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gautil.c
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gautil.c
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/* GrADS (Grid Analysis and Display System) Version 0.9.
Copyright (c) 1988, 1989, 1990 by Brian Doty (Center for Ocean-
Land-Atmosphere Interactions, Department of Meteorology,
University of Maryland, College Park, MD 20742). Permission is
granted to any individual or institution to use, copy, or
redistribute this software so long as it is not sold and all
copyright notices are retained. */
#include <stdio.h>
#include <math.h>
#include <malloc.h>
#include <limits.h>
#include "grads.h"
#include "gx.h"
#if READLINE == 1
#include <sys/types.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/errno.h>
#include "readline.h"
#include "history.h"
#endif
/*mf 961205 --- expose Mike Fiorino's global struct to these routines for 365 day calandars mf*/
/*-------- declare here vice grads.c because this is a common routine with LATS ------*/
struct gamfcmn mfcmn;
/*mf 961205 --- expose Mike Fiorino's global struct to these routines for 365 day calandars mf*/
static char pout[256]; /* Build Error msgs here */
/* Retrieves the next command from the user. Leading blanks
are stripped. The number of characters entered before the
CR is returned. */
int nxtcmd (char *cmd, char *prompt) {
int i,past,cnt;
static char *ch;
printf ("%s ",prompt);
past = 0;
cnt = 0;
while (1) {
*cmd = getchar();
if (*cmd == EOF) return (-1);
if (*cmd == '\n') {
cmd++;
*cmd = '\0';
return (cnt);
}
if (past || *cmd != ' ') {
cmd++; cnt++; past = 1;
}
}
}
/* Retrieves the next command from the user. Leading blanks
are stripped. The number of characters entered before the
CR is returned. */
#if READLINE == 1
int nxrdln (char *cmd, char *prompt) {
int i,past,cnt;
static char *ch;
ch=readline(prompt);
for(i=0;i<strlen(ch);i++) *(cmd+i)=*(ch+i);
*(cmd+strlen(ch))='\0';
add_history(ch);
free(ch);
return(strlen(cmd)+1);
}
#endif
/* Date/Time manipulation routines. Note that these routines
are not particularly efficient, thus Date/Time conversions
should be kept to a minimum. */
static int mosiz[13] = {0,31,28,31,30,31,30,31,31,30,31,30,31};
static int momn[13] = {0,44640,40320,44640,43200,44640,43200,
44640,44640,43200,44640,43200,44640};
static int mnacum[13] = {0,0,44640,84960,129600,172800,217440,
260640,305280,349920,393120,437760,480960};
static int mnacul[13] = {0,0,44640,86400,131040,174240,218880,
262080,306720,351360,394560,439200,482400};
/* Add an offset to a time. Output to dto. */
void timadd (struct dt *dtim, struct dt *dto) {
int i;
int cont;
/* First add months and years. Normalize as needed. */
dto->mo += dtim->mo;
dto->yr += dtim->yr;
while (dto->mo>12) {
dto->mo -= 12;
dto->yr++;
}
/* Add minutes, hours, and days directly. Then normalize
to days, then normalize extra days to months/years. */
dto->mn += dtim->mn;
dto->hr += dtim->hr;
dto->dy += dtim->dy;
if (dto->mn > 59) {
i = dto->mn / 60;
dto->hr += i;
dto->mn = dto->mn - (i*60);
}
if (dto->hr > 23) {
