2 * $Id: parse_mtab.c,v 1.2 2001-06-10 20:15:00 srittau Exp $
4 * afpd_mtab_parse & support. -- rgr, 9-Apr-01.
9 #endif /* HAVE_CONFIG_H */
17 #include "directory.h"
18 #include "parse_mtab.h"
20 #define MAX_AFPD_MTAB_ENTRIES 256 /* unreasonably large number */
21 #define MTAB_DELIM_CHARS " \t\n" /* delimiters for parsing */
24 #define COPY_STRING(lval, str) \
25 (lval) = malloc(1+strlen(str)), strcpy((lval), (str))
26 #endif /* COPY_STRING */
28 /* global mount table; afpd_st_cnid uses this to lookup the right entry. */
29 static struct afpd_mount_table *afpd_mount_table = NULL;
32 ceil_log_2 __P((int n))
33 /* Return the number of bits required to represent n. Only works for
46 afpd_st_cnid __P((struct stat *st))
47 /* Given a stat structure, look up the device in afpd_mount_table, and
48 compute and return a CNID. */
51 struct afpd_mtab_entry *entry;
53 if (afpd_mount_table != NULL) {
54 for (id = 0; id < afpd_mount_table->size; id++) {
55 entry = afpd_mount_table->table[id];
57 && entry->dev_major == major(st->st_dev)
58 && entry->dev_minor == minor(st->st_dev)) {
59 return(entry->bit_value | st->st_ino);
68 struct afpd_mount_table *
69 afpd_mtab_parse __P((char *file_name))
70 /* Parse the given mtab file, returning a new afpd_mount_table structure.
71 Also saves it in the afpd_mount_table static variable for use by the
72 afpd_st_cnid function. Returns NULL if it encounters an error.
74 [It would be great if this could generate a warning for any device that
75 allows more inodes than we can allocate bits for. -- rgr, 9-Apr-01.]
78 struct afpd_mtab_entry *entries[MAX_AFPD_MTAB_ENTRIES]; /* temp */
79 int id, max_id = 0, n_errors = 0;
81 char line[1000], *p, *index_tok, *dev_tok, *mount_tok;
82 int line_number = 0; /* one-based */
83 FILE *f = fopen(file_name, "r");
86 fprintf(stderr, "Error: Can't open %s: code %d\n",
90 for (id = 0; id < MAX_AFPD_MTAB_ENTRIES; id++)
92 while (fgets(line, sizeof(line), f) != NULL) {
95 if ((p = strchr(line, '#')) != NULL)
98 index_tok = strtok(line, MTAB_DELIM_CHARS);
99 dev_tok = strtok(NULL, MTAB_DELIM_CHARS);
100 mount_tok = strtok(NULL, MTAB_DELIM_CHARS);
101 if (mount_tok == NULL) {
102 /* [warning here if index_tok nonempty? -- rgr, 9-Apr-01.] */
104 else if (id = strtol(index_tok, &p, 10),
106 fprintf(stderr, "afpd:%s:%d: Non-integer device index value '%s'.\n",
107 file_name, line_number, index_tok);
110 else if (id < 1 || id > MAX_AFPD_MTAB_ENTRIES) {
112 "afpd:%s:%d: Expected an integer from 1 to %d, but got '%s'.\n",
113 file_name, line_number, MAX_AFPD_MTAB_ENTRIES-1, index_tok);
116 else if (entries[id] != NULL) {
119 "afpd:%s:%d: Id %d is already taken for %s.\n",
120 file_name, line_number, id, entries[id]->device);
123 else if (stat(dev_tok, &st) != 0) {
124 fprintf(stderr, "afpd:%s:%d: Can't stat '%s': code %d\n",
125 file_name, line_number, dev_tok, errno);
128 else if (! S_ISBLK(st.st_mode)) {
129 fprintf(stderr, "afpd:%s:%d: '%s' is not a block device.\n",
130 file_name, line_number, dev_tok);
134 /* make a new entry */
135 struct afpd_mtab_entry *entry
136 = (struct afpd_mtab_entry *) malloc(sizeof(struct afpd_mtab_entry));
139 entry->dev_major = major(st.st_rdev);
140 entry->dev_minor = minor(st.st_rdev);
141 COPY_STRING(entry->device, dev_tok);
142 COPY_STRING(entry->mount_point, mount_tok);
151 fprintf(stderr, "Got %d errors while reading %s; exiting.\n",
152 n_errors, file_name);
156 /* make the table. */
157 struct afpd_mount_table *mount_table /* return value */
158 = (struct afpd_mount_table *) malloc(sizeof(struct afpd_mount_table));
159 int n_bits = ceil_log_2(max_id);
161 struct afpd_mtab_entry **new_entries;
163 if (n_bits < AFPD_MTAB_MIN_DEV_BITS)
164 n_bits = AFPD_MTAB_MIN_DEV_BITS;
165 table_size = 1 << n_bits;
166 new_entries = (struct afpd_mtab_entry **)
167 malloc(table_size*sizeof(struct afpd_mtab_entry *));
168 mount_table->size = table_size;
169 mount_table->bits = n_bits;
170 mount_table->shift = AFPD_MTAB_DEV_AND_INODE_BITS-n_bits;
171 for (id = 0; id < table_size; id++) {
172 if (entries[id] != NULL)
173 entries[id]->bit_value = entries[id]->id << mount_table->shift;
174 new_entries[id] = entries[id];
176 mount_table->table = new_entries;
178 afpd_mount_table = mount_table;