/*- * Copyright (c) 1990, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Cimarron D. Taylor of the University of California, Berkeley. * * 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. 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. */ #ifndef lint static char sccsid[] = "@(#)function.c 8.10 (Berkeley) 5/4/95"; #endif /* not lint */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "find.h" #define COMPARE(a, b) { \ switch (plan->flags) { \ case F_EQUAL: \ return (a == b); \ case F_LESSTHAN: \ return (a < b); \ case F_GREATER: \ return (a > b); \ default: \ abort(); \ } \ } static PLAN *palloc __P((enum ntype, int (*) __P((PLAN *, FTSENT *)))); /* * find_parsenum -- * Parse a string of the form [+-]# and return the value. */ static long long find_parsenum(plan, option, vp, endch) PLAN *plan; char *option, *vp, *endch; { long long value; char *endchar, *str; /* Pointer to character ending conversion. */ /* Determine comparison from leading + or -. */ str = vp; switch (*str) { case '+': ++str; plan->flags = F_GREATER; break; case '-': ++str; plan->flags = F_LESSTHAN; break; default: plan->flags = F_EQUAL; break; } /* * Convert the string with strtoq(). Note, if strtoq() returns zero * and endchar points to the beginning of the string we know we have * a syntax error. */ value = strtoq(str, &endchar, 10); if (value == 0 && endchar == str) errx(1, "%s: %s: illegal numeric value", option, vp); if (endchar[0] && (endch == NULL || endchar[0] != *endch)) errx(1, "%s: %s: illegal trailing character", option, vp); if (endch) *endch = endchar[0]; return (value); } /* * The value of n for the inode times (atime, ctime, and mtime) is a range, * i.e. n matches from (n - 1) to n 24 hour periods. This interacts with * -n, such that "-mtime -1" would be less than 0 days, which isn't what the * user wanted. Correct so that -1 is "less than 1". */ #define TIME_CORRECT(p, ttype) \ if ((p)->type == ttype && (p)->flags == F_LESSTHAN) \ ++((p)->t_data); /* * -atime n functions -- * * True if the difference between the file access time and the * current time is n 24 hour periods. */ int f_atime(plan, entry) PLAN *plan; FTSENT *entry; { extern time_t now; COMPARE((now - entry->fts_statp->st_atime + 86400 - 1) / 86400, plan->t_data); } PLAN * c_atime(arg) char *arg; { PLAN *new; ftsoptions &= ~FTS_NOSTAT; new = palloc(N_ATIME, f_atime); new->t_data = find_parsenum(new, "-atime", arg, NULL); TIME_CORRECT(new, N_ATIME); return (new); } /* * -ctime n functions -- * * True if the difference between the last change of file * status information and the current time is n 24 hour periods. */ int f_ctime(plan, entry) PLAN *plan; FTSENT *entry; { extern time_t now; COMPARE((now - entry->fts_statp->st_ctime + 86400 - 1) / 86400, plan->t_data); } PLAN * c_ctime(arg) char *arg; { PLAN *new; ftsoptions &= ~FTS_NOSTAT; new = palloc(N_CTIME, f_ctime); new->t_data = find_parsenum(new, "-ctime", arg, NULL); TIME_CORRECT(new, N_CTIME); return (new); } /* * -depth functions -- * * Always true, causes descent of the directory hierarchy to be done * so that all entries in a directory are acted on before the directory * itself. */ int f_always_true(plan, entry) PLAN *plan; FTSENT *entry; { return (1); } PLAN * c_depth() { isdepth = 1; return (palloc(N_DEPTH, f_always_true)); } /* * [-exec | -ok] utility [arg ... ] ; functions -- * * True if the executed utility returns a zero value as exit status. * The end of the primary expression is delimited by a semicolon. If * "{}" occurs anywhere, it gets replaced by the current pathname. * The current directory for