2
* snprintf.c - a portable implementation of snprintf
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* Mark Martinec <mark.martinec@ijs.si>, April 1999.
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* Copyright 1999, Mark Martinec. All rights reserved.
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the "Frontier Artistic License" which comes
14
* This program is distributed in the hope that it will be useful,
15
* but WITHOUT ANY WARRANTY; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the Frontier Artistic License for more details.
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* You should have received a copy of the Frontier Artistic License
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* with this Kit in the file named LICENSE.txt .
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* If not, I'll be glad to provide one.
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* - careful adherence to specs regarding flags, field width and precision;
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* - good performance for large string handling (large format, large
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* argument or large paddings). Performance is similar to system's sprintf
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* and in several cases significantly better (make sure you compile with
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* optimizations turned on, tell the compiler the code is strict ANSI
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* if necessary to give it more freedom for optimizations);
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* - return value semantics per ISO/IEC 9899:1999 ("ISO C99");
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* - written in standard ISO/ANSI C - requires an ANSI C compiler.
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* SUPPORTED CONVERSION SPECIFIERS AND DATA TYPES
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* This snprintf only supports the following conversion specifiers:
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* s, c, d, u, o, x, X, p (and synonyms: i, D, U, O - see below)
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* with flags: '-', '+', ' ', '0' and '#'.
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* An asterisk is supported for field width as well as precision.
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* Length modifiers 'h' (short int), 'l' (long int),
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* and 'll' (long long int) are supported.
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* If macro SNPRINTF_LONGLONG_SUPPORT is not defined (default) the
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* length modifier 'll' is recognized but treated the same as 'l',
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* which may cause argument value truncation! Defining
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* SNPRINTF_LONGLONG_SUPPORT requires that your system's sprintf also
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* handles length modifier 'll'. long long int is a language extension
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* which may not be portable.
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* Conversion of numeric data (conversion specifiers d, u, o, x, X, p)
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* with length modifiers (none or h, l, ll) is left to the system routine
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* sprintf, but all handling of flags, field width and precision as well as
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* c and s conversions is done very carefully by this portable routine.
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* If a string precision (truncation) is specified (e.g. %.8s) it is
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* guaranteed the string beyond the specified precision will not be referenced.
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* Length modifiers h, l and ll are ignored for c and s conversions (data
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* types wint_t and wchar_t are not supported).
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* The following common synonyms for conversion characters are supported:
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* - i is a synonym for d
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* - D is a synonym for ld, explicit length modifiers are ignored
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* - U is a synonym for lu, explicit length modifiers are ignored
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* - O is a synonym for lo, explicit length modifiers are ignored
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* The D, O and U conversion characters are nonstandard, they are supported
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* for backward compatibility only, and should not be used for new code.
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* The following is specifically NOT supported:
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* - flag ' (thousands' grouping character) is recognized but ignored
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* - numeric conversion specifiers: f, e, E, g, G and synonym F,
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* as well as the new a and A conversion specifiers
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* - length modifier 'L' (long double) and 'q' (quad - use 'll' instead)
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* - wide character/string conversions: lc, ls, and nonstandard
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* - writeback of converted string length: conversion character n
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* - the n$ specification for direct reference to n-th argument
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* It is permitted for str_m to be zero, and it is permitted to specify NULL
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* pointer for resulting string argument if str_m is zero (as per ISO C99).
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* The return value is the number of characters which would be generated
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* for the given input, excluding the trailing null. If this value
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* is greater or equal to str_m, not all characters from the result
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* have been stored in str, output bytes beyond the (str_m-1) -th character
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* are discarded. If str_m is greater than zero it is guaranteed
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* the resulting string will be null-terminated.
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* NOTE that this matches the ISO C99, OpenBSD, and GNU C library 2.1,
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* but is different from some older and vendor implementations,
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* and is also different from XPG, XSH5, SUSv2 specifications.
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* For historical discussion on changes in the semantics and standards
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* of snprintf see printf(3) man page in the Linux programmers manual.
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* Routines asprintf and vasprintf return a pointer (in the ptr argument)
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* to a buffer sufficiently large to hold the resulting string. This pointer
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* should be passed to free(3) to release the allocated storage when it is
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* no longer needed. If sufficient space cannot be allocated, these functions
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* will return -1 and set ptr to be a NULL pointer. These two routines are a
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* GNU C library extensions (glibc).
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* Routines asnprintf and vasnprintf are similar to asprintf and vasprintf,
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* yet, like snprintf and vsnprintf counterparts, will write at most str_m-1
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* characters into the allocated output string, the last character in the
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* allocated buffer then gets the terminating null. If the formatted string
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* length (the return value) is greater than or equal to the str_m argument,
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* the resulting string was truncated and some of the formatted characters
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* were discarded. These routines present a handy way to limit the amount
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* of allocated memory to some sane value.
