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#include "stdio_impl.h" #define MIN(a,b) ((a)<(b) ? (a) : (b)) char *fgets(char *s, int n, FILE *f) { char *p = s; unsigned char *z; size_t k; if (!n--) return 0; FLOCK(f); while (n && !feof(f)) { 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) break; __underflow(f); } *p = 0; if (ferror(f)) p = s; FUNLOCK(f); return (p == s) ? 0 : s; } weak_alias(fgets, fgets_unlocked); |