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snprintf.c
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snprintf.c
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/* $Id: snprintf.c,v 1.9 2008/01/20 14:02:00 holger Exp $ */
/*
* Copyright (c) 1995 Patrick Powell.
*
* This code is based on code written by Patrick Powell <[email protected]>.
* It may be used for any purpose as long as this notice remains intact on all
* source code distributions.
*/
/*
* Copyright (c) 2008 Holger Weiss.
*
* This version of the code is maintained by Holger Weiss <[email protected]>.
* My changes to the code may freely be used, modified and/or redistributed for
* any purpose. It would be nice if additions and fixes to this file (including
* trivial code cleanups) would be sent back in order to let me include them in
* the version available at <http://www.jhweiss.de/software/snprintf.html>.
* However, this is not a requirement for using or redistributing (possibly
* modified) versions of this file, nor is leaving this notice intact mandatory.
*/
/*
* History
*
* 2008-01-20 Holger Weiss <[email protected]> for C99-snprintf 1.1:
*
* Fixed the detection of infinite floating point values on IRIX (and
* possibly other systems) and applied another few minor cleanups.
*
* 2008-01-06 Holger Weiss <[email protected]> for C99-snprintf 1.0:
*
* Added a lot of new features, fixed many bugs, and incorporated various
* improvements done by Andrew Tridgell <[email protected]>, Russ Allbery
* <[email protected]>, Hrvoje Niksic <[email protected]>, Damien Miller
* <[email protected]>, and others for the Samba, INN, Wget, and OpenSSH
* projects. The additions include: support the "e", "E", "g", "G", and
* "F" conversion specifiers (and use conversion style "f" or "F" for the
* still unsupported "a" and "A" specifiers); support the "hh", "ll", "j",
* "t", and "z" length modifiers; support the "#" flag and the (non-C99)
* "'" flag; use localeconv(3) (if available) to get both the current
* locale's decimal point character and the separator between groups of
* digits; fix the handling of various corner cases of field width and
* precision specifications; fix various floating point conversion bugs;
* handle infinite and NaN floating point values; don't attempt to write to
* the output buffer (which may be NULL) if a size of zero was specified;
* check for integer overflow of the field width, precision, and return
* values and during the floating point conversion; use the OUTCHAR() macro
* instead of a function for better performance; provide asprintf(3) and
* vasprintf(3) functions; add new test cases. The replacement functions
* have been renamed to use an "rpl_" prefix, the function calls in the
* main project (and in this file) must be redefined accordingly for each
* replacement function which is needed (by using Autoconf or other means).
* Various other minor improvements have been applied and the coding style
* was cleaned up for consistency.
*
* 2007-07-23 Holger Weiss <[email protected]> for Mutt 1.5.13:
*
* C99 compliant snprintf(3) and vsnprintf(3) functions return the number
* of characters that would have been written to a sufficiently sized
* buffer (excluding the '\0'). The original code simply returned the
* length of the resulting output string, so that's been fixed.
*
* 1998-03-05 Michael Elkins <[email protected]> for Mutt 0.90.8:
*
* The original code assumed that both snprintf(3) and vsnprintf(3) were
* missing. Some systems only have snprintf(3) but not vsnprintf(3), so
* the code is now broken down under HAVE_SNPRINTF and HAVE_VSNPRINTF.
*
* 1998-01-27 Thomas Roessler <[email protected]> for Mutt 0.89i:
*
* The PGP code was using unsigned hexadecimal formats. Unfortunately,
* unsigned formats simply didn't work.
*
* 1997-10-22 Brandon Long <[email protected]> for Mutt 0.87.1:
*
* Ok, added some minimal floating point support, which means this probably
* requires libm on most operating systems. Don't yet support the exponent
* (e,E) and sigfig (g,G). Also, fmtint() was pretty badly broken, it just
* wasn't being exercised in ways which showed it, so that's been fixed.
* Also, formatted the code to Mutt conventions, and removed dead code left
* over from the original. Also, there is now a builtin-test, run with:
* gcc -DTEST_SNPRINTF -o snprintf snprintf.c -lm && ./snprintf
*
* 2996-09-15 Brandon Long <[email protected]> for Mutt 0.43:
*
* This was ugly. It is still ugly. I opted out of floating point
* numbers, but the formatter understands just about everything from the
* normal C string format, at least as far as I can tell from the Solaris
* 2.5 printf(3S) man page.
