OpenBSD-4.6/usr.bin/vi/ex/ex_cscope.c
/* $OpenBSD: ex_cscope.c,v 1.15 2008/08/29 13:07:13 oga Exp $ */
/*-
* Copyright (c) 1994, 1996
* Rob Mayoff. All rights reserved.
* Copyright (c) 1996
* Keith Bostic. All rights reserved.
*
* See the LICENSE file for redistribution information.
*/
#include "config.h"
#ifndef lint
static const char sccsid[] = "@(#)ex_cscope.c 10.13 (Berkeley) 9/15/96";
#endif /* not lint */
#include <sys/param.h>
#include <sys/types.h> /* XXX: param.h may not have included types.h */
#include <sys/queue.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <bitstring.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include "../common/common.h"
#include "pathnames.h"
#include "tag.h"
#define CSCOPE_DBFILE "cscope.out"
#define CSCOPE_PATHS "cscope.tpath"
/*
* 0name find all uses of name
* 1name find definition of name
* 2name find all function calls made from name
* 3name find callers of name
* 4string find text string (cscope 12.9)
* 4name find assignments to name (cscope 13.3)
* 5pattern change pattern -- NOT USED
* 6pattern find pattern
* 7name find files with name as substring
* 8name find files #including name
*/
#define FINDHELP "\
find c|d|e|f|g|i|s|t buffer|pattern\n\
c: find callers of name\n\
d: find all function calls made from name\n\
e: find pattern\n\
f: find files with name as substring\n\
g: find definition of name\n\
i: find files #including name\n\
s: find all uses of name\n\
t: find assignments to name"
static int cscope_add(SCR *, EXCMD *, char *);
static int cscope_find(SCR *, EXCMD*, char *);
static int cscope_help(SCR *, EXCMD *, char *);
static int cscope_kill(SCR *, EXCMD *, char *);
static int cscope_reset(SCR *, EXCMD *, char *);
typedef struct _cc {
char *name;
int (*function)(SCR *, EXCMD *, char *);
char *help_msg;
char *usage_msg;
} CC;
static CC const cscope_cmds[] = {
{ "add", cscope_add,
"Add a new cscope database", "add file | directory" },
{ "find", cscope_find,
"Query the databases for a pattern", FINDHELP },
{ "help", cscope_help,
"Show help for cscope commands", "help [command]" },
{ "kill", cscope_kill,
"Kill a cscope connection", "kill number" },
{ "reset", cscope_reset,
"Discard all current cscope connections", "reset" },
{ NULL }
};
static TAGQ *create_cs_cmd(SCR *, char *, size_t *);
static int csc_help(SCR *, char *);
static void csc_file(SCR *, CSC *, char *, char **, size_t *, int *);
static int get_paths(SCR *, CSC *);
static CC const *lookup_ccmd(char *);
static int parse(SCR *, CSC *, TAGQ *, int *);
static int read_prompt(SCR *, CSC *);
static int run_cscope(SCR *, CSC *, char *);
static int start_cscopes(SCR *, EXCMD *);
static int terminate(SCR *, CSC *, int);
/*
* ex_cscope --
* Perform an ex cscope.
*
* PUBLIC: int ex_cscope(SCR *, EXCMD *);
*/
int
ex_cscope(sp, cmdp)
SCR *sp;
EXCMD *cmdp;
{
CC const *ccp;
EX_PRIVATE *exp;
int i;
char *cmd, *p;
/* Initialize the default cscope directories. */
exp = EXP(sp);
if (!F_ISSET(exp, EXP_CSCINIT) && start_cscopes(sp, cmdp))
return (1);
F_SET(exp, EXP_CSCINIT);
/* Skip leading whitespace. */
for (p = cmdp->argv[0]->bp, i = cmdp->argv[0]->len; i > 0; --i, ++p)
if (!isspace(*p))
break;
if (i == 0)
goto usage;
/* Skip the command to any arguments. */
for (cmd = p; i > 0; --i, ++p)
if (isspace(*p))
break;
if (*p != '\0') {
*p++ = '\0';
for (; isspace(*p); ++p);
}
if ((ccp = lookup_ccmd(cmd)) == NULL) {
usage: msgq(sp, M_ERR, "309|Use \"cscope help\" for help");
return (1);
}
/* Call the underlying function. */
return (ccp->function(sp, cmdp, p));
}
/*
* start_cscopes --
* Initialize the cscope package.
