2 * Copyright (c) 1994, 1996
3 * Rob Mayoff. All rights reserved.
5 * Keith Bostic. All rights reserved.
7 * See the LICENSE file for redistribution information.
12 #include <sys/types.h>
13 #include <sys/queue.h>
17 #include <bitstring.h>
30 #include "../common/common.h"
31 #include "pathnames.h"
34 #define CSCOPE_DBFILE "cscope.out"
35 #define CSCOPE_PATHS "cscope.tpath"
38 * 0name find all uses of name
39 * 1name find definition of name
40 * 2name find all function calls made from name
41 * 3name find callers of name
42 * 4string find text string (cscope 12.9)
43 * 4name find assignments to name (cscope 13.3)
44 * 5pattern change pattern -- NOT USED
45 * 6pattern find pattern
46 * 7name find files with name as substring
47 * 8name find files #including name
50 find c|d|e|f|g|i|s|t buffer|pattern\n\
51 c: find callers of name\n\
52 d: find all function calls made from name\n\
54 f: find files with name as substring\n\
55 g: find definition of name\n\
56 i: find files #including name\n\
57 s: find all uses of name\n\
58 t: find assignments to name"
60 static int cscope_add(SCR *, EXCMD *, CHAR_T *);
61 static int cscope_find(SCR *, EXCMD*, CHAR_T *);
62 static int cscope_help(SCR *, EXCMD *, CHAR_T *);
63 static int cscope_kill(SCR *, EXCMD *, CHAR_T *);
64 static int cscope_reset(SCR *, EXCMD *, CHAR_T *);
68 int (*function)(SCR *, EXCMD *, CHAR_T *);
73 static CC const cscope_cmds[] = {
75 "Add a new cscope database", "add file | directory" },
76 { "find", cscope_find,
77 "Query the databases for a pattern", FINDHELP },
78 { "help", cscope_help,
79 "Show help for cscope commands", "help [command]" },
80 { "kill", cscope_kill,
81 "Kill a cscope connection", "kill number" },
82 { "reset", cscope_reset,
83 "Discard all current cscope connections", "reset" },
87 static TAGQ *create_cs_cmd(SCR *, char *, size_t *);
88 static int csc_help(SCR *, char *);
89 static void csc_file(SCR *,
90 CSC *, char *, char **, size_t *, int *);
91 static int get_paths(SCR *, CSC *);
92 static CC const *lookup_ccmd(char *);
93 static int parse(SCR *, CSC *, TAGQ *, int *);
94 static int read_prompt(SCR *, CSC *);
95 static int run_cscope(SCR *, CSC *, char *);
96 static int start_cscopes(SCR *, EXCMD *);
97 static int terminate(SCR *, CSC *, int);
101 * Perform an ex cscope.
103 * PUBLIC: int ex_cscope(SCR *, EXCMD *);
106 ex_cscope(SCR *sp, EXCMD *cmdp)
116 /* Initialize the default cscope directories. */
118 if (!F_ISSET(exp, EXP_CSCINIT) && start_cscopes(sp, cmdp))
120 F_SET(exp, EXP_CSCINIT);
122 /* Skip leading whitespace. */
123 for (p = cmdp->argv[0]->bp, i = cmdp->argv[0]->len; i > 0; --i, ++p)
129 /* Skip the command to any arguments. */
130 for (cmd = p; i > 0; --i, ++p)
135 for (; *p && isspace(*p); ++p);
138 INT2CHAR(sp, cmd, STRLEN(cmd) + 1, np, nlen);
139 if ((ccp = lookup_ccmd(np)) == NULL) {
140 usage: msgq(sp, M_ERR, "309|Use \"cscope help\" for help");
144 /* Call the underlying function. */
145 return (ccp->function(sp, cmdp, p));
150 * Initialize the cscope package.
153 start_cscopes(SCR *sp, EXCMD *cmdp)
156 char *bp, *cscopes, *p, *t;
163 * If the CSCOPE_DIRS environment variable is set, we treat it as a
164 * list of cscope directories that we're using, similar to the tags
168 * This should probably be an edit option, although that implies that
169 * we start/stop cscope processes periodically, instead of once when
172 if ((cscopes = getenv("CSCOPE_DIRS")) == NULL)
174 len = strlen(cscopes);
175 GET_SPACE_RETC(sp, bp, blen, len);
176 memcpy(bp, cscopes, len + 1);
178 for (cscopes = t = bp; (p = strsep(&t, "\t :")) != NULL;)
180 CHAR2INT(sp, p, strlen(p) + 1, wp, wlen);
181 (void)cscope_add(sp, cmdp, wp);
184 FREE_SPACE(sp, bp, blen);
190 * The cscope add command.
