/* $NetBSD: vfprintf.c,v 1.35 2000/12/30 04:13:25 itojun Exp $ */ /*- * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * Chris Torek. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include #if defined(LIBC_SCCS) && !defined(lint) #if 0 static char *sccsid = "@(#)vfprintf.c 5.50 (Berkeley) 12/16/92"; #else __RCSID("$NetBSD: vfprintf.c,v 1.35 2000/12/30 04:13:25 itojun Exp $"); #endif #endif /* LIBC_SCCS and not lint */ /* * Actual printf innards. * * This code is large and complicated... */ #include "namespace.h" #include #include #include #include #include #include #include #if __STDC__ #include #else #include #endif #include "local.h" #include "fvwrite.h" #include "extern.h" #include "reentrant.h" static int __sprint __P((FILE *, struct __suio *)); static int __sbprintf __P((FILE *, const char *, va_list)) __attribute__((__format__(__printf__, 2, 0))); /* * Flush out all the vectors defined by the given uio, * then reset it so that it can be reused. */ static int __sprint(fp, uio) FILE *fp; struct __suio *uio; { int err; _DIAGASSERT(fp != NULL); _DIAGASSERT(uio != NULL); if (uio->uio_resid == 0) { uio->uio_iovcnt = 0; return (0); } err = __sfvwrite(fp, uio); uio->uio_resid = 0; uio->uio_iovcnt = 0; return (err); } /* * Helper function for `fprintf to unbuffered unix file': creates a * temporary buffer. We only work on write-only files; this avoids * worries about ungetc buffers and so forth. */ static int __sbprintf(fp, fmt, ap) FILE *fp; const char *fmt; va_list ap; { int ret; FILE fake; unsigned char buf[BUFSIZ]; _DIAGASSERT(fp != NULL); _DIAGASSERT(fmt != NULL); /* copy the important variables */ fake._flags = fp->_flags & ~__SNBF; fake._file = fp->_file; fake._cookie = fp->_cookie; fake._write = fp->_write; /* set up the buffer */ fake._bf._base = fake._p = buf; fake._bf._size = fake._w = sizeof(buf); fake._lbfsize = 0; /* not actually used, but Just In Case */ /* do the work, then copy any error status */ ret = vfprintf(&fake, fmt, ap); if (ret >= 0 && fflush(&fake)) ret = -1; if (fake._flags & __SERR) fp->_flags |= __SERR; return (ret); } #ifdef FLOATING_POINT #include #include #include "floatio.h" #define BUF (MAXEXP+MAXFRACT+1) /* + decimal point */ #define DEFPREC 6 static char *cvt __P((double, int, int, char *, int *, int, int *)); static int exponent __P((char *, int, int)); #else /* no FLOATING_POINT */ #define BUF 40 #endif /* FLOATING_POINT */ #ifdef lint static __inline void *__UNCONST __P((const void *)); static __inline void * __UNCONST(v) const void *v; { /* LINTED */ return (void *) v; } #else #define __UNCONST(v) (void *)(v) #endif /* * Macros for converting digits to letters and vice versa */ #define to_digit(c) ((c) - '0') #define is_digit(c) ((unsigned)to_digit(c) <= 9) #define to_char(n) ((char)((n) + '0')) /* * Flags used during conversion. */ #define ALT 0x001 /* alternate form */ #define HEXPREFIX 0x002 /* add 0x or 0X prefix */ #define LADJUST 0x004 /* left adjustment */ #define LONGDBL 0x008 /* long double; unimplemented */ #define LONGINT 0x010 /* long integer */ #define QUADINT 0x020 /* quad integer */ #define SHORTINT 0x040 /* short integer */ #define ZEROPAD 0x080 /* zero (as opposed to blank) pad */ #define FPT 0x100 /* Floating