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ref: 5f464c4f5f082f5562a9ed1eb288366ef88147ea
parent: 5ab34fe6b03c4e0938f17fe445e96bc19bf76768
author: Hiltjo Posthuma <hiltjo@codemadness.org>
date: Thu May 19 15:02:38 EDT 2022

libc: don't set the error flag on string streams

This fixes the use-case:

	printf("%d\n", snprintf(NULL, 0, "abc"));

Printed -1, but should print 3.

--- a/src/libc/stdio/__putc.c

+++ b/src/libc/stdio/__putc.c

@@ -24,10 +24,8 @@

 		return EOF;

 	}

-	if (fp->flags & _IOSTRG) {

-		fp->flags |= _IOERR;

-		return EOF;

-	}

+	if (fp->flags & _IOSTRG)

+		return ch & 0xFF;

 	if (fp->buf == NULL && _allocbuf(fp))

 		return EOF;