i = dto->hr / 24;
dto->dy += i;
dto->hr = dto->hr - (i*24);
}
cont = 1;
while (dto->dy > mosiz[dto->mo] && cont) {
if (dto->mo==2 && qleap(dto->yr)) {
if (dto->dy == 29) cont=0;
else {
dto->dy -= 29;
dto->mo++;
}
} else {
dto->dy -= mosiz[dto->mo];
dto->mo++;
}
while (dto->mo > 12) {dto->mo-=12; dto->yr++;}
}
}
/* Subtract an offset from a time. Subtract minutes/hours/days
first so that we will exactly reverse the operation of timadd */
void timsub (struct dt *dtim, struct dt *dto) {
int s1,s2;
/* Subtract minutes, hour, and days directly. Then normalize
to days, then normalize deficient days from months/years. */
dto->mn = dtim->mn - dto->mn;
dto->hr = dtim->hr - dto->hr;
dto->dy = dtim->dy - dto->dy;
s1 = dto->mo; s2 = dto->yr;
dto->mo = dtim->mo;
dto->yr = dtim->yr;
while (dto->mn < 0) {dto->mn+=60; dto->hr--;}
while (dto->hr < 0) {dto->hr+=24; dto->dy--;}
while (dto->dy < 1) {
dto->mo--;
if (dto->mo < 1) {dto->mo=12; dto->yr--;}
if (dto->mo==2 && qleap(dto->yr)) dto->dy += 29;
else dto->dy += mosiz[dto->mo];
}
/* Now subtract months and years. Normalize as needed. */
dto->mo = dto->mo - s1;
dto->yr = dto->yr - s2;
while (dto->mo < 1) {dto->mo+=12; dto->yr--;}
/* Adjust for leaps */
if (dto->mo==2 && dto->dy==29 && !qleap(dto->yr)) {
dto->mo=3; dto->dy=1;
}
}
/* Convert from Absolute time (year/month/day/etc.) to grid
coordinate. */
float t2gr (float *vals, struct dt *dtim) {
struct dt stim;
int eyear,mins;
float val,*moincr,*mnincr;
float rdiff;
/* Get constants associated with this conversion */
stim.yr = (int)(*vals+0.1);
stim.mo = (int)(*(vals+1)+0.1);
stim.dy = (int)(*(vals+2)+0.1);
stim.hr = (int)(*(vals+3)+0.1);
stim.mn = (int)(*(vals+4)+0.1);
moincr = vals+5;
mnincr = vals+6;
/* If the increment for this conversion is days, hours, or minutes,
then we do our calculations in minutes. If the increment is
months or years, we do our calculations in months. */
if (*mnincr>0.1) {
mins = timdif(&stim,dtim);
rdiff = (float)mins;
val = rdiff/(*mnincr);
val += 1.0;
return (val);
} else {
eyear = stim.yr;
if (stim.yr > dtim->yr) eyear = dtim->yr;
rdiff = (((dtim->yr - eyear)*12) + dtim->mo) -
(((stim.yr - eyear)*12) + stim.mo);
stim.yr = dtim->yr;
stim.mo = dtim->mo;
mins = timdif(&stim,dtim);
if (mins>0) {
if (dtim->mo==2 && qleap(dtim->yr) ) {
rdiff = rdiff + (((float)mins)/41760.0);
} else {
rdiff = rdiff + (((float)mins)/((float)momn[dtim->mo]));
}
}
val = rdiff/(*moincr);
val += 1.0;
return (val);
}
}
/* Convert from a t grid coordinate to an absolute time. */
void gr2t (float *vals, float gr, struct dt *dtim) {
struct dt stim;
float *moincr,*mnincr;
float v;
/* Get constants associated with this conversion */
stim.yr = (int)(*vals+0.1);
stim.mo = (int)(*(vals+1)+0.1);
stim.dy = (int)(*(vals+2)+0.1);
stim.hr = (int)(*(vals+3)+0.1);
stim.mn = (int)(*(vals+4)+0.1);
moincr = vals+5;
mnincr = vals+6;
/* Initialize output time */
dtim->yr = 0;
dtim->mo = 0;
dtim->dy = 0;
dtim->hr = 0;
dtim->mn = 0;
/* Do conversion if increment is in minutes. */
if (*mnincr>0.1) {
v = *mnincr * (gr-1.0);
