I am using a string to look for fromat specifiers (similar to how printf does). when I find one, I want to re-use the string without exiting the function. How do I reset the string, discarding what has already been stored in it. I have tried writing a null to the first place in the string but all I get are core dumps. Any help is appreciated.
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A core dump will probably occur if you try to write to a string constant. String constants are usually stored in read only memory.
i.e.
The following code *may* result in a core dump:
char *fmt = "%s junk %d more junk";
fmt[2] = '\0';
because the compiler *may* store the string in read only memory.
If you are using a string constant try changing it to this:
char fmt[100];
strcpy(fmt,"%s junk %d more junk");
fmt[2] = '\0';
Just to see if that stops the core dumps.
Regards
Paul
Business Accounts
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by: mnashadkaPosted on 2003-04-15 at 20:31:27ID: 8338294
If by string you mean char *, you can either memset it back to 0 (memset(mystring, 0, mystring_length);) or just strcpy the empty string back into it (strcpy(mystring, "");). Keep in mind that the strcpy will reset the first couple of characters, but if there are any characters past the null terminator they may not be overwritten. The first way (memset) will reset the whole thing, which is probably a safer bet depending upon what you're actually doing.
If you mean string (which would be C++), just set it equal to "" (e.g. str = "";).
Good luck!