1#include "stdio_impl.h" 2#include <string.h> 3#ifndef __LITEOS__ 4#include "param_check.h" 5#endif 6 7#define MIN(a,b) ((a)<(b) ? (a) : (b)) 8char *fgets(char *restrict s, int n, FILE *restrict f) 9{ 10 char *p = s; 11 unsigned char *z; 12 size_t k; 13 int c; 14#ifndef __LITEOS__ 15 PARAM_CHECK(f); 16#endif 17 FLOCK(f); 18 19 if (n<=1) { 20 f->mode |= f->mode-1; 21 FUNLOCK(f); 22 if (n<1) return 0; 23 *s = 0; 24 return s; 25 } 26 n--; 27 28 while (n) { 29 if (f->rpos != f->rend) { 30 z = memchr(f->rpos, '\n', MIN(f->rend - f->rpos, n)); 31 k = z ? z - f->rpos + 1 : f->rend - f->rpos; 32 k = MIN(k, n); 33 memcpy(p, f->rpos, k); 34 f->rpos += k; 35 p += k; 36 n -= k; 37 if (z || !n) break; 38 } 39 if ((c = getc_unlocked(f)) < 0) { 40 if (p==s || !feof(f)) s = 0; 41 break; 42 } 43 n--; 44 if ((*p++ = c) == '\n') break; 45 } 46 if (s) *p = 0; 47 48 FUNLOCK(f); 49 50 return s; 51} 52 53 54weak_alias(fgets, fgets_unlocked); 55