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Annotation of 43BSD/contrib/emacs/src/filemode.c, revision 1.1

1.1     ! root        1: /* Examine the result of  stat  and make a string describing file modes.
        !             2:    Copyright (C) 1985 Richard M. Stallman.
        !             3: 
        !             4: This file is part of GNU Emacs.
        !             5: 
        !             6: GNU Emacs is distributed in the hope that it will be useful,
        !             7: but WITHOUT ANY WARRANTY.  No author or distributor
        !             8: accepts responsibility to anyone for the consequences of using it
        !             9: or for whether it serves any particular purpose or works at all,
        !            10: unless he says so in writing.  Refer to the GNU Emacs General Public
        !            11: License for full details.
        !            12: 
        !            13: Everyone is granted permission to copy, modify and redistribute
        !            14: GNU Emacs, but only under the conditions described in the
        !            15: GNU Emacs General Public License.   A copy of this license is
        !            16: supposed to have been given to you along with GNU Emacs so you
        !            17: can know your rights and responsibilities.  It should be in a
        !            18: file named COPYING.  Among other things, the copyright notice
        !            19: and this notice must be preserved on all copies.  */
        !            20: 
        !            21: 
        !            22: #include <sys/types.h>
        !            23: #include <sys/stat.h>
        !            24: 
        !            25: /* filemodestring - set file attribute data 
        !            26: 
        !            27: *** WARNING!  FILE STRUCTURE DEPENDENT ***
        !            28: 
        !            29:    Filemodestring converts the data in the st_mode field of file status
        !            30: block `s' to a 10 character attribute string, which it stores in
        !            31: the block that `a' points to.
        !            32: This attribute string is modelled after the string produced by the Berkeley ls.
        !            33: 
        !            34: As usual under Unix, the elements of the string are numbered
        !            35: from 0.  Their meanings are:
        !            36: 
        !            37:    0   File type.  'd' for directory, 'c' for character
        !            38:        special, 'b' for block special, 'm' for multiplex, '-'
        !            39:        for any other file type
        !            40: 
        !            41:    1   'r' if the owner may read, '-' otherwise.
        !            42: 
        !            43:    2   'w' if the owner may write, '-' otherwise.
        !            44: 
        !            45:    3   'x' if the owner may execute, 's' if the file is
        !            46:        set-user-id, '-' otherwise.
        !            47: 
        !            48:    4   'r' if group members may read, '-' otherwise.
        !            49: 
        !            50:    5   'w' if group members may write, '-' otherwise.
        !            51: 
        !            52:    6   'x' if group members may execute, 's' if the file is
        !            53:        set-group-id, '-' otherwise.
        !            54: 
        !            55:    7   'r' if any user may read, '-' otherwise.
        !            56: 
        !            57:    8   'w' if any user may write, '-' otherwise.
        !            58: 
        !            59:    9   'x' if any user may execute, 't' if the file is "sticky"
        !            60:        (will be retained in swap space after execution), '-'
        !            61:        otherwise.
        !            62: 
        !            63:  */
        !            64: 
        !            65: #define TEXT char
        !            66: #define VOID void
        !            67: 
        !            68: static TEXT ftypelet ();
        !            69: static VOID rwx (), setst ();
        !            70: 
        !            71: VOID
        !            72: filemodestring (s,a)
        !            73:    struct stat *s;
        !            74:    TEXT *a;
        !            75: {
        !            76:    a[0] = ftypelet(s);
        !            77:    rwx ((s->st_mode&0700)<<0, &(a[1]));
        !            78:    rwx ((s->st_mode&0070)<<3, &(a[4]));
        !            79:    rwx ((s->st_mode&0007)<<6, &(a[7]));
        !            80:    setst (s->st_mode, a);
        !            81: }
        !            82: 
        !            83: /* ftypelet - file type letter
        !            84: 
        !            85: *** WARNING!  FILE STRUCTURE DEPENDENT ***
        !            86: 
        !            87:    Ftypelet accepts a file status block and returns a character
        !            88: code describing the type of the file.  'd' is returned for
        !            89: directories, 'b' for block special files, 'c' for character
        !            90: special files, 'm' for multiplexor files, and '-' for regular
        !            91: files.
        !            92: 
        !            93:  */
        !            94: 
        !            95: static TEXT
        !            96: ftypelet(s)
        !            97:    struct stat *s;
        !            98: {
        !            99:    
        !           100:    if ((s->st_mode&S_IFMT)==S_IFDIR)
        !           101:       return 'd';
        !           102:    else if ((s->st_mode&S_IFMT)==S_IFCHR)
        !           103:       return 'c';
        !           104:    else if ((s->st_mode&S_IFMT)==S_IFBLK)
        !           105:       return 'b';
        !           106: /* These do not seem to exist */
        !           107: /*   else if ((s->st_mode&S_IFMT)==S_IFMPC ||
        !           108:            (s->st_mode&S_IFMT)==S_IFMPB)
        !           109:       return 'm';
        !           110:  */
        !           111:    else
        !           112:       return '-';
        !           113: }
        !           114: 
        !           115: 
        !           116: /* rwx - look at read, write, and execute bits and set character
        !           117: flags accordingly
        !           118: 
        !           119: *** WARNING!  FILE STRUCTURE DEPENDENT ***
        !           120: 
        !           121:  */
        !           122: 
        !           123: static VOID
        !           124: rwx (bits, chars)
        !           125:    unsigned short bits;
        !           126:    TEXT chars[];
        !           127: {
        !           128:     chars[0] = chars[1] = chars[2] = '-';
        !           129:    if (bits&S_IREAD)
        !           130:       chars[0] = 'r';
        !           131:    if (bits&S_IWRITE)
        !           132:       chars[1] = 'w';
        !           133:    if (bits&S_IEXEC)
        !           134:       chars[2] = 'x';
        !           135: }
        !           136: 
        !           137: 
        !           138: /* setst - set s & t flags in a file attributes string */
        !           139: /* *** WARNING!  FILE STRUCTURE DEPENDENT *** */
        !           140: static VOID
        !           141: setst (bits, chars)
        !           142:    unsigned short bits;
        !           143:    TEXT chars[];
        !           144: {
        !           145:    if (bits&S_ISUID)
        !           146:       chars[3] = 's';
        !           147:    if (bits&S_ISGID)
        !           148:       chars[6] = 's';
        !           149:    if (bits&S_ISVTX)
        !           150:       chars[9] = 't';
        !           151: }

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