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  1. /*
  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
  6. */
  7.  
  8. /**************************************************************
  9. * Original:
  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...
  14. *
  15. * snprintf() is used instead of sprintf() as it does limit checks
  16. * for string length. This covers a nasty loophole.
  17. *
  18. * The other functions are there to prevent NULL pointers from
  19. * causing nast effects.
  20. *
  21. * More Recently:
  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.
  27. *
  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.
  38. *
  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.
  42. *
  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.
  47. *
  48. * Andrew Tridgell (tridge@samba.org) Oct 1998
  49. * fixed handling of %.0f
  50. * added test for HAVE_LONG_DOUBLE
  51. *
  52. * tridge@samba.org, idra@samba.org, April 2001
  53. * got rid of fcvt code (twas buggy and made testing harder)
  54. * added C99 semantics
  55. *
  56. * date: 2002/12/19 19:56:31; author: herb; state: Exp; lines: +2 -0
  57. * actually print args for %g and %e
  58. *
  59. * date: 2002/06/03 13:37:52; author: jmcd; state: Exp; lines: +8 -0
  60. * Since includes.h isn't included here, VA_COPY has to be defined here. I don't
  61. * see any include file that is guaranteed to be here, so I'm defining it
  62. * locally. Fixes AIX and Solaris builds.
  63. *
  64. * date: 2002/06/03 03:07:24; author: tridge; state: Exp; lines: +5 -13
  65. * put the ifdef for HAVE_VA_COPY in one place rather than in lots of
  66. * functions
  67. *
  68. * date: 2002/05/17 14:51:22; author: jmcd; state: Exp; lines: +21 -4
  69. * Fix usage of va_list passed as an arg. Use __va_copy before using it
  70. * when it exists.
  71. *
  72. * date: 2002/04/16 22:38:04; author: idra; state: Exp; lines: +20 -14
  73. * Fix incorrect zpadlen handling in fmtfp.
  74. * Thanks to Ollie Oldham <ollie.oldham@metro-optix.com> for spotting it.
  75. * few mods to make it easier to compile the tests.
  76. * addedd the "Ollie" test to the floating point ones.
  77. *
  78. * Martin Pool (mbp@samba.org) April 2003
  79. * Remove NO_CONFIG_H so that the test case can be built within a source
  80. * tree with less trouble.
  81. * Remove unnecessary SAFE_FREE() definition.
  82. *
  83. * Martin Pool (mbp@samba.org) May 2003
  84. * Put in a prototype for dummy_snprintf() to quiet compiler warnings.
  85. *
  86. * Move #endif to make sure VA_COPY, LDOUBLE, etc are defined even
  87. * if the C library has some snprintf functions already.
  88. *
  89. * Damien Miller (djm@mindrot.org) Jan 2007
  90. * Fix integer overflows in return value.
  91. * Make formatting quite a bit faster by inlining dopr_outch()
  92. *
  93. **************************************************************/
  94.  
  95. #include "includes.h"
  96.  
  97. #if defined(BROKEN_SNPRINTF) /* For those with broken snprintf() */
  98. # undef HAVE_SNPRINTF
  99. # undef HAVE_VSNPRINTF
  100. #endif
  101.  
  102. #ifndef VA_COPY
  103. # ifdef HAVE_VA_COPY
  104. # define VA_COPY(dest, src) va_copy(dest, src)
  105. # else
  106. # ifdef HAVE___VA_COPY
  107. # define VA_COPY(dest, src) __va_copy(dest, src)
  108. # else
  109. # define VA_COPY(dest, src) (dest) = (src)
  110. # endif
  111. # endif
  112. #endif
  113.  
  114. #if !defined(HAVE_SNPRINTF) || !defined(HAVE_VSNPRINTF)
  115.  
  116. #include <ctype.h>
  117. #include <stdarg.h>
  118. #include <stdlib.h>
  119. #include <string.h>
  120. #include <limits.h>
  121. #include <errno.h>
  122.  
  123. #ifdef HAVE_LONG_DOUBLE
  124. # define LDOUBLE long double
  125. #else
  126. # define LDOUBLE double
  127. #endif
  128.  
