2 * Iso2709 record management
4 * Europagate, 1994-1995.
7 * Revision 1.13 1995/03/30 07:33:32 adam
8 * New 2709 function: iso2709_mk.
9 * First implementation of iso2709_a_insert.
11 * Revision 1.12 1995/03/29 16:08:56 adam
12 * Better error recovery when using bad records.
14 * Revision 1.11 1995/03/28 16:07:07 adam
15 * New function: iso2709_out. This function is the reverse of iso2709_cvt.
17 * Revision 1.10 1995/03/10 09:10:56 adam
18 * Removed dbc2709_cvt function. Makes heuristic guess for DBC2709 records.
20 * Revision 1.9 1995/03/08 12:36:39 adam
21 * New function: dbc2709_cvt.
23 * Revision 1.8 1995/03/08 12:03:15 adam
24 * Hack: When tags 00? are used, every separator (DC[1-3]) marks
25 * the end of the data field.
27 * Revision 1.7 1995/02/22 21:28:03 adam
30 * Revision 1.5 1995/02/22 15:24:14 adam
31 * Function iso2709_cvt makes a litte check for the format. It returns
32 * NULL if the buffer parameter can never be a MARC record.
34 * Revision 1.4 1995/02/15 17:45:44 adam
35 * Bug fix in iso2709 module.
37 * Revision 1.3 1995/02/10 17:05:18 adam
38 * New function iso2709_display to display MARC records in a
39 * line-by-line format. The iso2709_cvt function no longer
40 * prints the record to stderr.
42 * Revision 1.2 1995/02/10 16:50:32 adam
43 * Indicator field moved to 'struct iso2709_dir' from 'struct
45 * Function iso2709_rm implemented - to delete a MARC record.
47 * Revision 1.1.1.1 1995/02/09 17:27:11 adam
48 * Initial version of email gateway under CVS control.
60 static int atoin (const char *buf, int n)
66 val = val*10 + (*buf - '0');
72 static void strncpyx (char *d, const char *s, int n)
74 while (--n >= 0 && *s)
75 if (*s != ISO2709_IDFS)
85 char *iso2709_read (FILE *inf)
91 if (fread (length_str, 1, 5, inf) != 5)
93 size = atoin (length_str, 5);
96 if (!(buf = malloc (size+1)))
98 if (fread (buf+5, 1, size-5, inf) != (size-5))
103 memcpy (buf, length_str, 5);
108 Iso2709Rec iso2709_mk (void)
112 if (!(p = malloc (sizeof(*p))))
115 p->record_length = 0;
116 strncpyx (p->record_status, " ", 1);
117 strncpyx (p->implementation_codes, " ", 4);
118 p->indicator_length = 2;
119 p->identifier_length = 2;
121 strncpyx (p->user_systems, " ", 3);
122 p->length_data_entry = 4;
123 p->length_starting = 5;
124 p->length_implementation = 0;
125 strncpyx (p->future_use, " ", 1);
131 Iso2709Rec iso2709_cvt (const char *buf)
133 struct iso2709_dir **dpp, *dp;
137 if (!(p = malloc (sizeof(*p))))
140 /* deal with record label (24 characters) */
141 p->record_length = atoin (buf, 5);
142 strncpyx (p->record_status, buf+5, 1);
143 strncpyx (p->implementation_codes, buf+6, 4);
144 p->indicator_length = atoin (buf+10, 1);
145 p->identifier_length = atoin (buf+11, 1);
146 p->base_address = atoin (buf+12, 4);
147 strncpyx (p->user_systems, buf+17, 3);
149 if (p->record_length < 26)
154 p->length_data_entry = atoin (buf+20, 1);
155 p->length_starting = atoin (buf+21, 1);
156 p->length_implementation = atoin (buf+22, 1);
157 strncpyx (p->future_use, buf+23, 1);
159 /* deal with directory */
162 while (buf[pos] != ISO2709_FS)
164 if (!(*dpp = malloc (sizeof(**dpp))))
170 (*dpp)->fields = NULL;
171 strncpyx ((*dpp)->tag, buf+pos, 3);
173 (*dpp)->length = atoin (buf+pos, p->length_data_entry);
174 pos += p->length_data_entry;
175 (*dpp)->offset = atoin (buf+pos, p->length_starting);
176 pos += p->length_starting + p->length_implementation;
179 if (pos > p->record_length)
186 /* deal with datafields */
187 for (dp = p->directory; dp; dp = dp->next)
190 struct iso2709_field **fpp;
191 int dpos = pos+dp->offset;
192 int epos = pos+dp->offset+dp->length-1;
196 if (!(*fpp = malloc (sizeof(**fpp))))
204 if (p->indicator_length)
207 if (buf[dpos+p->indicator_length] != ISO2709_IDFS)
210 if (!memcmp (dp->tag, "00", 2))
214 else if (!memcmp (dp->tag, "00", 2))
216 if (identifier_flag && p->indicator_length)
218 if (!(dp->indicator = malloc (p->indicator_length+1)))
223 strncpyx (dp->indicator, buf+dpos, p->indicator_length);
224 dpos += p->indicator_length;
227 dp->indicator = NULL;
231 if (p->identifier_length && identifier_flag)
233 if (!((*fpp)->identifier = malloc (p->identifier_length+1)))
238 strncpyx ((*fpp)->identifier, buf+dpos+1,
239 p->identifier_length-1);
240 dpos_n = dpos += p->identifier_length;
241 while (buf[dpos_n] != ISO2709_FS && buf[dpos_n] != ISO2709_RS
242 && buf[dpos_n] != ISO2709_IDFS && dpos_n < epos)
247 (*fpp)->identifier = NULL;
249 while (buf[dpos_n] != ISO2709_FS && buf[dpos_n] != ISO2709_RS
253 if (!((*fpp)->data = malloc (dpos_n - dpos + 1)))
258 strncpyx ((*fpp)->data, buf+dpos, dpos_n - dpos);
263 if (buf[dpos] != ISO2709_FS && buf[dpos] != ISO2709_RS)
264 fprintf (stderr, "Missing separator at end of field "
265 "in %s %s\n", dp->tag, (*fpp)->identifier ?
266 (*fpp)->identifier : "");
269 if (buf[dpos] == ISO2709_FS || buf[dpos] == ISO2709_RS)
271 fprintf (stderr, "Unexpected separator inside field\n");
275 if (!(*fpp = malloc (sizeof(**fpp))))
286 void iso2709_rm (Iso2709Rec rec)
288 struct iso2709_dir *dir, *dir1;
290 for (dir = rec->directory; dir; dir = dir1)
292 struct iso2709_field *field, *field1;
294 for (field = dir->fields; field; field = field1)
296 free (field->identifier);
298 field1 = field->next;
301 free (dir->indicator);