1 files changed, 51 insertions, 0 deletions
diff --git a/src/stdio/fwrite.c b/src/stdio/fwrite.c
new file mode 100644
index 00000000..23974fe1
--- /dev/null
+++ b/src/stdio/fwrite.c
@@ -0,0 +1,51 @@
+#include "stdio_impl.h"
+
+size_t __fwritex(const unsigned char *s, size_t l, FILE *f)
+{
+	size_t i = 0;
+	size_t k = f->wend - f->wpos;
+
+	/* Handle line-buffered mode by breaking into 2 parts */
+	if (f->lbf >= 0) {
+		/* Match /^(.*\n|)/ */
+		for (i=l; i && s[i-1] != '\n'; i--);
+		if (i) {
+			f->lbf = EOF;
+			__fwritex(s, i, f);
+			f->lbf = '\n';
+			__oflow(f);
+			return ferror(f) ? 0 : i + __fwritex(s+i, l-i, f);
+		}
+	}
+
+	/* Buffer initial segment */
+	if (k > l) k = l;
+	memcpy(f->wpos, s, k);
+	f->wpos += k;
+	if (f->wpos < f->wend) return l;
+
+	/* If there's work left to do, flush buffer */
+	__oflow(f);
+	if (ferror(f)) return 0;
+
+	/* If the remainder will not fit in buffer, write it directly */
+	if (l - k >= f->wend - f->wpos)
+		return k + f->write(f, s+k, l-k);
+
+	/* Otherwise, buffer the remainder */
+	memcpy(f->wpos, s+k, l-k);
+	f->wpos += l-k;
+	return l;
+}
+
+size_t fwrite(const void *src, size_t size, size_t nmemb, FILE *f)
+{
+	size_t l = size*nmemb;
+	if (!l) return l;
+	FLOCK(f);
+	l = __fwritex(src, l, f);
+	FUNLOCK(f);
+	return l/size;
+}
+
+weak_alias(fwrite, fwrite_unlocked);