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/* Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/*
* OS Character I/O. This set of routines are provided as a workaround in
* the event that the host system cannot execute FTELL/FSEEK reliably (VMS/C
* could not). The idea here is to keep track of the character offset from
* the beginning of the file. K_FTELL returns the character offset. K_FSEEK
* rewinds the file and reads characters forward to the indicated offset.
* K_GETC keeps a count of the file position. (the k_ stands for kludge).
*/
extern int debug;
struct context {
FILE *fp; /* file descriptor */
long fpos; /* saved file pointer */
char fname[512]; /* file being scanned */
};
FILE *
k_fopen (fname, mode)
char *fname;
char *mode;
{
register struct context *cx;
register FILE *fp;
if ((fp = fopen (fname, mode)) == NULL)
return (NULL);
cx = (struct context *) malloc (sizeof(struct context));
strcpy (cx->fname, fname);
cx->fpos = 0;
cx->fp = fp;
return ((FILE *)cx);
}
int
k_fclose (cx_i)
FILE *cx_i;
{
register struct context *cx = (struct context *)cx_i;
int status;
status = fclose (cx->fp);
free (cx);
return (status);
}
#ifdef vms
int
k_getc (cx_i)
FILE *cx_i;
{
register struct context *cx = (struct context *)cx_i;
register int ch;
cx->fpos++;
if (debug > 3) {
if ((ch = getc (cx->fp)) > 0)
printf ("%5d %03o %c\n", cx->fpos, ch, ch > 040 ? ch : 040);
return (ch);
} else
return (getc (cx->fp));
}
char *
k_fgets (obuf, maxch, cx_i)
char *obuf;
int maxch;
FILE *cx_i;
{
register struct context *cx = (struct context *)cx_i;
register int ch, n;
register char *op;
for (op=obuf, n=maxch; --n >= 0; )
if ((ch = k_getc(cx)) < 0)
return (NULL);
else {
*op++ = ch;
if (ch == '\n')
break;
}
return (obuf);
}
seek
k_fseek (cx_i, offset, type)
FILE *cx_i;
long offset;
int type;
{
register struct context *cx = (struct context *)cx_i;
register FILE *fp = cx->fp;
register int ch;
if (debug > 1)
printf ("seek (%s, %ld, %d)\n", cx->fname, offset, type);
if (type == 0) {
fseek (fp, 0L, 0);
cx->fpos = 0;
while (cx->fpos < offset && (ch = getc(fp)) != EOF) {
if (debug > 1)
fputc (ch, stdout);
cx->fpos++;
}
if (debug > 1)
printf ("[]\n");
return (0);
}
if (fseek (fp, offset, type) == -1)
return (-1);
else {
cx->fpos = ftell (fp);
return (0);
}
}
long
k_ftell (cx_i)
FILE *cx_i;
{
register struct context *cx = (struct context *)cx_i;
if (debug > 1) {
printf ("ftell returns %d\n", cx->fpos);
fflush (stdout);
}
return (cx->fpos);
}
#else
int
k_getc (cx_i)
FILE *cx_i;
{
register struct context *cx = (struct context *)cx_i;
return (getc (cx->fp));
}
char *
k_fgets (op, maxch, cx_i)
char *op;
int maxch;
FILE *cx_i;
{
register struct context *cx = (struct context *)cx_i;
return (fgets (op, maxch, cx->fp));
}
int
k_fseek (cx_i, offset, type)
FILE *cx_i;
long offset;
int type;
{
register struct context *cx = (struct context *)cx_i;
return (fseek (cx->fp, offset, type));
}
int
k_ftell (cx_i)
FILE *cx_i;
{
register struct context *cx = (struct context *)cx_i;
return (ftell (cx->fp));
}
#endif
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