534 lines
16 KiB
C
534 lines
16 KiB
C
/* $NetBSD: sh.h,v 1.35 2017/06/30 04:44:46 kamil Exp $ */
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/*
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* Public Domain Bourne/Korn shell
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*/
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/* $Id: sh.h,v 1.35 2017/06/30 04:44:46 kamil Exp $ */
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#include "config.h" /* system and option configuration info */
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#define ARGS(args) args /* prototype declaration */
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/* Start of common headers */
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#include <stdio.h>
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#include <sys/types.h>
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#include <setjmp.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdarg.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdint.h>
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#ifndef O_ACCMODE
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# define O_ACCMODE (O_RDONLY|O_WRONLY|O_RDWR)
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#endif /* !O_ACCMODE */
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#ifndef F_OK /* access() arguments */
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# define F_OK 0
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# define X_OK 1
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# define W_OK 2
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# define R_OK 4
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#endif /* !F_OK */
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#ifndef SEEK_SET
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# ifdef L_SET
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# define SEEK_SET L_SET
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# define SEEK_CUR L_INCR
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# define SEEK_END L_XTND
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# else /* L_SET */
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# define SEEK_SET 0
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# define SEEK_CUR 1
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# define SEEK_END 2
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# endif /* L_SET */
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#endif /* !SEEK_SET */
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#include <limits.h>
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#include <signal.h>
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#ifdef NSIG
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# define SIGNALS NSIG
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#else
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# ifdef _MINIX
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# define SIGNALS (_NSIG+1) /* _NSIG is # of signals used, excluding 0. */
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# else
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# ifdef _SIGMAX /* QNX */
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# define SIGNALS _SIGMAX
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# else /* _SIGMAX */
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# define SIGNALS 32
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# endif /* _SIGMAX */
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# endif /* _MINIX */
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#endif /* NSIG */
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#ifndef SIGCHLD
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# define SIGCHLD SIGCLD
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#endif
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/* struct sigaction.sa_flags is set to KSH_SA_FLAGS. Used to ensure
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* system calls are interrupted
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*/
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#ifdef SA_INTERRUPT
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# define KSH_SA_FLAGS SA_INTERRUPT
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#else /* SA_INTERRUPT */
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# define KSH_SA_FLAGS 0
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#endif /* SA_INTERRUPT */
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typedef RETSIGTYPE (*handler_t) ARGS((int)); /* signal handler */
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#ifdef HAVE_PATHS_H
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# include <paths.h>
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#endif /* HAVE_PATHS_H */
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#ifdef _PATH_DEFPATH
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# define DEFAULT__PATH _PATH_DEFPATH
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#else /* _PATH_DEFPATH */
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# define DEFAULT__PATH DEFAULT_PATH
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#endif /* _PATH_DEFPATH */
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#ifndef HAVE_KILLPG
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# define killpg(p, s) kill(-(p), (s))
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#endif /* !HAVE_KILLPG */
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/* this is a hang-over from older versions of the os2 port */
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#define ksh_dupbase(fd, base) fcntl(fd, F_DUPFD, base)
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#ifdef HAVE_SIGSETJMP
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# define ksh_sigsetjmp(env,sm) sigsetjmp((env), (sm))
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# define ksh_siglongjmp(env,v) siglongjmp((env), (v))
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# define ksh_jmp_buf sigjmp_buf
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#else /* HAVE_SIGSETJMP */
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# ifdef HAVE__SETJMP
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# define ksh_sigsetjmp(env,sm) _setjmp(env)
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# define ksh_siglongjmp(env,v) _longjmp((env), (v))
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# else /* HAVE__SETJMP */
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# define ksh_sigsetjmp(env,sm) setjmp(env)
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# define ksh_siglongjmp(env,v) longjmp((env), (v))
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# endif /* HAVE__SETJMP */
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# define ksh_jmp_buf jmp_buf
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#endif /* HAVE_SIGSETJMP */
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/* end of common headers */
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/* Stop gcc and lint from complaining about possibly uninitialized variables */
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#if defined(__GNUC__) || defined(lint)
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# define UNINITIALIZED(var) var = 0
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#else
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# define UNINITIALIZED(var) var
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#endif /* GNUC || lint */
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/* some useful #defines */
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#ifdef EXTERN
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# define I__(i) = i
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#else
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# define I__(i)
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# define EXTERN extern
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# define EXTERN_DEFINED
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#endif
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#ifndef EXECSHELL
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/* shell to exec scripts (see also $SHELL initialization in main.c) */
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# define EXECSHELL "/bin/sh"
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# define EXECSHELL_STR "EXECSHELL"
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#endif
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/* ISABSPATH() means path is fully and completely specified,
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* ISROOTEDPATH() means a .. as the first component is a no-op,
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* ISRELPATH() means $PWD can be tacked on to get an absolute path.