if (v>0.0) v = v + 0.5; /* round */
else v = v - 0.5;
dtim->mn = (int)v;
if (dtim->mn<0) {
dtim->mn = -1 * dtim->mn;
timsub (&stim,dtim);
} else {
timadd (&stim,dtim);
}
return;
/* Do conversion if increment is in months. Same as for minutes,
except special handling is required for partial months. */
} else {
v = *moincr * (gr-1.0);
if (v<0.0) dtim->mo = (int)(v-0.9999); /* round (sort of) */
else dtim->mo = (int)(v+0.0001);
v = v - (float)dtim->mo; /* Get fractional month */
if (dtim->mo<0) {
dtim->mo = -1 * dtim->mo;
timsub (&stim,dtim);
} else timadd (&stim,dtim);
if (v<0.0001) return; /* if fraction small, return */
if (dtim->mo==2 && qleap(dtim->yr) ) {
v = v * 41760.0;
} else {
v = v * (float)momn[dtim->mo];
}
stim = *dtim;
dtim->yr = 0;
dtim->mo = 0;
dtim->dy = 0;
dtim->hr = 0;
dtim->mn = (int)(v+0.5);
timadd (&stim,dtim);
return;
}
}
/* Calculate the difference between two times and return the
difference in minutes. The calculation is time2 - time1, so
if time2 is earlier than time1, the result is negative. */
int timdif (struct dt *dtim1, struct dt *dtim2) {
int min1,min2,yr;
struct dt *temp;
int swap,mo1,mo2;
swap = 0;
if (dtim1->yr > dtim2->yr) {
temp = dtim1;
dtim1 = dtim2;
dtim2 = temp;
swap = 1;
}
min1 = 0;
min2 = 0;
yr = dtim1->yr;
while (yr < dtim2->yr) {
if (qleap(yr)) min2 += 527040L;
else min2 += 525600L;
yr++;
}
mo1 = dtim1->mo;
mo2 = dtim2->mo;
if (qleap(dtim1->yr)) {
min1 = min1+mnacul[mo1]+(dtim1->dy*1440L)+(dtim1->hr*60L)+dtim1->mn;
} else {
min1 = min1+mnacum[mo1]+(dtim1->dy*1440L)+(dtim1->hr*60L)+dtim1->mn;
}
if (qleap(dtim2->yr)) {
min2 = min2+mnacul[mo2]+(dtim2->dy*1440L)+(dtim2->hr*60L)+dtim2->mn;
} else {
min2 = min2+mnacum[mo2]+(dtim2->dy*1440L)+(dtim2->hr*60L)+dtim2->mn;
}
if (swap) return (min1-min2);
else return (min2-min1);
}
/* Test for leap year. Rules are:
Divisible by 4, it is a leap year, unless....
Divisible by 100, it is not a leap year, unless...
Divisible by 400, it is a leap year. */
int qleap (int year) {
int i,y;
/*mf - disable if 365 day calendar mf*/
if(mfcmn.cal365) return(0);
y = year;
i = y / 4;
i = (i*4) - y;
if (i!=0) return (0);
i = y / 100;
i = (i*100) - y;
if (i!=0) return (1);
i = y / 400;
i = (i*400) - y;
if (i!=0) return (0);
return (1);
}
char *mons[12] = {"jan","feb","mar","apr","may","jun","jul","aug",
"sep","oct","nov","dec"};
/* Parse an absolute date/time value. Format is:
12:00z 1jan 1989 (jan,feb,mar,apr,may,jun,jul,aug,sep,oct,nov,dec)
Must have Z or Month abbrev, or value is invalid. 'def' contains
higher order missing values (usually from tmin in pst). Lower order
values are defaulted to be: dy = 1, hr = 0, mn = 0. */
char *adtprs (char *ch, struct dt *def, struct dt *dtim) {
int val,flag,i;
char *pos;
char monam[5];
pos = ch;
dtim->mn = 0;
dtim->hr = 0;
dtim->dy = 1;
if (*ch>='0' && *ch<='9') {
flag = 0;
ch = intprs (ch,&val);
if (*ch == ':' || *ch == 'z') {
if (val>23) {
gaprnt (0,"Syntax Error: Invalid Date/Time value.\n");
sprintf (pout," Hour = %i -- greater than 23\n",val);
gaprnt (0,pout);
return (NULL);
}
dtim->hr = val;
if (*ch == ':') {