*/
/*
* ToDo
*
* - Add wide character support.
* - Add support for "%a" and "%A" conversions.
* - Create test routines which predefine the expected results. Our test cases
* usually expose bugs in system implementations rather than in ours :-)
*/
/*
* Usage
*
* 1) The following preprocessor macros should be defined to 1 if the feature or
* file in question is available on the target system (by using Autoconf or
* other means), though basic functionality should be available as long as
* HAVE_STDARG_H and HAVE_STDLIB_H are defined correctly:
*
* HAVE_VSNPRINTF
* HAVE_SNPRINTF
* HAVE_VASPRINTF
* HAVE_ASPRINTF
* HAVE_STDARG_H
* HAVE_STDDEF_H
* HAVE_STDINT_H
* HAVE_STDLIB_H
* HAVE_INTTYPES_H
* HAVE_LOCALE_H
* HAVE_LOCALECONV
* HAVE_LCONV_DECIMAL_POINT
* HAVE_LCONV_THOUSANDS_SEP
* HAVE_LONG_DOUBLE
* HAVE_LONG_LONG_INT
* HAVE_UNSIGNED_LONG_LONG_INT
* HAVE_INTMAX_T
* HAVE_UINTMAX_T
* HAVE_UINTPTR_T
* HAVE_PTRDIFF_T
* HAVE_VA_COPY
* HAVE___VA_COPY
*
* 2) The calls to the functions which should be replaced must be redefined
* throughout the project files (by using Autoconf or other means):
*
* #define vsnprintf rpl_vsnprintf
* #define snprintf rpl_snprintf
* #define vasprintf rpl_vasprintf
* #define asprintf rpl_asprintf
*
* 3) The required replacement functions should be declared in some header file
* included throughout the project files:
*
* #if HAVE_CONFIG_H
* #include <config.h>
* #endif
* #if HAVE_STDARG_H
* #include <stdarg.h>
* #if !HAVE_VSNPRINTF
* int rpl_vsnprintf(char *, size_t, const char *, va_list);
* #endif
* #if !HAVE_SNPRINTF
* int rpl_snprintf(char *, size_t, const char *, ...);
* #endif
* #if !HAVE_VASPRINTF
* int rpl_vasprintf(char **, const char *, va_list);
* #endif
* #if !HAVE_ASPRINTF
* int rpl_asprintf(char **, const char *, ...);
* #endif
* #endif
*
* Autoconf macros for handling step 1 and step 2 are available at
* <http://www.jhweiss.de/software/snprintf.html>.
*/
#if HAVE_CONFIG_H
#include <config.h>
#endif /* HAVE_CONFIG_H */
#if TEST_SNPRINTF
#include <math.h> /* For pow(3), NAN, and INFINITY. */
#include <string.h> /* For strcmp(3). */
#if defined(__NetBSD__) || \
defined(__FreeBSD__) || \
defined(__OpenBSD__) || \
defined(__NeXT__) || \
defined(__bsd__)
#define OS_BSD 1
#elif defined(sgi) || defined(__sgi)
#ifndef __c99
#define __c99 /* Force C99 mode to get <stdint.h> included on IRIX 6.5.30. */
#endif /* !defined(__c99) */
#define OS_IRIX 1
#define OS_SYSV 1
#elif defined(__svr4__)
#define OS_SYSV 1
#elif defined(__linux__)
#define OS_LINUX 1
#endif /* defined(__NetBSD__) || defined(__FreeBSD__) || [...] */
#if HAVE_CONFIG_H /* Undefine definitions possibly done in config.h. */
#ifdef HAVE_SNPRINTF
#undef HAVE_SNPRINTF
#endif /* defined(HAVE_SNPRINTF) */
#ifdef HAVE_VSNPRINTF
#undef HAVE_VSNPRINTF
#endif /* defined(HAVE_VSNPRINTF) */
#ifdef HAVE_ASPRINTF
#undef HAVE_ASPRINTF
#endif /* defined(HAVE_ASPRINTF) */
#ifdef HAVE_VASPRINTF
#undef HAVE_VASPRINTF
#endif /* defined(HAVE_VASPRINTF) */
