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authorGravatar Denis Vlasenko <vda.linux@googlemail.com>2009-03-02 12:05:57 +0000
committerGravatar Denis Vlasenko <vda.linux@googlemail.com>2009-03-02 12:05:57 +0000
commit491d6e3b568967138d3e34c013e925f7b4bf3f08 (patch)
treea7ae68a75d054aa1612ee06e5870cc7914cd2ac7 /coreutils
parent1bfcc8b08e511be7228f93079f669d95392ef184 (diff)
downloadbusybox-491d6e3b568967138d3e34c013e925f7b4bf3f08.tar.gz
busybox-491d6e3b568967138d3e34c013e925f7b4bf3f08.tar.bz2
tr: fix overflow in expand and complement, fix stop after [:class:],
fix order of [:xdigit:], make tr require one param at least. function old new delta expand 1743 1849 +106 tr_main 463 518 +55 complement 72 75 +3 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 3/0 up/down: 164/0) Total: 164 bytes
Diffstat (limited to 'coreutils')
-rw-r--r--coreutils/tr.c235
1 files changed, 131 insertions, 104 deletions
diff --git a/coreutils/tr.c b/coreutils/tr.c
index cd31b8550..bf6fa2996 100644
--- a/coreutils/tr.c
+++ b/coreutils/tr.c
@@ -16,24 +16,31 @@
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
/* http://www.opengroup.org/onlinepubs/009695399/utilities/tr.html
- * TODO: xdigit, graph, print
+ * TODO: graph, print
*/
#include "libbb.h"
-#define ASCII 0377
+enum {
+ ASCII = 256,
+ /* string buffer needs to be at least as big as the whole "alphabet".
+ * BUFSIZ == ASCII is ok, but we will realloc in expand
+ * even for smallest patterns, let's avoid that by using *2:
+ */
+ TR_BUFSIZ = (BUFSIZ > ASCII*2) ? BUFSIZ : ASCII*2,
+};
static void map(char *pvector,
- unsigned char *string1, unsigned string1_len,
- unsigned char *string2, unsigned string2_len)
+ char *string1, unsigned string1_len,
+ char *string2, unsigned string2_len)
{
char last = '0';
unsigned i, j;
for (j = 0, i = 0; i < string1_len; i++) {
if (string2_len <= j)
- pvector[string1[i]] = last;
+ pvector[(unsigned char)(string1[i])] = last;
else
- pvector[string1[i]] = last = string2[j++];
+ pvector[(unsigned char)(string1[i])] = last = string2[j++];
}
}
@@ -43,139 +50,155 @@ static void map(char *pvector,
* Character classes, e.g. [:upper:] ==> A...Z
* Equiv classess, e.g. [=A=] ==> A (hmmmmmmm?)
*/
-static unsigned expand(const char *arg, char *buffer)
+static unsigned expand(const char *arg, char **buffer_p)
{
- char *buffer_start = buffer;
+ char *buffer = *buffer_p;
+ unsigned pos = 0;
+ unsigned size = TR_BUFSIZ;
unsigned i; /* can't be unsigned char: must be able to hold 256 */
unsigned char ac;
while (*arg) {
+ if (pos + ASCII > size) {
+ size += ASCII;
+ *buffer_p = buffer = xrealloc(buffer, size);
+ }
if (*arg == '\\') {
arg++;
- *buffer++ = bb_process_escape_sequence(&arg);
+ buffer[pos++] = bb_process_escape_sequence(&arg);
continue;
}
if (arg[1] == '-') { /* "0-9..." */
ac = arg[2];
if (ac == '\0') { /* "0-": copy verbatim */
- *buffer++ = *arg++; /* copy '0' */
+ buffer[pos++] = *arg++; /* copy '0' */
continue; /* next iter will copy '-' and stop */
}
- i = *arg;
+ i = (unsigned char) *arg;
while (i <= ac) /* ok: i is unsigned _int_ */
- *buffer++ = i++;
+ buffer[pos++] = i++;
arg += 3; /* skip 0-9 */
continue;
}
- if (*arg == '[') { /* "[xyz..." */
+ if ((ENABLE_FEATURE_TR_CLASSES || ENABLE_FEATURE_TR_EQUIV)
+ && *arg == '['
+ ) {
arg++;
- i = *arg++;
- /* "[xyz...", i=x, arg points to y */
- if (ENABLE_FEATURE_TR_CLASSES && i == ':') {
+ i = (unsigned char) *arg++;
+ /* "[xyz...". i=x, arg points to y */
+ if (ENABLE_FEATURE_TR_CLASSES && i == ':') { /* [:class:] */