*/
static int
start_cscopes(sp, cmdp)
SCR *sp;
EXCMD *cmdp;
{
size_t blen, len;
char *bp, *cscopes, *p, *t;
/*
* EXTENSION #1:
*
* If the CSCOPE_DIRS environment variable is set, we treat it as a
* list of cscope directories that we're using, similar to the tags
* edit option.
*
* XXX
* This should probably be an edit option, although that implies that
* we start/stop cscope processes periodically, instead of once when
* the editor starts.
*/
if ((cscopes = getenv("CSCOPE_DIRS")) == NULL)
return (0);
len = strlen(cscopes);
GET_SPACE_RET(sp, bp, blen, len);
memcpy(bp, cscopes, len + 1);
for (cscopes = t = bp; (p = strsep(&t, "\t :")) != NULL;)
if (*p != '\0')
(void)cscope_add(sp, cmdp, p);
FREE_SPACE(sp, bp, blen);
return (0);
}
/*
* cscope_add --
* The cscope add command.
*/
static int
cscope_add(sp, cmdp, dname)
SCR *sp;
EXCMD *cmdp;
char *dname;
{
struct stat sb;
EX_PRIVATE *exp;
CSC *csc;
size_t len;
int cur_argc;
char *dbname, path[MAXPATHLEN];
exp = EXP(sp);
/*
* 0 additional args: usage.
* 1 additional args: matched a file.
* >1 additional args: object, too many args.
*/
cur_argc = cmdp->argc;
if (argv_exp2(sp, cmdp, dname, strlen(dname)))
return (1);
if (cmdp->argc == cur_argc) {
(void)csc_help(sp, "add");
return (1);
}
if (cmdp->argc == cur_argc + 1)
dname = cmdp->argv[cur_argc]->bp;
else {
ex_emsg(sp, dname, EXM_FILECOUNT);
return (1);
}
/*
* The user can specify a specific file (so they can have multiple
* Cscope databases in a single directory) or a directory. If the
* file doesn't exist, we're done. If it's a directory, append the
* standard database file name and try again. Store the directory
* name regardless so that we can use it as a base for searches.
*/
if (stat(dname, &sb)) {
msgq(sp, M_SYSERR, dname);
return (1);
}
if (S_ISDIR(sb.st_mode)) {
(void)snprintf(path, sizeof(path),
"%s/%s", dname, CSCOPE_DBFILE);
if (stat(path, &sb)) {
msgq(sp, M_SYSERR, path);
return (1);
}
dbname = CSCOPE_DBFILE;
} else if ((dbname = strrchr(dname, '/')) != NULL)
*dbname++ = '\0';
else {
dbname = dname;
dname = ".";
}
/* Allocate a cscope connection structure and initialize its fields. */
len = strlen(dname);
CALLOC_RET(sp, csc, CSC *, 1, sizeof(CSC) + len);
csc->dname = csc->buf;
csc->dlen = len;
memcpy(csc->dname, dname, len);
csc->mtime = sb.st_mtime;
/* Get the search paths for the cscope. */
if (get_paths(sp, csc))
goto err;
/* Start the cscope process. */
if (run_cscope(sp, csc, dbname))
goto err;
/*
* Add the cscope connection to the screen's list. From now on,
* on error, we have to call terminate, which expects the csc to
* be on the chain.
*/
LIST_INSERT_HEAD(&exp->cscq, csc, q);
/* Read the initial prompt from the cscope to make sure it's okay. */
if (read_prompt(sp, csc))
return (1);
return (0);
err: free(csc);
return (1);
}
/*
* get_paths --
* Get the directories to search for the files associated with this
* cscope database.
*/
static int
get_paths(sp, csc)
SCR *sp;
CSC *csc;
{
struct stat sb;
int fd, nentries;
size_t len;
char *p, **pathp, buf[MAXPATHLEN * 2];
/*
* EXTENSION #2:
*
* If there's a cscope directory with a file named CSCOPE_PATHS, it
* contains a colon-separated list of paths in which to search for
* files returned by cscope.
*
* XXX
* These paths are absolute paths, and not relative to the cscope
* directory. To fix this, rewrite the each path using the cscope
* directory as a prefix.
