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Diffstat (limited to 'usr/dash/parser.h')
| -rw-r--r-- | usr/dash/parser.h | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/usr/dash/parser.h b/usr/dash/parser.h new file mode 100644 index 0000000..e6caed6 --- /dev/null +++ b/usr/dash/parser.h @@ -0,0 +1,93 @@ +/*- + * Copyright (c) 1991, 1993 + * The Regents of the University of California. All rights reserved. + * Copyright (c) 1997-2005 + * Herbert Xu <herbert@gondor.apana.org.au>. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Kenneth Almquist. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)parser.h 8.3 (Berkeley) 5/4/95 + */ + +/* control characters in argument strings */ +#define CTL_FIRST -127 /* first 'special' character */ +#define CTLESC -127 /* escape next character */ +#define CTLVAR -126 /* variable defn */ +#define CTLENDVAR -125 +#define CTLBACKQ -124 +#define CTLARI -122 /* arithmetic expression */ +#define CTLENDARI -121 +#define CTLQUOTEMARK -120 +#define CTL_LAST -120 /* last 'special' character */ + +/* variable substitution byte (follows CTLVAR) */ +#define VSTYPE 0x0f /* type of variable substitution */ +#define VSNUL 0x10 /* colon--treat the empty string as unset */ + +/* values of VSTYPE field */ +#define VSNORMAL 0x1 /* normal variable: $var or ${var} */ +#define VSMINUS 0x2 /* ${var-text} */ +#define VSPLUS 0x3 /* ${var+text} */ +#define VSQUESTION 0x4 /* ${var?message} */ +#define VSASSIGN 0x5 /* ${var=text} */ +#define VSTRIMRIGHT 0x6 /* ${var%pattern} */ +#define VSTRIMRIGHTMAX 0x7 /* ${var%%pattern} */ +#define VSTRIMLEFT 0x8 /* ${var#pattern} */ +#define VSTRIMLEFTMAX 0x9 /* ${var##pattern} */ +#define VSLENGTH 0xa /* ${#var} */ + +/* values of checkkwd variable */ +#define CHKALIAS 0x1 +#define CHKKWD 0x2 +#define CHKNL 0x4 +#define CHKEOFMARK 0x8 + + +/* + * NEOF is returned by parsecmd when it encounters an end of file. It + * must be distinct from NULL, so we use the address of a variable that + * happens to be handy. + */ +extern int tokpushback; +#define NEOF ((union node *)&tokpushback) +extern int whichprompt; /* 1 == PS1, 2 == PS2 */ +extern int checkkwd; + + +union node *parsecmd(int); +void fixredir(union node *, const char *, int); +const char *getprompt(void *); +const char *const *findkwd(const char *); +char *endofname(const char *); +const char *expandstr(const char *); + +static inline int +goodname(const char *p) +{ + return !*endofname(p); +} |