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1.1 root 1: /*
2: * snprintf.c - a portable implementation of snprintf
3: *
4: * AUTHOR
5: * Mark Martinec <[email protected]>, April 1999.
6: *
7: * Copyright 1999, Mark Martinec. All rights reserved.
8: *
9: * TERMS AND CONDITIONS
10: * This program is free software; you can redistribute it and/or modify
11: * it under the terms of the "Frontier Artistic License" which comes
12: * with this Kit.
13: *
14: * This program is distributed in the hope that it will be useful,
15: * but WITHOUT ANY WARRANTY; without even the implied warranty
16: * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
17: * See the Frontier Artistic License for more details.
18: *
19: * You should have received a copy of the Frontier Artistic License
20: * with this Kit in the file named LICENSE.txt .
21: * If not, I'll be glad to provide one.
22: *
23: * FEATURES
24: * - careful adherence to specs regarding flags, field width and precision;
25: * - good performance for large string handling (large format, large
26: * argument or large paddings). Performance is similar to system's sprintf
27: * and in several cases significantly better (make sure you compile with
28: * optimizations turned on, tell the compiler the code is strict ANSI
29: * if necessary to give it more freedom for optimizations);
30: * - return value semantics per ISO/IEC 9899:1999 ("ISO C99");
31: * - written in standard ISO/ANSI C - requires an ANSI C compiler.
32: *
33: * SUPPORTED CONVERSION SPECIFIERS AND DATA TYPES
34: *
35: * This snprintf only supports the following conversion specifiers:
36: * s, c, d, u, o, x, X, p (and synonyms: i, D, U, O - see below)
37: * with flags: '-', '+', ' ', '0' and '#'.
38: * An asterisk is supported for field width as well as precision.
39: *
40: * Length modifiers 'h' (short int), 'l' (long int),
41: * and 'll' (long long int) are supported.
42: * NOTE:
43: * If macro SNPRINTF_LONGLONG_SUPPORT is not defined (default) the
44: * length modifier 'll' is recognized but treated the same as 'l',
45: * which may cause argument value truncation! Defining
46: * SNPRINTF_LONGLONG_SUPPORT requires that your system's sprintf also
47: * handles length modifier 'll'. long long int is a language extension
48: * which may not be portable.
49: *
50: * Conversion of numeric data (conversion specifiers d, u, o, x, X, p)
51: * with length modifiers (none or h, l, ll) is left to the system routine
52: * sprintf, but all handling of flags, field width and precision as well as
53: * c and s conversions is done very carefully by this portable routine.
54: * If a string precision (truncation) is specified (e.g. %.8s) it is
55: * guaranteed the string beyond the specified precision will not be referenced.
56: *
57: * Length modifiers h, l and ll are ignored for c and s conversions (data
58: * types wint_t and wchar_t are not supported).
59: *
60: * The following common synonyms for conversion characters are supported:
61: * - i is a synonym for d
62: * - D is a synonym for ld, explicit length modifiers are ignored
63: * - U is a synonym for lu, explicit length modifiers are ignored
64: * - O is a synonym for lo, explicit length modifiers are ignored
65: * The D, O and U conversion characters are nonstandard, they are supported
66: * for backward compatibility only, and should not be used for new code.
67: *
68: * The following is specifically NOT supported:
69: * - flag ' (thousands' grouping character) is recognized but ignored
70: * - numeric conversion specifiers: f, e, E, g, G and synonym F,
71: * as well as the new a and A conversion specifiers
72: * - length modifier 'L' (long double) and 'q' (quad - use 'll' instead)
73: * - wide character/string conversions: lc, ls, and nonstandard
74: * synonyms C and S
75: * - writeback of converted string length: conversion character n
76: * - the n$ specification for direct reference to n-th argument
77: * - locales
78: *
79: * It is permitted for str_m to be zero, and it is permitted to specify NULL
80: * pointer for resulting string argument if str_m is zero (as per ISO C99).
81: *
82: * The return value is the number of characters which would be generated
83: * for the given input, excluding the trailing null. If this value
84: * is greater or equal to str_m, not all characters from the result
85: * have been stored in str, output bytes beyond the (str_m-1) -th character
86: * are discarded. If str_m is greater than zero it is guaranteed
87: * the resulting string will be null-terminated.
88: *
89: * NOTE that this matches the ISO C99, OpenBSD, and GNU C library 2.1,
90: * but is different from some older and vendor implementations,
91: * and is also different from XPG, XSH5, SUSv2 specifications.
92: * For historical discussion on changes in the semantics and standards
93: * of snprintf see printf(3) man page in the Linux programmers manual.
94: *
95: * Routines asprintf and vasprintf return a pointer (in the ptr argument)
96: * to a buffer sufficiently large to hold the resulting string. This pointer
97: * should be passed to free(3) to release the allocated storage when it is
98: * no longer needed. If sufficient space cannot be allocated, these functions
99: * will return -1 and set ptr to be a NULL pointer. These two routines are a
100: * GNU C library extensions (glibc).
101: *
102: * Routines asnprintf and vasnprintf are similar to asprintf and vasprintf,
103: * yet, like snprintf and vsnprintf counterparts, will write at most str_m-1
104: * characters into the allocated output string, the last character in the
105: * allocated buffer then gets the terminating null. If the formatted string
106: * length (the return value) is greater than or equal to the str_m argument,
107: * the resulting string was truncated and some of the formatted characters
108: * were discarded. These routines present a handy way to limit the amount
109: * of allocated memory to some sane value.
110: *
111: * AVAILABILITY
112: * http://www.ijs.si/software/snprintf/
113: *
114: * REVISION HISTORY
115: * 1999-04 V0.9 Mark Martinec
116: * - initial version, some modifications after comparing printf
117: * man pages for Digital Unix 4.0, Solaris 2.6 and HPUX 10,
118: * and checking how Perl handles sprintf (differently!);
119: * 1999-04-09 V1.0 Mark Martinec <[email protected]>
120: * - added main test program, fixed remaining inconsistencies,
121: * added optional (long long int) support;
122: * 1999-04-12 V1.1 Mark Martinec <[email protected]>
123: * - support the 'p' conversion (pointer to void);
124: * - if a string precision is specified
125: * make sure the string beyond the specified precision
126: * will not be referenced (e.g. by strlen);
127: * 1999-04-13 V1.2 Mark Martinec <[email protected]>
128: * - support synonyms %D=%ld, %U=%lu, %O=%lo;
129: * - speed up the case of long format string with few conversions;
130: * 1999-06-30 V1.3 Mark Martinec <[email protected]>
131: * - fixed runaway loop (eventually crashing when str_l wraps
132: * beyond 2^31) while copying format string without
133: * conversion specifiers to a buffer that is too short
134: * (thanks to Edwin Young <[email protected]> for
135: * spotting the problem);
136: * - added macros PORTABLE_SNPRINTF_VERSION_(MAJOR|MINOR)
137: * to snprintf.h
138: * 2000-02-14 V2.0 (never released) Mark Martinec <[email protected]>
139: * - relaxed license terms: The Artistic License now applies.
