/*- * 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. * 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. */ #if defined(LIBC_SCCS) && !defined(lint) static char sccsid[] = "@(#)vfscanf.c 8.1 (Berkeley) 6/4/93"; #endif /* LIBC_SCCS and not lint */ #include __FBSDID("$FreeBSD$"); #include "namespace.h" #include #include #include #include #include #include #include #include #include #include "un-namespace.h" #include "collate.h" #include "libc_private.h" #include "local.h" #ifndef NO_FLOATING_POINT #include #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 integral conversions only: * SIGNOK, NDIGITS, PFXOK, and NZDIGITS */ #define SIGNOK 0x40 /* +/- is (still) legal */ #define NDIGITS 0x80 /* no digits detected */ #define PFXOK 0x100 /* 0x prefix is (still) legal */ #define NZDIGITS 0x200 /* no zero digits detected */ #define HAVESIGN 0x10000 /* sign 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 */ static const u_char *__sccl(char *, const u_char *); #ifndef NO_FLOATING_POINT static int parsefloat(FILE *, char *, char *); #endif __weak_reference(__vfscanf, vfscanf); /* * __vfscanf - MT-safe version */ int __vfscanf(FILE *fp, char const *fmt0, va_list ap) { int ret; FLOCKFILE(fp); ret = __svfscanf(fp, fmt0, ap); FUNLOCKFILE(fp); return (ret); } /* * __svfscanf - non-MT-safe version of __vfscanf */ int __svfscanf(FILE *fp, const char *fmt0, va_list ap) { const u_char *fmt = (const u_char *)fmt0; int c; /* character from format, or conversion */ size_t width; /* field width, or 0 */ char *p; /* points into all kinds of strings */ int n; /* handy integer */ int flags; /* flags as defined above */ char *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 */ char ccltab[256]; /* character class table for %[...] */ char buf[BUF]; /* buffer for numeric and mb conversions */ wchar_t *wcp; /* handy wide character pointer */ size_t nconv; /* length of multibyte sequence converted */ static const mbstate_t initial; mbstate_t mbs; /* `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 }; ORIENT(fp, -1); nassigned = 0; nconversions = 0; nread = 0; for (;;) { c = *fmt++; if (c == 0) return (nassigned); if (isspace(c)) { while ((fp->_r > 0 || __srefill(fp) == 0) && isspace(*fp->_p)) nread++, fp->_r--, fp->_p++; 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 (fp->_r <= 0 && __srefill(fp)) goto input_failure; if (*fp->_p != c) goto match_failure; fp->_r--, fp->_p++; 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; #ifndef NO_FLOATING_POINT case 'A': case 'E': case 'F': case 'G': case 'a': case 'e': case 'f': case 'g': c = CT_FLOAT; break; #endif case 'S': flags |= LONG; /* FALLTHROUGH */ case 's': c = CT_STRING; break; case '[': fmt = __sccl(ccltab, 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); } /* * We have a conversion that requires input. */ if (fp->_r <= 0 && __srefill(fp)) goto input_failure; /* * Consume leading white space, except for formats * that suppress this. */ if ((flags & NOSKIP) == 0) { while (isspace(*fp->_p)) { nread++; if (--fp->_r > 0) fp->_p++; else if (__srefill(fp)) goto input_failure; } /* * Note that there is at least one character in * the buffer, so conversions that do not set NOSKIP * ca no longer result in an input failure. */ } /* * Do the conversion. */ switch (c) { case CT_CHAR: /* scan arbitrary characters (sets NOSKIP) */ if (width == 0) width = 1; if (flags & LONG) { if ((flags & SUPPRESS) == 0) wcp = va_arg(ap, wchar_t *); else wcp = NULL; n = 0; while (width != 0) { if (n == MB_CUR_MAX) { fp->_flags |= __SERR; goto input_failure; } buf[n++] = *fp->_p; fp->_p++; fp->_r--; mbs = initial; nconv = mbrtowc(wcp, buf, n, &mbs); if (nconv == (size_t)-1) { fp->_flags |= __SERR; goto input_failure; } if (nconv == 0 && !