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histexpand.cc
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histexpand.cc
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/* histexpand.c -- history expansion. */
/* Copyright (C) 1989-2018 Free Software Foundation, Inc.
This file contains the GNU History Library (History), a set of
routines for managing the text of previously typed lines.
History is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
History is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with History. If not, see <http://www.gnu.org/licenses/>.
*/
#define READLINE_LIBRARY
#if defined(HAVE_CONFIG_H)
#include <config.hh>
#endif
#include <stdio.h>
#if defined(HAVE_STDLIB_H)
#include <stdlib.h>
#else
#include "ansi_stdlib.hh"
#endif /* HAVE_STDLIB_H */
#if defined(HAVE_UNISTD_H)
#ifndef _MINIX
#include <sys/types.h>
#endif
#include <unistd.h>
#endif
#include "rlmbutil.hh"
#include "chardefs.hh"
#include "histlib.hh"
#include "history.hh"
#include "rlshell.hh"
#include "xmalloc.hh"
#define HISTORY_WORD_DELIMITERS " \t\n;&()|<>"
#define HISTORY_QUOTE_CHARACTERS "\"'`"
#define HISTORY_EVENT_DELIMITERS "^$*%-"
#define slashify_in_quotes "\\`\"$"
#define fielddelim(c) (whitespace(c) || (c) == '\n')
typedef int _hist_search_func_t PARAMS((const char*, int));
static char error_pointer;
static char* subst_lhs;
static char* subst_rhs;
static int subst_lhs_len;
static int subst_rhs_len;
/* Characters that delimit history event specifications and separate event
specifications from word designators. Static for now */
static char* history_event_delimiter_chars= HISTORY_EVENT_DELIMITERS;
static char* get_history_word_specifier PARAMS((char*, char*, int*));
static int history_tokenize_word PARAMS((const char*, int));
static char** history_tokenize_internal PARAMS((const char*, int, int*));
static char* history_substring PARAMS((const char*, int, int));
static void freewords PARAMS((char**, int));
static char* history_find_word PARAMS((char*, int));
static char* quote_breaks PARAMS((char*));
/* Variables exported by this file. */
/* The character that represents the start of a history expansion
request. This is usually `!'. */
char history_expansion_char= '!';
/* The character that invokes word substitution if found at the start of
a line. This is usually `^'. */
char history_subst_char= '^';
/* During tokenization, if this character is seen as the first character
of a word, then it, and all subsequent characters upto a newline are
ignored. For a Bourne shell, this should be '#'. Bash special cases
the interactive comment character to not be a comment delimiter. */
char history_comment_char= '\0';
/* The list of characters which inhibit the expansion of text if found
immediately following history_expansion_char. */
char* history_no_expand_chars= " \t\n\r=";
/* If set to a non-zero value, single quotes inhibit history expansion.
The default is 0. */
int history_quotes_inhibit_expansion= 0;
/* Used to split words by history_tokenize_internal. */
char* history_word_delimiters= HISTORY_WORD_DELIMITERS;
/* If set, this points to a function that is called to verify that a
particular history expansion should be performed. */
rl_linebuf_func_t* history_inhibit_expansion_function;
int history_quoting_state= 0;
/* **************************************************************** */
/* */
/* History Expansion */
/* */
/* **************************************************************** */
/* Hairy history expansion on text, not tokens. This is of general
use, and thus belongs in this library. */
/* The last string searched for by a !?string? search. */
static char* search_string;
/* The last string matched by a !?string? search. */
static char* search_match;
/* Return the event specified at TEXT + OFFSET modifying OFFSET to
point to after the event specifier. Just a pointer to the history
line is returned; NULL is returned in the event of a bad specifier.
You pass STRING with *INDEX equal to the history_expansion_char that
begins this specification.
DELIMITING_QUOTE is a character that is allowed to end the string
specification for what to search for in addition to the normal
characters `:', ` ', `\t', `\n', and sometimes `?'.
