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IABSD.fr/src/lib/libc/stdio/vfwprintf.c
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Author :
yasuoka
Date : 2025-08-08 15:58:53
Hash : 9063a2f1
Message : Modify the FILE object's members. Bump the libc major. Now we can bump the short members _file and _flags to int and drop the SHRT_MAX tests. Reorder the members, merge __sfileext into the object, switch the *printf and *scanf families from _FILEEXT_SETUP() to the FILEINIT() initializer, and update the allocation code in findfp(). Also, delete the __sF, _srget, and __swbuf symbols that remain from the previous step for our transition. original diff from guenther, tweak by yasuoka ok sthen
- lib/libc/stdio/vfwprintf.c
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/* $OpenBSD: vfwprintf.c,v 1.25 2025/08/08 15:58:53 yasuoka 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. 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. */ /* * Actual wprintf innards. * * This code is large and complicated... */ #include <sys/types.h> #include <sys/mman.h> #include <errno.h> #include <langinfo.h> #include <limits.h> #include <stdarg.h> #include <stddef.h> #include <stdio.h> #include <stdint.h> #include <stdlib.h> #include <string.h> #include <syslog.h> #include <unistd.h> #include "local.h" #include "fvwrite.h" union arg { int intarg; unsigned int uintarg; long longarg; unsigned long ulongarg; long long longlongarg; unsigned long long ulonglongarg; ptrdiff_t ptrdiffarg; size_t sizearg; ssize_t ssizearg; intmax_t intmaxarg; uintmax_t uintmaxarg; void *pvoidarg; char *pchararg; signed char *pschararg; short *pshortarg; int *pintarg; long *plongarg; long long *plonglongarg; ptrdiff_t *pptrdiffarg; ssize_t *pssizearg; intmax_t *pintmaxarg; #ifdef FLOATING_POINT double doublearg; long double longdoublearg; #endif wint_t wintarg; wchar_t *pwchararg; }; static int __find_arguments(const wchar_t *fmt0, va_list ap, union arg **argtable, size_t *argtablesiz); static int __grow_type_table(unsigned char **typetable, int *tablesize); /* * 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(FILE *fp, const wchar_t *fmt, va_list ap) { int ret; FILE fake = FILEINIT(fp->_flags & ~__SNBF); unsigned char buf[BUFSIZ]; /* copy the important variables */ 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); /* do the work, then copy any error status */ ret = __vfwprintf(&fake, fmt, ap); if (ret >= 0 && __sflush(&fake)) ret = EOF; if (fake._flags & __SERR) fp->_flags |= __SERR; return (ret); } /* * Like __fputwc_unlock, but handles fake string (__SSTR) files properly. * File must already be locked. */ static wint_t __xfputwc(wchar_t wc, FILE *fp) { mbstate_t mbs; char buf[MB_LEN_MAX]; struct __suio uio; struct __siov iov; size_t len; if ((fp->_flags & __SSTR) == 0) return (__fputwc_unlock(wc, fp)); bzero(&mbs, sizeof(mbs)); len = wcrtomb(buf, wc, &mbs); if (len == (size_t)-1) { fp->_flags |= __SERR; errno = EILSEQ; return (WEOF); } uio.uio_iov = &iov; uio.uio_resid = len; uio.uio_iovcnt = 1; iov.iov_base = buf; iov.iov_len = len; return (__sfvwrite(fp, &uio) != EOF ? (wint_t)wc : WEOF); } /* * Convert a multibyte character string argument for the %s format to a wide * string representation. ``prec'' specifies the maximum number of bytes * to output. If ``prec'' is greater than or equal to zero, we can't assume * that the multibyte character string ends in a null character. * * Returns NULL on failure. * To find out what happened check errno for ENOMEM, EILSEQ and EINVAL. */ static wchar_t * __mbsconv(char *mbsarg, int prec) { mbstate_t mbs; wchar_t *convbuf, *wcp; const char *p; size_t insize, nchars, nconv; if (mbsarg == NULL) return (NULL); /* * Supplied argument is a multibyte string; convert it to wide * characters first. */ if (prec >= 0) { /* * String is not guaranteed to be NUL-terminated. Find the * number of characters to print. */ p = mbsarg; insize = nchars = nconv = 0; bzero(&mbs, sizeof(mbs)); while (nchars != (size_t)prec) { nconv = mbrlen(p, MB_CUR_MAX, &mbs); if (nconv == (size_t)0 || nconv == (size_t)-1 || nconv == (size_t)-2) break; p += nconv; nchars++; insize += nconv; } if (nconv == (size_t)-1 || nconv == (size_t)-2) return (NULL); } else insize = strlen(mbsarg); /* * Allocate buffer for the result and perform the conversion, * converting at most `size' bytes of the input multibyte string to * wide characters for printing. */ convbuf = calloc(insize + 1, sizeof(*convbuf)); if (convbuf == NULL) return (NULL); wcp = convbuf; p = mbsarg; bzero(&mbs, sizeof(mbs)); nconv = 0; while (insize != 0) { nconv = mbrtowc(wcp, p, insize, &mbs); if (nconv == 0 || nconv == (size_t)-1 || nconv == (size_t)-2) break; wcp++; p += nconv; insize -= nconv; } if (nconv == (size_t)-1 || nconv == (size_t)-2) { free(convbuf); return (NULL); } *wcp = '\0'; return (convbuf); } #ifdef FLOATING_POINT #include <float.h> #include <locale.h> #include <math.h> #include "floatio.h" #include "gdtoa.h" #define DEFPREC 6 static int exponent(wchar_t *, int, int); #endif /* FLOATING_POINT */ /* * The size of the buffer we use as scratch space for integer * conversions, among other things. Technically, we would need the * most space for base 10 conversions with thousands' grouping * characters between each pair of digits. 100 bytes is a * conservative overestimate even for a 128-bit uintmax_t. */ #define BUF 100 #define STATIC_ARG_TBL_SIZE 8 /* Size of static argument table. */ /* * 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) ((wchar_t)((n) + '0')) /* * Flags used during conversion. */ #define ALT 0x0001 /* alternate form */ #define LADJUST 0x0004 /* left adjustment */ #define LONGDBL 0x0008 /* long double */ #define LONGINT 0x0010 /* long integer */ #define LLONGINT 0x0020 /* long long integer */ #define SHORTINT 0x0040 /* short integer */ #define ZEROPAD 0x0080 /* zero (as opposed to blank) pad */ #define FPT 0x0100 /* Floating point number */ #define PTRINT 0x0200 /* (unsigned) ptrdiff_t */ #define SIZEINT 0x0400 /* (signed) size_t */ #define CHARINT 0x0800 /* 8 bit integer */ #define MAXINT 0x1000 /* largest integer size (intmax_t) */ int __vfwprintf(FILE * __restrict fp, const wchar_t * __restrict fmt0, __va_list ap) { wchar_t *fmt; /* format string */ wchar_t ch; /* character from fmt */ int n, n2, n3; /* handy integers (short term usage) */ wchar_t *cp; /* handy char pointer (short term usage) */ int flags; /* flags as above */ int ret; /* return value accumulator */ int width; /* width from format (%8d), or 0 */ int prec; /* precision from format; <0 for N/A */ wchar_t sign; /* sign prefix (' ', '+', '-', or \0) */ #ifdef FLOATING_POINT /* * We can decompose the printed representation of floating * point numbers into several parts, some of which may be empty: * * [+|-| ] [0x|0X] MMM . NNN [e|E|p|P] [+|-] ZZ * A B ---C--- D E F * * A: 'sign' holds this value if present; '\0' otherwise * B: ox[1] holds the 'x' or 'X'; '\0' if not hexadecimal * C: cp points to the string MMMNNN. Leading and trailing * zeros are not in the string and must be added. * D: expchar holds this character; '\0' if no exponent, e.g. %f * F: at least two digits for decimal, at least one digit for hex */ char *decimal_point = NULL; int signflag; /* true if float is negative */ union { /* floating point arguments %[aAeEfFgG] */ double dbl; long double ldbl; } fparg; int expt; /* integer value of exponent */ char expchar; /* exponent character: [eEpP\0] */ char *dtoaend; /* pointer to end of converted digits */ int expsize; /* character count for expstr */ int lead; /* sig figs before decimal or group sep */ int ndig; /* actual number of digits returned by dtoa */ wchar_t expstr[MAXEXPDIG+2]; /* buffer for exponent string: e+ZZZ */ char *dtoaresult = NULL; #endif uintmax_t _umax; /* 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 */ const char *xdigs; /* digits for %[xX] conversion */ wchar_t buf[BUF]; /* buffer with space for digits of uintmax_t */ wchar_t ox[2]; /* space for 0x; ox[1] is either x, X, or \0 */ union arg *argtable; /* args, built due to positional arg */ union arg statargtable[STATIC_ARG_TBL_SIZE]; size_t argtablesiz; int nextarg; /* 1-based argument index */ va_list orgap; /* original argument pointer */ wchar_t *convbuf; /* buffer for multibyte to wide conversion */ /* * 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 wchar_t blanks[PADSIZE] = {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '}; static wchar_t zeroes[PADSIZE] = {'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'}; static const char xdigs_lower[16] = "0123456789abcdef"; static const char xdigs_upper[16] = "0123456789ABCDEF"; /* * BEWARE, these `goto error' on error, PRINT uses 'n3', * PAD uses `n' and 'n3', and PRINTANDPAD uses 'n', 'n2', and 'n3'. */ #define PRINT(ptr, len) do { \ for (n3 = 0; n3 < (len); n3++) { \ if ((__xfputwc((ptr)[n3], fp)) == WEOF) \ goto error; \ } \ } while (0) #define PAD(howmany, with) do { \ if ((n = (howmany)) > 0) { \ while (n > PADSIZE) { \ PRINT(with, PADSIZE); \ n -= PADSIZE; \ } \ PRINT(with, n); \ } \ } while (0) #define PRINTANDPAD(p, ep, len, with) do { \ n2 = (ep) - (p); \ if (n2 > (len)) \ n2 = (len); \ if (n2 > 0) \ PRINT((p), n2); \ PAD((len) - (n2 > 0 ? n2 : 0), (with)); \ } while(0) /* * To extend shorts properly, we need both signed and unsigned * argument extraction methods. */ #define SARG() \ ((intmax_t)(flags&MAXINT ? GETARG(intmax_t) : \ flags&LLONGINT ? GETARG(long long) : \ flags&LONGINT ? GETARG(long) : \ flags&PTRINT ? GETARG(ptrdiff_t) : \ flags&SIZEINT ? GETARG(ssize_t) : \ flags&SHORTINT ? (short)GETARG(int) : \ flags&CHARINT ? (signed char)GETARG(int) : \ GETARG(int))) #define UARG() \ ((uintmax_t)(flags&MAXINT ? GETARG(uintmax_t) : \ flags&LLONGINT ? GETARG(unsigned long long) : \ flags&LONGINT ? GETARG(unsigned long) : \ flags&PTRINT ? (uintptr_t)GETARG(ptrdiff_t) : /* XXX */ \ flags&SIZEINT ? GETARG(size_t) : \ flags&SHORTINT ? (unsigned short)GETARG(int) : \ flags&CHARINT ? (unsigned char)GETARG(int) : \ GETARG(unsigned int))) /* * Append a digit to a value and check for overflow. */ #define APPEND_DIGIT(val, dig) do { \ if ((val) > INT_MAX / 10) \ goto overflow; \ (val) *= 10; \ if ((val) > INT_MAX - to_digit((dig))) \ goto overflow; \ (val) += to_digit((dig)); \ } while (0) /* * Get * arguments, including the form *nn$. Preserve the nextarg * that the argument can be gotten once the type is determined. */ #define GETASTER(val) \ n2 = 0; \ cp = fmt; \ while (is_digit(*cp)) { \ APPEND_DIGIT(n2, *cp); \ cp++; \ } \ if (*cp == '$') { \ int hold = nextarg; \ if (argtable == NULL) { \ argtable = statargtable; \ if (__find_arguments(fmt0, orgap, &argtable, \ &argtablesiz) == -1) { \ ret = -1; \ goto error; \ } \ } \ nextarg = n2; \ val = GETARG(int); \ nextarg = hold; \ fmt = ++cp; \ } else { \ val = GETARG(int); \ } /* * Get the argument indexed by nextarg. If the argument table is * built, use it to get the argument. If its not, get the next * argument (and arguments must be gotten sequentially). */ #define GETARG(type) \ ((argtable != NULL) ? *((type*)(&argtable[nextarg++])) : \ (nextarg++, va_arg(ap, type))) _SET_ORIENTATION(fp, 1); /* sorry, fwprintf(read_only_file, "") returns EOF, not 0 */ if (cantwrite(fp)) return (EOF); /* optimise fwprintf(stderr) (and other unbuffered Unix files) */ if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) && fp->_file >= 0) return (__sbprintf(fp, fmt0, ap)); fmt = (wchar_t *)fmt0; argtable = NULL; nextarg = 1; va_copy(orgap, ap); ret = 0; convbuf = NULL; /* * Scan the format for conversions (`%' character). */ for (;;) { for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++) continue; if (fmt != cp) { ptrdiff_t m = fmt - cp; if (m < 0 || m > INT_MAX - ret) goto overflow; PRINT(cp, m); ret += m; } if (ch == '\0') goto done; fmt++; /* skip over '%' */ flags = 0; dprec = 0; width = 0; prec = -1; sign = '\0'; ox[1] = '\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 '\'': /* grouping not implemented */ 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. */ GETASTER(width); if (width >= 0) goto rflag; if (width == INT_MIN) goto overflow; width = -width; /* FALLTHROUGH */ case '-': flags |= LADJUST; goto rflag; case '+': sign = '+'; goto rflag; case '.': if ((ch = *fmt++) == '*') { GETASTER(n); prec = n < 0 ? -1 : n; goto rflag; } n = 0; while (is_digit(ch)) { APPEND_DIGIT(n, ch); ch = *fmt++; } if (ch == '$') { nextarg = n; if (argtable == NULL) { argtable = statargtable; if (__find_arguments(fmt0, orgap, &argtable, &argtablesiz) == -1) { ret = -1; goto error; } } goto rflag; } prec = n; goto reswitch; case '0': /* * ``Note that 0 is taken as a flag, not as the * beginning of a field width.'' * -- ANSI X3J11 */ flags |= ZEROPAD; goto rflag; case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': n = 0; do { APPEND_DIGIT(n, ch); ch = *fmt++; } while (is_digit(ch)); if (ch == '$') { nextarg = n; if (argtable == NULL) { argtable = statargtable; if (__find_arguments(fmt0, orgap, &argtable, &argtablesiz) == -1) { ret = -1; goto error; } } goto rflag; } width = n; goto reswitch; #ifdef FLOATING_POINT case 'L': flags |= LONGDBL; goto rflag; #endif case 'h': if (*fmt == 'h') { fmt++; flags |= CHARINT; } else { flags |= SHORTINT; } goto rflag; case 'j': flags |= MAXINT; goto rflag; case 'l': if (*fmt == 'l') { fmt++; flags |= LLONGINT; } else { flags |= LONGINT; } goto rflag; case 'q': flags |= LLONGINT; goto rflag; case 't': flags |= PTRINT; goto rflag; case 'z': flags |= SIZEINT; goto rflag; case 'C': flags |= LONGINT; /*FALLTHROUGH*/ case 'c': if (flags & LONGINT) *(cp = buf) = (wchar_t)GETARG(wint_t); else *(cp = buf) = (wchar_t)btowc(GETARG(int)); size = 1; sign = '\0'; break; case 'D': flags |= LONGINT; /*FALLTHROUGH*/ case 'd': case 'i': _umax = SARG(); if ((intmax_t)_umax < 0) { _umax = -_umax; sign = '-'; } base = DEC; goto number; #ifdef FLOATING_POINT case 'a': case 'A': if (ch == 'a') { ox[1] = 'x'; xdigs = xdigs_lower; expchar = 'p'; } else { ox[1] = 'X'; xdigs = xdigs_upper; expchar = 'P'; } if (prec >= 0) prec++; if (dtoaresult) __freedtoa(dtoaresult); if (flags & LONGDBL) { fparg.ldbl = GETARG(long double); dtoaresult = __hldtoa(fparg.ldbl, xdigs, prec, &expt, &signflag, &dtoaend); if (dtoaresult == NULL) { errno = ENOMEM; goto error; } } else { fparg.dbl = GETARG(double); dtoaresult = __hdtoa(fparg.dbl, xdigs, prec, &expt, &signflag, &dtoaend); if (dtoaresult == NULL) { errno = ENOMEM; goto error; } } if (prec < 0) prec = dtoaend - dtoaresult; if (expt == INT_MAX) ox[1] = '\0'; free(convbuf); cp = convbuf = __mbsconv(dtoaresult, -1); if (cp == NULL) goto error; ndig = dtoaend - dtoaresult; goto fp_common; case 'e': case 'E': expchar = ch; if (prec < 0) /* account for digit before decpt */ prec = DEFPREC + 1; else prec++; goto fp_begin; case 'f': case 'F': expchar = '\0'; goto fp_begin; case 'g': case 'G': expchar = ch - ('g' - 'e'); if (prec == 0) prec = 1; fp_begin: if (prec < 0) prec = DEFPREC; if (dtoaresult) __freedtoa(dtoaresult); if (flags & LONGDBL) { fparg.ldbl = GETARG(long double); dtoaresult = __ldtoa(&fparg.ldbl, expchar ? 