C FAQ Q 13.2 says that sprintf() is guaranteed to work only for n <= 509:
sprintf(dest, "%.*s", n, source);
Does 509 appear in any C standard? If not, where it came from?
I looked over C99 (ISO/IEC 9899:1999) but didn't find yet.
If that limitation is old standard (perhaps ANSI?), does it limit the total
length of the string that sprintf() would print, or just for one '%s'?
I heard that on some old system does have a limitation on the total output
length of printf() family. If this limitation is not covered by (any) C
standard,
where can I get the information? (perhaps POSIX?)
Thanx.
--
C FAQ: http://www.eskimo.com/~scs/C-faq/top.html
Korean Ver: http://www.cinsk.org/cfaqs/ 3  14655 
"Seong-Kook Shin" <ci********@sam sung.com> wrote in message
news:ct******** **@news1.kornet .net... C FAQ Q 13.2 says that sprintf() is guaranteed to work only for n <= 509:
That's funny, I see that Q 13.2 is about 'strncpy()' function.
sprintf(dest, "%.*s", n, source);
Does 509 appear in any C standard? If not, where it came from?
I looked over C99 (ISO/IEC 9899:1999) but didn't find yet.
If that limitation is old standard (perhaps ANSI?), does it limit the
total length of the string that sprintf() would print, or just for one '%s'?
I heard that on some old system does have a limitation on the total output
length of printf() family. If this limitation is not covered by (any) C
standard,
where can I get the information? (perhaps POSIX?)
From the 1999 standard:
--------------------------------------------------------------
7.19.6.1 The fprintf function
Returns
14 The fprintf function returns the number of characters
transmitted, or a negative value if an output or encoding
error occurred.
Environmental limits
15 The number of characters that can be produced by any single
conversion shall be at least 4095.
--------------------------------------------------------------
From the 1989 standard:
--------------------------------------------------------------
4.9.6.1 The fprintf function
Returns
The fprintf function returns the number of characters transmitted,
or a negative value if an output error occurred.
"Environmen tal limit"
The minimum value for the maximum number of characters produced by
any single conversion shall be 509.
--------------------------------------------------------------
-Mike
"Mike Wahler" <mk******@mkwah ler.net> wrote in message
news:uJ******** *********@newsr ead1.news.pas.e arthlink.net... From the 1999 standard:
--------------------------------------------------------------
7.19.6.1 The fprintf function
-Mike
Anticipating a possible objection that you asked about 'sprintf()'
rather than 'fprintf()':
7.19.6.6 The sprintf function
Description
2 The sprintf function is equivalent to fprintf, except that the
output is written into an array (specified by the argument s)
rather than to a stream. A null character is written at the end
of the characters written; it is not counted as part of the
returned value. If copying takes place between objects that
overlap, the behavior is undefined.
Returns
3 The sprintf function returns the number of characters written in
the array, not counting the terminating null character, or a neg-
ative value if an encoding error occurred.
-Mike
Mike Wahler wrote:
"Seong-Kook Shin" <ci********@sam sung.com> wrote in message
news:ct******** **@news1.kornet .net... C FAQ Q 13.2 says that sprintf()
is guaranteed to work only for n <= 509:
That's funny, I see that Q 13.2 is about 'strncpy()'
function.
sprintf(dest, "%.*s", n, source);
Does 509 appear in any C standard? If not, where it came from?
I looked over C99 (ISO/IEC 9899:1999) but didn't find yet.
If that limitation is old standard (perhaps ANSI?),
does it limit the total
length of the string that sprintf() would print,
or just for one '%s'?
I heard that on some old system does have
a limitation on the total output
length of printf() family. If this limitation
is not covered by (any) C
standard,
where can I get the information? (perhaps POSIX?)
From the 1999 standard:
--------------------------------------------------------------
7.19.6.1 The fprintf function
Returns
14 The fprintf function returns the number of characters
transmitted, or a negative value if an output or encoding
error occurred.
Environmental limits
15 The number of characters that can be produced by any single
conversion shall be at least 4095.
--------------------------------------------------------------
From the 1989 standard:
--------------------------------------------------------------
4.9.6.1 The fprintf function
Returns
The fprintf function returns the number of characters transmitted,
or a negative value if an output error occurred.
"Environmen tal limit"
The minimum value for the maximum number of characters produced by
any single conversion shall be 509.
--------------------------------------------------------------
There's also an environmental limit on line length.
N869
7.19.2 Streams
Environmental limits
[#7] An implementation shall support text files with lines
containing at least 254 characters, including the
terminating new-line character.
--
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