the execution of utility is the same as * the current directory when the find utility was started. * * The primary -ok is different in that it requests affirmation of the * user before executing the utility. */ int f_exec(plan, entry) register PLAN *plan; FTSENT *entry; { extern int dotfd; register int cnt; pid_t pid; int status; for (cnt = 0; plan->e_argv[cnt]; ++cnt) if (plan->e_len[cnt]) brace_subst(plan->e_orig[cnt], &plan->e_argv[cnt], entry->fts_path, plan->e_len[cnt]); if (plan->flags == F_NEEDOK && !queryuser(plan->e_argv)) return (0); /* make sure find output is interspersed correctly with subprocesses */ fflush(stdout); switch (pid = vfork()) { case -1: err(1, "fork"); /* NOTREACHED */ case 0: if (fchdir(dotfd)) { warn("chdir"); _exit(1); } execvp(plan->e_argv[0], plan->e_argv); warn("%s", plan->e_argv[0]); _exit(1); } pid = waitpid(pid, &status, 0); return (pid != -1 && WIFEXITED(status) && !WEXITSTATUS(status)); } /* * c_exec -- * build three parallel arrays, one with pointers to the strings passed * on the command line, one with (possibly duplicated) pointers to the * argv array, and one with integer values that are lengths of the * strings, but also flags meaning that the string has to be massaged. */ PLAN * c_exec(argvp, isok) char ***argvp; int isok; { PLAN *new; /* node returned */ register int cnt; register char **argv, **ap, *p; isoutput = 1; new = palloc(N_EXEC, f_exec); if (isok) new->flags = F_NEEDOK; for (ap = argv = *argvp;; ++ap) { if (!*ap) errx(1, "%s: no terminating \";\"", isok ? "-ok" : "-exec"); if (**ap == ';') break; } cnt = ap - *argvp + 1; new->e_argv = (char **)emalloc((u_int)cnt * sizeof(char *)); new->e_orig = (char **)emalloc((u_int)cnt * sizeof(char *)); new->e_len = (int *)emalloc((u_int)cnt * sizeof(int)); for (argv = *argvp, cnt = 0; argv < ap; ++argv, ++cnt) { new->e_orig[cnt] = *argv; for (p = *argv; *p; ++p) if (p[0] == '{' && p[1] == '}') { new->e_argv[cnt] = emalloc((u_int)MAXPATHLEN); new->e_len[cnt] = MAXPATHLEN; break; } if (!*p) { new->e_argv[cnt] = *argv; new->e_len[cnt] = 0; } } new->e_argv[cnt] = new->e_orig[cnt] = NULL; *argvp = argv + 1; return (new); } /* * -execdir utility [arg ... ] ; functions -- * * True if the executed utility returns a zero value as exit status. * The end of the primary expression is delimited by a semicolon. If * "{}" occurs anywhere, it gets replaced by the unqualified pathname. * The current directory for the execution of utility is the same as * the directory where the file lives. */ int f_execdir(plan, entry) register PLAN *plan; FTSENT *entry; { extern int dotfd; register int cnt; pid_t pid; int status; char *file; /* XXX - if file/dir ends in '/' this will not work -- can it? */ if ((file = strrchr(entry->fts_path, '/'))) file++; else file = entry->fts_path; for (cnt = 0; plan->e_argv[cnt]; ++cnt) if (plan->e_len[cnt]) brace_subst(plan->e_orig[cnt], &plan->e_argv[cnt], file, plan->e_len[cnt]); /* don't mix output of command with find output */ fflush(stdout); fflush(stderr); switch (pid = vfork()) { case -1: err(1, "fork"); /* NOTREACHED */ case 0: execvp(plan->e_argv[0], plan->e_argv); warn("%s", plan->e_argv[0]); _exit(1); } pid = waitpid(pid, &status, 0); return (pid != -1 && WIFEXITED(status) && !WEXITSTATUS(status)); } /* * c_execdir -- * build three parallel arrays, one with pointers to the strings passed * on the command line, one with (possibly duplicated) pointers to the * argv array, and one with integer values that are lengths of the * strings, but also flags meaning that the string has to be massaged. */ PLAN * c_execdir(argvp) char ***argvp; { PLAN *new; /* node returned */ register int cnt; register char **argv, **ap, *p; ftsoptions &= ~FTS_NOSTAT; isoutput = 1; new = palloc(N_EXECDIR, f_execdir); for (ap = argv = *argvp;; ++ap) { if (!