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#define _XOPEN_SOURCE 700
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "more.h"
ssize_t more_getline(struct more_file *mf, size_t lineno)
{
if (mf->nlines <= lineno && mf->nlines != 0) {
fsetpos(mf->f, &(mf->lines[mf->nlines - 1]));
getline(&(mf->buf), &(mf->nbuf), mf->f);
}
while (mf->nlines <= lineno) {
mf->nlines++;
mf->lines = realloc(mf->lines, mf->nlines * sizeof(*mf->lines));
fgetpos(mf->f, &(mf->lines[mf->nlines - 1]));
getline(&(mf->buf), &(mf->nbuf), mf->f);
if (mf->backing != mf->f) {
fgetpos(mf->backing, &(mf->lines[mf->nlines - 1]));
fputs(mf->buf, mf->backing);
}
}
fsetpos(mf->backing, &(mf->lines[lineno]));
return getline(&(mf->buf), &(mf->nbuf), mf->backing);
}
struct more_file more_open(const char *path)
{
struct more_file mf = {
.f = stdin,
};
if (strcmp(path, "-")) {
mf.f = fopen(path, "r");
if (!mf.f) {
fprintf(stderr, "more: %s: %s\n", path, strerror(errno));
return mf;
}
}
fpos_t pos;
if (fgetpos(mf.f, &pos) != 0) {
mf.backing = tmpfile();
} else {
mf.backing = mf.f;
}
return mf;
}
void more_close(struct more_file *mf)
{
if (mf->backing != mf->f) {
fclose(mf->backing);
}
if (mf->f != stdin) {
fclose(mf->f);
}
free(mf->lines);
free(mf->buf);
}
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