Filled out the implementation of fscanf and _cscanf.
This commit is contained in:
C. Scott Ananian
Alexandre Julliard
parent
91f3fc7d59
commit
48a87e6107
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@ -179,6 +179,17 @@ int _ungetch(int c)
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return retval;
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}
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/* helper function for _cscanf. Returns the value of character c in the
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* given base, or -1 if the given character is not a digit of the base.
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*/
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static int char2digit(char c, int base) {
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if ((c>='0') && (c<='9') && (c<='0'+base-1)) return (c-'0');
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if (base<=10) return -1;
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if ((c>='A') && (c<='Z') && (c<='A'+base-11)) return (c-'A'+10);
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if ((c>='a') && (c<='z') && (c<='a'+base-11)) return (c-'a'+10);
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return -1;
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}
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/*********************************************************************
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* _cscanf (MSVCRT.@)
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*/
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@ -194,99 +205,224 @@ int _cscanf(const char* format, ...)
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LOCK_CONSOLE;
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nch = _getch();
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while (*format) {
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if (*format == ' ') {
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/* a whitespace character in the format string causes scanf to read,
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* but not store, all consecutive white-space characters in the input
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* up to the next non-white-space character. One white space character
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* in the input matches any number (including zero) and combination of
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* white-space characters in the input. */
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if (isspace(*format)) {
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/* skip whitespace */
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while ((nch!=MSVCRT_EOF) && isspace(nch))
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nch = _getch();
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}
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/* a format specification causes scanf to read and convert characters
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* in the input into values of a specified type. The value is assigned
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* to an argument in the argument list. Format specifications have
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* the form %[*][width][{h | l | I64 | L}]type */
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/* FIXME: unimplemented: h/l/I64/L modifiers and some type specs. */
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else if (*format == '%') {
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int st = 0;
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int st = 0; int suppress = 0; int width = 0;
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int base, number_signed;
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format++;
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/* look for leading asterisk, which means 'suppress assignment of
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* this field'. */
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if (*format=='*') {
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format++;
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suppress=1;
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}
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/* look for width specification */
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while (isdigit(*format)) {
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width*=10;
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width+=*format++ - '0';
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}
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if (width==0) width=-1; /* no width spec seen */
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switch(*format) {
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case 'd': { /* read an integer */
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int*val = va_arg(ap, int*);
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int cur = 0;
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case '%': /* read a percent symbol */
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if (nch!='%') break;
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nch = _getch();
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break;
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case 'x':
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case 'X': /* hexadecimal integer. */
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base = 16; number_signed = 0;
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goto number;
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case 'o': /* octal integer */
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base = 8; number_signed = 0;
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goto number;
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case 'u': /* unsigned decimal integer */
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base = 10; number_signed = 0;
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goto number;
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case 'd': /* signed decimal integer */
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base = 10; number_signed = 1;
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goto number;
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case 'i': /* generic integer */
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base = 0; number_signed = 1;
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number: {
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/* read an integer */
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int*val = suppress ? NULL : va_arg(ap, int*);
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int cur = 0; int negative = 0; int seendigit=0;
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/* skip initial whitespace */
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while ((nch!=MSVCRT_EOF) && isspace(nch))
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nch = _getch();
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/* get sign and first digit */
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if (nch == '-') {
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/* get sign */
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if (number_signed && (nch == '-' || nch == '+')) {
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negative = (nch=='-');
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nch = _getch();
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if (isdigit(nch))
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cur = -(nch - '0');
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else break;
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} else {
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if (isdigit(nch))
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cur = nch - '0';
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else break;
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if (width>0) width--;
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}
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nch = _getch();
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/* look for leading indication of base */
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if (width!=0 && nch == '0') {
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nch = _getch();
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if (width>0) width--;
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seendigit=1;
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if (width!=0 && (nch=='x' || nch=='X')) {
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if (base==0)
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base=16;
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if (base==16) {
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nch = _getch();
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if (width>0) width--;
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seendigit=0;
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}
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} else if (base==0)
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base = 8;
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}
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if (base==0)
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base=10;
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/* throw away leading zeros */
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while (width!=0 && nch=='0') {
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nch = _getch();
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if (width>0) width--;
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seendigit=1;
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}
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/* get first digit. Keep working copy negative, as the
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* range of negative numbers in two's complement notation
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* is one larger than the range of positive numbers. */
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if (width!=0 && char2digit(nch, base)!=-1) {
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cur = -char2digit(nch, base);
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nch = _getch();
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if (width>0) width--;
