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/*
* snprintf.c - a portable implementation of snprintf
*
* AUTHOR
* Mark Martinec <mark.martinec@ijs.si>, April 1999.
*
* Copyright 1999, Mark Martinec. All rights reserved.
*
* TERMS AND CONDITIONS
* This program is free software; you can redistribute it and/or modify
* it under the terms of the "Frontier Artistic License" which comes
* with this Kit.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the Frontier Artistic License for more details.
*
* You should have received a copy of the Frontier Artistic License
* with this Kit in the file named LICENSE.txt .
* If not, I'll be glad to provide one.
*
* FEATURES
* - careful adherence to specs regarding flags, field width and precision;
* - good performance for large string handling (large format, large
* argument or large paddings). Performance is similar to system's sprintf
* and in several cases significantly better (make sure you compile with
* optimizations turned on, tell the compiler the code is strict ANSI
* if necessary to give it more freedom for optimizations);
* - return value semantics as per ISO C9X;
* - written in standard ISO/ANSI C - requires an ANSI C compiler.
*
* SUPPORTED FORMATS AND DATA TYPES
*
* This snprintf only supports format specifiers:
* s, c, d, o, u, x, X, p (and synonyms: i, D, U, O - see below)
* with flags: '-', '+', ' ', '0' and '#'.
* An asterisk is supported for field width as well as precision.
*
* Data type modifiers 'h' (short int), 'l' (long int)
* and 'll' (long long int) are supported.
* NOTE:
* If macro SNPRINTF_LONGLONG_SUPPORT is not defined (default) the
* data type modifier 'll' is recognized but treated the same as 'l',
* which may cause argument value truncation! Defining
* SNPRINTF_LONGLONG_SUPPORT requires that your system's sprintf also
* handles data type modifier 'll'. long long int is a language
* extension which may not be portable.
*
* Conversion of numeric data (formats d, o, u, x, X, p) with data type
* modifiers (none or h, l, ll) is left to the system routine sprintf,
* but all handling of flags, field width and precision as well as c and
* s formats is done very carefully by this portable routine. If a string
* precision (truncation) is specified (e.g. %.8s) it is guaranteed the
* string beyond the specified precision will not be referenced.
*
* Data type modifiers h, l and ll are ignored for c and s formats (data
* types wint_t and wchar_t are not supported).
*
* The following common synonyms for conversion characters are supported:
* - i is a synonym for d
* - D is a synonym for ld, explicit data type modifiers are ignored
* - U is a synonym for lu, explicit data type modifiers are ignored
* - O is a synonym for lo, explicit data type modifiers are ignored
*
* The following is specifically not supported:
* - flag ' (thousands' grouping character) is recognized but ignored
* - numeric formats: f, e, E, g, G and synonym F
* - data type modifier 'L' (long double) and 'q' (quad - use 'll' instead)
* - wide character/string formats: C, lc, S, ls
* - writeback of converted string length: conversion character n
* - the n$ specification for direct reference to n-th argument
* - locales
*
* It is permitted for str_m to be zero, and it is permitted to specify NULL
* pointer for resulting string argument if str_m is zero (as per ISO C9X).
*
* The return value is the number of characters which would be generated
* for the given input, excluding the trailing null. If this value
* is greater or equal to str_m, not all characters from the result
* have been stored in str. If str_m is greater than zero it is
* guaranteed the resulting string will be null-terminated.
*
* NOTE that this matches the ISO C9X and GNU C library 2.1,
* but is different from some older implementations!
*
* Routines asprintf and vasprintf return a pointer (in the ptr argument)
* to a buffer sufficiently large to hold the resulting string. This pointer
* should be passed to free(3) to release the allocated storage when it is
* no longer needed. If sufficient space cannot be allocated, these functions
* will return -1 and set ptr to be a NULL pointer. These two routines are a
* GNU C library extensions (glibc).
*
* Routines asnprintf and vasnprintf are similar to asprintf and vasprintf,
* yet, like snprintf and vsnprintf counterparts, will write at most str_m-1
* characters into the allocated output string, the last character in the
* allocated buffer then gets the terminating null. If the formatted string
* length (the return value) is greater than or equal to the str_m argument,
* the resulting string was truncated and some of the formatted characters
* were discarded. These routines present a handy way to limit the amount
* of allocated memory to some sane value.