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* http://www.ijs.si/software/snprintf/
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* 1999-04 V0.9 Mark Martinec
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* - initial version, some modifications after comparing printf
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* man pages for Digital Unix 4.0, Solaris 2.6 and HPUX 10,
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* and checking how Perl handles sprintf (differently!);
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* 1999-04-09 V1.0 Mark Martinec <mark.martinec@ijs.si>
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* - added main test program, fixed remaining inconsistencies,
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* added optional (long long int) support;
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* 1999-04-12 V1.1 Mark Martinec <mark.martinec@ijs.si>
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* - support the 'p' conversion (pointer to void);
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* - if a string precision is specified
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* make sure the string beyond the specified precision
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* will not be referenced (e.g. by strlen);
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* 1999-04-13 V1.2 Mark Martinec <mark.martinec@ijs.si>
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* - support synonyms %D=%ld, %U=%lu, %O=%lo;
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* - speed up the case of long format string with few conversions;
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* 1999-06-30 V1.3 Mark Martinec <mark.martinec@ijs.si>
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* - fixed runaway loop (eventually crashing when str_l wraps
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* beyond 2^31) while copying format string without
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* conversion specifiers to a buffer that is too short
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* (thanks to Edwin Young <edwiny@autonomy.com> for
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* spotting the problem);
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* - added macros PORTABLE_SNPRINTF_VERSION_(MAJOR|MINOR)
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* 2000-02-14 V2.0 (never released) Mark Martinec <mark.martinec@ijs.si>
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* - relaxed license terms: The Artistic License now applies.
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* You may still apply the GNU GENERAL PUBLIC LICENSE
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* as was distributed with previous versions, if you prefer;
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* - changed REVISION HISTORY dates to use ISO 8601 date format;
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* - added vsnprintf (patch also independently proposed by
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* Caolan McNamara 2000-05-04, and Keith M Willenson 2000-06-01)
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* 2000-06-27 V2.1 Mark Martinec <mark.martinec@ijs.si>
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* - removed POSIX check for str_m<1; value 0 for str_m is
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* allowed by ISO C99 (and GNU C library 2.1) - (pointed out
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* on 2000-05-04 by Caolan McNamara, caolan@ csn dot ul dot ie).
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* Besides relaxed license this change in standards adherence
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* is the main reason to bump up the major version number;
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* - added nonstandard routines asnprintf, vasnprintf, asprintf,
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* vasprintf that dynamically allocate storage for the
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* resulting string; these routines are not compiled by default,
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* see comments where NEED_V?ASN?PRINTF macros are defined;
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* - autoconf contributed by Caolan McNamara
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* 2000-10-06 V2.2 Mark Martinec <mark.martinec@ijs.si>
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* - BUG FIX: the %c conversion used a temporary variable
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* that was no longer in scope when referenced,
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* possibly causing incorrect resulting character;
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* - BUG FIX: make precision and minimal field width unsigned
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* to handle huge values (2^31 <= n < 2^32) correctly;
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* also be more careful in the use of signed/unsigned/size_t
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* internal variables - probably more careful than many
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* vendor implementations, but there may still be a case
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* where huge values of str_m, precision or minimal field
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* could cause incorrect behaviour;
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* - use separate variables for signed/unsigned arguments,
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* and for short/int, long, and long long argument lengths
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* to avoid possible incompatibilities on certain
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* computer architectures. Also use separate variable
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* arg_sign to hold sign of a numeric argument,
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* to make code more transparent;
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* - some fiddling with zero padding and "0x" to make it
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* - systematically use macros fast_memcpy and fast_memset
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* instead of case-by-case hand optimization; determine some
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* breakeven string lengths for different architectures;
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* - terminology change: 'format' -> 'conversion specifier',
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* 'C9x' -> 'ISO/IEC 9899:1999 ("ISO C99")',
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* 'alternative form' -> 'alternate form',
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* 'data type modifier' -> 'length modifier';
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* - several comments rephrased and new ones added;
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* - make compiler not complain about 'credits' defined but
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/* Define HAVE_SNPRINTF if your system already has snprintf and vsnprintf.
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* If HAVE_SNPRINTF is defined this module will not produce code for
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* snprintf and vsnprintf, unless PREFER_PORTABLE_SNPRINTF is defined as well,
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* causing this portable version of snprintf to be called portable_snprintf
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* (and portable_vsnprintf).
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/* #define HAVE_SNPRINTF */
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/* Define PREFER_PORTABLE_SNPRINTF if your system does have snprintf and
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* vsnprintf but you would prefer to use the portable routine(s) instead.
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* In this case the portable routine is declared as portable_snprintf
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* (and portable_vsnprintf) and a macro 'snprintf' (and 'vsnprintf')
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* is defined to expand to 'portable_v?snprintf' - see file snprintf.h .
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* Defining this macro is only useful if HAVE_SNPRINTF is also defined,
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* but does does no harm if defined nevertheless.
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/* #define PREFER_PORTABLE_SNPRINTF */
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/* Define SNPRINTF_LONGLONG_SUPPORT if you want to support
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* data type (long long int) and length modifier 'll' (e.g. %lld).
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* If undefined, 'll' is recognized but treated as a single 'l'.
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* If the system's sprintf does not handle 'll'
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* the SNPRINTF_LONGLONG_SUPPORT must not be defined!
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* This is off by default as (long long int) is a language extension.
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/* #define SNPRINTF_LONGLONG_SUPPORT */
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/* Define NEED_SNPRINTF_ONLY if you only need snprintf, and not vsnprintf.
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* If NEED_SNPRINTF_ONLY is defined, the snprintf will be defined directly,
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* otherwise both snprintf and vsnprintf routines will be defined
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* and snprintf will be a simple wrapper around vsnprintf, at the expense
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* of an extra procedure call.
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/* #define NEED_SNPRINTF_ONLY */
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/* Define NEED_V?ASN?PRINTF macros if you need library extension
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* routines asprintf, vasprintf, asnprintf, vasnprintf respectively,
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* and your system library does not provide them. They are all small
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* wrapper routines around portable_vsnprintf. Defining any of the four
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* NEED_V?ASN?PRINTF macros automatically turns off NEED_SNPRINTF_ONLY
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* and turns on PREFER_PORTABLE_SNPRINTF.
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* Watch for name conflicts with the system library if these routines
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* are already present there.
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* NOTE: vasprintf and vasnprintf routines need va_copy() from stdarg.h, as
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* specified by C99, to be able to traverse the same list of arguments twice.
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* I don't know of any other standard and portable way of achieving the same.
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* With some versions of gcc you may use __va_copy(). You might even get away
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* with "ap2 = ap", in this case you must not call va_end(ap2) !
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* #define va_copy(ap2,ap) ap2 = ap
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/* #define NEED_ASPRINTF */
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/* #define NEED_ASNPRINTF */
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/* #define NEED_VASPRINTF */
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/* #define NEED_VASNPRINTF */
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/* Define the following macros if desired:
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* SOLARIS_COMPATIBLE, SOLARIS_BUG_COMPATIBLE,
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* HPUX_COMPATIBLE, HPUX_BUG_COMPATIBLE, LINUX_COMPATIBLE,
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* DIGITAL_UNIX_COMPATIBLE, DIGITAL_UNIX_BUG_COMPATIBLE,
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* PERL_COMPATIBLE, PERL_BUG_COMPATIBLE,
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* - For portable applications it is best not to rely on peculiarities
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* of a given implementation so it may be best not to define any
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* of the macros that select compatibility and to avoid features
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* that vary among the systems.
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* - Selecting compatibility with more than one operating system
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* is not strictly forbidden but is not recommended.
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* - 'x'_BUG_COMPATIBLE implies 'x'_COMPATIBLE .
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* - 'x'_COMPATIBLE refers to (and enables) a behaviour that is
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* documented in a sprintf man page on a given operating system
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* and actually adhered to by the system's sprintf (but not on
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* most other operating systems). It may also refer to and enable
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* a behaviour that is declared 'undefined' or 'implementation specific'
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* in the man page but a given implementation behaves predictably
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* - 'x'_BUG_COMPATIBLE refers to (and enables) a behaviour of system's sprintf
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* that contradicts the sprintf man page on the same operating system.
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* - I do not claim that the 'x'_COMPATIBLE and 'x'_BUG_COMPATIBLE
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* conditionals take into account all idiosyncrasies of a particular
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* implementation, there may be other incompatibilities.
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/* ============================================= */
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/* NO USER SERVICABLE PARTS FOLLOWING THIS POINT */
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/* ============================================= */
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#define PORTABLE_SNPRINTF_VERSION_MAJOR 2
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#define PORTABLE_SNPRINTF_VERSION_MINOR 2
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#if defined(NEED_ASPRINTF) || defined(NEED_ASNPRINTF) || defined(NEED_VASPRINTF) || defined(NEED_VASNPRINTF)
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# if defined(NEED_SNPRINTF_ONLY)
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# undef NEED_SNPRINTF_ONLY
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# if !defined(PREFER_PORTABLE_SNPRINTF)
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# define PREFER_PORTABLE_SNPRINTF
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#if defined(SOLARIS_BUG_COMPATIBLE) && !defined(SOLARIS_COMPATIBLE)
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#define SOLARIS_COMPATIBLE
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#if defined(HPUX_BUG_COMPATIBLE) && !defined(HPUX_COMPATIBLE)
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#define HPUX_COMPATIBLE
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#if defined(DIGITAL_UNIX_BUG_COMPATIBLE) && !defined(DIGITAL_UNIX_COMPATIBLE)
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#define DIGITAL_UNIX_COMPATIBLE
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#if defined(PERL_BUG_COMPATIBLE) && !defined(PERL_COMPATIBLE)
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#define PERL_COMPATIBLE
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#if defined(LINUX_BUG_COMPATIBLE) && !defined(LINUX_COMPATIBLE)
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#define LINUX_COMPATIBLE
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#include <sys/types.h>
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#define isdigit(c) ((c) >= '0' && (c) <= '9')
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/* For copying strings longer or equal to 'breakeven_point'
333
* it is more efficient to call memcpy() than to do it inline.
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* The value depends mostly on the processor architecture,
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* but also on the compiler and its optimization capabilities.
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* The value is not critical, some small value greater than zero
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* will be just fine if you don't care to squeeze every drop
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* of performance out of the code.
