cannam@95: /* cannam@95: * Copyright (c) 2003, 2007-11 Matteo Frigo cannam@95: * Copyright (c) 2003, 2007-11 Massachusetts Institute of Technology cannam@95: * cannam@95: * This program is free software; you can redistribute it and/or modify cannam@95: * it under the terms of the GNU General Public License as published by cannam@95: * the Free Software Foundation; either version 2 of the License, or cannam@95: * (at your option) any later version. cannam@95: * cannam@95: * This program is distributed in the hope that it will be useful, cannam@95: * but WITHOUT ANY WARRANTY; without even the implied warranty of cannam@95: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the cannam@95: * GNU General Public License for more details. cannam@95: * cannam@95: * You should have received a copy of the GNU General Public License cannam@95: * along with this program; if not, write to the Free Software cannam@95: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA cannam@95: * cannam@95: */ cannam@95: cannam@95: cannam@95: #include "ifftw.h" cannam@95: #include cannam@95: #include cannam@95: #include cannam@95: #include cannam@95: cannam@95: #ifdef USE_CTYPE cannam@95: #include cannam@95: #else cannam@95: /* Screw ctype. On linux, the is* functions call a routine that gets cannam@95: the ctype map in the current locale. Because this operation is cannam@95: expensive, the map is cached on a per-thread basis. I am not cannam@95: willing to link this crap with FFTW. Not over my dead body. cannam@95: cannam@95: Sic transit gloria mundi. cannam@95: */ cannam@95: #undef isspace cannam@95: #define isspace(x) ((x) >= 0 && (x) <= ' ') cannam@95: #undef isdigit cannam@95: #define isdigit(x) ((x) >= '0' && (x) <= '9') cannam@95: #undef isupper cannam@95: #define isupper(x) ((x) >= 'A' && (x) <= 'Z') cannam@95: #undef islower cannam@95: #define islower(x) ((x) >= 'a' && (x) <= 'z') cannam@95: #endif cannam@95: cannam@95: static int mygetc(scanner *sc) cannam@95: { cannam@95: if (sc->ungotc != EOF) { cannam@95: int c = sc->ungotc; cannam@95: sc->ungotc = EOF; cannam@95: return c; cannam@95: } cannam@95: return(sc->getchr(sc)); cannam@95: } cannam@95: cannam@95: #define GETCHR(sc) mygetc(sc) cannam@95: cannam@95: static void myungetc(scanner *sc, int c) cannam@95: { cannam@95: sc->ungotc = c; cannam@95: } cannam@95: cannam@95: #define UNGETCHR(sc, c) myungetc(sc, c) cannam@95: cannam@95: static void eat_blanks(scanner *sc) cannam@95: { cannam@95: int ch; cannam@95: while (ch = GETCHR(sc), isspace(ch)) cannam@95: ; cannam@95: UNGETCHR(sc, ch); cannam@95: } cannam@95: cannam@95: static void mygets(scanner *sc, char *s, size_t maxlen) cannam@95: { cannam@95: char *s0 = s; cannam@95: int ch; cannam@95: cannam@95: A(maxlen > 0); cannam@95: while ((ch = GETCHR(sc)) != EOF && !isspace(ch) cannam@95: && ch != ')' && ch != '(' && s < s0 + maxlen) cannam@95: *s++ = ch; cannam@95: *s = 0; cannam@95: UNGETCHR(sc, ch); cannam@95: } cannam@95: cannam@95: static long getlong(scanner *sc, int base, int *ret) cannam@95: { cannam@95: int sign = 1, ch, count; cannam@95: long x = 0; cannam@95: cannam@95: ch = GETCHR(sc); cannam@95: if (ch == '-' || ch == '+') { cannam@95: sign = ch == '-' ? -1 : 1; cannam@95: ch = GETCHR(sc); cannam@95: } cannam@95: for (count = 0; ; ++count) { cannam@95: if (isdigit(ch)) cannam@95: ch -= '0'; cannam@95: else if (isupper(ch)) cannam@95: ch -= 'A' - 10; cannam@95: else if (islower(ch)) cannam@95: ch -= 'a' - 10; cannam@95: else cannam@95: break; cannam@95: x = x * base + ch; cannam@95: ch = GETCHR(sc); cannam@95: } cannam@95: x *= sign; cannam@95: UNGETCHR(sc, ch); cannam@95: *ret = count > 0; cannam@95: return x; cannam@95: } cannam@95: cannam@95: /* vscan is mostly scanf-like, with our additional format specifiers, cannam@95: but with a few twists. It returns simply 0 or 1 indicating whether cannam@95: the match was successful. '(' and ')' in the format string match cannam@95: those characters preceded by any whitespace. Finally, if a cannam@95: character match fails, it will ungetchr() the last character back cannam@95: onto the stream. */ cannam@95: static int vscan(scanner *sc, const char *format, va_list ap) cannam@95: { cannam@95: const char *s = format; cannam@95: char c; cannam@95: int ch = 0; cannam@95: size_t fmt_len; cannam@95: cannam@95: while ((c = *s++)) { cannam@95: fmt_len = 0; cannam@95: switch (c) { cannam@95: case '%': cannam@95: getformat: cannam@95: switch ((c = *s++)) { cannam@95: case 's': { cannam@95: char *x = va_arg(ap, char *); cannam@95: mygets(sc, x, fmt_len); cannam@95: break; cannam@95: } cannam@95: case 'd': { cannam@95: int *x = va_arg(ap, int *); cannam@95: *x = (int) getlong(sc, 10, &ch); cannam@95: if (!ch) return 0; cannam@95: break; cannam@95: } cannam@95: case 'x': { cannam@95: int *x = va_arg(ap, int *); cannam@95: *x = (int) getlong(sc, 16, &ch); cannam@95: if (!ch) return 0; cannam@95: break; cannam@95: } cannam@95: case 'M': { cannam@95: md5uint *x = va_arg(ap, md5uint *); cannam@95: *x = (md5uint) cannam@95: (0xffffffffUL & getlong(sc, 16, &ch)); cannam@95: if (!ch) return 0; cannam@95: break; cannam@95: } cannam@95: case '*': { cannam@95: if ((fmt_len = va_arg(ap, int)) <= 0) return 0; cannam@95: goto getformat; cannam@95: } cannam@95: default: cannam@95: A(0 /* unknown format */); cannam@95: break; cannam@95: } cannam@95: break; cannam@95: default: cannam@95: if (isspace(c) || c == '(' || c == ')') cannam@95: eat_blanks(sc); cannam@95: if (!isspace(c) && (ch = GETCHR(sc)) != c) { cannam@95: UNGETCHR(sc, ch); cannam@95: return 0; cannam@95: } cannam@95: break; cannam@95: } cannam@95: } cannam@95: return 1; cannam@95: } cannam@95: cannam@95: static int scan(scanner *sc, const char *format, ...) cannam@95: { cannam@95: int ret; cannam@95: va_list ap; cannam@95: va_start(ap, format); cannam@95: ret = vscan(sc, format, ap); cannam@95: va_end(ap); cannam@95: return ret; cannam@95: } cannam@95: cannam@95: scanner *X(mkscanner)(size_t size, int (*getchr)(scanner *sc)) cannam@95: { cannam@95: scanner *s = (scanner *)MALLOC(size, OTHER); cannam@95: s->scan = scan; cannam@95: s->vscan = vscan; cannam@95: s->getchr = getchr; cannam@95: s->ungotc = EOF; cannam@95: return s; cannam@95: } cannam@95: cannam@95: void X(scanner_destroy)(scanner *sc) cannam@95: { cannam@95: X(ifree)(sc); cannam@95: }