So you might call this function like:
line = get_history_event ("!echo:p", &index, 0); */
char* get_history_event(const char* string,
int* caller_index,
int delimiting_quote)
{
int i;
char c;
HIST_ENTRY* entry;
int which, sign, local_index, substring_okay;
_hist_search_func_t* search_func;
char* temp;
/* The event can be specified in a number of ways.
!! the previous command
!n command line N
!-n current command-line minus N
!str the most recent command starting with STR
!?str[?]
the most recent command containing STR
All values N are determined via HISTORY_BASE. */
i= *caller_index;
if (string[i] != history_expansion_char)
return ((char*)NULL);
/* Move on to the specification. */
i++;
sign = 1;
substring_okay= 0;
#define RETURN_ENTRY(e, w) \
return ((e= history_get(w)) ? e->line : (char*)NULL)
/* Handle !! case. */
if (string[i] == history_expansion_char)
{
i++;
which = history_base + (history_length - 1);
*caller_index= i;
RETURN_ENTRY(entry, which);
}
/* Hack case of numeric line specification. */
if (string[i] == '-')
{
sign= -1;
i++;
}
if (_rl_digit_p(string[i]))
{
/* Get the extent of the digits and compute the value. */
for (which= 0; _rl_digit_p(string[i]); i++)
which= (which * 10) + _rl_digit_value(string[i]);
*caller_index= i;
if (sign < 0)
which= (history_length + history_base) - which;
RETURN_ENTRY(entry, which);
}
/* This must be something to search for. If the spec begins with
a '?', then the string may be anywhere on the line. Otherwise,
the string must be found at the start of a line. */
if (string[i] == '?')
{
substring_okay++;
i++;
}
/* Only a closing `?' or a newline delimit a substring search string. */
for (local_index= i; (c= string[i]); i++)
{
#if defined(HANDLE_MULTIBYTE)
if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
{
int v;
mbstate_t ps;
memset(&ps, 0, sizeof(mbstate_t));
/* These produce warnings because we're passing a const string to a
function that takes a non-const string. */
_rl_adjust_point((char*)string, i, &ps);
if ((v= _rl_get_char_len((char*)string + i, &ps)) > 1)
{
i+= v - 1;
continue;
}
}
#endif /* HANDLE_MULTIBYTE */
if ((!substring_okay && (whitespace(c) || c == ':' ||
(history_event_delimiter_chars &&
member(c, history_event_delimiter_chars)) ||
(history_search_delimiter_chars &&
member(c, history_search_delimiter_chars)) ||
string[i] == delimiting_quote)) ||
string[i] == '\n' || (substring_okay && string[i] == '?'))
break;
}
which= i - local_index;
temp = (char*)xmalloc(1 + which);
if (which)
strncpy(temp, string + local_index, which);
temp[which]= '\0';
if (substring_okay && string[i] == '?')
i++;
*caller_index= i;
#define FAIL_SEARCH() \
do \
{ \
history_offset= history_length; \
xfree(temp); \
return (char*)NULL; \
} while (0)
/* If there is no search string, try to use the previous search string,
if one exists. If not, fail immediately. */
if (*temp == '\0' && substring_okay)
{
if (search_string)
{
xfree(temp);
temp= savestring(search_string);
}
else
FAIL_SEARCH();
}
search_func= substring_okay ? history_search : history_search_prefix;
while (1)
{
local_index= (*search_func)(temp, -1);
if (local_index < 0)
FAIL_SEARCH();
if (local_index == 0 || substring_okay)
{
entry= current_history();
if (entry == 0)
FAIL_SEARCH();
history_offset= history_length;
/* If this was a substring search, then remember the
string that we matched for word substitution. */
if (substring_okay)
{
free(search_string);
search_string= temp;
free(search_match);
search_match= history_find_word(entry->line, local_index);
}
else
xfree(temp);
return (entry->line);
}
if (history_offset)
history_offset--;
else
FAIL_SEARCH();
}
#undef FAIL_SEARCH
#undef RETURN_ENTRY
}
/* Function for extracting single-quoted strings. Used for inhibiting
history expansion within single quotes. */
/* Extract the contents of STRING as if it is enclosed in single quotes.