#ifdef snprintf
#undef snprintf
#endif /* defined(snprintf) */
#ifdef vsnprintf
#undef vsnprintf
#endif /* defined(vsnprintf) */
#ifdef asprintf
#undef asprintf
#endif /* defined(asprintf) */
#ifdef vasprintf
#undef vasprintf
#endif /* defined(vasprintf) */
#else /* By default, we assume a modern system for testing. */
#ifndef HAVE_STDARG_H
#define HAVE_STDARG_H 1
#endif /* HAVE_STDARG_H */
#ifndef HAVE_STDDEF_H
#define HAVE_STDDEF_H 1
#endif /* HAVE_STDDEF_H */
#ifndef HAVE_STDINT_H
#define HAVE_STDINT_H 1
#endif /* HAVE_STDINT_H */
#ifndef HAVE_STDLIB_H
#define HAVE_STDLIB_H 1
#endif /* HAVE_STDLIB_H */
#ifndef HAVE_INTTYPES_H
#define HAVE_INTTYPES_H 1
#endif /* HAVE_INTTYPES_H */
#ifndef HAVE_LOCALE_H
#define HAVE_LOCALE_H 1
#endif /* HAVE_LOCALE_H */
#ifndef HAVE_LOCALECONV
#define HAVE_LOCALECONV 1
#endif /* !defined(HAVE_LOCALECONV) */
#ifndef HAVE_LCONV_DECIMAL_POINT
#define HAVE_LCONV_DECIMAL_POINT 1
#endif /* HAVE_LCONV_DECIMAL_POINT */
#ifndef HAVE_LCONV_THOUSANDS_SEP
#define HAVE_LCONV_THOUSANDS_SEP 1
#endif /* HAVE_LCONV_THOUSANDS_SEP */
#ifndef HAVE_LONG_DOUBLE
#define HAVE_LONG_DOUBLE 1
#endif /* !defined(HAVE_LONG_DOUBLE) */
#ifndef HAVE_LONG_LONG_INT
#define HAVE_LONG_LONG_INT 1
#endif /* !defined(HAVE_LONG_LONG_INT) */
#ifndef HAVE_UNSIGNED_LONG_LONG_INT
#define HAVE_UNSIGNED_LONG_LONG_INT 1
#endif /* !defined(HAVE_UNSIGNED_LONG_LONG_INT) */
#ifndef HAVE_INTMAX_T
#define HAVE_INTMAX_T 1
#endif /* !defined(HAVE_INTMAX_T) */
#ifndef HAVE_UINTMAX_T
#define HAVE_UINTMAX_T 1
#endif /* !defined(HAVE_UINTMAX_T) */
#ifndef HAVE_UINTPTR_T
#define HAVE_UINTPTR_T 1
#endif /* !defined(HAVE_UINTPTR_T) */
#ifndef HAVE_PTRDIFF_T
#define HAVE_PTRDIFF_T 1
#endif /* !defined(HAVE_PTRDIFF_T) */
#ifndef HAVE_VA_COPY
#define HAVE_VA_COPY 1
#endif /* !defined(HAVE_VA_COPY) */
#ifndef HAVE___VA_COPY
#define HAVE___VA_COPY 1
#endif /* !defined(HAVE___VA_COPY) */
#endif /* HAVE_CONFIG_H */
#define snprintf rpl_snprintf
#define vsnprintf rpl_vsnprintf
#define asprintf rpl_asprintf
#define vasprintf rpl_vasprintf
#endif /* TEST_SNPRINTF */
#if !HAVE_SNPRINTF || !HAVE_VSNPRINTF || !HAVE_ASPRINTF || !HAVE_VASPRINTF
#include <stdio.h> /* For NULL, size_t, vsnprintf(3), and vasprintf(3). */
#ifdef VA_START
#undef VA_START
#endif /* defined(VA_START) */
#ifdef VA_SHIFT
#undef VA_SHIFT
#endif /* defined(VA_SHIFT) */
#if HAVE_STDARG_H
#include <stdarg.h>
#define VA_START(ap, last) va_start(ap, last)
#define VA_SHIFT(ap, value, type) /* No-op for ANSI C. */
#else /* Assume <varargs.h> is available. */
#include <varargs.h>
#define VA_START(ap, last) va_start(ap) /* "last" is ignored. */
#define VA_SHIFT(ap, value, type) value = va_arg(ap, type)
#endif /* HAVE_STDARG_H */
#if !HAVE_VSNPRINTF
int rpl_vsnprintf(char *, size_t, const char *, va_list);
#define vsnprintf rpl_vsnprintf
#endif
#if !HAVE_SNPRINTF
int rpl_snprintf(char *, size_t, const char *, ...);
#define snprintf rpl_snprintf
#endif
#if !HAVE_VASPRINTF