ch++;
if (*ch>='0' && *ch<='9') {
ch = intprs (ch,&val);
if (val>59) {
gaprnt (0,"Syntax Error: Invalid Date/Time value.\n");
sprintf (pout," Minute = %i -- greater than 59\n",val);
gaprnt (0,pout);
return (NULL);
}
if (*ch!='z') {
gaprnt (0,"Syntax Error: Invalid Date/Time value.\n");
gaprnt (0," 'z' delimiter is missing \n");
return (NULL);
}
dtim->mn = val;
ch++;
if (*ch>='0' && *ch<='9') ch = intprs (ch,&val);
else val = def->dy;
} else {
gaprnt (0,"Syntax Error: Invalid Date/Time value.\n");
gaprnt (0," Missing minute value \n");
return (NULL);
}
} else {
ch++;
if (*ch>='0' && *ch<='9') ch = intprs (ch,&val);
else val = def->dy;
}
} else flag = 2;
dtim->dy = val;
} else flag = 1;
monam[0] = *ch;
monam[1] = *(ch+1);
monam[2] = *(ch+2);
monam[3] = '\0';
i = 0;
while (i<12 && !cmpwrd(monam,mons[i]) ) i++;
i++;
if (i==13) {
if (flag==1) {
gaprnt (0,"Syntax Error: Invalid Date/Time value.\n");
gaprnt (0," Expected month abbreviation, none found\n");
return (NULL);
}
if (flag==2) {
gaprnt (0,"Syntax Error: Invalid Date/Time value.\n");
gaprnt (0," Missing month abbreviation or 'z' delimiter\n");
return (NULL);
}
dtim->mo = def->mo;
dtim->yr = def->yr;
} else {
dtim->mo = i;
ch+=3;
if (*ch>='0' && *ch<='9') ch = intprs (ch,&val);
else val = def->yr;
/*mf --- turn off setting of < 100 years to 1900 or 2000 ---mf*/
if(mfcmn.fullyear == 0) {
if (val<50) val+=2000;
else if (val<100) val+=1900;
}
dtim->yr = val;
}
i = mosiz[dtim->mo];
if (dtim->mo==2 && qleap(dtim->yr)) i = 29;
if (dtim->dy > i) {
gaprnt (0,"Syntax Error: Invalid Date/Time value.\n");
sprintf (pout," Day = %i -- greater than %i \n",dtim->dy,i);
gaprnt (0,pout);
return (NULL);
}
return (ch);
}
/* Parse a relative date/time (offset). Format is:
nn (yr/mo/dy/hr/mn)
Examples: 5mo
1dy12hr
etc.
Missing values are filled in with 0s. */
char *rdtprs (char *ch, struct dt *dtim) {
int flag,val;
char *pos;
char id[3];
pos = ch;
dtim->yr = 0;
dtim->mo = 0;
dtim->dy = 0;
dtim->hr = 0;
dtim->mn = 0;
flag = 1;
while (*ch>='0' && *ch<='9') {
flag = 0;
ch = intprs(ch,&val);
id[0] = *ch; id[1] = *(ch+1); id[2] = '\0';
if (cmpwrd("yr",id)) dtim->yr = val;
else if (cmpwrd("mo",id)) dtim->mo = val;
else if (cmpwrd("dy",id)) dtim->dy = val;
else if (cmpwrd("hr",id)) dtim->hr = val;
else if (cmpwrd("mn",id)) dtim->mn = val;
else {
gaprnt (0,"Syntax Error: Invalid Date/Time offset.\n");
sprintf (pout," Expecting yr/mo/dy/hr/mn, found %s\n",id);
gaprnt (0,pout);
return (NULL);
}
ch+=2;
}
if (flag) {
gaprnt (0,"Syntax Error: Invalid Date/Time offset.\n");
gaprnt (0," No offset value given\n");
return (NULL);
}
return (ch);
}
static char num[10]={'0','1','2','3','4','5','6','7','8','9'};
int gaedit (float val, char *chars, int icode) {
int i,j,k,sign;
char ch[20], *cc;
float vvv;
int w1,w2;
vvv=icode;
vvv=pow(10.0,vvv);
vvv=vvv*val;
sign=0;
if (vvv<0.0) {sign=1; vvv=vvv*(-1.0);}
i = 1;
ch[19] = '\0';
cc = &ch[18];
w2 = vvv+0.5;
while (w2>0) {
w1 = w2/10;
w1 = w1*10;
w1 = w2-w1;
*cc = num[w1];
cc--; i++;
icode--;
k=0;
if (icode==0) {
*cc='.';
cc--;
i++;
k=1;
}