SINDEX, when passed in, is the offset of the character immediately
following the opening single quote; on exit, SINDEX is left pointing
to the closing single quote. FLAGS currently used to allow backslash
to escape a single quote (e.g., for bash $'...'). */
static void hist_string_extract_single_quoted(char* string,
int* sindex,
int flags)
{
int i;
for (i= *sindex; string[i] && string[i] != '\''; i++)
{
if ((flags & 1) && string[i] == '\\' && string[i + 1])
i++;
}
*sindex= i;
}
static char* quote_breaks(char* s)
{
char *p, *r;
char* ret;
int len= 3;
for (p= s; p && *p; p++, len++)
{
if (*p == '\'')
len+= 3;
else if (whitespace(*p) || *p == '\n')
len+= 2;
}
r= ret= (char*)xmalloc(len);
*r++ = '\'';
for (p= s; p && *p;)
{
if (*p == '\'')
{
*r++= '\'';
*r++= '\\';
*r++= '\'';
*r++= '\'';
p++;
}
else if (whitespace(*p) || *p == '\n')
{
*r++= '\'';
*r++= *p++;
*r++= '\'';
}
else
*r++= *p++;
}
*r++= '\'';
*r = '\0';
return ret;
}
static char* hist_error(char* s, int start, int current, int errtype)
{
char* temp;
const char* emsg;
int ll, elen;
ll= current - start;
switch (errtype)
{
case EVENT_NOT_FOUND:
emsg= "event not found";
elen= 15;
break;
case BAD_WORD_SPEC:
emsg= "bad word specifier";
elen= 18;
break;
case SUBST_FAILED:
emsg= "substitution failed";
elen= 19;
break;
case BAD_MODIFIER:
emsg= "unrecognized history modifier";
elen= 29;
break;
case NO_PREV_SUBST:
emsg= "no previous substitution";
elen= 24;
break;
default:
emsg= "unknown expansion error";
elen= 23;
break;
}
temp= (char*)xmalloc(ll + elen + 3);
strncpy(temp, s + start, ll);
temp[ll] = ':';
temp[ll + 1]= ' ';
strcpy(temp + ll + 2, emsg);
return (temp);
}
/* Get a history substitution string from STR starting at *IPTR
and return it. The length is returned in LENPTR.
A backslash can quote the delimiter. If the string is the
empty string, the previous pattern is used. If there is
no previous pattern for the lhs, the last history search
string is used.
If IS_RHS is 1, we ignore empty strings and set the pattern
to "" anyway. subst_lhs is not changed if the lhs is empty;
subst_rhs is allowed to be set to the empty string. */
static char* get_subst_pattern(char* str,
int* iptr,
int delimiter,
int is_rhs,
int* lenptr)
{
int si, i, j, k;
char* s;
#if defined(HANDLE_MULTIBYTE)
mbstate_t ps;
#endif
s= (char*)NULL;
i= *iptr;
#if defined(HANDLE_MULTIBYTE)
memset(&ps, 0, sizeof(mbstate_t));
_rl_adjust_point(str, i, &ps);
#endif
for (si= i; str[si] && str[si] != delimiter; si++)
#if defined(HANDLE_MULTIBYTE)
if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
{
int v;
if ((v= _rl_get_char_len(str + si, &ps)) > 1)
si+= v - 1;
else if (str[si] == '\\' && str[si + 1] == delimiter)
si++;
}
else
#endif /* HANDLE_MULTIBYTE */
if (str[si] == '\\' && str[si + 1] == delimiter)
si++;
if (si > i || is_rhs)
{
s= (char*)xmalloc(si - i + 1);
for (j= 0, k= i; k < si; j++, k++)
{
/* Remove a backslash quoting the search string delimiter. */
if (str[k] == '\\' && str[k + 1] == delimiter)
k++;
s[j]= str[k];
}
s[j]= '\0';
if (lenptr)
*lenptr= j;
}
i= si;
if (str[i])
i++;
*iptr= i;
return s;
}
static void postproc_subst_rhs(void)
{
char* _new;
int i, j, new_size;
_new= (char*)xmalloc(new_size= subst_rhs_len + subst_lhs_len);
for (i= j= 0; i < subst_rhs_len; i++)
{
if (subst_rhs[i] == '&')
{
if (j + subst_lhs_len >= new_size)
_new= (char*)xrealloc(_new,
(new_size= new_size * 2 + subst_lhs_len));
strcpy(_new + j, subst_lhs);
j+= subst_lhs_len;
}
else
{
/* a single backslash protects the `&' from lhs interpolation */
if (subst_rhs[i] == '\\' && subst_rhs[i + 1] == '&')
i++;
if (j >= new_size)
_new= (char*)xrealloc(_new, new_size*= 2);
_new[j++]= subst_rhs[i];
}
}
_new[j]= '\0';
xfree(subst_rhs);
subst_rhs = _new;
subst_rhs_len= j;
}
/* Expand the bulk of a history specifier starting at STRING[START].