  129. #ifdef HAVE_LONG_LONG
  130. # define LLONG long long
  131. #else
  132. # define LLONG long
  133. #endif
  134.  
  135. /*
  136. * dopr(): poor man's version of doprintf
  137. */
  138.  
  139. /* format read states */
  140. #define DP_S_DEFAULT 0
  141. #define DP_S_FLAGS 1
  142. #define DP_S_MIN 2
  143. #define DP_S_DOT 3
  144. #define DP_S_MAX 4
  145. #define DP_S_MOD 5
  146. #define DP_S_CONV 6
  147. #define DP_S_DONE 7
  148.  
  149. /* format flags - Bits */
  150. #define DP_F_MINUS (1 << 0)
  151. #define DP_F_PLUS (1 << 1)
  152. #define DP_F_SPACE (1 << 2)
  153. #define DP_F_NUM (1 << 3)
  154. #define DP_F_ZERO (1 << 4)
  155. #define DP_F_UP (1 << 5)
  156. #define DP_F_UNSIGNED (1 << 6)
  157.  
  158. /* Conversion Flags */
  159. #define DP_C_SHORT 1
  160. #define DP_C_LONG 2
  161. #define DP_C_LDOUBLE 3
  162. #define DP_C_LLONG 4
  163.  
  164. #define char_to_int(p) ((p)- '0')
  165. #ifndef MAX
  166. # define MAX(p,q) (((p) >= (q)) ? (p) : (q))
  167. #endif
  168.  
  169. #define DOPR_OUTCH(buf, pos, buflen, thechar) \
  170. do { \
  171. if (pos + 1 >= INT_MAX) { \
  172. errno = ERANGE; \
  173. return -1; \
  174. } \
  175. if (pos < buflen) \
  176. buf[pos] = thechar; \
  177. (pos)++; \
  178. } while (0)
  179.  
  180. static int dopr(char *buffer, size_t maxlen, const char *format,
  181. va_list args_in);
  182. static int fmtstr(char *buffer, size_t *currlen, size_t maxlen,
  183. char *value, int flags, int min, int max);
  184. static int fmtint(char *buffer, size_t *currlen, size_t maxlen,
  185. LLONG value, int base, int min, int max, int flags);
  186. static int fmtfp(char *buffer, size_t *currlen, size_t maxlen,
  187. LDOUBLE fvalue, int min, int max, int flags);
  188.  
  189. static int
  190. dopr(char *buffer, size_t maxlen, const char *format, va_list args_in)
  191. {
  192. char ch;
  193. LLONG value;
  194. LDOUBLE fvalue;
  195. char *strvalue;
  196. int min;
  197. int max;
  198. int state;
  199. int flags;
  200. int cflags;
  201. size_t currlen;
  202. va_list args;
  203.  
  204. VA_COPY(args, args_in);
  205.  
  206. state = DP_S_DEFAULT;
  207. currlen = flags = cflags = min = 0;
  208. max = -1;
  209. ch = *format++;
  210.  
  211. while (state != DP_S_DONE) {
  212. if (ch == '\0')
  213. state = DP_S_DONE;
  214.  
