547 lines
10 KiB
C
547 lines
10 KiB
C
/*
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* doscan.c - scan formatted input
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*/
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/* $Id$ */
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <stdarg.h>
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#include "doscan.h"
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#if ACKCONF_WANT_STDIO
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#if _EM_WSIZE == _EM_PSIZE
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#define set_pointer(flags) /* nothing */
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#elif _EM_LSIZE == _EM_PSIZE
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#define set_pointer(flags) (flags |= FL_LONG)
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#else
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#error garbage pointer size
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#define set_pointer(flags) /* compilation might continue */
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#endif
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#define NUMLEN 512
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#define NR_CHARS 256
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static char Xtable[NR_CHARS];
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static char inp_buf[NUMLEN];
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int (*_doscan_get)(void);
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void (*_doscan_unget)(int c);
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/* Collect a number of characters which constitite an ordinal number.
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* When the type is 'i', the base can be 8, 10, or 16, depending on the
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* first 1 or 2 characters. This means that the base must be adjusted
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* according to the format of the number. At the end of the function, base
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* is then set to 0, so strtol() will get the right argument.
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*/
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static char* o_collect(register int c, char type, int width, int* basep)
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{
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register char* bufp = inp_buf;
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register int base;
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switch (type)
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{
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case 'i': /* i means octal, decimal or hexadecimal */
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case 'p':
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case 'x':
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case 'X':
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base = 16;
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break;
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case 'd':
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case 'u':
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base = 10;
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break;
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case 'o':
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base = 8;
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break;
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case 'b':
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base = 2;
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break;
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}
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if (c == '-' || c == '+')
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{
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*bufp++ = c;
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if (--width)
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c = _doscan_get();
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}
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if (width && c == '0' && base == 16)
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{
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*bufp++ = c;
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if (--width)
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c = _doscan_get();
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if (c != 'x' && c != 'X')
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{
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if (type == 'i')
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base = 8;
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}
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else if (width)
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{
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*bufp++ = c;
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if (--width)
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c = _doscan_get();
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}
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}
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else if (type == 'i')
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base = 10;
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while (width)
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{
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if (((base == 10) && isdigit(c))
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|| ((base == 16) && isxdigit(c))
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|| ((base == 8) && isdigit(c) && (c < '8'))
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|| ((base == 2) && isdigit(c) && (c < '2')))
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{
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*bufp++ = c;
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if (--width)
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c = _doscan_get();
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}
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else
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break;
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}
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if (width && c != EOF)
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_doscan_unget(c);
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if (type == 'i')
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base = 0;
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*basep = base;
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*bufp = '\0';
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return bufp - 1;
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}
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#if ACKCONF_WANT_STDIO_FLOAT
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/* The function f_collect() reads a string that has the format of a
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* floating-point number. The function returns as soon as a format-error
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* is encountered, leaving the offending character in the input. This means
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* that 1.el leaves the 'l' in the input queue. Since all detection of
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* format errors is done here, _doscan() doesn't call strtod() when it's
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* not necessary, although the use of the width field can cause incomplete
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* numbers to be passed to strtod(). (e.g. 1.3e+)
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*/
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static char* f_collect(register int c, register int width)
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{
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register char* bufp = inp_buf;
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int digit_seen = 0;
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if (c == '-' || c == '+')
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{
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*bufp++ = c;
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if (--width)
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c = _doscan_get();
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}
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while (width && isdigit(c))
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{
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digit_seen++;
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*bufp++ = c;
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if (--width)
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c = _doscan_get();
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}
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if (width && c == '.')
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{
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*bufp++ = c;
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if (--width)
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c = _doscan_get();
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while (width && isdigit(c))
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{
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digit_seen++;
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*bufp++ = c;
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if (--width)
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c = _doscan_get();
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}
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}
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if (!digit_seen)
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{
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if (width && c != EOF)
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_doscan_unget(c);
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return inp_buf - 1;
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}
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else
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digit_seen = 0;
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if (width && (c == 'e' || c == 'E'))
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{
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*bufp++ = c;
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if (--width)
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c = _doscan_get();
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if (width && (c == '+' || c == '-'))
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{
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*bufp++ = c;
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if (--width)
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c = _doscan_get();
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}
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while (width && isdigit(c))
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{
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digit_seen++;
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*bufp++ = c;
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if (--width)
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c = _doscan_get();
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}
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if (!digit_seen)
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{
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if (width && c != EOF)
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_doscan_unget(c);
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return inp_buf - 1;
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}
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}
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if (width && c != EOF)
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_doscan_unget(c);
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*bufp = '\0';
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return bufp - 1;
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}
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#endif
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/*
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* the routine that does the scanning
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*/
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int _doscan(const char* format, va_list ap)
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{
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int done = 0; /* number of items done */
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int nrchars = 0; /* number of characters read */
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int conv = 0; /* # of conversions */
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int base; /* conversion base */
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unsigned long val; /* an integer value */
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register char* str; /* temporary pointer */
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char* tmp_string; /* ditto */
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unsigned width; /* width of field */
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int flags; /* some flags */
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int reverse; /* reverse the checking in [...] */
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int kind;
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register int ic; /* the input character */
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#if ACKCONF_WANT_STDIO_FLOAT
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long double ld_val;
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#endif
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if (!*format)
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return 0;
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while (1)
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{
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if (isspace(*format))
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{
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while (isspace(*format))
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format++; /* skip whitespace */
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ic = _doscan_get();
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nrchars++;
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while (isspace(ic))
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{
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ic = _doscan_get();
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nrchars++;
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}
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if (ic != EOF)
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_doscan_unget(ic);
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nrchars--;
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}
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if (!*format)
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break; /* end of format */
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if (*format != '%')
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{
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ic = _doscan_get();
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nrchars++;
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if (ic != *format++)
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{
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if (ic != EOF)
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_doscan_unget(ic);
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nrchars--;
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break; /* error */
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}
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continue;
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}
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format++;
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if (*format == '%')
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{
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ic = _doscan_get();
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nrchars++;
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if (ic == '%')
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{
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format++;
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continue;
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}
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else
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break;
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}
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flags = 0;
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if (*format == '*')
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{
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format++;
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flags |= FL_NOASSIGN;
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}
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if (isdigit(*format))
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{
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flags |= FL_WIDTHSPEC;
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for (width = 0; isdigit(*format);)
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width = width * 10 + *format++ - '0';
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}
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switch (*format)
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{
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case 'h':
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flags |= FL_SHORT;
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format++;
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break;
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case 'l':
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flags |= FL_LONG;
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format++;
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break;
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case 'L':
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flags |= FL_LONGDOUBLE;
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format++;
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break;
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}
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kind = *format;
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if ((kind != 'c') && (kind != '[') && (kind != 'n'))
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{
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do
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{
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ic = _doscan_get();
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nrchars++;
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} while (isspace(ic));
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if (ic == EOF)
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break; /* outer while */
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}
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else if (kind != 'n')
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{ /* %c or %[ */
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ic = _doscan_get();
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if (ic == EOF)
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break; /* outer while */
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nrchars++;
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}
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switch (kind)
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{
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default:
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/* not recognized, like %q */
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return conv || (ic != EOF) ? done : EOF;
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break;
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case 'n':
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if (!(flags & FL_NOASSIGN))
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{ /* silly, though */
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if (flags & FL_SHORT)
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*va_arg(ap, short*) = (short)nrchars;
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else if (flags & FL_LONG)
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*va_arg(ap, long*) = (long)nrchars;
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else
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*va_arg(ap, int*) = (int)nrchars;
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}
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break;
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case 'p': /* pointer */
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set_pointer(flags);
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/* fallthrough */
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case 'b': /* binary */
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case 'd': /* decimal */
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case 'i': /* general integer */
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case 'o': /* octal */
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case 'u': /* unsigned */
