/* $OpenBSD: vfwscanf.c,v 1.8 2022/12/27 17:10:06 jmc 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 #include #include #include #include #include #include #include #include #include "local.h" #ifdef FLOATING_POINT #include #include "floatio.h" #endif #define BUF 513 /* Maximum length of numeric string. */ /* * Flags used during conversion. */ #define LONG 0x00001 /* l: long or double */ #define LONGDBL 0x00002 /* L: long double */ #define SHORT 0x00004 /* h: short */ #define SHORTSHORT 0x00008 /* hh: 8 bit integer */ #define LLONG 0x00010 /* ll: long long (+ deprecated q: quad) */ #define POINTER 0x00020 /* p: void * (as hex) */ #define SIZEINT 0x00040 /* z: (signed) size_t */ #define MAXINT 0x00080 /* j: intmax_t */ #define PTRINT 0x00100 /* t: ptrdiff_t */ #define NOSKIP 0x00200 /* [ or c: do not skip blanks */ #define SUPPRESS 0x00400 /* *: suppress assignment */ #define UNSIGNED 0x00800 /* %[oupxX] conversions */ /* * The following are used in numeric conversions only: * SIGNOK, HAVESIGN, NDIGITS, DPTOK, and EXPOK are for floating point; * SIGNOK, HAVESIGN, NDIGITS, PFXOK, and NZDIGITS are for integral. */ #define SIGNOK 0x01000 /* +/- is (still) legal */ #define HAVESIGN 0x02000 /* sign detected */ #define NDIGITS 0x04000 /* no digits detected */ #define DPTOK 0x08000 /* (float) decimal point is still legal */ #define EXPOK 0x10000 /* (float) exponent (e+3, etc) still legal */ #define PFXOK 0x08000 /* 0x prefix is (still) legal */ #define NZDIGITS 0x10000 /* 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 /* integer, i.e., strtoimax or strtoumax */ #define CT_FLOAT 4 /* floating, i.e., strtod */ #define u_char unsigned char #define u_long unsigned long #define INCCL(_c) \ (cclcompl ? (wmemchr(ccls, (_c), ccle - ccls) == NULL) : \ (wmemchr(ccls, (_c), ccle - ccls) != NULL)) /* * 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 *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 */ char mbbuf[MB_LEN_MAX]; /* temporary mb. character buffer */ mbstate_t mbs; #ifdef FLOATING_POINT wchar_t decimal_point = 0; #endif /* `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 }; _SET_ORIENTATION(fp, 1); nassigned = 0; nconversions = 0; nread = 0; base = 0; /* XXX just to keep gcc happy */ ccls = ccle = NULL; 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++; 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. * * (According to ANSI, E and X formats are supposed * to the same as e and x. Sorry about that.) */ case 'D': /* compat */ flags |= LONG; /* FALLTHROUGH */ case 'd': c = CT_INT; base = 10; break; case 'i': c = CT_INT; base = 0; break; case 'O': /* compat */ flags |= LONG; /* FALLTHROUGH */ 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 'E': case 'f': case 'F': case 'g': case 'G': case 'a': case 'A': c = CT_FLOAT; break; #endif 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 |= 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; bzero(&mbs, 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: /* 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_unlock(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_unlock(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; bzero(&mbs, sizeof(mbs)); while ((wi = __fgetwc_unlock(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_unlock(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_unlock(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 *); bzero(&mbs, sizeof(mbs)); while ((wi = __fgetwc_unlock(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 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 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; 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 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) 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; #ifdef FLOATING_POINT 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; flags |= SIGNOK | NDIGITS | DPTOK | EXPOK; for (p = buf; width; width--) { c = __fgetwc_unlock(fp); /* * This code mimics 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 (decimal_point == 0) { bzero(&mbs, sizeof(mbs)); nconv = mbrtowc(&decimal_point, localeconv()->decimal_point, MB_CUR_MAX, &mbs); if (nconv == 0 || nconv == (size_t)-1 || nconv == (size_t)-2) decimal_point = '.'; } if (c == 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) { *p = 0; if (flags & LONGDBL) { long double res = wcstold(buf, NULL); *va_arg(ap, long double *) = res; } else if (flags & LONG) { double res = wcstod(buf, NULL); *va_arg(ap, double *) = res; } else { float res = wcstof(buf, NULL); *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); } int vfwscanf(FILE * __restrict fp, const wchar_t * __restrict fmt, __va_list ap) { int r; FLOCKFILE(fp); r = __vfwscanf(fp, fmt, ap); FUNLOCKFILE(fp); return (r); } DEF_STRONG(vfwscanf);