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#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) { if (f->rpos != f->rend) { 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); |