| #include "stdio_impl.h" |
| |
| /* Some useful macros */ |
| |
| #define MAX(a,b) ((a)>(b) ? (a) : (b)) |
| #define MIN(a,b) ((a)<(b) ? (a) : (b)) |
| #define CONCAT2(x,y) x ## y |
| #define CONCAT(x,y) CONCAT2(x,y) |
| |
| /* Convenient bit representation for modifier flags, which all fall |
| * within 31 codepoints of the space character. */ |
| |
| #define ALT_FORM (1U<<'#'-' ') |
| #define ZERO_PAD (1U<<'0'-' ') |
| #define LEFT_ADJ (1U<<'-'-' ') |
| #define PAD_POS (1U<<' '-' ') |
| #define MARK_POS (1U<<'+'-' ') |
| #define GROUPED (1U<<'\''-' ') |
| |
| #define FLAGMASK (ALT_FORM|ZERO_PAD|LEFT_ADJ|PAD_POS|MARK_POS|GROUPED) |
| |
| #if UINT_MAX == ULONG_MAX |
| #define LONG_IS_INT |
| #endif |
| |
| #if SIZE_MAX != ULONG_MAX || UINTMAX_MAX != ULLONG_MAX |
| #define ODD_TYPES |
| #endif |
| |
| /* State machine to accept length modifiers + conversion specifiers. |
| * Result is 0 on failure, or an argument type to pop on success. */ |
| |
| enum { |
| BARE, LPRE, LLPRE, HPRE, HHPRE, BIGLPRE, |
| ZTPRE, JPRE, |
| STOP, |
| PTR, INT, UINT, ULLONG, |
| #ifndef LONG_IS_INT |
| LONG, ULONG, |
| #else |
| #define LONG INT |
| #define ULONG UINT |
| #endif |
| SHORT, USHORT, CHAR, UCHAR, |
| #ifdef ODD_TYPES |
| LLONG, SIZET, IMAX, UMAX, PDIFF, UIPTR, |
| #else |
| #define LLONG ULLONG |
| #define SIZET ULONG |
| #define IMAX LLONG |
| #define UMAX ULLONG |
| #define PDIFF LONG |
| #define UIPTR ULONG |
| #endif |
| DBL, LDBL, |
| NOARG, |
| MAXSTATE |
| }; |
| |
| #define S(x) [(x)-'A'] |
| |
| static const unsigned char states[]['z'-'A'+1] = { |
| { /* 0: bare types */ |
| S('d') = INT, S('i') = INT, |
| S('o') = UINT, S('u') = UINT, S('x') = UINT, S('X') = UINT, |
| S('e') = DBL, S('f') = DBL, S('g') = DBL, S('a') = DBL, |
| S('E') = DBL, S('F') = DBL, S('G') = DBL, S('A') = DBL, |
| S('c') = CHAR, S('C') = INT, |
| S('s') = PTR, S('S') = PTR, S('p') = UIPTR, S('n') = PTR, |
| S('m') = NOARG, |
| S('l') = LPRE, S('h') = HPRE, S('L') = BIGLPRE, |
| S('z') = ZTPRE, S('j') = JPRE, S('t') = ZTPRE, |
| }, { /* 1: l-prefixed */ |
| S('d') = LONG, S('i') = LONG, |
| S('o') = ULONG, S('u') = ULONG, S('x') = ULONG, S('X') = ULONG, |
| S('c') = INT, S('s') = PTR, S('n') = PTR, |
| S('l') = LLPRE, |
| }, { /* 2: ll-prefixed */ |
| S('d') = LLONG, S('i') = LLONG, |
| S('o') = ULLONG, S('u') = ULLONG, |
| S('x') = ULLONG, S('X') = ULLONG, |
| S('n') = PTR, |
| }, { /* 3: h-prefixed */ |
| S('d') = SHORT, S('i') = SHORT, |
| S('o') = USHORT, S('u') = USHORT, |
| S('x') = USHORT, S('X') = USHORT, |
| S('n') = PTR, |
| S('h') = HHPRE, |
| }, { /* 4: hh-prefixed */ |
| S('d') = CHAR, S('i') = CHAR, |
| S('o') = UCHAR, S('u') = UCHAR, |
| S('x') = UCHAR, S('X') = UCHAR, |
| S('n') = PTR, |
| }, { /* 5: L-prefixed */ |
