| /* $OpenBSD: vfwscanf.c,v 1.4 2014/03/19 05:17:01 guenther Exp $ */ |
| /*- |
| * 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. 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 "scanf_common.h" |
| // An interpretive version of __sccl from vfscanf.c --- a table of all wchar_t values would |
| // be a little too expensive, and some kind of compressed version isn't worth the trouble. |
| static inline bool in_ccl(wchar_t wc, const wchar_t* ccl) { |
| // Is this a negated set? |
| bool member_result = true; |
| if (*ccl == '^') { |
| member_result = false; |
| ++ccl; |
| } |
| |
| // The first character may be ']' or '-' without being special. |
| if (*ccl == '-' || *ccl == ']') { |
| // A literal match? |
| if (*ccl == wc) return member_result; |
| ++ccl; |
| } |
| |
| while (*ccl && *ccl != ']') { |
| // The last character may be '-' without being special. |
| if (*ccl == '-' && ccl[1] != '\0' && ccl[1] != ']') { |
| wchar_t first = *(ccl - 1); |
| wchar_t last = *(ccl + 1); |
| if (first <= last) { |
| // In the range? |
| if (wc >= first && wc <= last) return member_result; |
| ccl += 2; |
| continue; |
| } |
| // A '-' is not considered to be part of a range if the character after |
| // is not greater than the character before, so fall through... |
| } |
| // A literal match? |
| if (*ccl == wc) return member_result; |
| ++ccl; |
| } |
| return !member_result; |
| } |
| |
| #pragma GCC diagnostic push |
| #pragma GCC diagnostic ignored "-Wframe-larger-than=" |
| |
| /* |
| * vfwscanf |
| */ |
| 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 strtoimax/strtouimax */ |
| wchar_t buf[BUF]; /* buffer for numeric conversions */ |
| const wchar_t* ccl; |
| wint_t wi; /* handy wint_t */ |
| char* mbp; /* multibyte string pointer for %c %s %[ */ |
| size_t nconv; /* number of bytes in mb. conversion */ |
| char mbbuf[MB_LEN_MAX]; /* temporary mb. character buffer */ |
| mbstate_t mbs; |
| |
| _SET_ORIENTATION(fp, ORIENT_CHARS); |
| |
| nassigned = 0; |
| nconversions = 0; |
| nread = 0; |
| base = 0; /* XXX just to keep gcc happy */ |
| for (;;) { |
| c = *fmt++; |
| if (c == 0) { |
| return (nassigned); |
| } |
| if (iswspace(c)) { |
| while ((c = __fgetwc_unlock(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++; |
| reswitch: |
| switch (c) { |
| case '%': |
| literal: |
| if ((wi = __fgetwc_unlock(fp)) == WEOF) goto input_failure; |
| if (wi != c) { |
| __ungetwc(wi, fp); |
| goto match_failure; |
| } |
| nread++; |
| continue; |
| |
| case '*': |
| flags |= SUPPRESS; |
| goto again; |
| case 'j': |
| flags |= MAXINT; |
| goto again; |
| case 'L': |
| flags |= LONGDBL; |
| goto again; |
| case 'h': |
| if (*fmt == 'h') { |
| fmt++; |
| flags |= SHORTSHORT; |
| } else { |
| flags |= SHORT; |
| } |
| goto again; |
| case 'l': |
| if (*fmt == 'l') { |
| fmt++; |
| flags |= LLONG; |
| } else { |
| flags |= LONG; |
| } |
| goto again; |
| case 'q': |
| flags |= LLONG; /* deprecated */ |
| goto again; |
| case 't': |
| flags |= PTRINT; |
| goto again; |
| case 'z': |
| flags |= SIZEINT; |
| 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. |
| * Those marked `compat' are for 4.[123]BSD compatibility. |
| */ |
| case 'b': |
| c = CT_INT; |
| base = 2; |
| flags |= PFBOK; /* enable 0b prefixing */ |
| break; |
| |
| case 'D': /* compat */ |
| flags |= LONG; |
| __BIONIC_FALLTHROUGH; |
| case 'd': |
| c = CT_INT; |
| base = 10; |
| break; |
| |
| case 'i': |
| c = CT_INT; |
| base = 0; |
| break; |
| |
| case 'O': /* compat */ |
| flags |= LONG; |
| __BIONIC_FALLTHROUGH; |
| case 'o': |
| c = CT_INT; |
