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FPRINTF(3P) POSIX Programmer's Manual FPRINTF(3P)
PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (con-
sult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on
Linux.
NAME
fprintf, printf, snprintf, sprintf - print formatted output
SYNOPSIS
#include <stdio.h>
int fprintf(FILE *restrict stream, const char *restrict format, ...);
int printf(const char *restrict format, ...);
int snprintf(char *restrict s, size_t n,
const char *restrict format, ...);
int sprintf(char *restrict s, const char *restrict format, ...);
DESCRIPTION
The fprintf() function shall place output on the named output stream. The printf() function shall place output on the
standard output stream stdout. The sprintf() function shall place output followed by the null byte, '\0', in consecutive
bytes starting at *s; it is the user's responsibility to ensure that enough space is available.
The snprintf() function shall be equivalent to sprintf(), with the addition of the n argument which states the size of
the buffer referred to by s. If n is zero, nothing shall be written and s may be a null pointer. Otherwise, output bytes
beyond the n-1st shall be discarded instead of being written to the array, and a null byte is written at the end of the
bytes actually written into the array.
If copying takes place between objects that overlap as a result of a call to sprintf() or snprintf(), the results are
undefined.
Each of these functions converts, formats, and prints its arguments under control of the format. The format is a charac-
ter string, beginning and ending in its initial shift state, if any. The format is composed of zero or more directives:
ordinary characters, which are simply copied to the output stream, and conversion specifications, each of which shall
result in the fetching of zero or more arguments. The results are undefined if there are insufficient arguments for the
format. If the format is exhausted while arguments remain, the excess arguments shall be evaluated but are otherwise
ignored.
Conversions can be applied to the nth argument after the format in the argument list, rather than to the next unused
argument. In this case, the conversion specifier character % (see below) is replaced by the sequence "%n$", where n is a
decimal integer in the range [1,{NL_ARGMAX}], giving the position of the argument in the argument list. This feature pro-
vides for the definition of format strings that select arguments in an order appropriate to specific languages (see the
EXAMPLES section).
The format can contain either numbered argument conversion specifications (that is, "%n$" and "*m$"), or unnumbered argu-
ment conversion specifications (that is, % and * ), but not both. The only exception to this is that %% can be mixed with
the "%n$" form. The results of mixing numbered and unnumbered argument specifications in a format string are undefined.
When numbered argument specifications are used, specifying the Nth argument requires that all the leading arguments, from
the first to the (N-1)th, are specified in the format string.
In format strings containing the "%n$" form of conversion specification, numbered arguments in the argument list can be
referenced from the format string as many times as required.
In format strings containing the % form of conversion specification, each conversion specification uses the first unused
argument in the argument list.
All forms of the fprintf() functions allow for the insertion of a language-dependent radix character in the output
string. The radix character is defined in the program's locale (category LC_NUMERIC ). In the POSIX locale, or in a
locale where the radix character is not defined, the radix character shall default to a period ( '.' ).
Each conversion specification is introduced by the '%' character or by the character sequence "%n$", after which the
following appear in sequence:
* Zero or more flags (in any order), which modify the meaning of the conversion specification.
* An optional minimum field width. If the converted value has fewer bytes than the field width, it shall be padded with
spaces by default on the left; it shall be padded on the right if the left-adjustment flag ( '-' ), described below,
is given to the field width. The field width takes the form of an asterisk ( '*' ), described below, or a decimal
integer.
* An optional precision that gives the minimum number of digits to appear for the d, i, o, u, x, and X conversion speci-
fiers; the number of digits to appear after the radix character for the a, A, e, E, f, and F conversion specifiers;
the maximum number of significant digits for the g and G conversion specifiers; or the maximum number of bytes to be
printed from a string in the s and S conversion specifiers. The precision takes the form of a period ( '.' ) fol-
lowed either by an asterisk ( '*' ), described below, or an optional decimal digit string, where a null digit string
is treated as zero. If a precision appears with any other conversion specifier, the behavior is undefined.
* An optional length modifier that specifies the size of the argument.
* A conversion specifier character that indicates the type of conversion to be applied.
