mc/lib/util.h

303 lines
9.3 KiB
C

/** \file util.h
* \brief Header: various utilities
*/
#ifndef MC_UTIL_H
#define MC_UTIL_H
#include "lib/global.h" /* include <glib.h> */
#include <string.h>
#include <assert.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
/* Returns its argument as a "modifiable" string. This function is
* intended to pass strings to legacy libraries that don't know yet
* about the "const" modifier. The return value of this function
* MUST NOT be modified. */
extern char *str_unconst (const char *);
/* String managing functions */
extern const char *cstrcasestr (const char *haystack, const char *needle);
extern const char *cstrstr (const char *haystack, const char *needle);
void str_replace(char *s, char from, char to);
int is_printable (int c);
void msglen (const char *text, /*@out@*/ int *lines, /*@out@*/ int *columns);
/* Copy from s to d, and trim the beginning if necessary, and prepend
* "..." in this case. The destination string can have at most len
* bytes, not counting trailing 0. */
char *trim (const char *s, char *d, int len);
/* Quote the filename for the purpose of inserting it into the command
* line. If quote_percent is 1, replace "%" with "%%" - the percent is
* processed by the mc command line. */
char *name_quote (const char *c, int quote_percent);
/* returns a duplicate of c. */
char *fake_name_quote (const char *c, int quote_percent);
/* Remove the middle part of the string to fit given length.
* Use "~" to show where the string was truncated.
* Return static buffer, no need to free() it. */
const char *name_trunc (const char *txt, size_t trunc_len);
/* path_trunc() is the same as name_trunc() above but
* it deletes possible password from path for security
* reasons. */
const char *path_trunc (const char *path, size_t trunc_len);
/* return a static string representing size, appending "K" or "M" for
* big sizes.
* NOTE: uses the same static buffer as size_trunc_sep. */
const char *size_trunc (double size);
/* return a static string representing size, appending "K" or "M" for
* big sizes. Separates every three digits by ",".
* NOTE: uses the same static buffer as size_trunc. */
const char *size_trunc_sep (double size);
/* Print file SIZE to BUFFER, but don't exceed LEN characters,
* not including trailing 0. BUFFER should be at least LEN+1 long.
*
* Units: size units (0=bytes, 1=Kbytes, 2=Mbytes, etc.) */
void size_trunc_len (char *buffer, unsigned int len, off_t size, int units);
int is_exe (mode_t mode);
const char *string_perm (mode_t mode_bits);
/* @modifies path. @returns pointer into path. */
char *strip_password (char *path, int has_prefix);
/* @returns a pointer into a static buffer. */
const char *strip_home_and_password (const char *dir);
const char *extension (const char *);
char *concat_dir_and_file (const char *dir, const char *file);
const char *unix_error_string (int error_num);
const char *skip_separators (const char *s);
const char *skip_numbers (const char *s);
char *strip_ctrl_codes (char *s);
/* Replaces "\\E" and "\\e" with "\033". Replaces "^" + [a-z] with
* ((char) 1 + (c - 'a')). The same goes for "^" + [A-Z].
* Returns a newly allocated string. */
char *convert_controls (const char *s);
/* overwrites passwd with '\0's and frees it. */
void wipe_password (char *passwd);
char *diff_two_paths (const char *first, const char *second);
/* Returns the basename of fname. The result is a pointer into fname. */
const char *x_basename (const char *fname);
char *load_file (const char *filename);
char *load_mc_home_file (const char *, const char *, const char *filename, char ** allocated_filename);
/* uid/gid managing */
void init_groups (void);
void destroy_groups (void);
int get_user_permissions (struct stat *buf);
void init_uid_gid_cache (void);
char *get_group (int);
char *get_owner (int);
#define MAX_I18NTIMELENGTH 20
#define MIN_I18NTIMELENGTH 10
#define STD_I18NTIMELENGTH 12
size_t i18n_checktimelength (void);
const char *file_date (time_t);
int exist_file (const char *name);
/* Check if the file exists. If not copy the default */
int check_for_default (const char *default_file, const char *file);
/* Returns a copy of *s until a \n is found and is below top */
const char *extract_line (const char *s, const char *top);
/* Matching */
enum {
match_file, /* match a filename, use easy_patterns */
match_normal, /* match pattern, use easy_patterns */
match_regex /* match pattern, force using regex */
};
extern int easy_patterns;
/* Error pipes */
void open_error_pipe (void);
void check_error_pipe (void);
int close_error_pipe (int error, const char *text);
/* Process spawning */
int my_system (int flags, const char *shell, const char *command);