int rpl_vasprintf(char **, const char *, va_list);
#define vasprintf rpl_vasprintf
#endif
#if !HAVE_ASPRINTF
int rpl_asprintf(char **, const char *, ...);
#define asprintf rpl_asprintf
#endif
#if !HAVE_VASPRINTF
#if HAVE_STDLIB_H
#include <stdlib.h> /* For malloc(3). */
#endif /* HAVE_STDLIB_H */
#ifdef VA_COPY
#undef VA_COPY
#endif /* defined(VA_COPY) */
#ifdef VA_END_COPY
#undef VA_END_COPY
#endif /* defined(VA_END_COPY) */
#if HAVE_VA_COPY
#define VA_COPY(dest, src) va_copy(dest, src)
#define VA_END_COPY(ap) va_end(ap)
#elif HAVE___VA_COPY
#define VA_COPY(dest, src) __va_copy(dest, src)
#define VA_END_COPY(ap) va_end(ap)
#else
#define VA_COPY(dest, src) (void)mymemcpy(&dest, &src, sizeof(va_list))
#define VA_END_COPY(ap) /* No-op. */
#define NEED_MYMEMCPY 1
static void *mymemcpy(void *, void *, size_t);
#endif /* HAVE_VA_COPY */
#endif /* !HAVE_VASPRINTF */
#if !HAVE_VSNPRINTF
#include <errno.h> /* For ERANGE and errno. */
#include <limits.h> /* For *_MAX. */
#if HAVE_INTTYPES_H
#include <inttypes.h> /* For intmax_t (if not defined in <stdint.h>). */
#endif /* HAVE_INTTYPES_H */
#if HAVE_LOCALE_H
#include <locale.h> /* For localeconv(3). */
#endif /* HAVE_LOCALE_H */
#if HAVE_STDDEF_H
#include <stddef.h> /* For ptrdiff_t. */
#endif /* HAVE_STDDEF_H */
#if HAVE_STDINT_H
#include <stdint.h> /* For intmax_t. */
#endif /* HAVE_STDINT_H */
/* Support for unsigned long long int. We may also need ULLONG_MAX. */
#ifndef ULONG_MAX /* We may need ULONG_MAX as a fallback. */
#ifdef UINT_MAX
#define ULONG_MAX UINT_MAX
#else
#define ULONG_MAX INT_MAX
#endif /* defined(UINT_MAX) */
#endif /* !defined(ULONG_MAX) */
#ifdef ULLONG
#undef ULLONG
#endif /* defined(ULLONG) */
#if HAVE_UNSIGNED_LONG_LONG_INT
#define ULLONG unsigned long long int
#ifndef ULLONG_MAX
#define ULLONG_MAX ULONG_MAX
#endif /* !defined(ULLONG_MAX) */
#else
#define ULLONG unsigned long int
#ifdef ULLONG_MAX
#undef ULLONG_MAX
#endif /* defined(ULLONG_MAX) */
#define ULLONG_MAX ULONG_MAX
#endif /* HAVE_LONG_LONG_INT */
/* Support for uintmax_t. We also need UINTMAX_MAX. */
#ifdef UINTMAX_T
#undef UINTMAX_T
#endif /* defined(UINTMAX_T) */
#if HAVE_UINTMAX_T || defined(uintmax_t)
#define UINTMAX_T uintmax_t
#ifndef UINTMAX_MAX
#define UINTMAX_MAX ULLONG_MAX
#endif /* !defined(UINTMAX_MAX) */
#else
#define UINTMAX_T ULLONG
#ifdef UINTMAX_MAX
#undef UINTMAX_MAX
#endif /* defined(UINTMAX_MAX) */
#define UINTMAX_MAX ULLONG_MAX
#endif /* HAVE_UINTMAX_T || defined(uintmax_t) */
/* Support for long double. */
#ifndef LDOUBLE
#if HAVE_LONG_DOUBLE
#define LDOUBLE long double
#else
#define LDOUBLE double
#endif /* HAVE_LONG_DOUBLE */
#endif /* !defined(LDOUBLE) */
/* Support for long long int. */
#ifndef LLONG
#if HAVE_LONG_LONG_INT
#define LLONG long long int
#else
#define LLONG long int
#endif /* HAVE_LONG_LONG_INT */
#endif /* !defined(LLONG) */
/* Support for intmax_t. */
#ifndef INTMAX_T
#if HAVE_INTMAX_T || defined(intmax_t)
#define INTMAX_T intmax_t
#else
#define INTMAX_T LLONG