*
* AVAILABILITY
* http://www.ijs.si/software/snprintf/
*
* REVISION HISTORY
* 1999-04 V0.9 Mark Martinec
* - initial version, some modifications after comparing printf
* man pages for Digital Unix 4.0, Solaris 2.6 and HPUX 10,
* and checking how Perl handles sprintf (differently!);
* 1999-04-09 V1.0 Mark Martinec <mark.martinec@ijs.si>
* - added main test program, fixed remaining inconsistencies,
* added optional (long long int) support;
* 1999-04-12 V1.1 Mark Martinec <mark.martinec@ijs.si>
* - support the 'p' format (pointer to void);
* - if a string precision is specified
* make sure the string beyond the specified precision
* will not be referenced (e.g. by strlen);
* 1999-04-13 V1.2 Mark Martinec <mark.martinec@ijs.si>
* - support synonyms %D=%ld, %U=%lu, %O=%lo;
* - speed up the case of long format string with few conversions;
* 1999-06-30 V1.3 Mark Martinec <mark.martinec@ijs.si>
* - fixed runaway loop (eventually crashing when str_l wraps
* beyond 2*31) while copying format string without
* conversion specifiers to a buffer that is too short
* (thanks to Edwin Young <edwiny@autonomy.com> for
* spotting the problem);
* - added macros PORTABLE_SNPRINTF_VERSION_(MAJOR|MINOR)
* to snprintf.h
* 2000-02-14 V2.0 (never released) Mark Martinec <mark.martinec@ijs.si>
* - relaxed license terms: The Artistic License now applies.
* You may still apply the GNU GENERAL PUBLIC LICENSE
* as was distributed with previous versions, if you prefer;
* - changed REVISION HISTORY dates to use ISO 8601 date format;
* - added vsnprintf (patch also independently proposed by
* Caolan McNamara 2000-05-04, and Keith M Willenson 2000-06-01)
* 2000-06-27 V2.1 Mark Martinec <mark.martinec@ijs.si>
* - removed POSIX check for str_m<1; value 0 for str_m is
* allowed by ISO C9X (and GNU C library 2.1) - (pointed out
* on 2000-05-04 by Caolan McNamara, caolan@ csn dot ul dot ie).
* Besides relaxed license this change in standards adherence
* is the main reason to bump up the major version number;
* - added nonstandard routines asnprintf, vasnprintf, asprintf,
* vasprintf that dynamically allocate storage for the
* resulting string; these routines are not compiled by default,
* see comments where NEED_V?ASN?PRINTF macros are defined;
* - autoconf contributed by Caolan McNamara
*/
/* Define HAVE_SNPRINTF if your system already has snprintf and vsnprintf.
*
* If HAVE_SNPRINTF is defined this module will not produce code for
* snprintf and vsnprintf, unless PREFER_PORTABLE_SNPRINTF is defined as well,
* causing this portable version of snprintf to be called fl_portable_snprintf
* (and fl_portable_vsnprintf).
*/
/* #define HAVE_SNPRINTF */
/* Define PREFER_PORTABLE_SNPRINTF if your system does have snprintf and
* vsnprintf but you would prefer to use the portable routine(s) instead.
* In this case the portable routine is declared as fl_portable_snprintf
* (and fl_portable_vsnprintf) and a macro 'snprintf' (and 'vsnprintf')
* is defined to expand to 'portable_v?snprintf' - see file snprintf.h .
* Defining this macro is only useful if HAVE_SNPRINTF is also defined,
* but does does no harm if defined nevertheless.
*/
/* #define PREFER_PORTABLE_SNPRINTF */
/* Define SNPRINTF_LONGLONG_SUPPORT if you want to support
* data type (long long int) and data type modifier 'll' (e.g. %lld).
* If undefined, 'll' is recognized but treated as a single 'l'.
*
* If the system's sprintf does not handle 'll'
* the SNPRINTF_LONGLONG_SUPPORT must not be defined!
*
* This is off by default since (long long int) is a language extension.
*/
/* #define SNPRINTF_LONGLONG_SUPPORT */
/* Define NEED_SNPRINTF_ONLY if you only need snprintf, and not vsnprintf.
* If NEED_SNPRINTF_ONLY is defined, the snprintf will be defined directly,
* otherwise both snprintf and vsnprintf routines will be defined
* and snprintf will be a simple wrapper around vsnprintf, at the expense
* of an extra procedure call.
*/
/* #define NEED_SNPRINTF_ONLY */
/* Define NEED_V?ASN?PRINTF macros if you need library extension
* routines asprintf, vasprintf, asnprintf, vasnprintf respectively,
* and your system library does not provide them. They are all small
* wrapper routines around fl_portable_vsnprintf. Defining any of the four
* NEED_V?ASN?PRINTF macros automatically turns off NEED_SNPRINTF_ONLY
* and turns on PREFER_PORTABLE_SNPRINTF.