Returns 0 if everything is OK, -1 if an error occurred, and 1
if the `p' modifier was supplied and the caller should just print
the returned string. Returns the _new index into string in
*END_INDEX_PTR, and the expanded specifier in *RET_STRING. */
/* need current line for !# */
static int history_expand_internal(char* string,
int start,
int qc,
int* end_index_ptr,
char** ret_string,
char* current_line)
{
int i, n, starting_index;
int substitute_globally, subst_bywords, want_quotes, print_only;
char *event, *temp, *result, *tstr, *t, c, *word_spec;
int result_len;
#if defined(HANDLE_MULTIBYTE)
mbstate_t ps;
memset(&ps, 0, sizeof(mbstate_t));
#endif
result= (char*)xmalloc(result_len= 128);
i= start;
/* If it is followed by something that starts a word specifier,
then !! is implied as the event specifier. */
if (member(string[i + 1], ":$*%^"))
{
char fake_s[3];
int fake_i= 0;
i++;
fake_s[0]= fake_s[1]= history_expansion_char;
fake_s[2] = '\0';
event = get_history_event(fake_s, &fake_i, 0);
}
else if (string[i + 1] == '#')
{
i+= 2;
event= current_line;
}
else
event= get_history_event(string, &i, qc);
if (event == 0)
{
*ret_string= hist_error(string, start, i, EVENT_NOT_FOUND);
xfree(result);
return (-1);
}
/* If a word specifier is found, then do what that requires. */
starting_index= i;
word_spec = get_history_word_specifier(string, event, &i);
/* There is no such thing as a `malformed word specifier'. However,
it is possible for a specifier that has no match. In that case,
we complain. */
if (word_spec == (char*)&error_pointer)
{
*ret_string= hist_error(string, starting_index, i, BAD_WORD_SPEC);
xfree(result);
return (-1);
}
/* If no word specifier, than the thing of interest was the event. */
temp= word_spec ? savestring(word_spec) : savestring(event);
free(word_spec);
/* Perhaps there are other modifiers involved. Do what they say. */
want_quotes= substitute_globally= subst_bywords= print_only= 0;
starting_index = i;
while (string[i] == ':')
{
c= string[i + 1];
if (c == 'g' || c == 'a')
{
substitute_globally= 1;
i++;
c= string[i + 1];
}
else if (c == 'G')
{
subst_bywords= 1;
i++;
c= string[i + 1];
}
switch (c)
{
default:
*ret_string= hist_error(string, i + 1, i + 2, BAD_MODIFIER);
xfree(result);
xfree(temp);
return -1;
case 'q':
want_quotes= 'q';
break;
case 'x':
want_quotes= 'x';
break;
/* :p means make this the last executed line. So we
return an error state after adding this line to the
history. */
case 'p':
print_only++;
break;
/* :t discards all but the last part of the pathname. */
case 't':
tstr= strrchr(temp, '/');
if (tstr)
{
tstr++;
t= savestring(tstr);
xfree(temp);
temp= t;
}
break;
/* :h discards the last part of a pathname. */
case 'h':
tstr= strrchr(temp, '/');
if (tstr)
*tstr= '\0';
break;
/* :r discards the suffix. */
case 'r':
tstr= strrchr(temp, '.');
if (tstr)
*tstr= '\0';
break;
/* :e discards everything but the suffix. */
case 'e':
tstr= strrchr(temp, '.');
if (tstr)
{
t= savestring(tstr);
xfree(temp);
temp= t;
}
break;
/* :s/this/that substitutes `that' for the first
occurrence of `this'. :gs/this/that substitutes `that'
for each occurrence of `this'. :& repeats the last
substitution. :g& repeats the last substitution
globally. */
case '&':
case 's':
{
char* new_event;
int delimiter, failed, si, l_temp, ws, we;
if (c == 's')
{
if (i + 2 < (int)strlen(string))
{
#if defined(HANDLE_MULTIBYTE)
if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
{
_rl_adjust_point(string, i + 2, &ps);
if (_rl_get_char_len(string + i + 2, &ps) > 1)
delimiter= 0;