#endif /* HAVE_INTMAX_T || defined(intmax_t) */
#endif /* !defined(INTMAX_T) */
/* Support for uintptr_t. */
#ifndef UINTPTR_T
#if HAVE_UINTPTR_T || defined(uintptr_t)
#define UINTPTR_T uintptr_t
#else
#define UINTPTR_T unsigned long int
#endif /* HAVE_UINTPTR_T || defined(uintptr_t) */
#endif /* !defined(UINTPTR_T) */
/* Support for ptrdiff_t. */
#ifndef PTRDIFF_T
#if HAVE_PTRDIFF_T || defined(ptrdiff_t)
#define PTRDIFF_T ptrdiff_t
#else
#define PTRDIFF_T long int
#endif /* HAVE_PTRDIFF_T || defined(ptrdiff_t) */
#endif /* !defined(PTRDIFF_T) */
/*
* We need an unsigned integer type corresponding to ptrdiff_t (cf. C99:
* 7.19.6.1, 7). However, we'll simply use PTRDIFF_T and convert it to an
* unsigned type if necessary. This should work just fine in practice.
*/
#ifndef UPTRDIFF_T
#define UPTRDIFF_T PTRDIFF_T
#endif /* !defined(UPTRDIFF_T) */
/*
* We need a signed integer type corresponding to size_t (cf. C99: 7.19.6.1, 7).
* However, we'll simply use size_t and convert it to a signed type if
* necessary. This should work just fine in practice.
*/
#ifndef SSIZE_T
#define SSIZE_T size_t
#endif /* !defined(SSIZE_T) */
/* Either ERANGE or E2BIG should be available everywhere. */
#ifndef ERANGE
#define ERANGE E2BIG
#endif /* !defined(ERANGE) */
#ifndef EOVERFLOW
#define EOVERFLOW ERANGE
#endif /* !defined(EOVERFLOW) */
/*
* Buffer size to hold the octal string representation of UINT128_MAX without
* nul-termination ("3777777777777777777777777777777777777777777").
*/
#ifdef MAX_CONVERT_LENGTH
#undef MAX_CONVERT_LENGTH
#endif /* defined(MAX_CONVERT_LENGTH) */
#define MAX_CONVERT_LENGTH 43
/* Format read states. */
#define PRINT_S_DEFAULT 0
#define PRINT_S_FLAGS 1
#define PRINT_S_WIDTH 2
#define PRINT_S_DOT 3
#define PRINT_S_PRECISION 4
#define PRINT_S_MOD 5
#define PRINT_S_CONV 6
/* Format flags. */
#define PRINT_F_MINUS (1 << 0)
#define PRINT_F_PLUS (1 << 1)
#define PRINT_F_SPACE (1 << 2)
#define PRINT_F_NUM (1 << 3)
#define PRINT_F_ZERO (1 << 4)
#define PRINT_F_QUOTE (1 << 5)
#define PRINT_F_UP (1 << 6)
#define PRINT_F_UNSIGNED (1 << 7)
#define PRINT_F_TYPE_G (1 << 8)
#define PRINT_F_TYPE_E (1 << 9)
/* Conversion flags. */
#define PRINT_C_CHAR 1
#define PRINT_C_SHORT 2
#define PRINT_C_LONG 3
#define PRINT_C_LLONG 4
#define PRINT_C_LDOUBLE 5
#define PRINT_C_SIZE 6
#define PRINT_C_PTRDIFF 7
#define PRINT_C_INTMAX 8
#ifndef MAX
#define MAX(x, y) ((x >= y) ? x : y)
#endif /* !defined(MAX) */
#ifndef CHARTOINT
#define CHARTOINT(ch) (ch - '0')
#endif /* !defined(CHARTOINT) */
#ifndef ISDIGIT
#define ISDIGIT(ch) ('0' <= (unsigned char)ch && (unsigned char)ch <= '9')
#endif /* !defined(ISDIGIT) */
#ifndef ISNAN
#define ISNAN(x) (x != x)
#endif /* !defined(ISNAN) */
#ifndef ISINF
#define ISINF(x) (x != 0.0 && x + x == x)
#endif /* !defined(ISINF) */
#ifdef OUTCHAR
#undef OUTCHAR
#endif /* defined(OUTCHAR) */
#define OUTCHAR(str, len, size, ch) \
do { \
if (len + 1 < size) \
str[len] = ch; \
(len)++; \
} while (/* CONSTCOND */ 0)