*
* Watch for name conflicts with the system library if these routines
* are already present there.
*
* NOTE: vasprintf and vasnprintf routines need va_copy() from stdarg.h, as
* specified by C9X, to be able to traverse the same list of arguments twice.
* I don't know of any other standard and portable way of achieving the same.
* With some versions of gcc you may use __va_copy(). You might even get away
* with "ap2 = ap", in this case you must not call va_end(ap2) !
*/
/* #define NEED_ASPRINTF */
/* #define NEED_ASNPRINTF */
/* #define NEED_VASPRINTF */
/* #define NEED_VASNPRINTF */
/* Define the following macros if desired:
* SOLARIS_COMPATIBLE, SOLARIS_BUG_COMPATIBLE,
* HPUX_COMPATIBLE, HPUX_BUG_COMPATIBLE,
* DIGITAL_UNIX_COMPATIBLE, DIGITAL_UNIX_BUG_COMPATIBLE,
* PERL_COMPATIBLE, PERL_BUG_COMPATIBLE,
*
* - For portable applications it is best not to rely on peculiarities
* of a given implementation so it may be best not to define any
* of the macros that select compatibility and to avoid features
* that vary among the systems.
*
* - Selecting compatibility with more than one operating system
* is not strictly forbidden but is not recommended.
*
* - 'x'_BUG_COMPATIBLE implies 'x'_COMPATIBLE .
*
* - 'x'_COMPATIBLE refers to (and enables) a behaviour that is
* documented in a sprintf man page on a given operating system
* and actually adhered to by the system's sprintf (but not on
* most other operating systems). It may also refer to and enable
* a behaviour that is declared 'undefined' or 'implementation specific'
* in the man page but a given implementation behaves predictably
* in a certain way.
*
* - 'x'_BUG_COMPATIBLE refers to (and enables) a behaviour of system's sprintf
* that contradicts the sprintf man page on the same operating system.
*
* - I do not claim that the 'x'_COMPATIBLE and 'x'_BUG_COMPATIBLE
* conditionals take into account all idiosyncrasies of a particular
* implementation, there may be other incompatibilities.
*/
/* added by Lgb, the LyX Project */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
/* ============================================= */
/* NO USER SERVICABLE PARTS FOLLOWING THIS POINT */
/* ============================================= */
#define PORTABLE_SNPRINTF_VERSION_MAJOR 2
#define PORTABLE_SNPRINTF_VERSION_MINOR 1
#if defined ( NEED_ASPRINTF ) || defined ( NEED_ASNPRINTF ) || defined ( NEED_VASPRINTF ) || defined ( NEED_VASNPRINTF )
# if defined ( NEED_SNPRINTF_ONLY )
# undef NEED_SNPRINTF_ONLY
# endif
# if ! defined ( PREFER_PORTABLE_SNPRINTF )
# define PREFER_PORTABLE_SNPRINTF
# endif
#endif
#if defined ( SOLARIS_BUG_COMPATIBLE ) && ! defined ( SOLARIS_COMPATIBLE )
#define SOLARIS_COMPATIBLE
#endif
#if defined ( HPUX_BUG_COMPATIBLE ) && ! defined ( HPUX_COMPATIBLE )
#define HPUX_COMPATIBLE
#endif
#if defined ( DIGITAL_UNIX_BUG_COMPATIBLE ) && ! defined( DIGITAL_UNIX_COMPATIBLE )
#define DIGITAL_UNIX_COMPATIBLE
#endif
#if defined ( PERL_BUG_COMPATIBLE ) && ! defined ( PERL_COMPATIBLE )
#define PERL_COMPATIBLE
#endif
#include <sys/types.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <assert.h>
#include <errno.h>
#ifdef isdigit
#undef isdigit
#endif
#define isdigit( c ) ( ( c ) >= '0' && ( c ) <= '9' )
/* prototypes */
#if defined ( NEED_ASPRINTF )
int asprintf( char **,
const char *,
... );
#endif
#if defined ( NEED_VASPRINTF )
int vasprintf( char **,
const char *,
va_list );
#endif
#if defined ( NEED_ASNPRINTF )
int asnprintf( char **,
size_t,
const char *,
... );
#endif
#if defined ( NEED_VASNPRINTF )
int vasnprintf( char **,
size_t,
const char *,
va_list );
#endif
#ifndef va_copy
#define va_copy( ap2, ap ) ap2 = ap
#endif
#if 0
#if defined ( HAVE_SNPRINTF )
/* declare our portable snprintf routine under name fl_portable_snprintf */
/* declare our portable vsnprintf routine under name fl_portable_vsnprintf */
#else