*ap) errx(1, "-execdir: no terminating \";\""); if (**ap == ';') break; } cnt = ap - *argvp + 1; new->e_argv = (char **)emalloc((u_int)cnt * sizeof(char *)); new->e_orig = (char **)emalloc((u_int)cnt * sizeof(char *)); new->e_len = (int *)emalloc((u_int)cnt * sizeof(int)); for (argv = *argvp, cnt = 0; argv < ap; ++argv, ++cnt) { new->e_orig[cnt] = *argv; for (p = *argv; *p; ++p) if (p[0] == '{' && p[1] == '}') { new->e_argv[cnt] = emalloc((u_int)MAXPATHLEN); new->e_len[cnt] = MAXPATHLEN; break; } if (!*p) { new->e_argv[cnt] = *argv; new->e_len[cnt] = 0; } } new->e_argv[cnt] = new->e_orig[cnt] = NULL; *argvp = argv + 1; return (new); } /* * -follow functions -- * * Always true, causes symbolic links to be followed on a global * basis. */ PLAN * c_follow() { ftsoptions &= ~FTS_PHYSICAL; ftsoptions |= FTS_LOGICAL; return (palloc(N_FOLLOW, f_always_true)); } /* * -fstype functions -- * * True if the file is of a certain type. */ int f_fstype(plan, entry) PLAN *plan; FTSENT *entry; { static dev_t curdev; /* need a guaranteed illegal dev value */ static int first = 1; struct statfs sb; static int val_type, val_flags; char *p, save[2]; /* Only check when we cross mount point. */ if (first || curdev != entry->fts_statp->st_dev) { curdev = entry->fts_statp->st_dev; /* * Statfs follows symlinks; find wants the link's file system, * not where it points. */ if (entry->fts_info == FTS_SL || entry->fts_info == FTS_SLNONE) { if ((p = strrchr(entry->fts_accpath, '/')) != NULL) ++p; else p = entry->fts_accpath; save[0] = p[0]; p[0] = '.'; save[1] = p[1]; p[1] = '\0'; } else p = NULL; if (statfs(entry->fts_accpath, &sb)) err(1, "%s", entry->fts_accpath); if (p) { p[0] = save[0]; p[1] = save[1]; } first = 0; /* * Further tests may need both of these values, so * always copy both of them. */ val_flags = sb.f_flags; val_type = sb.f_type; } switch (plan->flags) { case F_MTFLAG: return (val_flags & plan->mt_data) != 0; case F_MTTYPE: return (val_type == plan->mt_data); default: abort(); } } PLAN * c_fstype(arg) char *arg; { register PLAN *new; struct vfsconf vfc; ftsoptions &= ~FTS_NOSTAT; new = palloc(N_FSTYPE, f_fstype); /* * Check first for a filesystem name. */ if (getvfsbyname(arg, &vfc) == 0) { new->flags = F_MTTYPE; new->mt_data = vfc.vfc_typenum; return (new); } switch (*arg) { case 'l': if (!strcmp(arg, "local")) { new->flags = F_MTFLAG; new->mt_data = MNT_LOCAL; return (new); } break; case 'r': if (!strcmp(arg, "rdonly")) { new->flags = F_MTFLAG; new->mt_data = MNT_RDONLY; return (new); } break; } errx(1, "%s: unknown file type", arg); /* NOTREACHED */ } /* * -group gname functions -- * * True if the file belongs to the group gname. If gname is numeric and * an equivalent of the getgrnam() function does not return a valid group * name, gname is taken as a group ID. */ int f_group(plan, entry) PLAN *plan; FTSENT *entry; { return (entry->fts_statp->st_gid == plan->g_data); } PLAN * c_group(gname) char *gname; { PLAN *new; struct group *g; gid_t gid; ftsoptions &= ~FTS_NOSTAT; g = getgrnam(gname); if (g == NULL) { gid = atoi(gname); if (gid == 0 && gname[0] != '0') errx(1, "-group: %s: no such group", gname); } else gid = g->gr_gid; new = palloc(N_GROUP, f_group); new->g_data = gid; return (new); } /* * -inum n functions -- * * True if the file has inode # n. */ int f_inum(plan, entry) PLAN *plan; FTSENT *entry; { COMPARE(entry->fts_statp->st_ino, plan->i_data); } PLAN * c_inum(arg) char *arg; { PLAN *new; ftsoptions &= ~FTS_NOSTAT; new = palloc(N_INUM, f_inum); new->i_data = find_parsenum(new, "-inum", arg, NULL); return (new); } /* * -links n functions -- * * True if the file has n links. */ int f_links(plan, entry) PLAN *plan; FTSENT *entry; { COMPARE(entry->fts_statp->st_nlink, plan->l_data); } PLAN * c_links(arg) char *arg; { PLAN *new; ftsoptions &= ~FTS_NOSTAT; new = palloc(N_LINKS, f_links); new->l_data = (nlink_t)find_parsenum(new, "-links", arg, NULL); return (new); } /* * -ls functions -- * * Always true - prints the current entry to stdout in "ls" format. */ int f_ls(plan, entry) PLAN *plan; FTSENT *entry; { printlong(entry->fts_path, entry->fts_accpath, entry->fts_statp); return (1); } PLAN * c_ls() { ftsoptions &= ~FTS_NOSTAT; isoutput = 1; return (palloc(N_LS, f_ls)); } /* * -mtime n functions -- * * True if the difference between the file modification time and the * current time is n 24 hour periods. */ int f_mtime(plan, entry) PLAN *plan; FTSENT *entry; { extern time_t now; COMPARE((now - entry->fts_statp->st_mtime + 86400 - 1) / 86400, plan->t_data); } PLAN * c_mtime(arg) char *arg; { PLAN *new; ftsoptions &= ~FTS_NOSTAT; new = palloc(N_MTIME, f_mtime); new->t_data = find_parsenum(new, "-mtime", arg, NULL); TIME_CORRECT(new, N_MTIME); return (new); } /* * -name functions -- * * True if the basename of the filename being examined * matches pattern using Pattern Matching Notation S3.14 */ int f_name(plan, entry) PLAN *plan; FTSENT *entry; { return (!fnmatch(plan->c_data, entry->fts_name, 0)); } PLAN * c_name(pattern) char *pattern; { PLAN *new; new = palloc(N_NAME, f_name); new->c_data = pattern; return (new); } /* * -newer file functions -- * * True if the current file has been modified more recently * then the modification time of the file named by the pathname * file. */ int f_newer(plan, entry) PLAN *plan; FTSENT *entry; { return (entry->fts_statp->st_mtime > plan->t_data); } PLAN * c_newer(filename) char *filename; { PLAN *new; struct stat sb; ftsoptions &= ~FTS_NOSTAT; if (stat(filename, &sb)) err(1, "%s", filename); new = palloc(N_NEWER, f_newer); new->t_data = sb.st_mtime; return (new); } /* * -nogroup functions -- * * True if file belongs to a user ID for which the equivalent * of the getgrnam() 9.2.1 [POSIX.1] function returns NULL. */ int f_nogroup(plan, entry) PLAN *plan; FTSENT *entry; { char *group_from_gid(); return (group_from_gid(entry->fts_statp->st_gid, 1) ? 0 : 1); } PLAN * c_nogroup() { ftsoptions &= ~FTS_NOSTAT; return (palloc(N_NOGROUP, f_nogroup)); } /* * -nouser functions -- * * True if file belongs to a user ID for which the equivalent * of the getpwuid() 9.2.2 [POSIX.1] function returns NULL. */ int f_nouser(plan, entry) PLAN *plan; FTSENT *entry; { char *user_from_uid(); return (user_from_uid(entry->fts_statp->st_uid, 1) ? 0 : 1); } PLAN * c_nouser() { ftsoptions &= ~FTS_NOSTAT; return (palloc(N_NOUSER, f_nouser)); } /* * -path functions -- * * True if the path of the filename being examined * matches pattern using Pattern Matching Notation S3.14 */ int f_path(plan, entry) PLAN *plan; FTSENT *entry; { return (!fnmatch(plan->c_data, entry->fts_path, 0)); } PLAN * c_path(pattern) char *pattern; { PLAN *new; new = palloc(N_NAME, f_path); new->c_data = pattern; return (new); } /* * -perm functions -- * * The mode argument is used to represent file mode bits. If it starts * with a leading digit, it's treated as an octal mode, otherwise as a * symbolic mode. */ int f_perm(plan, entry) PLAN *plan; FTSENT *entry; { mode_t