1 /*
2 * This is the vsnprintf for scummvm/symbian implementation from the original
3 * snprintf.c, all support functions has been removed and vsnprintf renamed to
4 * symbian_vsnprintf
5 * According to the homepage this function may be licensed under either the
6 * Frontier Artistic License or the GPL.
7 *
8 * snprintf.c - a portable implementation of snprintf
9 *
10 * AUTHOR
11 * Mark Martinec <mark.martinec@ijs.si>, April 1999.
12 *
13 * Copyright 1999, Mark Martinec. All rights reserved.
14 *
15 * TERMS AND CONDITIONS
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the "Frontier Artistic License" which comes
18 * with this Kit.
19 *
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty
22 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
23 * See the Frontier Artistic License for more details.
24 *
25 * You should have received a copy of the Frontier Artistic License
26 * with this Kit in the file named LICENSE.txt .
27 * If not, I'll be glad to provide one.
28 *
29 * FEATURES
30 * - careful adherence to specs regarding flags, field width and precision;
31 * - good performance for large string handling (large format, large
32 * argument or large paddings). Performance is similar to system's sprintf
33 * and in several cases significantly better (make sure you compile with
34 * optimizations turned on, tell the compiler the code is strict ANSI
35 * if necessary to give it more freedom for optimizations);
36 * - return value semantics per ISO/IEC 9899:1999 ("ISO C99");
37 * - written in standard ISO/ANSI C - requires an ANSI C compiler.
38 *
39 * SUPPORTED CONVERSION SPECIFIERS AND DATA TYPES
40 *
41 * This snprintf only supports the following conversion specifiers:
42 * s, c, d, u, o, x, X, p (and synonyms: i, D, U, O - see below)
43 * with flags: '-', '+', ' ', '0' and '#'.
44 * An asterisk is supported for field width as well as precision.
45 *
46 * Length modifiers 'h' (short int), 'l' (long int),
47 * and 'll' (long long int) are supported.
48 * NOTE:
49 * If macro SNPRINTF_LONGLONG_SUPPORT is not defined (default) the
50 * length modifier 'll' is recognized but treated the same as 'l',
51 * which may cause argument value truncation! Defining
52 * SNPRINTF_LONGLONG_SUPPORT requires that your system's sprintf also
53 * handles length modifier 'll'. long long int is a language extension
54 * which may not be portable.
55 *
56 * Conversion of numeric data (conversion specifiers d, u, o, x, X, p)
57 * with length modifiers (none or h, l, ll) is left to the system routine
58 * sprintf, but all handling of flags, field width and precision as well as
59 * c and s conversions is done very carefully by this portable routine.
60 * If a string precision (truncation) is specified (e.g. %.8s) it is
61 * guaranteed the string beyond the specified precision will not be referenced.
62 *
63 * Length modifiers h, l and ll are ignored for c and s conversions (data
64 * types wint_t and wchar_t are not supported).
65 *
66 * The following common synonyms for conversion characters are supported:
67 * - i is a synonym for d
68 * - D is a synonym for ld, explicit length modifiers are ignored
69 * - U is a synonym for lu, explicit length modifiers are ignored
70 * - O is a synonym for lo, explicit length modifiers are ignored
71 * The D, O and U conversion characters are nonstandard, they are supported
72 * for backward compatibility only, and should not be used for new code.
73 *
74 * The following is specifically NOT supported:
75 * - flag ' (thousands' grouping character) is recognized but ignored
76 * - numeric conversion specifiers: f, e, E, g, G and synonym F,
77 * as well as the new a and A conversion specifiers
78 * - length modifier 'L' (long double) and 'q' (quad - use 'll' instead)
79 * - wide character/string conversions: lc, ls, and nonstandard
80 * synonyms C and S
81 * - writeback of converted string length: conversion character n
82 * - the n$ specification for direct reference to n-th argument
83 * - locales
84 *
85 * It is permitted for str_m to be zero, and it is permitted to specify NULL
86 * pointer for resulting string argument if str_m is zero (as per ISO C99).
