768 lines
20 KiB
C
768 lines
20 KiB
C
/* __gmp_doscan -- formatted input internals.
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THE FUNCTIONS IN THIS FILE ARE FOR INTERNAL USE ONLY. THEY'RE ALMOST
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CERTAIN TO BE SUBJECT TO INCOMPATIBLE CHANGES OR DISAPPEAR COMPLETELY IN
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FUTURE GNU MP RELEASES.
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Copyright 2001-2003 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of either:
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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or
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* the GNU General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any
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later version.
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or both in parallel, as here.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received copies of the GNU General Public License and the
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GNU Lesser General Public License along with the GNU MP Library. If not,
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see https://www.gnu.org/licenses/. */
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#define _GNU_SOURCE /* for DECIMAL_POINT in langinfo.h */
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#include "config.h" /* needed for the HAVE_, could also move gmp incls */
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#include <stdarg.h>
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#include <ctype.h>
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#include <stddef.h> /* for ptrdiff_t */
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#include <stdio.h>
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#include <stdlib.h> /* for strtol */
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#include <string.h>
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#if HAVE_LANGINFO_H
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#include <langinfo.h> /* for nl_langinfo */
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#endif
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#if HAVE_LOCALE_H
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#include <locale.h> /* for localeconv */
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#endif
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#if HAVE_INTTYPES_H
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# include <inttypes.h> /* for intmax_t */
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#else
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# if HAVE_STDINT_H
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# include <stdint.h>
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# endif
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#endif
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#if HAVE_SYS_TYPES_H
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#include <sys/types.h> /* for quad_t */
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#endif
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#include "gmp-impl.h"
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/* Change this to "#define TRACE(x) x" for some traces. */
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#define TRACE(x)
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/* General:
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It's necessary to parse up the format string to recognise the GMP
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extra types F, Q and Z. Other types and conversions are passed
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across to the standard sscanf or fscanf via funs->scan, for ease of
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implementation. This is essential in the case of something like glibc
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%p where the pointer format isn't actually documented.
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Because funs->scan doesn't get the whole input it can't put the right
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values in for %n, so that's handled in __gmp_doscan. Neither sscanf
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nor fscanf directly indicate how many characters were read, so an
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extra %n is appended to each run for that. For fscanf this merely
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supports our %n output, but for sscanf it lets funs->step move us
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along the input string.
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Whitespace and literal matches in the format string, including %%,
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are handled directly within __gmp_doscan. This is reasonably
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efficient, and avoids some suspicious behaviour observed in various
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system libc's. GLIBC 2.2.4 for instance returns 0 on
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sscanf(" ", " x")
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or
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sscanf(" ", " x%d",&n)
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whereas we think they should return EOF, since end-of-string is
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reached when a match of "x" is required.
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For standard % conversions, funs->scan is called once for each
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conversion. If we had vfscanf and vsscanf and could rely on their
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fixed text matching behaviour then we could call them with multiple
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consecutive standard conversions. But plain fscanf and sscanf work
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fine, and parsing one field at a time shouldn't be too much of a
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slowdown.
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gmpscan:
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gmpscan reads a gmp type. It's only used from one place, but is a
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separate subroutine to avoid a big chunk of complicated code in the
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middle of __gmp_doscan. Within gmpscan a couple of loopbacks make it
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possible to share code for parsing integers, rationals and floats.
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In gmpscan normally one char of lookahead is maintained, but when width
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is reached that stops, on the principle that an fgetc/ungetc of a char
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past where we're told to stop would be undesirable. "chars" is how many
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characters have been read so far, including the current c. When
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chars==width and another character is desired then a jump is done to the
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"convert" stage. c is invalid and mustn't be unget'ed in this case;
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chars is set to width+1 to indicate that.
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gmpscan normally returns the number of characters read. -1 means an
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invalid field, -2 means EOF reached before any matching characters
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were read.