w2 = w2/10;
}
if (k) {i++; *cc='0'; cc--;}
if (i==1) {i++; *cc='0';}
else {
if (sign) {*cc='-'; i++;}
else *cc++;
}
for (j=0;j<i;j++) {
*chars = *cc;
cc++; chars++;
}
return (i-1);
}
/* Compares two strings. A match occurs if the leading
blank-delimited words in the two strings match. CR and NULL also
serve as delimiters. */
int cmpwrd (char *ch1, char *ch2) {
while (*ch1==' '||*ch1=='\t') ch1++; /* Advance past leading blanks. */
while (*ch2==' '||*ch2=='\t') ch2++;
while (*ch1 == *ch2) {
if (*ch1==' '||*ch1=='\t'||*ch1=='\0'||*ch1=='\n' ) return (1);
ch1++; ch2++;
}
if ( (*ch1==' '||*ch1=='\t'||*ch1=='\0'||*ch1=='\n') &&
(*ch2==' '||*ch2=='\t'||*ch2=='\0'||*ch2=='\n') ) return (1);
return (0);
}
/* Moves a pointer to the start of the next blank-delimited word
in a string. If not found, NULL is returned. */
char * nxtwrd (char *ch) {
while (*ch!=' '&&*ch!='\t') { /* Skip 1st word */
if (*ch == '\0' || *ch == '\n') return (NULL);
ch++;
}
while (*ch==' '||*ch=='\t') ch++; /* Find next word */
if (*ch == '\0' || *ch == '\n') return (NULL);
return (ch);
}
/* Figures out how many digits are after the decimal point */
int gxdeci (float val) {
int code,ival;
code = 0;
val = fabs(val);
ival = val;
val = val - (float)ival;
while (code<4&&val>0.01) {
val=val*10.0;
ival=val;
val=val-(float)ival;
code++;
}
return (code);
}
/* Linear conversion routine for dimension conversions. */
float liconv (float *vals, float v) {
return ( (*vals * v) + *(vals+1) );
}
/* Non-linear scaling routine for discrete levels. Linear interp
between levels. Scaling beyond upper and lower bounds is
linear based on the last and first grid spacing, respectively.
In each case a pointer to a list of values is provided. The
list contains in its first element the number of values
in the list. */
/* Convert a grid value to a world coordinate value.
This operation needs to be efficient, since it gets done
very often. */
float gr2lev (float *vals, float gr) {
int i;
float x;
if (gr<1.0) return ( *(vals+1) + (1.0-gr)*(*(vals+1)-*(vals+2)) );
if (gr>*vals) {
i = (int)(*vals+0.1);
return ( *(vals+i) + (gr-*vals)*(*(vals+i)-*(vals+i-1)) );
}
i = (int)gr;
return (*(vals+i)+((gr-(float)i)*(*(vals+i+1)-*(vals+i))));
}
/* Convert from world coordinate value to grid value. This operation
is not set up to be efficient, under the assumption that it won't
get done all that often. */
float lev2gr (float *vals, float lev) {
int i,num;
float gr;
num = (int)(*vals+0.1);
for (i=1; i<num; i++) {
if ( (lev >= *(vals+i) && lev <= *(vals+i+1)) ||
(lev <= *(vals+i) && lev >= *(vals+i+1)) ) {
gr = (float)i + (lev - *(vals+i))/(*(vals+i+1) - *(vals+i));
return (gr);
}
}
if (*(vals+1)<*(vals+num)) {
if (lev<*(vals+1)) {
gr = 1.0 + ((lev-*(vals+1))/(*(vals+2)-*(vals+1)));
return (gr);
}
gr = (float)i + ((lev-*(vals+i))/(*(vals+i)-*(vals+i-1)));
return (gr);
} else {
if (lev>*(vals+1)) {
gr = 1.0 + ((lev-*(vals+1))/(*(vals+2)-*(vals+1)));
return (gr);
}
gr = (float)i + ((lev-*(vals+i))/(*(vals+i)-*(vals+i-1)));
return (gr);
}
}
/* Parses a number in a character string.