#define CLO ":]\0"
static const char classes[] ALIGN1 =
"alpha"CLO "alnum"CLO "digit"CLO
"lower"CLO "upper"CLO "space"CLO
"blank"CLO "punct"CLO "cntrl"CLO
"xdigit"CLO;
-#define CLASS_invalid 0 /* we increment the retval */
-#define CLASS_alpha 1
-#define CLASS_alnum 2
-#define CLASS_digit 3
-#define CLASS_lower 4
-#define CLASS_upper 5
-#define CLASS_space 6
-#define CLASS_blank 7
-#define CLASS_punct 8
-#define CLASS_cntrl 9
-#define CLASS_xdigit 10
-//#define CLASS_graph 11
-//#define CLASS_print 12
+ enum {
+ CLASS_invalid = 0, /* we increment the retval */
+ CLASS_alpha = 1,
+ CLASS_alnum = 2,
+ CLASS_digit = 3,
+ CLASS_lower = 4,
+ CLASS_upper = 5,
+ CLASS_space = 6,
+ CLASS_blank = 7,
+ CLASS_punct = 8,
+ CLASS_cntrl = 9,
+ CLASS_xdigit = 10,
+ //CLASS_graph = 11,
+ //CLASS_print = 12,
+ };
smalluint j;
- {
- /* xdigit needs 8, not 7 */
- char *tmp = xstrndup(arg, 7 + (arg[0]=='x'));
- j = index_in_strings(classes, tmp) + 1;
- free(tmp);
- }
+ char *tmp;
+
+ /* xdigit needs 8, not 7 */
+ i = 7 + (arg[0] == 'x');
+ tmp = xstrndup(arg, i);
+ j = index_in_strings(classes, tmp) + 1;
+ free(tmp);
+
+ if (j == CLASS_invalid)
+ goto skip_bracket;
+
+ arg += i;
if (j == CLASS_alnum || j == CLASS_digit || j == CLASS_xdigit) {
for (i = '0'; i <= '9'; i++)
- *buffer++ = i;
+ buffer[pos++] = i;
}
if (j == CLASS_alpha || j == CLASS_alnum || j == CLASS_upper) {
for (i = 'A'; i <= 'Z'; i++)
- *buffer++ = i;
+ buffer[pos++] = i;
}
if (j == CLASS_alpha || j == CLASS_alnum || j == CLASS_lower) {
for (i = 'a'; i <= 'z'; i++)
- *buffer++ = i;
+ buffer[pos++] = i;
}
if (j == CLASS_space || j == CLASS_blank) {
- *buffer++ = '\t';
+ buffer[pos++] = '\t';
if (j == CLASS_space) {
- *buffer++ = '\n';
- *buffer++ = '\v';
- *buffer++ = '\f';
- *buffer++ = '\r';
+ buffer[pos++] = '\n';
+ buffer[pos++] = '\v';
+ buffer[pos++] = '\f';
+ buffer[pos++] = '\r';
}
- *buffer++ = ' ';
+ buffer[pos++] = ' ';
}
if (j == CLASS_punct || j == CLASS_cntrl) {
- for (i = '\0'; i <= ASCII; i++)
+ for (i = '\0'; i < ASCII; i++) {
if ((j == CLASS_punct && isprint(i) && !isalnum(i) && !isspace(i))
- || (j == CLASS_cntrl && iscntrl(i)))
- *buffer++ = i;
+ || (j == CLASS_cntrl && iscntrl(i))
+ ) {
+ buffer[pos++] = i;
+ }
+ }
}
if (j == CLASS_xdigit) {
for (i = 'A'; i <= 'F'; i++) {
- *buffer++ = i;
- *buffer++ = i | 0x20;
+ buffer[pos + 6] = i | 0x20;
+ buffer[pos++] = i;
}
+ pos += 6;
}
- if (j == CLASS_invalid) {
- *buffer++ = '[';
- *buffer++ = ':';
- continue;
- }
- break;
+ continue;
}
/* "[xyz...", i=x, arg points to y */
if (ENABLE_FEATURE_TR_EQUIV && i == '=') { /* [=CHAR=] */
- *buffer++ = *arg; /* copy CHAR */
- if (!*arg || arg[1] != '=' || arg[2] != ']')
+ buffer[pos++] = *arg; /* copy CHAR */
+ if (!arg[0] || arg[1] != '=' || arg[2] != ']')
bb_show_usage();
arg += 3; /* skip CHAR=] */
continue;
}
- /* The rest of [xyz... cases is treated as normal
- * string, '[' has no special meaning here:
+ /* The rest of "[xyz..." cases is treated as normal
+ * string, "[" has no special meaning here:
* tr "[a-z]" "[A-Z]" can be written as tr "a-z" "A-Z",
* also try tr "[a-z]" "_A-Z+" and you'll see that
* [] is not special here.
*/
- *buffer++ = '[';
- arg--; /* points to x */
- continue;
+ skip_bracket:
+ arg -= 2; /* points to "[" in "[xyz..." */
}
- *buffer++ = *arg++;
+ buffer[pos++] = *arg++;
}
- return (buffer - buffer_start);
+ return pos;
}
+/* NB: buffer is guaranteed to be at least TR_BUFSIZE
+ * (which is >= ASCII) big.