87 *
88 * The return value is the number of characters which would be generated
89 * for the given input, excluding the trailing null. If this value
90 * is greater or equal to str_m, not all characters from the result
91 * have been stored in str, output bytes beyond the (str_m-1) -th character
92 * are discarded. If str_m is greater than zero it is guaranteed
93 * the resulting string will be null-terminated.
94 *
95 * NOTE that this matches the ISO C99, OpenBSD, and GNU C library 2.1,
96 * but is different from some older and vendor implementations,
97 * and is also different from XPG, XSH5, SUSv2 specifications.
98 * For historical discussion on changes in the semantics and standards
99 * of snprintf see printf(3) man page in the Linux programmers manual.
100 *
101 * Routines asprintf and vasprintf return a pointer (in the ptr argument)
102 * to a buffer sufficiently large to hold the resulting string. This pointer
103 * should be passed to free(3) to release the allocated storage when it is
104 * no longer needed. If sufficient space cannot be allocated, these functions
105 * will return -1 and set ptr to be a NULL pointer. These two routines are a
106 * GNU C library extensions (glibc).
107 *
108 * Routines asnprintf and vasnprintf are similar to asprintf and vasprintf,
109 * yet, like snprintf and vsnprintf counterparts, will write at most str_m-1
110 * characters into the allocated output string, the last character in the
111 * allocated buffer then gets the terminating null. If the formatted string
112 * length (the return value) is greater than or equal to the str_m argument,
113 * the resulting string was truncated and some of the formatted characters
114 * were discarded. These routines present a handy way to limit the amount
115 * of allocated memory to some sane value.
116 *
117 * AVAILABILITY
118 * http://www.ijs.si/software/snprintf/
119 *
120 * REVISION HISTORY
121 * 1999-04 V0.9 Mark Martinec
122 * - initial version, some modifications after comparing printf
123 * man pages for Digital Unix 4.0, Solaris 2.6 and HPUX 10,
124 * and checking how Perl handles sprintf (differently!);
125 * 1999-04-09 V1.0 Mark Martinec <mark.martinec@ijs.si>
126 * - added main test program, fixed remaining inconsistencies,
127 * added optional (long long int) support;
128 * 1999-04-12 V1.1 Mark Martinec <mark.martinec@ijs.si>
129 * - support the 'p' conversion (pointer to void);
130 * - if a string precision is specified
131 * make sure the string beyond the specified precision
132 * will not be referenced (e.g. by strlen);
133 * 1999-04-13 V1.2 Mark Martinec <mark.martinec@ijs.si>
134 * - support synonyms %D=%ld, %U=%lu, %O=%lo;
135 * - speed up the case of long format string with few conversions;
136 * 1999-06-30 V1.3 Mark Martinec <mark.martinec@ijs.si>
137 * - fixed runaway loop (eventually crashing when str_l wraps
138 * beyond 2^31) while copying format string without
139 * conversion specifiers to a buffer that is too short
140 * (thanks to Edwin Young <edwiny@autonomy.com> for
141 * spotting the problem);
142 * - added macros PORTABLE_SNPRINTF_VERSION_(MAJOR|MINOR)
143 * to snprintf.h
144 * 2000-02-14 V2.0 (never released) Mark Martinec <mark.martinec@ijs.si>
145 * - relaxed license terms: The Artistic License now applies.
146 * You may still apply the GNU GENERAL PUBLIC LICENSE
147 * as was distributed with previous versions, if you prefer;
148 * - changed REVISION HISTORY dates to use ISO 8601 date format;
149 * - added vsnprintf (patch also independently proposed by
150 * Caolan McNamara 2000-05-04, and Keith M Willenson 2000-06-01)
151 * 2000-06-27 V2.1 Mark Martinec <mark.martinec@ijs.si>
152 * - removed POSIX check for str_m<1; value 0 for str_m is
153 * allowed by ISO C99 (and GNU C library 2.1) - (pointed out
154 * on 2000-05-04 by Caolan McNamara, caolan@ csn dot ul dot ie).