point number */ int vfprintf(fp, fmt0, ap) FILE *fp; const char *fmt0; _BSD_VA_LIST_ ap; { const char *fmt;/* format string */ int ch; /* character from fmt */ int n, m; /* handy integers (short term usage) */ const char *cp; /* handy char pointer (short term usage) */ char *bp; /* handy char pointer (short term usage) */ struct __siov *iovp;/* for PRINT macro */ int flags; /* flags as above */ int ret; /* return value accumulator */ int width; /* width from format (%8d), or 0 */ int prec; /* precision from format (%.3d), or -1 */ char sign; /* sign prefix (' ', '+', '-', or \0) */ wchar_t wc; mbstate_t ps; #ifdef FLOATING_POINT char *decimal_point = localeconv()->decimal_point; char softsign; /* temporary negative sign for floats */ double _double = 0; /* double precision arguments %[eEfgG] */ int expt; /* integer value of exponent */ int expsize = 0; /* character count for expstr */ int ndig; /* actual number of digits returned by cvt */ char expstr[7]; /* buffer for exponent string */ #endif #ifdef __GNUC__ /* gcc has builtin quad type (long long) SOS */ #define quad_t long long #define u_quad_t unsigned long long #endif u_quad_t _uquad; /* integer arguments %[diouxX] */ enum { OCT, DEC, HEX } base;/* base for [diouxX] conversion */ int dprec; /* a copy of prec if [diouxX], 0 otherwise */ int realsz; /* field size expanded by dprec */ int size; /* size of converted field or string */ char *xdigs = NULL; /* digits for [xX] conversion */ #define NIOV 8 struct __suio uio; /* output information: summary */ struct __siov iov[NIOV];/* ... and individual io vectors */ char buf[BUF]; /* space for %c, %[diouxX], %[eEfgG] */ char ox[2]; /* space for 0x hex-prefix */ /* * Choose PADSIZE to trade efficiency vs. size. If larger printf * fields occur frequently, increase PADSIZE and make the initialisers * below longer. */ #define PADSIZE 16 /* pad chunk size */ static const char blanks[PADSIZE] = {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '}; static const char zeroes[PADSIZE] = {'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'}; /* * BEWARE, these `goto error' on error, and PAD uses `n'. */ #define PRINT(ptr, len) { \ iovp->iov_base = __UNCONST(ptr); \ iovp->iov_len = (len); \ uio.uio_resid += (len); \ iovp++; \ if (++uio.uio_iovcnt >= NIOV) { \ if (__sprint(fp, &uio)) \ goto error; \ iovp = iov; \ } \ } #define PAD(howmany, with) { \ if ((n = (howmany)) > 0) { \ while (n > PADSIZE) { \ PRINT(with, PADSIZE); \ n -= PADSIZE; \ } \ PRINT(with, n); \ } \ } #define FLUSH() { \ if (uio.uio_resid && __sprint(fp, &uio)) \ goto error; \ uio.uio_iovcnt = 0; \ iovp = iov; \ } /* * To extend shorts properly, we need both signed and unsigned * argument extraction methods. */ #define SARG() \ (flags&QUADINT ? va_arg(ap, quad_t) : \ flags&LONGINT ? va_arg(ap, long) : \ flags&SHORTINT ? (long)(short)va_arg(ap, int) : \ (long)va_arg(ap, int)) #define UARG() \ (flags&QUADINT ? va_arg(ap, u_quad_t) : \ flags&LONGINT ? va_arg(ap, u_long) : \ flags&SHORTINT ? (u_long)(u_short)va_arg(ap, int) : \ (u_long)va_arg(ap, u_int)) _DIAGASSERT(fp != NULL); _DIAGASSERT(fmt0 != NULL); FLOCKFILE(fp); /* sorry, fprintf(read_only_file, "") returns -1, not 0 */ if (cantwrite(fp)) { errno = EBADF; FUNLOCKFILE(fp); return (-1); } /* optimise fprintf(stderr) (and other unbuffered Unix files) */ if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) && fp->_file >= 0) { ret = __sbprintf(fp, fmt0, ap); FUNLOCKFILE(fp); return (ret); } fmt = fmt0; uio.uio_iov = iovp = iov; uio.uio_resid = 0; uio.uio_iovcnt = 0; ret = 0; memset(&ps, 0, sizeof(ps)); /* * Scan the format for conversions (`%' character). */ for (;;) { cp = fmt; while ((n = mbrtowc(&wc, fmt, MB_CUR_MAX, &ps)) > 0) { fmt += n; if (wc == '%') { fmt--; break; } } if ((m = fmt - cp) != 0) { PRINT(cp, m); ret += m; } if (n <= 0) goto done; fmt++; /* skip over '%' */ flags = 0; dprec = 0; width = 0; prec = -1; sign = '\0'; rflag: ch = *fmt++; reswitch: switch (ch) { case ' ': /* * ``If the space and + flags both appear, the space * flag will be ignored.'' * -- ANSI X3J11 */ if (!sign) sign = ' '; goto rflag; case '#': flags |= ALT; goto rflag; case '*': /* * ``A negative field width argument is taken as a * - flag followed by a positive field width.'' * -- ANSI X3J11 * They don't exclude field widths read from args. */ if ((width = va_arg(ap, int)) >= 0) goto rflag; width = -width; /* FALLTHROUGH */ case '-': flags |= LADJUST; goto rflag; case '+': sign = '+'; goto rflag; case '.': if ((ch = *fmt++) == '*') { n = va_arg(ap, int); prec = n < 0 ? -1 : n; goto rflag; } n = 0; while (is_digit(ch)) { n = 10 * n + to_digit(ch); ch = *fmt++; } prec = n < 0 ? -1 : n; goto reswitch; case '0': /* * ``Note that 0 is taken as a flag, not as the * beginning of a field width.'' * -- ANSI X3J11 */ flags |= ZEROPAD; goto rflag; case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': n = 0; do { n = 10 * n + to_digit(ch); ch = *fmt++; } while (is_digit(ch)); width = n; goto reswitch; #ifdef FLOATING_POINT case 'L': flags |= LONGDBL; goto rflag; #endif case 'h': flags |= SHORTINT; goto rflag; case 'l': if (*fmt == 'l') { fmt++; flags |= QUADINT; } else { flags |= LONGINT; } goto rflag; case 'q': flags |= QUADINT; goto rflag; case 'c': *buf = va_arg(ap, int); cp = buf; size = 1; sign = '\0'; break; case 'D': flags |= LONGINT; /*FALLTHROUGH*/ case 'd': case 'i': _uquad = SARG(); if ((quad_t)_uquad < 0) { _uquad = -_uquad; sign = '-'; } base = DEC; goto number; #ifdef FLOATING_POINT case 'e': case 'E': case 'f': case 'g': case 'G': if (prec == -1) { prec = DEFPREC; } else if ((ch == 'g' || ch == 'G') && prec == 0) { prec = 1; } if (flags & LONGDBL) { _double = (double) va_arg(ap, long double); } else { _double = va_arg(ap, double); } /* do this before tricky precision changes */ if (isinf(_double)) { if (_double < 0) sign = '-'; cp = "Inf"; size = 3; break; } if (isnan(_double)) { cp = "NaN"; size = 3; break; } flags |= FPT; cp = cvt(_double, prec, flags, &softsign, &expt, ch, &ndig); if (ch == 'g' || ch == 'G') { if (expt <= -4 || expt > prec) ch = (ch == 'g') ? 'e' : 'E'; else ch = 'g'; } if (ch <= 'e') { /* 'e' or 'E' fmt */ --expt; expsize = exponent(expstr, expt, ch); size = expsize + ndig; if (ndig > 1 || flags & ALT) ++size; } else if (ch == 'f') { /* f fmt */ if (expt > 0) { size = expt; if (prec || flags & ALT) size += prec + 1; } else /* "0.X" */ size = prec + 2; } else if (expt >= ndig) { /* fixed g fmt */ size = expt; if (flags & ALT) ++size; } else size = ndig + (expt > 0 ? 