| S('e') = LDBL, S('f') = LDBL, S('g') = LDBL, S('a') = LDBL, |
| S('E') = LDBL, S('F') = LDBL, S('G') = LDBL, S('A') = LDBL, |
| S('n') = PTR, |
| }, { /* 6: z- or t-prefixed (assumed to be same size) */ |
| S('d') = PDIFF, S('i') = PDIFF, |
| S('o') = SIZET, S('u') = SIZET, |
| S('x') = SIZET, S('X') = SIZET, |
| S('n') = PTR, |
| }, { /* 7: j-prefixed */ |
| S('d') = IMAX, S('i') = IMAX, |
| S('o') = UMAX, S('u') = UMAX, |
| S('x') = UMAX, S('X') = UMAX, |
| S('n') = PTR, |
| } |
| }; |
| |
| #define OOB(x) ((unsigned)(x)-'A' > 'z'-'A') |
| |
| union arg |
| { |
| uintmax_t i; |
| long double f; |
| void *p; |
| }; |
| |
| static void pop_arg(union arg *arg, int type, va_list *ap) |
| { |
| /* Give the compiler a hint for optimizing the switch. */ |
| if ((unsigned)type > MAXSTATE) return; |
| switch (type) { |
| case PTR: arg->p = va_arg(*ap, void *); |
| break; case INT: arg->i = va_arg(*ap, int); |
| break; case UINT: arg->i = va_arg(*ap, unsigned int); |
| #ifndef LONG_IS_INT |
| break; case LONG: arg->i = va_arg(*ap, long); |
| break; case ULONG: arg->i = va_arg(*ap, unsigned long); |
| #endif |
| break; case ULLONG: arg->i = va_arg(*ap, unsigned long long); |
| break; case SHORT: arg->i = (short)va_arg(*ap, int); |
| break; case USHORT: arg->i = (unsigned short)va_arg(*ap, int); |
| break; case CHAR: arg->i = (signed char)va_arg(*ap, int); |
| break; case UCHAR: arg->i = (unsigned char)va_arg(*ap, int); |
| #ifdef ODD_TYPES |
| break; case LLONG: arg->i = va_arg(*ap, long long); |
| break; case SIZET: arg->i = va_arg(*ap, size_t); |
| break; case IMAX: arg->i = va_arg(*ap, intmax_t); |
| break; case UMAX: arg->i = va_arg(*ap, uintmax_t); |
| break; case PDIFF: arg->i = va_arg(*ap, ptrdiff_t); |
| break; case UIPTR: arg->i = (uintptr_t)va_arg(*ap, void *); |
| #endif |
| break; case DBL: arg->f = va_arg(*ap, double); |
| break; case LDBL: arg->f = va_arg(*ap, long double); |
| } |
| } |
| |
| static void out(FILE *f, const char *s, size_t l) |
| { |
| __fwritex((void *)s, l, f); |
| } |
| |
| static void pad(FILE *f, char c, int w, int l, int fl) |
| { |
| char pad[256]; |
| if (fl & (LEFT_ADJ | ZERO_PAD) || l >= w) return; |
| l = w - l; |
| memset(pad, c, l>sizeof pad ? sizeof pad : l); |
| for (; l >= sizeof pad; l -= sizeof pad) |
| out(f, pad, sizeof pad); |
| out(f, pad, l); |
| } |
| |
| static const char xdigits[16] = { |
| "0123456789ABCDEF" |
| }; |
| |
| static char *fmt_x(uintmax_t x, char *s, int lower) |
| { |
| for (; x; x>>=4) *--s = xdigits[(x&15)]|lower; |
| return s; |
| } |
| |
| static char *fmt_o(uintmax_t x, char *s) |
| { |
| for (; x; x>>=3) *--s = '0' + (x&7); |
| return s; |
| } |
| |
| static char *fmt_u(uintmax_t x, char *s) |
| { |
| unsigned long y; |
| for ( ; x>ULONG_MAX; x/=10) *--s = '0' + x%10; |
