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Full Discussion: basename and dirname changes the value of argument???
Top Forums Programming basename and dirname changes the value of argument??? Post 302336506 by pludi on Wednesday 22nd of July 2009 09:19:23 AM
Old 07-22-2009
From the man-page:
Code:
       Both dirname() and basename() may modify the contents of  path,  so  it
       may be desirable to pass a copy when calling one of these functions.

       These  functions  may  return  pointers  to statically allocated memory
       which may be overwritten by subsequent calls.  Alternatively, they  may
       return  a  pointer to some part of path, so that the string referred to
       by path should not be modified or freed until the pointer  returned  by
       the function is no longer required.

Meaning: SUSv2 only defined that the functions should return a pointer to a character array, but it doesn't define whether that pointer might be overwritten if the argument passed may be changed or not, but leaves that to the implementation.

You could change your code using malloc(), so that you wouldn't have to allocate memory statically but only if needed.
 

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LEARN ABOUT CENTOS

libgen.h

libgen.h(3HEAD)                                                       Headers                                                      libgen.h(3HEAD)

NAME

       libgen.h, libgen - definitions for pattern matching functions

SYNOPSIS

       #include <libgen.h>

DESCRIPTION

       The <libgen.h> header lists definitions used for string pattern-matching and pathname manipulation. See libgen(3LIB).

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Interface Stability          |Standard                     |
       +-----------------------------+-----------------------------+

SEE ALSO

       basename(3C), dirname(3C), libgen(3LIB), attributes(5), standards(5)

SunOS 5.10                                                          10 Sep 2004                                                    libgen.h(3HEAD)
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