  215. switch(state) {
  216. case DP_S_DEFAULT:
  217. if (ch == '%')
  218. state = DP_S_FLAGS;
  219. else
  220. DOPR_OUTCH(buffer, currlen, maxlen, ch);
  221. ch = *format++;
  222. break;
  223. case DP_S_FLAGS:
  224. switch (ch) {
  225. case '-':
  226. flags |= DP_F_MINUS;
  227. ch = *format++;
  228. break;
  229. case '+':
  230. flags |= DP_F_PLUS;
  231. ch = *format++;
  232. break;
  233. case ' ':
  234. flags |= DP_F_SPACE;
  235. ch = *format++;
  236. break;
  237. case '#':
  238. flags |= DP_F_NUM;
  239. ch = *format++;
  240. break;
  241. case '0':
  242. flags |= DP_F_ZERO;
  243. ch = *format++;
  244. break;
  245. default:
  246. state = DP_S_MIN;
  247. break;
  248. }
  249. break;
  250. case DP_S_MIN:
  251. if (isdigit((unsigned char)ch)) {
  252. min = 10*min + char_to_int (ch);
  253. ch = *format++;
  254. } else if (ch == '*') {
  255. min = va_arg (args, int);
  256. ch = *format++;
  257. state = DP_S_DOT;
  258. } else {
  259. state = DP_S_DOT;
  260. }
  261. break;
  262. case DP_S_DOT:
  263. if (ch == '.') {
  264. state = DP_S_MAX;
  265. ch = *format++;
  266. } else {
  267. state = DP_S_MOD;
  268. }
  269. break;
  270. case DP_S_MAX:
  271. if (isdigit((unsigned char)ch)) {
  272. if (max < 0)
  273. max = 0;
  274. max = 10*max + char_to_int (ch);
  275. ch = *format++;
  276. } else if (ch == '*') {
  277. max = va_arg (args, int);
  278. ch = *format++;
  279. state = DP_S_MOD;
  280. } else {
  281. state = DP_S_MOD;
  282. }
  283. break;
  284. case DP_S_MOD:
  285. switch (ch) {
  286. case 'h':
  287. cflags = DP_C_SHORT;
  288. ch = *format++;
  289. break;
  290. case 'l':
  291. cflags = DP_C_LONG;
  292. ch = *format++;
  293. if (ch == 'l') { /* It's a long long */
  294. cflags = DP_C_LLONG;
  295. ch = *format++;
  296. }
  297. break;
  298. case 'L':
  299. cflags = DP_C_LDOUBLE;
  300. ch = *format++;
  301. break;
  302. default:
  303. break;
  304. }
  305. state = DP_S_CONV;
  306. break;
  307. case DP_S_CONV:
  308. switch (ch) {
  309. case 'd':
  310. case 'i':
  311. if (cflags == DP_C_SHORT)
  312. value = va_arg (args, int);
  313. else if (cflags == DP_C_LONG)
  314. value = va_arg (args, long int);
  315. else if (cflags == DP_C_LLONG)
  316. value = va_arg (args, LLONG);
  317. else
  318. value = va_arg (args, int);
  319. if (fmtint(buffer, &currlen, maxlen,
  320. value, 10, min, max, flags) == -1)
  321. return -1;
  322. break;
  323. case 'o':
  324. flags |= DP_F_UNSIGNED;
  325. if (cflags == DP_C_SHORT)
  326. value = va_arg (args, unsigned int);
  327. else if (cflags == DP_C_LONG)
  328. value = (long)va_arg (args, unsigned long int);
  329. else if (cflags == DP_C_LLONG)
  330. value = (long)va_arg (args, unsigned LLONG);
  331. else
  332. value = (long)va_arg (args, unsigned int);
  333. if (fmtint(buffer, &currlen, maxlen, value,
  334. 8, min, max, flags) == -1)
  335. return -1;
  336. break;
  337. case 'u':
  338. flags |= DP_F_UNSIGNED;
  339. if (cflags == DP_C_SHORT)
  340. value = va_arg (args, unsigned int);
  341. else if (cflags == DP_C_LONG)
  342. value = (long)va_arg (args, unsigned long int);
  343. else if (cflags == DP_C_LLONG)
  344. value = (LLONG)va_arg (args, unsigned LLONG);
  345. else
  346. value = (long)va_arg (args, unsigned int);
  347. if (fmtint(buffer, &currlen, maxlen, value,
  348. 10, min, max, flags) == -1)
  349. return -1;
  350. break;
  351. case 'X':
  352. flags |= DP_F_UP;
  353. case 'x':
  354. flags |= DP_F_UNSIGNED;
  355. if (cflags == DP_C_SHORT)