| for (y=x; y; y/=10) *--s = '0' + y%10; |
| return s; |
| } |
| |
| static int fmt_fp(FILE *f, long double y, int w, int p, int fl, int t) |
| { |
| uint32_t big[(LDBL_MAX_EXP+LDBL_MANT_DIG)/9+1]; |
| uint32_t *a, *d, *r, *z; |
| int e2=0, e, i, j, l; |
| char buf[9+LDBL_MANT_DIG/4], *s; |
| const char *prefix="-0X+0X 0X-0x+0x 0x"; |
| int pl; |
| char ebuf0[3*sizeof(int)], *ebuf=&ebuf0[3*sizeof(int)], *estr; |
| |
| pl=1; |
| if (y<0 || 1/y<0) { |
| y=-y; |
| } else if (fl & MARK_POS) { |
| prefix+=3; |
| } else if (fl & PAD_POS) { |
| prefix+=6; |
| } else prefix++, pl=0; |
| |
| if (!isfinite(y)) { |
| char *s = (t&32)?"inf":"INF"; |
| if (y!=y) s=(t&32)?"nan":"NAN", pl=0; |
| pad(f, ' ', w, 3+pl, fl&~ZERO_PAD); |
| out(f, prefix, pl); |
| out(f, s, 3); |
| pad(f, ' ', w, 3+pl, fl^LEFT_ADJ); |
| return MAX(w, 3+pl); |
| } |
| |
| y = frexpl(y, &e2) * 2; |
| if (y) e2--; |
| |
| if ((t|32)=='a') { |
| long double round = 8.0; |
| int re; |
| |
| if (t&32) prefix += 9; |
| pl += 2; |
| |
| if (p<0 || p>=LDBL_MANT_DIG/4-1) re=0; |
| else re=LDBL_MANT_DIG/4-1-p; |
| |
| if (re) { |
| while (re--) round*=16; |
| if (*prefix=='-') { |
| y=-y; |
| y-=round; |
| y+=round; |
| y=-y; |
| } else { |
| y+=round; |
| y-=round; |
| } |
| } |
| |
| estr=fmt_u(e2<0 ? -e2 : e2, ebuf); |
| if (estr==ebuf) *--estr='0'; |
| *--estr = (e2<0 ? '-' : '+'); |
| *--estr = t+('p'-'a'); |
| |
| s=buf; |
| do { |
| int x=y; |
| *s++=xdigits[x]|(t&32); |
| y=16*(y-x); |
| if (s-buf==1 && (y||p>0||(fl&ALT_FORM))) *s++='.'; |
| } while (y); |
| |
| if (p && s-buf-2 < p) |
| l = (p+2) + (ebuf-estr); |
| else |
| l = (s-buf) + (ebuf-estr); |
| |
| pad(f, ' ', w, pl+l, fl); |
| out(f, prefix, pl); |
| pad(f, '0', w, pl+l, fl^ZERO_PAD); |
| out(f, buf, s-buf); |
| pad(f, '0', l-(ebuf-estr)-(s-buf), 0, 0); |
| out(f, estr, ebuf-estr); |
| pad(f, ' ', w, pl+l, fl^LEFT_ADJ); |
| return MAX(w, pl+l); |
| } |
| if (p<0) p=6; |
| |
| if (y) y *= 0x1p28, e2-=28; |
| |
| if (e2<0) a=r=z=big; |
| else a=r=z=big+sizeof(big)/sizeof(*big) - LDBL_MANT_DIG - 1; |
| |
| do { |
| *z = y; |
| y = 1000000000*(y-*z++); |
| } while (y); |
| |
| while (e2>0) { |
| uint32_t carry=0; |
| int sh=MIN(29,e2); |
| for (d=z-1; d>=a; d--) { |
| uint64_t x = ((uint64_t)*d<<sh)+carry; |
| *d = x % 1000000000; |
| carry = x / 1000000000; |
| } |
| if (!z[-1] && z>a) z--; |
| if (carry) *--a = carry; |
| e2-=sh; |
| } |
| while (e2<0) { |
| uint32_t carry=0, *z2; |
| int sh=MIN(9,-e2); |
| for (d=a; d<z; d++) { |
| uint32_t rm = *d & (1<<sh)-1; |
| *d = (*d>>sh) + carry; |
| carry = (1000000000>>sh) * rm; |
| } |
| if (!*a) a++; |
| if (carry) *z++ = carry; |
| /* Avoid (slow!) computation past requested precision */ |
| z2 = ((t|32)=='f' ? r : a) + 2 + p/9; |
| z = MIN(z, z2); |