155 * Besides relaxed license this change in standards adherence
156 * is the main reason to bump up the major version number;
157 * - added nonstandard routines asnprintf, vasnprintf, asprintf,
158 * vasprintf that dynamically allocate storage for the
159 * resulting string; these routines are not compiled by default,
160 * see comments where NEED_V?ASN?PRINTF macros are defined;
161 * - autoconf contributed by Caolan McNamara
162 * 2000-10-06 V2.2 Mark Martinec <mark.martinec@ijs.si>
163 * - BUG FIX: the %c conversion used a temporary variable
164 * that was no longer in scope when referenced,
165 * possibly causing incorrect resulting character;
166 * - BUG FIX: make precision and minimal field width unsigned
167 * to handle huge values (2^31 <= n < 2^32) correctly;
168 * also be more careful in the use of signed/unsigned/size_t
169 * internal variables - probably more careful than many
170 * vendor implementations, but there may still be a case
171 * where huge values of str_m, precision or minimal field
172 * could cause incorrect behaviour;
173 * - use separate variables for signed/unsigned arguments,
174 * and for short/int, long, and long long argument lengths
175 * to avoid possible incompatibilities on certain
176 * computer architectures. Also use separate variable
177 * arg_sign to hold sign of a numeric argument,
178 * to make code more transparent;
179 * - some fiddling with zero padding and "0x" to make it
180 * Linux compatible;
181 * - systematically use macros fast_memcpy and fast_memset
182 * instead of case-by-case hand optimization; determine some
183 * breakeven string lengths for different architectures;
184 * - terminology change: 'format' -> 'conversion specifier',
185 * 'C9x' -> 'ISO/IEC 9899:1999 ("ISO C99")',
186 * 'alternative form' -> 'alternate form',
187 * 'data type modifier' -> 'length modifier';
188 * - several comments rephrased and new ones added;
189 * - make compiler not complain about 'credits' defined but
190 * not used;
191 */
192 /* ============================================= */
193 /* NO USER SERVICABLE PARTS FOLLOWING THIS POINT */
194 /* ============================================= */
195
196 #define PORTABLE_SNPRINTF_VERSION_MAJOR 2
197 #define PORTABLE_SNPRINTF_VERSION_MINOR 2
198 #include <sys/types.h>
199 #include <string.h>
200 #include <stdlib.h>
201 #include <stdio.h>
202 #include <stdarg.h>
203 #include <assert.h>
204 #include <errno.h>
205 #ifdef isdigit
206 #undef isdigit
207 #endif
208 #define isdigit(c) ((c) >= '0' && (c) <= '9')
209
210 #ifndef breakeven_point
211 # define breakeven_point 6 /* some reasonable one-size-fits-all value */
212 #endif
213
214 #define fast_memcpy(d,s,n) \
215 { size_t nn = (size_t)(n); \
216 if (nn >= breakeven_point) memcpy((d), (s), nn); \
217 else if (nn > 0) { /* proc call overhead is worth only for large strings*/\
218 char *dd; const char *ss; \
219 for (ss=(s), dd=(d); nn>0; nn--) *dd++ = *ss++; } }
220
221 #define fast_memset(d,c,n) \
222 { size_t nn = (size_t)(n); \
223 if (nn >= breakeven_point) memset((d), (int)(c), nn); \
224 else if (nn > 0) { /* proc call overhead is worth only for large strings*/\
225 char *dd; const int cc=(int)(c); \
226 for (dd=(d); nn>0; nn--) *dd++ = cc; } }
227
228
229 /* declarations */
230
231 static char credits[] = "\n\
232 @(#)snprintf.c, v2.2: Mark Martinec, <mark.martinec@ijs.si>\n\
233 @(#)snprintf.c, v2.2: Copyright 1999, Mark Martinec. Frontier Artistic License applies.\n\
234 @(#)snprintf.c, v2.2: http://www.ijs.si/software/snprintf/\n";
symbian_vsnprintf(char * str,size_t str_m,const char * fmt,va_list ap)235 int symbian_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap) {
236
237 size_t str_l = 0;
238 const char *p = fmt;
239
240 /* In contrast with POSIX, the ISO C99 now says
241 * that str can be NULL and str_m can be 0.