*/
(void)snprintf(buf, sizeof(buf), "%s/%s", csc->dname, CSCOPE_PATHS);
if (stat(buf, &sb) == 0) {
/* Read in the CSCOPE_PATHS file. */
len = sb.st_size;
MALLOC_RET(sp, csc->pbuf, char *, len + 1);
if ((fd = open(buf, O_RDONLY, 0)) < 0 ||
read(fd, csc->pbuf, len) != len) {
msgq_str(sp, M_SYSERR, buf, "%s");
if (fd >= 0)
(void)close(fd);
return (1);
}
(void)close(fd);
csc->pbuf[len] = '\0';
/* Count up the entries. */
for (nentries = 0, p = csc->pbuf; *p != '\0'; ++p)
if (p[0] == ':' && p[1] != '\0')
++nentries;
/* Build an array of pointers to the paths. */
CALLOC_GOTO(sp,
csc->paths, char **, nentries + 1, sizeof(char **));
for (pathp = csc->paths, p = strtok(csc->pbuf, ":");
p != NULL; p = strtok(NULL, ":"))
*pathp++ = p;
return (0);
}
/*
* If the CSCOPE_PATHS file doesn't exist, we look for files
* relative to the cscope directory.
*/
if ((csc->pbuf = strdup(csc->dname)) == NULL) {
msgq(sp, M_SYSERR, NULL);
return (1);
}
CALLOC_GOTO(sp, csc->paths, char **, 2, sizeof(char *));
csc->paths[0] = csc->pbuf;
return (0);
alloc_err:
if (csc->pbuf != NULL) {
free(csc->pbuf);
csc->pbuf = NULL;
}
return (1);
}
/*
* run_cscope --
* Fork off the cscope process.
*/
static int
run_cscope(sp, csc, dbname)
SCR *sp;
CSC *csc;
char *dbname;
{
int to_cs[2], from_cs[2];
char cmd[MAXPATHLEN * 2];
/*
* Cscope reads from to_cs[0] and writes to from_cs[1]; vi reads from
* from_cs[0] and writes to to_cs[1].
*/
to_cs[0] = to_cs[1] = from_cs[0] = from_cs[0] = -1;
if (pipe(to_cs) < 0 || pipe(from_cs) < 0) {
msgq(sp, M_SYSERR, "pipe");
goto err;
}
switch (csc->pid = vfork()) {
case -1:
msgq(sp, M_SYSERR, "vfork");
err: if (to_cs[0] != -1)
(void)close(to_cs[0]);
if (to_cs[1] != -1)
(void)close(to_cs[1]);
if (from_cs[0] != -1)
(void)close(from_cs[0]);
if (from_cs[1] != -1)
(void)close(from_cs[1]);
return (1);
case 0: /* child: run cscope. */
(void)dup2(to_cs[0], STDIN_FILENO);
(void)dup2(from_cs[1], STDOUT_FILENO);
(void)dup2(from_cs[1], STDERR_FILENO);
/* Close unused file descriptors. */
(void)close(to_cs[1]);
(void)close(from_cs[0]);
/* Run the cscope command. */
#define CSCOPE_CMD_FMT "cd '%s' && exec cscope -dl -f %s"
(void)snprintf(cmd, sizeof(cmd),
CSCOPE_CMD_FMT, csc->dname, dbname);
(void)execl(_PATH_BSHELL, "sh", "-c", cmd, (char *)NULL);
msgq_str(sp, M_SYSERR, cmd, "execl: %s");
_exit (127);
/* NOTREACHED */
default: /* parent. */
/* Close unused file descriptors. */
(void)close(to_cs[0]);
(void)close(from_cs[1]);
/*
* Save the file descriptors for later duplication, and
* reopen as streams.
*/
csc->to_fd = to_cs[1];
csc->to_fp = fdopen(to_cs[1], "w");
csc->from_fd = from_cs[0];
csc->from_fp = fdopen(from_cs[0], "r");
break;
}
return (0);
}
/*
* cscope_find --
* The cscope find command.