| e2+=sh; |
| } |
| |
| if (a<z) for (i=10, e=9*(r-a); *a>=i; i*=10, e++); |
| else e=0; |
| |
| /* Perform rounding: j is precision after the radix (possibly neg) */ |
| j = p - ((t|32)!='f')*e - ((t|32)=='g' && p); |
| if (j < 9*(z-r-1)) { |
| uint32_t x; |
| /* We avoid C's broken division of negative numbers */ |
| d = r + 1 + (j+9*LDBL_MAX_EXP)/9 - LDBL_MAX_EXP; |
| j += 9*LDBL_MAX_EXP; |
| j %= 9; |
| for (i=10, j++; j<9; i*=10, j++); |
| x = *d % i; |
| /* Are there any significant digits past j? */ |
| if (x || d+1!=z) { |
| long double round = CONCAT(0x1p,LDBL_MANT_DIG); |
| long double small; |
| if (x<i/2) small=0x01p-1; |
| else if (i==i/2 && d+1==z) small=0x10p-1; |
| else small=0x11p-1; |
| if (pl && *prefix=='-') round*=-1, small*=-1; |
| /* Decide whether to round by probing round+small */ |
| if (round+small != round) { |
| *d = *d - x + i; |
| while (*d > 999999999) { |
| *d--=0; |
| (*d)++; |
| } |
| if (d<a) a=d; |
| for (i=10, e=9*(r-a); *a>=i; i*=10, e++); |
| } |
| } |
| for (; !z[-1] && z>a; z--); |
| } |
| |
| if ((t|32)=='g') { |
| if (!p) p++; |
| if (p>e && e>=-4) { |
| t--; |
| p-=e+1; |
| } else { |
| t-=2; |
| p--; |
| } |
| if (!(fl&ALT_FORM)) { |
| /* Count trailing zeros in last place */ |
| if (z>a && z[-1]) for (i=10, j=0; z[-1]%i==0; i*=10, j++); |
| else j=9; |
| if ((t|32)=='f') |
| p = MIN(p,MAX(0,9*(z-r-1)-j)); |
| else |
| p = MIN(p,MAX(0,9*(z-r-1)+e-j)); |
| } |
| } |
| l = 1 + p + (p || (fl&ALT_FORM)); |
| if ((t|32)=='f') { |
| if (e>0) l+=e; |
| } else { |
| estr=fmt_u(e<0 ? -e : e, ebuf); |
| while(ebuf-estr<2) *--estr='0'; |
| *--estr = (e<0 ? '-' : '+'); |
| *--estr = t; |
| l += ebuf-estr; |
| } |
| |
| pad(f, ' ', w, pl+l, fl); |
| out(f, prefix, pl); |
| pad(f, '0', w, pl+l, fl^ZERO_PAD); |
| |
| if ((t|32)=='f') { |
| if (a>r) a=r; |
| for (d=a; d<=r; d++) { |
| char *s = fmt_u(*d, buf+9); |
| if (d!=a) while (s>buf) *--s='0'; |
| else if (s==buf+9) *--s='0'; |
| out(f, s, buf+9-s); |
| } |
| if (p || (fl&ALT_FORM)) out(f, ".", 1); |
| for (; d<z && p>0; d++, p-=9) { |
| char *s = fmt_u(*d, buf+9); |
| while (s>buf) *--s='0'; |
| out(f, s, MIN(9,p)); |
| } |
| pad(f, '0', p+9, 9, 0); |
| } else { |
| if (z<=a) z=a+1; |
| for (d=a; d<z && p>=0; d++) { |
| char *s = fmt_u(*d, buf+9); |
| if (s==buf+9) *--s='0'; |
| if (d!=a) while (s>buf) *--s='0'; |
| else { |
| out(f, s++, 1); |
| if (p>0||(fl&ALT_FORM)) out(f, ".", 1); |
| } |
| out(f, s, MIN(buf+9-s, p)); |
| p -= buf+9-s; |
| } |
| pad(f, '0', p+18, 18, 0); |
| out(f, estr, ebuf-estr); |
| } |
| |
| pad(f, ' ', w, pl+l, fl^LEFT_ADJ); |
| |
| return MAX(w, pl+l); |
| } |
| |
| static int getint(char **s) { |
| int i; |
| for (i=0; isdigit(**s); (*s)++) |
| i = 10*i + (**s-'0'); |
| return i; |
| } |
| |