1 : 2 - expt); if (softsign) sign = '-'; break; #endif /* FLOATING_POINT */ case 'n': if (flags & QUADINT) *va_arg(ap, quad_t *) = ret; else if (flags & LONGINT) *va_arg(ap, long *) = ret; else if (flags & SHORTINT) *va_arg(ap, short *) = ret; else *va_arg(ap, int *) = ret; continue; /* no output */ case 'O': flags |= LONGINT; /*FALLTHROUGH*/ case 'o': _uquad = UARG(); base = OCT; goto nosign; case 'p': /* * ``The argument shall be a pointer to void. The * value of the pointer is converted to a sequence * of printable characters, in an implementation- * defined manner.'' * -- ANSI X3J11 */ /* NOSTRICT */ _uquad = (u_long)va_arg(ap, void *); base = HEX; xdigs = "0123456789abcdef"; flags |= HEXPREFIX; ch = 'x'; goto nosign; case 's': if ((cp = va_arg(ap, char *)) == NULL) cp = "(null)"; if (prec >= 0) { /* * can't use strlen; can only look for the * NUL in the first `prec' characters, and * strlen() will go further. */ char *p = memchr(cp, 0, (size_t)prec); if (p != NULL) { size = p - cp; if (size > prec) size = prec; } else size = prec; } else size = strlen(cp); sign = '\0'; break; case 'U': flags |= LONGINT; /*FALLTHROUGH*/ case 'u': _uquad = UARG(); base = DEC; goto nosign; case 'X': xdigs = "0123456789ABCDEF"; goto hex; case 'x': xdigs = "0123456789abcdef"; hex: _uquad = UARG(); base = HEX; /* leading 0x/X only if non-zero */ if (flags & ALT && _uquad != 0) flags |= HEXPREFIX; /* unsigned conversions */ nosign: sign = '\0'; /* * ``... diouXx conversions ... if a precision is * specified, the 0 flag will be ignored.'' * -- ANSI X3J11 */ number: if ((dprec = prec) >= 0) flags &= ~ZEROPAD; /* * ``The result of converting a zero value with an * explicit precision of zero is no characters.'' * -- ANSI X3J11 */ bp = buf + BUF; if (_uquad != 0 || prec != 0) { /* * Unsigned mod is hard, and unsigned mod * by a constant is easier than that by * a variable; hence this switch. */ switch (base) { case OCT: do { *--bp = to_char(_uquad & 7); _uquad >>= 3; } while (_uquad); /* handle octal leading 0 */ if (flags & ALT && *bp != '0') *--bp = '0'; break; case DEC: /* many numbers are 1 digit */ while (_uquad >= 10) { *--bp = to_char(_uquad % 10); _uquad /= 10; } *--bp = to_char(_uquad); break; case HEX: do { *--bp = xdigs[(size_t) (_uquad & 15)]; _uquad >>= 4; } while (_uquad); break; default: cp = "bug in vfprintf: bad base"; size = strlen(cp); goto skipsize; } } cp = bp; size = buf + BUF - bp; skipsize: break; default: /* "%?" prints ?, unless ? is NUL */ if (ch == '\0') goto done; /* pretend it was %c with argument ch */ *buf = ch; cp = buf; size = 1; sign = '\0'; break; } /* * All reasonable formats wind up here. At this point, `cp' * points to a string which (if not flags&LADJUST) should be * padded out to `width' places. If flags&ZEROPAD, it should * first be prefixed by any sign or other prefix; otherwise, * it should be blank padded before the prefix is emitted. * After any left-hand padding and prefixing, emit zeroes * required by a decimal [diouxX] precision, then print the * string proper, then emit zeroes required by any leftover * floating precision; finally, if LADJUST, pad with blanks. * * Compute actual size, so we know how much