242 * This is more useful than the old: if (str_m < 1) return -1; */
243
244 if (!p) p = "";
245 while (*p) {
246 if (*p != '%') {
247 /* if (str_l < str_m) str[str_l++] = *p++; -- this would be sufficient */
248 /* but the following code achieves better performance for cases
249 * where format string is long and contains few conversions */
250 const char *q = strchr(p + 1, '%');
251 size_t n = !q ? strlen(p) : (q - p);
252 if (str_l < str_m) {
253 size_t avail = str_m - str_l;
254 fast_memcpy(str + str_l, p, (n > avail ? avail : n));
255 }
256 p += n;
257 str_l += n;
258 } else {
259 const char *starting_p;
260 size_t min_field_width = 0, precision = 0;
261 int zero_padding = 0, precision_specified = 0, justify_left = 0;
262 int alternate_form = 0, force_sign = 0;
263 int space_for_positive = 1; /* If both the ' ' and '+' flags appear,
264 the ' ' flag should be ignored. */
265 char length_modifier = '\0'; /* allowed values: \0, h, l, L */
266 char tmp[32];/* temporary buffer for simple numeric->string conversion */
267
268 const char *str_arg; /* string address in case of string argument */
269 size_t str_arg_l; /* natural field width of arg without padding
270 and sign */
271 unsigned char uchar_arg;
272 /* unsigned char argument value - only defined for c conversion.
273 N.B. standard explicitly states the char argument for
274 the c conversion is unsigned */
275
276 size_t number_of_zeros_to_pad = 0;
277 /* number of zeros to be inserted for numeric conversions
278 as required by the precision or minimal field width */
279
280 size_t zero_padding_insertion_ind = 0;
281 /* index into tmp where zero padding is to be inserted */
282
283 char fmt_spec = '\0';
284 /* current conversion specifier character */
285
286 str_arg = credits;/* just to make compiler happy (defined but not used)*/
287 str_arg = NULL;
288 starting_p = p;
289 p++; /* skip '%' */
290 /* parse flags */
291 while (*p == '0' || *p == '-' || *p == '+' ||
292 *p == ' ' || *p == '#' || *p == '\'') {
293 switch (*p) {
294 case '0':
295 zero_padding = 1;
296 break;
297 case '-':
298 justify_left = 1;
299 break;
300 case '+':
301 force_sign = 1;
302 space_for_positive = 0;
303 break;
304 case ' ':
305 force_sign = 1;
306 /* If both the ' ' and '+' flags appear, the ' ' flag should be ignored */
307 break;
308 case '#':
309 alternate_form = 1;
310 break;
311 case '\'':
312 break;
313 }
314 p++;
315 }
316 /* If the '0' and '-' flags both appear, the '0' flag should be ignored. */
317
318 /* parse field width */
319 if (*p == '*') {
320 int j;
321 p++;
322 j = va_arg(ap, int);
323 if (j >= 0) min_field_width = j;
324 else { min_field_width = -j; justify_left = 1; }
325 } else if (isdigit((int)(*p))) {
326 /* size_t could be wider than unsigned int;
327 make sure we treat argument like common implementations do */
328 unsigned int uj = *p++ - '0';
329 while (isdigit((int)(*p))) uj = 10 * uj + (unsigned int)(*p++ - '0');
330 min_field_width = uj;
331 }
332 /* parse precision */
333 if (*p == '.') {
334 p++;
335 precision_specified = 1;
336 if (*p == '*') {
337 int j = va_arg(ap, int);
338 p++;
339 if (j >= 0) precision = j;
340 else {
341 precision_specified = 0;
342 precision = 0;
343 /* NOTE:
344 * Solaris 2.6 man page claims that in this case the precision
345 * should be set to 0. Digital Unix 4.0, HPUX 10 and BSD man page
346 * claim that this case should be treated as unspecified precision,
347 * which is what we do here.
