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/*
* Copyright (c) 2003 Matteo Frigo
* Copyright (c) 2003 Massachusetts Institute of Technology
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/* $Id: scan.c,v 1.1 2008/10/17 06:11:29 scuri Exp $ */
#include "ifftw.h"
#include <string.h>
#include <stddef.h>
#include <stdarg.h>
#include <stdio.h>
#ifdef USE_CTYPE
#include <ctype.h>
#else
/* Screw ctype. On linux, the is* functions call a routine that gets
the ctype map in the current locale. Because this operation is
expensive, the map is cached on a per-thread basis. I am not
willing to link this crap with FFTW. Not over my dead body.
Sic transit gloria mundi.
*/
#undef isspace
#define isspace(x) ((x) >= 0 && (x) <= ' ')
#undef isdigit
#define isdigit(x) ((x) >= '0' && (x) <= '9')
#undef isupper
#define isupper(x) ((x) >= 'A' && (x) <= 'Z')
#undef islower
#define islower(x) ((x) >= 'a' && (x) <= 'z')
#endif
static int mygetc(scanner *sc)
{
if (sc->ungotc != EOF) {
int c = sc->ungotc;
sc->ungotc = EOF;
return c;
}
return(sc->getchr(sc));
}
#define GETCHR(sc) mygetc(sc)
static void myungetc(scanner *sc, int c)
{
sc->ungotc = c;
}
#define UNGETCHR(sc, c) myungetc(sc, c)
static void eat_blanks(scanner *sc)
{
int ch;
while (ch = GETCHR(sc), isspace(ch))
;
UNGETCHR(sc, ch);
}
static void mygets(scanner *sc, char *s, size_t maxlen)
{
char *s0 = s;
int ch;
A(maxlen > 0);
while ((ch = GETCHR(sc)) != EOF && !isspace(ch)
&& ch != ')' && ch != '(' && s < s0 + maxlen)
*s++ = ch;
*s = 0;
UNGETCHR(sc, ch);
}
static long getlong(scanner *sc, int base, int *ret)
{
int sign = 1, ch, count;
long x = 0;
ch = GETCHR(sc);
if (ch == '-' || ch == '+') {
sign = ch == '-' ? -1 : 1;
ch = GETCHR(sc);
}
for (count = 0; ; ++count) {
if (isdigit(ch))
ch -= '0';
else if (isupper(ch))
ch -= 'A' - 10;
else if (islower(ch))
ch -= 'a' - 10;
else
break;
x = x * base + ch;
ch = GETCHR(sc);
}
x *= sign;
UNGETCHR(sc, ch);
*ret = count > 0;
return x;
}
/* vscan is mostly scanf-like, with our additional format specifiers,
but with a few twists. It returns simply 0 or 1 indicating whether
the match was successful. '(' and ')' in the format string match
those characters preceded by any whitespace. Finally, if a
character match fails, it will ungetchr() the last character back
onto the stream. */
static int vscan(scanner *sc, const char *format, va_list ap)
{
const char *s = format;
char c;
int ch = 0;
size_t fmt_len;
while ((c = *s++)) {
fmt_len = 0;
switch (c) {
case '%':
getformat:
switch ((c = *s++)) {
case 's': {
char *x = va_arg(ap, char *);
mygets(sc, x, fmt_len);
break;
}
case 'd': {
int *x = va_arg(ap, int *);
*x = (int) getlong(sc, 10, &ch);
if (!ch) return 0;
break;
}
case 'x': {
int *x = va_arg(ap, int *);
*x = (int) getlong(sc, 16, &ch);
if (!ch) return 0;
break;
}
case 'M': {
md5uint *x = va_arg(ap, md5uint *);
*x = 0xffffffffUL & getlong(sc, 16, &ch);
if (!ch) return 0;
break;
}
case '*': {
if ((fmt_len = va_arg(ap, int)) <= 0) return 0;
goto getformat;
}
default:
A(0 /* unknown format */);
break;
}
break;
default:
if (isspace(c) || c == '(' || c == ')')
eat_blanks(sc);
if (!isspace(c) && (ch = GETCHR(sc)) != c) {
UNGETCHR(sc, ch);
return 0;
}
break;
}
}
return 1;
}
static int scan(scanner *sc, const char *format, ...)
{
int ret;
va_list ap;
va_start(ap, format);
ret = vscan(sc, format, ap);
va_end(ap);
return ret;
}
scanner *X(mkscanner)(size_t size, int (*getchr)(scanner *sc))
{
scanner *s = (scanner *)MALLOC(size, OTHER);
s->scan = scan;
s->vscan = vscan;
s->getchr = getchr;
s->ungotc = EOF;
return s;
}
void X(scanner_destroy)(scanner *sc)
{
X(ifree)(sc);
}
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