mirror of
https://github.com/Unidata/netcdf-c.git
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352 lines
11 KiB
C
352 lines
11 KiB
C
/*********************************************************************
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* Copyright 2009, UCAR/Unidata
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* See netcdf/COPYRIGHT file for copying and redistribution conditions.
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*********************************************************************/
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#include "includes.h"
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#include "odom.h"
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/******************************************************/
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/* Code for generating char variables etc; mostly
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language independent */
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/******************************************************/
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/*Forward*/
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static size_t gen_charconstant(NCConstant*, Bytebuffer*, int fillchar);
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static int getfillchar(Datalist* fillsrc);
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static void gen_leafchararray(Dimset*,int,Datalist*,Bytebuffer*, int);
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#if 0
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static void gen_chararrayr(Dimset*,int,int,Bytebuffer*,Datalist*,int,int,int);
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#endif
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static NCConstant* makeconst(int lineno, int len, char* str);
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/*
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Matching strings to char variables, attributes, and vlen
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constants is challenging because it is desirable to mimic
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the original ncgen(3). The "algorithms" used there have no
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simple characterization (such as "abc" == {'a','b','c'}).
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So, this rather ugly code is kept in this file
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and a variety of heuristics are used to mimic ncgen3.
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The core algorithm is as follows.
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1. Assume we have a set of dimensions D1..Dn.
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Any of the Di may be unlimited,
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but it is assumed that the sizes of the Di are all known.
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2. Given a sequence of string or character constants
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C1..Cm, our goal is to construct a single string
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whose length is the cross product of D1 thru Dn.
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3. For purposes of this algorithm, character constants
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are treated as strings of size 1.
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4. Construct Dx = cross product of D1 thru D(n-1).
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5. For each constant Ci, add fill characters, if necessary,
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so that its length is a multiple of Dn.
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6. Concatenate the modified C1..Cm to produce string S.
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7. Add fill characters to S to make its size be a multiple of
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Dn.
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8. If S is longer than the Dx * Dn, then truncate
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and generate a warning.
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Two special cases:
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1. character vlen: char(*) vlen_t.
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For this case, we simply concat all the elements.
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2. character attribute.
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For this case, we simply concat all the elements.
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*/
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void
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gen_chararray(Dimset* dimset, int dimindex, Datalist* data, Bytebuffer* charbuf, Datalist* fillsrc)
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{
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int fillchar = getfillchar(fillsrc);
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int rank = rankfor(dimset);
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int firstunlim = findunlimited(dimset,0);
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int nunlim = countunlimited(dimset);
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int nc3unlim = (nunlim <= 1 && (firstunlim == 0 || firstunlim == rank)); /* netcdf-3 case of at most 1 unlim in 0th dimension */
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/* Case: netcdf3 case */
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if(nc3unlim) {
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gen_leafchararray(dimset,0,data,charbuf,fillchar);
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return;
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}
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/* else generate should have done all the hard work */
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gen_leafchararray(dimset,dimindex,data,charbuf,fillchar);
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}
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#if 0
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/* Recursive helper */
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static void
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gen_chararrayr(Dimset* dimset, int dimindex,
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Bytebuffer* databuf, Datalist* data, int fillchar,
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int unitsize, int expectedsize)
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{
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int i;
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size_t dimsize = declsizefor(dimset,dimindex);
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int rank = dimset->ndims;
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int firstunlim = findunlimited(dimset,0);
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int lastunlimited = findlastunlimited(dimset);
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int nextunlimited = findunlimited(dimset,dimindex+1);
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int islastgroup = (lastunlimited == rank || dimindex >= lastunlimited || dimindex == rank-1);
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Odometer* subodom = NULL;
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ASSERT(rank > 0);
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ASSERT((islastgroup));
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/* we should be at a list of simple constants */
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for(i=0;i<data->length;i++) {
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NCConstant* c = datalistith(data,i);
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ASSERT(!islistconst(c));
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if(isstringable(c->nctype)) {
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int j;
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size_t constsize;
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constsize = gen_charconstant(c,databuf,fillchar);
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if(constsize % unitsize > 0) {
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size_t padsize = unitsize - (constsize % unitsize);
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for(j=0;j<padsize;j++) bbAppend(databuf,fillchar);
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}
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} else {
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semwarn(constline(c),
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"Encountered non-string and non-char constant in datalist; ignored");
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}
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}/* for */
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/* If |databuf| > expectedsize, complain: exception is zero length */
