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| Current File : //usr/src/contrib/tcsh/tw.comp.c |
/* $Header: /p/tcsh/cvsroot/tcsh/tw.comp.c,v 1.42 2007/10/01 21:52:00 christos Exp $ */
/*
* tw.comp.c: File completion builtin
*/
/*-
* Copyright (c) 1980, 1991 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "sh.h"
RCSID("$tcsh: tw.comp.c,v 1.42 2007/10/01 21:52:00 christos Exp $")
#include "tw.h"
#include "ed.h"
#include "tc.h"
/* #define TDEBUG */
struct varent completions;
static int tw_result (const Char *, Char **);
static Char **tw_find (Char *, struct varent *, int);
static Char *tw_tok (Char *);
static int tw_pos (Char *, int);
static void tw_pr (Char **);
static int tw_match (const Char *, const Char *);
static void tw_prlist (struct varent *);
static const Char *tw_dollar (const Char *,Char **, size_t, Char **,
Char, const char *);
/* docomplete():
* Add or list completions in the completion list
*/
/*ARGSUSED*/
void
docomplete(Char **v, struct command *t)
{
struct varent *vp;
Char *p;
Char **pp;
USE(t);
v++;
p = *v++;
if (p == 0)
tw_prlist(&completions);
else if (*v == 0) {
vp = adrof1(strip(p), &completions);
if (vp && vp->vec)
tw_pr(vp->vec), xputchar('\n');
else
{
#ifdef TDEBUG
xprintf("tw_find(%s) \n", short2str(strip(p)));
#endif /* TDEBUG */
pp = tw_find(strip(p), &completions, FALSE);
if (pp)
tw_pr(pp), xputchar('\n');
}
}
else
set1(strip(p), saveblk(v), &completions, VAR_READWRITE);
} /* end docomplete */
/* douncomplete():
* Remove completions from the completion list
*/
/*ARGSUSED*/
void
douncomplete(Char **v, struct command *t)
{
USE(t);
unset1(v, &completions);
} /* end douncomplete */
/* tw_prlist():
* Pretty print a list of variables
*/
static void
tw_prlist(struct varent *p)
{
struct varent *c;
for (;;) {
while (p->v_left)
p = p->v_left;
x:
if (p->v_parent == 0) /* is it the header? */
break;
if (setintr) {
int old_pintr_disabled;
pintr_push_enable(&old_pintr_disabled);
cleanup_until(&old_pintr_disabled);
}
xprintf("%s\t", short2str(p->v_name));
if (p->vec)
tw_pr(p->vec);
xputchar('\n');
if (p->v_right) {
p = p->v_right;
continue;
}
do {
c = p;
p = p->v_parent;
} while (p->v_right == c);
goto x;
}
} /* end tw_prlist */
/* tw_pr():
* Pretty print a completion, adding single quotes around
* a completion argument and collapsing multiple spaces to one.
*/
static void
tw_pr(Char **cmp)
{
int sp, osp;
Char *ptr;
for (; *cmp; cmp++) {
xputchar('\'');
for (osp = 0, ptr = *cmp; *ptr; ptr++) {
sp = Isspace(*ptr);
if (sp && osp)
continue;
xputwchar(*ptr);
osp = sp;
}
xputchar('\'');
if (cmp[1])
xputchar(' ');
}
} /* end tw_pr */
/* tw_find():
* Find the first matching completion.
