| /* |
| Copyright (C) 1993 Free Software Foundation |
| |
| This file is part of the GNU IO Library. This library is free |
| software; you can redistribute it and/or modify it under the |
| terms of the GNU General Public License as published by the |
| Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| This library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this library; see the file COPYING. If not, write to the Free |
| Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| |
| As a special exception, if you link this library with files |
| compiled with a GNU compiler to produce an executable, this does not cause |
| the resulting executable to be covered by the GNU General Public License. |
| This exception does not however invalidate any other reasons why |
| the executable file might be covered by the GNU General Public License. */ |
| |
| /* |
| * 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. |
| */ |
| |
| /* Extensively hacked for GNU iostream by Per Bothner 1991, 1992, 1993. |
| Changes copyright Free Software Foundation 1992, 1993. */ |
| |
| #if defined(LIBC_SCCS) && !defined(lint) |
| static char sccsid[] = "%W% (Berkeley) %G%"; |
| #endif /* LIBC_SCCS and not lint */ |
| |
| #include <libioP.h> |
| #include <ctype.h> |
| #ifdef __STDC__ |
| #include <stdarg.h> |
| #else |
| #include <varargs.h> |
| #endif |
| |
| #ifndef NO_FLOATING_POINT |
| #define FLOATING_POINT |
| #endif |
| |
| #ifdef FLOATING_POINT |
| #include "floatio.h" |
| #define BUF (MAXEXP+MAXFRACT+3) /* 3 = sign + decimal point + NUL */ |
| #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 */ |
| #define WIDTH 0x40 /* width */ |
| |
| /* |
| * 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 */ |
| |
| #define u_char unsigned char |
| #define u_long unsigned long |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| extern u_long strtoul __P((const char*, char**, int)); |
| extern long strtol __P((const char*, char**, int)); |
| static const u_char *__sccl __P((char *tab, const u_char *fmt)); |
| #ifndef _IO_USE_DTOA |
| extern double atof(); |
| #endif |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| /* If errp != NULL, *errp|=1 if we see a premature EOF; |
| *errp|=2 if we an invalid character. */ |
| |
| int |
| _IO_vfscanf (fp, fmt0, ap, errp) |
| _IO_FILE *fp; |
| char const *fmt0; |
| _IO_va_list ap; |
| int *errp; |
| { |
| register const u_char *fmt = (const u_char *)fmt0; |
| register int c; /* character from format, or conversion */ |
| register _IO_ssize_t width; /* field width, or 0 */ |
| register char *p; /* points into all kinds of strings */ |
| register int n; /* handy integer */ |
| register int flags = 0; /* 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 */ |
| /* Assignments to base and ccfn are just to suppress warnings from gcc.*/ |
| int base = 0; /* base argument to strtol/strtoul */ |
| typedef u_long (*strtoulfn) __P((const char*, char**, int)); |
| strtoulfn ccfn = 0; |
| /* conversion function (strtol/strtoul) */ |
| char ccltab[256]; /* character class table for %[...] */ |
| char buf[BUF]; /* buffer for numeric conversions */ |
| int seen_eof = 0; |
| |
| /* `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 }; |
| |
| nassigned = 0; |
| nread = 0; |
| for (;;) { |
| c = *fmt++; |
| if (c == 0) |
| goto done; |
| if (isspace(c)) { |
| for (;;) { |
| c = _IO_getc(fp); |
| if (c == EOF) { |
| seen_eof++; |