static void fmtstr(char *, size_t *, size_t, const char *, int, int, int);
static void fmtint(char *, size_t *, size_t, INTMAX_T, int, int, int, int);
static void fmtflt(char *, size_t *, size_t, LDOUBLE, int, int, int, int *);
static void printsep(char *, size_t *, size_t);
static int getnumsep(int);
static int getexponent(LDOUBLE);
static int convert(UINTMAX_T, char *, size_t, int, int);
static UINTMAX_T cast(LDOUBLE);
static UINTMAX_T myround(LDOUBLE);
static LDOUBLE mypow10(int);
#ifndef __MINGW32__
extern int errno;
#endif
int
rpl_vsnprintf(char *str, size_t size, const char *format, va_list args)
{
LDOUBLE fvalue;
INTMAX_T value;
unsigned char cvalue;
const char *strvalue;
INTMAX_T *intmaxptr;
PTRDIFF_T *ptrdiffptr;
SSIZE_T *sizeptr;
LLONG *llongptr;
long int *longptr;
int *intptr;
short int *shortptr;
signed char *charptr;
size_t len = 0;
int overflow = 0;
int base = 0;
int cflags = 0;
int flags = 0;
int width = 0;
int precision = -1;
int state = PRINT_S_DEFAULT;
char ch = *format++;
/*
* C99 says: "If `n' is zero, nothing is written, and `s' may be a null
* pointer." (7.19.6.5, 2) We're forgiving and allow a NULL pointer
* even if a size larger than zero was specified. At least NetBSD's
* snprintf(3) does the same, as well as other versions of this file.
* (Though some of these versions will write to a non-NULL buffer even
* if a size of zero was specified, which violates the standard.)
*/
if (str == NULL && size != 0)
size = 0;
while (ch != '\0')
switch (state) {
case PRINT_S_DEFAULT:
if (ch == '%')
state = PRINT_S_FLAGS;
else
OUTCHAR(str, len, size, ch);
ch = *format++;
break;
case PRINT_S_FLAGS:
switch (ch) {
case '-':
flags |= PRINT_F_MINUS;
ch = *format++;
break;
case '+':
flags |= PRINT_F_PLUS;
ch = *format++;
break;
case ' ':
flags |= PRINT_F_SPACE;
ch = *format++;
break;
case '#':
flags |= PRINT_F_NUM;
ch = *format++;
break;
case '0':
flags |= PRINT_F_ZERO;
ch = *format++;
break;
case '\'': /* SUSv2 flag (not in C99). */
flags |= PRINT_F_QUOTE;
ch = *format++;
break;
default:
state = PRINT_S_WIDTH;
break;
}
break;
case PRINT_S_WIDTH:
if (ISDIGIT(ch)) {
ch = CHARTOINT(ch);
if (width > (INT_MAX - ch) / 10) {
overflow = 1;
goto out;
}
width = 10 * width + ch;
ch = *format++;
} else if (ch == '*') {
/*
* C99 says: "A negative field width argument is
* taken as a `-' flag followed by a positive
* field width." (7.19.6.1, 5)
*/
if ((width = va_arg(args, int)) < 0) {
flags |= PRINT_F_MINUS;
width = -width;
}
ch = *format++;
state = PRINT_S_DOT;
} else
state = PRINT_S_DOT;
break;
case PRINT_S_DOT:
if (ch == '.') {
state = PRINT_S_PRECISION;
ch = *format++;
} else
state = PRINT_S_MOD;
break;
case PRINT_S_PRECISION:
if (precision == -1)
precision = 0;
if (ISDIGIT(ch)) {
ch = CHARTOINT(ch);
if (precision > (INT_MAX - ch) / 10) {
overflow = 1;
goto out;
}
precision = 10 * precision + ch;
ch = *format++;
} else if (ch == '*') {
/*
* C99 says: "A negative precision argument is
* taken as if the precision were omitted."