348 */
349 }
350 } else if (isdigit((int)(*p))) {
351 /* size_t could be wider than unsigned int;
352 make sure we treat argument like common implementations do */
353 unsigned int uj = *p++ - '0';
354 while (isdigit((int)(*p))) uj = 10 * uj + (unsigned int)(*p++ - '0');
355 precision = uj;
356 }
357 }
358 /* parse 'h', 'l' and 'll' length modifiers */
359 if (*p == 'h' || *p == 'l') {
360 length_modifier = *p;
361 p++;
362 if (length_modifier == 'l' && *p == 'l') { /* double l = long long */
363 #ifdef SNPRINTF_LONGLONG_SUPPORT
364 length_modifier = '2'; /* double l encoded as '2' */
365 #else
366 length_modifier = 'l'; /* treat it as a single 'l' */
367 #endif
368 p++;
369 }
370 }
371 fmt_spec = *p;
372 /* common synonyms: */
373 switch (fmt_spec) {
374 case 'i':
375 fmt_spec = 'd';
376 break;
377 case 'D':
378 fmt_spec = 'd';
379 length_modifier = 'l';
380 break;
381 case 'U':
382 fmt_spec = 'u';
383 length_modifier = 'l';
384 break;
385 case 'O':
386 fmt_spec = 'o';
387 length_modifier = 'l';
388 break;
389 default:
390 break;
391 }
392 /* get parameter value, do initial processing */
393 switch (fmt_spec) {
394 case '%': /* % behaves similar to 's' regarding flags and field widths */
395 case 'c': /* c behaves similar to 's' regarding flags and field widths */
396 case 's':
397 length_modifier = '\0'; /* wint_t and wchar_t not supported */
398 /* the result of zero padding flag with non-numeric conversion specifier*/
399 /* is undefined. Solaris and HPUX 10 does zero padding in this case, */
400 /* Digital Unix and Linux does not. */
401 zero_padding = 0; /* turn zero padding off for string conversions */
402 str_arg_l = 1;
403 switch (fmt_spec) {
404 case '%':
405 str_arg = p;
406 break;
407 case 'c': {
408 int j = va_arg(ap, int);
409 uchar_arg = (unsigned char) j; /* standard demands unsigned char */
410 str_arg = (const char *) & uchar_arg;
411 break;
412 }
413 case 's':
414 str_arg = va_arg(ap, const char *);
415 if (!str_arg) str_arg_l = 0;
416 /* make sure not to address string beyond the specified precision !!! */
417 else if (!precision_specified) str_arg_l = strlen(str_arg);
418 /* truncate string if necessary as requested by precision */
419 else if (precision == 0) str_arg_l = 0;
420 else {
421 /* memchr on HP does not like n > 2^31 !!! */
422 const char *q = (const char*) memchr(str_arg, '\0',
423 precision <= 0x7fffffff ? precision : 0x7fffffff);
424 str_arg_l = !q ? precision : (q - str_arg);
425 }
426 break;
427 default:
428 break;
429 }
430 break;
431 case 'd':
432 case 'u':
433 case 'o':
434 case 'x':
435 case 'X':
436 case 'p': {
437 /* NOTE: the u, o, x, X and p conversion specifiers imply
438 the value is unsigned; d implies a signed value */
439
440 int arg_sign = 0;
441 /* 0 if numeric argument is zero (or if pointer is NULL for 'p'),
442 +1 if greater than zero (or nonzero for unsigned arguments),
443 -1 if negative (unsigned argument is never negative) */
444
445 int int_arg = 0;
446 unsigned int uint_arg = 0;
447 /* only defined for length modifier h, or for no length modifiers */
448
449 long int long_arg = 0;
450 unsigned long int ulong_arg = 0;
451 /* only defined for length modifier l */
452
453 void *ptr_arg = NULL;
454 /* pointer argument value -only defined for p conversion */
455
456 #ifdef SNPRINTF_LONGLONG_SUPPORT
457 long long int long_long_arg = 0;
458 unsigned long long int ulong_long_arg = 0;
459 /* only defined for length modifier ll */
460 #endif
461 if (fmt_spec == 'p') {
462 /* HPUX 10: An l, h, ll or L before any other conversion character
463 * (other than d, i, u, o, x, or X) is ignored.