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* Small values favor memcpy, large values favor inline code.
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#if defined(__alpha__) || defined(__alpha)
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# define breakeven_point 2 /* AXP (DEC Alpha) - gcc or cc or egcs */
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#if defined(__i386__) || defined(__i386)
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# define breakeven_point 12 /* Intel Pentium/Linux - gcc 2.96 */
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# define breakeven_point 10 /* HP-PA - gcc */
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#if defined(__sparc__) || defined(__sparc)
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# define breakeven_point 33 /* Sun Sparc 5 - gcc 2.8.1 */
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/* some other values of possible interest: */
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/* #define breakeven_point 8 */ /* VAX 4000 - vaxc */
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/* #define breakeven_point 19 */ /* VAX 4000 - gcc 2.7.0 */
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#ifndef breakeven_point
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# define breakeven_point 6 /* some reasonable one-size-fits-all value */
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#define fast_memcpy(d,s,n) \
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{ register size_t nn = (size_t)(n); \
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if (nn >= breakeven_point) memcpy((d), (s), nn); \
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else if (nn > 0) { /* proc call overhead is worth only for large strings*/\
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register char *dd; register const char *ss; \
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for (ss=(s), dd=(d); nn>0; nn--) *dd++ = *ss++; } }
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#define fast_memset(d,c,n) \
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{ register size_t nn = (size_t)(n); \
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if (nn >= breakeven_point) memset((d), (int)(c), nn); \
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else if (nn > 0) { /* proc call overhead is worth only for large strings*/\
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register char *dd; register const int cc=(int)(c); \
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for (dd=(d); nn>0; nn--) *dd++ = cc; } }
379
#if defined(NEED_ASPRINTF)
380
int asprintf (char **ptr, const char *fmt, /*args*/ ...);
382
#if defined(NEED_VASPRINTF)
383
int vasprintf (char **ptr, const char *fmt, va_list ap);
385
#if defined(NEED_ASNPRINTF)
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int asnprintf (char **ptr, size_t str_m, const char *fmt, /*args*/ ...);
388
#if defined(NEED_VASNPRINTF)
389
int vasnprintf (char **ptr, size_t str_m, const char *fmt, va_list ap);
392
#if defined(HAVE_SNPRINTF)
393
/* declare our portable snprintf routine under name portable_snprintf */
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/* declare our portable vsnprintf routine under name portable_vsnprintf */
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/* 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
403
#if !defined(HAVE_SNPRINTF) || defined(PREFER_PORTABLE_SNPRINTF)
404
int portable_snprintf(char *str, size_t str_m, const char *fmt, /*args*/ ...);
405
#if !defined(NEED_SNPRINTF_ONLY)
406
int portable_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap);
412
static char credits[] = "\n\
413
@(#)snprintf.c, v2.2: Mark Martinec, <mark.martinec@ijs.si>\n\
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@(#)snprintf.c, v2.2: Copyright 1999, Mark Martinec. Frontier Artistic License applies.\n\
415
@(#)snprintf.c, v2.2: http://www.ijs.si/software/snprintf/\n";
417
#if defined(NEED_ASPRINTF)
418
int asprintf(char **ptr, const char *fmt, /*args*/ ...) {
424
va_start(ap, fmt); /* measure the required size */
425
str_l = portable_vsnprintf(NULL, (size_t)0, fmt, ap);
427
assert(str_l >= 0); /* possible integer overflow if str_m > INT_MAX */
428
*ptr = (char *) malloc(str_m = (size_t)str_l + 1);
429
if (*ptr == NULL) { errno = ENOMEM; str_l = -1; }
433
str_l2 = portable_vsnprintf(*ptr, str_m, fmt, ap);
435
assert(str_l2 == str_l);
441
#if defined(NEED_VASPRINTF)
442
int vasprintf(char **ptr, const char *fmt, va_list ap) {
448
va_copy(ap2, ap); /* don't consume the original ap, we'll need it again */
449
str_l = portable_vsnprintf(NULL, (size_t)0, fmt, ap2);/*get required size*/
452
assert(str_l >= 0); /* possible integer overflow if str_m > INT_MAX */
453
*ptr = (char *) malloc(str_m = (size_t)str_l + 1);
454
if (*ptr == NULL) { errno = ENOMEM; str_l = -1; }
456
int str_l2 = portable_vsnprintf(*ptr, str_m, fmt, ap);
457
assert(str_l2 == str_l);
463
#if defined(NEED_ASNPRINTF)
464
int asnprintf (char **ptr, size_t str_m, const char *fmt, /*args*/ ...) {
469
va_start(ap, fmt); /* measure the required size */
470
str_l = portable_vsnprintf(NULL, (size_t)0, fmt, ap);
472
assert(str_l >= 0); /* possible integer overflow if str_m > INT_MAX */
473
if ((size_t)str_l + 1 < str_m) str_m = (size_t)str_l + 1; /* truncate */
474
/* if str_m is 0, no buffer is allocated, just set *ptr to NULL */
475
if (str_m == 0) { /* not interested in resulting string, just return size */
477
*ptr = (char *) malloc(str_m);
478
if (*ptr == NULL) { errno = ENOMEM; str_l = -1; }
482
str_l2 = portable_vsnprintf(*ptr, str_m, fmt, ap);
484
assert(str_l2 == str_l);
491
#if defined(NEED_VASNPRINTF)
492
int vasnprintf (char **ptr, size_t str_m, const char *fmt, va_list ap) {
497
va_copy(ap2, ap); /* don't consume the original ap, we'll need it again */
498
str_l = portable_vsnprintf(NULL, (size_t)0, fmt, ap2);/*get required size*/
501
assert(str_l >= 0); /* possible integer overflow if str_m > INT_MAX */
502
if ((size_t)str_l + 1 < str_m) str_m = (size_t)str_l + 1; /* truncate */
503
/* if str_m is 0, no buffer is allocated, just set *ptr to NULL */
504
if (str_m == 0) { /* not interested in resulting string, just return size */
506
*ptr = (char *) malloc(str_m);
507
if (*ptr == NULL) { errno = ENOMEM; str_l = -1; }
509
int str_l2 = portable_vsnprintf(*ptr, str_m, fmt, ap);
510
assert(str_l2 == str_l);
518
* If the system does have snprintf and the portable routine is not
519
* specifically required, this module produces no code for snprintf/vsnprintf.