* (7.19.6.1, 5)
*/
if ((precision = va_arg(args, int)) < 0)
precision = -1;
ch = *format++;
state = PRINT_S_MOD;
} else
state = PRINT_S_MOD;
break;
case PRINT_S_MOD:
switch (ch) {
case 'h':
ch = *format++;
if (ch == 'h') { /* It's a char. */
ch = *format++;
cflags = PRINT_C_CHAR;
} else
cflags = PRINT_C_SHORT;
break;
case 'l':
ch = *format++;
if (ch == 'l') { /* It's a long long. */
ch = *format++;
cflags = PRINT_C_LLONG;
} else
cflags = PRINT_C_LONG;
break;
case 'L':
cflags = PRINT_C_LDOUBLE;
ch = *format++;
break;
case 'j':
cflags = PRINT_C_INTMAX;
ch = *format++;
break;
case 't':
cflags = PRINT_C_PTRDIFF;
ch = *format++;
break;
case 'z':
cflags = PRINT_C_SIZE;
ch = *format++;
break;
}
state = PRINT_S_CONV;
break;
case PRINT_S_CONV:
switch (ch) {
case 'd':
/* FALLTHROUGH */
case 'i':
switch (cflags) {
case PRINT_C_CHAR:
value = (signed char)va_arg(args, int);
break;
case PRINT_C_SHORT:
value = (short int)va_arg(args, int);
break;
case PRINT_C_LONG:
value = va_arg(args, long int);
break;
case PRINT_C_LLONG:
value = va_arg(args, LLONG);
break;
case PRINT_C_SIZE:
value = va_arg(args, SSIZE_T);
break;
case PRINT_C_INTMAX:
value = va_arg(args, INTMAX_T);
break;
case PRINT_C_PTRDIFF:
value = va_arg(args, PTRDIFF_T);
break;
default:
value = va_arg(args, int);
break;
}
fmtint(str, &len, size, value, 10, width,
precision, flags);
break;
case 'X':
flags |= PRINT_F_UP;
/* FALLTHROUGH */
case 'x':
base = 16;
/* FALLTHROUGH */
case 'o':
if (base == 0)
base = 8;
/* FALLTHROUGH */
case 'u':
if (base == 0)
base = 10;
flags |= PRINT_F_UNSIGNED;
switch (cflags) {
case PRINT_C_CHAR:
value = (unsigned char)va_arg(args,
unsigned int);
break;
case PRINT_C_SHORT:
value = (unsigned short int)va_arg(args,
unsigned int);
break;
case PRINT_C_LONG:
value = va_arg(args, unsigned long int);
break;
case PRINT_C_LLONG:
value = va_arg(args, ULLONG);
break;
case PRINT_C_SIZE:
value = va_arg(args, size_t);
break;
case PRINT_C_INTMAX:
value = va_arg(args, UINTMAX_T);
break;
case PRINT_C_PTRDIFF:
value = va_arg(args, UPTRDIFF_T);
break;
default:
value = va_arg(args, unsigned int);
break;
}
fmtint(str, &len, size, value, base, width,
precision, flags);
break;
case 'A':
/* Not yet supported, we'll use "%F". */
/* FALLTHROUGH */
case 'F':
flags |= PRINT_F_UP;
case 'a':
/* Not yet supported, we'll use "%f". */
/* FALLTHROUGH */
case 'f':
if (cflags == PRINT_C_LDOUBLE)
fvalue = va_arg(args, LDOUBLE);
else
fvalue = va_arg(args, double);
fmtflt(str, &len, size, fvalue, width,
precision, flags, &overflow);
if (overflow)
goto out;
break;
case 'E':
flags |= PRINT_F_UP;
/* FALLTHROUGH */
case 'e':
flags |= PRINT_F_TYPE_E;
if (cflags == PRINT_C_LDOUBLE)
fvalue = va_arg(args, LDOUBLE);
else
fvalue = va_arg(args, double);
fmtflt(str, &len, size, fvalue, width,
precision, flags, &overflow);
if (overflow)
goto out;
break;
case 'G':
flags |= PRINT_F_UP;
/* FALLTHROUGH */
case 'g':
flags |= PRINT_F_TYPE_G;
if (cflags == PRINT_C_LDOUBLE)
fvalue = va_arg(args, LDOUBLE);
else
fvalue = va_arg(args, double);
/*
* If the precision is zero, it is treated as
* one (cf. C99: 7.19.6.1, 8).
