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/*
* Scheme 9 from Empty Space, CSV Primitives
* By Nils M Holm, 2017
* Placed in the Public Domain
*
* Primitive functions for processing comma-separated values (CSVs)
*/
#include "s9core.h"
#include "s9import.h"
#include "s9ext.h"
#include <stdlib.h>
int grow(cell n, int i, int k, int kk) {
cell m;
if (i >= k) {
m = make_string("", k+kk);
memcpy(string(m), string(car(n)), k);
k += kk;
car(n) = m;
}
return k;
}
cell pp_csv_read(void) {
#define L 256
cell n, m;
int f = 0, i = 0, k = 0;
int c, nc;
int ne = 0;
c = readc();
if (EOF == c)
return END_OF_FILE;
n = cons(NIL, NIL);
save(n);
while (c != '\n') {
if ('"' == c) {
c = readc();
if (f && '"' == c) {
k = grow(n, i, k, L);
string(car(n))[i++] = c;
c = readc();
continue;
}
rejectc(c);
if (0 == f) {
f = 1;
ne++;
car(n) = make_string("", L);
k = L;
i = 0;
}
else {
f = 0;
m = make_string("", i);
memcpy(string(m), string(car(n)), i+1);
car(n) = m;
nc = 0;
while (' ' == (c = readc()) || ',' == c) {
if (',' == c && nc++ > 0) {
cdr(n) = cons(NIL, NIL);
n = cdr(n);
m = make_string("", 0);
car(n) = m;
}
}
if (c != '"')
break;
rejectc(c);
cdr(n) = cons(NIL, NIL);
n = cdr(n);
}
}
else if (f) {
k = grow(n, i, k, L);
string(car(n))[i++] = c;
}
c = readc();
}
while (c != '\n' && c != EOF)
c = readc();
if (0 == ne) {
unsave(1);
return NIL;
}
if (f) {
m = make_string("", i);
memcpy(string(m), string(car(n)), i+1);
car(n) = m;
}
return unsave(1);
}
cell pp_csv_write(void) {
cell p;
char *s, b[3];
b[2] = 0;
for (p = parg(1); p != NIL; p = cdr(p)) {
if (atom_p(p)) error("csv:write: improper list", parg(1));
prints("\"");
b[1] = 0;
for (s = string(car(p)); *s; s++) {
b[0] = *s;
b[1] = '"' == *s? '"': 0;
prints(b);
}
prints("\"");
if (pair_p(cdr(p)))
prints(",");
}
return UNSPECIFIC;
}
S9_PRIM Csv_primitives[] = {
{ "csv:read", pp_csv_read, 0, 0, { ___,___,___ } },
{ "csv:write", pp_csv_write, 1, 1, { LST,___,___ } },
{ NULL }
};
void csv_init(void) {
add_primitives("csv", Csv_primitives);
}
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