140: * You may still apply the GNU GENERAL PUBLIC LICENSE
141: * as was distributed with previous versions, if you prefer;
142: * - changed REVISION HISTORY dates to use ISO 8601 date format;
143: * - added vsnprintf (patch also independently proposed by
144: * Caolan McNamara 2000-05-04, and Keith M Willenson 2000-06-01)
145: * 2000-06-27 V2.1 Mark Martinec <[email protected]>
146: * - removed POSIX check for str_m<1; value 0 for str_m is
147: * allowed by ISO C99 (and GNU C library 2.1) - (pointed out
148: * on 2000-05-04 by Caolan McNamara, caolan@ csn dot ul dot ie).
149: * Besides relaxed license this change in standards adherence
150: * is the main reason to bump up the major version number;
151: * - added nonstandard routines asnprintf, vasnprintf, asprintf,
152: * vasprintf that dynamically allocate storage for the
153: * resulting string; these routines are not compiled by default,
154: * see comments where NEED_V?ASN?PRINTF macros are defined;
155: * - autoconf contributed by Caolan McNamara
156: * 2000-10-06 V2.2 Mark Martinec <[email protected]>
157: * - BUG FIX: the %c conversion used a temporary variable
158: * that was no longer in scope when referenced,
159: * possibly causing incorrect resulting character;
160: * - BUG FIX: make precision and minimal field width unsigned
161: * to handle huge values (2^31 <= n < 2^32) correctly;
162: * also be more careful in the use of signed/unsigned/size_t
163: * internal variables - probably more careful than many
164: * vendor implementations, but there may still be a case
165: * where huge values of str_m, precision or minimal field
166: * could cause incorrect behaviour;
167: * - use separate variables for signed/unsigned arguments,
168: * and for short/int, long, and long long argument lengths
169: * to avoid possible incompatibilities on certain
170: * computer architectures. Also use separate variable
171: * arg_sign to hold sign of a numeric argument,
172: * to make code more transparent;
173: * - some fiddling with zero padding and "0x" to make it
174: * Linux compatible;
175: * - systematically use macros fast_memcpy and fast_memset
176: * instead of case-by-case hand optimization; determine some
177: * breakeven string lengths for different architectures;
178: * - terminology change: 'format' -> 'conversion specifier',
179: * 'C9x' -> 'ISO/IEC 9899:1999 ("ISO C99")',
180: * 'alternative form' -> 'alternate form',
181: * 'data type modifier' -> 'length modifier';
182: * - several comments rephrased and new ones added;
183: * - make compiler not complain about 'credits' defined but
184: * not used;
185: */
186:
187:
188: /* Define HAVE_SNPRINTF if your system already has snprintf and vsnprintf.
189: *
190: * If HAVE_SNPRINTF is defined this module will not produce code for
191: * snprintf and vsnprintf, unless PREFER_PORTABLE_SNPRINTF is defined as well,
192: * causing this portable version of snprintf to be called portable_snprintf
193: * (and portable_vsnprintf).
194: */
195: /* #define HAVE_SNPRINTF */
196:
197: /* Define PREFER_PORTABLE_SNPRINTF if your system does have snprintf and
198: * vsnprintf but you would prefer to use the portable routine(s) instead.
199: * In this case the portable routine is declared as portable_snprintf
200: * (and portable_vsnprintf) and a macro 'snprintf' (and 'vsnprintf')
201: * is defined to expand to 'portable_v?snprintf' - see file snprintf.h .
202: * Defining this macro is only useful if HAVE_SNPRINTF is also defined,
203: * but does does no harm if defined nevertheless.
204: */
205: /* #define PREFER_PORTABLE_SNPRINTF */
206:
207: /* Define SNPRINTF_LONGLONG_SUPPORT if you want to support
208: * data type (long long int) and length modifier 'll' (e.g. %lld).
209: * If undefined, 'll' is recognized but treated as a single 'l'.
210: *
211: * If the system's sprintf does not handle 'll'
212: * the SNPRINTF_LONGLONG_SUPPORT must not be defined!
213: *
214: * This is off by default as (long long int) is a language extension.
215: */
216: /* #define SNPRINTF_LONGLONG_SUPPORT */
217:
218: /* Define NEED_SNPRINTF_ONLY if you only need snprintf, and not vsnprintf.
219: * If NEED_SNPRINTF_ONLY is defined, the snprintf will be defined directly,
220: * otherwise both snprintf and vsnprintf routines will be defined
221: * and snprintf will be a simple wrapper around vsnprintf, at the expense
222: * of an extra procedure call.
223: */
224: /* #define NEED_SNPRINTF_ONLY */
225:
226: /* Define NEED_V?ASN?PRINTF macros if you need library extension
227: * routines asprintf, vasprintf, asnprintf, vasnprintf respectively,
228: * and your system library does not provide them. They are all small
229: * wrapper routines around portable_vsnprintf. Defining any of the four
230: * NEED_V?ASN?PRINTF macros automatically turns off NEED_SNPRINTF_ONLY
231: * and turns on PREFER_PORTABLE_SNPRINTF.
232: *
233: * Watch for name conflicts with the system library if these routines
234: * are already present there.
235: *
236: * NOTE: vasprintf and vasnprintf routines need va_copy() from stdarg.h, as
237: * specified by C99, to be able to traverse the same list of arguments twice.
238: * I don't know of any other standard and portable way of achieving the same.
239: * With some versions of gcc you may use __va_copy(). You might even get away
240: * with "ap2 = ap", in this case you must not call va_end(ap2) !
241: * #define va_copy(ap2,ap) ap2 = ap
242: */
243: /* #define NEED_ASPRINTF */
244: /* #define NEED_ASNPRINTF */
245: /* #define NEED_VASPRINTF */
246: /* #define NEED_VASNPRINTF */
247:
248:
249: /* Define the following macros if desired:
250: * SOLARIS_COMPATIBLE, SOLARIS_BUG_COMPATIBLE,
251: * HPUX_COMPATIBLE, HPUX_BUG_COMPATIBLE, LINUX_COMPATIBLE,
252: * DIGITAL_UNIX_COMPATIBLE, DIGITAL_UNIX_BUG_COMPATIBLE,
253: * PERL_COMPATIBLE, PERL_BUG_COMPATIBLE,
254: *
255: * - For portable applications it is best not to rely on peculiarities
256: * of a given implementation so it may be best not to define any
257: * of the macros that select compatibility and to avoid features
258: * that vary among the systems.
259: *
260: * - Selecting compatibility with more than one operating system
261: * is not strictly forbidden but is not recommended.
262: *
263: * - 'x'_BUG_COMPATIBLE implies 'x'_COMPATIBLE .
