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#define _POSIX_C_SOURCE 2
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
char *g_name = "basename";
void fatal(char *message)
{
fprintf(stderr, "%s: %s\n", g_name, message);
exit(EXIT_FAILURE);
}
char *truncate_path(char *s, char *suffix)
{
if (*s == '\0')
return s;
size_t last = strlen(s) - 1;
while (s[last] == '/' && last != 0)
{
s[last] = '\0';
last--;
}
char *last_slash = strrchr(s, '/');
if (last_slash != NULL && last_slash != s)
s = last_slash + 1;
if (suffix != NULL)
{
char *end = s + strlen(s) - strlen(suffix);
if (end > s && strcmp(end, suffix) == 0)
*end = '\0';
}
return s;
}
int main(int argc, char **argv)
{
int option;
char *suffix = NULL;
bool multiple = false;
char line_delim = '\n';
g_name = argv[0];
while ((option = getopt(argc, argv, "as:z")) != -1)
{
switch (option)
{
case 's':
suffix = optarg;
case 'a':
multiple = true;
break;
case 'z':
line_delim = '\0';
break;
default:
return EXIT_FAILURE;
}
}
if (optind == argc)
fatal("missing operand");
if (!multiple)
{
argv[optind] = truncate_path(argv[optind], argv[optind + 1]);
fputs(argv[optind], stdout);
putchar(line_delim);
return EXIT_SUCCESS;
}
for (; optind < argc; optind++)
{
argv[optind] = truncate_path(argv[optind], suffix);
fputs(argv[optind], stdout);
putchar(line_delim);
}
return EXIT_SUCCESS;
}
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