This routine will detect numbers of the form:
nnnn
-nnnn
Args: ch - pointer to the number, in character form.
val - integer value returned
return value - address of 1st character past the
number parsed. NULL if no number found
at pointer ch or if the number is an
invalid format.
*/
char *intprs (char *ch, int *val) {
int nflag,flag;
nflag = 0;
if (*ch=='-') { nflag = 1; ch++; }
else if (*ch=='+') ch++;
*val = 0;
flag = 1;
while (*ch>='0' && *ch<='9') {
*val = *val*10 + (int)(*ch-'0');
flag = 0;
ch++;
}
if (flag) return (NULL);
if (nflag) *val = -1 * *val;
return (ch);
}
/* Parses a number in a character string.
This routine will detect numbers of the form:
nnnn
nnnn.fff
nnnn.fffExxx
Args: ch - pointer to the number, in character form.
val - floating point value returned
return value - address of 1st character past the
number parsed. NULL if no number found
at pointer ch or if the number is an
invalid format.
*/
char *valprs (char *ch, float *val) {
int nflag,dflag,eflag,enflag,flag,cont;
int pflag,epflag,evflag;
float exp,dfp;
int zip;
flag=0;
nflag=0;dflag=0;eflag=0;enflag=0;
pflag=0;epflag=0;evflag=0;
*val=0.0;exp=0.0;dfp=0.1;
zip='0';
cont=1;
while (cont) {
if (*ch>='0' && *ch<='9') {
if (!flag) flag=1;
if (eflag) {evflag=1; exp=(exp*10)+(*ch-zip);}
else if (dflag) { *val = *val+((*ch-zip)*dfp); dfp=dfp/10.0; }
else *val = (*val*10.0)+(*ch-zip);
} else if (*ch=='-') {
if (eflag&&!evflag) {
if (enflag) {cont=0; flag=0;}
enflag=1;
}
else if (!flag) {
if (nflag) {cont=0; flag=0;}
nflag=1;
} else cont=0;
} else if (*ch=='+') {
if (eflag&&!evflag) {
if (epflag) {cont=0; flag=0;}
epflag=1;
}
else if (!flag) {
if (pflag) {cont=0; flag=0;}
pflag=1;
} else cont=0;
} else if (*ch=='.') {
if (dflag||eflag) {cont=0;}
else dflag=1;
} else if (*ch=='e') {
if (eflag) {
cont=0;
if (!evflag) flag=0;
}
else if (flag) {eflag=1; dflag=0;}
else cont=0;
} else cont=0;
if (cont) ch++;
}
if (flag) {
if (nflag) *val = *val*(-1.0);
if (eflag) {
if (enflag) exp = exp*(-1.0);
*val = *val*(pow(10.0,exp));
}
return (ch);
} else return (NULL);
}
/* dimprs parses a dimension 'expression', ie, where the user
specifies an absolute or relative dimension value.
The format is:
dim op val
where: dim = x,y,z,t,lat,lon,lev,time
op = +, -, or =
val = dimension value
Examples are:
t=1
lev=500
time=00:00z01jan1989
The coordinates are evaluated with respect to the coordinate
transformations of the file descriptor passed. Grid
coordinates are returned. Relative offsets are evaluated
from the values in the status block.
In addition, r=radius is also supported. The dimension value
returned is the radius, and the dimension number returned
is 9. This is only valid for stn type files.
wflag is set to zero if the dimension expression was
grid coordinates; 1 if it was world coordinates.
