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xxd: fix -p -r, closes 13881

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function                                             old     new   delta
xxd_main                                             893     890      -3

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2021-10-08 23:03:54 +02:00
parent d315a77a79
commit 86ba007b84
2 changed files with 44 additions and 13 deletions
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6
testsuite/xxd.tests
View File

@ -31,4 +31,10 @@ testing 'xxd -p with 31 NULs' \
'' \
'\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0'
testing 'xxd -p -r' \
'xxd -p -r' \
'01234567765432100123456776543210' \
'' \
'30313233343536373736353433323130 30313233343536373736353433323130'
exit $FAILCOUNT

49
util-linux/hexdump_xxd.c
View File

@ -69,7 +69,7 @@
#define OPT_c (1 << 7)
#define OPT_o (1 << 8)
static void reverse(unsigned opt, unsigned cols, const char *filename)
static void reverse(unsigned opt, const char *filename)
{
FILE *fp;
char *buf;
@ -77,9 +77,9 @@ static void reverse(unsigned opt, unsigned cols, const char *filename)
fp = filename ? xfopen_for_read(filename) : stdin;
while ((buf = xmalloc_fgetline(fp)) != NULL) {
char *p = buf;
unsigned cnt = cols;
char *p;
p = buf;
if (!(opt & OPT_p)) {
/* skip address */
while (isxdigit(*p)) p++;
@ -92,9 +92,9 @@ static void reverse(unsigned opt, unsigned cols, const char *filename)
}
/* Process hex bytes optionally separated by whitespace */
do {
for (;;) {
uint8_t val, c;
nibble1:
p = skip_whitespace(p);
c = *p++;
@ -102,8 +102,19 @@ static void reverse(unsigned opt, unsigned cols, const char *filename)
val = c - '0';
else if ((c|0x20) >= 'a' && (c|0x20) <= 'f')
val = (c|0x20) - ('a' - 10);
else
else {
/* xxd V1.10 is inconsistent here.
* echo -e "31 !3 0a 0a" | xxd -r -p
* is "10<a0>" (no <cr>) - "!" is ignored,
* but
* echo -e "31 !!343434\n30 0a" | xxd -r -p
* is "10<cr>" - "!!" drops rest of the line.
* We will ignore all invalid chars:
*/
if (c != '\0')
goto nibble1;
break;
}
val <<= 4;
/* Works the same with xxd V1.10:
@ -111,6 +122,7 @@ static void reverse(unsigned opt, unsigned cols, const char *filename)
* echo "31 0 9 32 0a" | xxd -r -p
* thus allow whitespace even within the byte:
*/
nibble2:
p = skip_whitespace(p);
c = *p++;
@ -118,10 +130,23 @@ static void reverse(unsigned opt, unsigned cols, const char *filename)
val |= c - '0';
else if ((c|0x20) >= 'a' && (c|0x20) <= 'f')
val |= (c|0x20) - ('a' - 10);
else
else {
if (c != '\0') {
/* "...3<not_hex_char>..." ignores both chars */
goto nibble1;
}
/* Nibbles can join even through newline:
* echo -e "31 3\n2 0a" | xxd -r -p
* is "12<cr>".
*/
free(buf);
p = buf = xmalloc_fgetline(fp);
if (!buf)
break;
goto nibble2;
}
putchar(val);
} while (!(opt & OPT_p) || --cnt != 0);
}
free(buf);
}
//fclose(fp);
@ -174,6 +199,10 @@ int xxd_main(int argc UNUSED_PARAM, char **argv)
//BUGGY for /proc/version (unseekable?)
}
if (opt & OPT_r) {
reverse(opt, argv[0]);
}
if (opt & OPT_o) {
/* -o accepts negative numbers too */
dumper->xxd_displayoff = xstrtoll(opt_o, /*base:*/ 0);
@ -194,10 +223,6 @@ int xxd_main(int argc UNUSED_PARAM, char **argv)
bb_dump_add(dumper, "\"%08.8_ax: \""); // "address: "
}
if (opt & OPT_r) {
reverse(opt, cols, argv[0]);
}
if (bytes < 1 || bytes >= cols) {
sprintf(buf, "%u/1 \"%%02x\"", cols); // cols * "XX"
bb_dump_add(dumper, buf);