*/
static int
cscope_find(sp, cmdp, pattern)
SCR *sp;
EXCMD *cmdp;
char *pattern;
{
CSC *csc, *csc_next;
EX_PRIVATE *exp;
FREF *frp;
TAGQ *rtqp, *tqp;
TAG *rtp;
recno_t lno;
size_t cno, search;
int force, istmp, matches;
exp = EXP(sp);
/* Check for connections. */
if (LIST_FIRST(&exp->cscq) == NULL) {
msgq(sp, M_ERR, "310|No cscope connections running");
return (1);
}
/*
* Allocate all necessary memory before doing anything hard. If the
* tags stack is empty, we'll need the `local context' TAGQ structure
* later.
*/
rtp = NULL;
rtqp = NULL;
if (CIRCLEQ_FIRST(&exp->tq) == CIRCLEQ_END(&exp->tq)) {
/* Initialize the `local context' tag queue structure. */
CALLOC_GOTO(sp, rtqp, TAGQ *, 1, sizeof(TAGQ));
CIRCLEQ_INIT(&rtqp->tagq);
/* Initialize and link in its tag structure. */
CALLOC_GOTO(sp, rtp, TAG *, 1, sizeof(TAG));
CIRCLEQ_INSERT_HEAD(&rtqp->tagq, rtp, q);
rtqp->current = rtp;
}
/* Create the cscope command. */
if ((tqp = create_cs_cmd(sp, pattern, &search)) == NULL)
goto err;
/*
* Stick the current context in a convenient place, we'll lose it
* when we switch files.
*/
frp = sp->frp;
lno = sp->lno;
cno = sp->cno;
istmp = F_ISSET(sp->frp, FR_TMPFILE) && !F_ISSET(cmdp, E_NEWSCREEN);
/* Search all open connections for a match. */
matches = 0;
for (csc = LIST_FIRST(&exp->cscq); csc != NULL; csc = csc_next) {
/* Copy csc->q.lh_next here in case csc is killed. */
csc_next = LIST_NEXT(csc, q);
/*
* Send the command to the cscope program. (We skip the
* first two bytes of the command, because we stored the
* search cscope command character and a leading space
* there.)
*/
(void)fprintf(csc->to_fp, "%d%s\n", search, tqp->tag + 2);
(void)fflush(csc->to_fp);
/* Read the output. */
if (parse(sp, csc, tqp, &matches)) {
if (rtqp != NULL)
free(rtqp);
tagq_free(sp, tqp);
return (1);
}
}
if (matches == 0) {
msgq(sp, M_INFO, "278|No matches for query");
return (0);
}
tqp->current = CIRCLEQ_FIRST(&tqp->tagq);
/* Try to switch to the first tag. */
force = FL_ISSET(cmdp->iflags, E_C_FORCE);
if (F_ISSET(cmdp, E_NEWSCREEN)) {
if (ex_tag_Nswitch(sp, tqp->current, force))
goto err;
/* Everything else gets done in the new screen. */
sp = sp->nextdisp;
exp = EXP(sp);
} else
if (ex_tag_nswitch(sp, tqp->current, force))
goto err;
/*
* If this is the first tag, put a `current location' queue entry
* in place, so we can pop all the way back to the current mark.
* Note, it doesn't point to much of anything, it's a placeholder.
*/
if (CIRCLEQ_FIRST(&exp->tq) == CIRCLEQ_END(&exp->tq)) {
CIRCLEQ_INSERT_HEAD(&exp->tq, rtqp, q);
} else
rtqp = CIRCLEQ_FIRST(&exp->tq);
/* Link the current TAGQ structure into place. */
CIRCLEQ_INSERT_HEAD(&exp->tq, tqp, q);
(void)cscope_search(sp, tqp, tqp->current);
/*
* Move the current context from the temporary save area into the
* right structure.
*
* If we were in a temporary file, we don't have a context to which
* we can return, so just make it be the same as what we're moving
* to. It will be a little odd that ^T doesn't change anything, but
* I don't think it's a big deal.
*/
if (istmp) {
rtqp->current->frp = sp->frp;
rtqp->current->lno = sp->lno;
rtqp->current->cno = sp->cno;
} else {
rtqp->current->frp = frp;
rtqp->current->lno = lno;
rtqp->current->cno = cno;
}
return (0);
err:
alloc_err:
if (rtqp != NULL)
free(rtqp);
if (rtp != NULL)
free(rtp);
return (1);
}
/*
* create_cs_cmd --
* Build a cscope command, creating and initializing the base TAGQ.
