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comm: Print first trailing unpaired line in file 1 

Previously, a line read from file 1 before a strcmp was
performed would be overwritten and lost. Something like
this:

    comm one_line_file empty_file

produced no output.

This patch is a bit inelegant, but quite simple.
This commit is contained in:
Wolfgang Corcoran-Mathe 2015-08-03 15:30:35 -04:00 committed by sin
parent 5dc6f3c1e6
commit ac62259d24
1 changed files with 6 additions and 3 deletions
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9
comm.c
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@ -33,7 +33,7 @@ main(int argc, char *argv[])
{
FILE *fp[2];
size_t linelen[2] = { 0, 0 };
int ret = 0, i, diff = 0;
int ret = 0, i, diff = 0, seenline = 0;
char *line[2] = { NULL, NULL };
ARGBEGIN {
@ -62,11 +62,13 @@ main(int argc, char *argv[])
for (i = 0; i < 2; i++) {
if (diff && i == (diff < 0))
continue;
if (getline(&line[i], &linelen[i], fp[i]) > 0)
if (getline(&line[i], &linelen[i], fp[i]) > 0) {
seenline = 1;
continue;
}
if (ferror(fp[i]))
eprintf("getline %s:", argv[i]);
if (diff && line[!i][0])
if ((diff || seenline) && line[!i][0])
printline(!i, line[!i]);
while (getline(&line[!i], &linelen[!i], fp[!i]) > 0)
printline(!i, line[!i]);
@ -76,6 +78,7 @@ main(int argc, char *argv[])
}
diff = strcmp(line[0], line[1]);
LIMIT(diff, -1, 1);
seenline = 0;
printline((2 - diff) % 3, line[MAX(0, diff)]);
}
end: