1/* snprintf - compatibility implementation of snprintf, vsnprintf
2 *
3 * Copyright (c) 2013, NLnet Labs. All rights reserved.
4 *
5 * This software is open source.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * Redistributions of source code must retain the above copyright notice,
12 * this list of conditions and the following disclaimer.
13 *
14 * Redistributions in binary form must reproduce the above copyright notice,
15 * this list of conditions and the following disclaimer in the documentation
16 * and/or other materials provided with the distribution.
17 *
18 * Neither the name of the NLNET LABS nor the names of its contributors may
19 * be used to endorse or promote products derived from this software without
20 * specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
25 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
26 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
27 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
28 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
29 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
30 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
31 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
32 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 */
34
35#include "config.h"
36#include <stdio.h>
37#include <ctype.h>
38#include <string.h>
39#include <stdarg.h>
40#include <stdlib.h>
41#include <errno.h>
42#ifdef HAVE_STDINT_H
43#include <stdint.h>
44#endif
45
46/* for test */
47/* #define SNPRINTF_TEST 1 */
48#ifdef SNPRINTF_TEST
49#define snprintf my_snprintf
50#define vsnprintf my_vsnprintf
51#endif /* SNPRINTF_TEST */
52
53int snprintf(char* str, size_t size, const char* format, ...);
54int vsnprintf(char* str, size_t size, const char* format, va_list arg);
55
56/**
57 * Very portable snprintf implementation, limited in functionality,
58 * esp. for %[capital] %[nonportable] and so on. Reduced float functionality,
59 * mostly in formatting and range (e+-16), for %f and %g.
60 *
61 * %s, %d, %u, %i, %x, %c, %n and %% are fully supported.
62 * This includes width, precision, flags 0- +, and *(arg for wid,prec).
63 * %f, %g, %m, %p have reduced support, support for wid,prec,flags,*, but
64 * less floating point range, no %e formatting for %g.
65 */
66int snprintf(char* str, size_t size, const char* format, ...)
67{
68 int r;
69 va_list args;
70 va_start(args, format);
71 r = vsnprintf(str, size, format, args);
72 va_end(args);
73 return r;
74}
75
76/** add padding to string */
77static void
78print_pad(char** at, size_t* left, int* ret, char p, int num)
79{
80 while(num--) {
81 if(*left > 1) {
82 *(*at)++ = p;
83 (*left)--;
84 }
85 (*ret)++;
86 }
87}
88
89/** get negative symbol, 0 if none */
90static char
91get_negsign(int negative, int plus, int space)
92{
93 if(negative)
94 return '-';
95 if(plus)
96 return '+';
97 if(space)
98 return ' ';
99 return 0;
100}
101
102#define PRINT_DEC_BUFSZ 32 /* 20 is enough for 64 bit decimals */
103/** print decimal into buffer, returns length */
104static int
105print_dec(char* buf, int max, unsigned int value)
106{
107 int i = 0;
108 if(value == 0) {
109 if(max > 0) {
110 buf[0] = '0';
111 i = 1;
112 }
113 } else while(value && i < max) {
114 buf[i++] = '0' + value % 10;
115 value /= 10;
116 }
117 return i;
118}
119
120/** print long decimal into buffer, returns length */
121static int
122print_dec_l(char* buf, int max, unsigned long value)
123{
124 int i = 0;
125 if(value == 0) {
126 if(max > 0) {
127 buf[0] = '0';
128 i = 1;
129 }
130 } else while(value && i < max) {
131 buf[i++] = '0' + value % 10;
132 value /= 10;
133 }
134 return i;
135}
136
137/** print long decimal into buffer, returns length */
138static int
139print_dec_ll(char* buf, int max, unsigned long long value)
140{
141 int i = 0;
142 if(value == 0) {
143 if(max > 0) {
144 buf[0] = '0';
145 i = 1;
146 }
147 } else while(value && i < max) {
148 buf[i++] = '0' + value % 10;
149 value /= 10;
150 }
151 return i;
152}
153
154/** print hex into buffer, returns length */
155static int
156print_hex(char* buf, int max, unsigned int value)
157{
158 const char* h = "0123456789abcdef";
159 int i = 0;
160 if(value == 0) {
161 if(max > 0) {
162 buf[0] = '0';
163 i = 1;
164 }
165 } else while(value && i < max) {
166 buf[i++] = h[value & 0x0f];
167 value >>= 4;
168 }
169 return i;
170}
171
172/** print long hex into buffer, returns length */
173static int
174print_hex_l(char* buf, int max, unsigned long value)
175{
176 const char* h = "0123456789abcdef";
177 int i = 0;
178 if(value == 0) {
179 if(max > 0) {
180 buf[0] = '0';
181 i = 1;
182 }
183 } else while(value && i < max) {
184 buf[i++] = h[value & 0x0f];
185 value >>= 4;
186 }
187 return i;
188}
189
190/** print long long hex into buffer, returns length */
191static int
192print_hex_ll(char* buf, int max, unsigned long long value)
193{
194 const char* h = "0123456789abcdef";
195 int i = 0;
196 if(value == 0) {
197 if(max > 0) {
198 buf[0] = '0';
199 i = 1;
200 }
201 } else while(value && i < max) {
202 buf[i++] = h[value & 0x0f];
203 value >>= 4;
204 }
205 return i;
206}
207
208/** copy string into result, reversed */
209static void
210spool_str_rev(char** at, size_t* left, int* ret, const char* buf, int len)
211{
212 int i = len;
213 while(i) {
214 if(*left > 1) {
215 *(*at)++ = buf[--i];
216 (*left)--;
217 } else --i;
218 (*ret)++;
219 }
220}
221
222/** copy string into result */
223static void
224spool_str(char** at, size_t* left, int* ret, const char* buf, int len)
225{
226 int i;
227 for(i=0; i<len; i++) {
228 if(*left > 1) {
229 *(*at)++ = buf[i];
230 (*left)--;
231 }
232 (*ret)++;
233 }
234}
235
236/** print number formatted */
237static void
238print_num(char** at, size_t* left, int* ret, int minw, int precision,
239 int prgiven, int zeropad, int minus, int plus, int space,
240 int zero, int negative, char* buf, int len)
241{
242 int w = len; /* excludes minus sign */
243 char s = get_negsign(negative, plus, space);
244 if(minus) {
245 /* left adjust the number into the field, space padding */
246 /* calc numw = [sign][zeroes][number] */
247 int numw = w;
248 if(precision == 0 && zero) numw = 0;
249 if(numw < precision) numw = precision;
250 if(s) numw++;
251
252 /* sign */
253 if(s) print_pad(at, left, ret, s, 1);
254
255 /* number */
256 if(precision == 0 && zero) {
257 /* "" for the number */
258 } else {
259 if(w < precision)
260 print_pad(at, left, ret, '0', precision - w);
261 spool_str_rev(at, left, ret, buf, len);
262 }
263 /* spaces */
264 if(numw < minw)
265 print_pad(at, left, ret, ' ', minw - numw);
266 } else {
267 /* pad on the left of the number */
268 /* calculate numw has width of [sign][zeroes][number] */
269 int numw = w;
270 if(precision == 0 && zero) numw = 0;
271 if(numw < precision) numw = precision;
272 if(!prgiven && zeropad && numw < minw) numw = minw;
273 else if(s) numw++;
274
275 /* pad with spaces */
276 if(numw < minw)
277 print_pad(at, left, ret, ' ', minw - numw);
278 /* print sign (and one less zeropad if so) */
279 if(s) {
280 print_pad(at, left, ret, s, 1);
281 numw--;
282 }
283 /* pad with zeroes */
284 if(w < numw)
285 print_pad(at, left, ret, '0', numw - w);
286 if(precision == 0 && zero)
287 return;
288 /* print the characters for the value */
289 spool_str_rev(at, left, ret, buf, len);
290 }
291}
292
293/** print %d and %i */
294static void
295print_num_d(char** at, size_t* left, int* ret, int value,
296 int minw, int precision, int prgiven, int zeropad, int minus,
297 int plus, int space)
298{
299 char buf[PRINT_DEC_BUFSZ];
300 int negative = (value < 0);
301 int zero = (value == 0);
302 int len = print_dec(buf, (int)sizeof(buf),
303 (unsigned int)(negative?-value:value));
304 print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
305 plus, space, zero, negative, buf, len);
306}
307
308/** print %ld and %li */
309static void
310print_num_ld(char** at, size_t* left, int* ret, long value,
311 int minw, int precision, int prgiven, int zeropad, int minus,
312 int plus, int space)
313{
314 char buf[PRINT_DEC_BUFSZ];
315 int negative = (value < 0);
316 int zero = (value == 0);
317 int len = print_dec_l(buf, (int)sizeof(buf),
318 (unsigned long)(negative?-value:value));
319 print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
320 plus, space, zero, negative, buf, len);
321}
322
323/** print %lld and %lli */
324static void
325print_num_lld(char** at, size_t* left, int* ret, long long value,
326 int minw, int precision, int prgiven, int zeropad, int minus,
327 int plus, int space)
328{
329 char buf[PRINT_DEC_BUFSZ];
330 int negative = (value < 0);
331 int zero = (value == 0);
332 int len = print_dec_ll(buf, (int)sizeof(buf),
333 (unsigned long long)(negative?-value:value));
334 print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
335 plus, space, zero, negative, buf, len);
336}
337
338/** print %u */
339static void
340print_num_u(char** at, size_t* left, int* ret, unsigned int value,
341 int minw, int precision, int prgiven, int zeropad, int minus,
342 int plus, int space)
343{
344 char buf[PRINT_DEC_BUFSZ];
345 int negative = 0;
346 int zero = (value == 0);
347 int len = print_dec(buf, (int)sizeof(buf), value);
348 print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
349 plus, space, zero, negative, buf, len);
350}
351
352/** print %lu */
353static void
354print_num_lu(char** at, size_t* left, int* ret, unsigned long value,
355 int minw, int precision, int prgiven, int zeropad, int minus,
356 int plus, int space)
357{
358 char buf[PRINT_DEC_BUFSZ];
359 int negative = 0;
360 int zero = (value == 0);
361 int len = print_dec_l(buf, (int)sizeof(buf), value);
362 print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
363 plus, space, zero, negative, buf, len);
364}
365
366/** print %llu */
367static void
368print_num_llu(char** at, size_t* left, int* ret, unsigned long long value,
369 int minw, int precision, int prgiven, int zeropad, int minus,
370 int plus, int space)
371{
372 char buf[PRINT_DEC_BUFSZ];
373 int negative = 0;
374 int zero = (value == 0);
375 int len = print_dec_ll(buf, (int)sizeof(buf), value);
376 print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
377 plus, space, zero, negative, buf, len);
378}
379
380/** print %x */
381static void
382print_num_x(char** at, size_t* left, int* ret, unsigned int value,
383 int minw, int precision, int prgiven, int zeropad, int minus,
384 int plus, int space)
385{
386 char buf[PRINT_DEC_BUFSZ];
387 int negative = 0;
388 int zero = (value == 0);
389 int len = print_hex(buf, (int)sizeof(buf), value);
390 print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
391 plus, space, zero, negative, buf, len);
392}
393
394/** print %lx */
395static void
396print_num_lx(char** at, size_t* left, int* ret, unsigned long value,
397 int minw, int precision, int prgiven, int zeropad, int minus,
398 int plus, int space)
399{
400 char buf[PRINT_DEC_BUFSZ];
401 int negative = 0;
402 int zero = (value == 0);
403 int len = print_hex_l(buf, (int)sizeof(buf), value);
404 print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
405 plus, space, zero, negative, buf, len);
406}
407
408/** print %llx */
409static void
410print_num_llx(char** at, size_t* left, int* ret, unsigned long long value,
411 int minw, int precision, int prgiven, int zeropad, int minus,
412 int plus, int space)
413{
414 char buf[PRINT_DEC_BUFSZ];
415 int negative = 0;
416 int zero = (value == 0);
417 int len = print_hex_ll(buf, (int)sizeof(buf), value);
418 print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
419 plus, space, zero, negative, buf, len);
420}
421
422/** print %llp */
423static void
424print_num_llp(char** at, size_t* left, int* ret, void* value,
425 int minw, int precision, int prgiven, int zeropad, int minus,
426 int plus, int space)
427{
428 char buf[PRINT_DEC_BUFSZ];
429 int negative = 0;
430 int zero = (value == 0);
431#if defined(UINTPTR_MAX) && defined(UINT32_MAX) && (UINTPTR_MAX == UINT32_MAX)
432 /* avoid warning about upcast on 32bit systems */
433 unsigned long long llvalue = (unsigned long)value;
434#else
435 unsigned long long llvalue = (unsigned long long)value;
436#endif
437 int len = print_hex_ll(buf, (int)sizeof(buf), llvalue);
438 if(zero) {
439 buf[0]=')';
440 buf[1]='l';
441 buf[2]='i';
442 buf[3]='n';
443 buf[4]='(';
444 len = 5;
445 } else {
446 /* put '0x' in front of the (reversed) buffer result */
447 if(len < PRINT_DEC_BUFSZ)
448 buf[len++] = 'x';
449 if(len < PRINT_DEC_BUFSZ)
450 buf[len++] = '0';
451 }
452 print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
453 plus, space, zero, negative, buf, len);
454}
455
456#define PRINT_FLOAT_BUFSZ 64 /* xx.yy with 20.20 about the max */
457/** spool remainder after the decimal point to buffer, in reverse */
458static int
459print_remainder(char* buf, int max, double r, int prec)
460{
461 unsigned long long cap = 1;
462 unsigned long long value;
463 int len, i;
464 if(prec > 19) prec = 19; /* max we can do */
465 if(max < prec) return 0;
466 for(i=0; i<prec; i++) {
467 cap *= 10;
468 }
469 r *= (double)cap;
470 value = (unsigned long long)r;
471 /* see if we need to round up */
472 if(((unsigned long long)((r - (double)value)*10.0)) >= 5) {
473 value++;
474 /* that might carry to numbers before the comma, if so,
475 * just ignore that rounding. failure because 64bitprintout */
476 if(value >= cap)
477 value = cap-1;
478 }
479 len = print_dec_ll(buf, max, value);
480 while(len < prec) { /* pad with zeroes, e.g. if 0.0012 */
481 buf[len++] = '0';
482 }
483 if(len < max)
484 buf[len++] = '.';
485 return len;
486}
487
488/** spool floating point to buffer */
489static int
490print_float(char* buf, int max, double value, int prec)
491{
492 /* as xxx.xxx if prec==0, no '.', with prec decimals after . */
493 /* no conversion for NAN and INF, because we do not want to require
494 linking with -lm. */
495 /* Thus, the conversions use 64bit integers to convert the numbers,
496 * which makes 19 digits before and after the decimal point the max */
497 unsigned long long whole = (unsigned long long)value;
498 double remain = value - (double)whole;
499 int len = 0;
500 if(prec != 0)
501 len = print_remainder(buf, max, remain, prec);
502 len += print_dec_ll(buf+len, max-len, whole);
503 return len;
504}
505
506/** print %f */
507static void
508print_num_f(char** at, size_t* left, int* ret, double value,
509 int minw, int precision, int prgiven, int zeropad, int minus,
510 int plus, int space)
511{
512 char buf[PRINT_FLOAT_BUFSZ];
513 int negative = (value < 0);
514 int zero = 0;
515 int len;
516 if(!prgiven) precision = 6;
517 len = print_float(buf, (int)sizeof(buf), negative?-value:value,
518 precision);
519 print_num(at, left, ret, minw, 1, 0, zeropad, minus,
520 plus, space, zero, negative, buf, len);
521}
522
523/* rudimentary %g support */
524static int
525print_float_g(char* buf, int max, double value, int prec)
526{
527 unsigned long long whole = (unsigned long long)value;
528 double remain = value - (double)whole;
529 int before = 0;
530 int len = 0;
531
532 /* number of digits before the decimal point */
533 while(whole > 0) {
534 before++;
535 whole /= 10;
536 }
537 whole = (unsigned long long)value;
538
539 if(prec > before && remain != 0.0) {
540 /* see if the last decimals are zero, if so, skip them */
541 len = print_remainder(buf, max, remain, prec-before);
542 while(len > 0 && buf[0]=='0') {
543 memmove(buf, buf+1, --len);
544 }
545 }
546 len += print_dec_ll(buf+len, max-len, whole);
547 return len;
548}
549
550
551/** print %g */
552static void
553print_num_g(char** at, size_t* left, int* ret, double value,
554 int minw, int precision, int prgiven, int zeropad, int minus,
555 int plus, int space)
556{
557 char buf[PRINT_FLOAT_BUFSZ];
558 int negative = (value < 0);
559 int zero = 0;
560 int len;
561 if(!prgiven) precision = 6;
562 if(precision == 0) precision = 1;
563 len = print_float_g(buf, (int)sizeof(buf), negative?-value:value,
564 precision);
565 print_num(at, left, ret, minw, 1, 0, zeropad, minus,
566 plus, space, zero, negative, buf, len);
567}
568
569
570/** strnlen (compat implementation) */
571static int
572my_strnlen(const char* s, int max)
573{
574 int i;
575 for(i=0; i<max; i++)
576 if(s[i]==0)
577 return i;
578 return max;
579}
580
581/** print %s */
582static void
583print_str(char** at, size_t* left, int* ret, char* s,
584 int minw, int precision, int prgiven, int minus)
585{
586 int w;
587 /* with prec: no more than x characters from this string, stop at 0 */
588 if(prgiven)
589 w = my_strnlen(s, precision);
590 else w = (int)strlen(s); /* up to the nul */
591 if(w < minw && !minus)
592 print_pad(at, left, ret, ' ', minw - w);
593 spool_str(at, left, ret, s, w);
594 if(w < minw && minus)
595 print_pad(at, left, ret, ' ', minw - w);
596}
597
598/** print %c */
599static void
600print_char(char** at, size_t* left, int* ret, int c,
601 int minw, int minus)
602{
603 if(1 < minw && !minus)
604 print_pad(at, left, ret, ' ', minw - 1);
605 print_pad(at, left, ret, c, 1);
606 if(1 < minw && minus)
607 print_pad(at, left, ret, ' ', minw - 1);
608}
609
610
611/**
612 * Print to string.
613 * str: string buffer for result. result will be null terminated.
614 * size: size of the buffer. null is put inside buffer.
615 * format: printf format string.
616 * arg: '...' arguments to print.
617 * returns number of characters. a null is printed after this.