A field width, or precision, or both, may be indicated by an asterisk ( '*' ). In this case an argument of type int sup-
plies the field width or precision. Applications shall ensure that arguments specifying field width, or precision, or
both appear in that order before the argument, if any, to be converted. A negative field width is taken as a '-' flag
followed by a positive field width. A negative precision is taken as if the precision were omitted. In format strings
containing the "%n$" form of a conversion specification, a field width or precision may be indicated by the sequence
"*m$", where m is a decimal integer in the range [1,{NL_ARGMAX}] giving the position in the argument list (after the for-
mat argument) of an integer argument containing the field width or precision, for example:
printf("%1$d:%2$.*3$d:%4$.*3$d\n", hour, min, precision, sec);
The flag characters and their meanings are:
' The integer portion of the result of a decimal conversion ( %i, %d, %u, %f, %F, %g, or %G ) shall be formatted
with thousands' grouping characters. For other conversions the behavior is undefined. The non-monetary grouping
character is used.
- The result of the conversion shall be left-justified within the field. The conversion is right-justified if this
flag is not specified.
+ The result of a signed conversion shall always begin with a sign ( '+' or '-' ). The conversion shall begin with a
sign only when a negative value is converted if this flag is not specified.
<space>
If the first character of a signed conversion is not a sign or if a signed conversion results in no characters, a
<space> shall be prefixed to the result. This means that if the <space> and '+' flags both appear, the <space>
flag shall be ignored.
# Specifies that the value is to be converted to an alternative form. For o conversion, it increases the precision
(if necessary) to force the first digit of the result to be zero. For x or X conversion specifiers, a non-zero
result shall have 0x (or 0X) prefixed to it. For a, A, e, E, f, F, g, and G conversion specifiers, the result
shall always contain a radix character, even if no digits follow the radix character. Without this flag, a radix
character appears in the result of these conversions only if a digit follows it. For g and G conversion speci-
fiers, trailing zeros shall not be removed from the result as they normally are. For other conversion specifiers,
the behavior is undefined.
0 For d, i, o, u, x, X, a, A, e, E, f, F, g, and G conversion specifiers, leading zeros (following any indication of
sign or base) are used to pad to the field width; no space padding is performed. If the '0' and '-' flags both
appear, the '0' flag is ignored. For d, i, o, u, x, and X conversion specifiers, if a precision is specified, the
'0' flag is ignored. If the '0' and '" flags both appear, the grouping characters are inserted before zero pad-
ding. For other conversions, the behavior is undefined.
The length modifiers and their meanings are:
hh Specifies that a following d, i, o, u, x, or X conversion specifier applies to a signed char or unsigned char
argument (the argument will have been promoted according to the integer promotions, but its value shall be con-
verted to signed char or unsigned char before printing); or that a following n conversion specifier applies to a
pointer to a signed char argument.
h Specifies that a following d, i, o, u, x, or X conversion specifier applies to a short or unsigned short argument
(the argument will have been promoted according to the integer promotions, but its value shall be converted to
short or unsigned short before printing); or that a following n conversion specifier applies to a pointer to a
short argument.
l (ell)
Specifies that a following d, i, o, u, x, or X conversion specifier applies to a long or unsigned long argument;
that a following n conversion specifier applies to a pointer to a long argument; that a following c conversion
specifier applies to a wint_t argument; that a following s conversion specifier applies to a pointer to a wchar_t
argument; or has no effect on a following a, A, e, E, f, F, g, or G conversion specifier.
ll (ell-ell)
Specifies that a following d, i, o, u, x, or X conversion specifier applies to a long long or unsigned long long
argument; or that a following n conversion specifier applies to a pointer to a long long argument.
j Specifies that a following d, i, o, u, x, or X conversion specifier applies to an intmax_t or uintmax_t argument;
or that a following n conversion specifier applies to a pointer to an intmax_t argument.
z Specifies that a following d, i, o, u, x, or X conversion specifier applies to a size_t or the corresponding
signed integer type argument; or that a following n conversion specifier applies to a pointer to a signed integer
type corresponding to a size_t argument.
t Specifies that a following d, i, o, u, x, or X conversion specifier applies to a ptrdiff_t or the corresponding
unsigned type argument; or that a following n conversion specifier applies to a pointer to a ptrdiff_t argument.
