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(wc): Eliminate fstat call -- using lseek is sufficient.

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Detect/handle case in which CURR position > EOF.
This commit is contained in:
Jim Meyering
1995-02-10 05:53:54 +00:00
parent 15d9f70d1a
commit a3d2e589ed
1 changed files with 6 additions and 5 deletions
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src/wc.c
+6 -5
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@@ -216,14 +216,15 @@ wc (fd, file)
if (print_chars && !print_words && !print_lines)
{
struct stat stats;
off_t current_pos, end_pos;
if (fstat (fd, &stats) == 0 && S_ISREG (stats.st_mode)
&& (current_pos = lseek (fd, (off_t)0, SEEK_CUR)) != -1
&& (end_pos = lseek (fd, (off_t)0, SEEK_END)) != -1)
if ((current_pos = lseek (fd, (off_t) 0, SEEK_CUR)) != -1
&& (end_pos = lseek (fd, (off_t) 0, SEEK_END)) != -1)
{
chars = end_pos - current_pos;
off_t diff;
/* Be careful here. The current position may actually be
beyond the end of the file. As in the example above. */
chars = (diff = end_pos - current_pos) < 0 ? 0 : diff;
}
else
{