618 * return number of bytes that would have been written
619 * if the buffer had been large enough.
620 *
621 * supported format specifiers:
622 * %s, %u, %d, %x, %i, %f, %g, %c, %p, %n.
623 * length: l, ll (for d, u, x).
624 * precision: 6.6d (for d, u, x)
625 * %f, %g precisions, 0.3f
626 * %20s, '.*s'
627 * and %%.
628 */
629int vsnprintf(char* str, size_t size, const char* format, va_list arg)
630{
631 char* at = str;
632 size_t left = size;
633 int ret = 0;
634 const char* fmt = format;
635 int conv, minw, precision, prgiven, zeropad, minus, plus, space, length;
636 while(*fmt) {
637 /* copy string before % */
638 while(*fmt && *fmt!='%') {
639 if(left > 1) {
640 *at++ = *fmt++;
641 left--;
642 } else fmt++;
643 ret++;
644 }
645
646 /* see if we are at end */
647 if(!*fmt) break;
648
649 /* fetch next argument % designation from format string */
650 fmt++; /* skip the '%' */
651
652 /********************************/
653 /* get the argument designation */
654 /********************************/
655 /* we must do this vararg stuff inside this function for
656 * portability. Hence, get_designation, and print_designation
657 * are not their own functions. */
658
659 /* printout designation:
660 * conversion specifier: x, d, u, s, c, n, m, p
661 * flags: # not supported
662 * 0 zeropad (on the left)
663 * - left adjust (right by default)
664 * ' ' printspace for positive number (in - position).
665 * + alwayssign
666 * fieldwidth: [1-9][0-9]* minimum field width.
667 * if this is * then type int next argument specifies the minwidth.
668 * if this is negative, the - flag is set (with positive width).
669 * precision: period[digits]*, %.2x.
670 * if this is * then type int next argument specifies the precision.
671 * just '.' or negative value means precision=0.
672 * this is mindigits to print for d, i, u, x
673 * this is aftercomma digits for f
674 * this is max number significant digits for g
675 * maxnumber characters to be printed for s
676 * length: 0-none (int), 1-l (long), 2-ll (long long)
677 * notsupported: hh (char), h (short), L (long double), q, j, z, t
678 * Does not support %m$ and *m$ argument designation as array indices.
679 * Does not support %#x
680 *
681 */
682 minw = 0;
683 precision = 1;
684 prgiven = 0;
685 zeropad = 0;
686 minus = 0;
687 plus = 0;
688 space = 0;
689 length = 0;
690
691 /* get flags in any order */
692 for(;;) {
693 if(*fmt == '0')
694 zeropad = 1;
695 else if(*fmt == '-')
696 minus = 1;
697 else if(*fmt == '+')
698 plus = 1;
699 else if(*fmt == ' ')
700 space = 1;
701 else break;
702 fmt++;
703 }
704
705 /* field width */
706 if(*fmt == '*') {
707 fmt++; /* skip char */
708 minw = va_arg(arg, int);
709 if(minw < 0) {
710 minus = 1;
711 minw = -minw;
712 }
713 } else while(*fmt >= '0' && *fmt <= '9') {
714 minw = minw*10 + (*fmt++)-'0';
715 }
716
717 /* precision */
718 if(*fmt == '.') {
719 fmt++; /* skip period */
720 prgiven = 1;
721 precision = 0;
722 if(*fmt == '*') {
723 fmt++; /* skip char */
724 precision = va_arg(arg, int);
725 if(precision < 0)
726 precision = 0;
727 } else while(*fmt >= '0' && *fmt <= '9') {
728 precision = precision*10 + (*fmt++)-'0';
729 }
730 }
731
732 /* length */
733 if(*fmt == 'l') {
734 fmt++; /* skip char */
735 length = 1;
736 if(*fmt == 'l') {
737 fmt++; /* skip char */
738 length = 2;
739 }
740 }
741
742 /* get the conversion */
743 if(!*fmt) conv = 0;
744 else conv = *fmt++;
745
746 /***********************************/
747 /* print that argument designation */
748 /***********************************/
749 switch(conv) {
750 case 'i':
751 case 'd':
752 if(length == 0)
753 print_num_d(&at, &left, &ret, va_arg(arg, int),
754 minw, precision, prgiven, zeropad, minus, plus, space);
755 else if(length == 1)
756 print_num_ld(&at, &left, &ret, va_arg(arg, long),
757 minw, precision, prgiven, zeropad, minus, plus, space);
758 else if(length == 2)
759 print_num_lld(&at, &left, &ret,
760 va_arg(arg, long long),
761 minw, precision, prgiven, zeropad, minus, plus, space);
762 break;
763 case 'u':
764 if(length == 0)
765 print_num_u(&at, &left, &ret,
766 va_arg(arg, unsigned int),
767 minw, precision, prgiven, zeropad, minus, plus, space);
768 else if(length == 1)
769 print_num_lu(&at, &left, &ret,
770 va_arg(arg, unsigned long),
771 minw, precision, prgiven, zeropad, minus, plus, space);
772 else if(length == 2)
773 print_num_llu(&at, &left, &ret,
774 va_arg(arg, unsigned long long),
775 minw, precision, prgiven, zeropad, minus, plus, space);
776 break;
777 case 'x':
778 if(length == 0)
779 print_num_x(&at, &left, &ret,
780 va_arg(arg, unsigned int),
781 minw, precision, prgiven, zeropad, minus, plus, space);
782 else if(length == 1)
783 print_num_lx(&at, &left, &ret,
784 va_arg(arg, unsigned long),
785 minw, precision, prgiven, zeropad, minus, plus, space);
786 else if(length == 2)
787 print_num_llx(&at, &left, &ret,
788 va_arg(arg, unsigned long long),
789 minw, precision, prgiven, zeropad, minus, plus, space);
790 break;
791 case 's':
792 print_str(&at, &left, &ret, va_arg(arg, char*),
793 minw, precision, prgiven, minus);
794 break;
795 case 'c':
796 print_char(&at, &left, &ret, va_arg(arg, int),
797 minw, minus);
798 break;
799 case 'n':
800 *va_arg(arg, int*) = ret;
801 break;
802 case 'm':
803 print_str(&at, &left, &ret, strerror(errno),
804 minw, precision, prgiven, minus);
805 break;
806 case 'p':
807 print_num_llp(&at, &left, &ret, va_arg(arg, void*),
808 minw, precision, prgiven, zeropad, minus, plus, space);
809 break;
810 case '%':
811 print_pad(&at, &left, &ret, '%', 1);
812 break;
813 case 'f':
814 print_num_f(&at, &left, &ret, va_arg(arg, double),
815 minw, precision, prgiven, zeropad, minus, plus, space);
816 break;
817 case 'g':
818 print_num_g(&at, &left, &ret, va_arg(arg, double),
819 minw, precision, prgiven, zeropad, minus, plus, space);
820 break;
821 /* unknown */
822 default:
823 case 0: break;
824 }
825 }
826
827 /* zero terminate */
828 if(left > 0)
829 *at = 0;
830 return ret;
831}
832
833#ifdef SNPRINTF_TEST
834
835/** do tests */
836#undef snprintf
837#define DOTEST(bufsz, result, retval, ...) do { \
838 char buf[bufsz]; \
839 printf("now test %s\n", #__VA_ARGS__); \
840 int r=my_snprintf(buf, sizeof(buf), __VA_ARGS__); \
841 if(r != retval || strcmp(buf, result) != 0) { \
842 printf("error test(%s) was \"%s\":%d\n", \
843 ""#bufsz", "#result", "#retval", "#__VA_ARGS__, \
844 buf, r); \
845 exit(1); \
846 } \
847 r=snprintf(buf, sizeof(buf), __VA_ARGS__); \
848 if(r != retval || strcmp(buf, result) != 0) { \
849 printf("error test(%s) differs with system, \"%s\":%d\n", \
850 ""#bufsz", "#result", "#retval", "#__VA_ARGS__, \
851 buf, r); \
852 exit(1); \
853 } \
854 printf("test(\"%s\":%d) passed\n", buf, r); \
855 } while(0);
856
857/** test program */
858int main(void)
859{
860 int x = 0;
861
862 /* bufsize, expectedstring, expectedretval, snprintf arguments */
