mirror of
https://github.com/tesseract-ocr/tesseract.git
synced 2024-12-28 02:58:17 +08:00
551 lines
15 KiB
C++
551 lines
15 KiB
C++
// Copyright 2006 Google Inc.
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// All Rights Reserved.
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// Author: renn
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//
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// The fscanf, vfscanf and creat functions are implemented so that their
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// functionality is mostly like their stdio counterparts. However, currently
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// these functions do not use any buffering, making them rather slow.
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// File streams are thus processed one character at a time.
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// Although the implementations of the scanf functions do lack a few minor
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// features, they should be sufficient for their use in tesseract.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifdef HAVE_CONFIG_H
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#include "config_auto.h"
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#endif
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#include <cctype>
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#include <cmath>
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#include <cstdarg>
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#include <cstddef>
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#include <cstring>
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#include <climits>
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#include <cstdio>
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#include <limits>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include "scanutils.h"
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#include "tprintf.h"
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enum Flags {
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FL_SPLAT = 0x01, // Drop the value, do not assign
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FL_INV = 0x02, // Character-set with inverse
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FL_WIDTH = 0x04, // Field width specified
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FL_MINUS = 0x08, // Negative number
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};
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enum Ranks {
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RANK_CHAR = -2,
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RANK_SHORT = -1,
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RANK_INT = 0,
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RANK_LONG = 1,
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RANK_LONGLONG = 2,
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RANK_PTR = std::numeric_limits<int>::max() // Special value used for pointers
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};
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const enum Ranks kMinRank = RANK_CHAR;
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const enum Ranks kMaxRank = RANK_LONGLONG;
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const enum Ranks kIntMaxRank = RANK_LONGLONG;
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const enum Ranks kSizeTRank = RANK_LONG;
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const enum Ranks kPtrDiffRank = RANK_LONG;
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enum Bail {
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BAIL_NONE = 0, // No error condition
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BAIL_EOF, // Hit EOF
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BAIL_ERR // Conversion mismatch
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};
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// Helper functions ------------------------------------------------------------
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inline size_t LongBit() {
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return CHAR_BIT * sizeof(long);
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}
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static inline int
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SkipSpace(FILE *s) {
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int p;
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while (isspace(p = fgetc(s)));
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ungetc(p, s); // Make sure next char is available for reading
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return p;
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}
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static inline void
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SetBit(unsigned long *bitmap, unsigned int bit) {
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bitmap[bit/LongBit()] |= 1UL << (bit%LongBit());
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}
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static inline int
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TestBit(unsigned long *bitmap, unsigned int bit) {
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return static_cast<int>(bitmap[bit/LongBit()] >> (bit%LongBit())) & 1;
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}
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static inline int DigitValue(int ch, int base) {
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if (ch >= '0' && ch <= '9') {
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if (base >= 10 || ch <= '7')
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return ch-'0';
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} else if (ch >= 'A' && ch <= 'Z' && base == 16) {
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return ch-'A'+10;
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} else if (ch >= 'a' && ch <= 'z' && base == 16) {
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return ch-'a'+10;
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}
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return -1;
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}
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// IO (re-)implementations -----------------------------------------------------
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static uintmax_t streamtoumax(FILE* s, int base) {
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int minus = 0;
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uintmax_t v = 0;
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int d, c = 0;
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for (c = fgetc(s);
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isspace(static_cast<unsigned char>(c)) && (c != EOF);
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c = fgetc(s)) {}
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// Single optional + or -
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if (c == '-' || c == '+') {
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minus = (c == '-');
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c = fgetc(s);
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}
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// Assign correct base
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if (base == 0) {
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if (c == '0') {
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c = fgetc(s);
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if (c == 'x' || c == 'X') {
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base = 16;
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c = fgetc(s);
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} else {
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base = 8;
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}
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}
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} else if (base == 16) {
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if (c == '0') {
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c = fgetc(s);
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if (c == 'x' || c == 'X') c = fgetc(s);
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}
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}
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// Actual number parsing
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for (; (c != EOF) && (d = DigitValue(c, base)) >= 0; c = fgetc(s))
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v = v*base + d;
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ungetc(c, s);
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return minus ? -v : v;
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}
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static double streamtofloat(FILE* s) {
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int minus = 0;
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int v = 0;
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int d, c = 0;
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int k = 1;
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int w = 0;
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for (c = fgetc(s);
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isspace(static_cast<unsigned char>(c)) && (c != EOF);
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c = fgetc(s));
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// Single optional + or -
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if (c == '-' || c == '+') {
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minus = (c == '-');
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c = fgetc(s);
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}
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// Actual number parsing
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for (; c != EOF && (d = DigitValue(c, 10)) >= 0; c = fgetc(s))
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v = v*10 + d;
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if (c == '.') {
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for (c = fgetc(s); c != EOF && (d = DigitValue(c, 10)) >= 0; c = fgetc(s)) {
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w = w*10 + d;
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k *= 10;
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}
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}
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double f = static_cast<double>(v)
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+ static_cast<double>(w) / static_cast<double>(k);
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if (c == 'e' || c == 'E') {
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c = fgetc(s);
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int expsign = 1;
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if (c == '-' || c == '+') {
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expsign = (c == '-') ? -1 : 1;
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c = fgetc(s);
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}
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int exponent = 0;
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for (; (c != EOF) && (d = DigitValue(c, 10)) >= 0; c = fgetc(s)) {
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exponent = exponent * 10 + d;
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}
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exponent *= expsign;
