/*- * Copyright (c) 1990, 1993 * 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 0 #if defined(LIBC_SCCS) && !defined(lint) static char sccsid[] = "@(#)vfscanf.c 8.1 (Berkeley) 6/4/93"; #endif /* LIBC_SCCS and not lint */ __FBSDID("FreeBSD: src/lib/libc/stdio/vfscanf.c,v 1.24 2002/08/13 09:30:41 tjr Exp "); #endif __FBSDID("$FreeBSD$"); #include "namespace.h" #include #include #include #include #include #include #include #include #include #include "un-namespace.h" #include "libc_private.h" #include "local.h" #define FLOATING_POINT #ifdef FLOATING_POINT #include #include "floatio.h" #endif #define BUF 513 /* Maximum length of numeric string. */ /* * Flags used during conversion. */ #define LONG 0x01 /* l: long or double */ #define LONGDBL 0x02 /* L: long double */ #define SHORT 0x04 /* h: short */ #define SUPPRESS 0x08 /* *: suppress assignment */ #define POINTER 0x10 /* p: void * (as hex) */ #define NOSKIP 0x20 /* [ or c: do not skip blanks */ #define LONGLONG 0x400 /* ll: long long (+ deprecated q: quad) */ #define INTMAXT 0x800 /* j: intmax_t */ #define PTRDIFFT 0x1000 /* t: ptrdiff_t */ #define SIZET 0x2000 /* z: size_t */ #define SHORTSHORT 0x4000 /* hh: char */ #define UNSIGNED 0x8000 /* %[oupxX] conversions */ /* * The following are used in numeric conversions only: * SIGNOK, NDIGITS, DPTOK, and EXPOK are for floating point; * SIGNOK, NDIGITS, PFXOK, and NZDIGITS are for integral. */ #define SIGNOK 0x40 /* +/- is (still) legal */ #define NDIGITS 0x80 /* no digits detected */ #define DPTOK 0x100 /* (float) decimal point is still legal */ #define EXPOK 0x200 /* (float) exponent (e+3, etc) still legal */ #define PFXOK 0x100 /* 0x prefix is (still) legal */ #define NZDIGITS 0x200 /* no zero digits detected */ /* * Conversion types. */ #define CT_CHAR 0 /* %c conversion */ #define CT_CCL 1 /* %[...] conversion */ #define CT_STRING 2 /* %s conversion */ #define CT_INT 3 /* %[dioupxX] conversion */ #define CT_FLOAT 4 /* %[efgEFG] conversion */ #define INCCL(_c) \ (cclcompl ? (wmemchr(ccls, (_c), ccle - ccls) == NULL) : \ (wmemchr(ccls, (_c), ccle - ccls) != NULL)) /* * MT-safe version. */ int vfwscanf(FILE * __restrict fp, const wchar_t * __restrict fmt, va_list ap) { int ret; FLOCKFILE(fp); ORIENT(fp, 1); ret = __vfwscanf(fp, fmt, ap); FUNLOCKFILE(fp); return (ret); } /* * Non-MT-safe version. */ int __vfwscanf(FILE * __restrict fp, const wchar_t * __restrict fmt, va_list ap) { wint_t c; /* character from format, or conversion */ size_t width; /* field width, or 0 */ wchar_t *p; /* points into all kinds of strings */ int n; /* handy integer */ int flags; /* flags as defined above */ wchar_t *p0; /* saves original value of p when necessary */ int nassigned; /* number of fields assigned */ int nconversions; /* number of conversions */ int nread; /* number of characters consumed from fp */ int base; /* base argument to conversion function */ wchar_t buf[BUF]; /* buffer for numeric conversions */ const wchar_t *ccls; /* character class start */ const wchar_t *ccle; /* character class end */ int cclcompl; /* ccl is complemented? */ wint_t wi; /* handy wint_t */ char *mbp; /* multibyte string pointer for %c %s %[ */ size_t nconv; /* number of bytes in mb. conversion */ mbstate_t mbs; /* multibyte state */ char mbbuf[MB_LEN_MAX]; /* temporary mb. character buffer */ /* `basefix' is used to avoid `if' tests in the integer scanner */ static short basefix[17] = { 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 }; #ifdef FLOATING_POINT char decimal_point = localeconv()->decimal_point[0]; #endif nassigned = 0; nconversions = 0; nread = 0; ccls = ccle = NULL; for (;;) { c = *fmt++; if (c == 0) return (nassigned); if (iswspace(c)) { while ((c = __fgetwc(fp)) != WEOF && iswspace(c)) ; if (c != WEOF) __ungetwc(c, fp); continue; } if (c != '%') goto literal; width = 0; flags = 0; /* * switch on the format. continue if done; * break once format type is derived. */ again: c = *fmt++; switch (c) { case '%': literal: if ((wi = __fgetwc(fp)) == WEOF) goto input_failure; if (wi != c) { __ungetwc(wi, fp); goto input_failure; } nread++; continue; case '*': flags |= SUPPRESS; goto again; case 'j': flags |= INTMAXT; goto again; case 'l': if (flags & LONG) { flags &= ~LONG; flags |= LONGLONG; } else flags |= LONG; goto again; case 'q': flags |= LONGLONG; /* not quite */ goto again; case 't': flags |= PTRDIFFT; goto again; case 'z': flags |= SIZET; goto again; case 'L': flags |= LONGDBL; goto again; case 'h': if (flags & SHORT) { flags &= ~SHORT; flags |= SHORTSHORT; } else flags |= SHORT; goto again; case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': width = width * 10 + c - '0'; goto again; /* * Conversions. */ case 'd': c = CT_INT; base = 10; break; case 'i': c = CT_INT; base = 0; break; case 'o': c = CT_INT; flags |= UNSIGNED; base = 8; break; case 'u': c = CT_INT; flags |= UNSIGNED; base = 10; break; case 'X': case 'x': flags |= PFXOK; /* enable 0x prefixing */ c = CT_INT; flags |= UNSIGNED; base = 16; break; #ifdef FLOATING_POINT case 'E': case 'F': case 'G': case 'e': case 'f': case 'g': c = CT_FLOAT; break; #endif case 'S': flags |= LONG; /* FALLTHROUGH */ case 's': c = CT_STRING; break; case '[': ccls = fmt; if (*fmt == '^') { cclcompl = 1; fmt++; } else cclcompl = 0; if (*fmt == ']') fmt++; while (*fmt != '\0' && *fmt != ']') fmt++; ccle = fmt; fmt++; flags |= NOSKIP; c = CT_CCL; break; case 'C': flags |= LONG; /* FALLTHROUGH */ case 'c': flags |= NOSKIP; c = CT_CHAR; break; case 'p': /* pointer format is like hex */ flags |= POINTER | PFXOK; c = CT_INT; /* assumes sizeof(uintmax_t) */ flags |= UNSIGNED; /* >= sizeof(uintptr_t) */ base = 16; break; case 'n': nconversions++; if (flags & SUPPRESS) /* ??? */ continue; if (flags & SHORTSHORT) *va_arg(ap, char *) = nread; else if (flags & SHORT) *va_arg(ap, short *) = nread; else if (flags & LONG) *va_arg(ap, long *) = nread; else if (flags & LONGLONG) *va_arg(ap, long long *) = nread; else if (flags & INTMAXT) *va_arg(ap, intmax_t *) = nread; else if (flags & SIZET) *va_arg(ap, size_t *) = nread; else if (flags & PTRDIFFT) *va_arg(ap, ptrdiff_t *) = nread; else *va_arg(ap, int *) = nread; continue; default: goto match_failure; /* * Disgusting backwards compatibility hack. XXX */ case '\0': /* compat */ return (EOF); } /* * Consume leading white space, except for formats * that suppress this. */ if ((flags & NOSKIP) == 0) { while ((wi = __fgetwc(fp)) != WEOF && iswspace(wi)) nread++; if (wi == WEOF) goto input_failure; __ungetwc(wi, fp); } /* * Do the conversion. */ switch (c) { case CT_CHAR: /* scan arbitrary characters (sets NOSKIP) */ if (width == 0) width = 1; if (flags & LONG) { if (!(flags & SUPPRESS)) p = va_arg(ap, wchar_t *); n = 0; while (width-- != 0 && (wi = __fgetwc(fp)) != WEOF) { if (!(flags & SUPPRESS)) *p++ = (wchar_t)wi; n++; } if (n == 0) goto input_failure; nread += n; if (!(flags & SUPPRESS)) nassigned++; } else { if (!(flags & SUPPRESS)) mbp = va_arg(ap, char *); n = 0; memset(&mbs, 0, sizeof(mbs)); while (width != 0 && (wi = __fgetwc(fp)) != WEOF) { if (width >= MB_CUR_MAX && !(flags & SUPPRESS)) { nconv = wcrtomb(mbp, wi, &mbs); if (nconv == (size_t)-1) goto input_failure; } else { nconv = wcrtomb(mbbuf, wi, &mbs); if (nconv == (size_t)-1) goto input_failure; if (nconv > width) { __ungetwc(wi, fp); break; } if (!(flags & SUPPRESS)) memcpy(mbp, mbbuf, nconv); } if (!(flags & SUPPRESS)) mbp += nconv; width -= nconv; n++; } if (n == 0) goto input_failure; nread += n; if (!