/* * $Id: info_file.c,v 5.2 90/06/23 22:19:29 jsp Rel $ * * 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 are permitted provided * that: (1) source distributions retain this entire copyright notice and * comment, and (2) distributions including binaries display the following * acknowledgement: ``This product includes software developed by the * University of California, Berkeley and its contributors'' in the * documentation or other materials provided with the distribution and in * all advertising materials mentioning features or use of this software. * 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. * * @(#)info_file.c 5.1 (Berkeley) 6/29/90 */ /* * Get info from file */ #include "am.h" #ifdef HAS_FILE_MAPS #include <ctype.h> #include <sys/stat.h> #define MAX_LINE_LEN 2048 static int read_line(buf, size, fp) 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; /* * 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(fp, map, key, val, m, fn) FILE *fp; char *map; char *key; char **val; mnt_map *m; void (*fn) P((mnt_map*, 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(*kp); kp++) ; /* * Ignore blank lines */ if (!*kp) goto again; /* * Find end of key */ for (cp = kp; *cp&&(!isascii(*cp)||!isspace(*cp)); cp++) ; /* * Check whether key matches */ if (*cp) *cp++ = '\0'; if ((*key == *kp && strcmp(key, kp) == 0) || fn) { while (*cp && isascii(*cp) && isspace(*cp)) cp++; if (*cp) { /* * Return a copy of the data */ char *dc = strdup(cp); if (fn) (*fn)(m, 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; } int file_init(map) char *map; { FILE *mapf = fopen(map, "r"); if (mapf) { (void) fclose(mapf); return 0; } return errno; } int file_reload(m, map, fn) mnt_map *m; char *map; void (*fn)(); { FILE *mapf = fopen(map, "r"); if (mapf) { int error = search_or_reload_file(mapf, map, 0, 0, m, fn); (void) fclose(mapf); return error; } return errno; } int file_search(m, map, key, pval, tp) mnt_map *m; char *map; char *key; char **pval; time_t *tp; { FILE *mapf = fopen(map, "r"); if (mapf) { struct stat stb; int error; error = fstat(fileno(mapf), &stb); if (!error && *tp < stb.st_mtime) { *tp = stb.st_mtime; error = -1; } else { error = search_or_reload_file(mapf, map, key, pval, 0, 0); } (void) fclose(mapf); return error; } return errno; } #endif /* HAS_FILE_MAPS */