193 cscope_add(SCR *sp, EXCMD *cmdp, CHAR_T *dname)
207 * 0 additional args: usage.
208 * 1 additional args: matched a file.
209 * >1 additional args: object, too many args.
211 cur_argc = cmdp->argc;
212 if (argv_exp2(sp, cmdp, dname, STRLEN(dname))) {
215 if (cmdp->argc == cur_argc) {
216 (void)csc_help(sp, "add");
219 if (cmdp->argc == cur_argc + 1)
220 dname = cmdp->argv[cur_argc]->bp;
222 ex_emsg(sp, np, EXM_FILECOUNT);
226 INT2CHAR(sp, dname, STRLEN(dname)+1, np, nlen);
229 * The user can specify a specific file (so they can have multiple
230 * Cscope databases in a single directory) or a directory. If the
231 * file doesn't exist, we're done. If it's a directory, append the
232 * standard database file name and try again. Store the directory
233 * name regardless so that we can use it as a base for searches.
236 msgq(sp, M_SYSERR, "%s", np);
239 if (S_ISDIR(sb.st_mode)) {
240 if ((path = join(np, CSCOPE_DBFILE)) == NULL) {
241 msgq(sp, M_SYSERR, NULL);
244 if (stat(path, &sb)) {
245 msgq(sp, M_SYSERR, "%s", path);
250 dbname = CSCOPE_DBFILE;
251 } else if ((dbname = strrchr(np, '/')) != NULL)
258 /* Allocate a cscope connection structure and initialize its fields. */
260 CALLOC_RET(sp, csc, 1, sizeof(CSC) + len);
261 csc->dname = csc->buf;
263 memcpy(csc->dname, np, len);
264 csc->mtim = sb.st_mtim;
266 /* Get the search paths for the cscope. */
267 if (get_paths(sp, csc))
270 /* Start the cscope process. */
271 if (run_cscope(sp, csc, dbname))
275 * Add the cscope connection to the screen's list. From now on,
276 * on error, we have to call terminate, which expects the csc to
279 SLIST_INSERT_HEAD(exp->cscq, csc, q);
281 /* Read the initial prompt from the cscope to make sure it's okay. */
282 return read_prompt(sp, csc);
290 * Get the directories to search for the files associated with this
294 get_paths(SCR *sp, CSC *csc)
299 char *p, **pathp, *buf;
304 * If there's a cscope directory with a file named CSCOPE_PATHS, it
305 * contains a colon-separated list of paths in which to search for
306 * files returned by cscope.
309 * These paths are absolute paths, and not relative to the cscope
310 * directory. To fix this, rewrite the each path using the cscope
311 * directory as a prefix.
313 if ((buf = join(csc->dname, CSCOPE_PATHS)) == NULL) {
314 msgq(sp, M_SYSERR, NULL);
317 if (stat(buf, &sb) == 0) {
318 /* Read in the CSCOPE_PATHS file. */
320 MALLOC_RET(sp, csc->pbuf, len + 1);
321 if ((fd = open(buf, O_RDONLY, 0)) < 0 ||
322 read(fd, csc->pbuf, len) != len) {
323 msgq_str(sp, M_SYSERR, buf, "%s");
331 csc->pbuf[len] = '\0';
333 /* Count up the entries. */
334 for (nentries = 0, p = csc->pbuf; *p != '\0'; ++p)
335 if (p[0] == ':' && p[1] != '\0')
338 /* Build an array of pointers to the paths. */
339 CALLOC_GOTO(sp, csc->paths, nentries + 1, sizeof(char **));
340 for (pathp = csc->paths, p = strtok(csc->pbuf, ":");
341 p != NULL; p = strtok(NULL, ":"))
348 * If the CSCOPE_PATHS file doesn't exist, we look for files
349 * relative to the cscope directory.
