 "%123.9f",
726 "%10.5f",
727 "% 10.5f",
728 "%+22.9f",
729 "%+4.9f",
730 "%01.3f",
731 "%4f",
732 "%3.1f",
733 "%3.2f",
734 NULL
735 };
736 double fp_nums[] = { -1.5, 134.21, 91340.2, 341.1234, 0203.9, 0.96, 0.996,
737 0.9996, 1.996, 4.136, 0};
738 char *int_fmt[] = {
739 "%-1.5d",
740 "%1.5d",
741 "%123.9d",
742 "%5.5d",
743 "%10.5d",
744 "% 10.5d",
745 "%+22.33d",
746 "%01.3d",
747 "%4d",
748 NULL
749 };
750 long int_nums[] = { -1, 134, 91340, 341, 0203, 0};
751 int x, y;
752 int fail = 0;
753 int num = 0;
754
755 printf ("Testing snprintf format codes against system sprintf...\n");
756
757 for (x = 0; fp_fmt[x] != NULL ; x++)
758 for (y = 0; fp_nums[y] != 0 ; y++)
759 {
760 snprintf (buf1, sizeof (buf1), fp_fmt[x], fp_nums[y]);
761 sprintf (buf2, fp_fmt[x], fp_nums[y]);
762 if (strcmp (buf1, buf2))
763 {
764 printf("snprintf doesn't match Format: %s\n\tsnprintf = %s\n\tsprintf = %s\n",
765 fp_fmt[x], buf1, buf2);
766 fail++;
767 }
768 num++;
769 }
770
771 for (x = 0; int_fmt[x] != NULL ; x++)
772 for (y = 0; int_nums[y] != 0 ; y++)
773 {
774 snprintf (buf1, sizeof (buf1), int_fmt[x], int_nums[y]);
775 sprintf (buf2, int_fmt[x], int_nums[y]);
776 if (strcmp (buf1, buf2))
777 {
778 printf("snprintf doesn't match Format: %s\n\tsnprintf = %s\n\tsprintf = %s\n",
779 int_fmt[x], buf1, buf2);
780 fail++;
781 }
782 num++;
783 }
784 printf ("%d tests failed out of %d.\n", fail, num);
785}
786#endif /* SNPRINTF_TEST */
787
788#endif /* !HAVE_SNPRINTF */