2 : 3, prec, &expt, &signflag, &dtoaend); if (dtoaresult == NULL) { errno = ENOMEM; goto error; } } else { fparg.dbl = GETARG(double); dtoaresult = __dtoa(fparg.dbl, expchar ? 2 : 3, prec, &expt, &signflag, &dtoaend); if (dtoaresult == NULL) { errno = ENOMEM; goto error; } if (expt == 9999) expt = INT_MAX; } free(convbuf); cp = convbuf = __mbsconv(dtoaresult, -1); if (cp == NULL) goto error; ndig = dtoaend - dtoaresult; fp_common: if (signflag) sign = '-'; if (expt == INT_MAX) { /* inf or nan */ if (*cp == 'N') cp = (ch >= 'a') ? L"nan" : L"NAN"; else cp = (ch >= 'a') ? L"inf" : L"INF"; size = 3; flags &= ~ZEROPAD; break; } flags |= FPT; if (ch == 'g' || ch == 'G') { if (expt > -4 && expt <= prec) { /* Make %[gG] smell like %[fF] */ expchar = '\0'; if (flags & ALT) prec -= expt; else prec = ndig - expt; if (prec < 0) prec = 0; } else { /* * Make %[gG] smell like %[eE], but * trim trailing zeroes if no # flag. */ if (!(flags & ALT)) prec = ndig; } } if (expchar) { expsize = exponent(expstr, expt - 1, expchar); size = expsize + prec; if (prec > 1 || flags & ALT) ++size; } else { /* space for digits before decimal point */ if (expt > 0) size = expt; else /* "0" */ size = 1; /* space for decimal pt and following digits */ if (prec || flags & ALT) size += prec + 1; lead = expt; } break; #endif /* FLOATING_POINT */ case 'n': { static const char n_msg[] = ": *wprintf used %n, aborting"; char buf[1024], *p; /* <10> is LOG_CRIT */ strlcpy(buf, "<10>", sizeof buf); /* Make sure progname does not fill the whole buffer */ strlcat(buf, __progname, sizeof(buf) - sizeof n_msg); strlcat(buf, n_msg, sizeof buf); /* * vfprintf sends fmt0 via syslog, but this is not * good behaviour for wide strings. */ if ((p = strchr(buf, '\n'))) *p = '\0'; sendsyslog(buf, strlen(buf), LOG_CONS); abort(); break; } case 'O': flags |= LONGINT; /*FALLTHROUGH*/ case 'o': _umax = 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 */ _umax = (u_long)GETARG(void *); base = HEX; xdigs = xdigs_lower; ox[1] = 'x'; goto nosign; case 'S': flags |= LONGINT; /*FALLTHROUGH*/ case 's': if (flags & LONGINT) { if ((cp = GETARG(wchar_t *)) == NULL) { struct syslog_data sdata = SYSLOG_DATA_INIT; int save_errno = errno; syslog_r(LOG_CRIT | LOG_CONS, &sdata, "vfwprintf %%ls NULL in \"%ls\"", fmt0); errno = save_errno; cp = L"(null)"; } } else { char *mbsarg; if ((mbsarg = GETARG(char *)) == NULL) { struct syslog_data sdata = SYSLOG_DATA_INIT; int save_errno = errno; syslog_r(LOG_CRIT | LOG_CONS, &sdata, "vfwprintf %%s NULL in \"%ls\"", fmt0); errno = save_errno; mbsarg = "(null)"; } free(convbuf); convbuf = __mbsconv(mbsarg, prec); if (convbuf == NULL) { fp->_flags |= __SERR; goto error; } else cp = convbuf; } if (prec >= 0) { /* * can't use wcslen; can only look for the * NUL in the first `prec' characters, and * wcslen() will go further. */ wchar_t *p = wmemchr(cp, 0, prec); size = p ? (p - cp) : prec; } else { size_t len; if ((len = wcslen(cp)) > INT_MAX) goto overflow; size = (int)len; } sign = '\0'; break; case 'U': flags |= LONGINT; /*FALLTHROUGH*/ case 'u': _umax = UARG(); base = DEC; goto nosign; case 'X': xdigs = xdigs_upper; goto hex; case 'x': xdigs = xdigs_lower; hex: _umax = UARG(); base = HEX; /* leading 0x/X only if non-zero */ if (flags & ALT && _umax != 0) ox[1] = ch; /* 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 (_umax != 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(_umax & 7); _umax >>= 3; } while (_umax); /* handle octal leading 0 */ if (flags & ALT && *cp != '0') *--cp = '0'; break; case DEC: /* many numbers are 1 digit */ while (_umax >= 10) { *--cp = to_char(_umax % 10); _umax /= 10; } *--cp = to_char(_umax); break; case HEX: do { *--cp = xdigs[_umax & 15]; _umax >>= 4; } while (_umax); break; default: cp = L"bug in vfwprintf: bad base"; size = wcslen(cp); goto skipsize; } } size = buf + BUF - cp; if (size > BUF) /* should never happen */ abort(); 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. * size excludes decimal prec; realsz includes it. */ realsz = dprec > size ? dprec : size; if (sign) realsz++; if (ox[1]) realsz+= 2; /* right-adjusting blank padding */ if ((flags & (LADJUST|ZEROPAD)) == 0) PAD(width - realsz, blanks); /* prefix */ if (sign) PRINT(&sign, 1); if (ox[1]) { /* ox[1] is either x, X, or \0 */ ox[0] = '0'; 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 (decimal_point == NULL) decimal_point = nl_langinfo(RADIXCHAR); if (!expchar) { /* %[fF] or sufficiently short %[gG] */ if (expt <= 0) { PRINT(zeroes, 1); if (prec || flags & ALT) PRINT(decimal_point, 1); PAD(-expt, zeroes); /* already handled initial 0's */ prec += expt; } else { PRINTANDPAD(cp, convbuf + ndig, lead, zeroes); cp += lead; if (prec || flags & ALT) PRINT(decimal_point, 1); } PRINTANDPAD(cp, convbuf + ndig, prec, zeroes); } else { /* %[eE] or sufficiently long %[gG] */ if (prec > 1 || flags & ALT) { buf[0] = *cp++; buf[1] = *decimal_point; PRINT(buf, 2); PRINT(cp, ndig-1); PAD(prec - ndig, 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 */ if (width < realsz) width = realsz; if (width > INT_MAX - ret) goto overflow; ret += width; } done: error: va_end(orgap); if (__sferror(fp)) ret = -1; goto finish; overflow: errno = EOVERFLOW; ret = -1; finish: free(convbuf); #ifdef FLOATING_POINT if (dtoaresult) __freedtoa(dtoaresult); #endif if (argtable != NULL && argtable != statargtable) { munmap(argtable, argtablesiz); argtable = NULL; } return (ret); } int vfwprintf(FILE * __restrict fp, const wchar_t * __restrict fmt0, __va_list ap) { int r; FLOCKFILE(fp); r = __vfwprintf(fp, fmt0, ap); FUNLOCKFILE(fp); return (r); } DEF_STRONG(vfwprintf); /* * Type ids for argument type table. */ #define T_UNUSED 0 #define T_SHORT 1 #define T_U_SHORT 2 #define TP_SHORT 3 #define T_INT 4 #define T_U_INT 5 #define TP_INT 6 #define T_LONG 7 #define T_U_LONG 8 #define TP_LONG 9 #define T_LLONG 10 #define T_U_LLONG 11 #define TP_LLONG 12 #define T_DOUBLE 13 #define T_LONG_DOUBLE 14 #define TP_CHAR 15 #define TP_VOID 16 #define T_PTRINT 17 #define TP_PTRINT 18 #define T_SIZEINT 19 #define T_SSIZEINT 20 #define TP_SSIZEINT 21 #define T_MAXINT 22 #define T_MAXUINT 23 #define TP_MAXINT 24 #define T_CHAR 25 #define T_U_CHAR 26 #define T_WINT 27 #define TP_WCHAR 28 /* * Find all arguments when a positional parameter is encountered. Returns a * table, indexed by argument number, of pointers to each arguments. The * initial argument table should be an array of STATIC_ARG_TBL_SIZE entries. * It will be replaced with a mmap-ed one if it overflows (malloc cannot be * used since we are attempting to make snprintf thread safe, and alloca is * problematic since we have nested functions..) */ static int __find_arguments(const wchar_t *fmt0, va_list ap, union arg **argtable, size_t *argtablesiz) { wchar_t *fmt; /* format string */ int ch; /* character from fmt */ int n, n2; /* handy integer (short term usage) */ wchar_t *cp; /* handy char pointer (short term usage) */ int flags; /* flags as above */ unsigned char *typetable; /* table of types */ unsigned char stattypetable[STATIC_ARG_TBL_SIZE]; int tablesize; /* current size of