  356. value = va_arg (args, unsigned int);
  357. else if (cflags == DP_C_LONG)
  358. value = (long)va_arg (args, unsigned long int);
  359. else if (cflags == DP_C_LLONG)
  360. value = (LLONG)va_arg (args, unsigned LLONG);
  361. else
  362. value = (long)va_arg (args, unsigned int);
  363. if (fmtint(buffer, &currlen, maxlen, value,
  364. 16, min, max, flags) == -1)
  365. return -1;
  366. break;
  367. case 'f':
  368. if (cflags == DP_C_LDOUBLE)
  369. fvalue = va_arg (args, LDOUBLE);
  370. else
  371. fvalue = va_arg (args, double);
  372. if (fmtfp(buffer, &currlen, maxlen, fvalue,
  373. min, max, flags) == -1)
  374. return -1;
  375. break;
  376. case 'E':
  377. flags |= DP_F_UP;
  378. case 'e':
  379. if (cflags == DP_C_LDOUBLE)
  380. fvalue = va_arg (args, LDOUBLE);
  381. else
  382. fvalue = va_arg (args, double);
  383. if (fmtfp(buffer, &currlen, maxlen, fvalue,
  384. min, max, flags) == -1)
  385. return -1;
  386. break;
  387. case 'G':
  388. flags |= DP_F_UP;
  389. case 'g':
  390. if (cflags == DP_C_LDOUBLE)
  391. fvalue = va_arg (args, LDOUBLE);
  392. else
  393. fvalue = va_arg (args, double);
  394. if (fmtfp(buffer, &currlen, maxlen, fvalue,
  395. min, max, flags) == -1)
  396. return -1;
  397. break;
  398. case 'c':
  399. DOPR_OUTCH(buffer, currlen, maxlen,
  400. va_arg (args, int));
  401. break;
  402. case 's':
  403. strvalue = va_arg (args, char *);
  404. if (!strvalue) strvalue = "(NULL)";
  405. if (max == -1) {
  406. max = strlen(strvalue);
  407. }
  408. if (min > 0 && max >= 0 && min > max) max = min;
  409. if (fmtstr(buffer, &currlen, maxlen,
  410. strvalue, flags, min, max) == -1)
  411. return -1;
  412. break;
  413. case 'p':
  414. strvalue = va_arg (args, void *);
  415. if (fmtint(buffer, &currlen, maxlen,
  416. (long) strvalue, 16, min, max, flags) == -1)
  417. return -1;
  418. break;
  419. case 'n':
  420. if (cflags == DP_C_SHORT) {
  421. short int *num;
  422. num = va_arg (args, short int *);
  423. *num = currlen;
  424. } else if (cflags == DP_C_LONG) {
  425. long int *num;
  426. num = va_arg (args, long int *);
  427. *num = (long int)currlen;
  428. } else if (cflags == DP_C_LLONG) {
  429. LLONG *num;
  430. num = va_arg (args, LLONG *);
  431. *num = (LLONG)currlen;
  432. } else {
  433. int *num;
  434. num = va_arg (args, int *);
  435. *num = currlen;
  436. }
  437. break;
  438. case '%':
  439. DOPR_OUTCH(buffer, currlen, maxlen, ch);
  440. break;
  441. case 'w':
  442. /* not supported yet, treat as next char */
  443. ch = *format++;
  444. break;
  445. default:
  446. /* Unknown, skip */
  447. break;
  448. }
  449. ch = *format++;
  450. state = DP_S_DEFAULT;
  451. flags = cflags = min = 0;
  452. max = -1;
  453. break;
  454. case DP_S_DONE:
  455. break;
  456. default:
  457. /* hmm? */
  458. break; /* some picky compilers need this */
  459. }
  460. }
  461. if (maxlen != 0) {
  462. if (currlen < maxlen - 1)
  463. buffer[currlen] = '\0';
  464. else if (maxlen > 0)
  465. buffer[maxlen - 1] = '\0';
  466. }
  467.  
  468. return currlen < INT_MAX ? (int)currlen : -1;
  469. }
  470.  
  471. static int
  472. fmtstr(char *buffer, size_t *currlen, size_t maxlen,
  473. char *value, int flags, int min, int max)
  474. {
  475. int padlen, strln; /* amount to pad */
  476. int cnt = 0;
  477.  
  478. #ifdef DEBUG_SNPRINTF
  479. printf("fmtstr min=%d max=%d s=[%s]\n", min, max, value);
  480. #endif
  481. if (value == 0) {
  482. value = "<NULL>";
  483. }
  484.  