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f *= pow(10.0, static_cast<double>(exponent));
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}
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ungetc(c, s);
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return minus ? -f : f;
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}
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static int tvfscanf(FILE* stream, const char *format, va_list ap);
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int tfscanf(FILE* stream, const char *format, ...) {
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va_list ap;
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int rv;
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va_start(ap, format);
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rv = tvfscanf(stream, format, ap);
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va_end(ap);
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return rv;
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}
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#ifdef EMBEDDED
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int fscanf(FILE* stream, const char *format, ...) {
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va_list ap;
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int rv;
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va_start(ap, format);
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rv = tvfscanf(stream, format, ap);
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va_end(ap);
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return rv;
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}
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int vfscanf(FILE* stream, const char *format, ...) {
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va_list ap;
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int rv;
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va_start(ap, format);
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rv = tvfscanf(stream, format, ap);
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va_end(ap);
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return rv;
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}
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#endif
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static int tvfscanf(FILE* stream, const char *format, va_list ap) {
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const char *p = format;
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char ch;
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int q = 0;
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uintmax_t val = 0;
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int rank = RANK_INT; // Default rank
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unsigned int width = UINT_MAX;
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int base;
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int flags = 0;
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enum {
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ST_NORMAL, // Ground state
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ST_FLAGS, // Special flags
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ST_WIDTH, // Field width
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ST_MODIFIERS, // Length or conversion modifiers
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ST_MATCH_INIT, // Initial state of %[ sequence
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ST_MATCH, // Main state of %[ sequence
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ST_MATCH_RANGE, // After - in a %[ sequence
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} state = ST_NORMAL;
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char *sarg = nullptr; // %s %c or %[ string argument
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enum Bail bail = BAIL_NONE;
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int converted = 0; // Successful conversions
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unsigned long matchmap[((1 << CHAR_BIT)+(CHAR_BIT * sizeof(long) - 1)) /
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(CHAR_BIT * sizeof(long))];
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int matchinv = 0; // Is match map inverted?
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unsigned char range_start = 0;
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off_t start_off = ftell(stream);
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// Skip leading spaces
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SkipSpace(stream);
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while ((ch = *p++) && !bail) {
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switch (state) {
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case ST_NORMAL:
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if (ch == '%') {
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state = ST_FLAGS;
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flags = 0; rank = RANK_INT; width = UINT_MAX;
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} else if (isspace(static_cast<unsigned char>(ch))) {
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SkipSpace(stream);
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} else {
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if (fgetc(stream) != ch)
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bail = BAIL_ERR; // Match failure
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}
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break;
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case ST_FLAGS:
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if (ch == '*') {
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flags |= FL_SPLAT;
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} else if ('0' <= ch && ch <= '9') {
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width = (ch-'0');
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state = ST_WIDTH;
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flags |= FL_WIDTH;
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} else {
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state = ST_MODIFIERS;
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p--; // Process this character again
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}
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break;
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case ST_WIDTH:
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if (ch >= '0' && ch <= '9') {
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width = width*10+(ch-'0');
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} else {
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state = ST_MODIFIERS;
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p--; // Process this character again
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}
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break;
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case ST_MODIFIERS:
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switch (ch) {
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// Length modifiers - nonterminal sequences
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case 'h':
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rank--; // Shorter rank
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break;
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case 'l':
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rank++; // Longer rank
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break;
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case 'j':
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rank = kIntMaxRank;
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break;
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case 'z':
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rank = kSizeTRank;
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break;
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case 't':
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rank = kPtrDiffRank;
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break;
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case 'L':
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case 'q':
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rank = RANK_LONGLONG; // long double/long long
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break;
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default:
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// Output modifiers - terminal sequences
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state = ST_NORMAL; // Next state will be normal
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if (rank < kMinRank) // Canonicalize rank
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rank = kMinRank;
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else if (rank > kMaxRank)
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rank = kMaxRank;
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switch (ch) {
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case 'P': // Upper case pointer
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case 'p': // Pointer
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rank = RANK_PTR;
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base = 0;
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goto scan_int;
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case 'i': // Base-independent integer
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base = 0;
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goto scan_int;
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case 'd': // Decimal integer
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base = 10;
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goto scan_int;
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case 'o': // Octal integer
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base = 8;
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goto scan_int;
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case 'u': // Unsigned decimal integer
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base = 10;
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goto scan_int;
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case 'x': // Hexadecimal integer
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case 'X':
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base = 16;
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goto scan_int;
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case 'n': // Number of characters consumed
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val = ftell(stream) - start_off;
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goto set_integer;
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scan_int:
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q = SkipSpace(stream);
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if (q <= 0) {
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bail = BAIL_EOF;
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break;
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}
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val = streamtoumax(stream, base);
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// fall through
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set_integer:
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if (!(flags & FL_SPLAT)) {
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converted++;
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switch(rank) {