521
#if !defined(HAVE_SNPRINTF) || defined(PREFER_PORTABLE_SNPRINTF)
523
#if !defined(NEED_SNPRINTF_ONLY)
524
int portable_snprintf(char *str, size_t str_m, const char *fmt, /*args*/ ...) {
529
str_l = portable_vsnprintf(str, str_m, fmt, ap);
535
#if defined(NEED_SNPRINTF_ONLY)
536
int portable_snprintf(char *str, size_t str_m, const char *fmt, /*args*/ ...) {
538
int portable_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap) {
541
#if defined(NEED_SNPRINTF_ONLY)
547
/* In contrast with POSIX, the ISO C99 now says
548
* that str can be NULL and str_m can be 0.
549
* This is more useful than the old: if (str_m < 1) return -1; */
551
#if defined(NEED_SNPRINTF_ONLY)
557
/* if (str_l < str_m) str[str_l++] = *p++; -- this would be sufficient */
558
/* but the following code achieves better performance for cases
559
* where format string is long and contains few conversions */
560
const char *q = strchr(p+1,'%');
561
size_t n = !q ? strlen(p) : (q-p);
563
size_t avail = str_m-str_l;
564
fast_memcpy(str+str_l, p, (n>avail?avail:n));
568
#if defined(PERL_COMPATIBLE) || defined(LINUX_COMPATIBLE)
569
const char *starting_p;
571
size_t min_field_width = 0, precision = 0;
572
int zero_padding = 0, precision_specified = 0, justify_left = 0;
573
int alternate_form = 0, force_sign = 0;
574
int space_for_positive = 1; /* If both the ' ' and '+' flags appear,
575
the ' ' flag should be ignored. */
576
char length_modifier = '\0'; /* allowed values: \0, h, l, L */
577
char tmp[32];/* temporary buffer for simple numeric->string conversion */
579
const char *str_arg; /* string address in case of string argument */
580
size_t str_arg_l; /* natural field width of arg without padding
582
unsigned char uchar_arg;
583
/* unsigned char argument value - only defined for c conversion.
584
N.B. standard explicitly states the char argument for
585
the c conversion is unsigned */
587
size_t number_of_zeros_to_pad = 0;
588
/* number of zeros to be inserted for numeric conversions
589
as required by the precision or minimal field width */
591
size_t zero_padding_insertion_ind = 0;
592
/* index into tmp where zero padding is to be inserted */
594
char fmt_spec = '\0';
595
/* current conversion specifier character */
597
str_arg = credits;/* just to make compiler happy (defined but not used)*/
599
#if defined(PERL_COMPATIBLE) || defined(LINUX_COMPATIBLE)
600
starting_p = p; p++; /* skip '%' */
603
while (*p == '0' || *p == '-' || *p == '+' ||
604
*p == ' ' || *p == '#' || *p == '\'') {
606
case '0': zero_padding = 1; break;
607
case '-': justify_left = 1; break;
608
case '+': force_sign = 1; space_for_positive = 0; break;
609
case ' ': force_sign = 1;
610
/* If both the ' ' and '+' flags appear, the ' ' flag should be ignored */
611
#ifdef PERL_COMPATIBLE
612
/* ... but in Perl the last of ' ' and '+' applies */
613
space_for_positive = 1;
616
case '#': alternate_form = 1; break;
621
/* If the '0' and '-' flags both appear, the '0' flag should be ignored. */
623
/* parse field width */
626
p++; j = va_arg(ap, int);
627
if (j >= 0) min_field_width = j;
628
else { min_field_width = -j; justify_left = 1; }
629
} else if (isdigit((int)(*p))) {
630
/* size_t could be wider than unsigned int;
631
make sure we treat argument like common implementations do */
632
unsigned int uj = *p++ - '0';
633
while (isdigit((int)(*p))) uj = 10*uj + (unsigned int)(*p++ - '0');
634
min_field_width = uj;
636
/* parse precision */
638
p++; precision_specified = 1;
640
int j = va_arg(ap, int);
642
if (j >= 0) precision = j;
644
precision_specified = 0; precision = 0;
646
* Solaris 2.6 man page claims that in this case the precision
647
* should be set to 0. Digital Unix 4.0, HPUX 10 and BSD man page
648
* claim that this case should be treated as unspecified precision,
649
* which is what we do here.