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*
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* OS Path ISABSPATH ISROOTEDPATH ISRELPATH
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* unix /foo yes yes no
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* unix foo no no yes
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* unix ../foo no no yes
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*/
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# define PATHSEP ':'
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# define DIRSEP '/'
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# define DIRSEPSTR "/"
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# define ISDIRSEP(c) ((c) == '/')
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# define ISABSPATH(s) ISDIRSEP((s)[0])
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# define ISRELPATH(s) (!ISABSPATH(s))
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# define ISROOTEDPATH(s) ISABSPATH(s)
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# define FILECHCONV(c) c
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# define FILECMP(s1, s2) strcmp(s1, s2)
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# define FILENCMP(s1, s2, n) strncmp(s1, s2, n)
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# define ksh_strchr_dirsep(p) strchr(p, DIRSEP)
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# define ksh_strrchr_dirsep(p) strrchr(p, DIRSEP)
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#define NELEM(a) (sizeof(a) / sizeof((a)[0]))
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#define sizeofN(type, n) (sizeof(type) * (n))
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#define BIT(i) (1<<(i)) /* define bit in flag */
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/* Table flag type - needs > 16 and < 32 bits */
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typedef int_least32_t Tflag;
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#define NUFILE 32 /* Number of user-accessible files */
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#define FDBASE 10 /* First file usable by Shell */
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/* you're not going to run setuid shell scripts, are you? */
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#define eaccess(path, mode) access(path, mode)
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/* Make MAGIC a char that might be printed to make bugs more obvious, but
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* not a char that is used often. Also, can't use the high bit as it causes
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* portability problems (calling strchr(x, 0x80|'x') is error prone).
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*/
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#define MAGIC (7) /* prefix for *?[!{,} during expand */
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#define ISMAGIC(c) ((unsigned char)(c) == MAGIC)
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#define NOT '!' /* might use ^ (ie, [!...] vs [^..]) */
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#define LINE 1024 /* input line size */
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#define PATH 1024 /* pathname size (todo: PATH_MAX/pathconf()) */
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#define ARRAYMAX 1023 /* max array index */
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EXTERN const char *kshname; /* $0 */
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EXTERN pid_t kshpid; /* $$, shell pid */
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EXTERN pid_t procpid; /* pid of executing process */
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EXTERN uid_t ksheuid; /* effective uid of shell */
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EXTERN int exstat; /* exit status */
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EXTERN int subst_exstat; /* exit status of last $(..)/`..` */
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EXTERN const char *safe_prompt; /* safe prompt if PS1 substitution fails */
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/*
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* Area-based allocation built on malloc/free
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*/
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typedef struct Area {
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struct link *freelist; /* free list */
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} Area;
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EXTERN Area aperm; /* permanent object space */
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#define APERM &aperm
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#define ATEMP &e->area
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#ifdef KSH_DEBUG
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# define kshdebug_init() kshdebug_init_()
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# define kshdebug_printf(a) kshdebug_printf_ a
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# define kshdebug_dump(a) kshdebug_dump_ a
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#else /* KSH_DEBUG */
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# define kshdebug_init()
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# define kshdebug_printf(a)
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# define kshdebug_dump(a)
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#endif /* KSH_DEBUG */
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/*
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* parsing & execution environment
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*/
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EXTERN struct env {
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short type; /* environment type - see below */
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short flags; /* EF_* */
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Area area; /* temporary allocation area */
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struct block *loc; /* local variables and functions */
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short *savefd; /* original redirected fd's */
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struct env *oenv; /* link to previous environment */
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ksh_jmp_buf jbuf; /* long jump back to env creator */
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struct temp *temps; /* temp files */
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} *e;
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/* struct env.type values */
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#define E_NONE 0 /* dummy environment */
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#define E_PARSE 1 /* parsing command # */
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#define E_FUNC 2 /* executing function # */
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#define E_INCL 3 /* including a file via . # */
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#define E_EXEC 4 /* executing command tree */
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#define E_LOOP 5 /* executing for/while # */
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#define E_ERRH 6 /* general error handler # */
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/* # indicates env has valid jbuf (see unwind()) */
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/* struct env.flag values */
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#define EF_FUNC_PARSE BIT(0) /* function being parsed */
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#define EF_BRKCONT_PASS BIT(1) /* set if E_LOOP must pass break/continue on */
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#define EF_FAKE_SIGDIE BIT(2) /* hack to get info from unwind to quitenv */
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/* Do breaks/continues stop at env type e? */
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#define STOP_BRKCONT(t) ((t) == E_NONE || (t) == E_PARSE \
