/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License, Version 1.0 only * (the "License"). You may not use this file except in compliance * with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2006 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ /* All Rights Reserved */ /* * University Copyright- Copyright (c) 1982, 1986, 1988 * The Regents of the University of California * All Rights Reserved * * University Acknowledgment- Portions of this document are derived from * software developed by the University of California, Berkeley, and its * contributors. */ #pragma ident "%Z%%M% %I% %E% SMI" /*LINTLIBRARY*/ /* * _doprnt: common code for printf, fprintf, sprintf */ #include "../../../lib/common/inc/c_synonyms.h" #include #include "file64.h" #include #include #include #include #include #include #include #include #include "print.h" /* parameters & macros for doprnt */ #include "stdiom.h" #include #include #include "_locale.h" #include "libc.h" #define PUT(p, n) { unsigned char *newbufptr; \ if ((newbufptr = bufptr + (n)) > bufferend) { \ _dowrite((p), (n), iop, &bufptr); \ } else { \ (void) memcpy(bufptr, (p), (n)); \ bufptr = newbufptr; \ } \ } #define PAD(s, n) { int nn; \ for (nn = (n); nn > 20; nn -= 20) \ _dowrite((s), 20, iop, &bufptr); \ PUT((s), nn); \ } #define SNLEN 5 /* Length of string used when printing a NaN */ /* bit positions for flags used in doprnt */ #define LENGTH 1 /* l */ #define FPLUS 2 /* + */ #define FMINUS 4 /* - */ #define FBLANK 8 /* blank */ #define FSHARP 16 /* # */ #define PADZERO 32 /* padding zeroes requested via '0' */ #define DOTSEEN 64 /* dot appeared in format specification */ #define SUFFIX 128 /* a suffix is to appear in the output */ #define RZERO 256 /* there will be trailing zeros in output */ #define LZERO 512 /* there will be leading zeroes in output */ #define SHORT 1024 /* h */ /* * Positional Parameter information */ #define MAXARGS 30 /* max. number of args for fast positional paramters */ /* * stva_list is used to subvert C's restriction that a variable with an * array type can not appear on the left hand side of an assignment operator. * By putting the array inside a structure, the functionality of assigning to * the whole array through a simple assignment is achieved.. */ typedef struct stva_list { va_list ap; } stva_list; static char _blanks[] = " "; static char _zeroes[] = "00000000000000000000"; static char uc_digs[] = "0123456789ABCDEF"; static char lc_digs[] = "0123456789abcdef"; static char lc_nan[] = "nan0x"; static char uc_nan[] = "NAN0X"; static char lc_inf[] = "inf"; static char uc_inf[] = "INF"; /* * forward declarations */ void _mkarglst(char *, stva_list, stva_list []); void _getarg(char *, stva_list *, int); static int _lowdigit(long *); static void _dowrite(char *, ssize_t, FILE *, unsigned char **); static int _lowdigit(long *valptr) { /* This function computes the decimal low-order digit of the number */ /* pointed to by valptr, and returns this digit after dividing */ /* *valptr by ten. This function is called ONLY to compute the */ /* low-order digit of a long whose high-order bit is set. */ int lowbit = (int)(*valptr & 1); long value = (*valptr >> 1) & ~HIBITL; *valptr = value / 5; return ((int)(value % 5 * 2 + lowbit + '0')); } /* The function _dowrite carries out buffer pointer bookkeeping surrounding */ /* a call to fwrite. It is called only when the end of the file output */ /* buffer is approached or in other unusual situations. */ static void _dowrite(char *p, ssize_t n, FILE *iop, unsigned char **ptrptr) { if (!