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