2 * Iso2709 record management
4 * Europagate, 1994-1995.
7 * Revision 1.12 1995/03/29 16:08:56 adam
8 * Better error recovery when using bad records.
10 * Revision 1.11 1995/03/28 16:07:07 adam
11 * New function: iso2709_out. This function is the reverse of iso2709_cvt.
13 * Revision 1.10 1995/03/10 09:10:56 adam
14 * Removed dbc2709_cvt function. Makes heuristic guess for DBC2709 records.
16 * Revision 1.9 1995/03/08 12:36:39 adam
17 * New function: dbc2709_cvt.
19 * Revision 1.8 1995/03/08 12:03:15 adam
20 * Hack: When tags 00? are used, every separator (DC[1-3]) marks
21 * the end of the data field.
23 * Revision 1.7 1995/02/22 21:28:03 adam
26 * Revision 1.5 1995/02/22 15:24:14 adam
27 * Function iso2709_cvt makes a litte check for the format. It returns
28 * NULL if the buffer parameter can never be a MARC record.
30 * Revision 1.4 1995/02/15 17:45:44 adam
31 * Bug fix in iso2709 module.
33 * Revision 1.3 1995/02/10 17:05:18 adam
34 * New function iso2709_display to display MARC records in a
35 * line-by-line format. The iso2709_cvt function no longer
36 * prints the record to stderr.
38 * Revision 1.2 1995/02/10 16:50:32 adam
39 * Indicator field moved to 'struct iso2709_dir' from 'struct
41 * Function iso2709_rm implemented - to delete a MARC record.
43 * Revision 1.1.1.1 1995/02/09 17:27:11 adam
44 * Initial version of email gateway under CVS control.
56 static int atoin (const char *buf, int n)
62 val = val*10 + (*buf - '0');
68 static void strncpyx (char *d, const char *s, int n)
70 while (--n >= 0 && *s)
71 if (*s != ISO2709_IDFS)
81 char *iso2709_read (FILE *inf)
87 if (fread (length_str, 1, 5, inf) != 5)
89 size = atoin (length_str, 5);
92 if (!(buf = malloc (size+1)))
94 if (fread (buf+5, 1, size-5, inf) != (size-5))
99 memcpy (buf, length_str, 5);
105 Iso2709Rec iso2709_cvt (const char *buf)
107 struct iso2709_dir **dpp, *dp;
111 if (!(p = malloc (sizeof(*p))))
114 /* deal with record label (24 characters) */
115 p->record_length = atoin (buf, 5);
116 strncpyx (p->record_status, buf+5, 1);
117 strncpyx (p->implementation_codes, buf+6, 4);
118 p->indicator_length = atoin (buf+10, 1);
119 p->identifier_length = atoin (buf+11, 1);
120 p->base_address = atoin (buf+12, 4);
121 strncpyx (p->user_systems, buf+17, 3);
123 if (p->record_length < 26)
128 p->length_data_entry = atoin (buf+20, 1);
129 p->length_starting = atoin (buf+21, 1);
130 p->length_implementation = atoin (buf+22, 1);
131 strncpyx (p->future_use, buf+23, 1);
133 /* deal with directory */
136 while (buf[pos] != ISO2709_FS)
138 if (!(*dpp = malloc (sizeof(**dpp))))
144 (*dpp)->fields = NULL;
145 strncpyx ((*dpp)->tag, buf+pos, 3);
147 (*dpp)->length = atoin (buf+pos, p->length_data_entry);
148 pos += p->length_data_entry;
149 (*dpp)->offset = atoin (buf+pos, p->length_starting);
150 pos += p->length_starting + p->length_implementation;
153 if (pos > p->record_length)
160 /* deal with datafields */
161 for (dp = p->directory; dp; dp = dp->next)
164 struct iso2709_field **fpp;
165 int dpos = pos+dp->offset;
166 int epos = pos+dp->offset+dp->length-1;
170 if (!(*fpp = malloc (sizeof(**fpp))))
178 if (p->indicator_length)
181 if (buf[dpos+p->indicator_length] != ISO2709_IDFS)
184 if (!memcmp (dp->tag, "00", 2))
188 else if (!memcmp (dp->tag, "00", 2))
190 if (identifier_flag && p->indicator_length)
192 if (!(dp->indicator = malloc (p->indicator_length+1)))
197 strncpyx (dp->indicator, buf+dpos, p->indicator_length);
198 dpos += p->indicator_length;
201 dp->indicator = NULL;
205 if (p->identifier_length && identifier_flag)
207 if (!((*fpp)->identifier = malloc (p->identifier_length+1)))
212 strncpyx ((*fpp)->identifier, buf+dpos+1,
213 p->identifier_length-1);
214 dpos_n = dpos += p->identifier_length;
215 while (buf[dpos_n] != ISO2709_FS && buf[dpos_n] != ISO2709_RS
216 && buf[dpos_n] != ISO2709_IDFS && dpos_n < epos)
221 (*fpp)->identifier = NULL;
223 while (buf[dpos_n] != ISO2709_FS && buf[dpos_n] != ISO2709_RS
227 if (!((*fpp)->data = malloc (dpos_n - dpos + 1)))
232 strncpyx ((*fpp)->data, buf+dpos, dpos_n - dpos);
237 if (buf[dpos] != ISO2709_FS && buf[dpos] != ISO2709_RS)
238 fprintf (stderr, "Missing separator at end of field "
239 "in %s %s\n", dp->tag, (*fpp)->identifier ?
240 (*fpp)->identifier : "");
243 if (buf[dpos] == ISO2709_FS || buf[dpos] == ISO2709_RS)
245 fprintf (stderr, "Unexpected separator inside field\n");
249 if (!(*fpp = malloc (sizeof(**fpp))))
260 void iso2709_rm (Iso2709Rec rec)
262 struct iso2709_dir *dir, *dir1;
264 for (dir = rec->directory; dir; dir = dir1)
266 struct iso2709_field *field, *field1;
268 for (field = dir->fields; field; field = field1)
270 free (field->identifier);
272 field1 = field->next;
275 free (dir->indicator);