/* declare our portable routines under names snprintf and vsnprintf */
#define fl_portable_snprintf snprintf
#if !defined ( NEED_SNPRINTF_ONLY )
#define fl_portable_vsnprintf vsnprintf
#endif
#endif
#endif /* 0 */
#if ! defined ( HAVE_SNPRINTF ) || defined ( PREFER_PORTABLE_SNPRINTF )
int fl_portable_snprintf( char *,
size_t,
const char *,
... );
#if ! defined ( NEED_SNPRINTF_ONLY )
int fl_portable_vsnprintf( char *,
size_t,
const char *,
va_list );
#endif
#endif
/***************************************
***************************************/
#if defined ( NEED_ASPRINTF )
int asprintf( char **ptr,
const char *fmt,
... )
{
va_list ap;
size_t str_m;
int str_l;
*ptr = NULL;
va_start( ap, fmt ); /* measure the required size */
str_l = fl_portable_vsnprintf( NULL, ( size_t ) 0, fmt, ap );
va_end( ap );
assert( str_l >= 0 ); /* possible integer overflow if str_m > INT_MAX */
*ptr = fl_malloc( str_m = str_l + 1 );
if ( *ptr == NULL )
{
errno = ENOMEM;
str_l = -1;
}
else
{
int str_l2;
va_start( ap, fmt );
str_l2 = fl_portable_vsnprintf( *ptr, str_m, fmt, ap );
va_end( ap );
assert( str_l2 == str_l );
}
return str_l;
}
#endif
/***************************************
***************************************/
#if defined ( NEED_VASPRINTF )
int
vasprintf( char ** ptr,
const char * fmt,
va_list ap )
{
size_t str_m;
int str_l;
*ptr = NULL;
{
va_list ap2;
va_copy( ap2, ap ); /* don't consume the original ap, we'll need
it again */
/* measure the required size: */
str_l = fl_portable_vsnprintf( NULL, ( size_t ) 0, fmt, ap2 );
va_end( ap2 );
}
assert( str_l >= 0 ); /* possible integer overflow if str_m > INT_MAX */
*ptr = fl_malloc( str_m = str_l + 1 );
if ( *ptr == NULL )
{
errno = ENOMEM;
str_l = -1;
}
else
{
int str_l2 = fl_portable_vsnprintf( *ptr, str_m, fmt, ap );
assert( str_l2 == str_l );
}
return str_l;
}
#endif
/***************************************
***************************************/
#if defined ( NEED_ASNPRINTF )
int
asnprintf( char ** ptr,
size_t str_m,
const char * fmt,
... )
{
va_list ap;
int str_l;
*ptr = NULL;
va_start( ap, fmt ); /* measure the required size */
str_l = fl_portable_vsnprintf( NULL, ( size_t ) 0, fmt, ap );
va_end( ap );
assert( str_l >= 0 ); /* possible integer overflow if str_m > INT_MAX */
if ( ( size_t ) str_l + 1 < str_m )
str_m = ( size_t ) str_l + 1; /* truncate */
/* if str_m is 0, no buffer is allocated, just set *ptr to NULL */
if ( str_m == 0 )
{
/* not interested in resulting string, just return size */
}
else
{
*ptr = fl_malloc( str_m );
if ( *ptr == NULL )
{
errno = ENOMEM;
str_l = -1;
}
else
{
int str_l2;
va_start( ap, fmt );
str_l2 = fl_portable_vsnprintf( *ptr, str_m, fmt, ap );
va_end( ap );
assert( str_l2 == str_l );
}
}
return str_l;
}
#endif
/***************************************
***************************************/
#if defined ( NEED_VASNPRINTF )
int
vasnprintf ( char ** ptr,
size_t str_m,
const char * fmt,
va_list ap )
{
int str_l;
*ptr = NULL;
{
va_list ap2;
va_copy( ap2, ap ); /* don't consume the original ap, we'll need
it again */
/* measure the required size: */
str_l = fl_portable_vsnprintf( NULL, ( size_t ) 0, fmt, ap2 );
va_end( ap2 );
}
assert( str_l >= 0 ); /* possible integer overflow if str_m > INT_MAX */
if ( ( size_t ) str_l + 1 < str_m )
str_m = ( size_t )str_l + 1; /* truncate */
/* if str_m is 0, no buffer is allocated, just set *ptr to NULL */
if ( str_m == 0 )
{
/* not interested in resulting string, just return size */
}
else
{
*ptr = fl_malloc( str_m );
if ( *ptr == NULL )
{
errno = ENOMEM;
str_l = -1;
}
else
{
int str_l2 = fl_portable_vsnprintf( *ptr, str_m, fmt, ap );
assert( str_l2 == str_l );
}
}
return str_l;
}
#endif
/***************************************
***************************************/
/*
* If the system does have snprintf and the portable routine is not
* specifically required, this module produces no code for snprintf/vsnprintf.