(flags & SUPPRESS)) *wcp = L'\0'; if (nconv != (size_t)-2) { nread += n; width--; if (!(flags & SUPPRESS)) wcp++; n = 0; } if (fp->_r <= 0 && __srefill(fp)) { if (n != 0) { fp->_flags |= __SERR; goto input_failure; } break; } } if (!(flags & SUPPRESS)) nassigned++; } else if (flags & SUPPRESS) { size_t sum = 0; for (;;) { if ((n = fp->_r) < width) { sum += n; width -= n; fp->_p += n; if (__srefill(fp)) { if (sum == 0) goto input_failure; break; } } else { sum += width; fp->_r -= width; fp->_p += width; break; } } nread += sum; } else { size_t r = __fread((void *)va_arg(ap, char *), 1, width, fp); if (r == 0) goto input_failure; nread += r; 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 & LONG) { wchar_t twc; int nchars; if ((flags & SUPPRESS) == 0) wcp = va_arg(ap, wchar_t *); else wcp = &twc; n = 0; nchars = 0; while (width != 0) { if (n == MB_CUR_MAX) { fp->_flags |= __SERR; goto input_failure; } buf[n++] = *fp->_p; fp->_p++; fp->_r--; mbs = initial; nconv = mbrtowc(wcp, buf, n, &mbs); if (nconv == (size_t)-1) { fp->_flags |= __SERR; goto input_failure; } if (nconv == 0) *wcp = L'\0'; if (nconv != (size_t)-2) { if (wctob(*wcp) != EOF && !ccltab[wctob(*wcp)]) { while (n != 0) { n--; __ungetc(buf[n], fp); } break; } nread += n; width--; if (!(flags & SUPPRESS)) wcp++; nchars++; n = 0; } if (fp->_r <= 0 && __srefill(fp)) { if (n != 0) { fp->_flags |= __SERR; goto input_failure; } break; } } if (n != 0) { fp->_flags |= __SERR; goto input_failure; } n = nchars; if (n == 0) goto match_failure; if (!(flags & SUPPRESS)) { *wcp = L'\0'; nassigned++; } } else if (flags & SUPPRESS) { n = 0; while (ccltab[*fp->_p]) { n++, fp->_r--, fp->_p++; if (--width == 0) break; if (fp->_r <= 0 && __srefill(fp)) { if (n == 0) goto input_failure; break; } } if (n == 0) goto match_failure; } else { p0 = p = va_arg(ap, char *); while (ccltab[*fp->_p]) { fp->_r--; *p++ = *fp->_p++; if (--width == 0) break; if (fp->_r <= 0 && __srefill(fp)) { if (p == p0) goto input_failure; break; } } n = p - p0; if (n == 0) goto match_failure; *p = 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 & LONG) { wchar_t twc; if ((flags & SUPPRESS) == 0) wcp = va_arg(ap, wchar_t *); else wcp = &twc; n = 0; while (!isspace(*fp->_p) && width != 0) { if (n == MB_CUR_MAX) { fp->_flags |= __SERR; goto input_failure; } buf[n++] = *fp->_p; fp->_p++; fp->_r--; mbs = initial; nconv = mbrtowc(wcp, buf, n, &mbs); if (nconv == (size_t)-1) { fp->_flags |= __SERR; goto input_failure; } if (nconv == 0) *wcp = L'\0'; if (nconv != (size_t)-2) { if (iswspace(*wcp)) { while (n != 0) { n--; __ungetc(buf[n], fp); } break; } nread += n; width--; if (!(flags & SUPPRESS)) wcp++; n = 0; } if (fp->_r <= 0 && __srefill(fp)) { if (n != 0) { fp->_flags |= __SERR; goto input_failure; } break; } } if (!