v.in.ascii/points.c:
76 buflen = 400000; #Changed from 4000
77 buf = (char *)G_malloc(buflen);
78 buf_raw = (char *)G_malloc(buflen);
79 coorbuf = (char *)G_malloc(16*256); #Added 16*
80 tmp_token = (char *)G_malloc(16*256); #Added 16*
This change permitted me to read cleanly through an ascii file x,y,v1,v2...v4018
and import each of the x,y,v combinations as 3D vector layers
independently (without attribute table)
--
----
Yann Chemin wrote:
76 buflen = 400000; #Changed from 4000
77 buf = (char *)G_malloc(buflen);
78 buf_raw = (char *)G_malloc(buflen);
79 coorbuf = (char *)G_malloc(16*256); #Added 16*
80 tmp_token = (char *)G_malloc(16*256); #Added 16*This change permitted me to read cleanly through an ascii file x,y,v1,v2...v4018
and import each of the x,y,v combinations as 3D vector layers
independently (without attribute table)
If you have a need for many columns, it would be better to change it
to support any number of columns rather than simply increasing the
hard-coded limit to a larger value.
For a moderately-large number of columns, you'd need a version of
G_getl() which realloc()s its buffer as needed.
To cope with very large numbers of columns, the pull parser (reading a
line at a time) should be replaced by a push parser (reading
characters and pushing completed tokens into a state machine), e.g.:
for (;
{
int c = fgetc(fp);
if (c == EOF) { /* end of file */ }
else if (c == '\n') { /* new record */ }
else if (c == separator) { /* new field */ }
else { /* append c to current field */ }
}
--
Glynn Clements <glynn@gclements.plus.com>