*/
static TAGQ *
create_cs_cmd(sp, pattern, searchp)
SCR *sp;
char *pattern;
size_t *searchp;
{
CB *cbp;
TAGQ *tqp;
size_t tlen;
char *p;
/*
* Cscope supports a "change pattern" command which we never use,
* cscope command 5. Set CSCOPE_QUERIES[5] to " " since the user
* can't pass " " as the first character of pattern. That way the
* user can't ask for pattern 5 so we don't need any special-case
* code.
*/
#define CSCOPE_QUERIES "sgdct efi"
if (pattern == NULL)
goto usage;
/* Skip leading blanks, check for command character. */
for (; isblank(pattern[0]); ++pattern);
if (pattern[0] == '\0' || !isblank(pattern[1]))
goto usage;
for (*searchp = 0, p = CSCOPE_QUERIES;
*p != '\0' && *p != pattern[0]; ++*searchp, ++p);
if (*p == '\0') {
msgq(sp, M_ERR,
"311|%s: unknown search type: use one of %s",
KEY_NAME(sp, pattern[0]), CSCOPE_QUERIES);
return (NULL);
}
/* Skip <blank> characters to the pattern. */
for (p = pattern + 1; isblank(*p); ++p);
if (*p == '\0') {
usage: (void)csc_help(sp, "find");
return (NULL);
}
/* The user can specify the contents of a buffer as the pattern. */
cbp = NULL;
if (p[0] == '"' && p[1] != '\0' && p[2] == '\0')
CBNAME(sp, cbp, p[1]);
if (cbp != NULL) {
p = CIRCLEQ_FIRST(&cbp->textq)->lb;
tlen = CIRCLEQ_FIRST(&cbp->textq)->len;
} else
tlen = strlen(p);
/* Allocate and initialize the TAGQ structure. */
CALLOC(sp, tqp, TAGQ *, 1, sizeof(TAGQ) + tlen + 3);
if (tqp == NULL)
return (NULL);
CIRCLEQ_INIT(&tqp->tagq);
tqp->tag = tqp->buf;
tqp->tag[0] = pattern[0];
tqp->tag[1] = ' ';
tqp->tlen = tlen + 2;
memcpy(tqp->tag + 2, p, tlen);
tqp->tag[tlen + 2] = '\0';
F_SET(tqp, TAG_CSCOPE);
return (tqp);
}
/*
* parse --
* Parse the cscope output.
*/
static int
parse(sp, csc, tqp, matchesp)
SCR *sp;
CSC *csc;
TAGQ *tqp;
int *matchesp;
{
TAG *tp;
recno_t slno;
size_t dlen, nlen, slen;
int ch, i, isolder, nlines;
char *dname, *name, *search, *p, *t, dummy[2], buf[2048];
for (;;) {
if (!fgets(buf, sizeof(buf), csc->from_fp))
goto io_err;
/*
* If the database is out of date, or there's some other
* problem, cscope will output error messages before the
* number-of-lines output. Display/discard any output
* that doesn't match what we want.
*/
#define CSCOPE_NLINES_FMT "cscope: %d lines%1[\n]"
if (sscanf(buf, CSCOPE_NLINES_FMT, &nlines, dummy) == 2)
break;
buf[strcspn(buf, "\n")] = '\0';
msgq(sp, M_ERR, "%s: \"%s\"", csc->dname, buf);
}
while (nlines--) {
if (fgets(buf, sizeof(buf), csc->from_fp) == NULL)
goto io_err;
/* If the line's too long for the buffer, discard it. */
if ((p = strchr(buf, '\n')) == NULL) {
while ((ch = getc(csc->from_fp)) != EOF && ch != '\n');
continue;
}
*p = '\0';
/*
* The cscope output is in the following format:
*
* <filename> <context> <line number> <pattern>
*
* Figure out how long everything is so we can allocate in one
* swell foop, but discard anything that looks wrong.
*/
for (p = buf, i = 0;
i < 3 && (t = strsep(&p, "\t ")) != NULL; ++i)
switch (i) {
case 0: /* Filename. */
name = t;
nlen = strlen(name);
break;
case 1: /* Context. */
break;
case 2: /* Line number. */
slno = (recno_t)atol(t);
break;
}
if (i != 3 || p == NULL || t == NULL)
continue;
/* The rest of the string is the search pattern. */
search = p;
slen = strlen(p);
/* Resolve the file name. */
csc_file(sp, csc, name, &dname, &dlen, &isolder);
/*
* If the file is older than the cscope database, that is,
* the database was built since the file was last modified,
* or there wasn't a search string, use the line number.
