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Improve comment for first_same_file.

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This commit is contained in:
Paul Eggert
2004-07-30 23:24:03 +00:00
parent 55710cf6e1
commit 94732c8a71
1 changed files with 11 additions and 1 deletions
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src/sort.c
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@@ -1881,7 +1881,17 @@ sortlines_temp (struct line *lines, size_t nlines, struct line *temp)
}
/* Return the index of the first of NFILES FILES that is the same file
as OUTFILE. If none can be the same, return NFILES. */
as OUTFILE. If none can be the same, return NFILES.
This test ensures that an otherwise-erroneous use like
"sort -m -o FILE ... FILE ..." copies FILE before writing to it.
It's not clear that POSIX requires this nicety.
Detect common error cases, but don't try to catch obscure cases like
"cat ... FILE ... | sort -m -o FILE"
where traditional "sort" doesn't copy the input and where
people should know that they're getting into trouble anyway.
Catching these obscure cases would slow down performance in
common cases. */
static int
first_same_file (char * const *files, int nfiles, char const *outfile)