/*- * 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. */ #if defined(LIBC_SCCS) && !defined(lint) static char sccsid[] = "@(#)vfprintf.c 5.47 (Berkeley) 3/22/91"; #endif /* LIBC_SCCS and not lint */ /* * Actual printf innards. * * This code is large and complicated... */ #include #include #include #include #if __STDC__ #include #else #include #endif #include "local.h" #include "fvwrite.h" /* * Define FLOATING_POINT to get floating point. * Define CSH to get a csh-specific version (grr). */ #ifndef CSH #define FLOATING_POINT #endif /* end of configuration stuff */ #ifdef CSH /* * C shell hacks. Ick, gag. */ #undef BUFSIZ #include "sh.h" #if __STDC__ int printf(const char *fmt, ...) { FILE f; va_list ap; int ret; va_start(ap, fmt); f._flags = __SWR; f._write = NULL; ret = vfprintf(&f, fmt, ap); va_end(ap); return ret; } #else int printf(fmt, args) char *fmt; { FILE f; f._flags = __SWR; f._write = NULL; return (vfprintf(&f, fmt, &args)); } #endif int __sprint(fp, uio) FILE *fp; register struct __suio *uio; { register char *p; register int n, ch, iovcnt; register struct __siov *iov; /* must allow sprintf to work, might as well allow others too */ if (fp->_write || fp->_flags & __SSTR) { if (uio->uio_resid == 0) { uio->uio_iovcnt = 0; return (0); } n = __sfvwrite(fp, uio); uio->uio_resid = 0; uio->uio_iovcnt = 0; return (n); } iov = uio->uio_iov; for (iovcnt = uio->uio_iovcnt; --iovcnt >= 0; iov++) { for (p = iov->iov_base, n = iov->iov_len; --n >= 0;) { #ifdef CSHPUTCHAR ch = *p++; CSHPUTCHAR; /* this horrid macro uses `ch' */ #else #undef putchar putchar(*p++); #endif } } uio->uio_resid = 0; uio->uio_iovcnt = 0; return (0); } #else /* CSH */ /* * 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; register struct __suio *uio; { register int err; 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) register FILE *fp; const char *fmt; va_list ap; { int ret; FILE fake; unsigned char buf[BUFSIZ]; /* 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 = EOF; if (fake._flags & __SERR) fp->_flags |= __SERR; return (ret); } #endif /* CSH */ #ifdef FLOATING_POINT #include "floatio.h" #define BUF (MAXEXP+MAXFRACT+1) /* + decimal point */ #define DEFPREC 6 static int cvt(); #else /* no FLOATING_POINT */ #define BUF 40 #endif /* FLOATING_POINT */ /* * 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) ((n) + '0') /* * Flags used during conversion. */ #define LONGINT 0x01 /* long integer */ #define LONGDBL 0x02 /* long double; unimplemented */ #define SHORTINT 0x04 /* short integer */ #define ALT 0x08 /* alternate form */ #define LADJUST 0x10 /* left adjustment */ #define ZEROPAD 0x20 /* zero (as opposed to blank) pad */ #define HEXPREFIX 0x40 /* add 0x or 0X prefix */ int vfprintf(fp, fmt0, ap) FILE *fp; const char *fmt0; #if tahoe register /* technically illegal, since we do not know what type va_list is */ #endif va_list ap; { register char *fmt; /* format string */ register int ch; /* character from fmt */ register int n; /* handy integer (short term usage) */ register char *cp; /* handy char pointer (short term usage) */ register struct __siov *iovp;/* for PRINT macro */ register 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) */ #ifdef FLOATING_POINT char softsign; /* temporary negative sign for floats */ double _double; /* double precision arguments %[eEfgG] */ int fpprec; /* `extra' floating precision in [eEfgG] */ #endif u_long _ulong; /* integer arguments %[diouxX] */ enum { OCT, DEC, HEX } base;/* base for [diouxX] conversion */ int dprec; /* a copy of prec if [diouxX], 0 otherwise */ int fieldsz; /* field size expanded by sign, etc */ int realsz; /* field size expanded by dprec */ int size; /* size of converted field or string */ char *xdigs; /* 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 char blanks[PADSIZE] = {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '}; static 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 = (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&LONGINT ? va_arg(ap, long) : \ flags&SHORTINT ? (long)(short)va_arg(ap, int) : \ (long)va_arg(ap, int)) #define UARG() \ (flags&LONGINT ? va_arg(ap, u_long) : \ flags&SHORTINT ? (u_long)(u_short)va_arg(ap, int) : \ (u_long)va_arg(ap, u_int)) #ifndef CSH /* sorry, fprintf(read_only_file, "") returns EOF, not 