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For hex floats, the mantissa part is passed to mpf_set_str, then the
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exponent is applied with mpf_mul_exp or mpf_div_2exp. This is easier
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than teaching mpf_set_str about an exponent factor (ie. 2) differing
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from the mantissa radix point factor (ie. 16). mpf_mul_exp and
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mpf_div_2exp will preserve the application requested precision, so
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nothing in that respect is lost by making this a two-step process.
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Matching and errors:
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C99 7.19.6.2 paras 9 and 10 say an input item is read as the longest
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string which is a match for the appropriate type, or a prefix of a
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match. With that done, if it's only a prefix then the result is a
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matching failure, ie. invalid input.
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This rule seems fairly clear, but doesn't seem to be universally
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applied in system C libraries. Even GLIBC doesn't seem to get it
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right, insofar as it seems to accept some apparently invalid forms.
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Eg. glibc 2.3.1 accepts "0x" for a "%i", where a reading of the
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standard would suggest a non-empty sequence of digits should be
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required after an "0x".
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A footnote to 7.19.6.2 para 17 notes how this input item reading can
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mean inputs acceptable to strtol are not acceptable to fscanf. We
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think this confirms our reading of "0x" as invalid.
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Clearly gmp_sscanf could backtrack to a longest input which was a
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valid match for a given item, but this is not done, since C99 says
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sscanf is identical to fscanf, so we make gmp_sscanf identical to
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gmp_fscanf.
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Types:
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C99 says "ll" is for long long, and "L" is for long double floats.
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Unfortunately in GMP 4.1.1 we documented the two as equivalent. This
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doesn't affect us directly, since both are passed through to plain
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scanf. It seems wisest not to try to enforce the C99 rule. This is
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consistent with what we said before, though whether it actually
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worked was always up to the C library.
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Alternatives:
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Consideration was given to using separate code for gmp_fscanf and
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gmp_sscanf. The sscanf case could zip across a string doing literal
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matches or recognising digits in gmpscan, rather than making a
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function call fun->get per character. The fscanf could use getc
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rather than fgetc too, which might help those systems where getc is a
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macro or otherwise inlined. But none of this scanning and converting
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will be particularly fast, so the two are done together to keep it a
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little simpler for now.
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Various multibyte string issues are not addressed, for a start C99
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scanf says the format string is multibyte. Since we pass %c, %s and
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%[ to the system scanf, they might do multibyte reads already, but
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it's another matter whether or not that can be used, since our digit
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and whitespace parsing is only unibyte. The plan is to quietly
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ignore multibyte locales for now. This is not as bad as it sounds,
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since GMP is presumably used mostly on numbers, which can be
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perfectly adequately treated in plain ASCII.
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*/
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struct gmp_doscan_params_t {
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int base;
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int ignore;
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char type;
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int width;
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};
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#define GET(c) \
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do { \
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ASSERT (chars <= width); \
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chars++; \
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if (chars > width) \
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goto convert; \
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(c) = (*funs->get) (data); \
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} while (0)
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/* store into "s", extending if necessary */
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#define STORE(c) \
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do { \
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ASSERT (s_upto <= s_alloc); \
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if (s_upto >= s_alloc) \
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{ \
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size_t s_alloc_new = s_alloc + S_ALLOC_STEP; \
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s = __GMP_REALLOCATE_FUNC_TYPE (s, s_alloc, s_alloc_new, char); \
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s_alloc = s_alloc_new; \
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} \
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s[s_upto++] = c; \
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} while (0)
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#define S_ALLOC_STEP 512
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static int
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gmpscan (const struct gmp_doscan_funs_t *funs, void *data,
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const struct gmp_doscan_params_t *p, void *dst)
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{
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int chars, c, base, first, width, seen_point, seen_digit, hexfloat;
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size_t s_upto, s_alloc, hexexp;
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char *s;
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int invalid = 0;
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TRACE (printf ("gmpscan\n"));
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ASSERT (p->type == 'F' || p->type == 'Q' || p->type == 'Z');
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c = (*funs->get) (data);
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if (c == EOF)
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return -2;
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chars = 1;
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first = 1;
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seen_point = 0;
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width = (p->width == 0 ? INT_MAX-1 : p->width);
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base = p->base;
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s_alloc = S_ALLOC_STEP;
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s = __GMP_ALLOCATE_FUNC_TYPE (s_alloc, char);
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s_upto = 0;
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hexfloat = 0;
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hexexp = 0;
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another:
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seen_digit = 0;
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if (c == '-')
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{
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STORE (c);
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goto get_for_sign;
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}
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else if (c == '+')
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{
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/* don't store '+', it's not accepted by mpz_set_str etc */
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get_for_sign:
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GET (c);
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}
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if (base == 0)
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{
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base = 10; /* decimal if no base indicator */
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if (c == '0')
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{
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seen_digit = 1; /* 0 alone is a valid number */
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if (p->type != 'F')
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base = 8; /* leading 0 is octal, for non-floats */
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STORE (c);
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GET (c);
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if (c == 'x' || c == 'X')
