96 lines
2.7 KiB
Groff
96 lines
2.7 KiB
Groff
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.Dd November 20, 2012
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.Dt LIBDIRUTILS 3
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.Os
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.Sh NAME
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.Nm libdirutils
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.Nd Python-esque file utility functions for C
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.Sh SYNOPSIS
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.In dirutils.h
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.Ft int
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.Fo makedirs
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.Fa "const char *path"
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.Fc
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.Ft EXISTS_STATUS
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.Fo path_exists
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.Fa "const char *path"
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.Fc
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.Ft int
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.Fo rmdirs
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.Fa "const char *path"
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.Fc
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.Ft int
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.Fo walkpath
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.Fa "const char *root"
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.Fa "dirwalk_action action"
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.Fa "unsigned char mask"
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.Sh DESCRIPTION
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.Nm
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provides a number of convenience functions for working with files and
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directories; as the name implies, it is aimed primarily at directories.
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.Nm makedirs
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provides functionality similar to
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.Ic mkdir -p ,
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creating all the parent directories required. They are created with the
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caller's umask applied to the mode 0777.
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.Nm path_exists
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returns an EXISTS_STATUS value (described below) indicated the status
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of the file.
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.Nm rmdirs
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provides functionality similar to
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.Ic rm -r .
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.Nm walkpath
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walks through a path on disk and calls an action on a file if it
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matches the file type mask. The mask should include some of the
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file types listed in
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.Xr readdir 3 ,
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such as DT_DIR or DT_REG. The convenience definitions
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.Ic FT_ANY
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and
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.Ic FT_STD
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are provided; the former matches any file type and the latter matches
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regular files and directories. Note that this will not follow links.
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The action is defined in the dirutils.h header as
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.Ic typedef int (*dirwalk_action)(const char *) ;
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it takes a NULL-terminated path and does what it will with that path.
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It should return -1 on failure and 0 on success. Note that in the case
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where the path provided to
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.Nm walkdir
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is not a directory, but its type matches the mask, the action will
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still be run on it.
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.Sh RETURN VALUES
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.Nm makedirs
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and
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.Nm rmdirs
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return EXIT_SUCCESS on success and EXIT_FAILURE on failure. The enum
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returned by
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.Nm path_exists
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is defined in
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.Sy dirutils.h
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as:
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.Bd -literal
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enum E_EXISTS_STATUS {
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EXISTS_ERROR, /* an error occurred looking at the file */
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EXISTS_NOENT, /* the path does not exist */
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EXISTS_NOPERM, /* the process does not have appropriate permissions */
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EXISTS_DIR, /* the path exists and is a directory */
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EXISTS_FILE, /* the path exists and is a regular file */
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EXISTS_OTHER /* the path exists and is not a directory or regular */
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/* file. */
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};
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.Ed
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.Sh ERRORS
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The most common error will be a permissions error; it may be prudent to
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compare the value of
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.Nm errno
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before and after calling the function.
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.Sh HISTORY
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.Nm
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was inspired by similar functions in the Python and Go programming languages.
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The author found himself in need of such functions in several projects,
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and decided to write a utility library to handle these functions.
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.Sh AUTHORS
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The
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.Nm
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library was written by
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.An Kyle Isom Aq Mt kyle@tyrfingr.is .
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