src/common/util-common.c


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/*
 *  util-common.c
 *
 *  Copyright (c) 2006-2013 Pacman Development Team <pacman-dev@archlinux.org>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

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

#include "util-common.h"


/** Parse the basename of a program from a path.
* @param path path to parse basename from
*
* @return everything following the final '/'
*/
const char *mbasename(const char *path)
{
  const char *last = strrchr(path, '/');
  if(last) {
    return last + 1;
  }
  return path;
}

/** Parse the dirname of a program from a path.
* The path returned should be freed.
* @param path path to parse dirname from
*
* @return everything preceding the final '/'
*/
char *mdirname(const char *path)
{
  char *ret, *last;

  /* null or empty path */
  if(path == NULL || *path == '\0') {
    return strdup(".");
  }

  if((ret = strdup(path)) == NULL) {
    return NULL;
  }

  last = strrchr(ret, '/');

  if(last != NULL) {
    /* we found a '/', so terminate our string */
    if(last == ret) {
      /* return "/" for root */
      last++;
    }
    *last = '\0';
    return ret;
  }

  /* no slash found */
  free(ret);
  return strdup(".");
}

#ifndef HAVE_STRNDUP
/* A quick and dirty implementation derived from glibc */
/** Determines the length of a fixed-size string.
 * @param s string to be measured
 * @param max maximum number of characters to search for the string end
 * @return length of s or max, whichever is smaller
 */
static size_t strnlen(const char *s, size_t max)
{
    register const char *p;
    for(p = s; *p && max--; ++p);
    return (p - s);
}

/** Copies a string.
 * Returned string needs to be freed
 * @param s string to be copied
 * @param n maximum number of characters to copy
 * @return pointer to the new string on success, NULL on error
 */
char *strndup(const char *s, size_t n)
{
  size_t len = strnlen(s, n);
  char *new = (char *) malloc(len + 1);

  if(new == NULL)
    return NULL;

  new[len] = '\0';
  return (char *)memcpy(new, s, len);
}
#endif

/* vim: set ts=2 sw=2 noet: */