863 DOTEST(1024, "hello", 5, "hello");
864 DOTEST(1024, "h", 1, "h");
865 /* warning from gcc for format string, but it does work
866 * DOTEST(1024, "", 0, ""); */
867
868 DOTEST(3, "he", 5, "hello");
869 DOTEST(1, "", 7, "%d", 7823089);
870
871 /* test positive numbers */
872 DOTEST(1024, "0", 1, "%d", 0);
873 DOTEST(1024, "1", 1, "%d", 1);
874 DOTEST(1024, "9", 1, "%d", 9);
875 DOTEST(1024, "15", 2, "%d", 15);
876 DOTEST(1024, "ab15cd", 6, "ab%dcd", 15);
877 DOTEST(1024, "167", 3, "%d", 167);
878 DOTEST(1024, "7823089", 7, "%d", 7823089);
879 DOTEST(1024, " 12", 3, "%3d", 12);
880 DOTEST(1024, "012", 3, "%.3d", 12);
881 DOTEST(1024, "012", 3, "%3.3d", 12);
882 DOTEST(1024, "012", 3, "%03d", 12);
883 DOTEST(1024, " 012", 4, "%4.3d", 12);
884 DOTEST(1024, "", 0, "%.0d", 0);
885
886 /* test negative numbers */
887 DOTEST(1024, "-1", 2, "%d", -1);
888 DOTEST(1024, "-12", 3, "%3d", -12);
889 DOTEST(1024, " -2", 3, "%3d", -2);
890 DOTEST(1024, "-012", 4, "%.3d", -12);
891 DOTEST(1024, "-012", 4, "%3.3d", -12);
892 DOTEST(1024, "-012", 4, "%4.3d", -12);
893 DOTEST(1024, " -012", 5, "%5.3d", -12);
894 DOTEST(1024, "-12", 3, "%03d", -12);
895 DOTEST(1024, "-02", 3, "%03d", -2);
896 DOTEST(1024, "-15", 3, "%d", -15);
897 DOTEST(1024, "-7307", 5, "%d", -7307);
898 DOTEST(1024, "-12 ", 5, "%-5d", -12);
899 DOTEST(1024, "-00012", 6, "%-.5d", -12);
900
901 /* test + and space flags */
902 DOTEST(1024, "+12", 3, "%+d", 12);
903 DOTEST(1024, " 12", 3, "% d", 12);
904
905 /* test %u */
906 DOTEST(1024, "12", 2, "%u", 12);
907 DOTEST(1024, "0", 1, "%u", 0);
908 DOTEST(1024, "4294967295", 10, "%u", 0xffffffff);
909
910 /* test %x */
911 DOTEST(1024, "0", 1, "%x", 0);
912 DOTEST(1024, "c", 1, "%x", 12);
913 DOTEST(1024, "12ab34cd", 8, "%x", 0x12ab34cd);
914
915 /* test %llu, %lld */
916 DOTEST(1024, "18446744073709551615", 20, "%llu",
917 (long long)0xffffffffffffffff);
918 DOTEST(1024, "-9223372036854775808", 20, "%lld",
919 (long long)0x8000000000000000);
920 DOTEST(1024, "9223372036854775808", 19, "%llu",
921 (long long)0x8000000000000000);
922
923 /* test %s */
924 DOTEST(1024, "hello", 5, "%s", "hello");
925 DOTEST(1024, " hello", 10, "%10s", "hello");
926 DOTEST(1024, "hello ", 10, "%-10s", "hello");
927 DOTEST(1024, "he", 2, "%.2s", "hello");
928 DOTEST(1024, " he", 4, "%4.2s", "hello");
929 DOTEST(1024, " h", 4, "%4.2s", "h");
930
931 /* test %c */
932 DOTEST(1024, "a", 1, "%c", 'a');
933 /* warning from gcc for format string, but it does work
934 DOTEST(1024, " a", 5, "%5c", 'a');
935 DOTEST(1024, "a", 1, "%.0c", 'a'); */
936
937 /* test %n */
938 DOTEST(1024, "hello", 5, "hello%n", &x);
939 if(x != 5) { printf("the %%n failed\n"); exit(1); }
940
941 /* test %m */
942 errno = 0;
943 DOTEST(1024, "Success", 7, "%m");
944
945 /* test %p */
946 DOTEST(1024, "0x10", 4, "%p", (void*)0x10);
947 DOTEST(1024, "(nil)", 5, "%p", (void*)0x0);
948
949 /* test %% */
950 DOTEST(1024, "%", 1, "%%");
951
952 /* test %f */
953 DOTEST(1024, "0.000000", 8, "%f", 0.0);
954 DOTEST(1024, "0.00", 4, "%.2f", 0.0);
955 /* differs, "-0.00" DOTEST(1024, "0.00", 4, "%.2f", -0.0); */
956 DOTEST(1024, "234.00", 6, "%.2f", 234.005);
957 DOTEST(1024, "8973497.1246", 12, "%.4f", 8973497.12456);
958 DOTEST(1024, "-12.000000", 10, "%f", -12.0);
959 DOTEST(1024, "6", 1, "%.0f", 6.0);
960
961 DOTEST(1024, "6", 1, "%g", 6.0);
962 DOTEST(1024, "6.1", 3, "%g", 6.1);
963 DOTEST(1024, "6.15", 4, "%g", 6.15);
964
965 /* These format strings are from the code of NSD, Unbound, ldns */
966
967 DOTEST(1024, "abcdef", 6, "%s", "abcdef");
968 DOTEST(1024, "005", 3, "%03u", 5);
969 DOTEST(1024, "12345", 5, "%03u", 12345);
970 DOTEST(1024, "5", 1, "%d", 5);
971 DOTEST(1024, "(nil)", 5, "%p", NULL);
972 DOTEST(1024, "12345", 5, "%ld", (long)12345);
973 DOTEST(1024, "12345", 5, "%lu", (long)12345);
974 DOTEST(1024, " 12345", 12, "%12u", (unsigned)12345);
975 DOTEST(1024, "12345", 5, "%u", (unsigned)12345);
976 DOTEST(1024, "12345", 5, "%llu", (unsigned long long)12345);
977 DOTEST(1024, "12345", 5, "%x", 0x12345);
978 DOTEST(1024, "12345", 5, "%llx", (long long)0x12345);
979 DOTEST(1024, "012345", 6, "%6.6d", 12345);
980 DOTEST(1024, "012345", 6, "%6.6u", 12345);
981 DOTEST(1024, "1234.54", 7, "%g", 1234.54);
982 DOTEST(1024, "123456789.54", 12, "%.12g", 123456789.54);
983 DOTEST(1024, "3456789123456.54", 16, "%.16g", 3456789123456.54);
984 /* %24g does not work with 24 digits, not enough accuracy,
985 * the first 16 digits are correct */
986 DOTEST(1024, "12345", 5, "%3.3d", 12345);
987 DOTEST(1024, "000", 3, "%3.3d", 0);
988 DOTEST(1024, "001", 3, "%3.3d", 1);
989 DOTEST(1024, "012", 3, "%3.3d", 12);
990 DOTEST(1024, "-012", 4, "%3.3d", -12);
991 DOTEST(1024, "he", 2, "%.2s", "hello");
992 DOTEST(1024, "helloworld", 10, "%s%s", "hello", "world");
993 DOTEST(1024, "he", 2, "%.*s", 2, "hello");
994 DOTEST(1024, " hello", 7, "%*s", 7, "hello");
995 DOTEST(1024, "hello ", 7, "%*s", -7, "hello");
996 DOTEST(1024, "0", 1, "%c", '0');
997 DOTEST(1024, "A", 1, "%c", 'A');
998 DOTEST(1024, "", 1, "%c", 0);
999 DOTEST(1024, "\010", 1, "%c", 8);
1000 DOTEST(1024, "%", 1, "%%");
1001 DOTEST(1024, "0a", 2, "%02x", 0x0a);
1002 DOTEST(1024, "bd", 2, "%02x", 0xbd);
1003 DOTEST(1024, "12", 2, "%02ld", (long)12);
1004 DOTEST(1024, "02", 2, "%02ld", (long)2);
1005 DOTEST(1024, "02", 2, "%02u", (unsigned)2);
1006 DOTEST(1024, "765432", 6, "%05u", (unsigned)765432);
1007 DOTEST(1024, "10.234", 6, "%0.3f", 10.23421);
1008 DOTEST(1024, "123456.234", 10, "%0.3f", 123456.23421);
1009 DOTEST(1024, "123456789.234", 13, "%0.3f", 123456789.23421);
1010 DOTEST(1024, "123456.23", 9, "%.2f", 123456.23421);
1011 DOTEST(1024, "123456", 6, "%.0f", 123456.23421);
1012 DOTEST(1024, "0123", 4, "%.4x", 0x0123);
1013 DOTEST(1024, "00000123", 8, "%.8x", 0x0123);
1014 DOTEST(1024, "ffeb0cde", 8, "%.8x", 0xffeb0cde);
1015 DOTEST(1024, " 987654321", 10, "%10lu", (unsigned long)987654321);
1016 DOTEST(1024, " 987654321", 12, "%12lu", (unsigned long)987654321);
1017 DOTEST(1024, "987654321", 9, "%i", 987654321);
1018 DOTEST(1024, "-87654321", 9, "%i", -87654321);
1019 DOTEST(1024, "hello ", 16, "%-16s", "hello");
1020 DOTEST(1024, " ", 16, "%-16s", "");
1021 DOTEST(1024, "a ", 16, "%-16s", "a");
1022 DOTEST(1024, "foobarfoobar ", 16, "%-16s", "foobarfoobar");
1023 DOTEST(1024, "foobarfoobarfoobar", 18, "%-16s", "foobarfoobarfoobar");
1024
1025 /* combined expressions */
1026 DOTEST(1024, "foo 1.0 size 512 edns", 21,
1027 "foo %s size %d %s%s", "1.0", 512, "", "edns");
1028 DOTEST(15, "foo 1.0 size 5", 21,
1029 "foo %s size %d %s%s", "1.0", 512, "", "edns");
1030 DOTEST(1024, "packet 1203ceff id", 18,
1031 "packet %2.2x%2.2x%2.2x%2.2x id", 0x12, 0x03, 0xce, 0xff);
1032 DOTEST(1024, "/tmp/testbound_123abcd.tmp", 26, "/tmp/testbound_%u%s%s.tmp", 123, "ab", "cd");
1033
1034 return 0;
1035}
1036#endif /* SNPRINTF_TEST */
2 *
3 * Copyright (c) 2013, NLnet Labs. All rights reserved.