*/
#if ! defined ( HAVE_SNPRINTF ) || defined ( PREFER_PORTABLE_SNPRINTF )
#if ! defined ( NEED_SNPRINTF_ONLY )
int
fl_portable_snprintf( char * str,
size_t str_m,
const char * fmt,
... )
{
va_list ap;
int str_l;
va_start( ap, fmt );
str_l = fl_portable_vsnprintf( str, str_m, fmt, ap );
va_end( ap );
return str_l;
}
#endif
/***************************************
***************************************/
#if defined ( NEED_SNPRINTF_ONLY )
int
fl_portable_snprintf( char * str,
size_t str_m,
const char * fmt,
... )
{
#else
int
fl_portable_vsnprintf( char * str,
size_t str_m,
const char * fmt,
va_list ap )
{
#endif
#if defined ( NEED_SNPRINTF_ONLY )
va_list ap;
#endif
size_t str_l = 0;
const char *p = fmt;
/* In contrast with POSIX, the ISO C9X now says
* that str can be NULL and str_m can be 0. This is more useful. */
/*if (str_m < 1) return -1;*/
#if defined ( NEED_SNPRINTF_ONLY )
va_start( ap, fmt );
#endif
if ( ! p )
p = "";
while ( *p )
{
if ( *p != '%' )
{
/* if (str_l < str_m) str[str_l++] = *p++; -- this would be
sufficient but the following code achieves better performance
for cases where format string is long and contains few
conversions */
const char *q = strchr( p + 1, '%' );
int n = ! q ? strlen( p ) : ( q - p );
int avail = ( int ) ( str_m - str_l );
if ( avail > 0 )
{
int k;
char *r;
const char* p1;
for ( p1 = p, r = str + str_l, k = ( n > avail ? avail : n );
k > 0 ; k-- )
*r++ = *p1++;
}
p += n;
str_l += n;
}
else
{
const char *starting_p;
int min_field_width = 0,
precision = 0;
int zero_padding = 0,
precision_specified = 0,
justify_left = 0;
int alternative_form = 0,
force_sign = 0;
int space_for_positive = 1; /* If both the ' ' and '+' flags
appear, the ' ' flag should be
ignored. */
char data_type_modifier = '\0';/* allowed valued: \0, h, l, L, p */
char tmp[ 32 ]; /* temporary buffer for simple
numeric->string conversion */
const char *str_arg = NULL; /* string address in case of
string arguments */
int str_arg_l; /* natural field width of arg
without padding and sign */
long int long_arg; /* long int argument value - always defined
in case of numeric arguments, regardless
of data type modifiers. In case of data
type modifier 'll' the value is stored in
long_long_arg and only the sign of long_arg
is guaranteed to be correct */
void *ptr_arg; /* pointer argument value - only defined for
p format */
int int_arg; /* int argument value - only defined if no
h or l modif.*/
#ifdef SNPRINTF_LONGLONG_SUPPORT
long long int long_long_arg = 0; /* long long argument value - only
defined if ll modifier is
present */
#endif
int number_of_zeros_to_pad = 0;
int zero_padding_insertion_ind = 0;
char fmt_spec = '\0'; /* current format specifier
character */
starting_p = p;
p++; /* skip '%' */
/* parse flags */
while ( *p == '0' || *p == '-' || *p == '+'
|| *p == ' ' || *p == '#' || *p == '\'') {
switch ( *p )
{
case '0':
zero_padding = 1;
break;
case '-':
justify_left = 1;
break;
case '+':
force_sign = 1;
space_for_positive = 0;
break;
case ' ':
force_sign = 1;
/* If both the ' ' and '+' flags appear, the ' ' flag
should be ignored */
#ifdef PERL_COMPATIBLE
/* ... but in Perl the last of ' ' and '+' applies */
space_for_positive = 1;
#endif
break;
case '#':
alternative_form = 1;
break;
case '\'':
break;
}
p++;
}
/* If the '0' and '-' flags both appear, the '0' flag should
be ignored. */
/* parse field width */
if ( *p == '*' )
{
p++;
min_field_width = va_arg( ap, int );
if ( min_field_width < 0 )
{
min_field_width = -min_field_width;
justify_left = 1;
}
}
else if ( isdigit( ( int ) *p ) )
{
min_field_width = *p++ - '0';
while (isdigit( ( int ) *p ) )
min_field_width = 10 * min_field_width + ( *p++ - '0' );
}
/* parse precision */
if ( *p == '.' )
{
p++;
precision_specified = 1;
if ( *p == '*' )
{
p++;
precision = va_arg( ap, int );
if ( precision < 0 )
{
precision_specified = 0;
precision = 0;
/* NOTE: Solaris 2.6 man page claims that in this
* case the precision should be set to 0. Digital
* Unix 4.0 and HPUX 10 man page claim that this
* case should be treated as unspecified precision,
* which is what we do here.