(flags & SUPPRESS)) { *wcp = L'\0'; nassigned++; } } else if (flags & SUPPRESS) { n = 0; while (!isspace(*fp->_p)) { n++, fp->_r--, fp->_p++; if (--width == 0) break; if (fp->_r <= 0 && __srefill(fp)) break; } nread += n; } else { p0 = p = va_arg(ap, char *); while (!isspace(*fp->_p)) { fp->_r--; *p++ = *fp->_p++; if (--width == 0) break; if (fp->_r <= 0 && __srefill(fp)) break; } *p = 0; nread += p - p0; 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 = *fp->_p; /* * 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 & 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. */ break; ok: /* * c is legal: store it and look at the next. */ *p++ = c; if (--fp->_r > 0) fp->_p++; else if (__srefill(fp)) break; /* EOF */ } /* * 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) (void) __ungetc(*(u_char *)--p, fp); goto match_failure; } c = ((u_char *)p)[-1]; if (c == 'x' || c == 'X') { --p; (void) __ungetc(c, fp); } if ((flags & SUPPRESS) == 0) { uintmax_t res; *p = 0; if ((flags & UNSIGNED) == 0) res = strtoimax(buf, (char **)NULL, base); else res = strtoumax(buf, (char **)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; #ifndef NO_FLOATING_POINT case CT_FLOAT: /* scan a floating point number as if by strtod */ if (width == 0 || width > sizeof(buf) - 1) width = sizeof(buf) - 1; if ((width = parsefloat(fp, buf, buf + width)) == 0) goto match_failure; if ((flags & SUPPRESS) == 0) { if (flags & LONGDBL) { long double res = strtold(buf, &p); *va_arg(ap, long double *) = res; } else if (flags & LONG) { double res = strtod(buf, &p); *va_arg(ap, double *) = res; } else { float res = strtof(buf, &p); *va_arg(ap, float *) = res; } nassigned++; } nread += width; nconversions++; break; #endif /* !NO_FLOATING_POINT */ } } input_failure: return (nconversions != 0 ? nassigned : EOF); match_failure: return (nassigned); } /* * Fill in the given table from the scanset at the given format * (just after `['). Return a pointer to the character past the * closing `]'. The table has a 1 wherever characters should be * considered part of the scanset. */ static const u_char * __sccl(tab, fmt) char *tab; const u_char *fmt; { int c, n, v, i; /* first `clear' the whole table */ c = *fmt++; /* first char hat => negated scanset */ if (c == '^') { v = 1; /* default => accept */ c = *fmt++; /* get new first char */ } else v = 0; /* default => reject */ /* XXX: Will not work if sizeof(tab*) > sizeof(char) */ (void) memset(tab, v, 256); if (c == 0) return (fmt - 1);/* format ended before closing ] */ /* * Now set the entries corresponding to the actual scanset * to the opposite of the above. * * The first character may be ']' (or '-') without being special; * the last character may be '-'. */ v = 1 - v; for (;;) { tab[c] = v; /* take character c */ doswitch: n = *fmt++; /* and examine the next */ switch (n) { case 0: /* format ended too soon */ return (fmt - 1); case '-': /* * A scanset of the form * [01+-] * is defined as `the digit 0, the digit 1, * the character +, the character -', but * the effect of a scanset such as * [a-zA-Z0-9] * is implementation defined. The V7 Unix * scanf treats `a-z' as `the letters a through * z', but treats `a-a' as `the letter a, the * character -, and the letter a'. * * For compatibility, the `-' is not considerd * to define a range if the character following * it is either a close bracket (required by ANSI) * or is not numerically greater than the character * we just stored in the table (c). */ n = *fmt; if (n == ']' || (__collate_load_error ? n < c : __collate_range_cmp (n, c) < 0 ) ) { c = '-'; break; /* resume the for(;;) */ } fmt++; /* fill in the range */ if (__collate_load_error) { do { tab[++c] = v; } while (c < n); } else { for (i = 0; i < 256; i ++) if ( __collate_range_cmp (c, i) < 0 && __collate_range_cmp (i, n) <= 0 ) tab[i] = v; } #if 1 /* XXX another disgusting compatibility hack */ c = n; /* * Alas, the V7 Unix scanf also treats formats * such as [a-c-e] as `the letters a through e'. * This too is permitted by the standard.... */ goto doswitch; #else c = *fmt++; if (c == 0) return (fmt - 1); if (c == ']') return (fmt); #endif break; case ']': /* end of scanset */ return (fmt); default: /* just another character */ c = n; break; } } /* NOTREACHED */ } #ifndef NO_FLOATING_POINT static int parsefloat(FILE *fp, char *buf, char *end) { char *commit, *p; int infnanpos = 0; enum { S_START, S_GOTSIGN, S_INF, S_NAN, S_MAYBEHEX, S_DIGITS, S_FRAC, S_EXP, S_EXPDIGITS } state = S_START; unsigned char c; char decpt = *localeconv()->decimal_point; _Bool gotmantdig = 0, ishex = 0; /* * We set commit = p whenever the string we have read so far * constitutes a valid representation of a floating point * number by itself. At some point, the parse will complete * or fail, and we will ungetc() back to the last commit point. * To ensure that the file offset gets updated properly, it is * always necessary to read at least one character that doesn't * match; thus, we can't short-circuit "infinity" or "nan(...)". */ commit = buf - 1; for (p = buf; p < end; ) { c = *fp->_p; reswitch: switch (state) { case S_START: state = S_GOTSIGN; if (c == '-' || c == '+') break; else goto reswitch; case S_GOTSIGN: switch (c) { case '0': state = S_MAYBEHEX; commit = p; break; case 'I': case 'i': state = S_INF; break; case 'N': case 'n': state = S_NAN; break; default: state = S_DIGITS; goto reswitch; } break; case S_INF: if (infnanpos > 6 || (c != "nfinity"[infnanpos] && c != "NFINITY"[infnanpos])) goto parsedone; if (infnanpos == 1 || infnanpos == 6) commit = p; /* inf or infinity */ infnanpos++; break; case S_NAN: switch (infnanpos) { case -1: /* XXX kludge to deal with nan(...) */ goto parsedone; case 0: if (c != 'A' && c != 'a') goto parsedone; break; case 1: if (c != 'N' && c != 'n') goto parsedone; else commit = p; break; case 2: if (c != '(') goto parsedone; break; default: if (c == ')') { commit = p; infnanpos = -2; } else if (!isalnum(c) && c != '_') goto parsedone; break; } infnanpos++; break; case S_MAYBEHEX: state = S_DIGITS; if (c == 'X' || c == 'x') { ishex = 1; break; } else { /* we saw a '0', but no 'x' */ gotmantdig = 1; goto reswitch; } case S_DIGITS: if ((ishex && isxdigit(c)) || isdigit(c)) gotmantdig = 1; else { state = S_FRAC; if (c != decpt) goto reswitch; } if (gotmantdig) commit = p; break; case S_FRAC: if (((c == 'E' || c == 'e') && !ishex) || ((c == 'P' || c == 'p') && ishex)) { if (!gotmantdig) goto parsedone; else state = S_EXP; } else if ((ishex && isxdigit(c)) || isdigit(c)) { commit = p; gotmantdig = 1; } else goto parsedone; break; case S_EXP: state = S_EXPDIGITS; if (c == '-' || c == '+') break; else goto reswitch; case S_EXPDIGITS: if (isdigit(c)) commit = p; else goto parsedone; break; default: abort(); } *p++ = c; if (--fp->_r > 0) fp->_p++; else if (__srefill(fp)) break; /* EOF */ } parsedone: while (commit < --p) __ungetc(*(u_char *)p, fp); *++commit = '\0'; return (commit - buf); } #endif