351 if ((csc->pbuf = strdup(csc->dname)) == NULL) {
352 msgq(sp, M_SYSERR, NULL);
355 CALLOC_GOTO(sp, csc->paths, 2, sizeof(char *));
356 csc->paths[0] = csc->pbuf;
367 * Fork off the cscope process.
370 run_cscope(SCR *sp, CSC *csc, char *dbname)
372 int to_cs[2], from_cs[2];
376 * Cscope reads from to_cs[0] and writes to from_cs[1]; vi reads from
377 * from_cs[0] and writes to to_cs[1].
379 to_cs[0] = to_cs[1] = from_cs[0] = from_cs[1] = -1;
380 if (pipe(to_cs) < 0 || pipe(from_cs) < 0) {
381 msgq(sp, M_SYSERR, "pipe");
384 switch (csc->pid = vfork()) {
387 msgq(sp, M_SYSERR, "vfork");
388 err: if (to_cs[0] != -1)
389 (void)close(to_cs[0]);
391 (void)close(to_cs[1]);
392 if (from_cs[0] != -1)
393 (void)close(from_cs[0]);
394 if (from_cs[1] != -1)
395 (void)close(from_cs[1]);
397 case 0: /* child: run cscope. */
398 (void)dup2(to_cs[0], STDIN_FILENO);
399 (void)dup2(from_cs[1], STDOUT_FILENO);
400 (void)dup2(from_cs[1], STDERR_FILENO);
402 /* Close unused file descriptors. */
403 (void)close(to_cs[1]);
404 (void)close(from_cs[0]);
406 /* Run the cscope command. */
407 #define CSCOPE_CMD_FMT "cd %s && exec cscope -dl -f %s"
408 if ((dn = quote(csc->dname)) == NULL)
410 if ((dbn = quote(dbname)) == NULL) {
414 if (asprintf(&cmd, CSCOPE_CMD_FMT, dn, dbn) == -1)
419 nomem: msgq(sp, M_SYSERR, NULL);
422 (void)execl(_PATH_BSHELL, "sh", "-c", cmd, (char *)NULL);
423 msgq_str(sp, M_SYSERR, cmd, "execl: %s");
427 default: /* parent. */
428 /* Close unused file descriptors. */
429 (void)close(to_cs[0]);
430 (void)close(from_cs[1]);
433 * Save the file descriptors for later duplication, and
436 csc->to_fd = to_cs[1];
437 csc->to_fp = fdopen(to_cs[1], "w");
438 csc->from_fd = from_cs[0];
439 csc->from_fp = fdopen(from_cs[0], "r");
447 * The cscope find command.
450 cscope_find(SCR *sp, EXCMD *cmdp, CHAR_T *pattern)
459 int force, istmp, matches;
465 /* Check for connections. */
466 if (SLIST_EMPTY(exp->cscq)) {
467 msgq(sp, M_ERR, "310|No cscope connections running");
472 * Allocate all necessary memory before doing anything hard. If the
473 * tags stack is empty, we'll need the `local context' TAGQ structure
478 if (TAILQ_EMPTY(exp->tq)) {
479 /* Initialize the `local context' tag queue structure. */
480 CALLOC_GOTO(sp, rtqp, 1, sizeof(TAGQ));
481 TAILQ_INIT(rtqp->tagq);
483 /* Initialize and link in its tag structure. */
484 CALLOC_GOTO(sp, rtp, 1, sizeof(TAG));
485 TAILQ_INSERT_HEAD(rtqp->tagq, rtp, q);
489 /* Create the cscope command. */
490 INT2CHAR(sp, pattern, STRLEN(pattern) + 1, np, nlen);
492 if ((tqp = create_cs_cmd(sp, np, &search)) == NULL)
498 * Stick the current context in a convenient place, we'll lose it
499 * when we switch files.
504 istmp = F_ISSET(sp->frp, FR_TMPFILE) && !F_ISSET(cmdp, E_NEWSCREEN);
506 /* Search all open connections for a match. */
508 /* Copy next connect here in case csc is killed. */
509 SLIST_FOREACH_SAFE(csc, exp->cscq, q, csc_next) {
511 * Send the command to the cscope program. (We skip the
512 * first two bytes of the command, because we stored the
513 * search cscope command character and a leading space
516 (void)fprintf(csc->to_fp, "%lu%s\n", search, tqp->tag + 2);
517 (void)fflush(csc->to_fp);
519 /* Read the output. */
520 if (parse(sp, csc, tqp, &matches))
525 msgq(sp, M_INFO, "278|No matches for query");
532 /* Try to switch to the first tag. */
533 force = FL_ISSET(cmdp->iflags, E_C_FORCE);
534 if (F_ISSET(cmdp, E_NEWSCREEN)) {
535 if (ex_tag_Nswitch(sp, tqp->current, force))
538 /* Everything else gets done in the new screen. */
542 if (ex_tag_nswitch(sp, tqp->current, force))
546 * If this is the first tag, put a `current location' queue entry
547 * in place, so we can pop all the way back to the current mark.