*/
if (isolder || strcmp(search, "<unknown>") == 0) {
search = NULL;
slen = 0;
}
/*
* Allocate and initialize a tag structure plus the variable
* length cscope information that follows it.
*/
CALLOC_RET(sp, tp,
TAG *, 1, sizeof(TAG) + dlen + 2 + nlen + 1 + slen + 1);
tp->fname = tp->buf;
if (dlen != 0) {
memcpy(tp->fname, dname, dlen);
tp->fname[dlen] = '/';
++dlen;
}
memcpy(tp->fname + dlen, name, nlen + 1);
tp->fnlen = dlen + nlen;
tp->slno = slno;
if (slen != 0) {
tp->search = tp->fname + tp->fnlen + 1;
memcpy(tp->search, search, (tp->slen = slen) + 1);
}
CIRCLEQ_INSERT_TAIL(&tqp->tagq, tp, q);
++*matchesp;
}
(void)read_prompt(sp, csc);
return (0);
io_err: if (feof(csc->from_fp))
errno = EIO;
msgq_str(sp, M_SYSERR, "%s", csc->dname);
terminate(sp, csc, 0);
return (1);
}
/*
* csc_file --
* Search for the right path to this file.
*/
static void
csc_file(sp, csc, name, dirp, dlenp, isolderp)
SCR *sp;
CSC *csc;
char *name, **dirp;
size_t *dlenp;
int *isolderp;
{
struct stat sb;
char **pp, buf[MAXPATHLEN];
/*
* Check for the file in all of the listed paths. If we don't
* find it, we simply return it unchanged. We have to do this
* now, even though it's expensive, because if the user changes
* directories, we can't change our minds as to where the file
* lives.
*/
for (pp = csc->paths; *pp != NULL; ++pp) {
(void)snprintf(buf, sizeof(buf), "%s/%s", *pp, name);
if (stat(buf, &sb) == 0) {
*dirp = *pp;
*dlenp = strlen(*pp);
*isolderp = sb.st_mtime < csc->mtime;
return;
}
}
*dlenp = 0;
}
/*
* cscope_help --
* The cscope help command.
*/
static int
cscope_help(sp, cmdp, subcmd)
SCR *sp;
EXCMD *cmdp;
char *subcmd;
{
return (csc_help(sp, subcmd));
}
/*
* csc_help --
* Display help/usage messages.
*/
static int
csc_help(sp, cmd)
SCR *sp;
char *cmd;
{
CC const *ccp;
if (cmd != NULL && *cmd != '\0') {
if ((ccp = lookup_ccmd(cmd)) == NULL) {
ex_printf(sp,
"%s doesn't match any cscope command\n", cmd);
return (1);
} else {
ex_printf(sp,
"Command: %s (%s)\n", ccp->name, ccp->help_msg);
ex_printf(sp, " Usage: %s\n", ccp->usage_msg);
return (0);
}
}
ex_printf(sp, "cscope commands:\n");
for (ccp = cscope_cmds; ccp->name != NULL; ++ccp)
ex_printf(sp, " %*s: %s\n", 5, ccp->name, ccp->help_msg);
return (0);
}
/*
* cscope_kill --
* The cscope kill command.
*/
static int
cscope_kill(sp, cmdp, cn)
SCR *sp;
EXCMD *cmdp;
char *cn;
{
return (terminate(sp, NULL, atoi(cn)));
}
/*
* terminate --
* Detach from a cscope process.
*/
static int
terminate(sp, csc, n)
SCR *sp;
CSC *csc;
int n;
{
EX_PRIVATE *exp;
int i, pstat;
exp = EXP(sp);
/*
* We either get a csc structure or a number. If not provided a
* csc structure, find the right one.