| break; |
| } |
| if (!isspace(c)) { |
| _IO_ungetc (c, fp); |
| break; |
| } |
| nread++; |
| } |
| 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: |
| n = _IO_getc(fp); |
| if (n == EOF) |
| goto eof_failure; |
| if (n != c) { |
| _IO_ungetc (n, fp); |
| goto match_failure; |
| } |
| nread++; |
| continue; |
| |
| case '*': |
| if (flags) goto control_failure; |
| flags = SUPPRESS; |
| goto again; |
| case 'l': |
| if (flags & ~(SUPPRESS | WIDTH)) goto control_failure; |
| flags |= LONG; |
| goto again; |
| case 'L': |
| if (flags & ~(SUPPRESS | WIDTH)) goto control_failure; |
| flags |= LONGDBL; |
| goto again; |
| case 'h': |
| if (flags & ~(SUPPRESS | WIDTH)) goto control_failure; |
| flags |= SHORT; |
| goto again; |
| |
| case '0': case '1': case '2': case '3': case '4': |
| case '5': case '6': case '7': case '8': case '9': |
| if (flags & ~(SUPPRESS | WIDTH)) goto control_failure; |
| flags |= WIDTH; |
| 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 = (strtoulfn)strtol; |
| base = 10; |
| break; |
| |
| case 'i': |
| c = CT_INT; |
| ccfn = (strtoulfn)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': |
| case 'x': |
| flags |= PFXOK; /* enable 0x prefixing */ |
| c = CT_INT; |
| ccfn = strtoul; |
| base = 16; |
| break; |
| |
| #ifdef FLOATING_POINT |
| case 'E': case 'F': |
| 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) |
| *va_arg(ap, short *) = nread; |
| else if (flags & LONG) |
| *va_arg(ap, long *) = nread; |
| else |
| *va_arg(ap, int *) = nread; |
| continue; |
| |
| /* |
| * Disgusting backwards compatibility hacks. XXX |
| */ |
| case '\0': /* compat */ |
| nassigned = EOF; |
| goto done; |
| |
| default: /* compat */ |
| if (isupper(c)) |
| flags |= LONG; |
| c = CT_INT; |
| ccfn = (strtoulfn)strtol; |
| base = 10; |
| break; |
| } |
| |
| /* |
| * We have a conversion that requires input. |
| */ |
| if (_IO_peekc(fp) == EOF) |
| goto eof_failure; |
| |
| /* |
| * Consume leading white space, except for formats |
| * that suppress this. |
| */ |
| if ((flags & NOSKIP) == 0) { |
| n = (unsigned char)*fp->_IO_read_ptr; |
| while (isspace(n)) { |
| fp->_IO_read_ptr++; |
| nread++; |
| n = _IO_peekc(fp); |
| if (n == EOF) |
| goto eof_failure; |
| } |
| /* Note that there is at least one character in |
| the buffer, so conversions that do not set NOSKIP |
| can no longer result in an input failure. */ |
| } |
| |
| /* |
| * Do the conversion. |
| */ |
| switch (c) { |
| |
| case CT_CHAR: |
| /* scan arbitrary characters (sets NOSKIP) */ |
| if (width == 0) /* FIXME! */ |
| width = 1; |
| if (flags & SUPPRESS) { |
| _IO_size_t sum = 0; |
| for (;;) { |
| n = fp->_IO_read_end - fp->_IO_read_ptr; |
| if (n < (int)width) { |
| sum += n; |
| width -= n; |
| fp->_IO_read_ptr += n; |
| if (__underflow(fp) == EOF) |
| if (sum == 0) |
| goto eof_failure; |
| else { |
| seen_eof++; |
| break; |
| } |
| } else { |
| sum += width; |
| fp->_IO_read_ptr += width; |
| break; |
| } |
| } |
| nread += sum; |
| } else { |
| _IO_size_t r = |
| |
| _IO_XSGETN (fp, (char*)va_arg(ap, char*), width); |
| if (r != width) |
| goto eof_failure; |
| nread += r; |
| 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[(unsigned char)*fp->_IO_read_ptr]) { |
| n++, fp->_IO_read_ptr++; |
| if (--width == 0) |
| break; |
| if (_IO_peekc(fp) == EOF) { |
| if (n == 0) |
| goto eof_failure; |
| seen_eof++; |
| break; |
| } |
| } |
| if (n == 0) |