  485. for (strln = 0; strln < max && value[strln]; ++strln); /* strlen */
  486. padlen = min - strln;
  487. if (padlen < 0)
  488. padlen = 0;
  489. if (flags & DP_F_MINUS)
  490. padlen = -padlen; /* Left Justify */
  491.  
  492. while ((padlen > 0) && (cnt < max)) {
  493. DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
  494. --padlen;
  495. ++cnt;
  496. }
  497. while (*value && (cnt < max)) {
  498. DOPR_OUTCH(buffer, *currlen, maxlen, *value);
  499. *value++;
  500. ++cnt;
  501. }
  502. while ((padlen < 0) && (cnt < max)) {
  503. DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
  504. ++padlen;
  505. ++cnt;
  506. }
  507. return 0;
  508. }
  509.  
  510. /* Have to handle DP_F_NUM (ie 0x and 0 alternates) */
  511.  
  512. static int
  513. fmtint(char *buffer, size_t *currlen, size_t maxlen,
  514. LLONG value, int base, int min, int max, int flags)
  515. {
  516. int signvalue = 0;
  517. unsigned LLONG uvalue;
  518. char convert[20];
  519. int place = 0;
  520. int spadlen = 0; /* amount to space pad */
  521. int zpadlen = 0; /* amount to zero pad */
  522. int caps = 0;
  523.  
  524. if (max < 0)
  525. max = 0;
  526.  
  527. uvalue = value;
  528.  
  529. if(!(flags & DP_F_UNSIGNED)) {
  530. if( value < 0 ) {
  531. signvalue = '-';
  532. uvalue = -value;
  533. } else {
  534. if (flags & DP_F_PLUS) /* Do a sign (+/i) */
  535. signvalue = '+';
  536. else if (flags & DP_F_SPACE)
  537. signvalue = ' ';
  538. }
  539. }
  540.  
  541. if (flags & DP_F_UP) caps = 1; /* Should characters be upper case? */
  542.  
  543. do {
  544. convert[place++] =
  545. (caps? "0123456789ABCDEF":"0123456789abcdef")
  546. [uvalue % (unsigned)base ];
  547. uvalue = (uvalue / (unsigned)base );
  548. } while(uvalue && (place < 20));
  549. if (place == 20) place--;
  550. convert[place] = 0;
  551.  
  552. zpadlen = max - place;
  553. spadlen = min - MAX (max, place) - (signvalue ? 1 : 0);
  554. if (zpadlen < 0) zpadlen = 0;
  555. if (spadlen < 0) spadlen = 0;
  556. if (flags & DP_F_ZERO) {
  557. zpadlen = MAX(zpadlen, spadlen);
  558. spadlen = 0;
  559. }
  560. if (flags & DP_F_MINUS)
  561. spadlen = -spadlen; /* Left Justifty */
  562.  
  563. #ifdef DEBUG_SNPRINTF
  564. printf("zpad: %d, spad: %d, min: %d, max: %d, place: %d\n",
  565. zpadlen, spadlen, min, max, place);
  566. #endif
  567.  
  568. /* Spaces */
  569. while (spadlen > 0) {
  570. DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
  571. --spadlen;
  572. }
  573.  
  574. /* Sign */
  575. if (signvalue)
  576. DOPR_OUTCH(buffer, *currlen, maxlen, signvalue);
  577.  
  578. /* Zeros */
  579. if (zpadlen > 0) {
  580. while (zpadlen > 0) {
  581. DOPR_OUTCH(buffer, *currlen, maxlen, '0');
  582. --zpadlen;
  583. }
  584. }
  585.  
  586. /* Digits */
  587. while (place > 0) {
  588. --place;
  589. DOPR_OUTCH(buffer, *currlen, maxlen, convert[place]);
  590. }
  591.  
  592. /* Left Justified spaces */
  593. while (spadlen < 0) {
  594. DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
  595. ++spadlen;
  596. }
  597. return 0;
  598. }
  599.  