L Specifies that a following a, A, e, E, f, F, g, or G conversion specifier applies to a long double argument.
If a length modifier appears with any conversion specifier other than as specified above, the behavior is undefined.
The conversion specifiers and their meanings are:
d, i The int argument shall be converted to a signed decimal in the style "[-]dddd". The precision specifies the mini-
mum number of digits to appear; if the value being converted can be represented in fewer digits, it shall be
expanded with leading zeros. The default precision is 1. The result of converting zero with an explicit precision
of zero shall be no characters.
o The unsigned argument shall be converted to unsigned octal format in the style "dddd". The precision specifies the
minimum number of digits to appear; if the value being converted can be represented in fewer digits, it shall be
expanded with leading zeros. The default precision is 1. The result of converting zero with an explicit precision
of zero shall be no characters.
u The unsigned argument shall be converted to unsigned decimal format in the style "dddd". The precision specifies
the minimum number of digits to appear; if the value being converted can be represented in fewer digits, it shall
be expanded with leading zeros. The default precision is 1. The result of converting zero with an explicit preci-
sion of zero shall be no characters.
x The unsigned argument shall be converted to unsigned hexadecimal format in the style "dddd"; the letters "abcdef"
are used. The precision specifies the minimum number of digits to appear; if the value being converted can be rep-
resented in fewer digits, it shall be expanded with leading zeros. The default precision is 1. The result of con-
verting zero with an explicit precision of zero shall be no characters.
X Equivalent to the x conversion specifier, except that letters "ABCDEF" are used instead of "abcdef" .
f, F The double argument shall be converted to decimal notation in the style "[-]ddd.ddd", where the number of digits
after the radix character is equal to the precision specification. If the precision is missing, it shall be taken
as 6; if the precision is explicitly zero and no '#' flag is present, no radix character shall appear. If a radix
character appears, at least one digit appears before it. The low-order digit shall be rounded in an implementa-
tion-defined manner.
A double argument representing an infinity shall be converted in one of the styles "[-]inf" or "[-]infinity" ; which
style is implementation-defined. A double argument representing a NaN shall be converted in one of the styles "[-]nan(n-
char-sequence)" or "[-]nan" ; which style, and the meaning of any n-char-sequence, is implementation-defined. The F con-
version specifier produces "INF", "INFINITY", or "NAN" instead of "inf", "infinity", or "nan", respectively.
e, E The double argument shall be converted in the style "[-]d.ddde+-dd", where there is one digit before the radix
character (which is non-zero if the argument is non-zero) and the number of digits after it is equal to the preci-
sion; if the precision is missing, it shall be taken as 6; if the precision is zero and no '#' flag is present, no
radix character shall appear. The low-order digit shall be rounded in an implementation-defined manner. The E
conversion specifier shall produce a number with 'E' instead of 'e' introducing the exponent. The exponent shall
always contain at least two digits. If the value is zero, the exponent shall be zero.
A double argument representing an infinity or NaN shall be converted in the style of an f or F conversion specifier.
g, G The double argument shall be converted in the style f or e (or in the style F or E in the case of a G conversion
specifier), with the precision specifying the number of significant digits. If an explicit precision is zero, it
shall be taken as 1. The style used depends on the value converted; style e (or E ) shall be used only if the
exponent resulting from such a conversion is less than -4 or greater than or equal to the precision. Trailing
zeros shall be removed from the fractional portion of the result; a radix character shall appear only if it is
followed by a digit or a '#' flag is present.
A double argument representing an infinity or NaN shall be converted in the style of an f or F conversion specifier.
a, A A double argument representing a floating-point number shall be converted in the style "[-]0xh.hhhhp+-d", where
there is one hexadecimal digit (which shall be non-zero if the argument is a normalized floating-point number and
is otherwise unspecified) before the decimal-point character and the number of hexadecimal digits after it is
equal to the precision; if the precision is missing and FLT_RADIX is a power of 2, then the precision shall be
sufficient for an exact representation of the value; if the precision is missing and FLT_RADIX is not a power of
2, then the precision shall be sufficient to distinguish values of type double, except that trailing zeros may be
omitted; if the precision is zero and the '#' flag is not specified, no decimal-point character shall appear. The
letters "abcdef" shall be used for a conversion and the letters "ABCDEF" for A conversion. The A conversion speci-
fier produces a number with 'X' and 'P' instead of 'x' and 'p' . The exponent shall always contain at least one
digit, and only as many more digits as necessary to represent the decimal exponent of 2. If the value is zero,
the exponent shall be zero.