| flags |= UNSIGNED; |
| base = 8; |
| break; |
| |
| case 'u': |
| c = CT_INT; |
| flags |= UNSIGNED; |
| base = 10; |
| break; |
| |
| case 'w': { |
| int size = 0; |
| bool fast = false; |
| c = *fmt++; |
| while (is_digit(c)) { |
| APPEND_DIGIT(size, c); |
| c = *fmt++; |
| } |
| flags |= w_to_flag(size, fast); |
| goto reswitch; |
| } |
| |
| case 'X': |
| case 'x': |
| flags |= PFXOK; /* enable 0x prefixing */ |
| c = CT_INT; |
| flags |= UNSIGNED; |
| base = 16; |
| break; |
| |
| case 'e': |
| case 'E': |
| case 'f': |
| case 'F': |
| case 'g': |
| case 'G': |
| case 'a': |
| case 'A': |
| c = CT_FLOAT; |
| break; |
| |
| case 's': |
| c = CT_STRING; |
| break; |
| |
| case '[': |
| ccl = fmt; |
| if (*fmt == '^') fmt++; |
| if (*fmt == ']') fmt++; |
| while (*fmt != '\0' && *fmt != ']') fmt++; |
| fmt++; |
| flags |= NOSKIP; |
| c = CT_CCL; |
| break; |
| |
| case 'c': |
| flags |= NOSKIP; |
| c = CT_CHAR; |
| break; |
| |
| case 'p': /* pointer format is like hex */ |
| flags |= POINTER | PFXOK; |
| c = CT_INT; |
| flags |= UNSIGNED; |
| base = 16; |
| break; |
| |
| case 'n': |
| nconversions++; |
| if (flags & SUPPRESS) continue; |
| if (flags & SHORTSHORT) |
| *va_arg(ap, signed char*) = nread; |
| else if (flags & SHORT) |
| *va_arg(ap, short*) = nread; |
| else if (flags & LONG) |
| *va_arg(ap, long*) = nread; |
| else if (flags & SIZEINT) |
| *va_arg(ap, ssize_t*) = nread; |
| else if (flags & PTRINT) |
| *va_arg(ap, ptrdiff_t*) = nread; |
| else if (flags & LLONG) |
| *va_arg(ap, long long*) = nread; |
| else if (flags & MAXINT) |
| *va_arg(ap, intmax_t*) = nread; |
| else |
| *va_arg(ap, int*) = nread; |
| continue; |
| |
| /* |
| * Disgusting backwards compatibility hacks. XXX |
| */ |
| case '\0': /* compat */ |
| return (EOF); |
| |
| default: /* compat */ |
| if (iswupper(c)) flags |= LONG; |
| c = CT_INT; |
| base = 10; |
| break; |
| } |
| |
| /* |
| * Consume leading white space, except for formats |
| * that suppress this. |
| */ |
| if ((flags & NOSKIP) == 0) { |
| while ((wi = __fgetwc_unlock(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_unlock(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_unlock(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: |
| case CT_STRING: |
| // CT_CCL: scan a (nonempty) character class (sets NOSKIP). |
| // CT_STRING: like CCL, but zero-length string OK, & no NOSKIP. |
| if (width == 0) width = (size_t)~0; // 'infinity'. |
| if ((flags & SUPPRESS) && (flags & LONG)) { |
| n = 0; |
| while ((wi = __fgetwc_unlock(fp)) != WEOF && width-- != 0 && ((c == CT_CCL && in_ccl(wi, ccl)) || (c == CT_STRING && !iswspace(wi)))) n++; |
| if (wi != WEOF) __ungetwc(wi, fp); |
| } else if (flags & LONG) { |
| p0 = p = va_arg(ap, wchar_t*); |
| while ((wi = __fgetwc_unlock(fp)) != WEOF && width-- != 0 && ((c == CT_CCL && in_ccl(wi, ccl)) || (c == CT_STRING && !iswspace(wi)))) { |
| *p++ = (wchar_t)wi; |
| } |
| if (wi != WEOF) __ungetwc(wi, fp); |
| n = p - p0; |
| } else { |
| if (!(flags & SUPPRESS)) mbp = va_arg(ap, char*); |
| n = 0; |
| memset(&mbs, 0, sizeof(mbs)); |
| while ((wi = __fgetwc_unlock(fp)) != WEOF && width != 0 && ((c == CT_CCL && in_ccl(wi, ccl)) || (c == CT_STRING && !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; |
| n++; |
| } |
| if (wi != WEOF) __ungetwc(wi, fp); |
| } |
| if (c == CT_CCL && n == 0) goto match_failure; |
| if (!(flags & SUPPRESS)) { |
| if (flags & LONG) { |
| *p = L'\0'; |
| } else { |
| *mbp = '\0'; |
| } |
| ++nassigned; |
| } |
| nread += n; |
| nconversions++; |
| break; |
| |
| case CT_INT: |