  600. static LDOUBLE abs_val(LDOUBLE value)
  601. {
  602. LDOUBLE result = value;
  603.  
  604. if (value < 0)
  605. result = -value;
  606.  
  607. return result;
  608. }
  609.  
  610. static LDOUBLE POW10(int val)
  611. {
  612. LDOUBLE result = 1;
  613.  
  614. while (val) {
  615. result *= 10;
  616. val--;
  617. }
  618.  
  619. return result;
  620. }
  621.  
  622. static LLONG ROUND(LDOUBLE value)
  623. {
  624. LLONG intpart;
  625.  
  626. intpart = (LLONG)value;
  627. value = value - intpart;
  628. if (value >= 0.5) intpart++;
  629.  
  630. return intpart;
  631. }
  632.  
  633. /* a replacement for modf that doesn't need the math library. Should
  634. be portable, but slow */
  635. static double my_modf(double x0, double *iptr)
  636. {
  637. int i;
  638. long l;
  639. double x = x0;
  640. double f = 1.0;
  641.  
  642. for (i=0;i<100;i++) {
  643. l = (long)x;
  644. if (l <= (x+1) && l >= (x-1)) break;
  645. x *= 0.1;
  646. f *= 10.0;
  647. }
  648.  
  649. if (i == 100) {
  650. /*
  651. * yikes! the number is beyond what we can handle.
  652. * What do we do?
  653. */
  654. (*iptr) = 0;
  655. return 0;
  656. }
  657.  
  658. if (i != 0) {
  659. double i2;
  660. double ret;
  661.  
  662. ret = my_modf(x0-l*f, &i2);
  663. (*iptr) = l*f + i2;
  664. return ret;
  665. }
  666.  
  667. (*iptr) = l;
  668. return x - (*iptr);
  669. }
  670.  
  671.  
  672. static int
  673. fmtfp (char *buffer, size_t *currlen, size_t maxlen,
  674. LDOUBLE fvalue, int min, int max, int flags)
  675. {
  676. int signvalue = 0;
  677. double ufvalue;
  678. char iconvert[311];
  679. char fconvert[311];
  680. int iplace = 0;
  681. int fplace = 0;
  682. int padlen = 0; /* amount to pad */
  683. int zpadlen = 0;
  684. int caps = 0;
  685. int idx;
  686. double intpart;
  687. double fracpart;
  688. double temp;
  689.  
  690. /*
  691. * AIX manpage says the default is 0, but Solaris says the default
  692. * is 6, and sprintf on AIX defaults to 6
  693. */
  694. if (max < 0)
  695. max = 6;
  696.  
  697. ufvalue = abs_val (fvalue);
  698.  
  699. if (fvalue < 0) {
  700. signvalue = '-';
  701. } else {
  702. if (flags & DP_F_PLUS) { /* Do a sign (+/i) */
  703. signvalue = '+';
  704. } else {
  705. if (flags & DP_F_SPACE)
  706. signvalue = ' ';
  707. }
  708. }
  709.  
  710. #if 0
  711. if (flags & DP_F_UP) caps = 1; /* Should characters be upper case? */
  712. #endif
  713.  
  714. #if 0
  715. if (max == 0) ufvalue += 0.5; /* if max = 0 we must round */
  716. #endif
  717.  
  718. /*
  719. * Sorry, we only support 16 digits past the decimal because of our
  720. * conversion method
  721. */
  722. if (max > 16)
  723. max = 16;
  724.  
  725. /* We "cheat" by converting the fractional part to integer by
  726. * multiplying by a factor of 10
  727. */
  728.  
  729. temp = ufvalue;
  730. my_modf(temp, &intpart);
  731.  
  732. fracpart = ROUND((POW10(max)) * (ufvalue - intpart));
  733.  
  734. if (fracpart >= POW10(max)) {
  735. intpart++;
  736. fracpart -= POW10(max);
  737. }
  738.  