(iop->_flag & _IOREAD)) { iop->_cnt -= (*ptrptr - iop->_ptr); iop->_ptr = *ptrptr; _bufsync(iop, _bufend(iop)); (void) fwrite(p, 1, n, iop); *ptrptr = iop->_ptr; } else *ptrptr = (unsigned char *) memcpy(*ptrptr, p, n) + n; } int _doprnt(char *format, va_list in_args, FILE *iop) { /* bufptr is used inside of doprnt instead of iop->_ptr; */ /* bufferend is a copy of _bufend(iop), if it exists. For */ /* dummy file descriptors (iop->_flag & _IOREAD), bufferend */ /* may be meaningless. Dummy file descriptors are used so that */ /* sprintf and vsprintf may share the _doprnt routine with the */ /* rest of the printf family. */ unsigned char *bufptr; unsigned char *bufferend; /* This variable counts output characters. */ int count = 0; /* Starting and ending points for value to be printed */ char *bp; char *p; /* Field width and precision */ int width, prec; /* Format code */ int fcode; /* Number of padding zeroes required on the left and right */ int lzero, rzero; /* Flags - bit positions defined by LENGTH, FPLUS, FMINUS, FBLANK, */ /* and FSHARP are set if corresponding character is in format */ /* Bit position defined by PADZERO means extra space in the field */ /* should be padded with leading zeroes rather than with blanks */ int flagword; /* Values are developed in this buffer */ char buf[max(MAXDIGS, 1+max(MAXFCVT+MAXEXP, MAXECVT))]; /* Pointer to sign, "0x", "0X", or empty */ char *prefix; /* Exponent or empty */ char *suffix; /* Buffer to create exponent */ char expbuf[MAXESIZ + 1]; /* Length of prefix and of suffix */ int prefixlength, suffixlength; /* Combined length of leading zeroes, trailing zeroes, and suffix */ int otherlength; /* The value being converted, if integer */ long val; /* The value being converted, if real */ double dval; /* Output values from fcvt and ecvt */ int decpt, sign; /* Pointer to a translate table for digits of whatever radix */ char *tab; /* Work variables */ int k, lradix, mradix; /* Variables used to flag an infinities and nans, resp. */ /* Nan_flg is used with two purposes: to flag a NaN and */ /* as the length of the string ``NAN0X'' (``nan0x'') */ int inf_nan = 0, NaN_flg = 0; /* Pointer to string "NAN0X" or "nan0x" */ char *SNAN; /* Flag for negative infinity or NaN */ int neg_in = 0; /* variables for positional parameters */ char *sformat = format; /* save the beginning of the format */ int fpos = 1; /* 1 if first positional parameter */ stva_list args; /* used to step through the argument list */ stva_list sargs; /* used to save the start of the argument list */ stva_list bargs; /* used to restore args if positional width or precision */ stva_list arglst[MAXARGS]; /* * array giving the appropriate values for va_arg() to * retrieve the corresponding argument: * arglst[0] is the first argument, * arglst[1] is the second argument, etc. */ int starflg = 0; /* set to 1 if * format specifier seen */ /* * Initialize args and sargs to the start of the argument list. * Note that ANSI guarantees that the address of the first member of * a structure will be the same as the address of the structure. * See equivalent code in libc doprnt.c */ #if !(defined(__amd64) && defined(__GNUC__)) /* XX64 - fix me */ va_copy(args.ap, in_args); #endif sargs = args; /* if first I/O to the stream get a buffer */ /* Note that iop->_base should not equal 0 for sprintf and vsprintf */ if (iop->_base == 0 && _findbuf(iop) == 0) return (EOF); /* initialize buffer pointer and buffer end pointer */ bufptr = iop->_ptr; bufferend = (iop->_flag & _IOREAD) ? (unsigned char *)((long)bufptr | (-1L & ~HIBITL)) : _bufend(iop); /* * The main loop -- this loop goes through one iteration * for each string of ordinary characters or format specification. */ for (;;) { ptrdiff_t pdiff; if ((fcode = *format) != '\0' && fcode != '%') { bp = format; do { format++; } while ((fcode = *format) != '\0' && fcode != '%'); pdiff = format - bp; /* pdiff = no. of non-% chars */ count += pdiff; PUT(bp, pdiff); } if (fcode == '\0') { /* end of format; return */ ptrdiff_t d = bufptr - iop->_ptr; iop->_cnt -= d; iop->_ptr = bufptr; if (bufptr + iop->_cnt > bufferend && !