else
delimiter= string[i + 2];
}
else
#endif /* HANDLE_MULTIBYTE */
delimiter= string[i + 2];
}
else
break; /* no search delimiter */
i+= 3;
t= get_subst_pattern(string, &i, delimiter, 0, &subst_lhs_len);
/* An empty substitution lhs with no previous substitution
uses the last search string as the lhs. */
if (t)
{
free(subst_lhs);
subst_lhs= t;
}
else if (!subst_lhs)
{
if (search_string && *search_string)
{
subst_lhs = savestring(search_string);
subst_lhs_len= strlen(subst_lhs);
}
else
{
subst_lhs = (char*)NULL;
subst_lhs_len= 0;
}
}
free(subst_rhs);
subst_rhs= get_subst_pattern(
string, &i, delimiter, 1, &subst_rhs_len);
/* If `&' appears in the rhs, it's supposed to be replaced
with the lhs. */
if (member('&', subst_rhs))
postproc_subst_rhs();
}
else
i+= 2;
/* If there is no lhs, the substitution can't succeed. */
if (subst_lhs_len == 0)
{
*ret_string=
hist_error(string, starting_index, i, NO_PREV_SUBST);
xfree(result);
xfree(temp);
return -1;
}
l_temp= strlen(temp);
/* Ignore impossible cases. */
if (subst_lhs_len > l_temp)
{
*ret_string= hist_error(string, starting_index, i, SUBST_FAILED);
xfree(result);
xfree(temp);
return (-1);
}
/* Find the first occurrence of THIS in TEMP. */
/* Substitute SUBST_RHS for SUBST_LHS in TEMP. There are three
cases to consider:
1. substitute_globally == subst_bywords == 0
2. substitute_globally == 1 && subst_bywords == 0
3. substitute_globally == 0 && subst_bywords == 1
In the first case, we substitute for the first occurrence only.
In the second case, we substitute for every occurrence.
In the third case, we tokenize into words and substitute the
first occurrence of each word. */
si= we= 0;
for (failed= 1; (si + subst_lhs_len) <= l_temp; si++)
{
/* First skip whitespace and find word boundaries if
we're past the end of the word boundary we found
the last time. */
if (subst_bywords && si > we)
{
for (; temp[si] && fielddelim(temp[si]); si++)
;
ws= si;
we= history_tokenize_word(temp, si);
}
if (STREQN(temp + si, subst_lhs, subst_lhs_len))
{
int len = subst_rhs_len - subst_lhs_len + l_temp;
new_event= (char*)xmalloc(1 + len);
strncpy(new_event, temp, si);
strncpy(new_event + si, subst_rhs, subst_rhs_len);
strncpy(new_event + si + subst_rhs_len,
temp + si + subst_lhs_len,
l_temp - (si + subst_lhs_len));
new_event[len]= '\0';
xfree(temp);
temp= new_event;
failed= 0;
if (substitute_globally)
{
/* Reported to fix a bug that causes it to skip every
other match when matching a single character. Was
si += subst_rhs_len previously. */
si+= subst_rhs_len - 1;
l_temp= strlen(temp);
substitute_globally++;
continue;
}
else if (subst_bywords)
{
si = we;
l_temp= strlen(temp);
continue;
}
else
break;
}
}
if (substitute_globally > 1)
{
substitute_globally= 0;
continue; /* don't want to increment i */
}
if (failed == 0)
continue; /* don't want to increment i */
*ret_string= hist_error(string, starting_index, i, SUBST_FAILED);
xfree(result);
xfree(temp);
return (-1);
}
}
i+= 2;
}
/* Done with modifiers. */
/* Believe it or not, we have to back the pointer up by one. */
--i;
if (want_quotes)
{
char* x;
if (want_quotes == 'q')
x= sh_single_quote(temp);
else if (want_quotes == 'x')
x= quote_breaks(temp);
else
x= savestring(temp);
xfree(temp);
temp= x;
}
n= strlen(temp);
if (n >= result_len)
result= (char*)xrealloc(result, n + 2);
strcpy(result, temp);
xfree(temp);
*end_index_ptr= i;
*ret_string = result;
return (print_only);
}
/* Expand the string STRING, placing the result into OUTPUT, a pointer
to a string. Returns:
-1) If there was an error in expansion.