A double argument representing an infinity or NaN shall be converted in the style of an f or F conversion specifier.
c The int argument shall be converted to an unsigned char, and the resulting byte shall be written.
If an l (ell) qualifier is present, the wint_t argument shall be converted as if by an ls conversion specification with
no precision and an argument that points to a two-element array of type wchar_t, the first element of which contains the
wint_t argument to the ls conversion specification and the second element contains a null wide character.
s The argument shall be a pointer to an array of char. Bytes from the array shall be written up to (but not includ-
ing) any terminating null byte. If the precision is specified, no more than that many bytes shall be written. If
the precision is not specified or is greater than the size of the array, the application shall ensure that the
array contains a null byte.
If an l (ell) qualifier is present, the argument shall be a pointer to an array of type wchar_t. Wide characters from the
array shall be converted to characters (each as if by a call to the wcrtomb() function, with the conversion state
described by an mbstate_t object initialized to zero before the first wide character is converted) up to and including a
terminating null wide character. The resulting characters shall be written up to (but not including) the terminating null
character (byte). If no precision is specified, the application shall ensure that the array contains a null wide charac-
ter. If a precision is specified, no more than that many characters (bytes) shall be written (including shift sequences,
if any), and the array shall contain a null wide character if, to equal the character sequence length given by the preci-
sion, the function would need to access a wide character one past the end of the array. In no case shall a partial char-
acter be written.
p The argument shall be a pointer to void. The value of the pointer is converted to a sequence of printable charac-
ters, in an implementation-defined manner.
n The argument shall be a pointer to an integer into which is written the number of bytes written to the output so
far by this call to one of the fprintf() functions. No argument is converted.
C Equivalent to lc .
S Equivalent to ls .
% Print a '%' character; no argument is converted. The complete conversion specification shall be %% .
If a conversion specification does not match one of the above forms, the behavior is undefined. If any argument is not
the correct type for the corresponding conversion specification, the behavior is undefined.
In no case shall a nonexistent or small field width cause truncation of a field; if the result of a conversion is wider
than the field width, the field shall be expanded to contain the conversion result. Characters generated by fprintf() and
printf() are printed as if fputc() had been called.
For the a and A conversion specifiers, if FLT_RADIX is a power of 2, the value shall be correctly rounded to a hexadeci-
mal floating number with the given precision.
For a and A conversions, if FLT_RADIX is not a power of 2 and the result is not exactly representable in the given preci-
sion, the result should be one of the two adjacent numbers in hexadecimal floating style with the given precision, with
the extra stipulation that the error should have a correct sign for the current rounding direction.
For the e, E, f, F, g, and G conversion specifiers, if the number of significant decimal digits is at most DECIMAL_DIG,
then the result should be correctly rounded. If the number of significant decimal digits is more than DECIMAL_DIG but the
source value is exactly representable with DECIMAL_DIG digits, then the result should be an exact representation with
trailing zeros. Otherwise, the source value is bounded by two adjacent decimal strings L < U, both having DECIMAL_DIG
significant digits; the value of the resultant decimal string D should satisfy L <= D <= U, with the extra stipulation
that the error should have a correct sign for the current rounding direction.
The st_ctime and st_mtime fields of the file shall be marked for update between the call to a successful execution of
fprintf() or printf() and the next successful completion of a call to fflush() or fclose() on the same stream or a call
to exit() or abort().
RETURN VALUE
Upon successful completion, the fprintf() and printf() functions shall return the number of bytes transmitted.
Upon successful completion, the sprintf() function shall return the number of bytes written to s, excluding the terminat-
ing null byte.
Upon successful completion, the snprintf() function shall return the number of bytes that would be written to s had n
been sufficiently large excluding the terminating null byte.
If an output error was encountered, these functions shall return a negative value.
If the value of n is zero on a call to snprintf(), nothing shall be written, the number of bytes that would have been
written had n been sufficiently large excluding the terminating null shall be returned, and s may be a null pointer.