(iop->_flag & _IOREAD)) _bufsync(iop, bufferend); /* * in case of interrupt during last * several lines */ if (iop->_flag & (_IONBF | _IOLBF) && (iop->_flag & _IONBF || memchr((char *)(bufptr-count), '\n', count) != NULL)) (void) _xflsbuf(iop); return (ferror(iop) ? EOF : count); } /* * % has been found. * The following switch is used to parse the format * specification and to perform the operation specified * by the format letter. The program repeatedly goes * back to this switch until the format letter is * encountered. */ width = prefixlength = otherlength = flagword = suffixlength = 0; format++; charswitch: switch (fcode = *format++) { case '+': flagword |= FPLUS; goto charswitch; case '-': flagword |= FMINUS; flagword &= ~PADZERO; /* ignore 0 flag */ goto charswitch; case ' ': flagword |= FBLANK; goto charswitch; case '#': flagword |= FSHARP; goto charswitch; /* Scan the field width and precision */ case '.': flagword |= DOTSEEN; prec = 0; goto charswitch; case '*': if (isdigit(*format)) { starflg = 1; bargs = args; goto charswitch; } if (!(flagword & DOTSEEN)) { width = va_arg(args.ap, int); if (width < 0) { width = -width; flagword ^= FMINUS; } } else { prec = va_arg(args.ap, int); if (prec < 0) prec = 0; } goto charswitch; case '$': { int position; stva_list targs; if (fpos) { _mkarglst(sformat, sargs, arglst); fpos = 0; } if (flagword & DOTSEEN) { position = prec; prec = 0; } else { position = width; width = 0; } if (position <= 0) { /* illegal position */ format--; continue; } if (position <= MAXARGS) { targs = arglst[position - 1]; } else { targs = arglst[MAXARGS - 1]; _getarg(sformat, &targs, position); } if (!starflg) args = targs; else { starflg = 0; args = bargs; if (flagword & DOTSEEN) prec = va_arg(targs.ap, int); else width = va_arg(targs.ap, int); } goto charswitch; } case '0': /* obsolescent spec: leading zero in width */ /* means pad with leading zeros */ if (!(flagword & (DOTSEEN | FMINUS))) flagword |= PADZERO; /* FALLTHROUGH */ case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': { int num = fcode - '0'; while (isdigit(fcode = *format)) { num = num * 10 + fcode - '0'; format++; } if (flagword & DOTSEEN) prec = num; else width = num; goto charswitch; } /* Scan the length modifier */ case 'l': flagword |= LENGTH; goto charswitch; case 'h': flagword |= SHORT; goto charswitch; case 'L': goto charswitch; /* * The character addressed by format must be * the format letter -- there is nothing * left for it to be. * * The status of the +, -, #, and blank * flags are reflected in the variable * "flagword". "width" and "prec" contain * numbers corresponding to the digit * strings before and after the decimal * point, respectively. If there was no * decimal point, then flagword & DOTSEEN * is false and the value of prec is meaningless. * * The following switch cases set things up * for printing. What ultimately gets * printed will be padding blanks, a * prefix, left padding zeroes, a value, * right padding zeroes, a suffix, and * more padding blanks. Padding blanks * will not appear simultaneously on both * the left and the right. Each case in * this switch will compute the value, and * leave in several variables the informa- * tion necessary to construct what is to * be printed. * * The prefix is a sign, a blank, "0x", * "0X", or null, and is addressed by * "prefix". * * The suffix is either null or an * exponent, and is addressed by "suffix". * If there is a suffix, the