misc.h

/*
    Copyright 2006,2007,2008,2012 Martin Pärtel <martin.partel@gmail.com>

    This file is part of bindfs.

    bindfs 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.

    bindfs 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 bindfs.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef INC_BINDFS_MISC_H
#define INC_BINDFS_MISC_H


/* Counts the number of times ch occurs in s. */
int count_chars(const char *s, char ch);

/* Counts the number of times sub occurs in s. */
int count_substrs(const char *s, const char *sub);

/* Creates a duplicate string of all the characters in s before
   an end character is reached. */
char *strdup_until(const char *s, const char *endchars);

/* Like sprintf but writes to an automatically malloc'ed buffer. */
char *sprintf_new(const char *format, ...);

/* Returns a pointer to the first character after the
   final slash of path, or path itself if it contains no slashes.
   If the path ends with a slash, then the result is an empty
   string.
   Returns NULL if path is NULL. */
const char *my_basename(const char *path);

/* A thread-safe version of dirname, with slightly different behavior.
   If path is ".", returns "..".
   If path is "/", returns "/".
   If path has an initial slash but no other slashes, returns "/".
   If path contains a slash, replaces the last slash with a '\0' and returns path.
   Otherwise, returns ".". */
const char *my_dirname(char *path);

/* Reallocs `*array` (may be NULL) to be at least one larger
   than `*capacity` (may be 0) and stores the new capacity
   in `*capacity`. */
#define grow_array(array, capacity, member_size) grow_array_impl((void**)(array), (capacity), (member_size))
void grow_array_impl(void **array, int *capacity, int member_size);

/* Returns 1 on success, 0 on syntax error. */
int parse_byte_count(const char *str, double *result);

/* Simple arena allocation for when it's convenient to
   grow multiple times and deallocate all at once. */
struct arena {
    char *ptr;
    int size;
    int capacity;
};

#define ARENA_INITIALIZER { NULL, 0, 0 }

void init_arena(struct arena *a, int initial_capacity);
void grow_arena(struct arena *a, int amount);
int append_to_arena(struct arena *a, void *src, int src_size);
void free_arena(struct arena *a);

#define ARENA_GET(a, offset) (&(a).ptr[(offset)])

#endif