652
} else if (isdigit((int)(*p))) {
653
/* size_t could be wider than unsigned int;
654
make sure we treat argument like common implementations do */
655
unsigned int uj = *p++ - '0';
656
while (isdigit((int)(*p))) uj = 10*uj + (unsigned int)(*p++ - '0');
660
/* parse 'h', 'l' and 'll' length modifiers */
661
if (*p == 'h' || *p == 'l') {
662
length_modifier = *p; p++;
663
if (length_modifier == 'l' && *p == 'l') { /* double l = long long */
664
#ifdef SNPRINTF_LONGLONG_SUPPORT
665
length_modifier = '2'; /* double l encoded as '2' */
667
length_modifier = 'l'; /* treat it as a single 'l' */
673
/* common synonyms: */
675
case 'i': fmt_spec = 'd'; break;
676
case 'D': fmt_spec = 'd'; length_modifier = 'l'; break;
677
case 'U': fmt_spec = 'u'; length_modifier = 'l'; break;
678
case 'O': fmt_spec = 'o'; length_modifier = 'l'; break;
681
/* get parameter value, do initial processing */
683
case '%': /* % behaves similar to 's' regarding flags and field widths */
684
case 'c': /* c behaves similar to 's' regarding flags and field widths */
686
length_modifier = '\0'; /* wint_t and wchar_t not supported */
687
/* the result of zero padding flag with non-numeric conversion specifier*/
688
/* is undefined. Solaris and HPUX 10 does zero padding in this case, */
689
/* Digital Unix and Linux does not. */
690
#if !defined(SOLARIS_COMPATIBLE) && !defined(HPUX_COMPATIBLE)
691
zero_padding = 0; /* turn zero padding off for string conversions */
698
int j = va_arg(ap, int);
699
uchar_arg = (unsigned char) j; /* standard demands unsigned char */
700
str_arg = (const char *) &uchar_arg;
704
str_arg = va_arg(ap, const char *);
705
if (!str_arg) str_arg_l = 0;
706
/* make sure not to address string beyond the specified precision !!! */
707
else if (!precision_specified) str_arg_l = strlen(str_arg);
708
/* truncate string if necessary as requested by precision */
709
else if (precision == 0) str_arg_l = 0;
711
/* memchr on HP does not like n > 2^31 !!! */
712
const char *q = memchr(str_arg, '\0',
713
precision <= 0x7fffffff ? precision : 0x7fffffff);
714
str_arg_l = !q ? precision : (q-str_arg);
720
case 'd': case 'u': case 'o': case 'x': case 'X': case 'p': {
721
/* NOTE: the u, o, x, X and p conversion specifiers imply
722
the value is unsigned; d implies a signed value */
725
/* 0 if numeric argument is zero (or if pointer is NULL for 'p'),
726
+1 if greater than zero (or nonzero for unsigned arguments),
727
-1 if negative (unsigned argument is never negative) */
729
int int_arg = 0; unsigned int uint_arg = 0;
730
/* only defined for length modifier h, or for no length modifiers */
732
long int long_arg = 0; unsigned long int ulong_arg = 0;
733
/* only defined for length modifier l */
735
void *ptr_arg = NULL;
736
/* pointer argument value -only defined for p conversion */
738
#ifdef SNPRINTF_LONGLONG_SUPPORT
739
long long int long_long_arg = 0;
740
unsigned long long int ulong_long_arg = 0;
741
/* only defined for length modifier ll */
743
if (fmt_spec == 'p') {
744
/* HPUX 10: An l, h, ll or L before any other conversion character
745
* (other than d, i, u, o, x, or X) is ignored.
747
* not specified, but seems to behave as HPUX does.
748
* Solaris: If an h, l, or L appears before any other conversion
749
* specifier (other than d, i, u, o, x, or X), the behavior
750
* is undefined. (Actually %hp converts only 16-bits of address
751
* and %llp treats address as 64-bit data which is incompatible
752
* with (void *) argument on a 32-bit system).
754
#ifdef SOLARIS_COMPATIBLE
755
# ifdef SOLARIS_BUG_COMPATIBLE
756
/* keep length modifiers even if it represents 'll' */
758
if (length_modifier == '2') length_modifier = '\0';
761
length_modifier = '\0';
763
ptr_arg = va_arg(ap, void *);
764
if (ptr_arg != NULL) arg_sign = 1;
765
} else if (fmt_spec == 'd') { /* signed */
766
switch (length_modifier) {
769
/* It is non-portable to specify a second argument of char or short
770
* to va_arg, because arguments seen by the called function
771
* are not char or short. C converts char and short arguments
772
* to int before passing them to a function.