0 */ if (cantwrite(fp)) return (EOF); /* optimise fprintf(stderr) (and other unbuffered Unix files) */ if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) && fp->_file >= 0) return (__sbprintf(fp, fmt0, ap)); #endif /* CSH */ fmt = (char *)fmt0; uio.uio_iov = iovp = iov; uio.uio_resid = 0; uio.uio_iovcnt = 0; ret = 0; /* * Scan the format for conversions (`%' character). */ for (;;) { for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++) /* void */; if ((n = fmt - cp) != 0) { PRINT(cp, n); ret += n; } if (ch == '\0') goto done; fmt++; /* skip over '%' */ flags = 0; dprec = 0; #ifdef FLOATING_POINT fpprec = 0; #endif 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': flags |= LONGINT; goto rflag; case 'c': *(cp = buf) = va_arg(ap, int); size = 1; sign = '\0'; break; case 'D': flags |= LONGINT; /*FALLTHROUGH*/ case 'd': case 'i': _ulong = SARG(); if ((long)_ulong < 0) { _ulong = -_ulong; sign = '-'; } base = DEC; goto number; #ifdef FLOATING_POINT case 'e': case 'E': case 'f': case 'g': case 'G': _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; } /* * don't do unrealistic precision; just pad it with * zeroes later, so buffer size stays rational. */ if (prec > MAXFRACT) { if (ch != 'g' && ch != 'G' || (flags&ALT)) fpprec = prec - MAXFRACT; prec = MAXFRACT; } else if (prec == -1) prec = DEFPREC; /* * cvt may have to round up before the "start" of * its buffer, i.e. ``intf("%.2f", (double)9.999);''; * if the first character is still NUL, it did. * softsign avoids negative 0 if _double < 0 but * no significant digits will be shown. */ cp = buf; *cp = '\0'; size = cvt(_double, prec, flags, &softsign, ch, cp, buf + sizeof(buf)); if (softsign) sign = '-'; if (*cp == '\0') cp++; break; #endif /* FLOATING_POINT */ case 'n': 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': _ulong = 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 */ _ulong = (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, 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': _ulong = UARG(); base = DEC; goto nosign; case 'X': xdigs = "0123456789ABCDEF"; goto hex; case 'x': xdigs = "0123456789abcdef"; hex: _ulong = UARG(); base = HEX; /* leading 0x/X only if non-zero */ if (flags & ALT && _ulong != 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 */ cp = buf + BUF; if (_ulong != 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 { *--cp = to_char(_ulong & 7); _ulong >>= 3; } while (_ulong); /* handle octal leading 0 */ if (flags & ALT && *cp != '0') *--cp = '0'; break; case DEC: /* many numbers are 1 digit */ while (_ulong >= 10) { *--cp = to_char(_ulong % 10); _ulong /= 10; } *--cp = to_char(_ulong); break; case HEX: do { *--cp = xdigs[_ulong & 15]; _ulong >>= 4; } while (_ulong); break; default: cp = "bug in vfprintf: bad base"; size = strlen(cp); goto skipsize; } } size = buf + BUF - cp; skipsize: break; default: /* "%?" prints ?, unless ? is NUL */ if (ch == '\0') goto done; /* pretend it was %c with argument ch */ cp = buf; *cp = ch; 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. * fieldsz excludes decimal prec; realsz includes it */ #ifdef FLOATING_POINT fieldsz = size + fpprec; #else fieldsz = size; #endif if (sign) fieldsz++; else if (flags & HEXPREFIX) fieldsz += 2; realsz = dprec > fieldsz ? dprec : fieldsz; /* 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 - fieldsz, zeroes); /* the string or number proper */ PRINT(cp, size); #ifdef FLOATING_POINT /* trailing f.p. zeroes */ PAD(fpprec, zeroes); #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: return (__sferror(fp) ? EOF : ret); /* NOTREACHED */ } #ifdef FLOATING_POINT #include static char *exponent(); static char *round(); static int cvt(number, prec, flags, signp, fmtch, startp, endp) double number; register int prec; int flags; char *signp; int fmtch; char *startp, *endp; { register char *p, *t; register double fract; int dotrim, expcnt, gformat; double integer, tmp; dotrim = expcnt = gformat = 0; if (number < 0) { number = -number; *signp = '-'; } else *signp = 0; fract = modf(number, &integer); /* get an extra slot for rounding. */ t = ++startp; /* * get integer portion of number; put into the end of the buffer; the * .01 is added for modf(356.0 / 10, &integer) returning .59999999... */ for (p = endp - 1; integer; ++expcnt) { tmp = modf(integer / 10, &integer); *p-- = to_char((int)((tmp + .01) * 10)); } switch (fmtch) { case 'f': /* reverse integer into beginning of buffer */ if (expcnt) for (; ++p < endp; *t++ = *p); else *t++ = '0'; /* * if precision required or alternate flag set, add in a * decimal point. */ if (prec || flags&ALT) *t++ = '.'; /* if requires more precision and some fraction left */ if (fract) { if (prec) do { fract = modf(fract * 10, &tmp); *t++ = to_char((int)tmp); } while (--prec && fract); if (fract) startp = round(fract, (int *)NULL, startp, t - 1, (char)0, signp); } for (; prec--; *t++ = '0'); break; case 'e': case 'E': eformat: if (expcnt) { *t++ = *++p; if (prec || flags&ALT) *t++ = '.'; /* if requires more precision and some integer left */ for (; prec && ++p < endp; --prec) *t++ = *p; /* * if done precision and more of the integer component, * round using it; adjust fract so we don't re-round * later. */ if (!prec && ++p < endp) { fract = 0; startp = round((double)0, &expcnt, startp, t - 1, *p, signp); } /* adjust expcnt for digit in front of decimal */ --expcnt; } /* until first fractional digit, decrement exponent */ else if (fract) { /* adjust expcnt for digit in front of decimal */ for (expcnt = -1;; --expcnt) { fract = modf(fract * 10, &tmp); if (tmp) break; } *t++ = to_char((int)tmp); if (prec || flags&ALT) *t++ = '.'; } else { *t++ = '0'; if (prec || flags&ALT) *t++ = '.'; } /* if requires more precision and some fraction left */ if (fract) { if (prec) do { fract = modf(fract * 10, &tmp); *t++ = to_char((int)tmp); } while (--prec && fract); if (fract) startp = round(fract, &expcnt, startp, t - 1, (char)0, signp); } /* if requires more precision */ for (; prec--; *t++ = '0'); /* unless alternate flag, trim any g/G format trailing 0's */ if (gformat && !(flags&ALT)) { while (t > startp && *--t == '0'); if (*t == '.') --t; ++t; } t = exponent(t, expcnt, fmtch); break; case 'g': case 'G': /* a precision of 0 is treated as a precision of 1. */ if (!prec) ++prec; /* * ``The style used depends on the value converted; style e * will be used only if the exponent resulting from the * conversion is less than -4 or greater than the precision.'' * -- ANSI X3J11 */ if (expcnt > prec || !expcnt && fract && fract < .0001) { /* * g/G format counts "significant digits, not digits of * precision; for the e/E format, this just causes an * off-by-one problem, i.e. g/G considers the digit * before the decimal point significant and e/E doesn't * count it as precision. */ --prec; fmtch -= 2; /* G->E, g->e */ gformat = 1; goto eformat; } /* * reverse integer into beginning of buffer, * note, decrement precision */ if (expcnt) for (; ++p < endp; *t++ = *p, --prec); else *t++ = '0'; /* * if precision required or alternate flag set, add in a * decimal point. If no digits yet, add in leading 0. */ if (prec || flags&ALT) { dotrim = 1; *t++ = '.'; } else dotrim = 0; /* if requires more precision and some fraction left */ if (fract) { if (prec) { do { fract = modf(fract * 10, &tmp); *t++ = to_char((int)tmp); } while(!tmp); while (--prec && fract) { fract = modf(fract * 10, &tmp); *t++ = to_char((int)tmp); } } if (fract) startp = round(fract, (int *)NULL, startp, t - 1, (char)0, signp); } /* alternate format, adds 0's for precision, else trim 0's */ if (flags&ALT) for (; prec--; *t++ = '0'); else if (dotrim) { while (t > startp && *--t == '0'); if (*t != '.') ++t; } } return (t - startp); } static char * round(fract, exp, start, end, ch, signp) double fract; int *exp; register char *start, *end; char ch, *signp; { double tmp; if (fract) (void)modf(fract * 10, &tmp); else tmp = to_digit(ch); if (tmp > 4) for (;; --end) { if (*end == '.') --end; if (++*end <= '9') break; *end = '0'; if (end == start) { if (exp) { /* e/E; increment exponent */ *end = '1'; ++*exp; } else { /* f; add extra digit */ *--end = '1'; --start; } break; } } /* ``"%.3f", (double)-0.0004'' gives you a negative 0. */ else if (*signp == '-') for (;; --end) { if (*end == '.') --end; if (*end != '0') break; if (end == start) *signp = 0; } return (start); } static char * exponent(p, exp, fmtch) register char *p; register int exp; int fmtch; { register char *t; char expbuf[MAXEXP]; *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); } #endif /* FLOATING_POINT */