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in vswprintf, initialize the FILE rather than memset-and-assign 

this is the idiom that's used elsewhere and should be more efficient
or at least no worse.
This commit is contained in:
Rich Felker 2018-02-24 12:08:30 -05:00
parent aaa29c26ee
commit 7c59d09863
1 changed files with 8 additions and 9 deletions
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17
src/stdio/vswprintf.c
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@ -1,6 +1,5 @@
#include "stdio_impl.h"
#include <limits.h>
#include <string.h>
#include <errno.h>
#include <stdint.h>
#include <wchar.h>
@ -37,17 +36,17 @@ static size_t sw_write(FILE *f, const unsigned char *s, size_t l)
int vswprintf(wchar_t *restrict s, size_t n, const wchar_t *restrict fmt, va_list ap)
{
int r;
FILE f;
unsigned char buf[256];
struct cookie c = { s, n-1 };
FILE f = {
.lbf = EOF,
.write = sw_write,
.lock = -1,
.buf = buf,
.buf_size = sizeof buf,
.cookie = &c,
};
memset(&f, 0, sizeof(FILE));
f.lbf = EOF;
f.write = sw_write;
f.buf_size = sizeof buf;
f.buf = buf;
f.lock = -1;
f.cookie = &c;
if (!n) {
return -1;
} else if (n > INT_MAX) {