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case 'x': /* hexadecimal */
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case 'X': /* ditto */
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if (!(flags & FL_WIDTHSPEC) || width > NUMLEN)
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width = NUMLEN;
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if (!width)
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return done;
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str = o_collect(ic, kind, width, &base);
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if (str < inp_buf
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|| (str == inp_buf
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&& (*str == '-'
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|| *str == '+')))
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return done;
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/*
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* Although the length of the number is str-inp_buf+1
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* we don't add the 1 since we counted it already
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*/
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nrchars += str - inp_buf;
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if (!(flags & FL_NOASSIGN))
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{
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if (kind == 'd' || kind == 'i')
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val = strtol(inp_buf, &tmp_string, base);
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else
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val = strtoul(inp_buf, &tmp_string, base);
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if (flags & FL_LONG)
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*va_arg(ap, unsigned long*) = (unsigned long)val;
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else if (flags & FL_SHORT)
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*va_arg(ap, unsigned short*) = (unsigned short)val;
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else
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*va_arg(ap, unsigned*) = (unsigned)val;
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}
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break;
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case 'c':
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if (!(flags & FL_WIDTHSPEC))
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width = 1;
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if (!(flags & FL_NOASSIGN))
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str = va_arg(ap, char*);
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if (!width)
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return done;
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while (width && ic != EOF)
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{
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if (!(flags & FL_NOASSIGN))
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*str++ = (char)ic;
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if (--width)
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{
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ic = _doscan_get();
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nrchars++;
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}
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}
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if (width)
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{
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if (ic != EOF)
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_doscan_unget(ic);
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nrchars--;
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}
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break;
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case 's':
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if (!(flags & FL_WIDTHSPEC))
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width = 0xffff;
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if (!(flags & FL_NOASSIGN))
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str = va_arg(ap, char*);
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if (!width)
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return done;
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while (width && ic != EOF && !isspace(ic))
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{
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if (!(flags & FL_NOASSIGN))
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*str++ = (char)ic;
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if (--width)
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{
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ic = _doscan_get();
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nrchars++;
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}
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}
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/* terminate the string */
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if (!(flags & FL_NOASSIGN))
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*str = '\0';
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if (width)
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{
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if (ic != EOF)
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_doscan_unget(ic);
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nrchars--;
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}
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break;
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case '[':
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if (!(flags & FL_WIDTHSPEC))
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width = 0xffff;
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if (!width)
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return done;
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if (*++format == '^')
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{
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reverse = 1;
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format++;
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}
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else
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reverse = 0;
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for (str = Xtable; str < &Xtable[NR_CHARS]; str++)
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*str = 0;
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if (*format == ']')
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Xtable[*format++] = 1;
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while (*format && *format != ']')
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{
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Xtable[*format++] = 1;
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if (*format == '-')
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{
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format++;
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if (*format
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&& *format != ']'
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&& *(format) >= *(format - 2))
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{
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int c;
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for (c = *(format - 2) + 1; c <= *format; c++)
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Xtable[c] = 1;
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format++;
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}
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else
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Xtable['-'] = 1;
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}
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}
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if (!*format || !(Xtable[ic] ^ reverse))
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{
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if (ic != EOF)
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_doscan_unget(ic);
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return done;
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}
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if (!(flags & FL_NOASSIGN))
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str = va_arg(ap, char*);
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do
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{
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if (!(flags & FL_NOASSIGN))
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*str++ = (char)ic;
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if (--width)
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{
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ic = _doscan_get();
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nrchars++;
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}
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} while (width && ic != EOF && (Xtable[ic] ^ reverse));
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if (width)
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{
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if (ic != EOF)
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_doscan_unget(ic);
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nrchars--;
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}
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if (!(flags & FL_NOASSIGN))
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{ /* terminate string */
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*str = '\0';
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}
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break;
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#if ACKCONF_WANT_STDIO_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':
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if (!(flags & FL_WIDTHSPEC) || width > NUMLEN)
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width = NUMLEN;
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if (!width)
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return done;
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str = f_collect(ic, width);
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if (str < inp_buf
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|| (str == inp_buf
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&& (*str == '-'
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|| *str == '+')))
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return done;
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/*
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* Although the length of the number is str-inp_buf+1
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* we don't add the 1 since we counted it already
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*/
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nrchars += str - inp_buf;
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if (!(flags & FL_NOASSIGN))
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{
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ld_val = strtod(inp_buf, &tmp_string);
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if (flags & FL_LONGDOUBLE)
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*va_arg(ap, long double*) = (long double)ld_val;
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else if (flags & FL_LONG)
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*va_arg(ap, double*) = (double)ld_val;
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else
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*va_arg(ap, float*) = (float)ld_val;
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}
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break;
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#endif
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} /* end switch */
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conv++;
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if (!(flags & FL_NOASSIGN) && kind != 'n')
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done++;
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format++;
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}
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return conv || (ic != EOF) ? done : EOF;
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}
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#endif
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