* For commands we only look at names that start with -
*/
static Char **
tw_find(Char *nam, struct varent *vp, int cmd)
{
Char **rv;
for (vp = vp->v_left; vp; vp = vp->v_right) {
if (vp->v_left && (rv = tw_find(nam, vp, cmd)) != NULL)
return rv;
if (cmd) {
if (vp->v_name[0] != '-')
continue;
if (Gmatch(nam, &vp->v_name[1]) && vp->vec != NULL)
return vp->vec;
}
else
if (Gmatch(nam, vp->v_name) && vp->vec != NULL)
return vp->vec;
}
return NULL;
} /* end tw_find */
/* tw_pos():
* Return true if the position is within the specified range
*/
static int
tw_pos(Char *ran, int wno)
{
Char *p;
if (ran[0] == '*' && ran[1] == '\0')
return 1;
for (p = ran; *p && *p != '-'; p++)
continue;
if (*p == '\0') /* range == <number> */
return wno == getn(ran);
if (ran == p) /* range = - <number> */
return wno <= getn(&ran[1]);
*p++ = '\0';
if (*p == '\0') /* range = <number> - */
return getn(ran) <= wno;
else /* range = <number> - <number> */
return (getn(ran) <= wno) && (wno <= getn(p));
} /* end tw_pos */
/* tw_tok():
* Return the next word from string, unquoteing it.
*/
static Char *
tw_tok(Char *str)
{
static Char *bf = NULL;
if (str != NULL)
bf = str;
/* skip leading spaces */
for (; *bf && Isspace(*bf); bf++)
continue;
for (str = bf; *bf && !Isspace(*bf); bf++) {
if (ismetahash(*bf))
return INVPTR;
*bf = *bf & ~QUOTE;
}
if (*bf != '\0')
*bf++ = '\0';
return *str ? str : NULL;
} /* end tw_tok */
/* tw_match():
* Match a string against the pattern given.
* and return the number of matched characters
* in a prefix of the string.
*/
static int
tw_match(const Char *str, const Char *pat)
{
const Char *estr;
int rv = Gnmatch(str, pat, &estr);
#ifdef TDEBUG
xprintf("Gnmatch(%s, ", short2str(str));
xprintf("%s, ", short2str(pat));
xprintf("%s) = %d [%d]\n", short2str(estr), rv, estr - str);
#endif /* TDEBUG */
return (int) (rv ? estr - str : -1);
}
/* tw_result():
* Return what the completion action should be depending on the
* string
*/
static int
tw_result(const Char *act, Char **pat)
{
int looking;
static Char* res = NULL;
Char *p;
if (res != NULL)
xfree(res), res = NULL;
switch (act[0] & ~QUOTE) {
case 'X':
looking = TW_COMPLETION;
break;
case 'S':
looking = TW_SIGNAL;
break;
case 'a':
looking = TW_ALIAS;
break;
case 'b':
looking = TW_BINDING;
break;
case 'c':
looking = TW_COMMAND;
break;
case 'C':
looking = TW_PATH | TW_COMMAND;
break;
case 'd':
looking = TW_DIRECTORY;
break;
case 'D':
looking = TW_PATH | TW_DIRECTORY;
break;
case 'e':
looking = TW_ENVVAR;
break;
case 'f':
looking = TW_FILE;
break;
#ifdef COMPAT
case 'p':
#endif /* COMPAT */
case 'F':
looking = TW_PATH | TW_FILE;
break;
case 'g':
looking = TW_GRPNAME;
break;
case 'j':
looking = TW_JOB;
break;
case 'l':
looking = TW_LIMIT;
break;
case 'n':
looking = TW_NONE;
break;
case 's':
looking = TW_SHELLVAR;
break;
case 't':
looking = TW_TEXT;
break;
case 'T':
looking = TW_PATH | TW_TEXT;
