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(decode_oflag): New function.

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(main): Use it to support symbolic open flags.
This commit is contained in:
Paul Eggert
1999-08-11 12:47:01 +00:00
parent 36682e50cc
commit db46e2e2b3
1 changed files with 81 additions and 4 deletions
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85
src/rmt.c
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@@ -175,6 +175,83 @@ prepare_record_buffer (size_t size)
#endif
}
/* Decode OFLAG_STRING, which represents the 2nd argument to `open'.
OFLAG_STRING should contain an integer, followed by an optional
symbolic representation of an open flag using only '|' to separate
its components (e.g. "O_WRONLY|O_CREAT|O_TRUNC"). Prefer the
symbolic representation if available, falling back on the numeric
representation otherwise.
This function should be the inverse of encode_oflag. The numeric
representation is not portable from one host to another, but it is
for backward compatibility with old-fashioned clients that do not
emit symbolic open flags. */
static int
decode_oflag (char const *oflag_string)
{
char *oflag_num_end;
int numeric_oflag = strtol (oflag_string, &oflag_num_end, 10);
int symbolic_oflag = 0;
oflag_string = oflag_num_end;
while (ISSPACE ((unsigned char) *oflag_string))
oflag_string++;
do
{
struct name_value_pair { char const *name; int value; };
static struct name_value_pair const table[] =
{
{"APPEND", O_APPEND},
{"CREAT", O_CREAT},
#ifdef O_DSYNC
{"DSYNC", O_DSYNC},
#endif
{"EXCL", O_EXCL},
#ifdef O_LARGEFILE
{"LARGEFILE", O_LARGEFILE}, /* LFS extension for opening large files */
#endif
#ifdef O_NOCTTY
{"NOCTTY", O_NOCTTY},
#endif
#ifdef O_NONBLOCK
{"NONBLOCK", O_NONBLOCK},
#endif
{"RDONLY", O_RDONLY},
{"RDWR", O_RDWR},
#ifdef O_RSYNC
{"RSYNC", O_RSYNC},
#endif
#ifdef O_SYNC
{"SYNC", O_SYNC},
#endif
{"TRUNC", O_TRUNC},
{"WRONLY", O_WRONLY}
};
struct name_value_pair const *t;
size_t s;
if (*oflag_string++ != 'O' || *oflag_string++ != '_')
return numeric_oflag;
for (t = table;
(strncmp (oflag_string, t->name, s = strlen (t->name)) != 0
|| (oflag_string[s]
&& strchr ("ABCDEFGHIJKLMNOPQRSTUVWXYZ_0123456789",
oflag_string[s])));
t++)
if (t == table + sizeof table / sizeof *table - 1)
return numeric_oflag;
symbolic_oflag |= t->value;
oflag_string += s;
}
while (*oflag_string++ == '|');
return symbolic_oflag;
}
/*---.
| ? |
`---*/
@@ -221,16 +298,16 @@ top:
case 'O':
{
char device_string[STRING_SIZE];
char mode_string[STRING_SIZE];
char oflag_string[STRING_SIZE];
get_string (device_string);
get_string (mode_string);
DEBUG2 ("rmtd: O %s %s\n", device_string, mode_string);
get_string (oflag_string);
DEBUG2 ("rmtd: O %s %s\n", device_string, oflag_string);
if (tape >= 0)
close (tape);
tape = open (device_string, atoi (mode_string), 0666);
tape = open (device_string, decode_oflag (oflag_string), MODE_RW);
if (tape < 0)
goto ioerror;
goto respond;