473,326 Members | 2,099 Online
Bytes | Software Development & Data Engineering Community
Post Job

Home Posts Topics Members FAQ

Join Bytes to post your question to a community of 473,326 software developers and data experts.

printf

Hi,

Where can I find the source for printf ?

John
Nov 14 '05 #1
8 4956
Hi John,

Your best bet is to download libc and grab the source from there.
However, I'm willing to bet it's fairly complex and not so trivial.
-Adam Roan

Nov 14 '05 #2
"Johan" <me@knoware.nl> writes:
Where can I find the source for printf ?


Whose version of printf()?
--
"I don't have C&V for that handy, but I've got Dan Pop."
--E. Gibbons
Nov 14 '05 #3
Johan wrote:
Hi,

Where can I find the source for printf ?


You can find a rudimentary implementation on p156 of
K&R2. Admittedly it calls the real printf to do much of the
work, but there's enough there to give you the essence.

Or you could get a copy of the GNU library source.

Here's the source provided by Microsoft:

int __cdecl printf (
const char *format,
...
)
/*
* stdout 'PRINT', 'F'ormatted
*/
{
va_list arglist;
int buffing;
int retval;

va_start(arglist, format);

_ASSERTE(format != NULL);

_lock_str2(1, stdout);

buffing = _stbuf(stdout);

retval = _output(stdout,format,arglist);

_ftbuf(buffing, stdout);

_unlock_str2(1, stdout);

return(retval);
}

Not much help, is it?
Nov 14 '05 #4
"Johan" <me@knoware.nl> wrote:
Where can I find the source for printf ?


That depends on what you need it for. If you want the source for _a_
version of printf(), at least one, probably several, are available on
the web. Of course, they're likely to be pretty much implementation-
specific, so they might be useless with your compiler. If you want the
source for _your_ version of printf(), you'll have to ask your vendor.

Richard
Nov 14 '05 #5
Somewhat related to the FAQ:

18.13: Where can I find the sources of the standard C libraries?

A: The GNU project has a complete implementation at
http://www.gnu.org/software/libc/. Another source (though not
public domain) is _The Standard C Library_, by P.J. Plauger (see
the Bibliography). See also questions 18.9b, 18.15c, and 18.16.

Many C compilers come with the runtime source for their own
implementation of the standard C libraries.

Nov 14 '05 #6
"Johan" <me@knoware.nl> writes:
Where can I find the source for printf ?


I wrote a simple implementation that should be reasonably
portable for Pintos, my instructional operating system. It does
not support floating-point formatting, it has a few limitations
that are probably not entirely standard compliant, and its code
is not entirely comp.lang.c compliant. Given those constraints,
you are welcome to take a look at it. It is in file
pintos/src/lib/stdio.c in the tar archive available at
http://www.stanford.edu/class/cs140/.../pintos.tar.gz
--
"If I've told you once, I've told you LLONG_MAX times not to
exaggerate."
--Jack Klein
Nov 14 '05 #7
Sorry for my oxmoron. Sigh. :P

Nov 14 '05 #8
Ben Pfaff <bl*@cs.stanford.edu> writes:
"Johan" <me@knoware.nl> writes:
Where can I find the source for printf ?


I wrote a simple implementation that should be reasonably
portable for Pintos, my instructional operating system. It does
not support floating-point formatting, it has a few limitations
that are probably not entirely standard compliant, and its code
is not entirely comp.lang.c compliant. Given those constraints,
you are welcome to take a look at it. It is in file
pintos/src/lib/stdio.c in the tar archive available at
http://www.stanford.edu/class/cs140/.../pintos.tar.gz


Come to think of it, I can even provide a direct link:
http://www.stanford.edu/class/cs140/...rc/lib/stdio.c
--
Ben Pfaff
email: bl*@cs.stanford.edu
web: http://benpfaff.org
Nov 14 '05 #9

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

11
by: Grumble | last post by:
Hello, I have the following structure: struct foo { char *format; /* format string to be used with printf() */ int nparm; /* number of %d specifiers in the format string */ /* 0 <= nparm <=...
8
by: aditya | last post by:
hi, Can anybody please tell me that how the following printf(...) statement works- main(){ int d=9; printf("%d",printf("%d")); return 0;
7
by: teachtiro | last post by:
Hi, 'C' says \ is the escape character to be used when characters are to be interpreted in an uncommon sense, e.g. \t usage in printf(), but for printing % through printf(), i have read that %%...
188
by: infobahn | last post by:
printf("%p\n", (void *)0); /* UB, or not? Please explain your answer. */
29
by: whatluo | last post by:
Hi, c.l.cs I noticed that someone like add (void) before the printf call, like: (void) printf("Timeout\n"); while the others does't. So can someone tell me whether there any gains in adding...
4
by: pai | last post by:
Hi , Can any one tell me how this statement of printf is behaving . how the last digit is printed int a=2,b=4,c=7; printf("%d",printf("%d %d:",a,b)); //answer to this was 2 4:3
11
by: timmu | last post by:
Someone asked me a question about integer division and printf yesterday, I tell him he should do a casting to float/double before you do any interger division. But he doesn't think so, so I try...
19
by: RedDevilDan | last post by:
I am working on a Memory Footprint Reduction project. I came across an idea to disable all printf statements so that less memory is required. In addition, when there is no single printf statement,...
34
by: Old Wolf | last post by:
Is there any possible situation for printf where %hd causes a different result to %d, and the corresponding argument was of type 'short int' ?
1
by: linq936 | last post by:
Hi, I read in many places that the string to be outputted by printf() must be ending with newline, for example, it should be printf("Hello World.\n"); instead of printf("Hello World.");
0
by: ryjfgjl | last post by:
ExcelToDatabase: batch import excel into database automatically...
0
isladogs
by: isladogs | last post by:
The next Access Europe meeting will be on Wednesday 6 Mar 2024 starting at 18:00 UK time (6PM UTC) and finishing at about 19:15 (7.15PM). In this month's session, we are pleased to welcome back...
1
isladogs
by: isladogs | last post by:
The next Access Europe meeting will be on Wednesday 6 Mar 2024 starting at 18:00 UK time (6PM UTC) and finishing at about 19:15 (7.15PM). In this month's session, we are pleased to welcome back...
0
by: Vimpel783 | last post by:
Hello! Guys, I found this code on the Internet, but I need to modify it a little. It works well, the problem is this: Data is sent from only one cell, in this case B5, but it is necessary that data...
0
by: jfyes | last post by:
As a hardware engineer, after seeing that CEIWEI recently released a new tool for Modbus RTU Over TCP/UDP filtering and monitoring, I actively went to its official website to take a look. It turned...
0
by: ArrayDB | last post by:
The error message I've encountered is; ERROR:root:Error generating model response: exception: access violation writing 0x0000000000005140, which seems to be indicative of an access violation...
1
by: CloudSolutions | last post by:
Introduction: For many beginners and individual users, requiring a credit card and email registration may pose a barrier when starting to use cloud servers. However, some cloud server providers now...
0
by: af34tf | last post by:
Hi Guys, I have a domain whose name is BytesLimited.com, and I want to sell it. Does anyone know about platforms that allow me to list my domain in auction for free. Thank you
0
by: Faith0G | last post by:
I am starting a new it consulting business and it's been a while since I setup a new website. Is wordpress still the best web based software for hosting a 5 page website? The webpages will be...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.