(flags & SUPPRESS)) nassigned++; } nconversions++; break; case CT_CCL: /* scan a (nonempty) character class (sets NOSKIP) */ if (width == 0) width = (size_t)~0; /* `infinity' */ /* take only those things in the class */ if ((flags & SUPPRESS) && (flags & LONG)) { n = 0; while ((wi = __fgetwc(fp)) != WEOF && width-- != 0 && INCCL(wi)) n++; if (wi != WEOF) __ungetwc(wi, fp); if (n == 0) goto match_failure; } else if (flags & LONG) { p0 = p = va_arg(ap, wchar_t *); while ((wi = __fgetwc(fp)) != WEOF && width-- != 0 && INCCL(wi)) *p++ = (wchar_t)wi; if (wi != WEOF) __ungetwc(wi, fp); n = p - p0; if (n == 0) goto match_failure; *p = 0; nassigned++; } else { if (!(flags & SUPPRESS)) mbp = va_arg(ap, char *); n = 0; memset(&mbs, 0, sizeof(mbs)); while ((wi = __fgetwc(fp)) != WEOF && width != 0 && INCCL(wi)) { if (width >= MB_CUR_MAX && !(flags & SUPPRESS)) { nconv = wcrtomb(mbp, wi, &mbs); if (nconv == (size_t)-1) goto input_failure; } else { nconv = wcrtomb(mbbuf, wi, &mbs); if (nconv == (size_t)-1) goto input_failure; if (nconv > width) break; if (!(flags & SUPPRESS)) memcpy(mbp, mbbuf, nconv); } if (!(flags & SUPPRESS)) mbp += nconv; width -= nconv; n++; } if (wi != WEOF) __ungetwc(wi, fp); if (!(flags & SUPPRESS)) { *mbp = 0; nassigned++; } } nread += n; nconversions++; break; case CT_STRING: /* like CCL, but zero-length string OK, & no NOSKIP */ if (width == 0) width = (size_t)~0; if ((flags & SUPPRESS) && (flags & LONG)) { while ((wi = __fgetwc(fp)) != WEOF && width-- != 0 && !iswspace(wi)) nread++; if (wi != WEOF) __ungetwc(wi, fp); } else if (flags & LONG) { p0 = p = va_arg(ap, wchar_t *); while ((wi = __fgetwc(fp)) != WEOF && width-- != 0 && !iswspace(wi)) { *p++ = (wchar_t)wi; nread++; } if (wi != WEOF) __ungetwc(wi, fp); *p = '\0'; nassigned++; } else { if (!(flags & SUPPRESS)) mbp = va_arg(ap, char *); memset(&mbs, 0, sizeof(mbs)); while ((wi = __fgetwc(fp)) != WEOF && width != 0 && !iswspace(wi)) { if (width >= MB_CUR_MAX && !(flags & SUPPRESS)) { nconv = wcrtomb(mbp, wi, &mbs); if (nconv == (size_t)-1) goto input_failure; } else { nconv = wcrtomb(mbbuf, wi, &mbs); if (nconv == (size_t)-1) goto input_failure; if (nconv > width) break; if (!(flags & SUPPRESS)) memcpy(mbp, mbbuf, nconv); } if (!(flags & SUPPRESS)) mbp += nconv; width -= nconv; nread++; } if (wi != WEOF) __ungetwc(wi, fp); if (!(flags & SUPPRESS)) { *mbp = 0; nassigned++; } } nconversions++; continue; case CT_INT: /* scan an integer as if by the conversion function */ #ifdef hardway if (width == 0 || width > sizeof(buf) - 1) width = sizeof(buf) - 1; #else /* size_t is unsigned, hence this optimisation */ if (--width > sizeof(buf) - 2) width = sizeof(buf) - 2; width++; #endif flags |= SIGNOK | NDIGITS | NZDIGITS; for (p = buf; width; width--) { c = __fgetwc(fp); /* * Switch on the character; `goto ok' * if we accept it as a part of number. */ switch (c) { /* * The digit 0 is always legal, but is * special. For %i conversions, if no * digits (zero or nonzero) have been * scanned (only signs), we will have * base==0. In that case, we should set * it to 8 and enable 0x prefixing. * Also, if we have not scanned zero digits * before this, do not turn off prefixing * (someone else will turn it off if we * have scanned any nonzero digits). */ case '0': if (base == 0) { base = 8; flags |= PFXOK; } if (flags & NZDIGITS) flags &= ~(SIGNOK|NZDIGITS|NDIGITS); else flags &= ~(SIGNOK|PFXOK|NDIGITS); goto ok; /* 1 through 7 always legal */ case '1': case '2': case '3': case '4': case '5': case '6': case '7': base = basefix[base]; flags &= ~(SIGNOK | PFXOK | NDIGITS); goto ok; /* digits 8 and 9 ok iff decimal or hex */ case '8': case '9': base = basefix[base]; if (base <= 8) break; /* not legal here */ flags &= ~(SIGNOK | PFXOK | NDIGITS); goto ok; /* letters ok iff hex */ case 'A': case 'B': case 'C': case 'D': case 'E': case 'F': case 'a': case 'b': case 'c': case 'd': case 'e': case 'f': /* no need to fix base here */ if (base <= 10) break; /* not legal here */ flags &= ~(SIGNOK | PFXOK | NDIGITS); goto ok; /* sign ok only as first character */ case '+': case '-': if (flags & SIGNOK) { flags &= ~SIGNOK; goto ok; } break; /* x ok iff flag still set & 2nd char */ case 'x': case 'X': if (flags & PFXOK && p == buf + 1) { base = 16; /* if %i */ flags &= ~PFXOK; goto ok; } break; } /* * If we got here, c is not a legal character * for a number. Stop accumulating digits. */ if (c != WEOF) __ungetwc(c, fp); break; ok: /* * c is legal: store it and look at the next. */ *p++ = (wchar_t)c; } /* * If we had only a sign, it is no good; push * back the sign. If the number ends in `x', * it was [sign] '0' 'x', so push back the x * and treat it as [sign] '0'. */ if (flags & NDIGITS) { if (p > buf) __ungetwc(*--p, fp); goto match_failure; } c = p[-1]; if (c == 'x' || c == 'X') { --p; __ungetwc(c, fp); } if ((flags & SUPPRESS) == 0) { uintmax_t res; *p = 0; if ((flags & UNSIGNED) == 0) res = wcstoimax(buf, NULL, base); else res = wcstoumax(buf, NULL, base); if (flags & POINTER) *va_arg(ap, void **) = (void *)(uintptr_t)res; else if (flags & SHORTSHORT) *va_arg(ap, char *) = res; else if (flags & SHORT) *va_arg(ap, short *) = res; else if (flags & LONG) *va_arg(ap, long *) = res; else if (flags & LONGLONG) *va_arg(ap, long long *) = res; else if (flags & INTMAXT) *va_arg(ap, intmax_t *) = res; else if (flags & PTRDIFFT) *va_arg(ap, ptrdiff_t *) = res; else if (flags & SIZET) *va_arg(ap, size_t *) = res; else *va_arg(ap, int *) = res; nassigned++; } nread += p - buf; nconversions++; break; #ifdef FLOATING_POINT case CT_FLOAT: /* scan a floating point number as if by strtod */ #ifdef hardway if (width == 0 || width > sizeof(buf) - 1) width = sizeof(buf) - 1; #else /* size_t is unsigned, hence this optimisation */ if (--width > sizeof(buf) - 2) width = sizeof(buf) - 2; width++; #endif flags |= SIGNOK | NDIGITS | DPTOK | EXPOK; for (p = buf; width; width--) { c = __fgetwc(fp); /* * This code mimicks the integer conversion * code, but is much simpler. */ switch (c) { case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': flags &= ~(SIGNOK | NDIGITS); goto fok; case '+': case '-': if (flags & SIGNOK) { flags &= ~SIGNOK; goto fok; } break; case 'e': case 'E': /* no exponent without some digits */ if ((flags&(NDIGITS|EXPOK)) == EXPOK) { flags = (flags & ~(EXPOK|DPTOK)) | SIGNOK | NDIGITS; goto fok; } break; default: if (c == (wchar_t)decimal_point && (flags & DPTOK)) { flags &= ~(SIGNOK | DPTOK); goto fok; } break; } if (c != WEOF) __ungetwc(c, fp); break; fok: *p++ = c; } /* * If no digits, might be missing exponent digits * (just give back the exponent) or might be missing * regular digits, but had sign and/or decimal point. */ if (flags & NDIGITS) { if (flags & EXPOK) { /* no digits at all */ while (p > buf) __ungetwc(*--p, fp); goto match_failure; } /* just a bad exponent (e and maybe sign) */ c = *--p; if (c != 'e' && c != 'E') { __ungetwc(c, fp);/* sign */ c = *--p; } __ungetwc(c, fp); } if ((flags & SUPPRESS) == 0) { double res; *p = 0; /* XXX this loses precision for long doubles. */ res = wcstod(buf, NULL); if (flags & LONGDBL) *va_arg(ap, long double *) = res; else if (flags & LONG) *va_arg(ap, double *) = res; else *va_arg(ap, float *) = res; nassigned++; } nread += p - buf; nconversions++; break; #endif /* FLOATING_POINT */ } } input_failure: return (nconversions != 0 ? nassigned : EOF); match_failure: return (nassigned); }