548 * Note, it doesn't point to much of anything, it's a placeholder.
550 if (TAILQ_EMPTY(exp->tq)) {
551 TAILQ_INSERT_HEAD(exp->tq, rtqp, q);
553 rtqp = TAILQ_FIRST(exp->tq);
555 /* Link the current TAGQ structure into place. */
556 TAILQ_INSERT_HEAD(exp->tq, tqp, q);
558 (void)cscope_search(sp, tqp, tqp->current);
561 * Move the current context from the temporary save area into the
564 * If we were in a temporary file, we don't have a context to which
565 * we can return, so just make it be the same as what we're moving
566 * to. It will be a little odd that ^T doesn't change anything, but
567 * I don't think it's a big deal.
570 rtqp->current->frp = sp->frp;
571 rtqp->current->lno = sp->lno;
572 rtqp->current->cno = sp->cno;
574 rtqp->current->frp = frp;
575 rtqp->current->lno = lno;
576 rtqp->current->cno = cno;
591 * Build a cscope command, creating and initializing the base TAGQ.
594 create_cs_cmd(SCR *sp, char *pattern, size_t *searchp)
602 * Cscope supports a "change pattern" command which we never use,
603 * cscope command 5. Set CSCOPE_QUERIES[5] to " " since the user
604 * can't pass " " as the first character of pattern. That way the
605 * user can't ask for pattern 5 so we don't need any special-case
608 #define CSCOPE_QUERIES "sgdct efi"
613 /* Skip leading blanks, check for command character. */
614 for (; cmdskip(pattern[0]); ++pattern);
615 if (pattern[0] == '\0' || !cmdskip(pattern[1]))
617 for (*searchp = 0, p = CSCOPE_QUERIES;
618 *p != '\0' && *p != pattern[0]; ++*searchp, ++p);
621 "311|%s: unknown search type: use one of %s",
622 KEY_NAME(sp, pattern[0]), CSCOPE_QUERIES);
626 /* Skip <blank> characters to the pattern. */
627 for (p = pattern + 1; *p != '\0' && cmdskip(*p); ++p);
629 usage: (void)csc_help(sp, "find");
633 /* The user can specify the contents of a buffer as the pattern. */
635 if (p[0] == '"' && p[1] != '\0' && p[2] == '\0')
636 CBNAME(sp, cbp, p[1]);
638 INT2CHAR(sp, TAILQ_FIRST(cbp->textq)->lb,
639 TAILQ_FIRST(cbp->textq)->len, p, tlen);
643 /* Allocate and initialize the TAGQ structure. */
644 CALLOC(sp, tqp, 1, sizeof(TAGQ) + tlen + 3);
647 TAILQ_INIT(tqp->tagq);
649 tqp->tag[0] = pattern[0];
651 tqp->tlen = tlen + 2;
652 memcpy(tqp->tag + 2, p, tlen);
653 tqp->tag[tlen + 2] = '\0';
654 F_SET(tqp, TAG_CSCOPE);
661 * Parse the cscope output.
664 parse(SCR *sp, CSC *csc, TAGQ *tqp, int *matchesp)
668 size_t dlen, nlen = 0, slen = 0;
669 int ch, i, isolder = 0, nlines;
670 char *dname = NULL, *name = NULL, *search, *p, *t, dummy[2], buf[2048];
675 if (!fgets(buf, sizeof(buf), csc->from_fp))
679 * If the database is out of date, or there's some other
680 * problem, cscope will output error messages before the
681 * number-of-lines output. Display/discard any output
682 * that doesn't match what we want.
