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#include <stdbool.h>
#include <stdlib.h>
#include "io.h"
#include "navier-stokes.h"
// write final entry to file
int write_u(_Complex double* u, int K1, int K2, FILE* file){
int kx,ky;
// do nothing if there is no file
if(file==NULL){
return 0;
}
for(kx=0;kx<=K1;kx++){
for (ky=-K2;ky<=K2;ky++){
fprintf(file,"% 3d % 3d % .15e % .15e\n",kx,ky,__real__ u[klookup_sym(kx,ky,K2)],__imag__ u[klookup_sym(kx,ky,K2)]);
}
}
return 0;
}
// read u from file
int read_u(_Complex double* u, int K1, int K2, FILE* file){
int kx,ky;
double r,i;
char* line;
unsigned int len=256;
unsigned int pos=0;
char* line_realloc;
char c;
int ret;
unsigned int counter=0;
bool commented=false;
// error if there is no file (this should not happen)
if (file==NULL){
fprintf(stderr,"error reading u from file (this is a bug!)\n");
return -1;
}
// allocate line buffer
line=calloc(sizeof(char), len);
while(1){
c=fgetc(file);
// end of file
if (feof(file)){
break;
}
// newline: read line and reset buffer
if(c=='\n' || c=='\r'){
// increment line counter
counter++;
// read entry
// ignore empty lines
if(pos>0){
ret=sscanf(line, "%d %d %le %le", &kx, &ky, &r, &i);
// errors
if(ret!=4){
fprintf(stderr, "warning: line %d does not match the input format: '%s', skipping\n", counter, line);
}
else{
if(kx>K1 || kx<-K1 || ky>K2 || ky<-K2){
fprintf(stderr, "warning: reading line %d: kx or ky out of bounds: %d,%d, skipping\n", counter, kx, ky);
}
else if (kx<0){
fprintf(stderr, "warning: reading line %d: kx should be >=0, skipping\n", counter);
}
else{
// set u
u[klookup_sym(kx, ky, K2)]=r+i*I;
}
}
}
// reset buffer
pos=0;
line[pos]='\0';
commented=false;
}
// comment: stop reading
else if (c=='#'){
commented=true;
}
// add to buffer (unless we are in a comment)
else if (!(commented)){
// check that there is room in buffer
if(pos==len){
// too short: reallocate
line_realloc=calloc(sizeof(char), 2*len);
for(pos=0;pos<len;pos++){
line_realloc[pos]=line[pos];
}
free(line);
line=line_realloc;
len=2*len;
}
// add c to line
line[pos]=c;
pos++;
line[pos]='\0';
}
}
free(line);
return 0;
}
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