*/
if (precision == 0)
precision = 1;
fmtflt(str, &len, size, fvalue, width,
precision, flags, &overflow);
if (overflow)
goto out;
break;
case 'c':
cvalue = va_arg(args, int);
OUTCHAR(str, len, size, cvalue);
break;
case 's':
strvalue = va_arg(args, char *);
fmtstr(str, &len, size, strvalue, width,
precision, flags);
break;
case 'p':
/*
* C99 says: "The value of the pointer is
* converted to a sequence of printing
* characters, in an implementation-defined
* manner." (C99: 7.19.6.1, 8)
*/
if ((strvalue = va_arg(args, void *)) == NULL)
/*
* We use the glibc format. BSD prints
* "0x0", SysV "0".
*/
fmtstr(str, &len, size, "(nil)", width,
-1, flags);
else {
/*
* We use the BSD/glibc format. SysV
* omits the "0x" prefix (which we emit
* using the PRINT_F_NUM flag).
*/
flags |= PRINT_F_NUM;
flags |= PRINT_F_UNSIGNED;
fmtint(str, &len, size,
(UINTPTR_T)strvalue, 16, width,
precision, flags);
}
break;
case 'n':
switch (cflags) {
case PRINT_C_CHAR:
charptr = va_arg(args, signed char *);
*charptr = len;
break;
case PRINT_C_SHORT:
shortptr = va_arg(args, short int *);
*shortptr = len;
break;
case PRINT_C_LONG:
longptr = va_arg(args, long int *);
*longptr = len;
break;
case PRINT_C_LLONG:
llongptr = va_arg(args, LLONG *);
*llongptr = len;
break;
case PRINT_C_SIZE:
/*
* C99 says that with the "z" length
* modifier, "a following `n' conversion
* specifier applies to a pointer to a
* signed integer type corresponding to
* size_t argument." (7.19.6.1, 7)
*/
sizeptr = va_arg(args, SSIZE_T *);
*sizeptr = len;
break;
case PRINT_C_INTMAX:
intmaxptr = va_arg(args, INTMAX_T *);
*intmaxptr = len;
break;
case PRINT_C_PTRDIFF:
ptrdiffptr = va_arg(args, PTRDIFF_T *);
*ptrdiffptr = len;
break;
default:
intptr = va_arg(args, int *);
*intptr = len;
break;
}
break;
case '%': /* Print a "%" character verbatim. */
OUTCHAR(str, len, size, ch);
break;
default: /* Skip other characters. */
break;
}
ch = *format++;
state = PRINT_S_DEFAULT;
base = cflags = flags = width = 0;
precision = -1;
break;
}
out:
if (len < size)
str[len] = '\0';
else if (size > 0)
str[size - 1] = '\0';
if (overflow || len >= INT_MAX) {
errno = overflow ? EOVERFLOW : ERANGE;
return -1;
}
return (int)len;
}
static void
fmtstr(char *str, size_t *len, size_t size, const char *value, int width,
int precision, int flags)
{
int padlen, strln; /* Amount to pad. */
int noprecision = (precision == -1);
if (value == NULL) /* We're forgiving. */
value = "(null)";
/* If a precision was specified, don't read the string past it. */
for (strln = 0; value[strln] != '\0' &&
(noprecision || strln < precision); strln++)
continue;
if ((padlen = width - strln) < 0)
padlen = 0;
if (flags & PRINT_F_MINUS) /* Left justify. */
padlen = -padlen;
while (padlen > 0) { /* Leading spaces. */
OUTCHAR(str, *len, size, ' ');
padlen--;
}
while (*value != '\0' && (noprecision || precision-- > 0)) {
OUTCHAR(str, *len, size, *value);
value++;
}
while (padlen < 0) { /* Trailing spaces. */
OUTCHAR(str, *len, size, ' ');
padlen++;
}
}
static void
fmtint(char *str, size_t *len, size_t size, INTMAX_T value, int base, int width,
int precision, int flags)
{
UINTMAX_T uvalue;
char iconvert[MAX_CONVERT_LENGTH];
char sign = 0;
char hexprefix = 0;
int spadlen = 0; /* Amount to space pad. */
int zpadlen = 0; /* Amount to zero pad. */
int pos;
int separators = (flags & PRINT_F_QUOTE);
int noprecision = (precision == -1);
if (flags & PRINT_F_UNSIGNED)
uvalue = value;
else {
uvalue = (value >= 0) ? value : -value;