initial check-in, version 0.5.0 v0.5.0

1 files changed, 34 insertions, 0 deletions

diff --git a/src/stdio/fgets.c b/src/stdio/fgets.c
new file mode 100644
index 00000000..7939303e
--- /dev/null
+++ b/src/stdio/fgets.c
@@ -0,0 +1,34 @@
+#include "stdio_impl.h"
+
+#define MIN(a,b) ((a)<(b) ? (a) : (b))
+
+char *fgets(char *s, int n, FILE *f)
+{
+	char *p = s;
+	unsigned char *z;
+	size_t k;
+
+	if (!n--) return 0;
+
+	FLOCK(f);
+
+	while (n && !feof(f)) {
+		z = memchr(f->rpos, '\n', f->rend - f->rpos);
+		k = z ? z - f->rpos + 1 : f->rend - f->rpos;
+		k = MIN(k, n);
+		memcpy(p, f->rpos, k);
+		f->rpos += k;
+		p += k;
+		n -= k;
+		if (z) break;
+		__underflow(f);
+	}
+	*p = 0;
+	if (ferror(f)) p = s;
+
+	FUNLOCK(f);
+
+	return (p == s) ? 0 : s;
+}
+
+weak_alias(fgets, fgets_unlocked);