/* $NetBSD: info_file.c,v 1.1.1.4 2001/05/13 17:50:14 veego Exp $ */ /* * Copyright (c) 1997-2001 Erez Zadok * Copyright (c) 1990 Jan-Simon Pendry * Copyright (c) 1990 Imperial College of Science, Technology & Medicine * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * Jan-Simon Pendry at Imperial College, London. * * 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 acknowledgment: * 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. * * %W% (Berkeley) %G% * * Id: info_file.c,v 1.3.2.2 2001/01/12 23:28:56 ro Exp * */ /* * Get info from file */ #ifdef HAVE_CONFIG_H # include #endif /* HAVE_CONFIG_H */ #include #include #define MAX_LINE_LEN 1500 /* forward declarations */ int file_init(mnt_map *m, char *map, time_t *tp); int file_reload(mnt_map *m, char *map, void (*fn) (mnt_map *, char *, char *)); int file_search(mnt_map *m, char *map, char *key, char **pval, time_t *tp); int file_mtime(mnt_map *m, char *map, time_t *tp); static int read_line(char *buf, int size, FILE *fp) { int done = 0; do { while (fgets(buf, size, fp)) { int len = strlen(buf); done += len; if (len > 1 && buf[len - 2] == '\\' && buf[len - 1] == '\n') { int ch; buf += len - 2; size -= len - 2; *buf = '\n'; buf[1] = '\0'; /* * Skip leading white space on next line */ while ((ch = getc(fp)) != EOF && isascii(ch) && isspace(ch)) ; (void) ungetc(ch, fp); } else { return done; } } } while (size > 0 && !feof(fp)); return done; } /* * Try to locate a key in a file */ static int search_or_reload_file(FILE *fp, char *map, char *key, char **val, mnt_map *m, void (*fn) (mnt_map *m, char *, char *)) { char key_val[MAX_LINE_LEN]; int chuck = 0; int line_no = 0; while (read_line(key_val, sizeof(key_val), fp)) { char *kp; char *cp; char *hash; int len = strlen(key_val); line_no++; /* * Make sure we got the whole line */ if (key_val[len - 1] != '\n') { plog(XLOG_WARNING, "line %d in \"%s\" is too long", line_no, map); chuck = 1; } else { key_val[len - 1] = '\0'; } /* * Strip comments */ hash = strchr(key_val, '#'); if (hash) *hash = '\0'; /* * Find start of key */ for (kp = key_val; *kp && isascii(*kp) && isspace((int)*kp); kp++) ; /* * Ignore blank lines */ if (!*kp) goto again; /* * Find end of key */ for (cp = kp; *cp && (!isascii(*cp) || !isspace((int)*cp)); cp++) ; /* * Check whether key matches */ if (*cp) *cp++ = '\0'; if (fn || (*key == *kp && STREQ(key, kp))) { while (*cp && isascii(*cp) && isspace((int)*cp)) cp++; if (*cp) { /* * Return a copy of the data */ char *dc = strdup(cp); if (fn) { (*fn) (m, strdup(kp), dc); } else { *val = dc; #ifdef DEBUG dlog("%s returns %s", key, dc); #endif /* DEBUG */ } if (!fn) return 0; } else { plog(XLOG_USER, "%s: line %d has no value field", map, line_no); } } again: /* * If the last read didn't get a whole line then * throw away the remainder before continuing... */ if (chuck) { while (fgets(key_val, sizeof(key_val), fp) && !strchr(key_val, '\n')) ; chuck = 0; } } return fn ? 0 : ENOENT; } static FILE * file_open(char *map, time_t *tp) { FILE *mapf = fopen(map, "r"); if (mapf && tp) { struct stat stb; if (fstat(fileno(mapf), &stb) < 0) *tp = clocktime(); else *tp = stb.st_mtime; } return mapf; } int file_init(mnt_map *m, char *map, time_t *tp) { FILE *mapf = file_open(map, tp); if (mapf) { fclose(mapf); return 0; } return errno; } int file_reload(mnt_map *m, char *map, void (*fn) (mnt_map *, char *, char *)) { FILE *mapf = file_open(map, (time_t *) 0); if (mapf) { int error = search_or_reload_file(mapf, map, 0, 0, m, fn); (void) fclose(mapf); return error; } return errno; } int file_search(mnt_map *m, char *map, char *key, char **pval, time_t *tp) { time_t t; FILE *mapf = file_open(map, &t); if (mapf) { int error; if (*tp < t) { *tp = t; error = -1; } else { error = search_or_reload_file(mapf, map, key, pval, 0, 0); } (void) fclose(mapf); return error; } return errno; } int file_mtime(mnt_map *m, char *map, time_t *tp) { FILE *mapf = file_open(map, tp); if (mapf) { (void) fclose(mapf); return 0; } return errno; }