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seendigit=1;
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}
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/* read until no more digits */
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while ((nch!=MSVCRT_EOF) && isdigit(nch)) {
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cur = cur*10 + (nch - '0');
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while (width!=0 && (nch!=MSVCRT_EOF) && isdigit(nch)) {
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cur = cur*base + char2digit(nch, base);
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nch = _getch();
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if (width>0) width--;
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seendigit=1;
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}
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/* negate parsed number if non-negative */
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if (!negative) cur=-cur;
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/* okay, done! */
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if (!seendigit) break; /* not a valid number */
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st = 1;
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*val = cur;
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if (!suppress) *val = cur;
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}
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break;
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case 'f': { /* read a float */
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float*val = va_arg(ap, float*);
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case 'e':
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case 'E':
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case 'f':
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case 'g':
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case 'G': { /* read a float */
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float*val = suppress ? NULL : va_arg(ap, float*);
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float cur = 0;
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int negative = 0;
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/* skip initial whitespace */
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while ((nch!=MSVCRT_EOF) && isspace(nch))
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nch = _getch();
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/* get sign and first digit */
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if (nch == '-') {
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/* get sign. */
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if (nch == '-' || nch == '+') {
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negative = (nch=='-');
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if (width>0) width--;
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if (width==0) break;
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nch = _getch();
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if (isdigit(nch))
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cur = -(nch - '0');
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else break;
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} else {
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if (isdigit(nch))
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cur = nch - '0';
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else break;
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}
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/* get first digit. */
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if (!isdigit(nch)) break;
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cur = (nch - '0') * (negative ? -1 : 1);
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nch = _getch();
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if (width>0) width--;
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/* read until no more digits */
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while ((nch!=MSVCRT_EOF) && isdigit(nch)) {
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while (width!=0 && (nch!=MSVCRT_EOF) && isdigit(nch)) {
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cur = cur*10 + (nch - '0');
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nch = _getch();
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if (width>0) width--;
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}
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if (nch == '.') {
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/* handle decimals */
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/* handle decimals */
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if (width!=0 && nch == '.') {
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float dec = 1;
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nch = _getch();
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while ((nch!=MSVCRT_EOF) && isdigit(nch)) {
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if (width>0) width--;
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while (width!=0 && (nch!=MSVCRT_EOF) && isdigit(nch)) {
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dec /= 10;
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cur += dec * (nch - '0');
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nch = _getch();
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if (width>0) width--;
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}
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}
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/* handle exponent */
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if (width!=0 && (nch == 'e' || nch == 'E')) {
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int exponent = 0, negexp = 0;
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float expcnt;
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nch = _getch();
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if (width>0) width--;
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/* possible sign on the exponent */
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if (width!=0 && (nch=='+' || nch=='-')) {
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negexp = (nch=='-');
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nch = _getch();
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if (width>0) width--;
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}
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/* exponent digits */
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while (width!=0 && (nch!=MSVCRT_EOF) && isdigit(nch)) {
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exponent *= 10;
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exponent += (nch - '0');
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nch = _getch();
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if (width>0) width--;
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}
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/* update 'cur' with this exponent. */
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expcnt = negexp ? .1 : 10;
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while (exponent!=0) {
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if (exponent&1)
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cur*=expcnt;
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exponent/=2;
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expcnt=expcnt*expcnt;
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}
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}
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st = 1;
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*val = cur;
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if (!suppress) *val = cur;
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}
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break;
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case 's': { /* read a word */
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char*str = va_arg(ap, char*);
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char*str = suppress ? NULL : va_arg(ap, char*);
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char*sptr = str;
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/* skip initial whitespace */
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while ((nch!=MSVCRT_EOF) && isspace(nch))
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nch = _getch();
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/* read until whitespace */
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while ((nch!=MSVCRT_EOF) && !isspace(nch)) {
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*sptr++ = nch; st++;
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while (width!=0 && (nch!=MSVCRT_EOF) && !isspace(nch)) {
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if (!suppress) *sptr++ = nch;
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st++;
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nch = _getch();
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if (width>0) width--;
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}
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/* terminate */
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*sptr = 0;
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if (!suppress) *sptr = 0;
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TRACE("read word: %s\n", str);
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}
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break;
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default: FIXME("unhandled: %%%c\n", *format);
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/* From spec: "if a percent sign is followed by a character
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* that has no meaning as a format-control character, that
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* character and the following characters are treated as
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* an ordinary sequence of characters, that is, a sequence
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* of characters that must match the input. For example,
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* to specify that a percent-sign character is to be input,
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* use %%."