*/
char *dimprs (char *ch, struct gastat *pst, struct gafile *pfi,
int *dim, float *d, int type, int *wflag) {
char *pos, cc, cc2, cd, *frst;
char name[5];
int dval, flag,i,op;
struct dt dtim;
float (*conv) (float *, float);
float *cvals,v;
frst = ch;
i = 0;
while (*ch>='a' && *ch<='z' && i<6) {
name[i] = *ch;
ch++; i++;
}
name[i] = '\0';
if (i>4) {
gaprnt (0,"Syntax Error: Invalid dimension expression\n");
sprintf (pout," Expecting X/Y/Z/T/LAT/LON/LEV/TIME, found %s\n",
name);
gaprnt (0,pout);
return (NULL);
}
if (*ch == '=') op = 0;
else if (*ch == '+') op = 1;
else if (*ch == '-') op = 2;
else {
gaprnt (0,"Syntax Error: Invalid dimension expression\n");
sprintf (pout," Expecting +/-/= operator, found %c\n",*ch);
gaprnt (0,pout);
return (NULL);
}
ch++;
if (cmpwrd("time",name)) {
if (op==0) {
if ( (pos=adtprs(ch,&(pst->tmin),&dtim)) == NULL ) {
gaprnt (0," Invalid dimension expression\n");
return (NULL);
}
} else {
if ( (pos=rdtprs(ch,&dtim)) == NULL ) {
return (NULL);
}
}
} else {
if ( (pos=valprs(ch,&v)) == NULL ) {
gaprnt (0,"Syntax Error: Invalid dimension expression\n");
gaprnt (0," Dimension value missing or invalid\n");
return (NULL);
}
}
ch = pos;
/* We now have all the info we need about this dimension
expression. We can now evaluate it. */
if (cmpwrd("x",name)) *dim = 0;
else if (cmpwrd("y",name)) *dim = 1;
else if (cmpwrd("z",name)) *dim = 2;
else if (cmpwrd("t",name)) *dim = 3;
else if (cmpwrd("lon",name)) *dim = 4;
else if (cmpwrd("lat",name)) *dim = 5;
else if (cmpwrd("lev",name)) *dim = 6;
else if (cmpwrd("time",name)) *dim = 7;
else if (type==0 && cmpwrd("r",name)) *dim = 9;
else {
gaprnt (0,"Syntax Error: Invalid dimension expression\n");
sprintf (pout," Expecting X/Y/Z/T/LAT/LON/LEV/TIME, found %s\n",
name);
gaprnt (0,pout);
return (NULL);
}
*wflag = 0;
if (*dim == 9) {
*d = v;
return (ch);
}
if (*dim < 4) {
if (op==0) {
*d = v + pfi->dimoff[*dim];
return (ch);
} else {
if (*dim==pst->idim || *dim==pst->jdim) {
gaprnt (0,"Syntax Error: Invalid dimension expression\n");
gaprnt (0," Cannot use an offset value with a varying ");
gaprnt (0,"dimension\n");
sprintf (pout," Varying dimension = %i \n",*dim);
gaprnt (0,pout);
return (NULL);
}
if (*dim < 3) {
if (pfi->type==1) {
conv = pfi->ab2gr[*dim];
cvals = pfi->abvals[*dim];
*d = conv(cvals,pst->dmin[*dim]);
} else {
*d = pst->dmin[*dim];
}
} else {
*d = t2gr(pfi->abvals[3],&(pst->tmin));
}
if (op==1) *d = *d + v;
if (op==2) *d = *d - v;
return (ch);
}
} else {
*dim = *dim - 4;
*wflag = 1;
if (op>0) {
if (*dim==pst->idim || *dim==pst->jdim) {
gaprnt (0,"Syntax Error: Invalid dimension expression\n");
gaprnt (0," Cannot use an offset value with a varying ");
gaprnt (0,"dimension\n");
sprintf (pout," Varying dimension = %i \n",*dim);
gaprnt (0,pout);
return (NULL);
}
if (*dim==3) {
if (op==1) timadd (&(pst->tmin),&dtim);
if (op==2) timsub (&(pst->tmin),&dtim);
} else {
if (op==1) v = pst->dmin[*dim] + v;
if (op==2) v = pst->dmin[*dim] - v;
}
}
if (*dim < 3) {
if (pfi->type==1 || pfi->type==4) {
conv = pfi->ab2gr[*dim];
cvals = pfi->abvals[*dim];
*d = conv(cvals,v);
} else {
*d = v;
}
} else {
*d = t2gr(pfi->abvals[3],&dtim);
}
return (ch);
}
}
/*mf version
convert all upper case alphabetic characters to lower case.
The GrADS system is case insensitive, and assumes lower case
internally in most cases. */