*/
if (csc == NULL) {
if (n < 1)
goto badno;
for (i = 1, csc = LIST_FIRST(&exp->cscq);
csc != NULL; csc = LIST_NEXT(csc, q), i++)
if (i == n)
break;
if (csc == NULL) {
badno: msgq(sp, M_ERR, "312|%d: no such cscope session", n);
return (1);
}
}
/*
* XXX
* Theoretically, we have the only file descriptors to the process,
* so closing them should let it exit gracefully, deleting temporary
* files, etc. The original vi cscope integration sent the cscope
* connection a SIGTERM signal, so I'm not sure if closing the file
* descriptors is sufficient.
*/
if (csc->from_fp != NULL)
(void)fclose(csc->from_fp);
if (csc->to_fp != NULL)
(void)fclose(csc->to_fp);
(void)waitpid(csc->pid, &pstat, 0);
/* Discard cscope connection information. */
LIST_REMOVE(csc, q);
if (csc->pbuf != NULL)
free(csc->pbuf);
if (csc->paths != NULL)
free(csc->paths);
free(csc);
return (0);
}
/*
* cscope_reset --
* The cscope reset command.
*/
static int
cscope_reset(sp, cmdp, notusedp)
SCR *sp;
EXCMD *cmdp;
char *notusedp;
{
EX_PRIVATE *exp;
for (exp = EXP(sp); LIST_FIRST(&exp->cscq) != NULL;)
if (cscope_kill(sp, cmdp, "1"))
return (1);
return (0);
}
/*
* cscope_display --
* Display current connections.
*
* PUBLIC: int cscope_display(SCR *);
*/
int
cscope_display(sp)
SCR *sp;
{
EX_PRIVATE *exp;
CSC *csc;
int i;
exp = EXP(sp);
if (LIST_FIRST(&exp->cscq) == NULL) {
ex_printf(sp, "No cscope connections.\n");
return (0);
}
for (i = 1,
csc = LIST_FIRST(&exp->cscq); csc != NULL; ++i, csc = LIST_NEXT(csc, q))
ex_printf(sp,
"%2d %s (process %ld)\n", i, csc->dname, (long)csc->pid);
return (0);
}
/*
* cscope_search --
* Search a file for a cscope entry.
*
* PUBLIC: int cscope_search(SCR *, TAGQ *, TAG *);
*/
int
cscope_search(sp, tqp, tp)
SCR *sp;
TAGQ *tqp;
TAG *tp;
{
MARK m;
/* If we don't have a search pattern, use the line number. */
if (tp->search == NULL) {
if (!db_exist(sp, tp->slno)) {
tag_msg(sp, TAG_BADLNO, tqp->tag);
return (1);
}
m.lno = tp->slno;
} else {
/*
* Search for the tag; cheap fallback for C functions
* if the name is the same but the arguments have changed.
*/
m.lno = 1;
m.cno = 0;
if (f_search(sp, &m, &m,
tp->search, tp->slen, NULL, SEARCH_CSCOPE | SEARCH_FILE)) {
tag_msg(sp, TAG_SEARCH, tqp->tag);
return (1);
}
/*
* !!!
* Historically, tags set the search direction if it wasn't
* already set.
*/
if (sp->searchdir == NOTSET)
sp->searchdir = FORWARD;
}
/*
* !!!
* Tags move to the first non-blank, NOT the search pattern start.
*/
sp->lno = m.lno;
sp->cno = 0;
(void)nonblank(sp, sp->lno, &sp->cno);
return (0);
}
/*
* lookup_ccmd --
* Return a pointer to the command structure.
*/
static CC const *
lookup_ccmd(name)
char *name;
{
CC const *ccp;
size_t len;
len = strlen(name);
for (ccp = cscope_cmds; ccp->name != NULL; ++ccp)
if (strncmp(name, ccp->name, len) == 0)
return (ccp);
return (NULL);
}
/*
* read_prompt --
* Read a prompt from cscope.
*/
static int
read_prompt(sp, csc)
SCR *sp;
CSC *csc;
{
int ch;
#define CSCOPE_PROMPT ">> "
for (;;) {
while ((ch =
getc(csc->from_fp)) != EOF && ch != CSCOPE_PROMPT[0]);
if (ch == EOF) {
terminate(sp, csc, 0);
return (1);
}
if (getc(csc->from_fp) != CSCOPE_PROMPT[1])
continue;
if (getc(csc->from_fp) != CSCOPE_PROMPT[2])
continue;
break;
}
return (0);
}