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#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include "doc.h"
#include "err.h"
/* initialization / destruction */
void doc_init(struct doc *d) {
buf_init(&d->txt, sizeof(struct doc_line));
buf_init(&d->lnk, 1);
d->txt.sz = sizeof(struct doc_line);
*(struct doc_line *)d->txt.buf = (struct doc_line) {
.prev = 0,
.link = DOC_LINK_NONE,
.len = 0,
};
d->latest = 0;
d->linkc = 0;
}
void doc_fini(struct doc *d) {
buf_free(&d->txt);
buf_free(&d->lnk);
}
/* line creation */
void doc_new_line(struct doc *d) {
buf_grow(&d->txt, sizeof(struct doc_line));
*(struct doc_line *)&d->txt.buf[d->txt.sz] = (struct doc_line) {
.prev = ((struct doc_line *)&d->txt.buf[d->latest])->len,
.link = DOC_LINK_NONE,
.len = 0
};
d->latest = d->txt.sz;
d->txt.sz += sizeof(struct doc_line);
}
void doc_add_line(struct doc *d, const char *s) {
doc_add_text(d, s);
doc_new_line(d);
}
void doc_add_text(struct doc *d, const char *s) {
doc_add_textn(d, s, strlen(s));
}
void doc_add_textn(struct doc *d, const char *s, size_t n) {
buf_grow(&d->txt, n);
memcpy(&d->txt.buf[d->txt.sz], s, n);
struct doc_line *dl = (struct doc_line *)&d->txt.buf[d->latest];
d->txt.sz += n;
dl->len += n;
}
unsigned short doc_add_link(struct doc *d, const char *url) {
buf_cat(&d->lnk, url, strlen(url) + 1);
return d->linkc++;
}
void doc_set_link(struct doc *d, unsigned short lnk) {
struct doc_line *l = doc_line_at(d, d->latest);
l->link = lnk;
}
/* line navigation */
struct doc_line *doc_line_at(struct doc *d, size_t ofs) {
return (struct doc_line *)&d->txt.buf[ofs];
}
int doc_line_prev(struct doc *d, size_t *ofs) {
size_t n = doc_line_at(d, *ofs)->prev + sizeof(struct doc_line);
if (*ofs >= n) {
*ofs -= n;
return 0;
} else {
return -1;
}
}
int doc_line_next(struct doc *d, size_t *ofs) {
size_t n = doc_line_at(d, *ofs)->len + sizeof(struct doc_line);
if (*ofs + n < d->txt.sz) {
*ofs += n;
return 0;
} else {
return -1;
}
}
const char *doc_get_link(struct doc *d, unsigned short lnk) {
size_t l = 1;
for (size_t i = 0; i < d->lnk.sz; i++) {
if (l == lnk) return &d->lnk.buf[i];
if (d->lnk.buf[i] == 0) l++;
}
return NULL;
}
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