464 * Digital Unix:
465 * not specified, but seems to behave as HPUX does.
466 * Solaris: If an h, l, or L appears before any other conversion
467 * specifier (other than d, i, u, o, x, or X), the behavior
468 * is undefined. (Actually %hp converts only 16-bits of address
469 * and %llp treats address as 64-bit data which is incompatible
470 * with (void *) argument on a 32-bit system).
471 */
472 length_modifier = '\0';
473 ptr_arg = va_arg(ap, void *);
474 if (ptr_arg != NULL) arg_sign = 1;
475 } else if (fmt_spec == 'd') { /* signed */
476 switch (length_modifier) {
477 case '\0':
478 case 'h':
479 /* It is non-portable to specify a second argument of char or short
480 * to va_arg, because arguments seen by the called function
481 * are not char or short. C converts char and short arguments
482 * to int before passing them to a function.
483 */
484 int_arg = va_arg(ap, int);
485 if (int_arg > 0) arg_sign = 1;
486 else if (int_arg < 0) arg_sign = -1;
487 break;
488 case 'l':
489 long_arg = va_arg(ap, long int);
490 if (long_arg > 0) arg_sign = 1;
491 else if (long_arg < 0) arg_sign = -1;
492 break;
493 #ifdef SNPRINTF_LONGLONG_SUPPORT
494 case '2':
495 long_long_arg = va_arg(ap, long long int);
496 if (long_long_arg > 0) arg_sign = 1;
497 else if (long_long_arg < 0) arg_sign = -1;
498 break;
499 #endif
500 }
501 } else { /* unsigned */
502 switch (length_modifier) {
503 case '\0':
504 case 'h':
505 uint_arg = va_arg(ap, unsigned int);
506 if (uint_arg) arg_sign = 1;
507 break;
508 case 'l':
509 ulong_arg = va_arg(ap, unsigned long int);
510 if (ulong_arg) arg_sign = 1;
511 break;
512 #ifdef SNPRINTF_LONGLONG_SUPPORT
513 case '2':
514 ulong_long_arg = va_arg(ap, unsigned long long int);
515 if (ulong_long_arg) arg_sign = 1;
516 break;
517 #endif
518 }
519 }
520 str_arg = tmp;
521 str_arg_l = 0;
522 /* NOTE:
523 * For d, i, u, o, x, and X conversions, if precision is specified,
524 * the '0' flag should be ignored. This is so with Solaris 2.6,
525 * Digital UNIX 4.0, HPUX 10, Linux, FreeBSD, NetBSD; but not with Perl.
