/* No user fns here. Pesch 15apr92. */ /* * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms are permitted * provided that the above copyright notice and this paragraph are * duplicated in all such forms and that any documentation, * advertising materials, and other materials related to such * distribution and use acknowledge that the software was developed * by the University of California, Berkeley. The name of the * University may not be used to endorse or promote products derived * from this software without specific prior written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ #include <_ansi.h> #include #include #include #include #ifdef _HAVE_STDC #include #else #include #endif #include "local.h" #ifndef NO_FLOATING_POINT #define FLOATING_POINT #endif #ifdef FLOATING_POINT #include "floatio.h" #define BUF (MAXEXP+MAXFRACT+3) /* 3 = sign + decimal point + NUL */ /* An upper bound for how long a long prints in decimal. 4 / 13 approximates log (2). Add one char for roundoff compensation and one for the sign. */ #define MAX_LONG_LEN ((CHAR_BIT * sizeof (long) - 1) * 4 / 13 + 2) #else #define BUF 40 #endif /* * Flags used during conversion. */ #define LONG 0x01 /* l: long or double */ #define LONGDBL 0x02 /* L: long double; unimplemented */ #define SHORT 0x04 /* h: short */ #define SUPPRESS 0x08 /* suppress assignment */ #define POINTER 0x10 /* weird %p pointer (`fake hex') */ #define NOSKIP 0x20 /* do not skip blanks */ /* * 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 /* integer, i.e., strtol or strtoul */ #define CT_FLOAT 4 /* floating, i.e., strtod */ #if 0 #define u_char unsigned char #endif #define u_char char #define u_long unsigned long /*static*/ u_char *__sccl (); /* * vfscanf */ #define BufferEmpty (fp->_r <= 0 && __srefill(fp)) int __svfscanf (fp, fmt0, ap) register FILE *fp; char _CONST *fmt0; va_list ap; { register u_char *fmt = (u_char *) fmt0; register int c; /* character from format, or conversion */ register size_t width; /* field width, or 0 */ register char *p; /* points into all kinds of strings */ register int n; /* handy integer */ register int flags; /* flags as defined above */ register char *p0; /* saves original value of p when necessary */ int nassigned; /* number of fields assigned */ int nread; /* number of characters consumed from fp */ int base = 0; /* base argument to strtol/strtoul */ int nbytes = 1; /* number of bytes read from fmt string */ wchar_t wc; /* wchar to use to read format string */ u_long (*ccfn) () = 0; /* conversion function (strtol/strtoul) */ char ccltab[256]; /* character class table for %[...] */ char buf[BUF]; /* buffer for numeric conversions */ char *lptr; /* literal pointer */ #ifdef MB_CAPABLE int state = 0; /* value to keep track of multibyte state */ #endif short *sp; int *ip; float *flp; _LONG_DOUBLE *ldp; double *dp; long *lp; /* `basefix' is used to avoid `if' tests in the integer scanner */ static _CONST short basefix[17] = {10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16}; nassigned = 0; nread = 0; for (;;) { #ifndef MB_CAPABLE wc = *fmt; #else nbytes = _mbtowc_r (_REENT, &wc, fmt, MB_CUR_MAX, &state); #endif fmt += nbytes; if (wc == 0) return nassigned; if (nbytes == 1 && isspace (wc)) { for (;;) { if (BufferEmpty) return nassigned; if (!isspace (*fp->_p)) break; nread++, fp->_r--, fp->_p++; } continue; } if (wc != '%') 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: lptr = fmt - nbytes; for (n = 0; n < nbytes; ++n) { if (BufferEmpty) goto input_failure; if (*fp->_p != *lptr) goto match_failure; fp->_r--, fp->_p++; nread++; ++lptr; } continue; case '*': flags |= SUPPRESS; goto again; case 'l': flags |= LONG; goto again; case 'L': flags |= LONGDBL; goto again; case 'h': 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. 