flagword bit * SUFFIX will be set. * * The value to be printed starts at "bp" * and continues up to and not including * "p". * * "lzero" and "rzero" will contain the * number of padding zeroes required on * the left and right, respectively. * The flagword bits LZERO and RZERO tell * whether padding zeros are required. * * The number of padding blanks, and * whether they go on the left or the * right, will be computed on exit from * the switch. */ /* * decimal fixed point representations * * HIBITL is 100...000 * binary, and is equal to the maximum * negative number. * We assume a 2's complement machine */ case 'i': case 'd': /* Fetch the argument to be printed */ if (flagword & LENGTH) val = va_arg(args.ap, long); else val = va_arg(args.ap, int); if (flagword & SHORT) val = (short)val; /* Set buffer pointer to last digit */ p = bp = buf + MAXDIGS; /* If signed conversion, make sign */ if (val < 0) { prefix = "-"; prefixlength = 1; /* * Negate, checking in * advance for possible * overflow. */ if (val != HIBITL) val = -val; else /* number is -HIBITL; convert last */ /* digit now and get positive number */ *--bp = _lowdigit(&val); } else if (flagword & FPLUS) { prefix = "+"; prefixlength = 1; } else if (flagword & FBLANK) { prefix = " "; prefixlength = 1; } decimal: { long qval = val; long saveq; if (qval <= 9) { if (qval != 0 || !(flagword & DOTSEEN)) *--bp = (char)(qval + '0'); } else { do { saveq = qval; qval /= 10; *--bp = (char)(saveq - qval * 10 + '0'); } while (qval > 9); *--bp = (char)(qval + '0'); pdiff = (ptrdiff_t)saveq; } } /* Calculate minimum padding zero requirement */ if (flagword & DOTSEEN) { int leadzeroes = prec - (int)(p - bp); if (leadzeroes > 0) { otherlength = lzero = leadzeroes; flagword |= LZERO; } } break; case 'u': /* Fetch the argument to be printed */ if (flagword & LENGTH) val = va_arg(args.ap, long); else val = va_arg(args.ap, unsigned); if (flagword & SHORT) val = (unsigned short)val; p = bp = buf + MAXDIGS; if (val & HIBITL) *--bp = _lowdigit(&val); goto decimal; /* * non-decimal fixed point representations * for radix equal to a power of two * * "mradix" is one less than the radix for the conversion. * "lradix" is one less than the base 2 log * of the radix for the conversion. Conversion is unsigned. * HIBITL is 100...000 * binary, and is equal to the maximum * negative number. * We assume a 2's complement machine */ case 'o': mradix = 7; lradix = 2; goto fixed; case 'X': case 'x': case 'p': mradix = 15; lradix = 3; fixed: /* Fetch the argument to be printed */ if (flagword & LENGTH) val = va_arg(args.ap, long); else val = va_arg(args.ap, unsigned); if (flagword & SHORT) val = (unsigned short)val; /* Set translate table for digits */ tab = (fcode == 'X') ? uc_digs : lc_digs; /* Entry point when printing a double which is a NaN */ put_pc: /* Develop the digits of the value */ p = bp = buf + MAXDIGS; { long qval = val; if (qval == 0) { if (!(flagword & DOTSEEN)) { otherlength = lzero = 1; flagword |= LZERO; } } else do { *--bp = tab[qval & mradix]; qval = ((qval >> 1) & ~HIBITL) >> lradix; } while (qval != 0); } /* Calculate minimum padding zero requirement */ if (flagword & DOTSEEN) { int leadzeroes = prec - (int)(p - bp); if (leadzeroes > 0) { otherlength = lzero = leadzeroes; flagword |= LZERO; } } /* Handle the # flag */ if (flagword & FSHARP && val != 0) switch (fcode) { case 'o': if (!(flagword & LZERO)) { otherlength = lzero = 1; flagword |= LZERO; } break; case 'x': prefix = "0x"; prefixlength = 2; break; case 'X': prefix = "0X"; prefixlength = 2; break; } break; case 'E': case 'e': /* * E-format. The general strategy * here is fairly easy: we take * what ecvt gives us and re-format it. */ /* Establish default precision */ if (!