I would adjust things so that you're just sorting a simple array, in this case of pointers to char - qsort
will arrange for you to get pointers to two elements in that array (that is, char **
pointers), and some basic dereferencing is needed to get you to the "pointers to char" comparable via strcasecmp
. @Mark likely has sussed out the source of the 260 in your unseen calling code, but I'm not a big fan of those kinds of 2d arrays in C.
The following functions for me, with an example main() to exercise it.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int compare(const void *v1, const void *v2){
char *a = *(char **)v1;
char *b = *(char **)v2;
printf("comparing %s to %s\n", a, b);
return strcasecmp(a,b);
}
void sortListName(char **fileList, int noOfFiles){
printf("Sorting\n");
qsort(fileList, noOfFiles, sizeof(*fileList), compare);
return;
}
int
main(void)
{
char *filenames[] = {
"/var/www/icons/comp.gray.png",
"/var/www/error/HTTP_SERVICE_UNAVAILABLE.html.var",
"/var/www/icons/right.gif",
"/var/www/error/HTTP_NOT_IMPLEMENTED.html.var",
"/var/www/icons/pie3.png",
"/var/www/icons/pie2.png",
"/var/www/htdocs/manual/mod/mod_proxy_balancer.html",
"/var/www/htdocs/manual/programs/rotatelogs.html",
"/var/www/htdocs/manual/vhosts/mass.html",
"/var/www/icons/movie.png",
"/var/www/htdocs/manual/images/caching_fig1.png",
"/var/www/htdocs/htdig/search.html",
"/var/www/icons/generic.gif",
"/var/www/htdocs/manual/mod/quickreference.html",
"/var/www/icons/small/blank.png",
"/var/www/icons/image2.gif"
};
int i, nf = (int) (sizeof(filenames) / sizeof(filenames[0]));
puts("Unsorted:");
for (i = 0; i < nf; i++) {
puts(filenames[i]);
}
sortListName(filenames, nf);
puts("Sorted:");
for (i = 0; i < nf; i++) {
puts(filenames[i]);
}
return 0;
}