void save_stop_handler (void);
extern struct sigaction startup_handler;
/* Tilde expansion */
char *tilde_expand (const char *);
/* Pathname canonicalization */
typedef enum {
CANON_PATH_JOINSLASHES = 1L<<0, /* Multiple `/'s are collapsed to a single `/'. */
CANON_PATH_REMSLASHDOTS = 1L<<1, /* Leading `./'s, `/'s and trailing `/.'s are removed. */
CANON_PATH_REMDOUBLEDOTS = 1L<<3, /* Non-leading `../'s and trailing `..'s are handled by removing */
CANON_PATH_GUARDUNC = 1L<<4, /* Detect and preserve UNC paths: //server/... */
CANON_PATH_ALL = CANON_PATH_JOINSLASHES
| CANON_PATH_REMSLASHDOTS
| CANON_PATH_REMDOUBLEDOTS
| CANON_PATH_GUARDUNC
} CANON_PATH_FLAGS;
void custom_canonicalize_pathname (char *, CANON_PATH_FLAGS);
void canonicalize_pathname (char *);
/* Misc Unix functions */
char *get_current_wd (char *buffer, int size);
int my_mkdir (const char *s, mode_t mode);
int my_rmdir (const char *s);
/* Rotating dash routines */
void use_dash (int flag); /* Disable/Enable rotate_dash routines */
void rotate_dash (void);
/* Creating temporary files safely */
const char *mc_tmpdir (void);
int mc_mkstemps(char **pname, const char *prefix, const char *suffix);
#ifndef PATH_MAX
#ifdef _POSIX_VERSION
#define PATH_MAX _POSIX_PATH_MAX
#else
#ifdef MAXPATHLEN
#define PATH_MAX MAXPATHLEN
#else
#define PATH_MAX 1024
#endif
#endif
#endif
#ifndef MAXSYMLINKS
#define MAXSYMLINKS 32
#endif
char *mc_realpath(const char *path, char resolved_path[]);
enum compression_type {
COMPRESSION_NONE,
COMPRESSION_GZIP,
COMPRESSION_BZIP,
COMPRESSION_BZIP2,
COMPRESSION_LZMA,
COMPRESSION_XZ
};
/* Looks for ``magic'' bytes at the start of the VFS file to guess the
* compression type. Side effect: modifies the file position. */
enum compression_type get_compression_type (int fd, const char*);
const char *decompress_extension (int type);
/* Hook functions */
typedef struct hook {
void (*hook_fn)(void *);
void *hook_data;
struct hook *next;
} Hook;
void add_hook (Hook **hook_list, void (*hook_fn)(void *), void *data);
void execute_hooks (Hook *hook_list);
void delete_hook (Hook **hook_list, void (*hook_fn)(void *));
int hook_present (Hook *hook_list, void (*hook_fn)(void *));
GList *list_append_unique (GList *list, char *text);
/* Position saving and restoring */
/* Load position for the given filename */
void load_file_position (const char *filename, long *line, long *column, off_t *offset);
/* Save position for the given filename */
void save_file_position (const char *filename, long line, long column, off_t offset);
/* OS specific defines */
#define PATH_SEP '/'
#define PATH_SEP_STR "/"
#define PATH_ENV_SEP ':'
#define TMPDIR_DEFAULT "/tmp"
#define SCRIPT_SUFFIX ""
#define get_default_editor() "vi"
#define OS_SORT_CASE_SENSITIVE_DEFAULT 1
#define STRCOMP strcmp
#define STRNCOMP strncmp
#define MC_ARCH_FLAGS 0
/* taken from regex.c: */
/* Jim Meyering writes:
"... Some ctype macros are valid only for character codes that
isascii says are ASCII (SGI's IRIX-4.0.5 is one such system --when
using /bin/cc or gcc but without giving an ansi option). So, all
ctype uses should be through macros like ISPRINT... If
STDC_HEADERS is defined, then autoconf has verified that the ctype
macros don't need to be guarded with references to isascii. ...
Defining isascii to 1 should let any compiler worth its salt
eliminate the && through constant folding." */
#if defined (STDC_HEADERS) || (!defined (isascii) && !defined (HAVE_ISASCII))
#define ISASCII(c) 1
#else
#define ISASCII(c) isascii(c)
#endif
/* usage: str_cmp ("foo", !=, "bar") */
#define str_cmp(a,rel,b) (strcmp ((a), (b)) rel 0)
/* if ch is in [A-Za-z], returns the corresponding control character,
* else returns the argument. */
extern int ascii_alpha_to_cntrl (int ch);
#undef Q_
const char *Q_ (const char *s);
#define str_dup_range(s_start, s_bound) (g_strndup(s_start, s_bound - s_start))
/*
* strcpy is unsafe on overlapping memory areas, so define memmove-alike
* string function.
* Have sense only when:
* * dest <= src
* AND
* * dest and str are pointers to one object (as Roland Illig pointed).
*
* We can't use str*cpy funs here:
* http://kerneltrap.org/mailarchive/openbsd-misc/2008/5/27/1951294
*/
static inline char * str_move(char * dest, const char * src)
{
size_t n;
assert (dest<=src);
n = strlen (src) + 1; /* + '\0' */
return memmove (dest, src, n);
}
gboolean mc_util_make_backup_if_possible (const char *, const char *);
gboolean mc_util_restore_from_backup_if_possible (const char *, const char *);
gboolean mc_util_unlink_backup_if_possible (const char *, const char *);
char *guess_message_value (void);
#define MC_PTR_FREE(ptr) do { g_free(ptr); (ptr) = NULL; } while (0)
#endif