264: *
265: * - 'x'_COMPATIBLE refers to (and enables) a behaviour that is
266: * documented in a sprintf man page on a given operating system
267: * and actually adhered to by the system's sprintf (but not on
268: * most other operating systems). It may also refer to and enable
269: * a behaviour that is declared 'undefined' or 'implementation specific'
270: * in the man page but a given implementation behaves predictably
271: * in a certain way.
272: *
273: * - 'x'_BUG_COMPATIBLE refers to (and enables) a behaviour of system's sprintf
274: * that contradicts the sprintf man page on the same operating system.
275: *
276: * - I do not claim that the 'x'_COMPATIBLE and 'x'_BUG_COMPATIBLE
277: * conditionals take into account all idiosyncrasies of a particular
278: * implementation, there may be other incompatibilities.
279: */
1.1.1.2 ! root 280:
1.1 root 281:
282:
283: /* ============================================= */
284: /* NO USER SERVICABLE PARTS FOLLOWING THIS POINT */
285: /* ============================================= */
286:
287: #define PORTABLE_SNPRINTF_VERSION_MAJOR 2
288: #define PORTABLE_SNPRINTF_VERSION_MINOR 2
289:
290: #if defined(NEED_ASPRINTF) || defined(NEED_ASNPRINTF) || defined(NEED_VASPRINTF) || defined(NEED_VASNPRINTF)
291: # if defined(NEED_SNPRINTF_ONLY)
292: # undef NEED_SNPRINTF_ONLY
293: # endif
294: # if !defined(PREFER_PORTABLE_SNPRINTF)
295: # define PREFER_PORTABLE_SNPRINTF
296: # endif
297: #endif
298:
299: #if defined(SOLARIS_BUG_COMPATIBLE) && !defined(SOLARIS_COMPATIBLE)
300: #define SOLARIS_COMPATIBLE
301: #endif
302:
303: #if defined(HPUX_BUG_COMPATIBLE) && !defined(HPUX_COMPATIBLE)
304: #define HPUX_COMPATIBLE
305: #endif
306:
307: #if defined(DIGITAL_UNIX_BUG_COMPATIBLE) && !defined(DIGITAL_UNIX_COMPATIBLE)
308: #define DIGITAL_UNIX_COMPATIBLE
309: #endif
310:
311: #if defined(PERL_BUG_COMPATIBLE) && !defined(PERL_COMPATIBLE)
312: #define PERL_COMPATIBLE
313: #endif
314:
315: #if defined(LINUX_BUG_COMPATIBLE) && !defined(LINUX_COMPATIBLE)
316: #define LINUX_COMPATIBLE
317: #endif
318:
319: #include <sys/types.h>
320: #include <string.h>
321: #include <stdlib.h>
322: #include <stdio.h>
323: #include <stdarg.h>
324: #include <assert.h>
325: #include <errno.h>
326:
327: #ifdef isdigit
328: #undef isdigit
329: #endif
330: #define isdigit(c) ((c) >= '0' && (c) <= '9')
331:
332: /* For copying strings longer or equal to 'breakeven_point'
333: * it is more efficient to call memcpy() than to do it inline.
334: * The value depends mostly on the processor architecture,
335: * but also on the compiler and its optimization capabilities.
336: * The value is not critical, some small value greater than zero
337: * will be just fine if you don't care to squeeze every drop
338: * of performance out of the code.
339: *
340: * Small values favor memcpy, large values favor inline code.
341: */
342: #if defined(__alpha__) || defined(__alpha)
1.1.1.2 ! root 343: # define breakeven_point 2 /* AXP (DEC Alpha) - gcc or cc or egcs */
1.1 root 344: #endif
345: #if defined(__i386__) || defined(__i386)
1.1.1.2 ! root 346: # define breakeven_point 12 /* Intel Pentium/Linux - gcc 2.96 */
1.1 root 347: #endif
348: #if defined(__hppa)
1.1.1.2 ! root 349: # define breakeven_point 10 /* HP-PA - gcc */
1.1 root 350: #endif
351: #if defined(__sparc__) || defined(__sparc)
1.1.1.2 ! root 352: # define breakeven_point 33 /* Sun Sparc 5 - gcc 2.8.1 */
1.1 root 353: #endif
354:
355: /* some other values of possible interest: */
1.1.1.2 ! root 356: /* #define breakeven_point 8 *//* VAX 4000 - vaxc */
! 357: /* #define breakeven_point 19 *//* VAX 4000 - gcc 2.7.0 */
1.1 root 358:
359: #ifndef breakeven_point
1.1.1.2 ! root 360: # define breakeven_point 6 /* some reasonable one-size-fits-all value */
1.1 root 361: #endif
362:
363: #define fast_memcpy(d,s,n) \
364: { register size_t nn = (size_t)(n); \
365: if (nn >= breakeven_point) memcpy((d), (s), nn); \
366: else if (nn > 0) { /* proc call overhead is worth only for large strings*/\
367: register char *dd; register const char *ss; \
368: for (ss=(s), dd=(d); nn>0; nn--) *dd++ = *ss++; } }
369:
370: #define fast_memset(d,c,n) \
371: { register size_t nn = (size_t)(n); \
372: if (nn >= breakeven_point) memset((d), (int)(c), nn); \
373: else if (nn > 0) { /* proc call overhead is worth only for large strings*/\
374: register char *dd; register const int cc=(int)(c); \
375: for (dd=(d); nn>0; nn--) *dd++ = cc; } }
376:
377: /* prototypes */
378:
379: #if defined(NEED_ASPRINTF)
1.1.1.2 ! root 380: int asprintf(char **ptr, const char *fmt, /*args */ ...);
1.1 root 381: #endif
382: #if defined(NEED_VASPRINTF)
1.1.1.2 ! root 383: int vasprintf(char **ptr, const char *fmt, va_list ap);
1.1 root 384: #endif
385: #if defined(NEED_ASNPRINTF)
1.1.1.2 ! root 386: int asnprintf(char **ptr, size_t str_m, const char *fmt, /*args */ ...);
1.1 root 387: #endif
388: #if defined(NEED_VASNPRINTF)
1.1.1.2 ! root 389: int vasnprintf(char **ptr, size_t str_m, const char *fmt, va_list ap);
1.1 root 390: #endif
391:
392: #if defined(HAVE_SNPRINTF)
393: /* declare our portable snprintf routine under name portable_snprintf */
394: /* declare our portable vsnprintf routine under name portable_vsnprintf */
395: #else
396: /* declare our portable routines under names snprintf and vsnprintf */
397: #define portable_snprintf snprintf
398: #if !defined(NEED_SNPRINTF_ONLY)
399: #define portable_vsnprintf vsnprintf
400: #endif
401: #endif
402:
403: #if !defined(HAVE_SNPRINTF) || defined(PREFER_PORTABLE_SNPRINTF)
1.1.1.2 ! root 404: int portable_snprintf(char *str, size_t str_m, const char *fmt, /*args */
! 405: ...);
1.1 root 406: #if !defined(NEED_SNPRINTF_ONLY)
407: int portable_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap);
408: #endif
409: #endif
410:
411: /* declarations */
412:
413: static char credits[] = "\n\
414: @(#)snprintf.c, v2.2: Mark Martinec, <[email protected]>\n\
415: @(#)snprintf.c, v2.2: Copyright 1999, Mark Martinec. Frontier Artistic License applies.\n\
416: @(#)snprintf.c, v2.2: http://www.ijs.si/software/snprintf/\n";
417:
418: #if defined(NEED_ASPRINTF)
1.1.1.2 ! root 419: int asprintf(char **ptr, const char *fmt, /*args */ ...)