break;
case 'v':
looking = TW_VARIABLE;
break;
case 'u':
looking = TW_USER;
break;
case 'x':
looking = TW_EXPLAIN;
break;
case '$':
*pat = res = Strsave(&act[1]);
(void) strip(res);
return(TW_VARLIST);
case '(':
*pat = res = Strsave(&act[1]);
if ((p = Strchr(res, ')')) != NULL)
*p = '\0';
(void) strip(res);
return TW_WORDLIST;
case '`':
res = Strsave(act);
if ((p = Strchr(&res[1], '`')) != NULL)
*++p = '\0';
if (didfds == 0) {
/*
* Make sure that we have some file descriptors to
* play with, so that the processes have at least 0, 1, 2
* open
*/
(void) dcopy(SHIN, 0);
(void) dcopy(SHOUT, 1);
(void) dcopy(SHDIAG, 2);
}
if ((p = globone(res, G_APPEND)) != NULL) {
xfree(res), res = NULL;
*pat = res = Strsave(p);
xfree(p);
return TW_WORDLIST;
}
return TW_ZERO;
default:
stderror(ERR_COMPCOM, short2str(act));
return TW_ZERO;
}
switch (act[1] & ~QUOTE) {
case '\0':
return looking;
case ':':
*pat = res = Strsave(&act[2]);
(void) strip(res);
return looking;
default:
stderror(ERR_COMPCOM, short2str(act));
return TW_ZERO;
}
} /* end tw_result */
/* tw_dollar():
* Expand $<n> args in buffer
*/
static const Char *
tw_dollar(const Char *str, Char **wl, size_t nwl, Char **result, Char sep,
const char *msg)
{
struct Strbuf buf = Strbuf_INIT;
Char *res;
const Char *sp;
for (sp = str; *sp && *sp != sep;)
if (sp[0] == '$' && sp[1] == ':' && Isdigit(sp[sp[2] == '-' ? 3 : 2])) {
int num, neg = 0;
sp += 2;
if (*sp == '-') {
neg = 1;
sp++;
}
for (num = *sp++ - '0'; Isdigit(*sp); num += 10 * num + *sp++ - '0')
continue;
if (neg)
num = nwl - num - 1;
if (num >= 0 && (size_t)num < nwl)
Strbuf_append(&buf, wl[num]);
}
else
Strbuf_append1(&buf, *sp++);
res = Strbuf_finish(&buf);
if (*sp++ == sep) {
*result = res;
return sp;
}
xfree(res);
/* Truncates data if WIDE_STRINGS */
stderror(ERR_COMPMIS, (int)sep, msg, short2str(str));
return --sp;
} /* end tw_dollar */
/* tw_complete():
* Return the appropriate completion for the command
*
* valid completion strings are:
* p/<range>/<completion>/[<suffix>/] positional
* c/<pattern>/<completion>/[<suffix>/] current word ignore pattern
* C/<pattern>/<completion>/[<suffix>/] current word with pattern
* n/<pattern>/<completion>/[<suffix>/] next word
* N/<pattern>/<completion>/[<suffix>/] next-next word
*/
int
tw_complete(const Char *line, Char **word, Char **pat, int looking, eChar *suf)
{
Char *buf, **vec, **wl;
static Char nomatch[2] = { (Char) ~0, 0x00 };
const Char *ptr;
size_t wordno;
int n;
buf = Strsave(line);
cleanup_push(buf, xfree);
/* Single-character words, empty current word, terminating NULL */
wl = xmalloc(((Strlen(line) + 1) / 2 + 2) * sizeof (*wl));
cleanup_push(wl, xfree);
/* find the command */
if ((wl[0] = tw_tok(buf)) == NULL || wl[0] == INVPTR) {
cleanup_until(buf);
return TW_ZERO;
}
/*
* look for hardwired command completions using a globbing
* search and for arguments using a normal search.