+ */
static int complement(char *buffer, int buffer_len)
{
- int ch, j, len;
- char conv[ASCII + 2];
+ int len;
+ char conv[ASCII];
+ unsigned char ch;
len = 0;
- for (ch = '\0'; ch <= ASCII; ch++) {
- for (j = 0; j < buffer_len; j++)
- if (buffer[j] == ch)
- goto next_ch;
- /* Didn't find it */
- conv[len++] = (char) ch;
- next_ch:
- continue;
+ ch = '\0';
+ while (1) {
+ if (memchr(buffer, ch, buffer_len) == NULL)
+ conv[len++] = ch;
+ if (++ch == '\0')
+ break;
}
memcpy(buffer, conv, len);
return len;
@@ -190,54 +213,56 @@ int tr_main(int argc UNUSED_PARAM, char **argv)
size_t in_index, out_index;
unsigned last = UCHAR_MAX + 1; /* not equal to any char */
unsigned char coded, c;
- unsigned char *output = xmalloc(BUFSIZ);
- char *vector = xzalloc((ASCII+1) * 3);
- char *invec = vector + (ASCII+1);
- char *outvec = vector + (ASCII+1) * 2;
+ char *str1 = xmalloc(TR_BUFSIZ);
+ char *str2 = xmalloc(TR_BUFSIZ);
+ int str2_length;
+ int str1_length;
+ char *vector = xzalloc(ASCII * 3);
+ char *invec = vector + ASCII;
+ char *outvec = vector + ASCII * 2;
#define TR_OPT_complement (1 << 0)
#define TR_OPT_delete (1 << 1)
#define TR_OPT_squeeze_reps (1 << 2)
- flags = getopt32(argv, "+cds"); /* '+': stop at first non-option */
- argv += optind;
-
- for (i = 0; i <= ASCII; i++) {
+ for (i = 0; i < ASCII; i++) {
vector[i] = i;
/*invec[i] = outvec[i] = FALSE; - done by xzalloc */
}
-#define tr_buf bb_common_bufsiz1
- if (*argv != NULL) {
- int output_length = 0;
- int input_length;
+ opt_complementary = "-1";
+ flags = getopt32(argv, "+cds"); /* '+': stop at first non-option */
+ argv += optind;
- input_length = expand(*argv++, tr_buf);
- if (flags & TR_OPT_complement)
- input_length = complement(tr_buf, input_length);
- if (*argv) {
- if (argv[0][0] == '\0')
- bb_error_msg_and_die("STRING2 cannot be empty");
- output_length = expand(*argv, (char *)output);
- map(vector, (unsigned char *)tr_buf, input_length, output, output_length);
- }
- for (i = 0; i < input_length; i++)
- invec[(unsigned char)tr_buf[i]] = TRUE;
- for (i = 0; i < output_length; i++)
- outvec[output[i]] = TRUE;
+ str1_length = expand(*argv++, &str1);
+ str2_length = 0;
+ if (flags & TR_OPT_complement)
+ str1_length = complement(str1, str1_length);
+ if (*argv) {
+ if (argv[0][0] == '\0')
+ bb_error_msg_and_die("STRING2 cannot be empty");
+ str2_length = expand(*argv, &str2);
+ map(vector, str1, str1_length,
+ str2, str2_length);
}
+ for (i = 0; i < str1_length; i++)
+ invec[(unsigned char)(str1[i])] = TRUE;
+ for (i = 0; i < str2_length; i++)
+ outvec[(unsigned char)(str2[i])] = TRUE;
goto start_from;
+ /* In this loop, str1 space is reused as input buffer,
+ * str2 - as output one. */
for (;;) {
/* If we're out of input, flush output and read more input. */
if ((ssize_t)in_index == read_chars) {
if (out_index) {
- xwrite(STDOUT_FILENO, (char *)output, out_index);
+ xwrite(STDOUT_FILENO, str2, out_index);
start_from:
out_index = 0;
}
- read_chars = safe_read(STDIN_FILENO, tr_buf, BUFSIZ);
+ read_chars = safe_read(STDIN_FILENO, str1, TR_BUFSIZ);
if (read_chars <= 0) {
if (read_chars < 0)
bb_perror_msg_and_die(bb_msg_read_error);
@@ -245,14 +270,16 @@ int tr_main(int argc UNUSED_PARAM, char **argv)
}
in_index = 0;
}
- c = tr_buf[in_index++];
+ c = str1[in_index++];
if ((flags & TR_OPT_delete) && invec[c])
continue;
coded = vector[c];
if ((flags & TR_OPT_squeeze_reps) && last == coded
- && (invec[c] || outvec[coded]))
+ && (invec[c] || outvec[coded])
+ ) {
continue;
- output[out_index++] = last = coded;
+ }
+ str2[out_index++] = last = coded;
}
return EXIT_SUCCESS;