(flagword & DOTSEEN)) prec = 6; /* Fetch the value */ dval = va_arg(args.ap, double); /* Check for NaNs and Infinities */ if (IsNANorINF(dval)) { if (IsINF(dval)) { if (IsNegNAN(dval)) neg_in = 1; inf_nan = 1; bp = (fcode == 'E')? uc_inf: lc_inf; p = bp + 3; break; } else { if (IsNegNAN(dval)) neg_in = 1; inf_nan = 1; val = GETNaNPC(dval); NaN_flg = SNLEN; mradix = 15; lradix = 3; if (fcode == 'E') { SNAN = uc_nan; tab = uc_digs; } else { SNAN = lc_nan; tab = lc_digs; } goto put_pc; } } /* Develop the mantissa */ bp = ecvt(dval, min(prec + 1, MAXECVT), &decpt, &sign); /* Determine the prefix */ e_merge: if (sign) { prefix = "-"; prefixlength = 1; } else if (flagword & FPLUS) { prefix = "+"; prefixlength = 1; } else if (flagword & FBLANK) { prefix = " "; prefixlength = 1; } /* Place the first digit in the buffer */ p = &buf[0]; *p++ = (*bp != '\0') ? *bp++ : '0'; /* Put in a decimal point if needed */ if (prec != 0 || (flagword & FSHARP)) *p++ = _numeric[0]; /* Create the rest of the mantissa */ { int rz = prec; for (; rz > 0 && *bp != '\0'; --rz) *p++ = *bp++; if (rz > 0) { otherlength = rzero = rz; flagword |= RZERO; } } bp = &buf[0]; /* Create the exponent */ *(suffix = &expbuf[MAXESIZ]) = '\0'; if (dval != 0) { int nn = decpt - 1; if (nn < 0) nn = -nn; for (; nn > 9; nn /= 10) *--suffix = todigit(nn % 10); *--suffix = todigit(nn); } /* Prepend leading zeroes to the exponent */ while (suffix > &expbuf[MAXESIZ - 2]) *--suffix = '0'; /* Put in the exponent sign */ *--suffix = (decpt > 0 || dval == 0) ? '+' : '-'; /* Put in the e */ *--suffix = isupper(fcode) ? 'E' : 'e'; /* compute size of suffix */ otherlength += (suffixlength = (int)(&expbuf[MAXESIZ] - suffix)); flagword |= SUFFIX; break; case 'f': /* * F-format floating point. This is a * good deal less simple than E-format. * The overall strategy will be to call * fcvt, reformat its result into buf, * and calculate how many trailing * zeroes will be required. There will * never be any leading zeroes needed. */ /* Establish default precision */ if (!(flagword & DOTSEEN)) prec = 6; /* Fetch the value */ dval = va_arg(args.ap, double); /* Check for NaNs and Infinities */ if (IsNANorINF(dval)) { if (IsINF(dval)) { if (IsNegNAN(dval)) neg_in = 1; inf_nan = 1; bp = lc_inf; p = bp + 3; break; } else { if (IsNegNAN(dval)) neg_in = 1; inf_nan = 1; val = GETNaNPC(dval); NaN_flg = SNLEN; mradix = 15; lradix = 3; tab = lc_digs; SNAN = lc_nan; goto put_pc; } } /* Do the conversion */ bp = fcvt(dval, min(prec, MAXFCVT), &decpt, &sign); /* Determine the prefix */ f_merge: if (sign) { prefix = "-"; prefixlength = 1; } else if (flagword & FPLUS) { prefix = "+"; prefixlength = 1; } else if (flagword & FBLANK) { prefix = " "; prefixlength = 1; } /* Initialize buffer pointer */ p = &buf[0]; { int nn = decpt; /* Emit the digits before the decimal point */ k = 0; do { *p++ = (nn <= 0 || *bp == '\0' || k >= MAXFSIG) ? '0' : (k++, *bp++); } while (--nn > 0); /* Decide whether we need a decimal point */ if ((flagword & FSHARP) || prec > 0) *p++ = _numeric[0]; /* Digits (if any) after the decimal point */ nn = min(prec, MAXFCVT); if (prec > nn) { flagword |= RZERO; otherlength = rzero = prec - nn; } while (--nn >= 0) *p++ = (++decpt <= 0 || *bp == '\0' || k >= MAXFSIG) ? '0' : (k++, *bp++); } bp = &buf[0]; break; case 'G': case 'g': /* * g-format. We play around a bit * and then jump into e or f, as needed. */ /* Establish default precision */ if (!