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The C Users' Group Library 1994 August
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wc-cdrom-cusersgrouplibrary-1994-08.iso
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vol_100
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170_01
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isamadd.c
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1979-12-31
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/*
** ISAMC - Written by John M. Dashner
*/
#include <stdio.h>
#include <ctype.h>
#include <isam.h>
/*
** ADD - Add an Index Record
*/
isamadd(key, rec, hdr)
char *key;
unsigned rec;
struct isam *hdr;
{
struct rec1 *r1; struct rec2 *r2; struct rec3 *r3;
char buf[MAXKEY + 2];
int i, fp;
unsigned cur_rec, chn_rec;
int rec_len;
long lrec;
rec_len = hdr->q6 + 2;
r1 = (struct rec1 *) buf;
r2 = (struct rec2 *) buf;
r3 = (struct rec3 *) buf;
fp = hdr->q7;
cur_rec = hdr->q1; /* tag to end of file */
hdr->q1 += 1; /* update record count */
lrec = cur_rec * rec_len;
lseek(fp, lrec, 0);
r3->rec_ptr = rec; /* build index record */
for(i=0;i<hdr->q6;i++)
r3->idx_key[i] = key[i];
if(write(fp, buf, rec_len) == ERROR)
{
isam_err = 8;
return ERROR;
}
hdr->q4 = cur_rec;
hdr->q5 = 1; /* mark as unsorted */
return NULL;
}