526 */
527 if (precision_specified) zero_padding = 0;
528 if (fmt_spec == 'd') {
529 if (force_sign && arg_sign >= 0)
530 tmp[str_arg_l++] = space_for_positive ? ' ' : '+';
531 /* leave negative numbers for sprintf to handle,
532 to avoid handling tricky cases like (short int)(-32768) */
533 } else if (alternate_form) {
534 if (arg_sign != 0 && (fmt_spec == 'x' || fmt_spec == 'X'))
535 { tmp[str_arg_l++] = '0'; tmp[str_arg_l++] = fmt_spec; }
536 /* alternate form should have no effect for p conversion, but ... */
537 }
538 zero_padding_insertion_ind = str_arg_l;
539 if (!precision_specified) precision = 1; /* default precision is 1 */
540 if (precision == 0 && arg_sign == 0
541 ) {
542 /* converted to null string */
543 /* When zero value is formatted with an explicit precision 0,
544 the resulting formatted string is empty (d, i, u, o, x, X, p). */
545 } else {
546 char f[5];
547 int f_l = 0;
548 f[f_l++] = '%'; /* construct a simple format string for sprintf */
549 if (!length_modifier) { } else if (length_modifier == '2') { f[f_l++] = 'l'; f[f_l++] = 'l'; } else f[f_l++] = length_modifier;
550 f[f_l++] = fmt_spec;
551 f[f_l++] = '\0';
552 if (fmt_spec == 'p') str_arg_l += sprintf(tmp + str_arg_l, f, ptr_arg);
553 else if (fmt_spec == 'd') { /* signed */
554 switch (length_modifier) {
555 case '\0':
556 case 'h':
557 str_arg_l += sprintf(tmp + str_arg_l, f, int_arg);
558 break;
559 case 'l':
560 str_arg_l += sprintf(tmp + str_arg_l, f, long_arg);
561 break;
562 #ifdef SNPRINTF_LONGLONG_SUPPORT
563 case '2':
564 str_arg_l += sprintf(tmp + str_arg_l, f, long_long_arg);
565 break;
566 #endif
567 }
568 } else { /* unsigned */
569 switch (length_modifier) {
570 case '\0':
571 case 'h':
572 str_arg_l += sprintf(tmp + str_arg_l, f, uint_arg);
573 break;
574 case 'l':
575 str_arg_l += sprintf(tmp + str_arg_l, f, ulong_arg);
576 break;
577 #ifdef SNPRINTF_LONGLONG_SUPPORT
578 case '2':
579 str_arg_l += sprintf(tmp + str_arg_l, f, ulong_long_arg);
580 break;
581 #endif
582 }
583 }
584 /* include the optional minus sign and possible "0x"
585 in the region before the zero padding insertion point */
586 if (zero_padding_insertion_ind < str_arg_l &&
587 tmp[zero_padding_insertion_ind] == '-') {
588 zero_padding_insertion_ind++;
589 }
590 if (zero_padding_insertion_ind + 1 < str_arg_l &&
591 tmp[zero_padding_insertion_ind] == '0' &&
592 (tmp[zero_padding_insertion_ind+1] == 'x' ||
593 tmp[zero_padding_insertion_ind+1] == 'X')) {
594 zero_padding_insertion_ind += 2;
595 }
596 }
597 {
598 size_t num_of_digits = str_arg_l - zero_padding_insertion_ind;
599 if (alternate_form && fmt_spec == 'o'
600 /* unless zero is already the first character */
601 && !(zero_padding_insertion_ind < str_arg_l
602 && tmp[zero_padding_insertion_ind] == '0')
603 ) { /* assure leading zero for alternate-form octal numbers */
604 if (!precision_specified || precision < num_of_digits + 1) {
605 /* precision is increased to force the first character to be zero,
606 except if a zero value is formatted with an explicit precision
607 of zero */
608 precision = num_of_digits + 1;
609 precision_specified = 1;
610 }
611 }
612 /* zero padding to specified precision? */
613 if (num_of_digits < precision)
614 number_of_zeros_to_pad = precision - num_of_digits;
615 }
616 /* zero padding to specified minimal field width? */
617 if (!justify_left && zero_padding) {
618 int n = min_field_width - (str_arg_l + number_of_zeros_to_pad);
619 if (n > 0) number_of_zeros_to_pad += n;
620 }
621 break;
622 }
623 default: /* unrecognized conversion specifier, keep format string as-is*/
624 zero_padding = 0; /* turn zero padding off for non-numeric convers. */