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; ccfn = (u_long (*)())strtol; base = 10; break; case 'i': c = CT_INT; ccfn = (u_long (*)())strtol; base = 0; break; case 'O': /* compat */ flags |= LONG; /* FALLTHROUGH */ case 'o': c = CT_INT; ccfn = strtoul; base = 8; break; case 'u': c = CT_INT; ccfn = strtoul; base = 10; break; case 'X': /* compat XXX */ case 'x': flags |= PFXOK; /* enable 0x prefixing */ c = CT_INT; ccfn = strtoul; base = 16; break; #ifdef FLOATING_POINT case 'E': /* compat XXX */ case 'G': /* compat XXX */ /* ANSI says that E,G and X behave the same way as e,g,x */ /* FALLTHROUGH */ case 'e': case 'f': case 'g': c = CT_FLOAT; break; #endif case 's': c = CT_STRING; break; case '[': fmt = __sccl (ccltab, 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; ccfn = strtoul; base = 16; break; case 'n': if (flags & SUPPRESS) /* ??? */ continue; if (flags & SHORT) { sp = va_arg (ap, short *); *sp = nread; } else if (flags & LONG) { lp = va_arg (ap, long *); *lp = nread; } else { ip = va_arg (ap, int *); *ip = nread; } continue; /* * Disgusting backwards compatibility hacks. XXX */ case '\0': /* compat */ return EOF; default: /* compat */ if (isupper (c)) flags |= LONG; c = CT_INT; ccfn = (u_long (*)())strtol; base = 10; break; } /* * We have a conversion that requires input. */ if (BufferEmpty) 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 #ifndef CYGNUS_NEC if (__srefill (fp)) #endif 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 & SUPPRESS) { size_t sum = 0; for (;;) { if ((n = fp->_r) < width) { sum += n; width -= n; fp->_p += n; #ifndef CYGNUS_NEC if (__srefill (fp)) { #endif if (sum == 0) goto input_failure; break; #ifndef CYGNUS_NEC } #endif } else { sum += width; fp->_r -= width; fp->_p += width; break; } } nread += sum; } else { #ifdef CYGNUS_NEC /* Kludge city for the moment */ char *dest = va_arg (ap, char *); int n = width; if (fp->_r == 0) goto input_failure; while (n && fp->_r) { *dest++ = *(fp->_p++); n--; fp->_r--; nread++; } #else size_t r = fread ((_PTR) va_arg (ap, char *), 1, width, fp); if (r == 0) goto input_failure; nread += r; #endif nassigned++; } break; case CT_CCL: /* scan a (nonempty) character class (sets NOSKIP) */ if (width == 0) width = ~0; /* `infinity' */ /* take only those things in the class */ if (flags & SUPPRESS) { n = 0; while (ccltab[*fp->_p]) { n++, fp->_r--, fp->_p++; if (--width == 0) break; if (BufferEmpty) { 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 (BufferEmpty) { if (p == p0) goto input_failure; break; } } n = p - p0; if (n == 0) goto match_failure; *p = 0; nassigned++; } nread += n; break; case CT_STRING: /* like CCL, but zero-length string OK, & no NOSKIP */ if (width == 0) width = ~0; if (flags & SUPPRESS) { n = 0; while (!isspace (*fp->_p)) { n++, fp->_r--, fp->_p++; if (--width == 0) break; if (BufferEmpty) break; } nread += n; } else { p0 = p = va_arg (ap, char *); while (!isspace (*fp->_p)) { fp->_r--; *p++ = *fp->_p++; if (--width == 0) break; if (BufferEmpty) break; } *p = 0; nread += p - p0; nassigned++; } continue; case CT_INT: /* scan an integer as if by strtol/strtoul */ #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; 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. */ break; ok: /* * c is legal: store it and look at the next. */ *p++ = c; if (--fp->_r > 0) fp->_p++; else #ifndef CYGNUS_NEC if (__srefill (fp)) #endif 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) _CAST_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) { u_long res; *p = 0; res = (*ccfn) (buf, (char **) NULL, base); if (flags & POINTER) *(va_arg (ap, _PTR *)) = (_PTR) (unsigned _POINTER_INT) res; else if (flags & SHORT) { sp = va_arg (ap, short *); *sp = res; } else if (flags & LONG) { lp = va_arg (ap, long *); *lp = res; } else { ip = va_arg (ap, int *); *ip = res; } nassigned++; } nread += p - buf; break; #ifdef FLOATING_POINT case CT_FLOAT: { /* scan a floating point number as if by strtod */ /* This code used to assume that the number of digits is reasonable. However, ANSI / ISO C makes no such stipulation; we have to get exact results even when there is an unreasonable amount of leading zeroes. */ long leading_zeroes, zeroes, exp_adjust; char *exp_start; #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; zeroes = 0; exp_adjust = 0; for (p = buf; width; ) { c = *fp->_p; /* * This code mimicks the integer conversion * code, but is much simpler. */ switch (c) { case '0': if (flags & NDIGITS) { flags &= ~SIGNOK; zeroes++; goto fskip; } /* Fall through. */ 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 '.': if (flags & DPTOK) { flags &= ~(SIGNOK | DPTOK); leading_zeroes = zeroes; goto fok; } break; case 'e': case 'E': /* no exponent without some digits */ if ((flags & (NDIGITS | EXPOK)) == EXPOK || ((flags & EXPOK) && zeroes)) { if (! (flags & DPTOK)) { exp_adjust = zeroes - leading_zeroes; exp_start = p; } flags = (flags & ~(EXPOK | DPTOK)) | SIGNOK | NDIGITS; zeroes = 0; goto fok; } break; } break; fok: *p++ = c; width--; fskip: ++nread; if (--fp->_r > 0) fp->_p++; else #ifndef CYGNUS_NEC if (__srefill (fp)) #endif break; /* EOF */ } if (zeroes) flags &= ~NDIGITS; /* * 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) { ungetc (*(u_char *)-- p, fp); --nread; } goto match_failure; } /* just a bad exponent (e and maybe sign) */ c = *(u_char *)-- p; --nread; if (c != 'e' && c != 'E') { _CAST_VOID ungetc (c, fp); /* sign */ c = *(u_char *)-- p; --nread; } _CAST_VOID ungetc (c, fp); } if ((flags & SUPPRESS) == 0) { double res; long new_exp; *p = 0; if ((flags & (DPTOK | EXPOK)) == EXPOK) { exp_adjust = zeroes - leading_zeroes; new_exp = -exp_adjust; exp_start = p; } else if (exp_adjust) new_exp = atol (exp_start + 1) - exp_adjust; if (exp_adjust) { /* If there might not be enough space for the new exponent, truncate some trailing digits to make room. */ if (exp_start >= buf + sizeof (buf) - MAX_LONG_LEN) exp_start = buf + sizeof (buf) - MAX_LONG_LEN - 1; sprintf (exp_start, "e%ld", new_exp); } res = atof (buf); if (flags & LONG) { dp = va_arg (ap, double *); *dp = res; } else if (flags & LONGDBL) { ldp = va_arg (ap, _LONG_DOUBLE *); *ldp = res; } else { flp = va_arg (ap, float *); *flp = res; } nassigned++; } break; } #endif /* FLOATING_POINT */ } } input_failure: return nassigned ? nassigned : -1; 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*/ u_char * __sccl (tab, fmt) register char *tab; register u_char *fmt; { register int c, n, v; /* 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 */ /* should probably use memset here */ for (n = 0; n < 256; n++) tab[n] = v; 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 == ']' || n < c) { c = '-'; break; /* resume the for(;;) */ } fmt++; do { /* fill in the range */ tab[++c] = v; } while (c < n); #if 1 /* XXX another disgusting compatibility hack */ /* * 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 */ }