4 *
5 * This software is open source.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * Redistributions of source code must retain the above copyright notice,
12 * this list of conditions and the following disclaimer.
13 *
14 * Redistributions in binary form must reproduce the above copyright notice,
15 * this list of conditions and the following disclaimer in the documentation
16 * and/or other materials provided with the distribution.
17 *
18 * Neither the name of the NLNET LABS nor the names of its contributors may
19 * be used to endorse or promote products derived from this software without
20 * specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
25 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
26 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
27 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
28 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
29 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
30 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
31 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
32 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 */
34
35#include "config.h"
36#include <stdio.h>
37#include <ctype.h>
38#include <string.h>
39#include <stdarg.h>
40#include <stdlib.h>
41#include <errno.h>
42#ifdef HAVE_STDINT_H
43#include <stdint.h>
44#endif
45
46/* for test */
47/* #define SNPRINTF_TEST 1 */
48#ifdef SNPRINTF_TEST
49#define snprintf my_snprintf
50#define vsnprintf my_vsnprintf
51#endif /* SNPRINTF_TEST */
52
53int snprintf(char* str, size_t size, const char* format, ...);
54int vsnprintf(char* str, size_t size, const char* format, va_list arg);
55
56/**
57 * Very portable snprintf implementation, limited in functionality,
58 * esp. for %[capital] %[nonportable] and so on. Reduced float functionality,
59 * mostly in formatting and range (e+-16), for %f and %g.
60 *
61 * %s, %d, %u, %i, %x, %c, %n and %% are fully supported.
62 * This includes width, precision, flags 0- +, and *(arg for wid,prec).
63 * %f, %g, %m, %p have reduced support, support for wid,prec,flags,*, but
64 * less floating point range, no %e formatting for %g.
65 */
66int snprintf(char* str, size_t size, const char* format, ...)
67{
68 int r;
69 va_list args;
70 va_start(args, format);
71 r = vsnprintf(str, size, format, args);
72 va_end(args);
73 return r;
74}
75
76/** add padding to string */
77static void
78print_pad(char** at, size_t* left, int* ret, char p, int num)
79{
80 while(num--) {
81 if(*left > 1) {
82 *(*at)++ = p;
83 (*left)--;
84 }
85 (*ret)++;
86 }
87}
88
89/** get negative symbol, 0 if none */
90static char
91get_negsign(int negative, int plus, int space)
92{
93 if(negative)
94 return '-';
95 if(plus)
96 return '+';
97 if(space)
98 return ' ';
99 return 0;
100}
101
102#define PRINT_DEC_BUFSZ 32 /* 20 is enough for 64 bit decimals */
103/** print decimal into buffer, returns length */
104static int
105print_dec(char* buf, int max, unsigned int value)
106{
107 int i = 0;
108 if(value == 0) {
109 if(max > 0) {
110 buf[0] = '0';
111 i = 1;
112 }
113 } else while(value && i < max) {
114 buf[i++] = '0' + value % 10;
115 value /= 10;
116 }
117 return i;
118}
119
120/** print long decimal into buffer, returns length */
121static int
122print_dec_l(char* buf, int max, unsigned long value)
123{
124 int i = 0;
125 if(value == 0) {
126 if(max > 0) {
127 buf[0] = '0';
128 i = 1;
129 }
130 } else while(value && i < max) {
131 buf[i++] = '0' + value % 10;
132 value /= 10;
133 }
134 return i;
135}
136
137/** print long decimal into buffer, returns length */
138static int
139print_dec_ll(char* buf, int max, unsigned long long value)
140{
141 int i = 0;
142 if(value == 0) {
143 if(max > 0) {
144 buf[0] = '0';
145 i = 1;
146 }
147 } else while(value && i < max) {
148 buf[i++] = '0' + value % 10;
149 value /= 10;
150 }
151 return i;
152}
153
154/** print hex into buffer, returns length */
155static int
156print_hex(char* buf, int max, unsigned int value)
157{
158 const char* h = "0123456789abcdef";
159 int i = 0;
160 if(value == 0) {
161 if(max > 0) {
162 buf[0] = '0';
163 i = 1;
164 }
165 } else while(value && i < max) {
166 buf[i++] = h[value & 0x0f];
167 value >>= 4;
168 }
169 return i;
170}
171
172/** print long hex into buffer, returns length */
173static int
174print_hex_l(char* buf, int max, unsigned long value)
175{
176 const char* h = "0123456789abcdef";
177 int i = 0;
178 if(value == 0) {
179 if(max > 0) {
180 buf[0] = '0';
181 i = 1;
182 }
183 } else while(value && i < max) {
184 buf[i++] = h[value & 0x0f];
185 value >>= 4;
186 }
187 return i;
188}
189
190/** print long long hex into buffer, returns length */
191static int
192print_hex_ll(char* buf, int max, unsigned long long value)
193{
194 const char* h = "0123456789abcdef";
195 int i = 0;
196 if(value == 0) {
197 if(max > 0) {
198 buf[0] = '0';
199 i = 1;
200 }
201 } else while(value && i < max) {
202 buf[i++] = h[value & 0x0f];
203 value >>= 4;
204 }
205 return i;
206}
207
208/** copy string into result, reversed */
209static void
210spool_str_rev(char** at, size_t* left, int* ret, const char* buf, int len)
211{
212 int i = len;
213 while(i) {
214 if(*left > 1) {
215 *(*at)++ = buf[--i];
216 (*left)--;
217 } else --i;
218 (*ret)++;
219 }
220}
221
222/** copy string into result */
223static void
224spool_str(char** at, size_t* left, int* ret, const char* buf, int len)
225{
226 int i;
227 for(i=0; i<len; i++) {
228 if(*left > 1) {
229 *(*at)++ = buf[i];
230 (*left)--;
231 }
232 (*ret)++;
233 }
234}
235
236/** print number formatted */
237static void
238print_num(char** at, size_t* left, int* ret, int minw, int precision,
239 int prgiven, int zeropad, int minus, int plus, int space,
240 int zero, int negative, char* buf, int len)
241{
242 int w = len; /* excludes minus sign */
243 char s = get_negsign(negative, plus, space);
244 if(minus) {
245 /* left adjust the number into the field, space padding */
246 /* calc numw = [sign][zeroes][number] */
247 int numw = w;
248 if(precision == 0 && zero) numw = 0;
249 if(numw < precision) numw = precision;
250 if(s) numw++;
251
252 /* sign */
253 if(s) print_pad(at, left, ret, s, 1);
254
255 /* number */
256 if(precision == 0 && zero) {
257 /* "" for the number */
258 } else {
259 if(w < precision)
260 print_pad(at, left, ret, '0', precision - w);
261 spool_str_rev(at, left, ret, buf, len);
262 }
263 /* spaces */
264 if(numw < minw)
265 print_pad(at, left, ret, ' ', minw - numw);
266 } else {
267 /* pad on the left of the number */
268 /* calculate numw has width of [sign][zeroes][number] */
269 int numw = w;
270 if(precision == 0 && zero) numw = 0;
271 if(numw < precision) numw = precision;
272 if(!prgiven && zeropad && numw < minw) numw = minw;
273 else if(s) numw++;
274
275 /* pad with spaces */
276 if(numw < minw)
277 print_pad(at, left, ret, ' ', minw - numw);
278 /* print sign (and one less zeropad if so) */
279 if(s) {
280 print_pad(at, left, ret, s, 1);
281 numw--;
282 }
283 /* pad with zeroes */
284 if(w < numw)
285 print_pad(at, left, ret, '0', numw - w);
286 if(precision == 0 && zero)
287 return;
288 /* print the characters for the value */
289 spool_str_rev(at, left, ret, buf, len);
290 }
291}
292
293/** print %d and %i */
294static void
295print_num_d(char** at, size_t* left, int* ret, int value,
296 int minw, int precision, int prgiven, int zeropad, int minus,
297 int plus, int space)
298{
299 char buf[PRINT_DEC_BUFSZ];
300 int negative = (value < 0);
301 int zero = (value == 0);
302 int len = print_dec(buf, (int)sizeof(buf),
303 (unsigned int)(negative?-value:value));
304 print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
305 plus, space, zero, negative, buf, len);
306}
307
308/** print %ld and %li */
309static void
310print_num_ld(char** at, size_t* left, int* ret, long value,
311 int minw, int precision, int prgiven, int zeropad, int minus,
312 int plus, int space)
313{
314 char buf[PRINT_DEC_BUFSZ];
315 int negative = (value < 0);
316 int zero = (value == 0);
317 int len = print_dec_l(buf, (int)sizeof(buf),
318 (unsigned long)(negative?-value:value));
319 print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
320 plus, space, zero, negative, buf, len);
321}
322
323/** print %lld and %lli */
324static void
325print_num_lld(char** at, size_t* left, int* ret, long long value,
326 int minw, int precision, int prgiven, int zeropad, int minus,
327 int plus, int space)
328{
329 char buf[PRINT_DEC_BUFSZ];
330 int negative = (value < 0);
331 int zero = (value == 0);
332 int len = print_dec_ll(buf, (int)sizeof(buf),
333 (unsigned long long)(negative?-value:value));
334 print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
335 plus, space, zero, negative, buf, len);