684 #define CSCOPE_NLINES_FMT "cscope: %d lines%1[\n]"
685 if (sscanf(buf, CSCOPE_NLINES_FMT, &nlines, dummy) == 2)
687 if ((p = strchr(buf, '\n')) != NULL)
689 msgq(sp, M_ERR, "%s: \"%s\"", csc->dname, buf);
693 if (fgets(buf, sizeof(buf), csc->from_fp) == NULL)
696 /* If the line's too long for the buffer, discard it. */
697 if ((p = strchr(buf, '\n')) == NULL) {
698 while ((ch = getc(csc->from_fp)) != EOF && ch != '\n');
704 * The cscope output is in the following format:
706 * <filename> <context> <line number> <pattern>
708 * Figure out how long everything is so we can allocate in one
709 * swell foop, but discard anything that looks wrong.
712 i < 3 && (t = strsep(&p, "\t ")) != NULL; ++i)
714 case 0: /* Filename. */
718 case 1: /* Context. */
720 case 2: /* Line number. */
721 slno = (recno_t)atol(t);
724 if (i != 3 || p == NULL || t == NULL)
727 /* The rest of the string is the search pattern. */
731 /* Resolve the file name. */
732 csc_file(sp, csc, name, &dname, &dlen, &isolder);
735 * If the file is older than the cscope database, that is,
736 * the database was built since the file was last modified,
737 * or there wasn't a search string, use the line number.
739 if (isolder || strcmp(search, "<unknown>") == 0) {
745 * Allocate and initialize a tag structure plus the variable
746 * length cscope information that follows it.
748 CALLOC_RET(sp, tp, 1,
749 sizeof(TAG) + dlen + 2 + nlen + 1 + (slen + 1) * sizeof(CHAR_T));
750 tp->fname = (char *)tp->buf;
751 if (dlen == 1 && *dname == '.')
753 else if (dlen != 0) {
754 memcpy(tp->fname, dname, dlen);
755 tp->fname[dlen] = '/';
758 memcpy(tp->fname + dlen, name, nlen + 1);
759 tp->fnlen = dlen + nlen;
762 tp->search = (CHAR_T*)(tp->fname + tp->fnlen + 1);
763 CHAR2INT(sp, search, slen + 1, wp, wlen);
764 MEMCPY(tp->search, wp, (tp->slen = slen) + 1);
766 TAILQ_INSERT_TAIL(tqp->tagq, tp, q);
768 /* Try to preset the tag within the current file. */
769 if (sp->frp != NULL && sp->frp->name != NULL &&
770 tqp->current == NULL && !strcmp(tp->fname, sp->frp->name))
776 if (tqp->current == NULL)
777 tqp->current = TAILQ_FIRST(tqp->tagq);
779 return read_prompt(sp, csc);
781 io_err: if (feof(csc->from_fp))
783 msgq_str(sp, M_SYSERR, "%s", csc->dname);
784 terminate(sp, csc, 0);
790 * Search for the right path to this file.
793 csc_file(SCR *sp, CSC *csc, char *name, char **dirp, size_t *dlenp, int *isolderp)
799 * Check for the file in all of the listed paths. If we don't
800 * find it, we simply return it unchanged. We have to do this
801 * now, even though it's expensive, because if the user changes
802 * directories, we can't change our minds as to where the file
805 for (pp = csc->paths; *pp != NULL; ++pp) {
806 if ((buf = join(*pp, name)) == NULL) {
807 msgq(sp, M_SYSERR, NULL);
811 if (stat(buf, &sb) == 0) {
814 *dlenp = strlen(*pp);
815 *isolderp = timespeccmp(
816 &sb.st_mtim, &csc->mtim, <);
826 * The cscope help command.
829 cscope_help(SCR *sp, EXCMD *cmdp, CHAR_T *subcmd)
834 INT2CHAR(sp, subcmd, STRLEN(subcmd) + 1, np, nlen);
835 return (csc_help(sp, np));
840 * Display help/usage messages.
843 csc_help(SCR *sp, char *cmd)
847 if (cmd != NULL && *cmd != '\0') {
848 if ((ccp = lookup_ccmd(cmd)) == NULL) {
850 "%s doesn't match any cscope command\n", cmd);
854 "Command: %s (%s)\n", ccp->name, ccp->help_msg);
855 ex_printf(sp, " Usage: %s\n", ccp->usage_msg);
860 ex_printf(sp, "cscope commands:\n");
861 for (ccp = cscope_cmds; ccp->name != NULL; ++ccp)
862 ex_printf(sp, " %*s: %s\n", 5, ccp->name, ccp->help_msg);
868 * The cscope kill command.