0) If no expansions took place (or, if the only change in
the text was the de-slashifying of the history expansion
character)
1) If expansions did take place
2) If the `p' modifier was given and the caller should print the result
If an error occurred in expansion, then OUTPUT contains a descriptive
error message. */
#define ADD_STRING(s) \
do \
{ \
int sl= strlen(s); \
j+= sl; \
if (j >= result_len) \
{ \
while (j >= result_len) \
result_len+= 128; \
result= (char*)xrealloc(result, result_len); \
} \
strcpy(result + j - sl, s); \
} while (0)
#define ADD_CHAR(c) \
do \
{ \
if (j >= result_len - 1) \
result= (char*)xrealloc(result, result_len+= 64); \
result[j++]= c; \
result[j] = '\0'; \
} while (0)
int history_expand(char* hstring, char** output)
{
int j;
int i, r, l, passc, cc, modified, eindex, only_printing, dquote, squote,
flag;
char* string;
/* The output string, and its length. */
int result_len;
char* result;
#if defined(HANDLE_MULTIBYTE)
char mb[MB_LEN_MAX];
mbstate_t ps;
#endif
/* Used when adding the string. */
char* temp;
if (output == 0)
return 0;
/* Setting the history expansion character to 0 inhibits all
history expansion. */
if (history_expansion_char == 0)
{
*output= savestring(hstring);
return (0);
}
/* Prepare the buffer for printing error messages. */
result = (char*)xmalloc(result_len= 256);
result[0]= '\0';
only_printing= modified= 0;
l = strlen(hstring);
/* Grovel the string. Only backslash and single quotes can quote the
history escape character. We also handle arg specifiers. */
/* Before we grovel forever, see if the history_expansion_char appears
anywhere within the text. */
/* The quick substitution character is a history expansion all right.
That is to say, "^this^that^" is equivalent to "!!:s^this^that^", and
in fact, that is the substitution that we do. */
if (hstring[0] == history_subst_char)
{
string= (char*)xmalloc(l + 5);
string[0]= string[1]= history_expansion_char;
string[2] = ':';
string[3] = 's';
strcpy(string + 4, hstring);
l+= 4;
}
else
{
#if defined(HANDLE_MULTIBYTE)
memset(&ps, 0, sizeof(mbstate_t));
#endif
string= hstring;
/* If not quick substitution, still maybe have to do expansion. */
/* `!' followed by one of the characters in history_no_expand_chars
is NOT an expansion. */
dquote= history_quoting_state == '"';
squote= history_quoting_state == '\'';
/* If the calling application tells us we are already reading a
single-quoted string, consume the rest of the string right now
and then go on. */
i= 0;
if (squote && history_quotes_inhibit_expansion)
{
hist_string_extract_single_quoted(string, &i, 0);
squote= 0;
if (string[i])
i++;
}
for (; string[i]; i++)
{
#if defined(HANDLE_MULTIBYTE)
if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
{
int v;
v= _rl_get_char_len(string + i, &ps);