TicketNo:DTS2020090109976

Description:fix vsnprintf

Team:OTHERS
Feature or Bugfix:Bugfix
Binary Source:NA
PrivateCode(Yes/No):No

Change-Id: Ibf9200940137b8ae67e01bcc1ec1f6492a286fe3
Reviewed-on: http://mgit-tm.rnd.huawei.com/10617507Reviewed-by: Nliulei 00510663 <lewis.liulei@huawei.com>
Tested-by: Npublic jenkins <public_jenkins@notesmail.huawei.com>
Reviewed-by: Nshenwei 00579521 <denny.shenwei@huawei.com>

kernel/src/stdio/__stdout_write.c

@@ -6,12 +6,6 @@ size_t __stdout_write(FILE *f, const unsigned char *buf, size_t len)
     struct winsize wsz;
     if (!(f->flags & F_SVB) && ioctl(f->fd, TIOCGWINSZ, &wsz)) {
         f->lbf = EOF;
-    } else {
-        f->lbf = '\n';
-        f->write = __stdio_write;
-        f->wpos = f->wbase = f->buf;
-        f->wend = f->buf + f->buf_size;
     }
-    if (len == -1) return 0;
     return __stdio_write(f, buf, len);
 }

kernel/src/stdio/fwrite.c

@@ -13,8 +13,6 @@ size_t __fwritex(const unsigned char *restrict s, size_t l, FILE *restrict f)
 
 	if (l > f->wend - f->wpos) return f->write(f, s, l);
 
-	if (f->lbf == EOF) f->write(f, s, -1);
-
 	if (f->lbf >= 0) {
 		/* Match /^(.*\n|)/ */
 		for (i=l; i && s[i-1] != '\n'; i--);

kernel/src/stdio/vfprintf.c

@@ -10,6 +10,7 @@
 #include <inttypes.h>
 #include <math.h>
 #include <float.h>
+#include <sys/ioctl.h>
 
 /* Some useful macros */
 
@@ -443,7 +444,14 @@ static int printf_core(FILE *f, const char *fmt, va_list *ap, union arg *nl_arg,
 	int t, pl;
 	wchar_t wc[2], *ws;
 	char mb[4];
+	struct winsize wsz;
 
+	if (f && (f->write == __stdout_write) && !ioctl(f->fd, TIOCGWINSZ, &wsz)) {
+		f->lbf = '\n';
+		f->write = __stdio_write;
+		f->wpos = f->wbase = f->buf;
+		f->wend = f->buf + f->buf_size;
+	}
 	for (;;) {
 		/* This error is only specified for snprintf, but since it's
 		 * unspecified for other forms, do the same. Stop immediately