type table */ int tablemax; /* largest used index in table */ int nextarg; /* 1-based argument index */ int ret = 0; /* return value */ /* * Add an argument type to the table, expanding if necessary. */ #define ADDTYPE(type) \ ((nextarg >= tablesize) ? \ __grow_type_table(&typetable, &tablesize) : 0, \ (nextarg > tablemax) ? tablemax = nextarg : 0, \ typetable[nextarg++] = type) #define ADDSARG() \ ((flags&MAXINT) ? ADDTYPE(T_MAXINT) : \ ((flags&PTRINT) ? ADDTYPE(T_PTRINT) : \ ((flags&SIZEINT) ? ADDTYPE(T_SSIZEINT) : \ ((flags&LLONGINT) ? ADDTYPE(T_LLONG) : \ ((flags&LONGINT) ? ADDTYPE(T_LONG) : \ ((flags&SHORTINT) ? ADDTYPE(T_SHORT) : \ ((flags&CHARINT) ? ADDTYPE(T_CHAR) : ADDTYPE(T_INT)))))))) #define ADDUARG() \ ((flags&MAXINT) ? ADDTYPE(T_MAXUINT) : \ ((flags&PTRINT) ? ADDTYPE(T_PTRINT) : \ ((flags&SIZEINT) ? ADDTYPE(T_SIZEINT) : \ ((flags&LLONGINT) ? ADDTYPE(T_U_LLONG) : \ ((flags&LONGINT) ? ADDTYPE(T_U_LONG) : \ ((flags&SHORTINT) ? ADDTYPE(T_U_SHORT) : \ ((flags&CHARINT) ? ADDTYPE(T_U_CHAR) : ADDTYPE(T_U_INT)))))))) /* * Add * arguments to the type array. */ #define ADDASTER() \ n2 = 0; \ cp = fmt; \ while (is_digit(*cp)) { \ APPEND_DIGIT(n2, *cp); \ cp++; \ } \ if (*cp == '$') { \ int hold = nextarg; \ nextarg = n2; \ ADDTYPE(T_INT); \ nextarg = hold; \ fmt = ++cp; \ } else { \ ADDTYPE(T_INT); \ } fmt = (wchar_t *)fmt0; typetable = stattypetable; tablesize = STATIC_ARG_TBL_SIZE; tablemax = 0; nextarg = 1; memset(typetable, T_UNUSED, STATIC_ARG_TBL_SIZE); /* * Scan the format for conversions (`%' character). */ for (;;) { for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++) continue; if (ch == '\0') goto done; fmt++; /* skip over '%' */ flags = 0; rflag: ch = *fmt++; reswitch: switch (ch) { case ' ': case '#': case '\'': goto rflag; case '*': ADDASTER(); goto rflag; case '-': case '+': goto rflag; case '.': if ((ch = *fmt++) == '*') { ADDASTER(); goto rflag; } while (is_digit(ch)) { ch = *fmt++; } goto reswitch; case '0': goto rflag; case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': n = 0; do { APPEND_DIGIT(n ,ch); ch = *fmt++; } while (is_digit(ch)); if (ch == '$') { nextarg = n; goto rflag; } goto reswitch; #ifdef FLOATING_POINT case 'L': flags |= LONGDBL; goto rflag; #endif case 'h': if (*fmt == 'h') { fmt++; flags |= CHARINT; } else { flags |= SHORTINT; } goto rflag; case 'l': if (*fmt == 'l') { fmt++; flags |= LLONGINT; } else { flags |= LONGINT; } goto rflag; case 'q': flags |= LLONGINT; goto rflag; case 't': flags |= PTRINT; goto rflag; case 'z': flags |= SIZEINT; goto rflag; case 'C': flags |= LONGINT; /*FALLTHROUGH*/ case 'c': if (flags & LONGINT) ADDTYPE(T_WINT); else ADDTYPE(T_INT); break; case 'D': flags |= LONGINT; /*FALLTHROUGH*/ case 'd': case 'i': ADDSARG(); break; #ifdef FLOATING_POINT case 'a': case 'A': case 'e': case 'E': case 'f': case 'F': case 'g': case 'G': if (flags & LONGDBL) ADDTYPE(T_LONG_DOUBLE); else ADDTYPE(T_DOUBLE); break; #endif /* FLOATING_POINT */ case 'n': if (flags & LLONGINT) ADDTYPE(TP_LLONG); else if (flags & LONGINT) ADDTYPE(TP_LONG); else if (flags & SHORTINT) ADDTYPE(TP_SHORT); else if (flags & PTRINT) ADDTYPE(TP_PTRINT); else if (flags & SIZEINT) ADDTYPE(TP_SSIZEINT); else if (flags & MAXINT) ADDTYPE(TP_MAXINT); else ADDTYPE(TP_INT); continue; /* no output */ case 'O': flags |= LONGINT; /*FALLTHROUGH*/ case 'o': ADDUARG(); break; case 'p': ADDTYPE(TP_VOID); break; case 'S': flags |= LONGINT; /*FALLTHROUGH*/ case 's': if (flags & LONGINT) ADDTYPE(TP_CHAR); else ADDTYPE(TP_WCHAR); break; case 'U': flags |= LONGINT; /*FALLTHROUGH*/ case 'u': case 'X': case 'x': ADDUARG(); break; default: /* "%?" prints ?, unless ? is NUL */ if (ch == '\0') goto done; break; } } done: /* * Build