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{
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base = 16;
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seen_digit = 0; /* must have digits after an 0x */
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if (p->type == 'F') /* don't pass 'x' to mpf_set_str_point */
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hexfloat = 1;
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else
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STORE (c);
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GET (c);
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}
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}
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}
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digits:
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for (;;)
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{
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if (base == 16)
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{
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if (! isxdigit (c))
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break;
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}
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else
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{
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if (! isdigit (c))
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break;
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if (base == 8 && (c == '8' || c == '9'))
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break;
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}
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seen_digit = 1;
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STORE (c);
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GET (c);
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}
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if (first)
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{
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/* decimal point */
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if (p->type == 'F' && ! seen_point)
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{
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/* For a multi-character decimal point, if the first character is
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present then all of it must be, otherwise the input is
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considered invalid. */
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const char *point = GMP_DECIMAL_POINT;
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int pc = (unsigned char) *point++;
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if (c == pc)
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{
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for (;;)
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{
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STORE (c);
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GET (c);
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pc = (unsigned char) *point++;
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if (pc == '\0')
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break;
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if (c != pc)
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goto set_invalid;
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}
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seen_point = 1;
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goto digits;
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}
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}
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/* exponent */
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if (p->type == 'F')
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{
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if (hexfloat && (c == 'p' || c == 'P'))
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{
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hexexp = s_upto; /* exponent location */
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base = 10; /* exponent in decimal */
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goto exponent;
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}
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else if (! hexfloat && (c == 'e' || c == 'E'))
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{
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exponent:
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/* must have at least one digit in the mantissa, just an exponent
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is not good enough */
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if (! seen_digit)
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goto set_invalid;
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do_second:
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first = 0;
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STORE (c);
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GET (c);
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goto another;
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}
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}
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/* denominator */
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if (p->type == 'Q' && c == '/')
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{
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/* must have at least one digit in the numerator */
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if (! seen_digit)
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goto set_invalid;
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/* now look for at least one digit in the denominator */
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seen_digit = 0;
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/* allow the base to be redetermined for "%i" */
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base = p->base;
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goto do_second;
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}
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}
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convert:
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if (! seen_digit)
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{
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set_invalid:
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invalid = 1;
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goto done;
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}
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if (! p->ignore)
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{
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STORE ('\0');
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TRACE (printf (" convert \"%s\"\n", s));
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/* We ought to have parsed out a valid string above, so just test
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mpz_set_str etc with an ASSERT. */
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switch (p->type) {
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case 'F':
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{
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mpf_ptr f = (mpf_ptr) dst;
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if (hexexp != 0)
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s[hexexp] = '\0';
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ASSERT_NOCARRY (mpf_set_str (f, s, hexfloat ? 16 : 10));
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if (hexexp != 0)
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{
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char *dummy;
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long exp;
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exp = strtol (s + hexexp + 1, &dummy, 10);
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if (exp >= 0)
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mpf_mul_2exp (f, f, (unsigned long) exp);
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else
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mpf_div_2exp (f, f, NEG_CAST (unsigned long, exp));
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}
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}
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break;
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case 'Q':
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ASSERT_NOCARRY (mpq_set_str ((mpq_ptr) dst, s, p->base));
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break;
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case 'Z':
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ASSERT_NOCARRY (mpz_set_str ((mpz_ptr) dst, s, p->base));
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break;
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default:
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ASSERT (0);
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/*FALLTHRU*/
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break;
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}
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}
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done:
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ASSERT (chars <= width+1);
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if (chars != width+1)
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{
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(*funs->unget) (c, data);
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TRACE (printf (" ungetc %d, to give %d chars\n", c, chars-1));
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}
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chars--;
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(*__gmp_free_func) (s, s_alloc);
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if (invalid)
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{
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TRACE (printf (" invalid\n"));
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return -1;
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}
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TRACE (printf (" return %d chars (cf width %d)\n", chars, width));
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return chars;
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}
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/* Read and discard whitespace, if any. Return number of chars skipped.