*/
}
} else if ( isdigit( ( int ) *p ) )
{
precision = *p++ - '0';
while ( isdigit( ( int ) *p ) )
precision = 10 * precision + ( *p++ - '0' );
}
}
/* parse 'h', 'l' and 'll' data type modifiers */
if ( *p == 'h' || *p == 'l' )
{
data_type_modifier = *p;
p++;
if ( data_type_modifier == 'l' && *p == 'l' )
{
/* double l = long long */
#ifdef SNPRINTF_LONGLONG_SUPPORT
data_type_modifier = '2'; /* double l encoded as '2' */
#else
data_type_modifier = 'l'; /* treat it as single 'l' */
#endif
p++;
}
}
fmt_spec = *p;
/* common synonyms: */
switch ( fmt_spec )
{
case 'i':
fmt_spec = 'd';
break;
case 'D':
fmt_spec = 'd';
data_type_modifier = 'l';
break;
case 'U':
fmt_spec = 'u';
data_type_modifier = 'l';
break;
case 'O':
fmt_spec = 'o';
data_type_modifier = 'l';
break;
default:
break;
}
/* get parameter value, do initial processing */
switch ( fmt_spec )
{
case '%':
/* % behaves similar to 's' regarding flags and field
widths */
case 'c':
/* c behaves similar to 's' regarding flags and field
widths */
case 's':
data_type_modifier = '\0';
/* wint_t and wchar_t not supported */
/* the result of zero padding flag with non-numeric
format is undefined */
/* Solaris and HPUX 10 does zero padding in this case,
Digital Unix not */
#ifdef DIGITAL_UNIX_COMPATIBLE
zero_padding = 0; /* turn zero padding off for
string formats */
#endif
str_arg_l = 1;
switch ( fmt_spec )
{
case '%':
str_arg = p;
break;
case 'c':
{
int j = va_arg( ap, int );
str_arg = ( const char * ) &j;
}
break;
case 's':
str_arg = va_arg( ap, const char * );
if ( ! str_arg )
str_arg_l = 0;
/* make sure not to address string beyond the
specified precision !!! */
else if ( ! precision_specified )
str_arg_l = strlen( str_arg );
/* truncate string if necessary as requested by
precision */
else if ( precision <= 0 )
str_arg_l = 0;
else
{
const char *q = memchr( str_arg, '\0',
( size_t ) precision );
str_arg_l = ! q ? precision : ( q - str_arg );
}
break;
default:
break;
}
break;
case 'd':
case 'o':
case 'u':
case 'x':
case 'X':
case 'p':
long_arg = 0;
int_arg = 0;
ptr_arg = NULL;
if ( fmt_spec == 'p' )
{
/* * HPUX 10:
An l, h, ll or L before any other conversion
character (other than d, i, o, u, x, or X) is
ignored.
* Digital Unix:
not specified, but seems to behave as HPUX does.
