On Sun, Mar 17, 2019 at 09:23:23PM -0400, Jerry Geis wrote:
> I am trying to use the fnmatch() function in a C program and pass as the
> 3rd arg (options) of case insensitive search...
>
> When I use the value FNM_CASEFOLD it does not work...
>
> I'm confused on what to send to fnmatch() to do a case insensitive search.
>
> Any pointers ? Thanks.
Depends on what you mean by "doesn't work". If you mean that you
get a compile-time error:
cc -o foo foo.c
foo.c: In function \u2018main\u2019:
foo.c:20:35: error: \u2018FNM_CASEFOLD\u2019 undeclared (first use in this function)
ret = fnmatch (argv[1], argv[2], FNM_CASEFOLD);
^
foo.c:20:35: note: each undeclared identifier is reported only once for each function it appears in
that's what I get too. The man page doesn't say anything about special
requirements to use that function, but if you go look at fnmatch.h,
you'll find:
#if !defined _POSIX_C_SOURCE || _POSIX_C_SOURCE < 2 || defined _GNU_SOURCE
# define FNM_FILE_NAME FNM_PATHNAME /* Preferred GNU name. */
# define FNM_LEADING_DIR (1 << 3) /* Ignore `/...' after a match. */
# define FNM_CASEFOLD (1 << 4) /* Compare without regard to case. */
# define FNM_EXTMATCH (1 << 5) /* Use ksh-like extended matching. */
#endif
which indicates that those values aren't available UNLESS your program
has defines matching the first line shown. I haven't bothered to check
for the value of _POSIX_C_SOURCE in the absence of commandline options
that change the GCC default behavior, but just defining _GNU_SOURCE
is enough to make it compile:
[fredex@fcshome tmp]$ cc -o foo foo.c
[fredex@fcshome tmp]$
foo.c:
#include <stdio.h>
#include <stdlib.h>
#define _GNU_SOURCE
#include <fnmatch.h>
int main (int argc, char ** argv)
{
int ret = 0;
if (argc != 3)
{
printf ("Oops. please specify two strings to compare\n");
exit (0);
}
ret = fnmatch (argv[1], argv[2], FNM_CASEFOLD);
printf ("fnmatch %s, %s returned %d\n", argv[1], argv[2], ret);
return 0;
}
and running it results in:
$ ./foo abc abc
fnmatch abc, abc returned 0
$ ./foo abc aBc
fnmatch abc, aBc returned 0
$ ./foo abc aBcz
fnmatch abc, aBcz returned 1
--
-------------------------------------------------------------------------------
.---- Fred Smith /
( /__ ,__. __ __ / __ : /
/ / / /__) / / /__) .+' Home: fredex@xxxxxxxxxxxxxxxxxxxxxx
/ / (__ (___ (__(_ (___ / :__ 781-438-5471
-------------------------------- Jude 1:24,25 ---------------------------------
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