336}
337
338/** print %u */
339static void
340print_num_u(char** at, size_t* left, int* ret, unsigned int value,
341 int minw, int precision, int prgiven, int zeropad, int minus,
342 int plus, int space)
343{
344 char buf[PRINT_DEC_BUFSZ];
345 int negative = 0;
346 int zero = (value == 0);
347 int len = print_dec(buf, (int)sizeof(buf), value);
348 print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
349 plus, space, zero, negative, buf, len);
350}
351
352/** print %lu */
353static void
354print_num_lu(char** at, size_t* left, int* ret, unsigned long value,
355 int minw, int precision, int prgiven, int zeropad, int minus,
356 int plus, int space)
357{
358 char buf[PRINT_DEC_BUFSZ];
359 int negative = 0;
360 int zero = (value == 0);
361 int len = print_dec_l(buf, (int)sizeof(buf), value);
362 print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
363 plus, space, zero, negative, buf, len);
364}
365
366/** print %llu */
367static void
368print_num_llu(char** at, size_t* left, int* ret, unsigned long long value,
369 int minw, int precision, int prgiven, int zeropad, int minus,
370 int plus, int space)
371{
372 char buf[PRINT_DEC_BUFSZ];
373 int negative = 0;
374 int zero = (value == 0);
375 int len = print_dec_ll(buf, (int)sizeof(buf), value);
376 print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
377 plus, space, zero, negative, buf, len);
378}
379
380/** print %x */
381static void
382print_num_x(char** at, size_t* left, int* ret, unsigned int value,
383 int minw, int precision, int prgiven, int zeropad, int minus,
384 int plus, int space)
385{
386 char buf[PRINT_DEC_BUFSZ];
387 int negative = 0;
388 int zero = (value == 0);
389 int len = print_hex(buf, (int)sizeof(buf), value);
390 print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
391 plus, space, zero, negative, buf, len);
392}
393
394/** print %lx */
395static void
396print_num_lx(char** at, size_t* left, int* ret, unsigned long value,
397 int minw, int precision, int prgiven, int zeropad, int minus,
398 int plus, int space)
399{
400 char buf[PRINT_DEC_BUFSZ];
401 int negative = 0;
402 int zero = (value == 0);
403 int len = print_hex_l(buf, (int)sizeof(buf), value);
404 print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
405 plus, space, zero, negative, buf, len);
406}
407
408/** print %llx */
409static void
410print_num_llx(char** at, size_t* left, int* ret, unsigned long long value,
411 int minw, int precision, int prgiven, int zeropad, int minus,
412 int plus, int space)
413{
414 char buf[PRINT_DEC_BUFSZ];
415 int negative = 0;
416 int zero = (value == 0);
417 int len = print_hex_ll(buf, (int)sizeof(buf), value);
418 print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
419 plus, space, zero, negative, buf, len);
420}
421
422/** print %llp */
423static void
424print_num_llp(char** at, size_t* left, int* ret, void* value,
425 int minw, int precision, int prgiven, int zeropad, int minus,
426 int plus, int space)
427{
428 char buf[PRINT_DEC_BUFSZ];
429 int negative = 0;
430 int zero = (value == 0);
431#if defined(UINTPTR_MAX) && defined(UINT32_MAX) && (UINTPTR_MAX == UINT32_MAX)
432 /* avoid warning about upcast on 32bit systems */
433 unsigned long long llvalue = (unsigned long)value;
434#else
435 unsigned long long llvalue = (unsigned long long)value;
436#endif
437 int len = print_hex_ll(buf, (int)sizeof(buf), llvalue);
438 if(zero) {
439 buf[0]=')';
440 buf[1]='l';
441 buf[2]='i';
442 buf[3]='n';
443 buf[4]='(';
444 len = 5;
445 } else {
446 /* put '0x' in front of the (reversed) buffer result */
447 if(len < PRINT_DEC_BUFSZ)
448 buf[len++] = 'x';
449 if(len < PRINT_DEC_BUFSZ)
450 buf[len++] = '0';
451 }
452 print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
453 plus, space, zero, negative, buf, len);
454}
455
456#define PRINT_FLOAT_BUFSZ 64 /* xx.yy with 20.20 about the max */
457/** spool remainder after the decimal point to buffer, in reverse */
458static int
459print_remainder(char* buf, int max, double r, int prec)
460{
461 unsigned long long cap = 1;
462 unsigned long long value;
463 int len, i;
464 if(prec > 19) prec = 19; /* max we can do */
465 if(max < prec) return 0;
466 for(i=0; i<prec; i++) {
467 cap *= 10;
468 }
469 r *= (double)cap;
470 value = (unsigned long long)r;
471 /* see if we need to round up */
472 if(((unsigned long long)((r - (double)value)*10.0)) >= 5) {
473 value++;
474 /* that might carry to numbers before the comma, if so,
475 * just ignore that rounding. failure because 64bitprintout */
476 if(value >= cap)
477 value = cap-1;
478 }
479 len = print_dec_ll(buf, max, value);
480 while(len < prec) { /* pad with zeroes, e.g. if 0.0012 */
481 buf[len++] = '0';
482 }
483 if(len < max)
484 buf[len++] = '.';
485 return len;
486}
487
488/** spool floating point to buffer */
489static int
490print_float(char* buf, int max, double value, int prec)
491{
492 /* as xxx.xxx if prec==0, no '.', with prec decimals after . */
493 /* no conversion for NAN and INF, because we do not want to require
494 linking with -lm. */
495 /* Thus, the conversions use 64bit integers to convert the numbers,
496 * which makes 19 digits before and after the decimal point the max */
497 unsigned long long whole = (unsigned long long)value;
498 double remain = value - (double)whole;
499 int len = 0;
500 if(prec != 0)
501 len = print_remainder(buf, max, remain, prec);
502 len += print_dec_ll(buf+len, max-len, whole);
503 return len;
504}
505
506/** print %f */
507static void
508print_num_f(char** at, size_t* left, int* ret, double value,
509 int minw, int precision, int prgiven, int zeropad, int minus,
510 int plus, int space)
511{
512 char buf[PRINT_FLOAT_BUFSZ];
513 int negative = (value < 0);
514 int zero = 0;
515 int len;
516 if(!prgiven) precision = 6;
517 len = print_float(buf, (int)sizeof(buf), negative?-value:value,
518 precision);
519 print_num(at, left, ret, minw, 1, 0, zeropad, minus,
520 plus, space, zero, negative, buf, len);
521}
522
523/* rudimentary %g support */
524static int
525print_float_g(char* buf, int max, double value, int prec)
526{
527 unsigned long long whole = (unsigned long long)value;
528 double remain = value - (double)whole;
529 int before = 0;
530 int len = 0;
531
532 /* number of digits before the decimal point */
533 while(whole > 0) {
534 before++;
535 whole /= 10;
536 }
537 whole = (unsigned long long)value;
538
539 if(prec > before && remain != 0.0) {
540 /* see if the last decimals are zero, if so, skip them */
541 len = print_remainder(buf, max, remain, prec-before);
542 while(len > 0 && buf[0]=='0') {
543 memmove(buf, buf+1, --len);
544 }
545 }
546 len += print_dec_ll(buf+len, max-len, whole);
547 return len;
548}
549
550
551/** print %g */
552static void
553print_num_g(char** at, size_t* left, int* ret, double value,
554 int minw, int precision, int prgiven, int zeropad, int minus,
555 int plus, int space)
556{
557 char buf[PRINT_FLOAT_BUFSZ];
558 int negative = (value < 0);
559 int zero = 0;
560 int len;
561 if(!prgiven) precision = 6;
562 if(precision == 0) precision = 1;
563 len = print_float_g(buf, (int)sizeof(buf), negative?-value:value,
564 precision);
565 print_num(at, left, ret, minw, 1, 0, zeropad, minus,
566 plus, space, zero, negative, buf, len);
567}
568
569
570/** strnlen (compat implementation) */
571static int
572my_strnlen(const char* s, int max)
573{
574 int i;
575 for(i=0; i<max; i++)
576 if(s[i]==0)
577 return i;
578 return max;
579}
580
581/** print %s */
582static void
583print_str(char** at, size_t* left, int* ret, char* s,
584 int minw, int precision, int prgiven, int minus)
585{
586 int w;
587 /* with prec: no more than x characters from this string, stop at 0 */
588 if(prgiven)
589 w = my_strnlen(s, precision);
590 else w = (int)strlen(s); /* up to the nul */
591 if(w < minw && !minus)
592 print_pad(at, left, ret, ' ', minw - w);
593 spool_str(at, left, ret, s, w);
594 if(w < minw && minus)
595 print_pad(at, left, ret, ' ', minw - w);
596}
597
598/** print %c */
599static void
600print_char(char** at, size_t* left, int* ret, int c,
601 int minw, int minus)
602{
603 if(1 < minw && !minus)
604 print_pad(at, left, ret, ' ', minw - 1);
605 print_pad(at, left, ret, c, 1);
606 if(1 < minw && minus)
607 print_pad(at, left, ret, ' ', minw - 1);
608}
609
610
611/**
612 * Print to string.
613 * str: string buffer for result. result will be null terminated.
614 * size: size of the buffer. null is put inside buffer.
615 * format: printf format string.
616 * arg: '...' arguments to print.
617 * returns number of characters. a null is printed after this.
618 * return number of bytes that would have been written
619 * if the buffer had been large enough.