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* LEAVING AS-IS because we catch bugs better that way. */
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}
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if (st) rd++;
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if (st && !suppress) rd++;
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else break;
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}
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/* a non-white-space character causes scanf to read, but not store,
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* a matching non-white-space character. */
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else {
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/* check for character match */
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if (nch == *format)
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@ -1553,8 +1553,23 @@ int MSVCRT_fsetpos(MSVCRT_FILE* file, MSVCRT_fpos_t *pos)
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return _lseek(file->_file,*pos,SEEK_SET);
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}
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/* helper function for fscanf. Returns the value of character c in the
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* given base, or -1 if the given character is not a digit of the base.
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*/
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static int char2digit(char c, int base) {
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if ((c>='0') && (c<='9') && (c<='0'+base-1)) return (c-'0');
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if (base<=10) return -1;
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if ((c>='A') && (c<='Z') && (c<='A'+base-11)) return (c-'A'+10);
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if ((c>='a') && (c<='z') && (c<='a'+base-11)) return (c-'a'+10);
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return -1;
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}
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/*********************************************************************
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* fscanf (MSVCRT.@)
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* Implemented based on
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* http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccore98/html/_crt_format_specification_fields_.2d_.scanf_and_wscanf_functions.asp
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* Extended by C. Scott Ananian <cananian@alumni.princeton.edu> to handle
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* more types of format spec.
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*/
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int MSVCRT_fscanf(MSVCRT_FILE* file, const char *format, ...)
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{
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@ -1567,99 +1582,224 @@ int MSVCRT_fscanf(MSVCRT_FILE* file, const char *format, ...)
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nch = MSVCRT_fgetc(file);
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va_start(ap, format);
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while (*format) {
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if (*format == ' ') {
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/* a whitespace character in the format string causes scanf to read,
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* but not store, all consecutive white-space characters in the input
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* up to the next non-white-space character. One white space character
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* in the input matches any number (including zero) and combination of
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* white-space characters in the input. */
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if (isspace(*format)) {
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/* skip whitespace */
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while ((nch!=MSVCRT_EOF) && isspace(nch))
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nch = MSVCRT_fgetc(file);
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}
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/* a format specification causes scanf to read and convert characters
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* in the input into values of a specified type. The value is assigned
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* to an argument in the argument list. Format specifications have
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* the form %[*][width][{h | l | I64 | L}]type */
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/* FIXME: unimplemented: h/l/I64/L modifiers and some type specs. */
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else if (*format == '%') {
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int st = 0;
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int st = 0; int suppress = 0; int width = 0;
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int base, number_signed;
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format++;
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/* look for leading asterisk, which means 'suppress assignment of
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* this field'. */
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if (*format=='*') {
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format++;
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suppress=1;
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}
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/* look for width specification */
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while (isdigit(*format)) {
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width*=10;
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width+=*format++ - '0';
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}
