418 lines
12 KiB
C
418 lines
12 KiB
C
/*
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function for format read from any source
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Siemargl formats as http://www.cplusplus.com/reference/cstdio/scanf/, no wchar though
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http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap05.html is used too
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todo:
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[characters], [^characters]
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-%n nothing scanned, filled only if good result
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-%d, i, u, o, x, p read similar - detect base by prefix 0 or 0x
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-%a
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-can overflow unsigned as signed
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-radix point always '.', no LOCALEs
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*/
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#include <stdio.h>
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#include <ctype.h>
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#include <math.h>
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#include <stdarg.h>
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typedef int (*virtual_getc)(void *sp, const void *obj);
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typedef void (*virtual_ungetc)(void *sp, int c, const void *obj);
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enum flags_t
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{
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flag_unsigned = 0x02,
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flag_register = 0x04,
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flag_plus = 0x08,
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flag_left_just = 0x10,
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flag_lead_zeros = 0x20,
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flag_space_plus = 0x40,
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flag_hash_sign = 0x80,
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flag_point = 0x100
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};
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int try_parse_real(long double *real, int ch, const void *src, void *save, virtual_getc vgetc, virtual_ungetc vungetc)
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// returns 1 if OK, -1 == EOF, -2 parse broken
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{
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int sign = 1, have_digits = 0;
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long long div;
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if (ch == '+')
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{
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ch = vgetc(save, src);
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if (ch == EOF) return EOF;
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} else
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if (ch == '-')
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{
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sign = -1;
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ch = vgetc(save, src);
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if (ch == EOF) return EOF;
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};
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*real = 0.0;
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for (;;) // mantissa before point
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{
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// test ch is valid
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if (isdigit(ch))
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{
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*real = *real * 10 + ch - '0';
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have_digits++;
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ch = vgetc(save, src);
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if (ch == EOF || isspace(ch)) break; // ok, just finish num
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} else
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if (ch == '.' || ch == 'E' || ch == 'e')
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{
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break; // ok
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}
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else
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{
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vungetc(save, ch, src);
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break;
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}
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}
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if (ch != '.' && ch != 'E' && ch != 'e') // ok, just integer part
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{
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*real *= sign;
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if (have_digits)
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return 1;
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else
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return -2;
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}
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if(ch == '.')
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{
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ch = vgetc(save, src);
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div = 10; // use as divisor
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for (;;) // mantissa after point
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{
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// test ch is valid
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if (isdigit(ch))
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{
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*real += (double)(ch - '0') / div;
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div *= 10;
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have_digits++;
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ch = vgetc(save, src);
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if (ch == EOF || isspace(ch)) break; // ok, just finish num
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} else
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if (ch == 'E' || ch == 'e')
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{
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break; // ok
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}
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else
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{
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vungetc(save, ch, src);
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break;
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}
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}
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if (ch != 'E' && ch != 'e') // ok, real as XX.YY
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{
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*real *= sign;
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if (have_digits)
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return 1;
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else
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return -2;
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}
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}
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ch = vgetc(save, src);
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*real *= sign;
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// exponent
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sign = 1;
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if (ch == '+')
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{
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ch = vgetc(save, src);
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if (ch == EOF) return EOF;
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} else
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if (ch == '-')
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{
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sign = -1;
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ch = vgetc(save, src);
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if (ch == EOF) return EOF;
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};
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div = 0;
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for (;;)
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{
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// test ch is valid
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if (isdigit(ch))
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{
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div = div * 10 + ch - '0';
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ch = vgetc(save, src);
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if (ch == EOF || isspace(ch)) break; // ok, just finish num
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}
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else
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{
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vungetc(save, ch, src);
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break;
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}
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}
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div *= sign;
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*real *= pow(10, div);
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return 1;
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}
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int try_parse_int(long long *digit, int ch, const void *src, void *save, virtual_getc vgetc, virtual_ungetc vungetc)
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{
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int sign = 1, base = 10, have_digits = 0;
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if (ch == '+')
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{
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ch = vgetc(save, src);
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if (ch == EOF) return EOF;
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} else
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if (ch == '-')
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{
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sign = -1;
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ch = vgetc(save, src);
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if (ch == EOF) return EOF;
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};
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if (ch == '0') // octal or hex, read next
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{
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base = 8;
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ch = vgetc(save, src);
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if (ch == EOF || isspace(ch))
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have_digits++;
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else
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if (ch == 'x' || ch == 'X')
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{
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base = 16;
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ch = vgetc(save, src);
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if (ch == EOF) return EOF;
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}
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}
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*digit = 0;
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for (;;)
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{
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// test ch is valid
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if ((isdigit(ch) && base == 10) ||
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(isdigit(ch) && base == 8 && ch < '8') ||
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(isxdigit(ch) && base == 16))
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{
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if (base == 16)
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{
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if (ch <= '9') ch-= '0';
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else
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if (ch <= 'F') ch = 10 + ch - 'A';
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else
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ch = 10 + ch - 'a';
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}
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else
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ch -= '0';
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*digit = *digit * base + ch;
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have_digits++;
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ch = vgetc(save, src);
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if (ch == EOF || isspace(ch)) break; // ok, just finish num
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}
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else if (ch == EOF || isspace(ch))
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break;
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else
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{
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vungetc(save, ch, src);
