409 lines
8.7 KiB
C
409 lines
8.7 KiB
C
/*
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* doscan.c - scan formatted input
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*/
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/* $Header$ */
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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 "loc_incl.h"
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#define NUMLEN 512
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static char Xtable[128];
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static char inp_buf[NUMLEN];
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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 *
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o_collect(register int c, register FILE *stream, char type,
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int width, int *base)
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{
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register char *bufp = inp_buf;
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switch (type) {
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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': *base = 16; break;
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case 'd':
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case 'u': *base = 10; break;
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case 'o': *base = 8; break;
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case 'b': *base = 2; break;
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}
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if (c == '-' || c == '+') {
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*bufp++ = c;
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width--;
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c = getc(stream);
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}
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if (width && c == '0' && *base == 16) {
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*bufp++ = c;
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width--;
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c = getc(stream);
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if (c != 'x' && c != 'X') {
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if (type == 'i') *base = 8;
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}
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else if (width) {
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*bufp++ = c;
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width--;
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c = getc(stream);
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}
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}
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else if (type == 'i') *base = 10;
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while (width) {
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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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*bufp++ = c;
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width--;
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c = getc(stream);
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}
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else break;
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}
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if (c != EOF) ungetc(c, stream);
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if (type == 'i') *base = 0;
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*bufp-- = '\0';
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return bufp;
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}
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#ifndef NOFLOAT
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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.
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*/
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static char *
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f_collect(register int c, register FILE *stream, 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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*bufp++ = c;
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width--;
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c = getc(stream);
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}
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while (width && isdigit(c)) {
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digit_seen++;
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*bufp++ = c;
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width--;
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c = getc(stream);
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}
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if (width && c == '.') {
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*bufp++ = c;
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width--;
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c = getc(stream);
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while (width && isdigit(c)) {
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digit_seen++;
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*bufp++ = c;
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width--;
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c = getc(stream);
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}
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}
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if (!digit_seen) {
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if (c != EOF) ungetc(c, stream);
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return inp_buf - 1;
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}
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else digit_seen = 0;
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if (width && (c == 'e' || c == 'E')) {
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*bufp++ = c;
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width--;
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c = getc(stream);
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if (width && (c == '+' || c == '-')) {
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*bufp++ = c;
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width--;
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c = getc(stream);
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}
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while (width && isdigit(c)) {
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digit_seen++;
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*bufp++ = c;
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width--;
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c = getc(stream);
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}
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if (!digit_seen) {
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if (c != EOF) ungetc(c,stream);
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return inp_buf - 1;
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}
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}
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if (c != EOF) ungetc(c, stream);
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*bufp-- = '\0';
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return bufp;
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}
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#endif /* NOFLOAT */
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/*
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* the routine that does the scanning
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*/
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int
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_doscan(register FILE *stream, 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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char *str, *tmp_string; /* temporary pointers */
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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;
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#ifndef NOFLOAT
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long double ld_val;
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#endif
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ic = getc(stream);
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if (ic == EOF)
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return EOF;
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ungetc(ic,stream);
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while (1) {
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if (isspace(*format)) {
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while (isspace (*format))
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++format; /* skip whitespace */
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ic = getc(stream);
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nrchars++;
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while (isspace (ic)) {
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ic = getc(stream);
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nrchars++;
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}
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}
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else {
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ic = getc(stream);
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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 (ic == EOF)
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return conv ? done : EOF;
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if (*format != '%') {
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if (ic != *format)
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break; /* matching error */
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++format;
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continue;
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}
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++format;
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if (*format == '%') {
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if (ic == '%') {
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format++;
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continue;
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}
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else break;
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}
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flags = 0;
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if (*format == '*') {
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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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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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case 'h': flags |= FL_SHORT; format++; break;
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case 'l': flags |= FL_LONG; format++; break;
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case 'L': flags |= FL_LONGDOUBLE; format++; 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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while (ic != EOF && isspace(ic)) {
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ic = getc(stream);
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nrchars++;
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}
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if (ic == EOF) return conv ? done : EOF;
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}
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conv++;
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switch (kind) {
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default:
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if (kind == ic) continue;
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break;
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case 'n':
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if (ic != EOF)
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ungetc(ic, stream);
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nrchars--;
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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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break;
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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 'p': /* pointer */
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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))
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width = NUMLEN;
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if (!width) return done;
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str = o_collect(ic, stream, kind, width, &base);
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if (str < inp_buf) return done;
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nrchars += str - inp_buf + 1;
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if (!(flags & FL_NOASSIGN)) {
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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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done++;
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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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tmp_string = va_arg(ap, char *);
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if (!width) return done;
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if (width && !(flags & FL_NOASSIGN) && (ic != EOF))
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++done;
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while (width && ic != EOF) {
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if (!(flags & FL_NOASSIGN))
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*tmp_string++ = (char) ic;
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width--;
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ic = getc(stream);
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nrchars++;
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}
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if (ic != EOF)
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ungetc(ic,stream);
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nrchars--;
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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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tmp_string = va_arg(ap, char *);
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if (!width) return done;
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if (!(flags & FL_NOASSIGN))
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++done;
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while (width && ic != EOF && !isspace(ic)) {
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if (!(flags & FL_NOASSIGN))
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*tmp_string++ = (char) ic;
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width--;
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ic = getc(stream);
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nrchars++;
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/* terminate the string */
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if (!(flags & FL_NOASSIGN))
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*tmp_string = '\0';
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}
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if (ic != EOF)
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ungetc(ic,stream);
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nrchars--;
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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) return done;
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if ( *(++format) == '^' ) {
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reverse = 1;
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format++;
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} else
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reverse = 0;
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for (tmp_string = Xtable; tmp_string < &Xtable[128]
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; tmp_string++)
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*tmp_string = 0;
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if (*format == ']') Xtable[*format++] = 1;
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while (*format && *format != ']') {
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Xtable[*format++] = 1;
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if (*format == '-') {
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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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int c;
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for( c = *(format -2) + 1
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; c <= *format ; c++)
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Xtable[c] = 1;
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format++;
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}
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else Xtable['-'] = 1;
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}
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}
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if (!*format)
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return done;
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if (!(flags & FL_NOASSIGN))
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tmp_string = va_arg(ap, char *);
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while (width && ic != EOF && (Xtable[ic] ^ reverse)) {
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if (!(flags & FL_NOASSIGN))
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*tmp_string++ = (char) ic;
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width--;
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ic = getc(stream);
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nrchars++;
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}
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if (ic != EOF)
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ungetc(ic, stream);
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nrchars--;
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if (!(flags & FL_NOASSIGN)) { /* terminate string */
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*tmp_string = '\0';
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++done;
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}
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break;
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#ifndef NOFLOAT:
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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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if (width > NUMLEN) width = NUMLEN;
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if (!width) return done;
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str = f_collect(ic, stream, width);
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if (str < inp_buf) return done;
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nrchars += str - inp_buf + 1;
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if (!(flags & FL_NOASSIGN)) {
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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
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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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done++;
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}
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break;
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#endif
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} /* end switch */
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++format;
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}
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if (ic != EOF)
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ungetc(ic, stream);
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return conv ? done : EOF;
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}
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