comparison src/fftw-3.3.5/kernel/scan.c @ 127:7867fa7e1b6b

Current fftw source

+/*
+ * Copyright (c) 2003, 2007-14 Matteo Frigo
+ * Copyright (c) 2003, 2007-14 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+
+#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, int maxlen)
+{
+     char *s0 = s;
+     int ch;
+
+     A(maxlen > 0);
+     while ((ch = GETCHR(sc)) != EOF && !isspace(ch)
+	    && ch != ')' && ch != '(' && s < s0 + maxlen)
+	  *s++ = (char)(ch & 0xFF);
+     *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;
+     int 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 = (md5uint)
+				    (0xFFFFFFFF & 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);
+}