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Whitespace skipping never provokes the EOF return from __gmp_doscan, so
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it's not necessary to watch for EOF from funs->get, */
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static int
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skip_white (const struct gmp_doscan_funs_t *funs, void *data)
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{
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int c;
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int ret = 0;
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do
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{
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c = (funs->get) (data);
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ret++;
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}
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while (isspace (c));
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(funs->unget) (c, data);
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ret--;
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TRACE (printf (" skip white %d\n", ret));
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return ret;
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}
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int
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__gmp_doscan (const struct gmp_doscan_funs_t *funs, void *data,
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const char *orig_fmt, va_list orig_ap)
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{
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struct gmp_doscan_params_t param;
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va_list ap;
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char *alloc_fmt;
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const char *fmt, *this_fmt, *end_fmt;
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size_t orig_fmt_len, alloc_fmt_size, len;
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int new_fields, new_chars;
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char fchar;
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int fields = 0;
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int chars = 0;
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TRACE (printf ("__gmp_doscan \"%s\"\n", orig_fmt);
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if (funs->scan == (gmp_doscan_scan_t) sscanf)
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printf (" s=\"%s\"\n", * (const char **) data));
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/* Don't modify orig_ap, if va_list is actually an array and hence call by
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reference. It could be argued that it'd be more efficient to leave
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callers to make a copy if they care, but doing so here is going to be a
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very small part of the total work, and we may as well keep applications
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out of trouble. */
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va_copy (ap, orig_ap);
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/* Parts of the format string are going to be copied so that a " %n" can
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be appended. alloc_fmt is some space for that. orig_fmt_len+4 will be
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needed if fmt consists of a single "%" specifier, but otherwise is an
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overestimate. We're not going to be very fast here, so use
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__gmp_allocate_func rather than TMP_ALLOC. */
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orig_fmt_len = strlen (orig_fmt);
