/* $OpenBSD: ex_cscope.c,v 1.6 2001/07/09 07:04:57 deraadt 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 #include /* XXX: param.h may not have included types.h */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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 __P((SCR *, EXCMD *, char *)); static int cscope_find __P((SCR *, EXCMD*, char *)); static int cscope_help __P((SCR *, EXCMD *, char *)); static int cscope_kill __P((SCR *, EXCMD *, char *)); static int cscope_reset __P((SCR *, EXCMD *, char *)); typedef struct _cc { char *name; int (*function) __P((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 __P((SCR *, char *, size_t *)); static int csc_help __P((SCR *, char *)); static void csc_file __P((SCR *, CSC *, char *, char **, size_t *, int *)); static int get_paths __P((SCR *, CSC *)); static CC const *lookup_ccmd __P((char *)); static int parse __P((SCR *, CSC *, TAGQ *, int *)); static int read_prompt __P((SCR *, CSC *)); static int run_cscope __P((SCR *, CSC *, char *)); static int start_cscopes __P((SCR *, EXCMD *)); static int terminate __P((SCR *, CSC *, int)); /* * ex_cscope -- * Perform an ex cscope. * * PUBLIC: int ex_cscope __P((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 (; *p && 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'; /* 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)) { terminate(sp, csc, 0); 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 (exp->cscq.lh_first == 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 (exp->tq.cqh_first == (void *)&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 = exp->cscq.lh_first; csc != NULL; csc = csc_next) { /* Copy csc->q.lh_next here in case csc is killed. */ csc_next = csc->q.le_next; /* * 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 = tqp->tagq.cqh_first; /* 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 (exp->tq.cqh_first == (void *)&exp->tq) { CIRCLEQ_INSERT_HEAD(&exp->tq, rtqp, q); } else rtqp = exp->tq.cqh_first; /* 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 characters to the pattern. */ for (p = pattern + 1; *p != '\0' && 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 = cbp->textq.cqh_first->lb; tlen = cbp->textq.cqh_first->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; if ((p = strchr(buf, '\n')) != NULL) *p = '\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: * * * * 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, "") == 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 = exp->cscq.lh_first; csc != NULL; csc = csc->q.le_next, 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); exp->cscq.lh_first != NULL;) if (cscope_kill(sp, cmdp, "1")) return (1); return (0); } /* * cscope_display -- * Display current connections. * * PUBLIC: int cscope_display __P((SCR *)); */ int cscope_display(sp) SCR *sp; { EX_PRIVATE *exp; CSC *csc; int i; exp = EXP(sp); if (exp->cscq.lh_first == NULL) { ex_printf(sp, "No cscope connections.\n"); return (0); } for (i = 1, csc = exp->cscq.lh_first; csc != NULL; ++i, csc = csc->q.le_next) ex_printf(sp, "%2d %s (process %lu)\n", i, csc->dname, (u_long)csc->pid); return (0); } /* * cscope_search -- * Search a file for a cscope entry. * * PUBLIC: int cscope_search __P((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); }