ERRORS
For the conditions under which fprintf() and printf() fail and may fail, refer to fputc() or fputwc().
In addition, all forms of fprintf() may fail if:
EILSEQ A wide-character code that does not correspond to a valid character has been detected.
EINVAL There are insufficient arguments.
The printf() and fprintf() functions may fail if:
ENOMEM Insufficient storage space is available.
The snprintf() function shall fail if:
EOVERFLOW
The value of n is greater than {INT_MAX} or the number of bytes needed to hold the output excluding the terminat-
ing null is greater than {INT_MAX}.
The following sections are informative.
EXAMPLES
Printing Language-Independent Date and Time
The following statement can be used to print date and time using a language-independent format:
printf(format, weekday, month, day, hour, min);
For American usage, format could be a pointer to the following string:
"%s, %s %d, %d:%.2d\n"
This example would produce the following message:
Sunday, July 3, 10:02
For German usage, format could be a pointer to the following string:
"%1$s, %3$d. %2$s, %4$d:%5$.2d\n"
This definition of format would produce the following message:
Sonntag, 3. Juli, 10:02
Printing File Information
The following example prints information about the type, permissions, and number of links of a specific file in a direc-
tory.
The first two calls to printf() use data decoded from a previous stat() call. The user-defined strperm() function shall
return a string similar to the one at the beginning of the output for the following command:
ls -l
The next call to printf() outputs the owner's name if it is found using getpwuid(); the getpwuid() function shall return
a passwd structure from which the name of the user is extracted. If the user name is not found, the program instead
prints out the numeric value of the user ID.
The next call prints out the group name if it is found using getgrgid(); getgrgid() is very similar to getpwuid() except
that it shall return group information based on the group number. Once again, if the group is not found, the program
prints the numeric value of the group for the entry.
The final call to printf() prints the size of the file.
#include <stdio.h>
#include <sys/types.h>
#include <pwd.h>
#include <grp.h>
char *strperm (mode_t);
...
struct stat statbuf;
struct passwd *pwd;
struct group *grp;
...
printf("%10.10s", strperm (statbuf.st_mode));
printf("%4d", statbuf.st_nlink);
if ((pwd = getpwuid(statbuf.st_uid)) != NULL)
printf(" %-8.8s", pwd->pw_name);
else
printf(" %-8ld", (long) statbuf.st_uid);
if ((grp = getgrgid(statbuf.st_gid)) != NULL)
printf(" %-8.8s", grp->gr_name);
else
printf(" %-8ld", (long) statbuf.st_gid);
printf("%9jd", (intmax_t) statbuf.st_size);
...
Printing a Localized Date String
The following example gets a localized date string. The nl_langinfo() function shall return the localized date string,
which specifies the order and layout of the date. The strftime() function takes this information and, using the tm struc-
ture for values, places the date and time information into datestring. The printf() function then outputs datestring and
the name of the entry.
#include <stdio.h>
#include <time.h>
#include <langinfo.h>
...
struct dirent *dp;
struct tm *tm;
char datestring[256];
...
strftime(datestring, sizeof(datestring), nl_langinfo (D_T_FMT), tm);
printf(" %s %s\n", datestring, dp->d_name);
...
Printing Error Information
The following example uses fprintf() to write error information to standard error.
In the first group of calls, the program tries to open the password lock file named LOCKFILE. If the file already exists,
this is an error, as indicated by the O_EXCL flag on the open() function. If the call fails, the program assumes that
someone else is updating the password file, and the program exits.
The next group of calls saves a new password file as the current password file by creating a link between LOCKFILE and
the new password file PASSWDFILE.
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#define LOCKFILE "/etc/ptmp"
#define PASSWDFILE "/etc/passwd"
...
int pfd;
...
if ((pfd = open(LOCKFILE, O_WRONLY | O_CREAT | O_EXCL,
S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)) == -1)
{
fprintf(stderr, "Cannot open /etc/ptmp. Try again later.\n");
exit(1);
}
...
if (link(LOCKFILE,PASSWDFILE) == -1) {
fprintf(stderr, "Link error: %s\n", strerror(errno));
exit(1);
}
...