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alloc_fmt_size = orig_fmt_len + 4;
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alloc_fmt = __GMP_ALLOCATE_FUNC_TYPE (alloc_fmt_size, char);
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fmt = orig_fmt;
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end_fmt = orig_fmt + orig_fmt_len;
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for (;;)
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{
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next:
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fchar = *fmt++;
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if (fchar == '\0')
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break;
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if (isspace (fchar))
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{
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chars += skip_white (funs, data);
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continue;
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}
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if (fchar != '%')
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{
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int c;
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literal:
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c = (funs->get) (data);
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if (c != fchar)
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{
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(funs->unget) (c, data);
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if (c == EOF)
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{
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eof_no_match:
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if (fields == 0)
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fields = EOF;
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}
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goto done;
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}
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chars++;
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continue;
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}
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param.type = '\0';
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param.base = 0; /* for e,f,g,i */
|
|
param.ignore = 0;
|
|
param.width = 0;
|
|
|
|
this_fmt = fmt-1;
|
|
TRACE (printf (" this_fmt \"%s\"\n", this_fmt));
|
|
|
|
for (;;)
|
|
{
|
|
ASSERT (fmt <= end_fmt);
|
|
|
|
fchar = *fmt++;
|
|
switch (fchar) {
|
|
|
|
case '\0': /* unterminated % sequence */
|
|
ASSERT (0);
|
|
goto done;
|
|
|
|
case '%': /* literal % */
|
|
goto literal;
|
|
|
|
case '[': /* character range */
|
|
fchar = *fmt++;
|
|
if (fchar == '^')
|
|
fchar = *fmt++;
|
|
/* ']' allowed as the first char (possibly after '^') */
|
|
if (fchar == ']')
|
|
fchar = *fmt++;
|
|
for (;;)
|
|
{
|
|
ASSERT (fmt <= end_fmt);
|
|
if (fchar == '\0')
|
|
{
|
|
/* unterminated % sequence */
|
|
ASSERT (0);
|
|
goto done;
|
|
}
|
|
if (fchar == ']')
|
|
break;
|
|
fchar = *fmt++;
|
|
}
|
|
/*FALLTHRU*/
|
|
case 'c': /* characters */
|
|
case 's': /* string of non-whitespace */
|
|
case 'p': /* pointer */
|
|
libc_type:
|
|
len = fmt - this_fmt;
|
|
memcpy (alloc_fmt, this_fmt, len);
|
|
alloc_fmt[len++] = '%';
|
|
alloc_fmt[len++] = 'n';
|
|
alloc_fmt[len] = '\0';
|
|
|
|
TRACE (printf (" scan \"%s\"\n", alloc_fmt);
|
|
if (funs->scan == (gmp_doscan_scan_t) sscanf)
|
|
printf (" s=\"%s\"\n", * (const char **) data));
|
|
|
|
new_chars = -1;
|
|
if (param.ignore)
|
|
{
|
|
new_fields = (*funs->scan) (data, alloc_fmt, &new_chars, NULL);
|
|
ASSERT (new_fields == 0 || new_fields == EOF);
|
|
}
|
|
else
|
|
{
|
|
void *arg = va_arg (ap, void *);
|
|
new_fields = (*funs->scan) (data, alloc_fmt, arg, &new_chars);
|
|
ASSERT (new_fields==0 || new_fields==1 || new_fields==EOF);
|
|
|
|
if (new_fields == 0)
|
|