625 justify_left = 1;
626 min_field_width = 0; /* reset flags */
627 /* discard the unrecognized conversion, just keep *
628 * the unrecognized conversion character */
629 str_arg = p;
630 str_arg_l = 0;
631 if (*p) str_arg_l++; /* include invalid conversion specifier unchanged
632 if not at end-of-string */
633 break;
634 }
635 if (*p) p++; /* step over the just processed conversion specifier */
636 /* insert padding to the left as requested by min_field_width;
637 this does not include the zero padding in case of numerical conversions*/
638 if (!justify_left) { /* left padding with blank or zero */
639 int n = min_field_width - (str_arg_l + number_of_zeros_to_pad);
640 if (n > 0) {
641 if (str_l < str_m) {
642 size_t avail = str_m - str_l;
643 fast_memset(str + str_l, (zero_padding ? '0' : ' '), (n > avail ? avail : n));
644 }
645 str_l += n;
646 }
647 }
648 /* zero padding as requested by the precision or by the minimal field width
649 * for numeric conversions required? */
650 if (number_of_zeros_to_pad <= 0) {
651 /* will not copy first part of numeric right now, *
652 * force it to be copied later in its entirety */
653 zero_padding_insertion_ind = 0;
654 } else {
655 /* insert first part of numerics (sign or '0x') before zero padding */
656 int n = zero_padding_insertion_ind;
657 if (n > 0) {
658 if (str_l < str_m) {
659 size_t avail = str_m - str_l;
660 fast_memcpy(str + str_l, str_arg, (n > avail ? avail : n));
661 }
662 str_l += n;
663 }
664 /* insert zero padding as requested by the precision or min field width */
665 n = number_of_zeros_to_pad;
666 if (n > 0) {
667 if (str_l < str_m) {
668 size_t avail = str_m - str_l;
669 fast_memset(str + str_l, '0', (n > avail ? avail : n));
670 }
671 str_l += n;
672 }
673 }
674 /* insert formatted string
675 * (or as-is conversion specifier for unknown conversions) */
676 {
677 int n = str_arg_l - zero_padding_insertion_ind;
678 if (n > 0) {
679 if (str_l < str_m) {
680 size_t avail = str_m - str_l;
681 fast_memcpy(str + str_l, str_arg + zero_padding_insertion_ind,
682 (n > avail ? avail : n));
683 }
684 str_l += n;
685 }
686 }
687 /* insert right padding */
688 if (justify_left) { /* right blank padding to the field width */
689 int n = min_field_width - (str_arg_l + number_of_zeros_to_pad);
690 if (n > 0) {
691 if (str_l < str_m) {
692 size_t avail = str_m - str_l;
693 fast_memset(str + str_l, ' ', (n > avail ? avail : n));
694 }
695 str_l += n;
696 }
697 }
698 }
699 }
700 if (str_m > 0) { /* make sure the string is null-terminated
701 even at the expense of overwriting the last character
702 (shouldn't happen, but just in case) */
703 str[str_l <= str_m-1 ? str_l : str_m-1] = '\0';
704 }
705 /* Return the number of characters formatted (excluding trailing null
706 * character), that is, the number of characters that would have been
707 * written to the buffer if it were large enough.
708 *
709 * The value of str_l should be returned, but str_l is of unsigned type
710 * size_t, and snprintf is int, possibly leading to an undetected
711 * integer overflow, resulting in a negative return value, which is illegal.
712 * Both XSH5 and ISO C99 (at least the draft) are silent on this issue.
713 * Should errno be set to EOVERFLOW and EOF returned in this case???
714 */
715 return (int) str_l;
716 }
717
symbian_snprintf(char * text,size_t maxlen,const char * fmt,...)718 int symbian_snprintf(char *text, size_t maxlen, const char *fmt, ...) {
719 va_list ap;
720 int retval;
721
722 va_start(ap, fmt);
723 retval = symbian_vsnprintf(text, maxlen, fmt, ap);
724 va_end(ap);
725
726 return retval;
727 }
728