774
int_arg = va_arg(ap, int);
775
if (int_arg > 0) arg_sign = 1;
776
else if (int_arg < 0) arg_sign = -1;
779
long_arg = va_arg(ap, long int);
780
if (long_arg > 0) arg_sign = 1;
781
else if (long_arg < 0) arg_sign = -1;
783
#ifdef SNPRINTF_LONGLONG_SUPPORT
785
long_long_arg = va_arg(ap, long long int);
786
if (long_long_arg > 0) arg_sign = 1;
787
else if (long_long_arg < 0) arg_sign = -1;
791
} else { /* unsigned */
792
switch (length_modifier) {
795
uint_arg = va_arg(ap, unsigned int);
796
if (uint_arg) arg_sign = 1;
799
ulong_arg = va_arg(ap, unsigned long int);
800
if (ulong_arg) arg_sign = 1;
802
#ifdef SNPRINTF_LONGLONG_SUPPORT
804
ulong_long_arg = va_arg(ap, unsigned long long int);
805
if (ulong_long_arg) arg_sign = 1;
810
str_arg = tmp; str_arg_l = 0;
812
* For d, i, u, o, x, and X conversions, if precision is specified,
813
* the '0' flag should be ignored. This is so with Solaris 2.6,
814
* Digital UNIX 4.0, HPUX 10, Linux, FreeBSD, NetBSD; but not with Perl.
816
#ifndef PERL_COMPATIBLE
817
if (precision_specified) zero_padding = 0;
819
if (fmt_spec == 'd') {
820
if (force_sign && arg_sign >= 0)
821
tmp[str_arg_l++] = space_for_positive ? ' ' : '+';
822
/* leave negative numbers for sprintf to handle,
823
to avoid handling tricky cases like (short int)(-32768) */
824
#ifdef LINUX_COMPATIBLE
825
} else if (fmt_spec == 'p' && force_sign && arg_sign > 0) {
826
tmp[str_arg_l++] = space_for_positive ? ' ' : '+';
828
} else if (alternate_form) {
829
if (arg_sign != 0 && (fmt_spec == 'x' || fmt_spec == 'X') )
830
{ tmp[str_arg_l++] = '0'; tmp[str_arg_l++] = fmt_spec; }
831
/* alternate form should have no effect for p conversion, but ... */
832
#ifdef HPUX_COMPATIBLE
833
else if (fmt_spec == 'p'
834
/* HPUX 10: for an alternate form of p conversion,
835
* a nonzero result is prefixed by 0x. */
836
#ifndef HPUX_BUG_COMPATIBLE
837
/* Actually it uses 0x prefix even for a zero value. */
840
) { tmp[str_arg_l++] = '0'; tmp[str_arg_l++] = 'x'; }
843
zero_padding_insertion_ind = str_arg_l;
844
if (!precision_specified) precision = 1; /* default precision is 1 */
845
if (precision == 0 && arg_sign == 0
846
#if defined(HPUX_BUG_COMPATIBLE) || defined(LINUX_COMPATIBLE)
848
/* HPUX 10 man page claims: With conversion character p the result of
849
* converting a zero value with a precision of zero is a null string.
850
* Actually HP returns all zeroes, and Linux returns "(nil)". */
853
/* converted to null string */
854
/* When zero value is formatted with an explicit precision 0,
855
the resulting formatted string is empty (d, i, u, o, x, X, p). */
857
char f[5]; int f_l = 0;
858
f[f_l++] = '%'; /* construct a simple format string for sprintf */
859
if (!length_modifier) { }
860
else if (length_modifier=='2') { f[f_l++] = 'l'; f[f_l++] = 'l'; }
861
else f[f_l++] = length_modifier;
862
f[f_l++] = fmt_spec; f[f_l++] = '\0';
863
if (fmt_spec == 'p') str_arg_l += sprintf(tmp+str_arg_l, f, ptr_arg);
864
else if (fmt_spec == 'd') { /* signed */
865
switch (length_modifier) {
867
case 'h': str_arg_l+=sprintf(tmp+str_arg_l, f, int_arg); break;
868
case 'l': str_arg_l+=sprintf(tmp+str_arg_l, f, long_arg); break;
869
#ifdef SNPRINTF_LONGLONG_SUPPORT
870
case '2': str_arg_l+=sprintf(tmp+str_arg_l,f,long_long_arg); break;
873
} else { /* unsigned */
874
switch (length_modifier) {
876
case 'h': str_arg_l+=sprintf(tmp+str_arg_l, f, uint_arg); break;
877
case 'l': str_arg_l+=sprintf(tmp+str_arg_l, f, ulong_arg); break;
878
#ifdef SNPRINTF_LONGLONG_SUPPORT
879
case '2': str_arg_l+=sprintf(tmp+str_arg_l,f,ulong_long_arg);break;
883
/* include the optional minus sign and possible "0x"
884
in the region before the zero padding insertion point */
885
if (zero_padding_insertion_ind < str_arg_l &&
886
tmp[zero_padding_insertion_ind] == '-') {
887
zero_padding_insertion_ind++;
889
if (zero_padding_insertion_ind+1 < str_arg_l &&
890
tmp[zero_padding_insertion_ind] == '0' &&
891
(tmp[zero_padding_insertion_ind+1] == 'x' ||
892
tmp[zero_padding_insertion_ind+1] == 'X') ) {
893
zero_padding_insertion_ind += 2;
896
{ size_t num_of_digits = str_arg_l - zero_padding_insertion_ind;
897
if (alternate_form && fmt_spec == 'o'
898
#ifdef HPUX_COMPATIBLE /* ("%#.o",0) -> "" */
901
