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Full Discussion: strcmp core dumps
Top Forums Programming strcmp core dumps Post 99936 by jim mcnamara on Wednesday 22nd of February 2006 10:54:54 AM
Old 02-22-2006
Barfing on a NULL pointer is actually the desired behavior.

Merely having a zero length string won't be a problem for strcmp. The mian cause for this is that you are missing the "trailing" nul character in a string.

If the strcmp occurs in the function where a and b are declared otherwise pass in sizoef(a) and sizeof(b) as arguments:
Code:
#define BARADRG -256
/* strcmp -- strncmp can't return a minus 256 */
if(a!=NULL && b!=NULL)
{
      result=strncmp(a,b, ( sizeof(a)>sizeof(b) )? sizeof(a):sizeof(b));
}
else
      result=BADARG;
}

 

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LEARN ABOUT OPENDARWIN

strcmp

STRCMP(3)						     Linux Programmer's Manual							 STRCMP(3)

NAME

       strcmp, strncmp - compare two strings

SYNOPSIS

       #include <string.h>

       int strcmp(const char *s1, const char *s2);

       int strncmp(const char *s1, const char *s2, size_t n);

DESCRIPTION

       The  strcmp() function compares the two strings s1 and s2.  It returns an integer less than, equal to, or greater than zero if s1 is found,
       respectively, to be less than, to match, or be greater than s2.

       The strncmp() function is similar, except it compares only the first (at most) n bytes of s1 and s2.

RETURN VALUE

       The strcmp() and strncmp() functions return an integer less than, equal to, or greater than zero if s1 (or the first n  bytes  thereof)	is
       found, respectively, to be less than, to match, or be greater than s2.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       +--------------------+---------------+---------+
       |Interface	    | Attribute     | Value   |
       +--------------------+---------------+---------+
       |strcmp(), strncmp() | Thread safety | MT-Safe |
       +--------------------+---------------+---------+
CONFORMING TO

       POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD.

SEE ALSO

       bcmp(3), memcmp(3), strcasecmp(3), strcoll(3), string(3), strncasecmp(3), strverscmp(3), wcscmp(3), wcsncmp(3)

COLOPHON

       This  page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

								    2015-08-08								 STRCMP(3)
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