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if (width==0) width=-1; /* no width spec seen */
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switch(*format) {
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case 'd': { /* read an integer */
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int*val = va_arg(ap, int*);
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int cur = 0;
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case '%': /* read a percent symbol */
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if (nch!='%') break;
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nch = MSVCRT_fgetc(file);
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break;
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case 'x':
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case 'X': /* hexadecimal integer. */
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base = 16; number_signed = 0;
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goto number;
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case 'o': /* octal integer */
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base = 8; number_signed = 0;
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goto number;
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case 'u': /* unsigned decimal integer */
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base = 10; number_signed = 0;
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goto number;
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case 'd': /* signed decimal integer */
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base = 10; number_signed = 1;
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goto number;
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case 'i': /* generic integer */
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base = 0; number_signed = 1;
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number: {
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/* read an integer */
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int*val = suppress ? NULL : va_arg(ap, int*);
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int cur = 0; int negative = 0; int seendigit=0;
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/* skip initial whitespace */
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while ((nch!=MSVCRT_EOF) && isspace(nch))
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nch = MSVCRT_fgetc(file);
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/* get sign and first digit */
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if (nch == '-') {
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/* get sign */
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if (number_signed && (nch == '-' || nch == '+')) {
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negative = (nch=='-');
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nch = MSVCRT_fgetc(file);
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if (isdigit(nch))
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cur = -(nch - '0');
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else break;
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} else {
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if (isdigit(nch))
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cur = nch - '0';
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else break;
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if (width>0) width--;
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}
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nch = MSVCRT_fgetc(file);
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/* look for leading indication of base */
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if (width!=0 && nch == '0') {
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nch = MSVCRT_fgetc(file);
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if (width>0) width--;
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seendigit=1;
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if (width!=0 && (nch=='x' || nch=='X')) {
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if (base==0)
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base=16;
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if (base==16) {
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nch = MSVCRT_fgetc(file);
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if (width>0) width--;
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seendigit=0;
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}
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} else if (base==0)
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base = 8;
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}
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if (base==0)
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base=10;
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/* throw away leading zeros */
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while (width!=0 && nch=='0') {
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nch = MSVCRT_fgetc(file);
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if (width>0) width--;
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seendigit=1;
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}
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/* get first digit. Keep working copy negative, as the
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* range of negative numbers in two's complement notation
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* is one larger than the range of positive numbers. */
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if (width!=0 && char2digit(nch, base)!=-1) {
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cur = -char2digit(nch, base);
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nch = MSVCRT_fgetc(file);
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if (width>0) width--;
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seendigit=1;
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}
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/* read until no more digits */
