basename.c

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#include <sys/types.h>
#include <stdio.h>
#include <stddef.h>
#include <string.h>
#include <limits.h>
#include <libgen.h>

char *basename(char *s)
{
        static char ret[PATH_MAX];
        int i;
        enum {
                INIT,
                NAME,
                SEP,
        } state;

        i = strlen(s) - 1;
        state = INIT;
        while (i >= 0) {
                switch (s[i]) {
                case '\0':
                case '/':
                        if (state == NAME) {
                                int j;
                                while (s[i] && s[i] == '/') {
                                        i++;
                                }

                                j = 0;
                                while (s[i] && s[i] != '/') {
                                        ret[j++] = s[i++];
                                }

                                if (j) {
                                        ret[j] = '\0';
                                } else {
                                        strcpy(ret, s);
                                }

                                return ret;
                        }
                        state = SEP;
                        break;
                default:
                        state = NAME;
                        break;
                }

                i--;
        }

        strcpy(ret, s);
        return ret;
}

/* End of a file */