! 420: {
1.1 root 421: va_list ap;
422: size_t str_m;
423: int str_l;
424:
425: *ptr = NULL;
1.1.1.2 ! root 426: va_start(ap, fmt); /* measure the required size */
! 427: str_l = portable_vsnprintf(NULL, (size_t) 0, fmt, ap);
1.1 root 428: va_end(ap);
1.1.1.2 ! root 429: assert(str_l >= 0); /* possible integer overflow if str_m > INT_MAX */
! 430: *ptr = (char *)malloc(str_m = (size_t) str_l + 1);
! 431: if (*ptr == NULL) {
! 432: errno = ENOMEM;
! 433: str_l = -1;
! 434: } else {
1.1 root 435: int str_l2;
436: va_start(ap, fmt);
437: str_l2 = portable_vsnprintf(*ptr, str_m, fmt, ap);
438: va_end(ap);
439: assert(str_l2 == str_l);
440: }
441: return str_l;
442: }
443: #endif
444:
445: #if defined(NEED_VASPRINTF)
1.1.1.2 ! root 446: int vasprintf(char **ptr, const char *fmt, va_list ap)
! 447: {
1.1 root 448: size_t str_m;
449: int str_l;
450:
451: *ptr = NULL;
1.1.1.2 ! root 452: {
! 453: va_list ap2;
! 454: va_copy(ap2, ap); /* don't consume the original ap, we'll need it again */
! 455: str_l = portable_vsnprintf(NULL, (size_t) 0, fmt, ap2); /*get required size */
1.1 root 456: va_end(ap2);
457: }
1.1.1.2 ! root 458: assert(str_l >= 0); /* possible integer overflow if str_m > INT_MAX */
! 459: *ptr = (char *)malloc(str_m = (size_t) str_l + 1);
! 460: if (*ptr == NULL) {
! 461: errno = ENOMEM;
! 462: str_l = -1;
! 463: } else {
1.1 root 464: int str_l2 = portable_vsnprintf(*ptr, str_m, fmt, ap);
465: assert(str_l2 == str_l);
466: }
467: return str_l;
468: }
469: #endif
470:
471: #if defined(NEED_ASNPRINTF)
1.1.1.2 ! root 472: int asnprintf(char **ptr, size_t str_m, const char *fmt, /*args */ ...)
! 473: {
1.1 root 474: va_list ap;
475: int str_l;
476:
477: *ptr = NULL;
1.1.1.2 ! root 478: va_start(ap, fmt); /* measure the required size */
! 479: str_l = portable_vsnprintf(NULL, (size_t) 0, fmt, ap);
1.1 root 480: va_end(ap);
1.1.1.2 ! root 481: assert(str_l >= 0); /* possible integer overflow if str_m > INT_MAX */
! 482: if ((size_t) str_l + 1 < str_m)
! 483: str_m = (size_t) str_l + 1; /* truncate */
1.1 root 484: /* if str_m is 0, no buffer is allocated, just set *ptr to NULL */
1.1.1.2 ! root 485: if (str_m == 0) { /* not interested in resulting string, just return size */
1.1 root 486: } else {
1.1.1.2 ! root 487: *ptr = (char *)malloc(str_m);
! 488: if (*ptr == NULL) {
! 489: errno = ENOMEM;
! 490: str_l = -1;
! 491: } else {
1.1 root 492: int str_l2;
493: va_start(ap, fmt);
494: str_l2 = portable_vsnprintf(*ptr, str_m, fmt, ap);
495: va_end(ap);
496: assert(str_l2 == str_l);
497: }
498: }
499: return str_l;
500: }
501: #endif
502:
503: #if defined(NEED_VASNPRINTF)
1.1.1.2 ! root 504: int vasnprintf(char **ptr, size_t str_m, const char *fmt, va_list ap)
! 505: {
1.1 root 506: int str_l;
507:
508: *ptr = NULL;
1.1.1.2 ! root 509: {
! 510: va_list ap2;
! 511: va_copy(ap2, ap); /* don't consume the original ap, we'll need it again */
! 512: str_l = portable_vsnprintf(NULL, (size_t) 0, fmt, ap2); /*get required size */
1.1 root 513: va_end(ap2);
514: }
1.1.1.2 ! root 515: assert(str_l >= 0); /* possible integer overflow if str_m > INT_MAX */
! 516: if ((size_t) str_l + 1 < str_m)
! 517: str_m = (size_t) str_l + 1; /* truncate */
1.1 root 518: /* if str_m is 0, no buffer is allocated, just set *ptr to NULL */
1.1.1.2 ! root 519: if (str_m == 0) { /* not interested in resulting string, just return size */
1.1 root 520: } else {
1.1.1.2 ! root 521: *ptr = (char *)malloc(str_m);
! 522: if (*ptr == NULL) {
! 523: errno = ENOMEM;
! 524: str_l = -1;
! 525: } else {
1.1 root 526: int str_l2 = portable_vsnprintf(*ptr, str_m, fmt, ap);
527: assert(str_l2 == str_l);
528: }
529: }
530: return str_l;
531: }
532: #endif
533:
534: /*
535: * If the system does have snprintf and the portable routine is not
536: * specifically required, this module produces no code for snprintf/vsnprintf.
537: */
538: #if !defined(HAVE_SNPRINTF) || defined(PREFER_PORTABLE_SNPRINTF)
539:
540: #if !defined(NEED_SNPRINTF_ONLY)
1.1.1.2 ! root 541: int portable_snprintf(char *str, size_t str_m, const char *fmt, /*args */ ...)
! 542: {
1.1 root 543: va_list ap;
544: int str_l;
545:
546: va_start(ap, fmt);
547: str_l = portable_vsnprintf(str, str_m, fmt, ap);
548: va_end(ap);
549: return str_l;
550: }
551: #endif
552:
553: #if defined(NEED_SNPRINTF_ONLY)
1.1.1.2 ! root 554: int portable_snprintf(char *str, size_t str_m, const char *fmt, /*args */ ...)
! 555: {
1.1 root 556: #else
1.1.1.2 ! root 557: int portable_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap)
! 558: {
1.1 root 559: #endif
560:
561: #if defined(NEED_SNPRINTF_ONLY)
562: va_list ap;
563: #endif
564: size_t str_l = 0;
565: const char *p = fmt;
566:
567: /* In contrast with POSIX, the ISO C99 now says
568: * that str can be NULL and str_m can be 0.
569: * This is more useful than the old: if (str_m < 1) return -1; */
570:
571: #if defined(NEED_SNPRINTF_ONLY)
572: va_start(ap, fmt);
573: #endif
1.1.1.2 ! root 574: if (!p)
! 575: p = "";
1.1 root 576: while (*p) {
577: if (*p != '%') {
1.1.1.2 ! root 578: /* if (str_l < str_m) str[str_l++] = *p++; -- this would be sufficient */
! 579: /* but the following code achieves better performance for cases
! 580: * where format string is long and contains few conversions */
! 581: const char *q = strchr(p + 1, '%');
! 582: size_t n = !q ? strlen(p) : (q - p);
1.1 root 583: if (str_l < str_m) {
1.1.1.2 ! root 584: size_t avail = str_m - str_l;
! 585: fast_memcpy(str + str_l, p, (n > avail ? avail : n));
1.1 root 586: }
1.1.1.2 ! root 587: p += n;
! 588: str_l += n;
1.1 root 589: } else {
590: const char *starting_p;
591: size_t min_field_width = 0, precision = 0;
592: int zero_padding = 0, precision_specified = 0, justify_left = 0;
593: int alternate_form = 0, force_sign = 0;
1.1.1.2 ! root 594: int space_for_positive = 1; /* If both the ' ' and '+' flags appear,
! 595: the ' ' flag should be ignored. */
! 596: char length_modifier = '\0'; /* allowed values: \0, h, l, L */
! 597: char tmp[32]; /* temporary buffer for simple numeric->string conversion */
1.1 root 598:
599: const char *str_arg; /* string address in case of string argument */
600: size_t str_arg_l; /* natural field width of arg without padding
601: and sign */
602: unsigned char uchar_arg;
1.1.1.2 ! root 603: /* unsigned char argument value - only defined for c conversion.
! 604: N.B. standard explicitly states the char argument for
! 605: the c conversion is unsigned */
1.1 root 606:
607: size_t number_of_zeros_to_pad = 0;
1.1.1.2 ! root 608: /* number of zeros to be inserted for numeric conversions
! 609: as required by the precision or minimal field width */
1.1 root 610:
611: size_t zero_padding_insertion_ind = 0;
1.1.1.2 ! root 612: /* index into tmp where zero padding is to be inserted */
1.1 root 613:
614: char fmt_spec = '\0';
1.1.1.2 ! root 615: /* current conversion specifier character */
1.1 root 616:
1.1.1.2 ! root 617: str_arg = credits; /* just to make compiler happy (defined but not used) */
1.1 root 618: str_arg = NULL;
1.1.1.2 ! root 619: starting_p = p;
! 620: p++; /* skip '%' */
! 621: /* parse flags */
1.1 root 622: while (*p == '0' || *p == '-' || *p == '+' ||
623: *p == ' ' || *p == '#' || *p == '\'') {
624: switch (*p) {
1.1.1.2 ! root 625: case '0':
! 626: zero_padding = 1;
! 627: break;
! 628: case '-':
! 629: justify_left = 1;
! 630: break;
! 631: case '+':
! 632: force_sign = 1;
! 633: space_for_positive = 0;
! 634: break;
! 635: case ' ':
! 636: force_sign = 1;
! 637: /* If both the ' ' and '+' flags appear, the ' ' flag should be ignored */
1.1 root 638: #ifdef PERL_COMPATIBLE
1.1.1.2 ! root 639: /* ... but in Perl the last of ' ' and '+' applies */
! 640: space_for_positive = 1;
1.1 root 641: #endif
1.1.1.2 ! root 642: break;
! 643: case '#':
! 644: alternate_form = 1;
! 645: break;
! 646: case '\'':
! 647: break;
1.1 root 648: }
649: p++;
650: }
1.1.1.2 ! root 651: /* If the '0' and '-' flags both appear, the '0' flag should be ignored. */
1.1 root 652:
1.1.1.2 ! root 653: /* parse field width */
1.1 root 654: if (*p == '*') {
655: int j;
1.1.1.2 ! root 656: p++;
! 657: j = va_arg(ap, int);
! 658: if (j >= 0)
! 659: min_field_width = j;
! 660: else {
! 661: min_field_width = -j;
! 662: justify_left = 1;
! 663: }
1.1 root 664: } else if (isdigit((int)(*p))) {
665: /* size_t could be wider than unsigned int;
666: make sure we treat argument like common implementations do */
667: unsigned int uj = *p++ - '0';
1.1.1.2 ! root 668: while (isdigit((int)(*p)))
! 669: uj = 10 * uj + (unsigned int)(*p++ - '0');
1.1 root 670: min_field_width = uj;
671: }
1.1.1.2 ! root 672: /* parse precision */
1.1 root 673: if (*p == '.') {
1.1.1.2 ! root 674: p++;
! 675: precision_specified = 1;
1.1 root 676: if (*p == '*') {
677: int j = va_arg(ap, int);
678: p++;
1.1.1.2 ! root 679: if (j >= 0)
! 680: precision = j;
1.1 root 681: else {
1.1.1.2 ! root 682: precision_specified = 0;
! 683: precision = 0;
! 684: /* NOTE:
! 685: * Solaris 2.6 man page claims that in this case the precision
! 686: * should be set to 0. Digital Unix 4.0, HPUX 10 and BSD man page
! 687: * claim that this case should be treated as unspecified precision,
! 688: * which is what we do here.