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if(bbLength(databuf) == 0 && expectedsize == 1) {
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/* this is okay */
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} else if(bbLength(databuf) > expectedsize) {
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semwarn(data->data[0].lineno,"character data list too long; expected %d character constant, found %d: ",expectedsize,bbLength(databuf));
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} else {
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size_t bufsize = bbLength(databuf);
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/* Pad to size dimproduct size */
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if(bufsize % expectedsize > 0) {
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size_t padsize = expectedsize - (bufsize % expectedsize);
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for(i=0;i<padsize;i++) bbAppend(databuf,fillchar);
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}
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}
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}
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#endif
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void
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gen_charattr(Datalist* data, Bytebuffer* databuf)
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{
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gen_charvlen(data,databuf);
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}
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void
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gen_charvlen(Datalist* data, Bytebuffer* databuf)
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{
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int i;
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NCConstant* c;
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ASSERT(bbLength(databuf) == 0);
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for(i=0;i<data->length;i++) {
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c = datalistith(data,i);
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if(isstringable(c->nctype)) {
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(void)gen_charconstant(c,databuf,NC_FILL_CHAR);
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} else {
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semerror(constline(c),
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"Encountered non-string and non-char constant in datalist");
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return;
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}
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}
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}
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static size_t
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gen_charconstant(NCConstant* con, Bytebuffer* databuf, int fillchar)
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{
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/* Following cases should be consistent with isstringable */
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size_t constsize = 1;
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switch (con->nctype) {
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case NC_CHAR:
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bbAppend(databuf,con->value.charv);
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break;
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case NC_BYTE:
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bbAppend(databuf,con->value.int8v);
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break;
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case NC_UBYTE:
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bbAppend(databuf,con->value.uint8v);
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break;
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case NC_STRING:
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constsize = con->value.stringv.len;
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bbAppendn(databuf,con->value.stringv.stringv,
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con->value.stringv.len);
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bbNull(databuf);
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break;
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case NC_FILL:
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bbAppend(databuf,fillchar);
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break;
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default:
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PANIC("unexpected constant type");
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}
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return constsize;
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}
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static int
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getfillchar(Datalist* fillsrc)
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{
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/* Determine the fill char */
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int fillchar = 0;
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if(fillsrc != NULL && fillsrc->length > 0) {
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NCConstant* ccon = fillsrc->data;
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if(ccon->nctype == NC_CHAR) {
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fillchar = ccon->value.charv;
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} else if(ccon->nctype == NC_STRING) {
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if(ccon->value.stringv.len > 0) {
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fillchar = ccon->value.stringv.stringv[0];
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}
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}
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}
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if(fillchar == 0) fillchar = NC_FILL_CHAR; /* default */
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return fillchar;
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}
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/* I think there is a flaw in the ncgen manual
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about handling something like this:
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dimensions:
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n = 8 ;
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variables:
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char cdata2(n) ;
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data:
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cdata2 = '\000','\001','\002','\177','\200','\201','\376','\377';
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The rules would say that each of the 8 char constants must
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be padded to length 8. I think this is only true if the dimension
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is unlimited, and even then, I am not sure.
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*/
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static void
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gen_leafchararray(Dimset* dimset, int dimindex, Datalist* data,
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Bytebuffer* charbuf, int fillchar)
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{
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int i;
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size_t expectedsize,xproduct,unitsize;
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int rank = rankfor(dimset);
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ASSERT(bbLength(charbuf) == 0);
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ASSERT((findlastunlimited(dimset) == rank
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|| findlastunlimited(dimset) == dimindex));
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/*
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There are a number of special cases that must be
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considered, mostly driven by the need to keep consistent
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with ncgen3. These cases are driven by the number of
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dimensions, which dimensions are unlimited (if any), etc.
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The general rule is based on the size of the last
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dimension, we compute the required size (after padding)
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of each string constant. Expected size is then the size
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of concat of the string constants after padding.
