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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 portable_snprintf
* (and 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 portable_snprintf
* (and 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 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 **ptr, const char *fmt, /*args*/ ...);
#endif
#if defined(NEED_VASPRINTF)
int vasprintf (char **ptr, const char *fmt, va_list ap);
#endif
#if defined(NEED_ASNPRINTF)
int asnprintf (char **ptr, size_t str_m, const char *fmt, /*args*/ ...);
#endif
#if defined(NEED_VASNPRINTF)
int vasnprintf (char **ptr, size_t str_m, const char *fmt, va_list ap);
#endif
#ifndef va_copy
#define va_copy(ap2,ap) ap2 = ap
#endif
#if defined(HAVE_SNPRINTF)
/* declare our portable snprintf routine under name portable_snprintf */
/* declare our portable vsnprintf routine under name portable_vsnprintf */
#else
/* declare our portable routines under names snprintf and vsnprintf */
#define portable_snprintf snprintf
#if !defined(NEED_SNPRINTF_ONLY)
#define portable_vsnprintf vsnprintf
#endif
#endif
#if !defined(HAVE_SNPRINTF) || defined(PREFER_PORTABLE_SNPRINTF)
int portable_snprintf(char *str, size_t str_m, const char *fmt, /*args*/ ...);
#if !defined(NEED_SNPRINTF_ONLY)
int portable_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap);
#endif
#endif
/* declarations */
#if !defined(lint)
static char credits[] = "\n\
@(#)snprintf.c, v2.1: Mark Martinec, <mark.martinec@ijs.si>\n\
@(#)snprintf.c, v2.1: Copyright 1999, Mark Martinec. Artistic license applies.\n\
@(#)snprintf.c, v2.1: http://www.ijs.si/software/snprintf/\n";
#endif
#if defined(NEED_ASPRINTF)
int asprintf(char **ptr, const char *fmt, /*args*/ ...) {
va_list ap;
size_t str_m;
int str_l;
*ptr = NULL;
va_start(ap, fmt); /* measure the required size */
str_l = portable_vsnprintf(NULL, (size_t) 0, fmt, ap);
va_end(ap);
assert(str_l >= 0); /* possible integer overflow if str_m > INT_MAX */
*ptr = (char *) malloc(str_m = (size_t)str_l + 1);
if (*ptr == NULL) { errno = ENOMEM; str_l = -1; }
else {
int str_l2;
va_start(ap, fmt);
str_l2 = 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 = portable_vsnprintf(NULL, (size_t) 0, fmt, ap2);
va_end(ap2);
}
assert(str_l >= 0); /* possible integer overflow if str_m > INT_MAX */
*ptr = (char *) malloc(str_m = (size_t)str_l + 1);
if (*ptr == NULL) { errno = ENOMEM; str_l = -1; }
else {
int str_l2 = 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, /*args*/ ...) {
va_list ap;
int str_l;
*ptr = NULL;
va_start(ap, fmt); /* measure the required size */
str_l = 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 = (char *) malloc(str_m);
if (*ptr == NULL) { errno = ENOMEM; str_l = -1; }
else {
int str_l2;
va_start(ap, fmt);
str_l2 = 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 = 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 = (char *) malloc(str_m);
if (*ptr == NULL) { errno = ENOMEM; str_l = -1; }
else {
int str_l2 = 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 portable_snprintf(char *str, size_t str_m, const char *fmt, /*args*/ ...) {
va_list ap;
int str_l;
va_start(ap, fmt);
str_l = portable_vsnprintf(str, str_m, fmt, ap);
va_end(ap);
return str_l;
}
#endif
#if defined(NEED_SNPRINTF_ONLY)
int portable_snprintf(char *str, size_t str_m, const char *fmt, /*args*/ ...) {
#else
int 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) {
register int k; register char *r; register 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 = 0;/* 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' : ' ');
register int k; register 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)); */
register int k; register 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)); */
register int k; register 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
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