the argument table. */ if (tablemax >= STATIC_ARG_TBL_SIZE) { *argtablesiz = sizeof(union arg) * (tablemax + 1); *argtable = mmap(NULL, *argtablesiz, PROT_WRITE|PROT_READ, MAP_ANON|MAP_PRIVATE, -1, 0); if (*argtable == MAP_FAILED) return (-1); } #if 0 /* XXX is this required? */ (*argtable)[0].intarg = 0; #endif for (n = 1; n <= tablemax; n++) { switch (typetable[n]) { case T_UNUSED: case T_CHAR: case T_U_CHAR: case T_SHORT: case T_U_SHORT: case T_INT: (*argtable)[n].intarg = va_arg(ap, int); break; case TP_SHORT: (*argtable)[n].pshortarg = va_arg(ap, short *); break; case T_U_INT: (*argtable)[n].uintarg = va_arg(ap, unsigned int); break; case TP_INT: (*argtable)[n].pintarg = va_arg(ap, int *); break; case T_LONG: (*argtable)[n].longarg = va_arg(ap, long); break; case T_U_LONG: (*argtable)[n].ulongarg = va_arg(ap, unsigned long); break; case TP_LONG: (*argtable)[n].plongarg = va_arg(ap, long *); break; case T_LLONG: (*argtable)[n].longlongarg = va_arg(ap, long long); break; case T_U_LLONG: (*argtable)[n].ulonglongarg = va_arg(ap, unsigned long long); break; case TP_LLONG: (*argtable)[n].plonglongarg = va_arg(ap, long long *); break; #ifdef FLOATING_POINT case T_DOUBLE: (*argtable)[n].doublearg = va_arg(ap, double); break; case T_LONG_DOUBLE: (*argtable)[n].longdoublearg = va_arg(ap, long double); break; #endif case TP_CHAR: (*argtable)[n].pchararg = va_arg(ap, char *); break; case TP_VOID: (*argtable)[n].pvoidarg = va_arg(ap, void *); break; case T_PTRINT: (*argtable)[n].ptrdiffarg = va_arg(ap, ptrdiff_t); break; case TP_PTRINT: (*argtable)[n].pptrdiffarg = va_arg(ap, ptrdiff_t *); break; case T_SIZEINT: (*argtable)[n].sizearg = va_arg(ap, size_t); break; case T_SSIZEINT: (*argtable)[n].ssizearg = va_arg(ap, ssize_t); break; case TP_SSIZEINT: (*argtable)[n].pssizearg = va_arg(ap, ssize_t *); break; case TP_MAXINT: (*argtable)[n].intmaxarg = va_arg(ap, intmax_t); break; case T_WINT: (*argtable)[n].wintarg = va_arg(ap, wint_t); break; case TP_WCHAR: (*argtable)[n].pwchararg = va_arg(ap, wchar_t *); break; } } goto finish; overflow: errno = EOVERFLOW; ret = -1; finish: if (typetable != NULL && typetable != stattypetable) { munmap(typetable, *argtablesiz); typetable = NULL; } return (ret); } /* * Increase the size of the type table. */ static int __grow_type_table(unsigned char **typetable, int *tablesize) { unsigned char *oldtable = *typetable; int newsize = *tablesize * 2; if (newsize < getpagesize()) newsize = getpagesize(); if (*tablesize == STATIC_ARG_TBL_SIZE) { *typetable = mmap(NULL, newsize, PROT_WRITE|PROT_READ, MAP_ANON|MAP_PRIVATE, -1, 0); if (*typetable == MAP_FAILED) return (-1); bcopy(oldtable, *typetable, *tablesize); } else { unsigned char *new = mmap(NULL, newsize, PROT_WRITE|PROT_READ, MAP_ANON|MAP_PRIVATE, -1, 0); if (new == MAP_FAILED) return (-1); memmove(new, *typetable, *tablesize); munmap(*typetable, *tablesize); *typetable = new; } memset(*typetable + *tablesize, T_UNUSED, (newsize - *tablesize)); *tablesize = newsize; return (0); } #ifdef FLOATING_POINT static int exponent(wchar_t *p0, int exp, int fmtch) { wchar_t *p, *t; wchar_t expbuf[MAXEXPDIG]; p = p0; *p++ = fmtch; if (exp < 0) { exp = -exp; *p++ = '-'; } else *p++ = '+'; t = expbuf + MAXEXPDIG; if (exp > 9) { do { *--t = to_char(exp % 10); } while ((exp /= 10) > 9); *--t = to_char(exp); for (; t < expbuf + MAXEXPDIG; *p++ = *t++) /* nothing */; } else { /* * Exponents for decimal floating point conversions * (%[eEgG]) must be at least two characters long, * whereas exponents for hexadecimal conversions can * be only one character long. */ if (fmtch == 'e' || fmtch == 'E') *p++ = '0'; *p++ = to_char(exp); } return (p - p0); } #endif /* FLOATING_POINT */