* Solaris:
If an h, l, or L appears before any other
conversion specifier (other than d, i, o, u, x,
or X), the behavior is undefined. (Actually %hp
converts only 16-bits of address and %llp treats
address as 64-bit data which is incompatible
with (void *) argument on a 32-bit system). */
#ifdef SOLARIS_COMPATIBLE
# ifdef SOLARIS_BUG_COMPATIBLE
/* keep data type modifiers even if it
represents 'll' */
# else
if ( data_type_modifier == '2' )
data_type_modifier = '\0';
# endif
#else
data_type_modifier = '\0';
#endif
ptr_arg = va_arg( ap, void * );
long_arg = ! ptr_arg ? 0 : 1;
} else {
switch ( data_type_modifier )
{
case '\0':
case 'h':
/* It is non-portable to specify a second
argument of char or short to va_arg,
because arguments seen by the called
function are not char or short. C converts
char and short arguments to int before
passing them to a function. */
int_arg = va_arg( ap, int );
long_arg = int_arg;
break;
case 'l':
long_arg = va_arg( ap, long int );
break;
#ifdef SNPRINTF_LONGLONG_SUPPORT
case '2':
long_long_arg = va_arg( ap, long long int );
/* only the sign of long_arg is guaranteed */
if ( long_long_arg > 0 )
long_arg = +1;
else if ( long_long_arg < 0 )
long_arg = -1;
else
long_arg = 0;
break;
#endif
}
}
str_arg = tmp;
str_arg_l = 0;
/* NOTE:
* For d, i, o, u, x, and X conversions, if precision
* is specified, the '0' flag should be ignored. This
* is so with Solaris 2.6, Digital UNIX 4.0 and HPUX 10;
* but not with Perl. */
#ifndef PERL_COMPATIBLE
if ( precision_specified )
zero_padding = 0;
#endif
if ( fmt_spec == 'd' )
{
if ( force_sign && long_arg >= 0 )
tmp[ str_arg_l++ ] =
space_for_positive ? ' ' : '+';
/* leave negative numbers for sprintf to handle,
to avoid handling tricky cases like
(short int)(-32768) */
}
else if ( alternative_form )
{
if ( long_arg != 0
&& ( fmt_spec == 'x' || fmt_spec == 'X' ) )
{
tmp[ str_arg_l++ ] = '0';
tmp[ str_arg_l++ ] = fmt_spec; }
#ifdef HPUX_COMPATIBLE
else if ( fmt_spec == 'p'
/* HPUX 10: for an alternative form of p conversion,
* a nonzero result is prefixed by 0x. */
#ifndef HPUX_BUG_COMPATIBLE
/* Actually it uses 0x prefix even for a zero value. */
&& long_arg != 0
#endif
)
{
tmp[ str_arg_l++ ] = '0';
tmp[ str_arg_l++ ] = 'x';
}
#endif
}
zero_padding_insertion_ind = str_arg_l;
if ( ! precision_specified )
precision = 1; /* default precision is 1 */
if ( precision == 0 && long_arg == 0
#ifdef HPUX_BUG_COMPATIBLE
&& fmt_spec != 'p'
/* HPUX 10 man page claims: With conversion character
* p the result of converting a zero value with a
* precision of zero is a null string.
* Actually it returns all zeroes. */
#endif
)
{
/* converted to null string */
}
else
{
char f[ 5 ];
int f_l = 0;
f[ f_l++ ] = '%';
if ( ! data_type_modifier )
{
}
else if ( data_type_modifier == '2' )
{
f[ f_l++ ] = 'l';
f[ f_l++ ] = 'l';
}
else
f[ f_l++ ] = data_type_modifier;
f[ f_l++ ] = fmt_spec; f[ f_l++ ] = '\0';
if ( fmt_spec == 'p' )
str_arg_l += sprintf( tmp + str_arg_l,
f, ptr_arg );
else
{
switch ( data_type_modifier )
{
case '\0':
case 'h':
str_arg_l += sprintf( tmp + str_arg_l,
f, int_arg );
break;
case 'l':
str_arg_l += sprintf( tmp + str_arg_l, f,
long_arg );
break;
#ifdef SNPRINTF_LONGLONG_SUPPORT
case '2':
str_arg_l += sprintf( tmp + str_arg_l,
f, long_long_arg );
break;
#endif
}
}
if ( zero_padding_insertion_ind < str_arg_l
&& tmp[ zero_padding_insertion_ind ] == '-' )
zero_padding_insertion_ind++;
}
{
int num_of_digits =
str_arg_l - zero_padding_insertion_ind;
if ( alternative_form && fmt_spec == 'o'
#ifdef HPUX_COMPATIBLE /* ("%#.o",0) -> "" */
&& ( str_arg_l > 0 )
#endif
#ifdef DIGITAL_UNIX_BUG_COMPATIBLE /* ("%#o",0) -> "00" */
#else
&& ! ( zero_padding_insertion_ind < str_arg_l
&& tmp[zero_padding_insertion_ind] == '0' )
