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wc: Make the read buffer static.

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The read buffer in cnt() is 64 kB, which is a bit excessive for a stack variable.  MAXBSIZE has grown since this code was originally written, and it might grow again in the future.  Since the program is single-threaded and cnt() does not recurse, we can safely make the buffer static.

While there, constify p since it is only used to read.

Sponsored by:	Klara, Inc.
Reviewed by:	emaste
Differential Revision:	https://reviews.freebsd.org/D38608
This commit is contained in:
Dag-Erling Smørgrav 2023-02-16 00:40:30 +00:00
parent 5c870e1b48
commit 5016d112ad
1 changed files with 3 additions and 2 deletions
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5
usr.bin/wc/wc.c
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@ -214,9 +214,10 @@ show_cnt(const char *file, uintmax_t linect, uintmax_t wordct,
static int
cnt(const char *file)
{
char buf[MAXBSIZE], *p;
static char buf[MAXBSIZE];
struct stat sb;
mbstate_t mbs;
const char *p;
uintmax_t linect, wordct, charct, llct, tmpll;
ssize_t len;
size_t clen;
@ -259,7 +260,7 @@ cnt(const char *file)
* lines than to get words, since the word count requires locale
* handling.
*/
while ((len = read(fd, buf, sizeof(buf)))) {
while ((len = read(fd, buf, sizeof(buf))) != 0) {
if (len < 0) {
xo_warn("%s: read", file);
(void)close(fd);