to pad. * size excludes decimal prec; realsz includes it. */ realsz = dprec > size ? dprec : size; if (sign) realsz++; else if (flags & HEXPREFIX) realsz+= 2; /* right-adjusting blank padding */ if ((flags & (LADJUST|ZEROPAD)) == 0) PAD(width - realsz, blanks); /* prefix */ if (sign) { PRINT(&sign, 1); } else if (flags & HEXPREFIX) { ox[0] = '0'; ox[1] = ch; PRINT(ox, 2); } /* right-adjusting zero padding */ if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) PAD(width - realsz, zeroes); /* leading zeroes from decimal precision */ PAD(dprec - size, zeroes); /* the string or number proper */ #ifdef FLOATING_POINT if ((flags & FPT) == 0) { PRINT(cp, size); } else { /* glue together f_p fragments */ if (ch >= 'f') { /* 'f' or 'g' */ if (_double == 0) { /* kludge for __dtoa irregularity */ PRINT("0", 1); if (expt < ndig || (flags & ALT) != 0) { PRINT(decimal_point, 1); PAD(ndig - 1, zeroes); } } else if (expt <= 0) { PRINT("0", 1); PRINT(decimal_point, 1); PAD(-expt, zeroes); PRINT(cp, ndig); } else if (expt >= ndig) { PRINT(cp, ndig); PAD(expt - ndig, zeroes); if (flags & ALT) PRINT(".", 1); } else { PRINT(cp, expt); cp += expt; PRINT(".", 1); PRINT(cp, ndig-expt); } } else { /* 'e' or 'E' */ if (ndig > 1 || flags & ALT) { ox[0] = *cp++; ox[1] = '.'; PRINT(ox, 2); if (_double) { PRINT(cp, ndig-1); } else /* 0.[0..] */ /* __dtoa irregularity */ PAD(ndig - 1, zeroes); } else /* XeYYY */ PRINT(cp, 1); PRINT(expstr, expsize); } } #else PRINT(cp, size); #endif /* left-adjusting padding (always blank) */ if (flags & LADJUST) PAD(width - realsz, blanks); /* finally, adjust ret */ ret += width > realsz ? width : realsz; FLUSH(); /* copy out the I/O vectors */ } done: FLUSH(); error: if (__sferror(fp)) ret = -1; FUNLOCKFILE(fp); return (ret); } #ifdef FLOATING_POINT static char * cvt(value, ndigits, flags, sign, decpt, ch, length) double value; int ndigits, flags, *decpt, ch, *length; char *sign; { int mode, dsgn; char *digits, *bp, *rve; _DIAGASSERT(decpt != NULL); _DIAGASSERT(length != NULL); _DIAGASSERT(sign != NULL); if (ch == 'f') { mode = 3; /* ndigits after the decimal point */ } else { /* To obtain ndigits after the decimal point for the 'e' * and 'E' formats, round to ndigits + 1 significant * figures. */ if (ch == 'e' || ch == 'E') { ndigits++; } mode = 2; /* ndigits significant digits */ } if (value < 0) { value = -value; *sign = '-'; } else *sign = '\000'; digits = __dtoa(value, mode, ndigits, decpt, &dsgn, &rve); if ((ch != 'g' && ch != 'G') || flags & ALT) { /* Print trailing zeros */ bp = digits + ndigits; if (ch == 'f') { if (*digits == '0' && value) *decpt = -ndigits + 1; bp += *decpt; } if (value == 0) /* kludge for __dtoa irregularity */ rve = bp; while (rve < bp) *rve++ = '0'; } *length = rve - digits; return (digits); } static int exponent(p0, exp, fmtch) char *p0; int exp, fmtch; { char *p, *t; char expbuf[MAXEXP]; _DIAGASSERT(p0 != NULL); p = p0; *p++ = fmtch; if (exp < 0) { exp = -exp; *p++ = '-'; } else *p++ = '+'; t = expbuf + MAXEXP; if (exp > 9) { do { *--t = to_char(exp % 10); } while ((exp /= 10) > 9); *--t = to_char(exp); for (; t < expbuf + MAXEXP; *p++ = *t++); } else { *p++ = '0'; *p++ = to_char(exp); } return (p - p0); } #endif /* FLOATING_POINT */