1#include "stdio_impl.h"
2#include <string.h>
3
4#define MIN(a,b) ((a)<(b) ? (a) : (b))
5
6char *fgets(char *restrict s, int n, FILE *restrict f)
7{
8	char *p = s;
9	unsigned char *z;
10	size_t k;
11	int c;
12
13	FLOCK(f);
14
15	if (n--<=1) {
16		f->mode |= f->mode-1;
17		FUNLOCK(f);
18		if (n) return 0;
19		*s = 0;
20		return s;
21	}
22
23	while (n) {
24		z = memchr(f->rpos, '\n', f->rend - f->rpos);
25		k = z ? z - f->rpos + 1 : f->rend - f->rpos;
26		k = MIN(k, n);
27		memcpy(p, f->rpos, k);
28		f->rpos += k;
29		p += k;
30		n -= k;
31		if (z || !n) break;
32		if ((c = getc_unlocked(f)) < 0) {
33			if (p==s || !feof(f)) s = 0;
34			break;
35		}
36		n--;
37		if ((*p++ = c) == '\n') break;
38	}
39	if (s) *p = 0;
40
41	FUNLOCK(f);
42
43	return s;
44}
45
46weak_alias(fgets, fgets_unlocked);
47