/*
* We've kept track of how many lines were input and have those lines stored in
* a string array so to swap lines we just need to traverse the string array
* and call the swaplines method above
*/
void swaplineorder(char** l, int numLines){
char** r = l + numLines - 1;
while(l < r){
swaplines(l++,r--);
}
}
static void
join(FILE *fa, FILE *fb, size_t jfa, size_t jfb)
{
struct span spa, spb;
int cmp, eofa, eofb;
initspan(&spa);
initspan(&spb);
cmp = eofa = eofb = 0;
addtospan(&spa, fa, RESET);
addtospan(&spb, fb, RESET);
while (spa.nl && spb.nl) {
if ((cmp = linecmp(spa.lines[0], spb.lines[0], jfa, jfb)) < 0) {
if (unpairsa)
prline(spa.lines[0]);
if (!addtospan(&spa, fa, RESET)) {
if (unpairsb) { /* a is EOF'd; print the rest of b */
do
prline(spb.lines[0]);
while (addtospan(&spb, fb, RESET));
}
eofa = eofb = 1;
} else {
continue;
}
} else if (cmp > 0) {
if (unpairsb)
prline(spb.lines[0]);
if (!addtospan(&spb, fb, RESET)) {
if (unpairsa) { /* b is EOF'd; print the rest of a */
do
prline(spa.lines[0]);
while (addtospan(&spa, fa, RESET));
}
eofa = eofb = 1;
} else {
continue;
}
} else if (cmp == 0) {
/* read all consecutive matching lines from a */
do {
if (!addtospan(&spa, fa, EXPAND)) {
eofa = 1;
spa.nl++;
break;
}
} while (linecmp(spa.lines[spa.nl-1], spb.lines[0], jfa, jfb) == 0);
/* read all consecutive matching lines from b */
do {
if (!addtospan(&spb, fb, EXPAND)) {
eofb = 1;
spb.nl++;
break;
}
} while (linecmp(spa.lines[0], spb.lines[spb.nl-1], jfa, jfb) == 0);
if (pairs)
prspanjoin(&spa, &spb, jfa, jfb);
} else { /* FIELD_ERROR: both lines lacked join fields */
if (unpairsa)
prline(spa.lines[0]);
if (unpairsb)
prline(spb.lines[0]);
eofa = addtospan(&spa, fa, RESET) ? 0 : 1;
eofb = addtospan(&spb, fb, RESET) ? 0 : 1;
if (!eofa && !eofb)
continue;
}
if (eofa) {
spa.nl = 0;
} else {
swaplines(spa.lines[0], spa.lines[spa.nl - 1]); /* ugly */
spa.nl = 1;
}
if (eofb) {
spb.nl = 0;
} else {
swaplines(spb.lines[0], spb.lines[spb.nl - 1]); /* ugly */
spb.nl = 1;
}
}
freespan(&spa);
freespan(&spb);
}
