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strtok() returns temporary string #481174
08/10/20 11:10
08/10/20 11:10
Joined: May 2020
Posts: 20
Germany
M
Morris Offline OP
Newbie
Morris  Offline OP
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M

Joined: May 2020
Posts: 20
Germany
It appears that strtok() returns a temporary string which loses its correct value after several calls. The manual at https://manual.zorro-project.com/str_.htm points this out for other functions, but not for strtok(). Unless I am mistaken here, would you mind updating the manual?

Re: strtok() returns temporary string [Re: Morris] #481176
08/10/20 12:15
08/10/20 12:15
Joined: Feb 2017
Posts: 1,095
Chicago
AndrewAMD Online
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AndrewAMD  Online
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Posts: 1,095
Chicago
Did you feed strtok a temporary string? It's better to use your own buffer.

I believe strtok actually modifies the original string that you supply, adding null terminators and pointing to a specific character in your supplied buffer to get substrings.

Re: strtok() returns temporary string [Re: Morris] #481179
08/10/20 14:31
08/10/20 14:31
Joined: Jul 2000
Posts: 27,343
Frankfurt
jcl Offline

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jcl  Offline

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Joined: Jul 2000
Posts: 27,343
Frankfurt
Yes, strtok modifies the string. It is a standard C function. Temporary strings are only used by specific lite-C string functions.

You can find the documentation about all standard C functions online or in a C book. It's there much more detailed than in the Zorro manual.

Re: strtok() returns temporary string [Re: Morris] #481180
08/10/20 15:31
08/10/20 15:31
Joined: May 2020
Posts: 20
Germany
M
Morris Offline OP
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Morris  Offline OP
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Joined: May 2020
Posts: 20
Germany
Thank you for your quick reply, gentlemen -- Andrew, yes, you are right, I did feed strtok() a temporary string. So it was the underlying temporary string that was modified outside of strtok(). All is well!


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