diff options
| -rw-r--r-- | editors/sed.c | 38 | ||||
| -rwxr-xr-x | testsuite/sed.tests | 18 |
2 files changed, 43 insertions, 13 deletions
diff --git a/editors/sed.c b/editors/sed.c index 6bce25b..7f18fd0 100644 --- a/editors/sed.c +++ b/editors/sed.c @@ -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++) { diff --git a/testsuite/sed.tests b/testsuite/sed.tests index 5d2356b..c4b6fa2 100755 --- a/testsuite/sed.tests +++ b/testsuite/sed.tests @@ -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'" \ |