| static int printf_core(FILE *f, const char *fmt, va_list *ap, union arg *nl_arg, int *nl_type) |
| { |
| char *a, *z, *s=(char *)fmt; |
| unsigned l10n=0, litpct, fl; |
| int w, p; |
| union arg arg; |
| int argpos; |
| unsigned st, ps; |
| int cnt=0, l=0; |
| int i; |
| char buf[sizeof(uintmax_t)*3+3+LDBL_MANT_DIG/4]; |
| const char *prefix; |
| int t, pl; |
| wchar_t wc[2], *ws; |
| char mb[4]; |
| |
| for (;;) { |
| /* Update output count, end loop when fmt is exhausted */ |
| if (cnt >= 0) { |
| if (l > INT_MAX - cnt) { |
| errno = EOVERFLOW; |
| cnt = -1; |
| } else cnt += l; |
| } |
| if (!*s) break; |
| |
| /* Handle literal text and %% format specifiers */ |
| for (a=s; *s && *s!='%'; s++); |
| litpct = strspn(s, "%")/2; /* Optimize %%%% runs */ |
| z = s+litpct; |
| s += 2*litpct; |
| l = z-a; |
| if (f) out(f, a, l); |
| if (l) continue; |
| |
| if (isdigit(s[1]) && s[2]=='$') { |
| l10n=1; |
| argpos = s[1]-'0'; |
| s+=3; |
| } else { |
| argpos = -1; |
| s++; |
| } |
| |
| /* Read modifier flags */ |
| for (fl=0; (unsigned)*s-' '<32 && (FLAGMASK&(1U<<*s-' ')); s++) |
| fl |= 1U<<*s-' '; |
| |
| /* Read field width */ |
| if (*s=='*') { |
| if (isdigit(s[1]) && s[2]=='$') { |
| l10n=1; |
| nl_type[s[1]-'0'] = INT; |
| w = nl_arg[s[1]-'0'].i; |
| s+=3; |
| } else if (!l10n) { |
| w = f ? va_arg(*ap, int) : 0; |
| s++; |
| } else return -1; |
| if (w<0) fl|=LEFT_ADJ, w=-w; |
| } else if ((w=getint(&s))<0) return -1; |
| |
| /* Read precision */ |
| if (*s=='.' && s[1]=='*') { |
| if (isdigit(s[2]) && s[3]=='$') { |
| nl_type[s[2]-'0'] = INT; |
| p = nl_arg[s[2]-'0'].i; |
| s+=4; |
| } else if (!l10n) { |
| p = f ? va_arg(*ap, int) : 0; |
| s+=2; |
| } else return -1; |
| } else if (*s=='.') { |
| s++; |
| p = getint(&s); |
| } else p = -1; |
| |
| /* Format specifier state machine */ |
| st=0; |
| do { |
| if (OOB(*s)) return -1; |
| ps=st; |
| st=states[st]S(*s++); |
| } while (st-1<STOP); |
| if (!st) return -1; |
| |
| /* Check validity of argument type (nl/normal) */ |
| if (st==NOARG) { |
| if (argpos>=0) return -1; |
| else if (!f) continue; |
| } else { |
| if (argpos>=0) nl_type[argpos]=st, arg=nl_arg[argpos]; |
| else if (f) pop_arg(&arg, st, ap); |
| else return 0; |
| } |
| |
| if (!f) continue; |
| |
| z = buf + sizeof(buf); |
| prefix = "-+ 0X0x"; |
| pl = 0; |
| t = s[-1]; |
| |
| /* Transform ls,lc -> S,C */ |
| if (ps && (t&15)==3) t&=~32; |
| |
| /* - and 0 flags are mutually exclusive */ |
| if (fl & LEFT_ADJ) fl &= ~ZERO_PAD; |
| |
| switch(t) { |
| case 'n': |
| switch(ps) { |
| case BARE: *(int *)arg.p = cnt; break; |
| case LPRE: *(long *)arg.p = cnt; break; |
| case LLPRE: *(long long *)arg.p = cnt; break; |
| case HPRE: *(unsigned short *)arg.p = cnt; break; |
| case HHPRE: *(unsigned char *)arg.p = cnt; break; |
