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sed: understand \n,\r and \t in i and a commands. Closes 8871

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2016-04-24 16:18:03 +02:00
parent 4c8fa34417
commit cbdff15bb7
2 changed files with 43 additions and 13 deletions
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38
editors/sed.c
View File

@ -218,23 +218,33 @@ static void cleanup_outname(void)
/* strcpy, replacing "\from" with 'to'. If to is NUL, replacing "\any" with 'any' */
static void parse_escapes(char *dest, const char *string, int len, char from, char to)
static unsigned parse_escapes(char *dest, const char *string, int len, char from, char to)
{
char *d = dest;
int i = 0;
if (len == -1)
len = strlen(string);
while (i < len) {
if (string[i] == '\\') {
if (!to || string[i+1] == from) {
*dest++ = to ? to : string[i+1];
if ((*d = to ? to : string[i+1]) == '\0')
return d - dest;
i += 2;
d++;
continue;
}
*dest++ = string[i++];
i++; /* skip backslash in string[] */
*d++ = '\\';
/* fall through: copy next char verbatim */
}
/* TODO: is it safe wrt a string with trailing '\\' ? */
*dest++ = string[i++];
if ((*d = string[i++]) == '\0')
return d - dest;
d++;
}
*dest = '\0';
*d = '\0';
return d - dest;
}
static char *copy_parsing_escapes(const char *string, int len)
@ -245,9 +255,8 @@ static char *copy_parsing_escapes(const char *string, int len)
/* sed recognizes \n */
/* GNU sed also recognizes \t and \r */
for (s = "\nn\tt\rr"; *s; s += 2) {
parse_escapes(dest, string, len, s[1], s[0]);
len = parse_escapes(dest, string, len, s[1], s[0]);
string = dest;
len = strlen(dest);
}
return dest;
}
@ -516,6 +525,8 @@ static const char *parse_cmd_args(sed_cmd_t *sed_cmd, const char *cmdstr)
}
/* handle edit cmds: (a)ppend, (i)nsert, and (c)hange */
else if (idx <= IDX_c) { /* a,i,c */
unsigned len;
if (idx < IDX_c) { /* a,i */
if (sed_cmd->end_line || sed_cmd->end_match)
bb_error_msg_and_die("command '%c' uses only one address", sed_cmd->cmd);
@ -529,10 +540,11 @@ static const char *parse_cmd_args(sed_cmd_t *sed_cmd, const char *cmdstr)
break;
cmdstr++;
}
sed_cmd->string = xstrdup(cmdstr);
len = strlen(cmdstr);
sed_cmd->string = copy_parsing_escapes(cmdstr, len);
cmdstr += len;
/* "\anychar" -> "anychar" */
parse_escapes(sed_cmd->string, sed_cmd->string, strlen(cmdstr), '\0', '\0');
cmdstr += strlen(cmdstr);
parse_escapes(sed_cmd->string, sed_cmd->string, -1, '\0', '\0');
}
/* handle file cmds: (r)ead */
else if (idx <= IDX_w) { /* r,w */
@ -564,8 +576,8 @@ static const char *parse_cmd_args(sed_cmd_t *sed_cmd, const char *cmdstr)
cmdstr += parse_regex_delim(cmdstr, &match, &replace)+1;
/* \n already parsed, but \delimiter needs unescaping. */
parse_escapes(match, match, strlen(match), i, i);
parse_escapes(replace, replace, strlen(replace), i, i);
parse_escapes(match, match, -1, i, i);
parse_escapes(replace, replace, -1, i, i);
sed_cmd->string = xzalloc((strlen(match) + 1) * 2);
for (i = 0; match[i] && replace[i]; i++) {

18
testsuite/sed.tests
View File

@ -275,6 +275,24 @@ testing "sed a cmd ended by double backslash" \
| two \\
'
testing "sed a cmd understands \\n,\\t,\\r" \
"sed '/1/a\\\\t\\rzero\\none\\\\ntwo\\\\\\nthree'" \
"\
line1
\t\rzero
one\\\\ntwo\\
three
" "" "line1\n"
testing "sed i cmd understands \\n,\\t,\\r" \
"sed '/1/i\\\\t\\rzero\\none\\\\ntwo\\\\\\nthree'" \
"\
\t\rzero
one\\\\ntwo\\
three
line1
" "" "line1\n"
# first three lines are deleted; 4th line is matched and printed by "2,3" and by "4" ranges
testing "sed with N skipping lines past ranges on next cmds" \
"sed -n '1{N;N;d};1p;2,3p;3p;4p'" \