(flagword & DOTSEEN)) prec = 6; else if (prec == 0) prec = 1; /* Fetch the value */ dval = va_arg(args.ap, double); /* Check for NaN and Infinities */ if (IsNANorINF(dval)) { if (IsINF(dval)) { if (IsNegNAN(dval)) neg_in = 1; bp = (fcode == 'G') ? uc_inf : lc_inf; p = bp + 3; inf_nan = 1; break; } else { if (IsNegNAN(dval)) neg_in = 1; inf_nan = 1; val = GETNaNPC(dval); NaN_flg = SNLEN; mradix = 15; lradix = 3; if (fcode == 'G') { SNAN = uc_nan; tab = uc_digs; } else { SNAN = lc_nan; tab = lc_digs; } goto put_pc; } } /* Do the conversion */ bp = ecvt(dval, min(prec, MAXECVT), &decpt, &sign); if (dval == 0) decpt = 1; { int kk = prec; size_t sz; if (!(flagword & FSHARP)) { sz = strlen(bp); if (sz < kk) kk = (int)sz; while (kk >= 1 && bp[kk-1] == '0') --kk; } if (decpt < -3 || decpt > prec) { prec = kk - 1; goto e_merge; } prec = kk - decpt; goto f_merge; } case '%': buf[0] = (char)fcode; goto c_merge; case 'c': buf[0] = va_arg(args.ap, int); c_merge: p = (bp = &buf[0]) + 1; break; case 's': bp = va_arg(args.ap, char *); if (!(flagword & DOTSEEN)) p = bp + strlen(bp); else { /* a strnlen function would be useful here! */ char *qp = bp; while (*qp++ != '\0' && --prec >= 0) ; p = qp - 1; } break; case 'n': { if (flagword & LENGTH) { long *svcount; svcount = va_arg(args.ap, long *); *svcount = count; } else if (flagword & SHORT) { short *svcount; svcount = va_arg(args.ap, short *); *svcount = (short)count; } else { int *svcount; svcount = va_arg(args.ap, int *); *svcount = count; } continue; } default: /* this is technically an error; what we do is to */ /* back up the format pointer to the offending char */ /* and continue with the format scan */ format--; continue; } if (inf_nan) { if (neg_in) { prefix = "-"; prefixlength = 1; neg_in = 0; } else if (flagword & FPLUS) { prefix = "+"; prefixlength = 1; } else if (flagword & FBLANK) { prefix = " "; prefixlength = 1; } inf_nan = 0; } /* Calculate number of padding blanks */ k = (int)(pdiff = p - bp) + prefixlength + otherlength + NaN_flg; if (width <= k) count += k; else { count += width; /* Set up for padding zeroes if requested */ /* Otherwise emit padding blanks unless output is */ /* to be left-justified. */ if (flagword & PADZERO) { if (!(flagword & LZERO)) { flagword |= LZERO; lzero = width - k; } else lzero += width - k; k = width; /* cancel padding blanks */ } else /* Blanks on left if required */ if (!(flagword & FMINUS)) PAD(_blanks, width - k); } /* Prefix, if any */ if (prefixlength != 0) PUT(prefix, prefixlength); /* If value is NaN, put string NaN */ if (NaN_flg) { PUT(SNAN, SNLEN); NaN_flg = 0; } /* Zeroes on the left */ if (flagword & LZERO) PAD(_zeroes, lzero); /* The value itself */ if (pdiff > 0) PUT(bp, pdiff); if (flagword & (RZERO | SUFFIX | FMINUS)) { /* Zeroes on the right */ if (flagword & RZERO) PAD(_zeroes, rzero); /* The suffix */ if (flagword & SUFFIX) PUT(suffix, suffixlength); /* Blanks on the right if required */ if (flagword & FMINUS && width > k) PAD(_blanks, width - k); } } } /* * This function initializes arglst, to contain the appropriate va_list values * for the first MAXARGS arguments. */ void _mkarglst(char *fmt, stva_list args, stva_list arglst[]) { static char digits[] = "01234567890", skips[] = "# +-.0123456789hL$"; enum types {INT = 1, LONG, CHAR_PTR, DOUBLE, LONG_DOUBLE, VOID_PTR, LONG_PTR, INT_PTR}; enum types typelst[MAXARGS], curtype; int maxnum, n, curargno, flags; /* * Algorithm 1. set all argument types to zero. * 2. walk through fmt putting arg types in typelst[]. * 3. walk through args using va_arg(args.ap, typelst[n]) * and set arglst[] to the appropriate values. * Assumptions: Cannot use %*$... to specify variable position. */ (void) memset((void *)typelst, 0, sizeof (typelst)); maxnum = -1; curargno = 0; while ((fmt = strchr(fmt, '%')) != 0) { size_t sz; fmt++; /* skip % */ if (fmt[sz = strspn(fmt, digits)] == '$') { curargno = atoi(fmt) - 1; /* convert to zero base */ if (curargno < 0) continue; fmt += sz + 1; } flags = 0; again:; fmt += strspn(fmt, skips); switch (*fmt++) { case '%': /* there is no argument! */ continue; case 'l': flags |= 0x1; goto again; case '*': /* int argument used for value */ /* check if there is a positional parameter */ if (isdigit(*fmt)) { int targno; targno = atoi(fmt) - 1; fmt += strspn(fmt, digits); if (*fmt == '$') fmt++; /* skip '$' */ if (targno >= 0 && targno < MAXARGS) { typelst[targno] = INT; if (maxnum < targno) maxnum = targno; } goto again; } flags |= 0x2; curtype = INT; break; case 'e': case 'E': case 'f': case 'g': case 'G': curtype = DOUBLE; break; case 's': curtype = CHAR_PTR; break; case 'p': curtype = VOID_PTR; break; case 'n': if (flags & 0x1) curtype = LONG_PTR; else curtype = INT_PTR; break; default: if (flags & 0x1) curtype = LONG; else curtype = INT; break; } if (curargno >= 0 && curargno < MAXARGS) { typelst[curargno] = curtype; if (maxnum < curargno) maxnum = curargno; } curargno++; /* default to next in list */ if (flags & 0x2) /* took care of *, keep going */ { flags ^= 0x2; goto again; } } for (n = 0; n <= maxnum; n++) { arglst[n] = args; if (typelst[n] == 0) typelst[n] = INT; switch (typelst[n]) { case INT: (void) va_arg(args.ap, int); break; case LONG: (void) va_arg(args.ap, long); break; case CHAR_PTR: (void) va_arg(args.ap, char *); break; case DOUBLE: (void) va_arg(args.ap, double); break; case LONG_DOUBLE: (void) va_arg(args.ap, double); break; case VOID_PTR: (void) va_arg(args.ap, void *); break; case LONG_PTR: (void) va_arg(args.ap, long *); break; case INT_PTR: (void) va_arg(args.ap, int *); break; } } } /* * This function is used to find the va_list value for arguments whose * position is greater than MAXARGS. This function is slow, so hopefully * MAXARGS will be big enough so that this function need only be called in * unusual circumstances. * pargs is assumed to contain the value of arglst[MAXARGS - 1]. */ void _getarg(char *fmt, stva_list *pargs, int argno) { static char digits[] = "01234567890", skips[] = "# +-.0123456789h$"; int i, curargno, flags; size_t n; char *sfmt = fmt; int found = 1; i = MAXARGS; curargno = 1; while (found) { fmt = sfmt; found = 0; while ((i != argno) && (fmt = strchr(fmt, '%')) != 0) { fmt++; /* skip % */ if (fmt[n = strspn(fmt, digits)] == '$') { curargno = atoi(fmt); if (curargno <= 0) continue; fmt += n + 1; } /* find conversion specifier for next argument */ if (i != curargno) { curargno++; continue; } else found = 1; flags = 0; again:; fmt += strspn(fmt, skips); switch (*fmt++) { case '%': /* there is no argument! */ continue; case 'l': flags |= 0x1; goto again; case '*': /* int argument used for value */ /* * check if there is a positional parameter; * if so, just skip it; its size will be * correctly determined by default */ if (isdigit(*fmt)) { fmt += strspn(fmt, digits); if (*fmt == '$') fmt++; /* skip '$' */ goto again; } flags |= 0x2; (void) va_arg((*pargs).ap, int); break; case 'e': case 'E': case 'f': case 'g': case 'G': if (flags & 0x1) (void) va_arg((*pargs).ap, double); else (void) va_arg((*pargs).ap, double); break; case 's': (void) va_arg((*pargs).ap, char *); break; case 'p': (void) va_arg((*pargs).ap, void *); break; case 'n': if (flags & 0x1) (void) va_arg((*pargs).ap, long *); else (void) va_arg((*pargs).ap, int *); break; default: if (flags & 0x1) (void) va_arg((*pargs).ap, long int); else (void) va_arg((*pargs).ap, int); break; } i++; curargno++; /* default to next in list */ if (flags & 0x2) /* took care of *, keep going */ { flags ^= 0x2; goto again; } } /* * missing specifier for parameter, assume parameter is an int */ if (!found && i != argno) { (void) va_arg((*pargs).ap, int); i++; curargno = i; found = 1; } } }