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Unified Diff: fusl/src/stdio/fgets.c

Issue 1573973002: Add a "fork" of musl as //fusl. (Closed) Base URL: https://github.com/domokit/mojo.git@master
Patch Set: Created 4 years, 11 months ago
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Index: fusl/src/stdio/fgets.c
diff --git a/fusl/src/stdio/fgets.c b/fusl/src/stdio/fgets.c
new file mode 100644
index 0000000000000000000000000000000000000000..d3f9819e82eec3a5707805d5ae5b661a78adec30
--- /dev/null
+++ b/fusl/src/stdio/fgets.c
@@ -0,0 +1,46 @@
+#include "stdio_impl.h"
+#include <string.h>
+
+#define MIN(a,b) ((a)<(b) ? (a) : (b))
+
+char *fgets(char *restrict s, int n, FILE *restrict f)
+{
+ char *p = s;
+ unsigned char *z;
+ size_t k;
+ int c;
+
+ FLOCK(f);
+
+ if (n--<=1) {
+ f->mode |= f->mode-1;
+ FUNLOCK(f);
+ if (n) return 0;
+ *s = 0;
+ return s;
+ }
+
+ while (n) {
+ 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 || !n) break;
+ if ((c = getc_unlocked(f)) < 0) {
+ if (p==s || !feof(f)) s = 0;
+ break;
+ }
+ n--;
+ if ((*p++ = c) == '\n') break;
+ }
+ if (s) *p = 0;
+
+ FUNLOCK(f);
+
+ return s;
+}
+
+weak_alias(fgets, fgets_unlocked);
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