octal-only chmod

This commit is contained in:
Connor Lane Smith 2011-05-27 23:48:07 +01:00
parent 73c2898e91
commit 2dfe5c6b8b
4 changed files with 88 additions and 4 deletions

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@ -4,9 +4,9 @@ HDR = text.h util.h
LIB = util/afgets.o util/agetcwd.o util/concat.o util/enmasse.o util/eprintf.o \ LIB = util/afgets.o util/agetcwd.o util/concat.o util/enmasse.o util/eprintf.o \
util/recurse.o util/recurse.o
SRC = basename.c cat.c chown.c date.c dirname.c echo.c false.c grep.c head.c \ SRC = basename.c cat.c chmod.c chown.c date.c dirname.c echo.c false.c grep.c \
ln.c ls.c mkdir.c mkfifo.c pwd.c rm.c sleep.c tail.c tee.c touch.c \ head.c ln.c ls.c mkdir.c mkfifo.c pwd.c rm.c sleep.c tail.c tee.c \
true.c wc.c touch.c true.c wc.c
OBJ = $(SRC:.c=.o) $(LIB) OBJ = $(SRC:.c=.o) $(LIB)
BIN = $(SRC:.c=) BIN = $(SRC:.c=)
MAN = $(SRC:.c=.1) MAN = $(SRC:.c=.1)

24
chmod.1 Normal file
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@ -0,0 +1,24 @@
.TH CHMOD 1 sbase\-VERSION
.SH NAME
chmod \- change file mode
.SH SYNOPSIS
.B chmod
.RB [ -Rr ]
.RI mode
.RI [ file ...]
.SH DESCRIPTION
.B chmod
changes the file mode for the given files. The
.I mode
is a four digit octal number derived from its comprising bits.
.P
The first digit defines the setuid (4), setgid (2), and sticky (1) attributes.
The second digit defines the owner's permissions: read (4), write (2), and
execute (1); the third defines permissions for others in the file's group; and
the fourth for all other users. Leading zeroes may be omitted.
.SH OPTIONS
.TP
.B -R, -r
change directory mode recursively.
.SH SEE ALSO
.IR chmod (2)

61
chmod.c Normal file
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@ -0,0 +1,61 @@
/* See LICENSE file for copyright and license details. */
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include "util.h"
static void chmodr(const char *);
static bool rflag = false;
static mode_t mode = 0;
int
main(int argc, char *argv[])
{
char c, *end;
int octal;
while((c = getopt(argc, argv, "Rr")) != -1)
switch(c) {
case 'R':
case 'r':
rflag = true;
break;
default:
exit(EXIT_FAILURE);
}
if(optind == argc)
eprintf("usage: %s [-Rr] mode [file...]\n", argv[0]);
octal = strtol(argv[optind++], &end, 8);
if(*end != '\0')
eprintf("%s: not an octal number\n", argv[optind-1]);
/* posix doesn't specify modal bits */
if(octal & 04000) mode |= S_ISUID;
if(octal & 02000) mode |= S_ISGID;
if(octal & 01000) mode |= S_ISVTX;
if(octal & 00400) mode |= S_IRUSR;
if(octal & 00200) mode |= S_IWUSR;
if(octal & 00100) mode |= S_IXUSR;
if(octal & 00040) mode |= S_IRGRP;
if(octal & 00020) mode |= S_IWGRP;
if(octal & 00010) mode |= S_IXGRP;
if(octal & 00004) mode |= S_IROTH;
if(octal & 00002) mode |= S_IWOTH;
if(octal & 00001) mode |= S_IXOTH;
for(; optind < argc; optind++)
chmodr(argv[optind]);
return EXIT_SUCCESS;
}
void
chmodr(const char *path)
{
if(chmod(path, mode) != 0)
eprintf("chmod %s:", path);
if(rflag)
recurse(path, chmodr);
}

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@ -3,7 +3,6 @@
#include <grp.h> #include <grp.h>
#include <pwd.h> #include <pwd.h>
#include <stdbool.h> #include <stdbool.h>
#include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
#include <string.h> #include <string.h>
#include <unistd.h> #include <unistd.h>