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#include <getopt.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#define BASENAME_OUT_FMT "%s\n"
#define BASENAME_USAGE "Usage: basename NAME [SUFFIX]\n"
#define BASENAME_USE "Return non-directory portion of a pathname\n"
static char *remove_trailing_slashes(char *pathname) {
size_t j = strlen(pathname);
char *last_char = pathname + j - 1;
for (;last_char > pathname; last_char--) {
if (*last_char != '/') {
break;
}
*last_char = '\0';
}
return last_char;
}
int basename_main(int argc, char *argv[]) {
char *result = NULL;
char *suffix = NULL;
char *last_slash = NULL;
char *last_char = NULL;
char *suffix_end = NULL;
bool suffix_match = true;
size_t suffix_len = 0;
char *cursor = NULL;
if (getopt(argc, argv, "") != -1) {
fprintf(stderr, BASENAME_USAGE);
return EXIT_FAILURE;
}
if (argc < 2 || argc > 3) {
fprintf(stderr, "%s%s", BASENAME_USAGE, BASENAME_USE);
return EXIT_FAILURE;
}
result = argv[1];
suffix = argc == 3 ? argv[2] : NULL;
/* Return "" on empty input string */
if (result[0] == '\0') {
printf(BASENAME_OUT_FMT, "");
return EXIT_SUCCESS;
}
/* Remove trailing whitespace and return "/" if the path was all slashes */
last_char = remove_trailing_slashes(result);
if (last_char == result) {
printf(BASENAME_OUT_FMT, "/");
return EXIT_SUCCESS;
}
/* Keep only the last node */
last_slash = strrchr(result, '/');
result = last_slash == NULL ? result : last_slash + 1;
/* Remove suffix or return it as is if it's equal to last_node */
if (suffix == NULL) {
printf(BASENAME_OUT_FMT, result);
return EXIT_SUCCESS;
}
suffix_len = strlen(suffix);
if (suffix_len > strlen(result)) {
printf(BASENAME_OUT_FMT, result);
return EXIT_SUCCESS;
}
cursor = last_char;
for (suffix_end = suffix + suffix_len - 1; suffix_end > suffix; suffix_end--) {
if (*cursor != *suffix_end) {
suffix_match = false;
break;
}
cursor--;
}
if (suffix_match && cursor != result) {
*cursor = '\0';
}
printf(BASENAME_OUT_FMT, result);
return EXIT_SUCCESS;
}
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