620 *
621 * supported format specifiers:
622 * %s, %u, %d, %x, %i, %f, %g, %c, %p, %n.
623 * length: l, ll (for d, u, x).
624 * precision: 6.6d (for d, u, x)
625 * %f, %g precisions, 0.3f
626 * %20s, '.*s'
627 * and %%.
628 */
629int vsnprintf(char* str, size_t size, const char* format, va_list arg)
630{
631 char* at = str;
632 size_t left = size;
633 int ret = 0;
634 const char* fmt = format;
635 int conv, minw, precision, prgiven, zeropad, minus, plus, space, length;
636 while(*fmt) {
637 /* copy string before % */
638 while(*fmt && *fmt!='%') {
639 if(left > 1) {
640 *at++ = *fmt++;
641 left--;
642 } else fmt++;
643 ret++;
644 }
645
646 /* see if we are at end */
647 if(!*fmt) break;
648
649 /* fetch next argument % designation from format string */
650 fmt++; /* skip the '%' */
651
652 /********************************/
653 /* get the argument designation */
654 /********************************/
655 /* we must do this vararg stuff inside this function for
656 * portability. Hence, get_designation, and print_designation
657 * are not their own functions. */
658
659 /* printout designation:
660 * conversion specifier: x, d, u, s, c, n, m, p
661 * flags: # not supported
662 * 0 zeropad (on the left)
663 * - left adjust (right by default)
664 * ' ' printspace for positive number (in - position).
665 * + alwayssign
666 * fieldwidth: [1-9][0-9]* minimum field width.
667 * if this is * then type int next argument specifies the minwidth.
668 * if this is negative, the - flag is set (with positive width).
669 * precision: period[digits]*, %.2x.
670 * if this is * then type int next argument specifies the precision.
671 * just '.' or negative value means precision=0.
672 * this is mindigits to print for d, i, u, x
673 * this is aftercomma digits for f
674 * this is max number significant digits for g
675 * maxnumber characters to be printed for s
676 * length: 0-none (int), 1-l (long), 2-ll (long long)
677 * notsupported: hh (char), h (short), L (long double), q, j, z, t
678 * Does not support %m$ and *m$ argument designation as array indices.
679 * Does not support %#x
680 *
681 */
682 minw = 0;
683 precision = 1;
684 prgiven = 0;
685 zeropad = 0;
686 minus = 0;
687 plus = 0;
688 space = 0;
689 length = 0;
690
691 /* get flags in any order */
692 for(;;) {
693 if(*fmt == '0')
694 zeropad = 1;
695 else if(*fmt == '-')
696 minus = 1;
697 else if(*fmt == '+')
698 plus = 1;
699 else if(*fmt == ' ')
700 space = 1;
701 else break;
702 fmt++;
703 }
704
705 /* field width */
706 if(*fmt == '*') {
707 fmt++; /* skip char */
708 minw = va_arg(arg, int);
709 if(minw < 0) {
710 minus = 1;
711 minw = -minw;
712 }
713 } else while(*fmt >= '0' && *fmt <= '9') {
714 minw = minw*10 + (*fmt++)-'0';
715 }
716
717 /* precision */
718 if(*fmt == '.') {
719 fmt++; /* skip period */
720 prgiven = 1;
721 precision = 0;
722 if(*fmt == '*') {
723 fmt++; /* skip char */
724 precision = va_arg(arg, int);
725 if(precision < 0)
726 precision = 0;
727 } else while(*fmt >= '0' && *fmt <= '9') {
728 precision = precision*10 + (*fmt++)-'0';
729 }
730 }
731
732 /* length */
733 if(*fmt == 'l') {
734 fmt++; /* skip char */
735 length = 1;
736 if(*fmt == 'l') {
737 fmt++; /* skip char */
738 length = 2;
739 }
740 }
741
742 /* get the conversion */
743 if(!*fmt) conv = 0;
744 else conv = *fmt++;
745
746 /***********************************/
747 /* print that argument designation */
748 /***********************************/
749 switch(conv) {
750 case 'i':
751 case 'd':
752 if(length == 0)
753 print_num_d(&at, &left, &ret, va_arg(arg, int),
754 minw, precision, prgiven, zeropad, minus, plus, space);
755 else if(length == 1)
756 print_num_ld(&at, &left, &ret, va_arg(arg, long),
757 minw, precision, prgiven, zeropad, minus, plus, space);
758 else if(length == 2)
759 print_num_lld(&at, &left, &ret,
760 va_arg(arg, long long),
761 minw, precision, prgiven, zeropad, minus, plus, space);
762 break;
763 case 'u':
764 if(length == 0)
765 print_num_u(&at, &left, &ret,
766 va_arg(arg, unsigned int),
767 minw, precision, prgiven, zeropad, minus, plus, space);
768 else if(length == 1)
769 print_num_lu(&at, &left, &ret,
770 va_arg(arg, unsigned long),
771 minw, precision, prgiven, zeropad, minus, plus, space);
772 else if(length == 2)
773 print_num_llu(&at, &left, &ret,
774 va_arg(arg, unsigned long long),
775 minw, precision, prgiven, zeropad, minus, plus, space);
776 break;
777 case 'x':
778 if(length == 0)
779 print_num_x(&at, &left, &ret,
780 va_arg(arg, unsigned int),
781 minw, precision, prgiven, zeropad, minus, plus, space);
782 else if(length == 1)
783 print_num_lx(&at, &left, &ret,
784 va_arg(arg, unsigned long),
785 minw, precision, prgiven, zeropad, minus, plus, space);
786 else if(length == 2)
787 print_num_llx(&at, &left, &ret,
788 va_arg(arg, unsigned long long),
789 minw, precision, prgiven, zeropad, minus, plus, space);
790 break;
791 case 's':
792 print_str(&at, &left, &ret, va_arg(arg, char*),
793 minw, precision, prgiven, minus);
794 break;
795 case 'c':
796 print_char(&at, &left, &ret, va_arg(arg, int),
797 minw, minus);
798 break;
799 case 'n':
800 *va_arg(arg, int*) = ret;
801 break;
802 case 'm':
803 print_str(&at, &left, &ret, strerror(errno),
804 minw, precision, prgiven, minus);
805 break;
806 case 'p':
807 print_num_llp(&at, &left, &ret, va_arg(arg, void*),
808 minw, precision, prgiven, zeropad, minus, plus, space);
809 break;
810 case '%':
811 print_pad(&at, &left, &ret, '%', 1);
812 break;
813 case 'f':
814 print_num_f(&at, &left, &ret, va_arg(arg, double),
815 minw, precision, prgiven, zeropad, minus, plus, space);
816 break;
817 case 'g':
818 print_num_g(&at, &left, &ret, va_arg(arg, double),
819 minw, precision, prgiven, zeropad, minus, plus, space);
820 break;
821 /* unknown */
822 default:
823 case 0: break;
824 }
825 }
826
827 /* zero terminate */
828 if(left > 0)
829 *at = 0;
830 return ret;
831}
832
833#ifdef SNPRINTF_TEST
834
835/** do tests */
836#undef snprintf
837#define DOTEST(bufsz, result, retval, ...) do { \
838 char buf[bufsz]; \
839 printf("now test %s\n", #__VA_ARGS__); \
840 int r=my_snprintf(buf, sizeof(buf), __VA_ARGS__); \
841 if(r != retval || strcmp(buf, result) != 0) { \
842 printf("error test(%s) was \"%s\":%d\n", \
843 ""#bufsz", "#result", "#retval", "#__VA_ARGS__, \
844 buf, r); \
845 exit(1); \
846 } \
847 r=snprintf(buf, sizeof(buf), __VA_ARGS__); \
848 if(r != retval || strcmp(buf, result) != 0) { \
849 printf("error test(%s) differs with system, \"%s\":%d\n", \
850 ""#bufsz", "#result", "#retval", "#__VA_ARGS__, \
851 buf, r); \
852 exit(1); \
853 } \
854 printf("test(\"%s\":%d) passed\n", buf, r); \
855 } while(0);
856
857/** test program */
858int main(void)
859{
860 int x = 0;
861
862 /* bufsize, expectedstring, expectedretval, snprintf arguments */
863 DOTEST(1024, "hello", 5, "hello");