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break;
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}
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}
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*digit *= sign;
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if (have_digits)
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return 1;
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else
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return -2;
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}
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int format_scan(const void *src, const char *fmt, va_list argp, virtual_getc vgetc, virtual_ungetc vungetc)
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{
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int i;
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int length;
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int fmt1, fmt2; // width, precision
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size_t pos, posc;
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const char *fmtc; // first point to %, fmtc points to specifier
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int ch;
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int format_flag;
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int flag_long; // 2 = long double or long long int or wchar
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int *point_to_n = NULL, nread = 0;
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int flags; // parsed flags
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int save = 0;
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char *arg_str;
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int *arg_int;
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long *arg_long;
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long long *arg_longlong;
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float *arg_float;
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double *arg_double;
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long double *arg_longdouble;
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long long digit;
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long double real;
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pos = 0;
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while(*fmt)
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{
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while (*fmt && isspace(*fmt)) fmt++; // skip paces in format str
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if (*fmt != '%') // usual char
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{
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ch = vgetc(&save, src);
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if (ch != *fmt++) // char not match format
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{
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vungetc(&save, ch, src);
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break;
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}
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pos++;
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continue;
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}
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if (*(fmt + 1) == '%') // %%
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{
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ch = vgetc(&save, src);
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if (ch != '%') // char not match format
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{
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vungetc(&save, ch, src);
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break;
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}
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pos++;
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fmt += 2;
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continue;
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}
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//checking to containg format in the string
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fmtc = fmt;
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posc = pos;
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flags = 0;
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format_flag = 0;
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flag_long = 0; // 2 = long double or long long int or wchar
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while(*fmtc != '\0' && !format_flag) // searching end of format
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{
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fmtc++; posc++;
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switch( *fmtc )
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{
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case 'a':
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format_flag = 1;
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flags |= flag_unsigned;
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break;
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case 'c': case 'd': case 'i': case 'e': case 'f': case 'g': case 's': case 'n':
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format_flag = 1;
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break;
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case 'l':
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flag_long = flag_long ? 2 : 1; // ll.eq.L
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break;
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case 'L':
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flag_long = 2;
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break;
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case 'o': case 'u': case 'x': case 'p':
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format_flag = 1;
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flags |= flag_unsigned;
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break;
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case '*': case '.': // just skip
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break;
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default:
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if(isdigit(*fmtc)) break;
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goto exit_me; // non format char found - user error
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}
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}
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if (format_flag == 0)
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{
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goto exit_me; // format char not found - user error
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}
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fmt1 = 0;
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fmt2 = 0;
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if (posc - pos > 1) // try to read width, precision
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{
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fmt++;
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for(i = pos + 1; i < posc; i++)
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{
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switch(*fmt)
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{
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case '0':
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if(fmt1 == 0 && (flags & flag_point) == 0) flags |= flag_lead_zeros;
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case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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if ((flags & flag_point) == 0)
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fmt1 = fmt1 * 10 + (*fmt -'0');
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else
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fmt2 = fmt2 * 10 + (*fmt -'0');
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break;
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case '*': // ignoring
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break;
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case '.':
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flags |= flag_point;
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break;
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case 'l': case 'L': // valid chars - skip
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break;
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default: // must be error
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goto exit_me; // format char not found - user error
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}
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fmt++;
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}
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}
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// do real work - format arguments values
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// skip input spaces
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do {
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ch = vgetc(&save, src);
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if (ch == EOF) goto exit_me;
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} while (isspace(ch));
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switch(*fmtc)
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{
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case 'n':
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point_to_n = va_arg(argp, int*);
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vungetc(&save, ch, src);
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break;
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case 'c': // read width chars, ever spaces
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arg_str = va_arg(argp, char*);
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if (fmt1 == 0) length = 1;
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else length = fmt1;
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for (i = 0; i < length;)
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{
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*arg_str++ = ch; i++;
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ch = vgetc(&save, src);
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if (ch == EOF) break;
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}
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if (i < length) goto exit_me; // not enough chars
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break;
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case 's':
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arg_str = va_arg(argp, char*);
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if (fmt1 == 0) length = 4095; // max string scan 4096
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else length = fmt1;
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for (i = 0; i < length; i++)
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{
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*arg_str++ = ch;
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ch = vgetc(&save, src);
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if (ch == EOF || isspace(ch)) break; // ok, just finish string
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}
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*arg_str++ = '\0';
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break;
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case 'd': case 'i': case 'u':
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case 'o': case 'p': case 'x':
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i = try_parse_int(&digit, ch, src, &save, vgetc, vungetc);
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if (i < 0) goto exit_me;
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if (flag_long == 0) { arg_int = va_arg(argp, int*); *arg_int = (int)digit; } else
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if (flag_long == 1) { arg_long = va_arg(argp, long*); *arg_long = (long)digit; } else
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if (flag_long == 2) { arg_longlong = va_arg(argp, long long*); *arg_longlong = digit; }
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break;
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case 'a': case 'A': case 'f': case 'F':
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case 'e': case 'E':
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case 'g': case 'G':
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i = try_parse_real(&real, ch, src, &save, vgetc, vungetc);
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if (i < 0) goto exit_me;
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if (flag_long == 0) { arg_float = va_arg(argp, float*); *arg_float = (float)real; } else
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if (flag_long == 1) { arg_double = va_arg(argp, double*); *arg_double = (double)real; } else
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if (flag_long == 2) { arg_longdouble = va_arg(argp, long double*); *arg_longdouble = real; }
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break;
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}
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fmt = fmtc + 1;
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nread++;
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}
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exit_me:
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if (point_to_n) *point_to_n = nread;
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return nread;
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}
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