#ifdef DIGITAL_UNIX_BUG_COMPATIBLE /* ("%#o",0) -> "00" */
903
/* unless zero is already the first character */
904
&& !(zero_padding_insertion_ind < str_arg_l
905
&& tmp[zero_padding_insertion_ind] == '0')
907
) { /* assure leading zero for alternate-form octal numbers */
908
if (!precision_specified || precision < num_of_digits+1) {
909
/* precision is increased to force the first character to be zero,
910
except if a zero value is formatted with an explicit precision
912
precision = num_of_digits+1; precision_specified = 1;
915
/* zero padding to specified precision? */
916
if (num_of_digits < precision)
917
number_of_zeros_to_pad = precision - num_of_digits;
919
/* zero padding to specified minimal field width? */
920
if (!justify_left && zero_padding) {
921
int n = min_field_width - (str_arg_l+number_of_zeros_to_pad);
922
if (n > 0) number_of_zeros_to_pad += n;
926
default: /* unrecognized conversion specifier, keep format string as-is*/
927
zero_padding = 0; /* turn zero padding off for non-numeric convers. */
928
#ifndef DIGITAL_UNIX_COMPATIBLE
929
justify_left = 1; min_field_width = 0; /* reset flags */
931
#if defined(PERL_COMPATIBLE) || defined(LINUX_COMPATIBLE)
932
/* keep the entire format string unchanged */
933
str_arg = starting_p; str_arg_l = p - starting_p;
934
/* well, not exactly so for Linux, which does something inbetween,
935
* and I don't feel an urge to imitate it: "%+++++hy" -> "%+y" */
937
/* discard the unrecognized conversion, just keep *
938
* the unrecognized conversion character */
939
str_arg = p; str_arg_l = 0;
941
if (*p) str_arg_l++; /* include invalid conversion specifier unchanged
942
if not at end-of-string */
945
if (*p) p++; /* step over the just processed conversion specifier */
946
/* insert padding to the left as requested by min_field_width;
947
this does not include the zero padding in case of numerical conversions*/
948
if (!justify_left) { /* left padding with blank or zero */
949
int n = min_field_width - (str_arg_l+number_of_zeros_to_pad);
952
size_t avail = str_m-str_l;
953
fast_memset(str+str_l, (zero_padding?'0':' '), (n>avail?avail:n));
958
/* zero padding as requested by the precision or by the minimal field width
959
* for numeric conversions required? */
960
if (number_of_zeros_to_pad <= 0) {
961
/* will not copy first part of numeric right now, *
962
* force it to be copied later in its entirety */
963
zero_padding_insertion_ind = 0;
965
/* insert first part of numerics (sign or '0x') before zero padding */
966
int n = zero_padding_insertion_ind;
969
size_t avail = str_m-str_l;
970
fast_memcpy(str+str_l, str_arg, (n>avail?avail:n));
974
/* insert zero padding as requested by the precision or min field width */
975
n = number_of_zeros_to_pad;
978
size_t avail = str_m-str_l;
979
fast_memset(str+str_l, '0', (n>avail?avail:n));
984
/* insert formatted string
985
* (or as-is conversion specifier for unknown conversions) */
986
{ int n = str_arg_l - zero_padding_insertion_ind;
989
size_t avail = str_m-str_l;
990
fast_memcpy(str+str_l, str_arg+zero_padding_insertion_ind,
996
/* insert right padding */
997
if (justify_left) { /* right blank padding to the field width */
998
int n = min_field_width - (str_arg_l+number_of_zeros_to_pad);
1000
if (str_l < str_m) {
1001
size_t avail = str_m-str_l;
1002
fast_memset(str+str_l, ' ', (n>avail?avail:n));
1009
#if defined(NEED_SNPRINTF_ONLY)
1012
if (str_m > 0) { /* make sure the string is null-terminated
1013
even at the expense of overwriting the last character
1014
(shouldn't happen, but just in case) */
1015
str[str_l <= str_m-1 ? str_l : str_m-1] = '\0';
1017
/* Return the number of characters formatted (excluding trailing null
1018
* character), that is, the number of characters that would have been
1019
* written to the buffer if it were large enough.
1021
* The value of str_l should be returned, but str_l is of unsigned type
1022
* size_t, and snprintf is int, possibly leading to an undetected
1023
* integer overflow, resulting in a negative return value, which is illegal.
1024
* Both XSH5 and ISO C99 (at least the draft) are silent on this issue.
1025
* Should errno be set to EOVERFLOW and EOF returned in this case???
added
removed
source/3rdparty/snprintf/snprintf.c