871 cscope_kill(SCR *sp, EXCMD *cmdp, CHAR_T *cn)
878 INT2CHAR(sp, cn, STRLEN(cn) + 1, np, nlen);
881 return (terminate(sp, NULL, n));
886 * Detach from a cscope process.
889 terminate(SCR *sp, CSC *csc, int n)
893 CSC *cp, *pre_cp = NULL;
898 * We either get a csc structure or a number. Locate and remove
899 * the candidate which matches the structure or the number.
901 if (csc == NULL && n < 1)
903 SLIST_FOREACH(cp, exp->cscq, q) {
905 if (csc == NULL ? i != n : cp != csc) {
909 if (cp == SLIST_FIRST(exp->cscq))
910 SLIST_REMOVE_HEAD(exp->cscq, q);
912 SLIST_REMOVE_AFTER(pre_cp, q);
917 badno: msgq(sp, M_ERR, "312|%d: no such cscope session", n);
923 * Theoretically, we have the only file descriptors to the process,
924 * so closing them should let it exit gracefully, deleting temporary
925 * files, etc. However, the earlier created cscope processes seems
926 * to refuse to quit unless we send a SIGTERM signal.
928 if (csc->from_fp != NULL)
929 (void)fclose(csc->from_fp);
930 if (csc->to_fp != NULL)
931 (void)fclose(csc->to_fp);
933 (void)kill(csc->pid, SIGTERM);
934 (void)waitpid(csc->pid, &pstat, 0);
936 /* Discard cscope connection information. */
945 * The cscope reset command.
948 cscope_reset(SCR *sp, EXCMD *cmdp, CHAR_T *notusedp)
950 return cscope_end(sp);
955 * End all cscope connections.
957 * PUBLIC: int cscope_end(SCR *);
964 for (exp = EXP(sp); !SLIST_EMPTY(exp->cscq);)
965 if (terminate(sp, NULL, 1))
972 * Display current connections.
974 * PUBLIC: int cscope_display(SCR *);
977 cscope_display(SCR *sp)
984 if (SLIST_EMPTY(exp->cscq)) {
985 ex_printf(sp, "No cscope connections.\n");
988 SLIST_FOREACH(csc, exp->cscq, q)
989 ex_printf(sp, "%2d %s (process %lu)\n",
990 ++i, csc->dname, (u_long)csc->pid);
996 * Search a file for a cscope entry.
998 * PUBLIC: int cscope_search(SCR *, TAGQ *, TAG *);
1001 cscope_search(SCR *sp, TAGQ *tqp, TAG *tp)
1005 /* If we don't have a search pattern, use the line number. */
1006 if (tp->search == NULL) {
1007 if (!db_exist(sp, tp->slno)) {
1008 tag_msg(sp, TAG_BADLNO, tqp->tag);
1014 * Search for the tag; cheap fallback for C functions
1015 * if the name is the same but the arguments have changed.
1019 if (f_search(sp, &m, &m,
1020 tp->search, tp->slen, NULL, SEARCH_CSCOPE | SEARCH_FILE)) {
1021 tag_msg(sp, TAG_SEARCH, tqp->tag);
1027 * Historically, tags set the search direction if it wasn't
1030 if (sp->searchdir == NOTSET)
1031 sp->searchdir = FORWARD;
1036 * Tags move to the first non-blank, NOT the search pattern start.
1040 (void)nonblank(sp, sp->lno, &sp->cno);
1047 * Return a pointer to the command structure.
1050 lookup_ccmd(char *name)
1056 for (ccp = cscope_cmds; ccp->name != NULL; ++ccp)
1057 if (strncmp(name, ccp->name, len) == 0)
1064 * Read a prompt from cscope.
1067 read_prompt(SCR *sp, CSC *csc)
1071 #define CSCOPE_PROMPT ">> "
1074 getc(csc->from_fp)) != EOF && ch != CSCOPE_PROMPT[0]);
1076 terminate(sp, csc, 0);
1079 if (getc(csc->from_fp) != CSCOPE_PROMPT[1])
1081 if (getc(csc->from_fp) != CSCOPE_PROMPT[2])