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tr: support octal ranges

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now, we can do printf "a\tb\tcdef\n" | ./busybox tr -d "\1-\14b-e"
af

and bonus, we save some bytes.

function                                             old     new   delta
expand                                               718     699     -19
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-19)             Total: -19
bytes

Signed-off-by: Richard Genoud <richard.genoud@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Richard Genoud 2015-10-26 10:10:28 +01:00 committed by Denys Vlasenko
parent 028524317d
commit d683c5c2f1
1 changed files with 18 additions and 5 deletions
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23
coreutils/tr.c
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@ -91,7 +91,6 @@ static void map(char *pvector,
* Character classes, e.g. [:upper:] ==> A...Z
* Equiv classess, e.g. [=A=] ==> A (hmmmmmmm?)
* not supported:
* \ooo-\ooo - octal ranges
* [x*N] - repeat char x N times
* [x*] - repeat char x until it fills STRING2:
* # echo qwe123 | /usr/bin/tr 123456789 '[d]'
@ -99,7 +98,7 @@ static void map(char *pvector,
* # echo qwe123 | /usr/bin/tr 123456789 '[d*]'
* qweddd
*/
static unsigned expand(const char *arg, char **buffer_p)
static unsigned expand(char *arg, char **buffer_p)
{
char *buffer = *buffer_p;
unsigned pos = 0;
@ -113,9 +112,17 @@ static unsigned expand(const char *arg, char **buffer_p)
*buffer_p = buffer = xrealloc(buffer, size);
}
if (*arg == '\\') {
const char *z;
arg++;
buffer[pos++] = bb_process_escape_sequence(&arg);
continue;
z = arg;
ac = bb_process_escape_sequence(&z);
arg = (char *)z;
arg--;
*arg = ac;
/*
* fall through, there may be a range.
* If not, current char will be treated anyway.
*/
}
if (arg[1] == '-') { /* "0-9..." */
ac = arg[2];
@ -124,9 +131,15 @@ static unsigned expand(const char *arg, char **buffer_p)
continue; /* next iter will copy '-' and stop */
}
i = (unsigned char) *arg;
arg += 3; /* skip 0-9 or 0-\ */
if (ac == '\\') {
const char *z;
z = arg;
ac = bb_process_escape_sequence(&z);
arg = (char *)z;
}
while (i <= ac) /* ok: i is unsigned _int_ */
buffer[pos++] = i++;
arg += 3; /* skip 0-9 */
continue;
}
if ((ENABLE_FEATURE_TR_CLASSES || ENABLE_FEATURE_TR_EQUIV)