dat@hpcnoe.UUCP (dat) (12/09/84)
Enclosed is a small program that allows a user to change the
mode of a file or set of files using the access display method used
by the ls program with the '-l' option. Namely, I can now type;
chmode rwxr-xr-x *
and have them changed correctly! Neato, eh?
Notes, Comments, Flames, Donations (!!) replied to...
Dave Taylor
Hewlett Packard Corp.
Colorado Networks Operation
USENET: ..hpfcla!hpcnoe!dat
ARPANET: no address...
NITNET: taylor%$%hp
FLOGNET: d_t<-<-<-cno
US MAIL: 3040 Harmony, FC CO, 80525
---------------------- cut here and save as chmode.c -----------------------
/*** chmode.c ***/
/* New version of the chmod program: accepts inputs of the
same format as given by the ls -l command, ie it can
be invoked like 'chmode rwxrw-r-- *' to make the modes
of each file specified match the template!
(C) 1984 Dave Taylor - HP Colorado Networks Operation
Permission is hereby given for NON-PROFIT distribution of
this software...all donations cheerily accepted!!!
If automatic aggregate initialization is available, compile with;
cc -Dauto chmode.c -o chmode
otherwise, use;
cc chmode.c -o chmode
*/
#include <stdio.h>
#define ERROR -1
#define O_RD 256 /** 400 octal **/
#define O_WR 128 /** 200 octal **/
#define O_EX 64 /** 100 octal **/
#define G_RD 32 /** 40 octal **/
#define G_WR 16 /** 20 octal **/
#define G_EX 8 /** 10 octal **/
#define E_RD 4
#define E_WR 2
#define E_EX 1
main(argc, argv)
int argc;
char *argv[];
{
register int newmode = 0, j = 1;
char buffer[9];
if (argc < 3)
exit(printf("Usage: %s <graphic mode> <file(s)>\n",argv[0]));
--argc;
strncpy(buffer,argv[j++], 9);
if (strlen(buffer) != 9)
exit(printf("Usage: %s <9 char graphic mode> <file(s)>\n",argv[0]));
/** lets figure out the graphic mode translation! **/
if ((newmode = translate(buffer)) == ERROR) {
printf("Bad graphic mode designator! Please use 'rwxrwxrwx' as a template, \n");
printf("indicating those accesses that you desire to prevent with a dash\n");
printf(" For example: 'chmode rw-r--r-- test.c'\n");
exit(1);
}
while (--argc > 0)
chmod(argv[j++], newmode);
}
int
translate(buffer)
char buffer[];
{
/** translate a graphic representation of file access to
an equivalent number as defined in CHMOD(2) **/
register int loc = 0, sum = 0, val;
#ifdef auto
char type[] = "rwxrwxrwx";
int mode[] = { O_RD, O_WR, O_EX, G_RD, G_WR, G_EX, E_RD, E_WR, E_EX };
#else
char type[9];
int mode[9];
mode[0] = O_RD; mode[1] = O_WR; mode[2] = O_EX;
mode[3] = G_RD; mode[4] = G_WR; mode[5] = G_EX;
mode[6] = E_RD; mode[7] = E_WR; mode[8] = E_EX;
strcpy(type,"rwxrwxrwx");
#endif
for (loc = 0; loc < 9; loc++)
if ((val = check(buffer[loc], type[loc], mode[loc])) == ERROR)
return(ERROR);
else sum += val;
return(sum);
}
int
check(ch, type, mask)
char ch;
int mask;
{
/** check to see if ch is either type or '-', returning
either mask or ERROR **/
if (ch == type) return(mask);
else if (ch == '-') return(0);
else return(ERROR);
}