goto done; /* invalid input */
|
|
|
|
if (new_fields == 1)
|
|
ASSERT (new_chars != -1);
|
|
}
|
|
TRACE (printf (" new_fields %d new_chars %d\n",
|
|
new_fields, new_chars));
|
|
|
|
if (new_fields == -1)
|
|
goto eof_no_match; /* EOF before anything matched */
|
|
|
|
/* Under param.ignore, when new_fields==0 we don't know if
|
|
it's a successful match or an invalid field. new_chars
|
|
won't have been assigned if it was an invalid field. */
|
|
if (new_chars == -1)
|
|
goto done; /* invalid input */
|
|
|
|
chars += new_chars;
|
|
(*funs->step) (data, new_chars);
|
|
|
|
increment_fields:
|
|
if (! param.ignore)
|
|
fields++;
|
|
goto next;
|
|
|
|
case 'd': /* decimal */
|
|
case 'u': /* decimal */
|
|
param.base = 10;
|
|
goto numeric;
|
|
|
|
case 'e': /* float */
|
|
case 'E': /* float */
|
|
case 'f': /* float */
|
|
case 'g': /* float */
|
|
case 'G': /* float */
|
|
case 'i': /* integer with base marker */
|
|
numeric:
|
|
if (param.type != 'F' && param.type != 'Q' && param.type != 'Z')
|
|
goto libc_type;
|
|
|
|
chars += skip_white (funs, data);
|
|
|
|
new_chars = gmpscan (funs, data, ¶m,
|
|
param.ignore ? NULL : va_arg (ap, void*));
|
|
if (new_chars == -2)
|
|
goto eof_no_match;
|
|
if (new_chars == -1)
|
|
goto done;
|
|
|
|
ASSERT (new_chars >= 0);
|
|
chars += new_chars;
|
|
goto increment_fields;
|
|
|
|
case 'a': /* glibc allocate string */
|
|
case '\'': /* glibc digit groupings */
|
|
break;
|
|
|
|
case 'F': /* mpf_t */
|
|
case 'j': /* intmax_t */
|
|
case 'L': /* long long */
|
|
case 'q': /* quad_t */
|
|
case 'Q': /* mpq_t */
|
|
case 't': /* ptrdiff_t */
|
|
case 'z': /* size_t */
|
|
case 'Z': /* mpz_t */
|
|
set_type:
|
|
param.type = fchar;
|
|
break;
|
|
|
|
case 'h': /* short or char */
|
|
if (param.type != 'h')
|
|
goto set_type;
|
|
param.type = 'H'; /* internal code for "hh" */
|
|
break;
|
|
|
|
goto numeric;
|
|
|
|
case 'l': /* long, long long, double or long double */
|
|
if (param.type != 'l')
|
|
goto set_type;
|
|
param.type = 'L'; /* "ll" means "L" */
|
|
break;
|
|
|
|
case 'n':
|
|
if (! param.ignore)
|
|
{
|
|
void *p;
|
|
p = va_arg (ap, void *);
|
|
TRACE (printf (" store %%n to %p\n", p));
|
|
switch (param.type) {
|
|
case '\0': * (int *) p = chars; break;
|
|
case 'F': mpf_set_si ((mpf_ptr) p, (long) chars); break;
|
|
case 'H': * (char *) p = chars; break;
|
|
case 'h': * (short *) p = chars; break;
|
|
#if HAVE_INTMAX_T
|
|
case 'j': * (intmax_t *) p = chars; break;
|
|
#else
|
|
case 'j': ASSERT_FAIL (intmax_t not available); break;
|
|
#endif
|
|
case 'l': * (long *) p = chars; break;
|
|
#if HAVE_QUAD_T && HAVE_LONG_LONG
|
|
case 'q':
|
|
ASSERT_ALWAYS (sizeof (quad_t) == sizeof (long long));
|
|
/*FALLTHRU*/
|
|
#else
|
|
case 'q': ASSERT_FAIL (quad_t not available); break;
|
|
#endif
|
|
#if HAVE_LONG_LONG
|
|
case 'L': * (long long *) p = chars; break;
|
|
#else
|
|
case 'L': ASSERT_FAIL (long long not available); break;
|
|
#endif
|
|
case 'Q': mpq_set_si ((mpq_ptr) p, (long) chars, 1L); break;
|
|
#if HAVE_PTRDIFF_T
|
|
case 't': * (ptrdiff_t *) p = chars; break;
|
|
#else
|
|
case 't': ASSERT_FAIL (ptrdiff_t not available); break;
|
|
#endif
|
|
case 'z': * (size_t *) p = chars; break;
|
|
case 'Z': mpz_set_si ((mpz_ptr) p, (long) chars); break;
|
|
default: ASSERT (0); break;
|
|
}
|
|
}
|
|
goto next;
|
|
|
|
case 'o':
|
|
param.base = 8;
|
|
goto numeric;
|
|
|
|
case 'x':
|
|
case 'X':
|
|
param.base = 16;
|
|
goto numeric;
|
|
|
|
case '0': case '1': case '2': case '3': case '4':
|
|
case '5': case '6': case '7': case '8': case '9':
|
|
param.width = 0;
|
|
do {
|
|
param.width = param.width * 10 + (fchar-'0');
|
|
fchar = *fmt++;
|
|
} while (isdigit (fchar));
|
|
fmt--; /* unget the non-digit */
|
|
break;
|
|
|
|
case '*':
|
|
param.ignore = 1;
|
|
break;
|
|
|
|
default:
|
|
/* something invalid in a % sequence */
|
|
ASSERT (0);
|
|
goto next;
|
|
}
|
|
}
|
|
}
|
|
|
|
done:
|
|
(*__gmp_free_func) (alloc_fmt, alloc_fmt_size);
|
|
return fields;
|
|
}
|