Test dirname wrapper

test-dirname.c

#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <libgen.h>

#define mutt_array_size(x) (sizeof(x) / sizeof((x)[0]))

void *mutt_mem_malloc(size_t size)
{
  void *p = NULL;

  if (size == 0)
    return NULL;
  p = malloc(size);
  if (!p)
    exit(1);
  return p;
}

char *mutt_str_strdup(const char *str)
{
  if (!str || !*str)
    return NULL;

  const size_t len = strlen(str) + 1;
  char *copy = mutt_mem_malloc(len);
  memcpy(copy, str, len);
  return copy;
}

char *mutt_file_dirname(const char *path)
{
  char *copy = mutt_str_strdup(path);
  char *dir = dirname(copy);
  if (dir != copy)
  {
    free(copy);
    dir = strdup(dir);
  }
  return dir;
}

int main()
{
  const char *s = NULL;
  char *d = NULL;

  char *test[] = {
    "/usr/share",
    "/usr/share/",
    "mutt",
    ".",
    "..",
    "/",
    "//",
    NULL
  };

  for (size_t i = 0; i < mutt_array_size(test); i++)
  {
    s = test[i];
    d = mutt_file_dirname(s);
    printf("%s -> %s\n", s, d);
    free(d);
  }

  return 0;
}