mode; mode = entry->fts_statp->st_mode & (S_ISUID|S_ISGID|S_ISTXT|S_IRWXU|S_IRWXG|S_IRWXO); if (plan->flags == F_ATLEAST) return ((plan->m_data | mode) == mode); else return (mode == plan->m_data); /* NOTREACHED */ } PLAN * c_perm(perm) char *perm; { PLAN *new; mode_t *set; ftsoptions &= ~FTS_NOSTAT; new = palloc(N_PERM, f_perm); if (*perm == '-') { new->flags = F_ATLEAST; ++perm; } if ((set = setmode(perm)) == NULL) err(1, "-perm: %s: illegal mode string", perm); new->m_data = getmode(set, 0); return (new); } /* * -print functions -- * * Always true, causes the current pathame to be written to * standard output. */ int f_print(plan, entry) PLAN *plan; FTSENT *entry; { (void)puts(entry->fts_path); return (1); } PLAN * c_print() { isoutput = 1; return (palloc(N_PRINT, f_print)); } /* * -print0 functions -- * * Always true, causes the current pathame to be written to * standard output followed by a NUL character */ int f_print0(plan, entry) PLAN *plan; FTSENT *entry; { fputs(entry->fts_path, stdout); fputc('\0', stdout); return (1); } PLAN * c_print0() { isoutput = 1; return (palloc(N_PRINT0, f_print0)); } /* * -prune functions -- * * Prune a portion of the hierarchy. */ int f_prune(plan, entry) PLAN *plan; FTSENT *entry; { extern FTS *tree; if (fts_set(tree, entry, FTS_SKIP)) err(1, "%s", entry->fts_path); return (1); } PLAN * c_prune() { return (palloc(N_PRUNE, f_prune)); } /* * -size n[c] functions -- * * True if the file size in bytes, divided by an implementation defined * value and rounded up to the next integer, is n. If n is followed by * a c, the size is in bytes. */ #define FIND_SIZE 512 static int divsize = 1; int f_size(plan, entry) PLAN *plan; FTSENT *entry; { off_t size; size = divsize ? (entry->fts_statp->st_size + FIND_SIZE - 1) / FIND_SIZE : entry->fts_statp->st_size; COMPARE(size, plan->o_data); } PLAN * c_size(arg) char *arg; { PLAN *new; char endch; ftsoptions &= ~FTS_NOSTAT; new = palloc(N_SIZE, f_size); endch = 'c'; new->o_data = find_parsenum(new, "-size", arg, &endch); if (endch == 'c') divsize = 0; return (new); } /* * -type c functions -- * * True if the type of the file is c, where c is b, c, d, p, f or w * for block special file, character special file, directory, FIFO, * regular file or whiteout respectively. */ int f_type(plan, entry) PLAN *plan; FTSENT *entry; { return ((entry->fts_statp->st_mode & S_IFMT) == plan->m_data); } PLAN * c_type(typestring) char *typestring; { PLAN *new; mode_t mask; ftsoptions &= ~FTS_NOSTAT; switch (typestring[0]) { case 'b': mask = S_IFBLK; break; case 'c': mask = S_IFCHR; break; case 'd': mask = S_IFDIR; break; case 'f': mask = S_IFREG; break; case 'l': mask = S_IFLNK; break; case 'p': mask = S_IFIFO; break; case 's': mask = S_IFSOCK; break; #ifdef FTS_WHITEOUT case 'w': mask = S_IFWHT; ftsoptions |= FTS_WHITEOUT; break; #endif /* FTS_WHITEOUT */ default: errx(1, "-type: %s: unknown type", typestring); } new = palloc(N_TYPE, f_type); new->m_data = mask; return (new); } /* * -delete functions -- * * True always. Makes it's best shot and continues on regardless. */ int f_delete(plan, entry) PLAN *plan; FTSENT *entry; { /* ignore these from fts */ if (strcmp(entry->fts_accpath, ".") == 0 || strcmp(entry->fts_accpath, "..") == 0) return (1); /* sanity check */ if (isdepth == 0 || /* depth off */ (ftsoptions & FTS_NOSTAT) || /* not stat()ing */ !