| /* scan an integer as if by strtoimax/strtoumax */ |
| if (width == 0 || width > sizeof(buf) / sizeof(*buf) - 1) |
| width = sizeof(buf) / sizeof(*buf) - 1; |
| flags |= SIGNOK | NDIGITS | NZDIGITS; |
| for (p = buf; width; width--) { |
| c = __fgetwc_unlock(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 0b/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 |= PFBOK | PFXOK; |
| } |
| if (flags & NZDIGITS) { |
| flags &= ~(SIGNOK | NZDIGITS | NDIGITS); |
| } else { |
| flags &= ~(SIGNOK | PFBOK | PFXOK | NDIGITS); |
| } |
| goto ok; |
| |
| /* 1 through 7 always legal */ |
| case 'B': |
| case 'b': |
| // Is this 'b' potentially part of an "0b" prefix? |
| if ((flags & PFBOK) && p == buf + 1 + !!(flags & HAVESIGN)) { |
| base = 2; |
| flags &= ~PFBOK; |
| goto ok; |
| } |
| // No? Fall through and see if it's a hex digit instead then... |
| __BIONIC_FALLTHROUGH; |
| case '1': |
| case '2': |
| case '3': |
| case '4': |
| case '5': |
| case '6': |
| case '7': |
| case '8': |
| case '9': |
| case 'A': |
| case 'C': |
| case 'D': |
| case 'E': |
| case 'F': |
| case 'a': |
| case 'c': |
| case 'd': |
| case 'e': |
| case 'f': |
| if (base == 0) base = 10; |
| if (base != 16 && (int)(c - '0') >= base) break; /* not legal here */ |
| flags &= ~(SIGNOK | PFBOK | PFXOK | NDIGITS); |
| goto ok; |
| |
| /* sign ok only as first character */ |
| case '+': |
| case '-': |
| if (flags & SIGNOK) { |
| flags &= ~SIGNOK; |
| flags |= HAVESIGN; |
| goto ok; |
| } |
| break; |
| |
| /* |
| * x ok iff flag still set and 2nd char (or |
| * 3rd char if we have a sign). |
| */ |
| case 'x': |
| case 'X': |
| if ((flags & PFXOK) && p == buf + 1 + !!(flags & HAVESIGN)) { |
| 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 was `[-+]0[BbXx]`, push back and treat it |
| * as `[-+]0`. |
| */ |
| if (flags & NDIGITS) { |
| if (p > buf) __ungetwc(*--p, fp); |
| goto match_failure; |
| } |
| c = p[-1]; |
| if ((base == 2 && (c == 'b' || c == 'B')) || c == 'x' || c == 'X') { |
| --p; |
| __ungetwc(c, fp); |
| } |
| if ((flags & SUPPRESS) == 0) { |
| uintmax_t res; |
| |
| *p = '\0'; |
| if (flags & UNSIGNED) |
| 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 & MAXINT) |
| *va_arg(ap, intmax_t*) = res; |
| else if (flags & LLONG) |
| *va_arg(ap, long long*) = res; |
| else if (flags & SIZEINT) |
| *va_arg(ap, ssize_t*) = res; |
| else if (flags & PTRINT) |
| *va_arg(ap, ptrdiff_t*) = res; |
| else if (flags & LONG) |
| *va_arg(ap, long*) = res; |
| else if (flags & SHORT) |
| *va_arg(ap, short*) = res; |
| else if (flags & SHORTSHORT) |
| *va_arg(ap, signed char*) = res; |
| else |
| *va_arg(ap, int*) = res; |
| nassigned++; |
| } |
| nread += p - buf; |
| nconversions++; |
| break; |
| |
| case CT_FLOAT: |
| /* scan a floating point number as if by strtod */ |
| if (width == 0 || width > sizeof(buf) / sizeof(*buf) - 1) |
| width = sizeof(buf) / sizeof(*buf) - 1; |
| if ((width = wparsefloat(fp, buf, buf + width)) == 0) goto match_failure; |
| if ((flags & SUPPRESS) == 0) { |
| if (flags & LONGDBL) { |
| long double res = wcstold(buf, &p); |
| *va_arg(ap, long double*) = res; |
| } else if (flags & LONG) { |
| double res = wcstod(buf, &p); |
| *va_arg(ap, double*) = res; |
| } else { |
| float res = wcstof(buf, &p); |
| *va_arg(ap, float*) = res; |
| } |
| if (p - buf != (ptrdiff_t)width) abort(); |
| nassigned++; |
| } |
| nread += width; |
| nconversions++; |
| break; |
| } |
| } |
| input_failure: |
| return (nconversions != 0 ? nassigned : EOF); |
| match_failure: |
| return (nassigned); |
| } |
| #pragma GCC diagnostic pop |