Printing Usage Information
The following example checks to make sure the program has the necessary arguments, and uses fprintf() to print usage
information if the expected number of arguments is not present.
#include <stdio.h>
#include <stdlib.h>
...
char *Options = "hdbtl";
...
if (argc < 2) {
fprintf(stderr, "Usage: %s -%s <file\n", argv[0], Options); exit(1);
}
...
Formatting a Decimal String
The following example prints a key and data pair on stdout. Note use of the '*' (asterisk) in the format string; this
ensures the correct number of decimal places for the element based on the number of elements requested.
#include <stdio.h>
...
long i;
char *keystr;
int elementlen, len;
...
while (len < elementlen) {
...
printf("%s Element%0*ld\n", keystr, elementlen, i);
...
}
Creating a Filename
The following example creates a filename using information from a previous getpwnam() function that returned the HOME
directory of the user.
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
...
char filename[PATH_MAX+1];
struct passwd *pw;
...
sprintf(filename, "%s/%d.out", pw->pw_dir, getpid());
...
Reporting an Event
The following example loops until an event has timed out. The pause() function waits forever unless it receives a signal.
The fprintf() statement should never occur due to the possible return values of pause().
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
...
while (!event_complete) {
...
if (pause() != -1 || errno != EINTR)
fprintf(stderr, "pause: unknown error: %s\n", strerror(errno));
}
...
Printing Monetary Information
The following example uses strfmon() to convert a number and store it as a formatted monetary string named convbuf. If
the first number is printed, the program prints the format and the description; otherwise, it just prints the number.
#include <monetary.h>
#include <stdio.h>
...
struct tblfmt {
char *format;
char *description;
};
struct tblfmt table[] = {
{ "%n", "default formatting" },
{ "%11n", "right align within an 11 character field" },
{ "%#5n", "aligned columns for values up to 99999" },
{ "%=*#5n", "specify a fill character" },
{ "%=0#5n", "fill characters do not use grouping" },
{ "%^#5n", "disable the grouping separator" },
{ "%^#5.0n", "round off to whole units" },
{ "%^#5.4n", "increase the precision" },
{ "%(#5n", "use an alternative pos/neg style" },
{ "%!(#5n", "disable the currency symbol" },
};
...
float input[3];
int i, j;
char convbuf[100];
...
strfmon(convbuf, sizeof(convbuf), table[i].format, input[j]);
if (j == 0) {
printf("%s %s %s\n", table[i].format,
convbuf, table[i].description);
}
else {
printf(" %s\n", convbuf);
}
...
Printing Wide Characters
The following example prints a series of wide characters. Suppose that "L`@`" expands to three bytes:
wchar_t wz [3] = L"@@"; // Zero-terminated
wchar_t wn [3] = L"@@@"; // Unterminated
fprintf (stdout,"%ls", wz); // Outputs 6 bytes
fprintf (stdout,"%ls", wn); // Undefined because wn has no terminator
fprintf (stdout,"%4ls", wz); // Outputs 3 bytes
fprintf (stdout,"%4ls", wn); // Outputs 3 bytes; no terminator needed
fprintf (stdout,"%9ls", wz); // Outputs 6 bytes
fprintf (stdout,"%9ls", wn); // Outputs 9 bytes; no terminator needed
fprintf (stdout,"%10ls", wz); // Outputs 6 bytes
fprintf (stdout,"%10ls", wn); // Undefined because wn has no terminator
In the last line of the example, after processing three characters, nine bytes have been output. The fourth character
must then be examined to determine whether it converts to one byte or more. If it converts to more than one byte, the
output is only nine bytes. Since there is no fourth character in the array, the behavior is undefined.
APPLICATION USAGE
If the application calling fprintf() has any objects of type wint_t or wchar_t, it must also include the <wchar.h> header
to have these objects defined.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
fputc(), fscanf(), setlocale(), strfmon(), wcrtomb(), the Base Definitions volume of IEEE Std 1003.1-2001, Chapter 7,
Locale, <stdio.h>, <wchar.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for
Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copy-
right (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any
discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group
Standard is the referee document. The original Standard can be obtained online at http://www.open-
group.org/unix/online.html .
IEEE/The Open Group 2003 FPRINTF(3P)