| case ZTPRE: *(size_t *)arg.p = cnt; break; |
| case JPRE: *(uintmax_t *)arg.p = cnt; break; |
| } |
| continue; |
| case 'p': |
| p = MAX(p, 2*sizeof(void*)); |
| t = 'x'; |
| fl |= ALT_FORM; |
| case 'x': case 'X': |
| a = fmt_x(arg.i, z, t&32); |
| if (fl & ALT_FORM) prefix+=(t>>4), pl=2; |
| if (0) { |
| case 'o': |
| a = fmt_o(arg.i, z); |
| if ((fl&ALT_FORM) && arg.i) prefix+=5, pl=1; |
| } if (0) { |
| case 'd': case 'i': |
| pl=1; |
| if (arg.i>INTMAX_MAX) { |
| arg.i=-arg.i; |
| } else if (fl & MARK_POS) { |
| prefix++; |
| } else if (fl & PAD_POS) { |
| prefix+=2; |
| } else pl=0; |
| case 'u': |
| a = fmt_u(arg.i, z); |
| } |
| if (!arg.i && !p) continue; |
| if (p>=0) fl &= ~ZERO_PAD; |
| p = MAX(p, z-a + !arg.i); |
| break; |
| case 'c': |
| *(a=z-(p=1))=arg.i; |
| fl &= ~ZERO_PAD; |
| break; |
| case 'm': |
| if (1) a = strerror(errno); else |
| case 's': |
| a = arg.p; |
| z = memchr(a, 0, p); |
| if (!z) z=a+p; |
| else p=z-a; |
| fl &= ~ZERO_PAD; |
| break; |
| case 'C': |
| wc[0] = arg.i; |
| wc[1] = 0; |
| arg.p = wc; |
| p = -1; |
| case 'S': |
| ws = arg.p; |
| for (i=0; *ws && (l=wctomb(mb, *ws++))>=0 && l<=0U+p-i; i+=l); |
| if (l<0) return -1; |
| p = i; |
| pad(f, ' ', w, p, fl); |
| ws = arg.p; |
| for (i=0; *ws && i+(l=wctomb(mb, *ws++))<=p; i+=l) |
| out(f, mb, l); |
| pad(f, ' ', w, p, fl^LEFT_ADJ); |
| l = w>p ? w : p; |
| continue; |
| case 'e': case 'f': case 'g': case 'a': |
| case 'E': case 'F': case 'G': case 'A': |
| l = fmt_fp(f, arg.f, w, p, fl, t); |
| continue; |
| } |
| |
| if (p < z-a) p = z-a; |
| if (w < pl+p) w = pl+p; |
| |
| pad(f, ' ', w, pl+p, fl); |
| out(f, prefix, pl); |
| pad(f, '0', w, pl+p, fl^ZERO_PAD); |
| pad(f, '0', p, z-a, 0); |
| out(f, a, z-a); |
| pad(f, ' ', w, pl+p, fl^LEFT_ADJ); |
| |
| l = w; |
| } |
| |
| if (f) return cnt; |
| if (!l10n) return 0; |
| |
| for (i=1; i<=NL_ARGMAX && nl_type[i]; i++) |
| pop_arg(nl_arg+i, nl_type[i], ap); |
| for (; i<=NL_ARGMAX && !nl_type[i]; i++); |
| if (i<=NL_ARGMAX) return -1; |
| return 1; |
| } |
| |
| int vfprintf(FILE *f, const char *fmt, va_list ap) |
| { |
| va_list ap2; |
| int nl_type[NL_ARGMAX+1] = {0}; |
| union arg nl_arg[NL_ARGMAX+1]; |
| unsigned char internal_buf[80], *saved_buf = 0; |
| int ret; |
| |
| va_copy(ap2, ap); |
| if (printf_core(0, fmt, &ap2, nl_arg, nl_type) < 0) return -1; |
| |
| FLOCK(f); |
| if (!f->buf_size) { |
| saved_buf = f->buf; |
| f->buf = internal_buf; |
| f->buf_size = sizeof internal_buf; |
| } |
| ret = printf_core(f, fmt, &ap2, nl_arg, nl_type); |
| if (saved_buf) { |
| f->write(f, 0, 0); |
| if (!f->wpos) ret = -1; |
| f->buf = saved_buf; |
| f->buf_size = 0; |
| f->wpos = f->wbase = f->wend = 0; |
| } |
| FUNLOCK(f); |
| va_end(ap2); |
| return ret; |
| } |