! 689: */
1.1 root 690: }
691: } else if (isdigit((int)(*p))) {
692: /* size_t could be wider than unsigned int;
693: make sure we treat argument like common implementations do */
694: unsigned int uj = *p++ - '0';
1.1.1.2 ! root 695: while (isdigit((int)(*p)))
! 696: uj = 10 * uj + (unsigned int)(*p++ - '0');
1.1 root 697: precision = uj;
698: }
699: }
1.1.1.2 ! root 700: /* parse 'h', 'l' and 'll' length modifiers */
1.1 root 701: if (*p == 'h' || *p == 'l') {
1.1.1.2 ! root 702: length_modifier = *p;
! 703: p++;
! 704: if (length_modifier == 'l' && *p == 'l') { /* double l = long long */
1.1 root 705: #ifdef SNPRINTF_LONGLONG_SUPPORT
1.1.1.2 ! root 706: length_modifier = '2'; /* double l encoded as '2' */
1.1 root 707: #else
1.1.1.2 ! root 708: length_modifier = 'l'; /* treat it as a single 'l' */
1.1 root 709: #endif
710: p++;
711: }
712: }
713: fmt_spec = *p;
1.1.1.2 ! root 714: /* common synonyms: */
1.1 root 715: switch (fmt_spec) {
1.1.1.2 ! root 716: case 'i':
! 717: fmt_spec = 'd';
! 718: break;
! 719: case 'D':
! 720: fmt_spec = 'd';
! 721: length_modifier = 'l';
! 722: break;
! 723: case 'U':
! 724: fmt_spec = 'u';
! 725: length_modifier = 'l';
! 726: break;
! 727: case 'O':
! 728: fmt_spec = 'o';
! 729: length_modifier = 'l';
! 730: break;
! 731: default:
! 732: break;
1.1 root 733: }
1.1.1.2 ! root 734: /* get parameter value, do initial processing */
1.1 root 735: switch (fmt_spec) {
1.1.1.2 ! root 736: case '%': /* % behaves similar to 's' regarding flags and field widths */
! 737: case 'c': /* c behaves similar to 's' regarding flags and field widths */
1.1 root 738: case 's':
1.1.1.2 ! root 739: length_modifier = '\0'; /* wint_t and wchar_t not supported */
! 740: /* the result of zero padding flag with non-numeric conversion specifier */
! 741: /* is undefined. Solaris and HPUX 10 does zero padding in this case, */
! 742: /* Digital Unix and Linux does not. */
1.1 root 743: #if !defined(SOLARIS_COMPATIBLE) && !defined(HPUX_COMPATIBLE)
1.1.1.2 ! root 744: zero_padding = 0; /* turn zero padding off for string conversions */
1.1 root 745: #endif
746: str_arg_l = 1;
747: switch (fmt_spec) {
748: case '%':
1.1.1.2 ! root 749: str_arg = p;
1.1 root 750: break;
1.1.1.2 ! root 751: case 'c':
! 752: {
! 753: int j = va_arg(ap, int);
! 754: uchar_arg = (unsigned char)j; /* standard demands unsigned char */
! 755: str_arg = (const char *)&uchar_arg;
! 756: break;
! 757: }
1.1 root 758: case 's':
759: str_arg = va_arg(ap, const char *);
1.1.1.2 ! root 760: if (!str_arg)
! 761: str_arg_l = 0;
! 762: /* make sure not to address string beyond the specified precision !!! */
! 763: else if (!precision_specified)
! 764: str_arg_l = strlen(str_arg);
! 765: /* truncate string if necessary as requested by precision */
! 766: else if (precision == 0)
! 767: str_arg_l = 0;
1.1 root 768: else {
1.1.1.2 ! root 769: /* memchr on HP does not like n > 2^31 !!! */
1.1 root 770: const char *q = memchr(str_arg, '\0',
1.1.1.2 ! root 771: precision <=
! 772: 0x7fffffff ? precision : 0x7fffffff);
! 773: str_arg_l = !q ? precision : (q - str_arg);
1.1 root 774: }
775: break;
1.1.1.2 ! root 776: default:
! 777: break;
1.1 root 778: }
779: break;
1.1.1.2 ! root 780: case 'd':
! 781: case 'u':
! 782: case 'o':
! 783: case 'x':
! 784: case 'X':
! 785: case 'p':
! 786: {
! 787: /* NOTE: the u, o, x, X and p conversion specifiers imply
! 788: the value is unsigned; d implies a signed value */
1.1 root 789:
1.1.1.2 ! root 790: int arg_sign = 0;
1.1 root 791: /* 0 if numeric argument is zero (or if pointer is NULL for 'p'),
1.1.1.2 ! root 792: +1 if greater than zero (or nonzero for unsigned arguments),
! 793: -1 if negative (unsigned argument is never negative) */
1.1 root 794:
1.1.1.2 ! root 795: int int_arg = 0;
! 796: unsigned int uint_arg = 0;
1.1 root 797: /* only defined for length modifier h, or for no length modifiers */
798:
1.1.1.2 ! root 799: long int long_arg = 0;
! 800: unsigned long int ulong_arg = 0;
1.1 root 801: /* only defined for length modifier l */
802:
1.1.1.2 ! root 803: void *ptr_arg = NULL;
1.1 root 804: /* pointer argument value -only defined for p conversion */
805:
806: #ifdef SNPRINTF_LONGLONG_SUPPORT
1.1.1.2 ! root 807: long long int long_long_arg = 0;
! 808: unsigned long long int ulong_long_arg = 0;
1.1 root 809: /* only defined for length modifier ll */
810: #endif
1.1.1.2 ! root 811: if (fmt_spec == 'p') {
! 812: /* HPUX 10: An l, h, ll or L before any other conversion character
! 813: * (other than d, i, u, o, x, or X) is ignored.
! 814: * Digital Unix:
! 815: * not specified, but seems to behave as HPUX does.
! 816: * Solaris: If an h, l, or L appears before any other conversion
! 817: * specifier (other than d, i, u, o, x, or X), the behavior
! 818: * is undefined. (Actually %hp converts only 16-bits of address
! 819: * and %llp treats address as 64-bit data which is incompatible
! 820: * with (void *) argument on a 32-bit system).
! 821: */
1.1 root 822: #ifdef SOLARIS_COMPATIBLE
823: # ifdef SOLARIS_BUG_COMPATIBLE
1.1.1.2 ! root 824: /* keep length modifiers even if it represents 'll' */
1.1 root 825: # else
1.1.1.2 ! root 826: if (length_modifier == '2')
! 827: length_modifier = '\0';
1.1 root 828: # endif
829: #else
1.1.1.2 ! root 830: length_modifier = '\0';
1.1 root 831: #endif
1.1.1.2 ! root 832: ptr_arg = va_arg(ap, void *);
! 833: if (ptr_arg != NULL)
! 834: arg_sign = 1;
! 835: } else if (fmt_spec == 'd') { /* signed */
! 836: switch (length_modifier) {
! 837: case '\0':
! 838: case 'h':
! 839: /* It is non-portable to specify a second argument of char or short
! 840: * to va_arg, because arguments seen by the called function
! 841: * are not char or short. C converts char and short arguments
! 842: * to int before passing them to a function.
! 843: */
! 844: int_arg = va_arg(ap, int);
! 845: if (int_arg > 0)
! 846: arg_sign = 1;
! 847: else if (int_arg < 0)
! 848: arg_sign = -1;
! 849: break;
! 850: case 'l':
! 851: long_arg = va_arg(ap, long int);
! 852: if (long_arg > 0)
! 853: arg_sign = 1;
! 854: else if (long_arg < 0)
! 855: arg_sign = -1;
! 856: break;
1.1 root 857: #ifdef SNPRINTF_LONGLONG_SUPPORT
1.1.1.2 ! root 858: case '2':
! 859: long_long_arg = va_arg(ap, long long int);
! 860: if (long_long_arg > 0)
! 861: arg_sign = 1;
! 862: else if (long_long_arg < 0)
! 863: arg_sign = -1;
! 864: break;
1.1 root 865: #endif
1.1.1.2 ! root 866: }
! 867: } else { /* unsigned */
! 868: switch (length_modifier) {
! 869: case '\0':
! 870: case 'h':
! 871: uint_arg = va_arg(ap, unsigned int);
! 872: if (uint_arg)
! 873: arg_sign = 1;
! 874: break;
! 875: case 'l':
! 876: ulong_arg = va_arg(ap, unsigned long int);
! 877: if (ulong_arg)
! 878: arg_sign = 1;
! 879: break;
1.1 root 880: #ifdef SNPRINTF_LONGLONG_SUPPORT
1.1.1.2 ! root 881: case '2':
! 882: ulong_long_arg = va_arg(ap, unsigned long long int);
! 883: if (ulong_long_arg)
! 884: arg_sign = 1;
! 885: break;
1.1 root 886: #endif
1.1.1.2 ! root 887: }
1.1 root 888: }
1.1.1.2 ! root 889: str_arg = tmp;
! 890: str_arg_l = 0;
! 891: /* NOTE:
! 892: * For d, i, u, o, x, and X conversions, if precision is specified,
! 893: * the '0' flag should be ignored. This is so with Solaris 2.6,
! 894: * Digital UNIX 4.0, HPUX 10, Linux, FreeBSD, NetBSD; but not with Perl.