(ftsoptions & FTS_PHYSICAL) || /* physical off */ (ftsoptions & FTS_LOGICAL)) /* or finally, logical on */ errx(1, "-delete: insecure options got turned on"); /* Potentially unsafe - do not accept relative paths whatsoever */ if (strchr(entry->fts_accpath, '/') != NULL) errx(1, "-delete: %s: relative path potentially not safe", entry->fts_accpath); /* Turn off user immutable bits if running as root */ if ((entry->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) && !(entry->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)) && geteuid() == 0) chflags(entry->fts_accpath, entry->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE)); /* rmdir directories, unlink everything else */ if (S_ISDIR(entry->fts_statp->st_mode)) { if (rmdir(entry->fts_accpath) < 0 && errno != ENOTEMPTY) warn("-delete: rmdir(%s)", entry->fts_path); } else { if (unlink(entry->fts_accpath) < 0) warn("-delete: unlink(%s)", entry->fts_path); } /* "succeed" */ return (1); } PLAN * c_delete() { ftsoptions &= ~FTS_NOSTAT; /* no optimise */ ftsoptions |= FTS_PHYSICAL; /* disable -follow */ ftsoptions &= ~FTS_LOGICAL; /* disable -follow */ isoutput = 1; /* possible output */ isdepth = 1; /* -depth implied */ return (palloc(N_DELETE, f_delete)); } /* * -user uname functions -- * * True if the file belongs to the user uname. If uname is numeric and * an equivalent of the getpwnam() S9.2.2 [POSIX.1] function does not * return a valid user name, uname is taken as a user ID. */ int f_user(plan, entry) PLAN *plan; FTSENT *entry; { return (entry->fts_statp->st_uid == plan->u_data); } PLAN * c_user(username) char *username; { PLAN *new; struct passwd *p; uid_t uid; ftsoptions &= ~FTS_NOSTAT; p = getpwnam(username); if (p == NULL) { uid = atoi(username); if (uid == 0 && username[0] != '0') errx(1, "-user: %s: no such user", username); } else uid = p->pw_uid; new = palloc(N_USER, f_user); new->u_data = uid; return (new); } /* * -xdev functions -- * * Always true, causes find not to decend past directories that have a * different device ID (st_dev, see stat() S5.6.2 [POSIX.1]) */ PLAN * c_xdev() { ftsoptions |= FTS_XDEV; return (palloc(N_XDEV, f_always_true)); } /* * ( expression ) functions -- * * True if expression is true. */ int f_expr(plan, entry) PLAN *plan; FTSENT *entry; { register PLAN *p; register int state; for (p = plan->p_data[0]; p && (state = (p->eval)(p, entry)); p = p->next); return (state); } /* * N_OPENPAREN and N_CLOSEPAREN nodes are temporary place markers. They are * eliminated during phase 2 of find_formplan() --- the '(' node is converted * to a N_EXPR node containing the expression and the ')' node is discarded. */ PLAN * c_openparen() { return (palloc(N_OPENPAREN, (int (*)())-1)); } PLAN * c_closeparen() { return (palloc(N_CLOSEPAREN, (int (*)())-1)); } /* * ! expression functions -- * * Negation of a primary; the unary NOT operator. */ int f_not(plan, entry) PLAN *plan; FTSENT *entry; { register PLAN *p; register int state; for (p = plan->p_data[0]; p && (state = (p->eval)(p, entry)); p = p->next); return (!state); } PLAN * c_not() { return (palloc(N_NOT, f_not)); } /* * expression -o expression functions -- * * Alternation of primaries; the OR operator. The second expression is * not evaluated if the first expression is true. */ int f_or(plan, entry) PLAN *plan; FTSENT *entry; { register PLAN *p; register int state; for (p = plan->p_data[0]; p && (state = (p->eval)(p, entry)); p = p->next); if (state) return (1); for (p = plan->p_data[1]; p && (state = (p->eval)(p, entry)); p = p->next); return (state); } PLAN * c_or() { return (palloc(N_OR, f_or)); } static PLAN * palloc(t, f) enum ntype t; int (*f) __P((PLAN *, FTSENT *)); { PLAN *new; if ((new = malloc(sizeof(PLAN))) == NULL) err(1, NULL); new->type = t; new->eval = f; new->flags = 0; new->next = NULL; return (new); }