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/*
** CHMOD.C - Retrieve or change a DOS file's attributes
**
** public domain demo by Bob Stout
**
** Notes: To expand command line arguments with wildcards,
** TC/TC++/BC++ - Link in WILDARGS.OBJ.
** MSC/QC - Link in SETARGV.OBJ.
** ZTC/C++ - Link in _MAINx.OBJ, where 'x' is the memory model.
**
** Allows file list(s) using standard "@file_list_name" convention.
*/
#include <stdio.h>
#include <stdlib.h>
#include <dos.h>
#include <ctype.h>
#include <string.h>
#define LAST_CHAR(s) (s)[strlen(s)-1]
#if defined(__TURBOC__)
#include <io.h>
#define FAR far
#else
#include <stdarg.h>
#define BOOL(x) (!(!(x)))
#define FAR _far
#if (defined(_MSC_VER) && (_MSC_VER >= 700)) || (defined(__SC__))
// Make FP_xxx macros lvalues as in older versions
#undef FP_SEG
#undef FP_OFF
#define FP_SEG(fp) ((unsigned)((unsigned long)(fp) >> 16))
#define FP_OFF(fp) ((unsigned)(fp && 0xffff))
#endif
int _chmod(const char *path, int func, ...)
{
union REGS regs;
struct SREGS sregs;
int atr = 0;
va_list args;
if (0 != (func = BOOL(func)))
{
va_start(args, func);
atr = va_arg(args, int);
}
regs.x.ax = 0x4300 + func;
regs.x.dx = FP_OFF((char FAR *)path);
regs.x.cx = atr;
segread(&sregs);
sregs.ds = FP_SEG((char FAR *)path);
intdosx(®s, ®s, &sregs);
if (regs.x.cflag)
return -1;
if (func)
return atr;
else return regs.x.cx;
}
#ifndef FA_RDONLY
#define FA_RDONLY _A_RDONLY
#endif
#ifndef FA_HIDDEN
#define FA_HIDDEN _A_HIDDEN
#endif
#ifndef FA_SYSTEM
#define FA_SYSTEM _A_SYSTEM
#endif
#ifndef FA_ARCH
#define FA_ARCH _A_ARCH
#endif
#ifndef FA_LABEL
#define FA_LABEL _A_VOLID
#endif
#ifndef FA_DIREC
#define FA_DIREC _A_SUBDIR
#endif
#endif
int attrib, /* Set up new attributes here */
atr_setmask = 0,
atr_clrmask = -1,
flag = 0; /* Passed as func to _chmod() */
void usage(void) /* Tell 'em they messed up */
{
puts("Usage: CHMOD file [file [...file] [+switches] [-switches]");
puts("Where switches are one or more of:");
puts(" A: Archive");
puts(" R: Read only");
puts(" H: Hidden");
puts(" S: System");
puts("File lists may be specified with \"@file_list_name\"");
puts("With no switches, diplays current attributes.");
puts("Displayed attributes are as above plus:");
puts(" D: Subdirectory");
puts(" V: Volume label");
exit(1);
}
void setattr(char atr) /* Set bits in attribute */
{
switch (toupper(atr))
{
case 'A':
atr_setmask |= FA_ARCH;
break;
case 'R':
atr_setmask |= FA_RDONLY;
break;
case 'S':
atr_setmask |= FA_SYSTEM;
break;
case 'H':
atr_setmask |= FA_HIDDEN;
break;
default:
usage();
}
}
void clrattr(char atr) /* Clear bits in attribute */
{
switch (toupper(atr))
{
case 'A':
atr_clrmask &= ~FA_ARCH;
break;
case 'R':
atr_clrmask &= ~FA_RDONLY;
break;
case 'S':
atr_clrmask &= ~FA_SYSTEM;
break;
case 'H':
atr_clrmask &= ~FA_HIDDEN;
break;
default:
usage();
}
}
void show_atr(char *path)
{
char astr[7], *ptr;
if (-1 == (attrib = _chmod(strupr(path), 0)))
{
ATR_ERR: printf("\aCHMOD: Error! (file: %s)", path);
exit(-1);
}
attrib |= atr_setmask;
attrib &= atr_clrmask;
if (-1 == (attrib = _chmod(path, flag, attrib)))
goto ATR_ERR;
ptr = astr;
*ptr++ = (char)((attrib & FA_ARCH) ? 'A' : '.');
*ptr++ = (char)((attrib & FA_RDONLY) ? 'R' : '.');
*ptr++ = (char)((attrib & FA_SYSTEM) ? 'S' : '.');
*ptr++ = (char)((attrib & FA_HIDDEN) ? 'H' : '.');
*ptr++ = (char)((attrib & FA_DIREC) ? 'D' : '.');
*ptr++ = (char)((attrib & FA_LABEL) ? 'V' : '.');
*ptr = '\0';
printf("%-15s %s\n", path, astr);
}
int main (int argc, char *argv[])
{
int i, j;
if (2 > argc)
usage();
for (i = 1; i < argc; ++i) /* Build attribute masks */
{
switch (*argv[i])
{
case '+':
for (j = 1; argv[i][j]; ++j)
setattr(argv[i][j]);
flag = 1;
break;
case '-':
for (j = 1; argv[i][j]; ++j)
clrattr(argv[i][j]);
flag = 1;
break;
default:
break; /* Assume it's a file name */
}
}
for (i = 1; i < argc; ++i) /* Scan filenames */
{
if (strchr("+-", *argv[i]))
continue;
if ('@' == *argv[i])
{
FILE *fp;
char buf[256], *ptr = &argv[i][1];
if (NULL == (fp = fopen(ptr, "r")))
{
printf("\aCHMOD: Error opening %s\n", ptr);
return -1;
}
while (NULL != fgets(buf, 255, fp))
{
LAST_CHAR(buf) = '\0'; /* Strip '\n' */
show_atr(buf);
}
fclose(fp);
}
else show_atr(argv[i]);
}
return 0;
}
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