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Implement basic chmod() syscall and /bin/chmod helper.

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Only raw octal modes are supported right now.
This patch also changes mode_t from 32-bit to 16-bit to match the on-disk
type used by Ext2FS.

I also ran into EPERM being errno=0 which was confusing, so I inserted an
ESUCCESS in its place.
This commit is contained in:
Andreas Kling 2019-01-29 04:55:08 +01:00
parent ad53f6afd3
commit c30e2c8d44
22 changed files with 156 additions and 4 deletions
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45
AK/printf.cpp
View file

@ -66,6 +66,47 @@ ALWAYS_INLINE int printNumber(PutChFunc putch, char*& bufptr, dword number, bool
return fieldWidth;
}
template<typename PutChFunc>
ALWAYS_INLINE int print_octal_number(PutChFunc putch, char*& bufptr, dword number, bool leftPad, bool zeroPad, dword fieldWidth)
{
dword divisor = 134217728;
char ch;
char padding = 1;
char buf[32];
char* p = buf;
for (;;) {
ch = '0' + (number / divisor);
number %= divisor;
if (ch != '0')
padding = 0;
if (!padding || divisor == 1)
*(p++) = ch;
if (divisor == 1)
break;
divisor /= 8;
}
size_t numlen = p - buf;
if (!fieldWidth || fieldWidth < numlen)
fieldWidth = numlen;
if (!leftPad) {
for (unsigned i = 0; i < fieldWidth - numlen; ++i) {
putch(bufptr, zeroPad ? '0' : ' ');
}
}
for (unsigned i = 0; i < numlen; ++i) {
putch(bufptr, buf[i]);
}
if (leftPad) {
for (unsigned i = 0; i < fieldWidth - numlen; ++i) {
putch(bufptr, ' ');
}
}
return fieldWidth;
}
template<typename PutChFunc>
ALWAYS_INLINE int printString(PutChFunc putch, char*& bufptr, const char* str, bool leftPad, dword fieldWidth)
{
@ -145,6 +186,10 @@ one_more:
ret += printNumber(putch, bufptr, va_arg(ap, dword), leftPad, zeroPad, fieldWidth);
break;
case 'o':
ret += print_octal_number(putch, bufptr, va_arg(ap, dword), leftPad, zeroPad, fieldWidth);
break;
case 'x':
ret += printHex(putch, bufptr, va_arg(ap, dword), 8);
break;