864 DOTEST(1024, "h", 1, "h");
865 /* warning from gcc for format string, but it does work
866 * DOTEST(1024, "", 0, ""); */
867
868 DOTEST(3, "he", 5, "hello");
869 DOTEST(1, "", 7, "%d", 7823089);
870
871 /* test positive numbers */
872 DOTEST(1024, "0", 1, "%d", 0);
873 DOTEST(1024, "1", 1, "%d", 1);
874 DOTEST(1024, "9", 1, "%d", 9);
875 DOTEST(1024, "15", 2, "%d", 15);
876 DOTEST(1024, "ab15cd", 6, "ab%dcd", 15);
877 DOTEST(1024, "167", 3, "%d", 167);
878 DOTEST(1024, "7823089", 7, "%d", 7823089);
879 DOTEST(1024, " 12", 3, "%3d", 12);
880 DOTEST(1024, "012", 3, "%.3d", 12);
881 DOTEST(1024, "012", 3, "%3.3d", 12);
882 DOTEST(1024, "012", 3, "%03d", 12);
883 DOTEST(1024, " 012", 4, "%4.3d", 12);
884 DOTEST(1024, "", 0, "%.0d", 0);
885
886 /* test negative numbers */
887 DOTEST(1024, "-1", 2, "%d", -1);
888 DOTEST(1024, "-12", 3, "%3d", -12);
889 DOTEST(1024, " -2", 3, "%3d", -2);
890 DOTEST(1024, "-012", 4, "%.3d", -12);
891 DOTEST(1024, "-012", 4, "%3.3d", -12);
892 DOTEST(1024, "-012", 4, "%4.3d", -12);
893 DOTEST(1024, " -012", 5, "%5.3d", -12);
894 DOTEST(1024, "-12", 3, "%03d", -12);
895 DOTEST(1024, "-02", 3, "%03d", -2);
896 DOTEST(1024, "-15", 3, "%d", -15);
897 DOTEST(1024, "-7307", 5, "%d", -7307);
898 DOTEST(1024, "-12 ", 5, "%-5d", -12);
899 DOTEST(1024, "-00012", 6, "%-.5d", -12);
900
901 /* test + and space flags */
902 DOTEST(1024, "+12", 3, "%+d", 12);
903 DOTEST(1024, " 12", 3, "% d", 12);
904
905 /* test %u */
906 DOTEST(1024, "12", 2, "%u", 12);
907 DOTEST(1024, "0", 1, "%u", 0);
908 DOTEST(1024, "4294967295", 10, "%u", 0xffffffff);
909
910 /* test %x */
911 DOTEST(1024, "0", 1, "%x", 0);
912 DOTEST(1024, "c", 1, "%x", 12);
913 DOTEST(1024, "12ab34cd", 8, "%x", 0x12ab34cd);
914
915 /* test %llu, %lld */
916 DOTEST(1024, "18446744073709551615", 20, "%llu",
917 (long long)0xffffffffffffffff);
918 DOTEST(1024, "-9223372036854775808", 20, "%lld",
919 (long long)0x8000000000000000);
920 DOTEST(1024, "9223372036854775808", 19, "%llu",
921 (long long)0x8000000000000000);
922
923 /* test %s */
924 DOTEST(1024, "hello", 5, "%s", "hello");
925 DOTEST(1024, " hello", 10, "%10s", "hello");
926 DOTEST(1024, "hello ", 10, "%-10s", "hello");
927 DOTEST(1024, "he", 2, "%.2s", "hello");
928 DOTEST(1024, " he", 4, "%4.2s", "hello");
929 DOTEST(1024, " h", 4, "%4.2s", "h");
930
931 /* test %c */
932 DOTEST(1024, "a", 1, "%c", 'a');
933 /* warning from gcc for format string, but it does work
934 DOTEST(1024, " a", 5, "%5c", 'a');
935 DOTEST(1024, "a", 1, "%.0c", 'a'); */
936
937 /* test %n */
938 DOTEST(1024, "hello", 5, "hello%n", &x);
939 if(x != 5) { printf("the %%n failed\n"); exit(1); }
940
941 /* test %m */
942 errno = 0;
943 DOTEST(1024, "Success", 7, "%m");
944
945 /* test %p */
946 DOTEST(1024, "0x10", 4, "%p", (void*)0x10);
947 DOTEST(1024, "(nil)", 5, "%p", (void*)0x0);
948
949 /* test %% */
950 DOTEST(1024, "%", 1, "%%");
951
952 /* test %f */
953 DOTEST(1024, "0.000000", 8, "%f", 0.0);
954 DOTEST(1024, "0.00", 4, "%.2f", 0.0);
955 /* differs, "-0.00" DOTEST(1024, "0.00", 4, "%.2f", -0.0); */
956 DOTEST(1024, "234.00", 6, "%.2f", 234.005);
957 DOTEST(1024, "8973497.1246", 12, "%.4f", 8973497.12456);
958 DOTEST(1024, "-12.000000", 10, "%f", -12.0);
959 DOTEST(1024, "6", 1, "%.0f", 6.0);
960
961 DOTEST(1024, "6", 1, "%g", 6.0);
962 DOTEST(1024, "6.1", 3, "%g", 6.1);
963 DOTEST(1024, "6.15", 4, "%g", 6.15);
964
965 /* These format strings are from the code of NSD, Unbound, ldns */
966
967 DOTEST(1024, "abcdef", 6, "%s", "abcdef");
968 DOTEST(1024, "005", 3, "%03u", 5);
969 DOTEST(1024, "12345", 5, "%03u", 12345);
970 DOTEST(1024, "5", 1, "%d", 5);
971 DOTEST(1024, "(nil)", 5, "%p", NULL);
972 DOTEST(1024, "12345", 5, "%ld", (long)12345);
973 DOTEST(1024, "12345", 5, "%lu", (long)12345);
974 DOTEST(1024, " 12345", 12, "%12u", (unsigned)12345);
975 DOTEST(1024, "12345", 5, "%u", (unsigned)12345);
976 DOTEST(1024, "12345", 5, "%llu", (unsigned long long)12345);
977 DOTEST(1024, "12345", 5, "%x", 0x12345);
978 DOTEST(1024, "12345", 5, "%llx", (long long)0x12345);
979 DOTEST(1024, "012345", 6, "%6.6d", 12345);
980 DOTEST(1024, "012345", 6, "%6.6u", 12345);
981 DOTEST(1024, "1234.54", 7, "%g", 1234.54);
982 DOTEST(1024, "123456789.54", 12, "%.12g", 123456789.54);
983 DOTEST(1024, "3456789123456.54", 16, "%.16g", 3456789123456.54);
984 /* %24g does not work with 24 digits, not enough accuracy,
985 * the first 16 digits are correct */
986 DOTEST(1024, "12345", 5, "%3.3d", 12345);
987 DOTEST(1024, "000", 3, "%3.3d", 0);
988 DOTEST(1024, "001", 3, "%3.3d", 1);
989 DOTEST(1024, "012", 3, "%3.3d", 12);
990 DOTEST(1024, "-012", 4, "%3.3d", -12);
991 DOTEST(1024, "he", 2, "%.2s", "hello");
992 DOTEST(1024, "helloworld", 10, "%s%s", "hello", "world");
993 DOTEST(1024, "he", 2, "%.*s", 2, "hello");
994 DOTEST(1024, " hello", 7, "%*s", 7, "hello");
995 DOTEST(1024, "hello ", 7, "%*s", -7, "hello");
996 DOTEST(1024, "0", 1, "%c", '0');
997 DOTEST(1024, "A", 1, "%c", 'A');
998 DOTEST(1024, "", 1, "%c", 0);
999 DOTEST(1024, "\010", 1, "%c", 8);
1000 DOTEST(1024, "%", 1, "%%");
1001 DOTEST(1024, "0a", 2, "%02x", 0x0a);
1002 DOTEST(1024, "bd", 2, "%02x", 0xbd);
1003 DOTEST(1024, "12", 2, "%02ld", (long)12);
1004 DOTEST(1024, "02", 2, "%02ld", (long)2);
1005 DOTEST(1024, "02", 2, "%02u", (unsigned)2);
1006 DOTEST(1024, "765432", 6, "%05u", (unsigned)765432);
1007 DOTEST(1024, "10.234", 6, "%0.3f", 10.23421);
1008 DOTEST(1024, "123456.234", 10, "%0.3f", 123456.23421);
1009 DOTEST(1024, "123456789.234", 13, "%0.3f", 123456789.23421);
1010 DOTEST(1024, "123456.23", 9, "%.2f", 123456.23421);
1011 DOTEST(1024, "123456", 6, "%.0f", 123456.23421);
1012 DOTEST(1024, "0123", 4, "%.4x", 0x0123);
1013 DOTEST(1024, "00000123", 8, "%.8x", 0x0123);
1014 DOTEST(1024, "ffeb0cde", 8, "%.8x", 0xffeb0cde);
1015 DOTEST(1024, " 987654321", 10, "%10lu", (unsigned long)987654321);
1016 DOTEST(1024, " 987654321", 12, "%12lu", (unsigned long)987654321);
1017 DOTEST(1024, "987654321", 9, "%i", 987654321);
1018 DOTEST(1024, "-87654321", 9, "%i", -87654321);
1019 DOTEST(1024, "hello ", 16, "%-16s", "hello");
1020 DOTEST(1024, " ", 16, "%-16s", "");
1021 DOTEST(1024, "a ", 16, "%-16s", "a");
1022 DOTEST(1024, "foobarfoobar ", 16, "%-16s", "foobarfoobar");
1023 DOTEST(1024, "foobarfoobarfoobar", 18, "%-16s", "foobarfoobarfoobar");
1024
1025 /* combined expressions */
1026 DOTEST(1024, "foo 1.0 size 512 edns", 21,
1027 "foo %s size %d %s%s", "1.0", 512, "", "edns");
1028 DOTEST(15, "foo 1.0 size 5", 21,
1029 "foo %s size %d %s%s", "1.0", 512, "", "edns");
1030 DOTEST(1024, "packet 1203ceff id", 18,
1031 "packet %2.2x%2.2x%2.2x%2.2x id", 0x12, 0x03, 0xce, 0xff);
1032 DOTEST(1024, "/tmp/testbound_123abcd.tmp", 26, "/tmp/testbound_%u%s%s.tmp", 123, "ab", "cd");
1033
1034 return 0;
1035}
1036#endif /* SNPRINTF_TEST */