  739. /* Convert integer part */
  740. do {
  741. temp = intpart*0.1;
  742. my_modf(temp, &intpart);
  743. idx = (int) ((temp -intpart +0.05)* 10.0);
  744. /* idx = (int) (((double)(temp*0.1) -intpart +0.05) *10.0); */
  745. /* printf ("%llf, %f, %x\n", temp, intpart, idx); */
  746. iconvert[iplace++] =
  747. (caps? "0123456789ABCDEF":"0123456789abcdef")[idx];
  748. } while (intpart && (iplace < 311));
  749. if (iplace == 311) iplace--;
  750. iconvert[iplace] = 0;
  751.  
  752. /* Convert fractional part */
  753. if (fracpart)
  754. {
  755. do {
  756. temp = fracpart*0.1;
  757. my_modf(temp, &fracpart);
  758. idx = (int) ((temp -fracpart +0.05)* 10.0);
  759. /* idx = (int) ((((temp/10) -fracpart) +0.05) *10); */
  760. /* printf ("%lf, %lf, %ld\n", temp, fracpart, idx ); */
  761. fconvert[fplace++] =
  762. (caps? "0123456789ABCDEF":"0123456789abcdef")[idx];
  763. } while(fracpart && (fplace < 311));
  764. if (fplace == 311) fplace--;
  765. }
  766. fconvert[fplace] = 0;
  767.  
  768. /* -1 for decimal point, another -1 if we are printing a sign */
  769. padlen = min - iplace - max - 1 - ((signvalue) ? 1 : 0);
  770. zpadlen = max - fplace;
  771. if (zpadlen < 0) zpadlen = 0;
  772. if (padlen < 0)
  773. padlen = 0;
  774. if (flags & DP_F_MINUS)
  775. padlen = -padlen; /* Left Justifty */
  776.  
  777. if ((flags & DP_F_ZERO) && (padlen > 0)) {
  778. if (signvalue) {
  779. DOPR_OUTCH(buffer, *currlen, maxlen, signvalue);
  780. --padlen;
  781. signvalue = 0;
  782. }
  783. while (padlen > 0) {
  784. DOPR_OUTCH(buffer, *currlen, maxlen, '0');
  785. --padlen;
  786. }
  787. }
  788. while (padlen > 0) {
  789. DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
  790. --padlen;
  791. }
  792. if (signvalue)
  793. DOPR_OUTCH(buffer, *currlen, maxlen, signvalue);
  794.  
  795. while (iplace > 0) {
  796. --iplace;
  797. DOPR_OUTCH(buffer, *currlen, maxlen, iconvert[iplace]);
  798. }
  799.  
  800. #ifdef DEBUG_SNPRINTF
  801. printf("fmtfp: fplace=%d zpadlen=%d\n", fplace, zpadlen);
  802. #endif
  803.  
  804. /*
  805. * Decimal point. This should probably use locale to find the correct
  806. * char to print out.
  807. */
  808. if (max > 0) {
  809. DOPR_OUTCH(buffer, *currlen, maxlen, '.');
  810.  
  811. while (zpadlen > 0) {
  812. DOPR_OUTCH(buffer, *currlen, maxlen, '0');
  813. --zpadlen;
  814. }
  815.  
  816. while (fplace > 0) {
  817. --fplace;
  818. DOPR_OUTCH(buffer, *currlen, maxlen, fconvert[fplace]);
  819. }
  820. }
  821.  
  822. while (padlen < 0) {
  823. DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
  824. ++padlen;
  825. }
  826. return 0;
  827. }
  828. #endif /* !defined(HAVE_SNPRINTF) || !defined(HAVE_VSNPRINTF) */
  829.  
  830. #if !defined(HAVE_VSNPRINTF)
  831. int
  832. vsnprintf (char *str, size_t count, const char *fmt, va_list args)
  833. {
  834. return dopr(str, count, fmt, args);
  835. }
  836. #endif
  837.  
  838. #if !defined(HAVE_SNPRINTF)
  839. int
  840. snprintf(char *str, size_t count, SNPRINTF_CONST char *fmt, ...)
  841. {
  842. size_t ret;
  843. va_list ap;
  844.  
  845. va_start(ap, fmt);
  846. ret = vsnprintf(str, count, fmt, ap);
  847. va_end(ap);
  848. return ret;
  849. }
  850. #endif
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