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iovfscanf.c
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1994-10-13
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/*
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 GNU CC; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, 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
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
/* 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)
register _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