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while ((nch!=MSVCRT_EOF) && isdigit(nch)) {
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cur = cur*10 + (nch - '0');
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while (width!=0 && (nch!=MSVCRT_EOF) && isdigit(nch)) {
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cur = cur*base + char2digit(nch, base);
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nch = MSVCRT_fgetc(file);
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if (width>0) width--;
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seendigit=1;
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}
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/* negate parsed number if non-negative */
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if (!negative) cur=-cur;
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/* okay, done! */
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if (!seendigit) break; /* not a valid number */
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st = 1;
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*val = cur;
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if (!suppress) *val = cur;
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}
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break;
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case 'f': { /* read a float */
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float*val = va_arg(ap, float*);
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case 'e':
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case 'E':
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case 'f':
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case 'g':
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case 'G': { /* read a float */
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float*val = suppress ? NULL : va_arg(ap, float*);
|
||||
float cur = 0;
|
||||
int negative = 0;
|
||||
/* skip initial whitespace */
|
||||
while ((nch!=MSVCRT_EOF) && isspace(nch))
|
||||
nch = MSVCRT_fgetc(file);
|
||||
/* get sign and first digit */
|
||||
if (nch == '-') {
|
||||
/* get sign. */
|
||||
if (nch == '-' || nch == '+') {
|
||||
negative = (nch=='-');
|
||||
if (width>0) width--;
|
||||
if (width==0) break;
|
||||
nch = MSVCRT_fgetc(file);
|
||||
if (isdigit(nch))
|
||||
cur = -(nch - '0');
|
||||
else break;
|
||||
} else {
|
||||
if (isdigit(nch))
|
||||
cur = nch - '0';
|
||||
else break;
|
||||
}
|
||||
/* get first digit. */
|
||||
if (!isdigit(nch)) break;
|
||||
cur = (nch - '0') * (negative ? -1 : 1);
|
||||
nch = MSVCRT_fgetc(file);
|
||||
if (width>0) width--;
|
||||
/* read until no more digits */
|
||||
while ((nch!=MSVCRT_EOF) && isdigit(nch)) {
|
||||
while (width!=0 && (nch!=MSVCRT_EOF) && isdigit(nch)) {
|
||||
cur = cur*10 + (nch - '0');
|
||||
nch = MSVCRT_fgetc(file);
|
||||
if (width>0) width--;
|
||||
}
|
||||
if (nch == '.') {
|
||||
/* handle decimals */
|
||||
/* handle decimals */
|
||||
if (width!=0 && nch == '.') {
|
||||
float dec = 1;
|
||||
nch = MSVCRT_fgetc(file);
|
||||
while ((nch!=MSVCRT_EOF) && isdigit(nch)) {
|
||||
if (width>0) width--;
|
||||
while (width!=0 && (nch!=MSVCRT_EOF) && isdigit(nch)) {
|
||||
dec /= 10;
|
||||
cur += dec * (nch - '0');
|
||||
nch = MSVCRT_fgetc(file);
|
||||
if (width>0) width--;
|
||||
}
|
||||
}
|
||||
/* handle exponent */
|
||||
if (width!=0 && (nch == 'e' || nch == 'E')) {
|
||||
int exponent = 0, negexp = 0;
|
||||
float expcnt;
|
||||
nch = MSVCRT_fgetc(file);
|
||||
if (width>0) width--;
|
||||
/* possible sign on the exponent */
|
||||
if (width!=0 && (nch=='+' || nch=='-')) {
|
||||
negexp = (nch=='-');
|
||||
nch = MSVCRT_fgetc(file);
|
||||
if (width>0) width--;
|
||||
}
|
||||
/* exponent digits */
|
||||
while (width!=0 && (nch!=MSVCRT_EOF) && isdigit(nch)) {
|
||||
exponent *= 10;
|
||||
exponent += (nch - '0');
|
||||
nch = MSVCRT_fgetc(file);
|
||||
if (width>0) width--;
|
||||
}
|
||||
/* update 'cur' with this exponent. */
|
||||
expcnt = negexp ? .1 : 10;
|
||||
while (exponent!=0) {
|
||||
if (exponent&1)
|
||||
cur*=expcnt;
|
||||
exponent/=2;
|
||||
expcnt=expcnt*expcnt;
|
||||
}
|
||||
}
|
||||
st = 1;
|
||||
*val = cur;
|
||||
if (!suppress) *val = cur;
|
||||
}
|
||||
break;
|
||||
case 's': { /* read a word */
|
||||
char*str = va_arg(ap, char*);
|
||||
char*str = suppress ? NULL : va_arg(ap, char*);
|
||||
char*sptr = str;
|
||||
/* skip initial whitespace */
|
||||
while ((nch!=MSVCRT_EOF) && isspace(nch))
|
||||
nch = MSVCRT_fgetc(file);
|
||||
/* read until whitespace */
|
||||
while ((nch!=MSVCRT_EOF) && !isspace(nch)) {
|
||||
*sptr++ = nch; st++;
|
||||
while (width!=0 && (nch!=MSVCRT_EOF) && !isspace(nch)) {
|
||||
if (!suppress) *sptr++ = nch;
|
||||
st++;
|
||||
nch = MSVCRT_fgetc(file);
|
||||
if (width>0) width--;
|
||||
}
|
||||
/* terminate */
|
||||
*sptr = 0;
|
||||
if (!suppress) *sptr = 0;
|
||||
TRACE("read word: %s\n", str);
|
||||
}
|
||||
break;
|
||||
default: FIXME("unhandled: %%%c\n", *format);
|
||||
/* From spec: "if a percent sign is followed by a character
|
||||
* that has no meaning as a format-control character, that
|
||||
* character and the following characters are treated as
|
||||
* an ordinary sequence of characters, that is, a sequence
|
||||
* of characters that must match the input. For example,
|
||||
* to specify that a percent-sign character is to be input,
|
||||
* use %%."
|
||||
* LEAVING AS-IS because we catch bugs better that way. */
|
||||
}
|
||||
if (st) rd++;
|
||||
if (st && !suppress) rd++;
|
||||
else break;
|
||||
}
|
||||
/* a non-white-space character causes scanf to read, but not store,
|
||||
* a matching non-white-space character. */
|
||||
else {
|
||||
/* check for character match */
|
||||
if (nch == *format)
|
||||
|
|
@ -1668,10 +1808,10 @@ int MSVCRT_fscanf(MSVCRT_FILE* file, const char *format, ...)
|
|||
}
|
||||
format++;
|
||||
}
|
||||
va_end(ap);
|
||||
if (nch!=MSVCRT_EOF) {
|
||||
WARN("need ungetch\n");
|
||||
FIXME("need ungetch\n");
|
||||
}
|
||||
va_end(ap);
|
||||
TRACE("returning %d\n", rd);
|
||||
return rd;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue