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/****************************************************************************
* bfs *
* Copyright (C) 2016-2022 Tavian Barnes <tavianator@tavianator.com> *
* *
* Permission to use, copy, modify, and/or distribute this software for any *
* purpose with or without fee is hereby granted. *
* *
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES *
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF *
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR *
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES *
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN *
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF *
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. *
****************************************************************************/
/**
* Standard library wrappers and polyfills.
*/
#ifndef BFS_BFSTD_H
#define BFS_BFSTD_H
#include <stdbool.h>
// #include <errno.h>
/**
* Return whether an error code is due to a path not existing.
*/
bool is_nonexistence_error(int error);
#include <fcntl.h>
#ifndef O_DIRECTORY
# define O_DIRECTORY 0
#endif
#include <fnmatch.h>
#if !defined(FNM_CASEFOLD) && defined(FNM_IGNORECASE)
# define FNM_CASEFOLD FNM_IGNORECASE
#endif
// #include <libgen.h>
/**
* basename() variant that doesn't modify the input.
*
* @param path
* The path in question.
* @return A pointer into path at the base name offset.
*/
const char *xbasename(const char *path);
#include <stdio.h>
/**
* close() variant that preserves errno.
*
* @param fd
* The file descriptor to close.
*/
void close_quietly(int fd);
/**
* close() wrapper that asserts the file descriptor is valid.
*
* @param fd
* The file descriptor to close.
* @return
* 0 on success, or -1 on error.
*/
int xclose(int fd);
/**
* fopen() variant that takes open() style flags.
*
* @param path
* The path to open.
* @param flags
* Flags to pass to open().
*/
FILE *xfopen(const char *path, int flags);
/**
* Convenience wrapper for getdelim().
*
* @param file
* The file to read.
* @param delim
* The delimiter character to split on.
* @return
* The read chunk (without the delimiter), allocated with malloc().
* NULL is returned on error (errno != 0) or end of file (errno == 0).
*/
char *xgetdelim(FILE *file, char delim);
/**
* A safe version of read() that handles interrupted system calls and partial
* reads.
*
* @return
* The number of bytes read. A value != nbytes indicates an error
* (errno != 0) or end of file (errno == 0).
*/
size_t xread(int fd, void *buf, size_t nbytes);
/**
* A safe version of write() that handles interrupted system calls and partial
* writes.
*
* @return
The number of bytes written. A value != nbytes indicates an error.
*/
size_t xwrite(int fd, const void *buf, size_t nbytes);
// #include <stdlib.h>
/**
* Process a yes/no prompt.
*
* @return 1 for yes, 0 for no, and -1 for unknown.
*/
int ynprompt(void);
// #include <string.h>
/**
* Format a mode like ls -l (e.g. -rw-r--r--).
*
* @param mode
* The mode to format.
* @param str
* The string to hold the formatted mode.
*/
void xstrmode(mode_t mode, char str[11]);
#include <sys/types.h>
/**
* Portable version of makedev().
*/
dev_t xmakedev(int ma, int mi);
/**
* Portable version of major().
*/
int xmajor(dev_t dev);
/**
* Portable version of minor().
*/
int xminor(dev_t dev);
// #include <sys/stat.h>
#if __APPLE__
# define st_atim st_atimespec
# define st_ctim st_ctimespec
# define st_mtim st_mtimespec
# define st_birthtim st_birthtimespec
#endif
// #include <unistd.h>
/**
* Like dup(), but set the FD_CLOEXEC flag.
*
* @param fd
* The file descriptor to duplicate.
* @return
* A duplicated file descriptor, or -1 on failure.
*/
int dup_cloexec(int fd);
/**
* Like pipe(), but set the FD_CLOEXEC flag.
*
* @param pipefd
* The array to hold the two file descriptors.
* @return
* 0 on success, -1 on failure.
*/
int pipe_cloexec(int pipefd[2]);
/**
* Wrapper for confstr() that allocates with malloc().
*
* @param name
* The ID of the confstr to look up.
* @return
* The value of the confstr, or NULL on failure.
*/
char *xconfstr(int name);
/**
* Wrapper for faccessat() that handles some portability issues.
*/
int xfaccessat(int fd, const char *path, int amode);
/**
* readlinkat() wrapper that dynamically allocates the result.
*
* @param fd
* The base directory descriptor.
* @param path
* The path to the link, relative to fd.
* @param size
* An estimate for the size of the link name (pass 0 if unknown).
* @return
* The target of the link, allocated with malloc(), or NULL on failure.
*/
char *xreadlinkat(int fd, const char *path, size_t size);
/**
* Portability wrapper for strtofflags().
*
* @param str
* The string to parse. The pointee will be advanced to the first
* invalid position on error.
* @param set
* The flags that are set in the string.
* @param clear
* The flags that are cleared in the string.
* @return
* 0 on success, -1 on failure.
*/
int xstrtofflags(const char **str, unsigned long long *set, unsigned long long *clear);
// #include <wchar.h>
/**
* wcswidth() variant that works on narrow strings.
*
* @param str
* The string to measure.
* @return
* The likely width of that string in a terminal.
*/
size_t xstrwidth(const char *str);
#endif // BFS_BFSTD_H
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