! 895: */
1.1 root 896: #ifndef PERL_COMPATIBLE
1.1.1.2 ! root 897: if (precision_specified)
! 898: zero_padding = 0;
1.1 root 899: #endif
1.1.1.2 ! root 900: if (fmt_spec == 'd') {
! 901: if (force_sign && arg_sign >= 0)
! 902: tmp[str_arg_l++] = space_for_positive ? ' ' : '+';
! 903: /* leave negative numbers for sprintf to handle,
! 904: to avoid handling tricky cases like (short int)(-32768) */
1.1 root 905: #ifdef LINUX_COMPATIBLE
1.1.1.2 ! root 906: } else if (fmt_spec == 'p' && force_sign && arg_sign > 0) {
! 907: tmp[str_arg_l++] = space_for_positive ? ' ' : '+';
1.1 root 908: #endif
1.1.1.2 ! root 909: } else if (alternate_form) {
! 910: if (arg_sign != 0 && (fmt_spec == 'x' || fmt_spec == 'X')) {
! 911: tmp[str_arg_l++] = '0';
! 912: tmp[str_arg_l++] = fmt_spec;
! 913: }
! 914: /* alternate form should have no effect for p conversion, but ... */
1.1 root 915: #ifdef HPUX_COMPATIBLE
1.1.1.2 ! root 916: else if (fmt_spec == 'p'
! 917: /* HPUX 10: for an alternate form of p conversion,
! 918: * a nonzero result is prefixed by 0x. */
1.1 root 919: #ifndef HPUX_BUG_COMPATIBLE
1.1.1.2 ! root 920: /* Actually it uses 0x prefix even for a zero value. */
! 921: && arg_sign != 0
1.1 root 922: #endif
1.1.1.2 ! root 923: ) {
! 924: tmp[str_arg_l++] = '0';
! 925: tmp[str_arg_l++] = 'x';
! 926: }
1.1 root 927: #endif
1.1.1.2 ! root 928: }
! 929: zero_padding_insertion_ind = str_arg_l;
! 930: if (!precision_specified)
! 931: precision = 1; /* default precision is 1 */
! 932: if (precision == 0 && arg_sign == 0
1.1 root 933: #if defined(HPUX_BUG_COMPATIBLE) || defined(LINUX_COMPATIBLE)
1.1.1.2 ! root 934: && fmt_spec != 'p'
! 935: /* HPUX 10 man page claims: With conversion character p the result of
! 936: * converting a zero value with a precision of zero is a null string.
! 937: * Actually HP returns all zeroes, and Linux returns "(nil)". */
! 938: #endif
! 939: ) {
! 940: /* converted to null string */
! 941: /* When zero value is formatted with an explicit precision 0,
! 942: the resulting formatted string is empty (d, i, u, o, x, X, p). */
! 943: } else {
! 944: char f[5];
! 945: int f_l = 0;
! 946: f[f_l++] = '%'; /* construct a simple format string for sprintf */
! 947: if (!length_modifier) {
! 948: } else if (length_modifier == '2') {
! 949: f[f_l++] = 'l';
! 950: f[f_l++] = 'l';
! 951: } else
! 952: f[f_l++] = length_modifier;
! 953: f[f_l++] = fmt_spec;
! 954: f[f_l++] = '\0';
! 955: if (fmt_spec == 'p')
! 956: str_arg_l += sprintf(tmp + str_arg_l, f, ptr_arg);
! 957: else if (fmt_spec == 'd') { /* signed */
! 958: switch (length_modifier) {
! 959: case '\0':
! 960: case 'h':
! 961: str_arg_l += sprintf(tmp + str_arg_l, f, int_arg);
! 962: break;
! 963: case 'l':
! 964: str_arg_l += sprintf(tmp + str_arg_l, f, long_arg);
! 965: break;
1.1 root 966: #ifdef SNPRINTF_LONGLONG_SUPPORT
1.1.1.2 ! root 967: case '2':
! 968: str_arg_l += sprintf(tmp + str_arg_l, f, long_long_arg);
! 969: break;
! 970: #endif
! 971: }
! 972: } else { /* unsigned */
! 973: switch (length_modifier) {
! 974: case '\0':
! 975: case 'h':
! 976: str_arg_l += sprintf(tmp + str_arg_l, f, uint_arg);
! 977: break;
! 978: case 'l':
! 979: str_arg_l += sprintf(tmp + str_arg_l, f, ulong_arg);
! 980: break;
1.1 root 981: #ifdef SNPRINTF_LONGLONG_SUPPORT
1.1.1.2 ! root 982: case '2':
! 983: str_arg_l += sprintf(tmp + str_arg_l, f, ulong_long_arg);
! 984: break;
1.1 root 985: #endif
1.1.1.2 ! root 986: }
! 987: }
! 988: /* include the optional minus sign and possible "0x"
! 989: in the region before the zero padding insertion point */
! 990: if (zero_padding_insertion_ind < str_arg_l &&
! 991: tmp[zero_padding_insertion_ind] == '-') {
! 992: zero_padding_insertion_ind++;
! 993: }
! 994: if (zero_padding_insertion_ind + 1 < str_arg_l &&
! 995: tmp[zero_padding_insertion_ind] == '0' &&
! 996: (tmp[zero_padding_insertion_ind + 1] == 'x' ||
! 997: tmp[zero_padding_insertion_ind + 1] == 'X')) {
! 998: zero_padding_insertion_ind += 2;
1.1 root 999: }
1000: }
1.1.1.2 ! root 1001: {
! 1002: size_t num_of_digits = str_arg_l - zero_padding_insertion_ind;
! 1003: if (alternate_form && fmt_spec == 'o'
! 1004: #ifdef HPUX_COMPATIBLE /* ("%#.o",0) -> "" */
! 1005: && (str_arg_l > 0)
1.1 root 1006: #endif
1.1.1.2 ! root 1007: #ifdef DIGITAL_UNIX_BUG_COMPATIBLE /* ("%#o",0) -> "00" */
1.1 root 1008: #else
1.1.1.2 ! root 1009: /* unless zero is already the first character */
! 1010: && !(zero_padding_insertion_ind < str_arg_l
! 1011: && tmp[zero_padding_insertion_ind] == '0')
! 1012: #endif
! 1013: ) { /* assure leading zero for alternate-form octal numbers */
! 1014: if (!precision_specified || precision < num_of_digits + 1) {
! 1015: /* precision is increased to force the first character to be zero,
! 1016: except if a zero value is formatted with an explicit precision
! 1017: of zero */
! 1018: precision = num_of_digits + 1;
! 1019: precision_specified = 1;
! 1020: }
1.1 root 1021: }
1.1.1.2 ! root 1022: /* zero padding to specified precision? */
! 1023: if (num_of_digits < precision)