#endif
)
{
/* assure leading zero for alternative-form
octal numbers */
if ( ! precision_specified
|| precision < num_of_digits + 1 )
{
precision = num_of_digits + 1;
precision_specified = 1;
}
}
/* zero padding to specified precision? */
if ( num_of_digits < precision )
number_of_zeros_to_pad = precision - num_of_digits;
}
/* zero padding to specified minimal field width? */
if ( ! justify_left && zero_padding )
{
int n = min_field_width
- ( str_arg_l + number_of_zeros_to_pad );
if ( n > 0 )
number_of_zeros_to_pad += n;
}
break;
default: /* unrecognized format, keep format string
unchanged */
zero_padding = 0; /* turn zero padding off for
non-numeric formats */
#ifndef DIGITAL_UNIX_COMPATIBLE
justify_left = 1;
min_field_width = 0; /* reset flags */
#endif
#ifdef PERL_COMPATIBLE
/* keep the entire format string unchanged */
str_arg = starting_p;
str_arg_l = p - starting_p;
#else
/* discard the unrecognized format, just keep the
unrecognized fmt char */
str_arg = p;
str_arg_l = 0;
#endif
if ( *p )
str_arg_l++; /* include invalid fmt specifier if
not at EOS */
break;
}
if ( *p )
p++; /* step over the just processed format specifier */
/* insert padding to the left as requested by min_field_width */
if ( ! justify_left )
{ /* left padding with blank or zero */
int n = min_field_width
- ( str_arg_l + number_of_zeros_to_pad );
if ( n > 0 )
{
int avail = ( int ) ( str_m - str_l );
if ( avail > 0 )
{ /* memset(str+str_l, zp, (n>avail?avail:n)); */
const char zp = zero_padding ? '0' : ' ';
int k;
char *r;
for ( r = str + str_l, k= ( n > avail ? avail : n );
k > 0; k-- )
*r++ = zp;
}
str_l += n;
}
}
/* zero padding as requested by the precision for numeric
formats requred?*/
if ( number_of_zeros_to_pad <= 0 )
{
/* will not copy first part of numeric here, *
* force it to be copied later in its entirety */
zero_padding_insertion_ind = 0;
}
else
{
/* insert first part of numerics (sign or '0x') before
zero padding */
int n = zero_padding_insertion_ind;
if ( n > 0 )
{
int avail = ( int ) ( str_m - str_l );
if ( avail > 0 )
memcpy( str + str_l, str_arg,
( size_t ) ( n > avail ? avail : n ) );
str_l += n;
}
/* insert zero padding as requested by the precision */
n = number_of_zeros_to_pad;
if ( n > 0 )
{
int avail = ( int ) ( str_m - str_l );
if ( avail > 0 )
{ /* memset(str+str_l, '0', (n>avail?avail:n)); */
int k;
char *r;
for ( r = str + str_l, k = ( n > avail ? avail : n );
k > 0; k-- )
*r++ = '0';
}
str_l += n;
}
}
/* insert formatted string (or unmodified format for unknown
formats) */
{
int n = str_arg_l - zero_padding_insertion_ind;
if ( n > 0 )
{
int avail = ( int ) ( str_m - str_l );
if ( avail > 0 )
memcpy( str + str_l,
str_arg + zero_padding_insertion_ind,
( size_t ) ( n > avail ? avail : n ) );
str_l += n;
}
}
/* insert right padding */
if ( justify_left )
{ /* right blank padding to the field width */
int n = min_field_width
- ( str_arg_l + number_of_zeros_to_pad );
if ( n > 0 )
{
int avail = ( int ) ( str_m - str_l );
if ( avail > 0 )
{ /* memset(str+str_l, ' ', (n>avail?avail:n)); */
int k;
char *r;
for ( r = str + str_l, k= n > avail ? avail : n;
k > 0; k-- )
*r++ = ' ';
}
str_l += n;
}
}
}
}
#if defined(NEED_SNPRINTF_ONLY)
va_end( ap );
#endif
if ( str_m > 0 )
{ /* make sure the string is null-terminated
even at the expense of overwriting the last character */
str[ str_l <= str_m - 1 ? str_l : str_m-1 ] = '\0';
}
return str_l; /* return the number of characters formatted
(excluding trailing null character),
that is, the number of characters that would have been
written to the buffer if it were large enough */
}
#endif
/*
* Local variables:
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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