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case RANK_CHAR:
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*va_arg(ap, unsigned char *)
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= static_cast<unsigned char>(val);
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break;
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case RANK_SHORT:
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*va_arg(ap, unsigned short *)
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= static_cast<unsigned short>(val);
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break;
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case RANK_INT:
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*va_arg(ap, unsigned int *)
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= static_cast<unsigned int>(val);
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break;
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case RANK_LONG:
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*va_arg(ap, unsigned long *)
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= static_cast<unsigned long>(val);
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break;
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case RANK_LONGLONG:
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*va_arg(ap, unsigned long long *)
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= static_cast<unsigned long long>(val);
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break;
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case RANK_PTR:
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*va_arg(ap, void **)
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= reinterpret_cast<void *>(static_cast<uintptr_t>(val));
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break;
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}
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}
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break;
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case 'f': // Preliminary float value parsing
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case 'g':
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case 'G':
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case 'e':
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case 'E':
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q = SkipSpace(stream);
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if (q <= 0) {
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bail = BAIL_EOF;
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break;
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}
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{
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double fval = streamtofloat(stream);
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if (!(flags & FL_SPLAT)) {
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if (rank == RANK_INT)
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*va_arg(ap, float *) = static_cast<float>(fval);
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else if (rank == RANK_LONG)
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*va_arg(ap, double *) = static_cast<double>(fval);
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converted++;
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}
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}
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break;
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case 'c': // Character
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width = (flags & FL_WIDTH) ? width : 1; // Default width == 1
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sarg = va_arg(ap, char *);
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while (width--) {
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if ((q = fgetc(stream)) <= 0) {
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bail = BAIL_EOF;
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break;
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}
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if (!(flags & FL_SPLAT)) {
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*sarg++ = q;
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converted++;
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}
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}
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break;
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case 's': // String
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{
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if (!(flags & FL_SPLAT)) {
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sarg = va_arg(ap, char *);
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}
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unsigned length = 0;
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while (width--) {
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q = fgetc(stream);
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if (isspace(static_cast<unsigned char>(q)) || q <= 0) {
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ungetc(q, stream);
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break;
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}
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if (!(flags & FL_SPLAT)) {
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sarg[length] = q;
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}
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length++;
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}
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if (length == 0) {
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bail = BAIL_EOF;
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} else if (!(flags & FL_SPLAT)) {
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sarg[length] = '\0'; // Terminate output
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converted++;
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}
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}
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break;
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case '[': // Character range
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sarg = va_arg(ap, char *);
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state = ST_MATCH_INIT;
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matchinv = 0;
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memset(matchmap, 0, sizeof matchmap);
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break;
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case '%': // %% sequence
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if (fgetc(stream) != '%')
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bail = BAIL_ERR;
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break;
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default: // Anything else
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bail = BAIL_ERR; // Unknown sequence
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break;
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}
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}
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break;
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case ST_MATCH_INIT: // Initial state for %[ match
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if (ch == '^' && !(flags & FL_INV)) {
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matchinv = 1;
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} else {
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SetBit(matchmap, static_cast<unsigned char>(ch));
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state = ST_MATCH;
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}
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break;
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case ST_MATCH: // Main state for %[ match
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if (ch == ']') {
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goto match_run;
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} else if (ch == '-') {
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range_start = static_cast<unsigned char>(ch);
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state = ST_MATCH_RANGE;
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} else {
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SetBit(matchmap, static_cast<unsigned char>(ch));
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}
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break;
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case ST_MATCH_RANGE: // %[ match after -
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if (ch == ']') {
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SetBit(matchmap, static_cast<unsigned char>('-'));
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goto match_run;
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} else {
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int i;
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for (i = range_start ; i < (static_cast<unsigned char>(ch)) ; i++)
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SetBit(matchmap, i);
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state = ST_MATCH;
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}
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break;
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match_run: // Match expression finished
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char* oarg = sarg;
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while (width) {
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q = fgetc(stream);
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unsigned char qc = static_cast<unsigned char>(q);
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if (q <= 0 || !(TestBit(matchmap, qc)^matchinv)) {
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ungetc(q, stream);
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break;
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}
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if (!(flags & FL_SPLAT)) *sarg = q;
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sarg++;
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}
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if (oarg == sarg) {
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bail = (q <= 0) ? BAIL_EOF : BAIL_ERR;
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} else if (!(flags & FL_SPLAT)) {
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*sarg = '\0';
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converted++;
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}
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break;
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}
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}
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if (bail == BAIL_EOF && !converted)
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converted = -1; // Return EOF (-1)
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return converted;
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}
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#ifdef EMBEDDED
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int creat(const char *pathname, mode_t mode) {
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return open(pathname, O_CREAT | O_TRUNC | O_WRONLY, mode);
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}
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#endif // EMBEDDED
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