! 1024: number_of_zeros_to_pad = precision - num_of_digits;
! 1025: }
! 1026: /* zero padding to specified minimal field width? */
! 1027: if (!justify_left && zero_padding) {
! 1028: int n = min_field_width - (str_arg_l + number_of_zeros_to_pad);
! 1029: if (n > 0)
! 1030: number_of_zeros_to_pad += n;
1.1 root 1031: }
1.1.1.2 ! root 1032: break;
1.1 root 1033: }
1.1.1.2 ! root 1034: default: /* unrecognized conversion specifier, keep format string as-is */
! 1035: zero_padding = 0; /* turn zero padding off for non-numeric convers. */
1.1 root 1036: #ifndef DIGITAL_UNIX_COMPATIBLE
1.1.1.2 ! root 1037: justify_left = 1;
! 1038: min_field_width = 0; /* reset flags */
1.1 root 1039: #endif
1040: #if defined(PERL_COMPATIBLE) || defined(LINUX_COMPATIBLE)
1.1.1.2 ! root 1041: /* keep the entire format string unchanged */
! 1042: str_arg = starting_p;
! 1043: str_arg_l = p - starting_p;
! 1044: /* well, not exactly so for Linux, which does something inbetween,
! 1045: * and I don't feel an urge to imitate it: "%+++++hy" -> "%+y" */
1.1 root 1046: #else
1.1.1.2 ! root 1047: /* discard the unrecognized conversion, just keep *
! 1048: * the unrecognized conversion character */
! 1049: str_arg = p;
! 1050: str_arg_l = 0;
! 1051: #endif
! 1052: if (*p)
! 1053: str_arg_l++; /* include invalid conversion specifier unchanged
! 1054: if not at end-of-string */
1.1 root 1055: break;
1056: }
1.1.1.2 ! root 1057: if (*p)
! 1058: p++; /* step over the just processed conversion specifier */
! 1059: /* insert padding to the left as requested by min_field_width;
! 1060: this does not include the zero padding in case of numerical conversions */
! 1061: if (!justify_left) { /* left padding with blank or zero */
! 1062: int n = min_field_width - (str_arg_l + number_of_zeros_to_pad);
1.1 root 1063: if (n > 0) {
1064: if (str_l < str_m) {
1.1.1.2 ! root 1065: size_t avail = str_m - str_l;
! 1066: fast_memset(str + str_l, (zero_padding ? '0' : ' '),
! 1067: (n > avail ? avail : n));
1.1 root 1068: }
1069: str_l += n;
1070: }
1071: }
1.1.1.2 ! root 1072: /* zero padding as requested by the precision or by the minimal field width
! 1073: * for numeric conversions required? */
1.1 root 1074: if (number_of_zeros_to_pad <= 0) {
1.1.1.2 ! root 1075: /* will not copy first part of numeric right now, *
! 1076: * force it to be copied later in its entirety */
1.1 root 1077: zero_padding_insertion_ind = 0;
1078: } else {
1.1.1.2 ! root 1079: /* insert first part of numerics (sign or '0x') before zero padding */
1.1 root 1080: int n = zero_padding_insertion_ind;
1081: if (n > 0) {
1082: if (str_l < str_m) {
1.1.1.2 ! root 1083: size_t avail = str_m - str_l;
! 1084: fast_memcpy(str + str_l, str_arg, (n > avail ? avail : n));
1.1 root 1085: }
1086: str_l += n;
1087: }
1.1.1.2 ! root 1088: /* insert zero padding as requested by the precision or min field width */
1.1 root 1089: n = number_of_zeros_to_pad;
1090: if (n > 0) {
1091: if (str_l < str_m) {
1.1.1.2 ! root 1092: size_t avail = str_m - str_l;
! 1093: fast_memset(str + str_l, '0', (n > avail ? avail : n));
1.1 root 1094: }
1095: str_l += n;
1096: }
1097: }
1.1.1.2 ! root 1098: /* insert formatted string
! 1099: * (or as-is conversion specifier for unknown conversions) */
! 1100: {
! 1101: int n = str_arg_l - zero_padding_insertion_ind;
1.1 root 1102: if (n > 0) {
1103: if (str_l < str_m) {
1.1.1.2 ! root 1104: size_t avail = str_m - str_l;
! 1105: fast_memcpy(str + str_l,
! 1106: str_arg + zero_padding_insertion_ind,
! 1107: (n > avail ? avail : n));
1.1 root 1108: }
1109: str_l += n;
1110: }
1111: }
1.1.1.2 ! root 1112: /* insert right padding */
! 1113: if (justify_left) { /* right blank padding to the field width */
! 1114: int n = min_field_width - (str_arg_l + number_of_zeros_to_pad);
1.1 root 1115: if (n > 0) {
1116: if (str_l < str_m) {
1.1.1.2 ! root 1117: size_t avail = str_m - str_l;
! 1118: fast_memset(str + str_l, ' ', (n > avail ? avail : n));
1.1 root 1119: }
1120: str_l += n;
1121: }
1122: }
1123: }
1124: }
1125: #if defined(NEED_SNPRINTF_ONLY)
1126: va_end(ap);
1127: #endif
1.1.1.2 ! root 1128: if (str_m > 0) { /* make sure the string is null-terminated
! 1129: even at the expense of overwriting the last character
! 1130: (shouldn't happen, but just in case) */
! 1131: str[str_l <= str_m - 1 ? str_l : str_m - 1] = '\0';
1.1 root 1132: }
1133: /* Return the number of characters formatted (excluding trailing null
1134: * character), that is, the number of characters that would have been
1135: * written to the buffer if it were large enough.
1136: *
1137: * The value of str_l should be returned, but str_l is of unsigned type
1138: * size_t, and snprintf is int, possibly leading to an undetected
1139: * integer overflow, resulting in a negative return value, which is illegal.
1140: * Both XSH5 and ISO C99 (at least the draft) are silent on this issue.
1141: * Should errno be set to EOVERFLOW and EOF returned in this case???
1142: */
1.1.1.2 ! root 1143: return (int)str_l;
1.1 root 1144: }
1145: #endif
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