*/
if ((vec = tw_find(wl[0], &completions, (looking == TW_COMMAND)))
== NULL) {
cleanup_until(buf);
return looking;
}
/* tokenize the line one more time :-( */
for (wordno = 1; (wl[wordno] = tw_tok(NULL)) != NULL &&
wl[wordno] != INVPTR; wordno++)
continue;
if (wl[wordno] == INVPTR) { /* Found a meta character */
cleanup_until(buf);
return TW_ZERO; /* de-activate completions */
}
#ifdef TDEBUG
{
size_t i;
for (i = 0; i < wordno; i++)
xprintf("'%s' ", short2str(wl[i]));
xprintf("\n");
}
#endif /* TDEBUG */
/* if the current word is empty move the last word to the next */
if (**word == '\0') {
wl[wordno] = *word;
wordno++;
}
wl[wordno] = NULL;
#ifdef TDEBUG
xprintf("\r\n");
xprintf(" w#: %lu\n", (unsigned long)wordno);
xprintf("line: %s\n", short2str(line));
xprintf(" cmd: %s\n", short2str(wl[0]));
xprintf("word: %s\n", short2str(*word));
xprintf("last: %s\n", wordno >= 2 ? short2str(wl[wordno-2]) : "n/a");
xprintf("this: %s\n", wordno >= 1 ? short2str(wl[wordno-1]) : "n/a");
#endif /* TDEBUG */
for (;vec != NULL && (ptr = vec[0]) != NULL; vec++) {
Char *ran, /* The pattern or range X/<range>/XXXX/ */
*com, /* The completion X/XXXXX/<completion>/ */
*pos = NULL; /* scratch pointer */
int cmd, res;
Char sep; /* the command and separator characters */
if (ptr[0] == '\0')
continue;
#ifdef TDEBUG
xprintf("match %s\n", short2str(ptr));
#endif /* TDEBUG */
switch (cmd = ptr[0]) {
case 'N':
pos = (wordno < 3) ? nomatch : wl[wordno - 3];
break;
case 'n':
pos = (wordno < 2) ? nomatch : wl[wordno - 2];
break;
case 'c':
case 'C':
pos = (wordno < 1) ? nomatch : wl[wordno - 1];
break;
case 'p':
break;
default:
stderror(ERR_COMPINV, CGETS(27, 1, "command"), cmd);
return TW_ZERO;
}
sep = ptr[1];
if (!Ispunct(sep)) {
/* Truncates data if WIDE_STRINGS */
stderror(ERR_COMPINV, CGETS(27, 2, "separator"), (int)sep);
return TW_ZERO;
}
ptr = tw_dollar(&ptr[2], wl, wordno, &ran, sep,
CGETS(27, 3, "pattern"));
cleanup_push(ran, xfree);
if (ran[0] == '\0') /* check for empty pattern (disallowed) */
{
stderror(ERR_COMPINC, cmd == 'p' ? CGETS(27, 4, "range") :
CGETS(27, 3, "pattern"), "");
return TW_ZERO;
}
ptr = tw_dollar(ptr, wl, wordno, &com, sep,
CGETS(27, 5, "completion"));
cleanup_push(com, xfree);
if (*ptr != '\0') {
if (*ptr == sep)
*suf = CHAR_ERR;
else
*suf = *ptr;
}
else
*suf = '\0';
#ifdef TDEBUG
xprintf("command: %c\nseparator: %c\n", cmd, (int)sep);
xprintf("pattern: %s\n", short2str(ran));
xprintf("completion: %s\n", short2str(com));
xprintf("suffix: ");
switch (*suf) {
case 0:
xprintf("*auto suffix*\n");
break;
case CHAR_ERR:
xprintf("*no suffix*\n");
break;
default:
xprintf("%c\n", (int)*suf);
break;
}
#endif /* TDEBUG */
switch (cmd) {
case 'p': /* positional completion */
#ifdef TDEBUG
xprintf("p: tw_pos(%s, %lu) = ", short2str(ran),
(unsigned long)wordno - 1);
xprintf("%d\n", tw_pos(ran, wordno - 1));
#endif /* TDEBUG */
if (!tw_pos(ran, wordno - 1)) {
cleanup_until(ran);
continue;
}
break;
case 'N': /* match with the next-next word */
case 'n': /* match with the next word */
case 'c': /* match with the current word */
case 'C':
#ifdef TDEBUG
xprintf("%c: ", cmd);
#endif /* TDEBUG */
if ((n = tw_match(pos, ran)) < 0) {
cleanup_until(ran);
continue;
}
if (cmd == 'c')
*word += n;
break;
default:
abort(); /* Cannot happen */
}
tsetenv(STRCOMMAND_LINE, line);
res = tw_result(com, pat);
Unsetenv(STRCOMMAND_LINE);
cleanup_until(buf);
return res;
}
cleanup_until(buf);
*suf = '\0';
return TW_ZERO;
} /* end tw_complete */