| goto match_failure; |
| } else { |
| p0 = p = va_arg(ap, char *); |
| while (ccltab[(unsigned char)*fp->_IO_read_ptr]) { |
| *p++ = *fp->_IO_read_ptr++; |
| if (--width == 0) |
| break; |
| if (_IO_peekc(fp) == EOF) { |
| if (p == p0) |
| goto eof_failure; |
| seen_eof++; |
| 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((unsigned char)*fp->_IO_read_ptr)) { |
| n++, fp->_IO_read_ptr++; |
| if (--width == 0) |
| break; |
| if (_IO_peekc(fp) == EOF) { |
| seen_eof++; |
| break; |
| } |
| } |
| nread += n; |
| } else { |
| p0 = p = va_arg(ap, char *); |
| while (!isspace((unsigned char)*fp->_IO_read_ptr)) { |
| *p++ = *fp->_IO_read_ptr++; |
| if (--width == 0) |
| break; |
| if (_IO_peekc(fp) == EOF) { |
| seen_eof++; |
| break; |
| } |
| } |
| *p = 0; |
| nread += p - p0; |
| nassigned++; |
| } |
| continue; |
| |
| case CT_INT: |
| /* scan an integer as if by strtol/strtoul */ |
| if (width == 0 || width > sizeof(buf) - 1) |
| width = sizeof(buf) - 1; |
| flags |= SIGNOK | NDIGITS | NZDIGITS; |
| for (p = buf; width; width--) { |
| c = (unsigned char)*fp->_IO_read_ptr; |
| /* |
| * 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; |
| fp->_IO_read_ptr++; |
| if (_IO_peekc(fp) == EOF) { |
| seen_eof++; |
| 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) _IO_ungetc(*(u_char *)--p, fp); |
| goto match_failure; |
| } |
| c = ((u_char *)p)[-1]; |
| if (c == 'x' || c == 'X') { |
| --p; |
| (void) _IO_ungetc (c, fp); |
| } |
| if ((flags & SUPPRESS) == 0) { |
| u_long res; |
| |
| *p = 0; |
| res = (*ccfn)(buf, (char **)NULL, base); |
| if (flags & POINTER) |
| *va_arg(ap, void **) = (void *)res; |
| else if (flags & SHORT) |
| *va_arg(ap, short *) = res; |
| else if (flags & LONG) |
| *va_arg(ap, long *) = res; |
| else |
| *va_arg(ap, int *) = res; |
| nassigned++; |
| } |
| nread += p - buf; |
| break; |
| |
| #ifdef 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; |
| flags |= SIGNOK | NDIGITS | DPTOK | EXPOK; |
| for (p = buf; width; width--) { |
| c = (unsigned char)*fp->_IO_read_ptr; |
| /* |
| * 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 '.': |
| if (flags & DPTOK) { |
| flags &= ~(SIGNOK | DPTOK); |
| 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; |
| } |
| break; |
| fok: |
| *p++ = c; |
| fp->_IO_read_ptr++; |
| if (_IO_peekc(fp) == EOF) { |
| seen_eof++; |
| break; /* EOF */ |
| } |
| } |
| /* |
| * 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) |
| _IO_ungetc (*(u_char *)--p, fp); |
| goto match_failure; |
| } |
| /* just a bad exponent (e and maybe sign) */ |
| c = *(u_char *)--p; |
| if (c != 'e' && c != 'E') { |
| (void) _IO_ungetc (c, fp);/* sign */ |
| c = *(u_char *)--p; |
| } |
| (void) _IO_ungetc (c, fp); |
| } |
| if ((flags & SUPPRESS) == 0) { |
| double res; |
| *p = 0; |
| #ifdef _IO_USE_DTOA |
| res = _IO_strtod(buf, NULL); |
| #else |
| res = atof(buf); |
| #endif |
| if (flags & LONG) |
| *va_arg(ap, double *) = res; |
| else |
| *va_arg(ap, float *) = res; |
| nassigned++; |
| } |
| nread += p - buf; |
| break; |
| #endif /* FLOATING_POINT */ |
| } |
| } |
| eof_failure: |
| seen_eof++; |
| input_failure: |
| if (nassigned == 0) |
| nassigned = -1; |
| control_failure: |
| match_failure: |
| if (errp) |
| *errp |= 2; |
| done: |
| if (errp && seen_eof) |
| *errp |= 1; |
| 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; |
| { |
| 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 */ |
| } |