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Format string as a parameter to printf()?
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Timur Ta
#1 / 6
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 Format string as a parameter to printf()? I have a string constant like this:
static char SZ_CUR_BOOT[] = "The Firmware is currently booting from
the %s side.";
Normally, if I wanted to output this string as HTML, I'd do something
like this:
printf("<p>");
printf(SZ_CUR_BOOT, "left");
printf("</p>");
Which would output this text:
"<p>The Firmware is currently booting from the left side.</p>"
Is there anyway to combined the above three printf() calls into a
SINGLE printf() call, without modifying the contents of SZ_CUR_BOOT?
Something like this:
interpret the next parameter as a format string.
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| Sat, 13 Aug 2005 06:26:01 GMT |
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Ben Pfaf
#2 / 6
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Format string as a parameter to printf()? Quote:
> I have a string constant like this: > static char SZ_CUR_BOOT[] = "The Firmware is currently booting from
> the %s side.";
> Normally, if I wanted to output this string as HTML, I'd do something
> like this:
> printf("<p>");
> printf(SZ_CUR_BOOT, "left");
> printf("</p>");
> Which would output this text:
> "<p>The Firmware is currently booting from the left side.</p>"
> Is there anyway to combined the above three printf() calls into a
> SINGLE printf() call, without modifying the contents of SZ_CUR_BOOT?
No. However, if you change the string constant to a macro, like
this:
#define SZ_CUR_BOOT "The Firmware is currently booting from the %s side."
then you can use the string concatenation feature of C, like so:
printf("<p>" SZ_CUR_BOOT "</p>", "left");
--
"It wouldn't be a new C standard if it didn't give a
new meaning to the word `static'."
--Peter Seebach on C99
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| Sat, 13 Aug 2005 06:34:31 GMT |
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Joona I Palast
#3 / 6
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Format string as a parameter to printf()?
Quote: > I have a string constant like this: > static char SZ_CUR_BOOT[] = "The Firmware is currently booting from > the %s side."; > Normally, if I wanted to output this string as HTML, I'd do something > like this: > printf("<p>"); > printf(SZ_CUR_BOOT, "left"); > printf("</p>"); > Which would output this text: > "<p>The Firmware is currently booting from the left side.</p>" > Is there anyway to combined the above three printf() calls into a > SINGLE printf() call, without modifying the contents of SZ_CUR_BOOT? > Something like this:
> interpret the next parameter as a format string.
printf call. What you need is sprintf.
char buffer[BIG_ENOUGH];
sprintf(buffer, "<p>%s</p>", SZ_CUR_BOOT);
printf(buffer, "left");
--
| Kingpriest of "The Flying Lemon Tree" G++ FR FW+ M- #108 D+ ADA N+++|
| http://www.helsinki.fi/~palaste W++ B OP+ |
\----------------------------------------- Finland rules! ------------/
"Ice cream sales somehow cause drownings: both happen in summer."
- Antti Voipio & Arto Wikla
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| Sat, 13 Aug 2005 06:40:32 GMT |
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Martin Ambuh
#4 / 6
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Format string as a parameter to printf()? Quote:
> I have a string constant like this: > static char SZ_CUR_BOOT[] = "The Firmware is currently booting from
> the %s side.";
> Normally, if I wanted to output this string as HTML, I'd do something
> like this:
> printf("<p>");
> printf(SZ_CUR_BOOT, "left");
> printf("</p>");
> Which would output this text:
> "<p>The Firmware is currently booting from the left side.</p>"
> Is there anyway to combined the above three printf() calls into a
> SINGLE printf() call, without modifying the contents of SZ_CUR_BOOT?
printf("<p>" SZ_CUR_BOOT "</p>", "left");
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| Sat, 13 Aug 2005 14:23:45 GMT |
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Ben Pfaf
#5 / 6
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Format string as a parameter to printf()? Quote:
> > I have a string constant like this: > > static char SZ_CUR_BOOT[] = "The Firmware is currently booting from > > the %s side."; > printf("<p>" SZ_CUR_BOOT "</p>", "left");
No, that syntax only works with string literals.
--
"IMO, Perl is an excellent language to break your teeth on"
--Micah Cowan
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| Sat, 13 Aug 2005 17:08:10 GMT |
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Mark Gordo
#6 / 6
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Format string as a parameter to printf()? On Tue, 25 Feb 2003 06:23:45 GMT
Quote:
> > I have a string constant like this: > > static char SZ_CUR_BOOT[] = "The Firmware is currently booting from
> > the %s side.";
> > Normally, if I wanted to output this string as HTML, I'd do
> > something like this:
> > printf("<p>");
> > printf(SZ_CUR_BOOT, "left");
> > printf("</p>");
> > Which would output this text:
> > "<p>The Firmware is currently booting from the left side.</p>"
> > Is there anyway to combined the above three printf() calls into a
> > SINGLE printf() call, without modifying the contents of SZ_CUR_BOOT?
> printf("<p>" SZ_CUR_BOOT "</p>", "left");
That won't work. SZ_CUR_BOOT is an array of char, not a macro that
expands to a literal string.
--
Mark Gordon
Paid to be a Geek & a Senior Software Developer
Currently looking for a new job commutable from Slough, Berks, U.K.
Although my email address says spamtrap, it is real and I read it.
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| Sat, 13 Aug 2005 17:53:54 GMT |
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