Hi.
sscanf(text, "%s %s", name, company);
parses 'ian mceknis' but it also parses 'ian mceknis' and so on. How can i make this to parse only the first one? It must contain only one space not more.
Thank you.
views:
106answers:
3
+2
A:
If you want it to reject the latter example, you'll have to roll your own function to find/reject multiple spaces.
But my guess is that what you really want to do is strip the extra spaces. See: http://stackoverflow.com/questions/122616/painless-way-to-trim-leading-trailing-whitespace-in-c
Wayne Werner
2010-05-24 15:18:59
Yeah but still the string would be parse-able. This is why i can't do that.
jamall55
2010-05-24 15:38:51
Then you'll absolutely have to roll your own pre-check for a double space. What about whitespace before your string? Is that allowed? What about two spaces at the end? Also, is this a homework problem? Because from a usability standpoint it's usually less desirable to restrict input options.
Wayne Werner
2010-05-24 19:30:48
A:
You can't do this using only sscanf(), which has pretty basic functionality. If you really need to enforce this (do you?), regular expressions might be more suitable here.
j_random_hacker
2010-05-24 15:19:25
A:
According to sscanf definition, this is absolutely impossible. To get desired result, I would read the text variable manually, searching for two consequent whitespace characters. If found, replace the second whitespace character with 0 and then call sscanf.
Alex Farber
2010-05-24 15:24:15
Replacing the second whitespace character with '0' will just cause `company` to be set to `0mceknis` in the example given. -1.
j_random_hacker
2010-05-24 15:32:58
I wondered if you meant 0 as in the nul character (all-bits-off). In the example given, that will terminate the string before `mceknis` (i.e. the input string is now `ian ` with a single space at the end) so `sscanf()` will fail.
j_random_hacker
2010-05-25 10:32:34