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There is another special case used for back compatibility with ncgen3.
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In the datalist, all sequences of character constants (i.e. 'X')
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are concatenated into a single string; the result, however is not
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concatenated with any trailing or leading string (with double quotes).
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*/
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/* Rebuild the datalist to merge 'x' constants */
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{
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int i,cccount = 0;
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/* Do initial walk */
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for(i=0;i<datalistlen(data);i++) {
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NCConstant* con = datalistith(data,i);
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if(consttype(con) == NC_CHAR || consttype(con) == NC_BYTE) {
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cccount++;
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}
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}
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if(cccount > 1) {
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char* accum = (char*)ecalloc(cccount+1);
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int len = 0;
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Datalist* newlist = builddatalist(datalistlen(data));
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int lineno = 0;
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NCConstant* con;
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for(i=0;i<datalistlen(data);i++) {
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con = datalistith(data,i);
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if(consttype(con) == NC_CHAR || consttype(con) == NC_BYTE) {
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if(len == 0)
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lineno = constline(con);
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accum[len] = con->value.charv;
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len++;
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} else {
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if(len > 0) {
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con = makeconst(lineno,len,accum);
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len = 0;
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lineno = 0;
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}
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dlappend(newlist,con);
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}
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}
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/* deal with any unclosed strings */
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if(len > 0) {
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con = makeconst(lineno,len,accum);
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len = 0;
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lineno = 0;
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dlappend(newlist,con);
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}
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free(accum);
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data = newlist;
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}
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}
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/* Compute crossproduct up to (but not including) the last dimension */
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xproduct = crossproduct(dimset,dimindex,rank-1);
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/* Start casing it out */
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if(rank == 0) {
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unitsize = 1;
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expectedsize = (xproduct * unitsize);
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} else if(rank == 1) {
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unitsize = 1;
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expectedsize = (xproduct * declsizefor(dimset,rank-1));
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} else if(isunlimited(dimset,rank-1)) {/* last dimension is unlimited */
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unitsize = 1;
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expectedsize = (xproduct*declsizefor(dimset,rank-1));
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} else { /* rank > 0 && last dim is not unlimited */
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unitsize = declsizefor(dimset,rank-1);
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expectedsize = (xproduct * unitsize);
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}
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for(i=0;i<data->length;i++) {
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NCConstant* c = datalistith(data,i);
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ASSERT(!islistconst(c));
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if(isstringable(c->nctype)) {
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int j;
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size_t constsize;
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constsize = gen_charconstant(c,charbuf,fillchar);
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if(constsize == 0 || constsize % unitsize > 0) {
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size_t padsize = unitsize - (constsize % unitsize);
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for(j=0;j<padsize;j++) bbAppend(charbuf,fillchar);
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}
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} else {
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semwarn(constline(c),"Encountered non-string and non-char constant in datalist; ignored");
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}
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}
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/* If |databuf| > expectedsize, complain: exception is zero length */
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if(bbLength(charbuf) == 0 && expectedsize == 1) {
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/* this is okay */
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} else if(bbLength(charbuf) > expectedsize) {
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semwarn(data->data[0].lineno,"character data list too long; expected %d character constant, found %d: ",expectedsize,bbLength(charbuf));
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} else {
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size_t bufsize = bbLength(charbuf);
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/* Pad to size dimproduct size */
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if(bufsize % expectedsize > 0) {
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size_t padsize = expectedsize - (bufsize % expectedsize);
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for(i=0;i<padsize;i++) bbAppend(charbuf,fillchar);
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}
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}
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}
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/* Create a new string constant */
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static NCConstant*
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makeconst(int lineno, int len, char* str)
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{
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NCConstant* con = (NCConstant*)ecalloc(sizeof(NCConstant));
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con->nctype = NC_STRING;
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con->lineno = lineno;
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con->filled = 0;
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con->value.stringv.len = len;
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/* We cannot use strdup because str might have embedded nuls */
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con->value.stringv.stringv = (char*)ecalloc(len+1);
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memcpy((void*)con->value.stringv.stringv,(void*)str,len);
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con->value.stringv.stringv[len] = '\0';
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return con;
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}
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