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|| (t) == E_FUNC || (t) == E_INCL)
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/* Do returns stop at env type e? */
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#define STOP_RETURN(t) ((t) == E_FUNC || (t) == E_INCL)
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/* values for ksh_siglongjmp(e->jbuf, 0) */
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#define LRETURN 1 /* return statement */
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#define LEXIT 2 /* exit statement */
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#define LERROR 3 /* errorf() called */
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#define LLEAVE 4 /* untrappable exit/error */
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#define LINTR 5 /* ^C noticed */
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#define LBREAK 6 /* break statement */
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#define LCONTIN 7 /* continue statement */
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#define LSHELL 8 /* return to interactive shell() */
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#define LAEXPR 9 /* error in arithmetic expression */
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/* option processing */
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#define OF_CMDLINE 0x01 /* command line */
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#define OF_SET 0x02 /* set builtin */
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#define OF_SPECIAL 0x04 /* a special variable changing */
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#define OF_INTERNAL 0x08 /* set internally by shell */
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#define OF_ANY (OF_CMDLINE | OF_SET | OF_SPECIAL | OF_INTERNAL)
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struct option {
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const char *name; /* long name of option */
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char c; /* character flag (if any) */
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short flags; /* OF_* */
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};
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extern const struct option goptions[];
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/*
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* flags (the order of these enums MUST match the order in misc.c(options[]))
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*/
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enum sh_flag {
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FEXPORT = 0, /* -a: export all */
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#ifdef BRACE_EXPAND
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FBRACEEXPAND, /* enable {} globbing */
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#endif
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FBGNICE, /* bgnice */
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FCOMMAND, /* -c: (invocation) execute specified command */
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#ifdef EMACS
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FEMACS, /* emacs command editing */
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FEMACSUSEMETA, /* use 8th bit as meta */
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#endif
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FERREXIT, /* -e: quit on error */
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#ifdef EMACS
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FGMACS, /* gmacs command editing */
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#endif
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FIGNOREEOF, /* eof does not exit */
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FTALKING, /* -i: interactive */
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FKEYWORD, /* -k: name=value anywhere */
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FLOGIN, /* -l: a login shell */
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FMARKDIRS, /* mark dirs with / in file name completion */
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FMONITOR, /* -m: job control monitoring */
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FNOCLOBBER, /* -C: don't overwrite existing files */
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FNOEXEC, /* -n: don't execute any commands */
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FNOGLOB, /* -f: don't do file globbing */
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FNOHUP, /* -H: don't kill running jobs when login shell exits */
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FNOLOG, /* don't save functions in history (ignored) */
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#ifdef JOBS
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FNOTIFY, /* -b: asynchronous job completion notification */
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#endif
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FNOUNSET, /* -u: using an unset var is an error */
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FPHYSICAL, /* -o physical: don't do logical cd's/pwd's */
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FPOSIX, /* -o posix: be posixly correct */
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FPRIVILEGED, /* -p: use suid_profile */
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FRESTRICTED, /* -r: restricted shell */
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FSTDIN, /* -s: (invocation) parse stdin */
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FTRACKALL, /* -h: create tracked aliases for all commands */
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FVERBOSE, /* -v: echo input */
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#ifdef VI
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FVI, /* vi command editing */
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FVIRAW, /* always read in raw mode (ignored) */
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FVISHOW8, /* display chars with 8th bit set as is (versus M-) */
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FVITABCOMPLETE, /* enable tab as file name completion char */
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FVIESCCOMPLETE, /* enable ESC as file name completion in command mode */
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#endif
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FXTRACE, /* -x: execution trace */
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FTALKING_I, /* (internal): initial shell was interactive */
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FNFLAGS /* (place holder: how many flags are there) */
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};
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#define Flag(f) (shell_flags[(int) (f)])
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EXTERN char shell_flags [FNFLAGS];
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EXTERN char null [] I__(""); /* null value for variable */
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EXTERN char space [] I__(" ");
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EXTERN char newline [] I__("\n");
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EXTERN char slash [] I__("/");
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enum temp_type {
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TT_HEREDOC_EXP, /* expanded heredoc */
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TT_HIST_EDIT /* temp file used for history editing (fc -e) */
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};
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typedef enum temp_type Temp_type;
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/* temp/heredoc files. The file is removed when the struct is freed. */
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struct temp {
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struct temp *next;
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struct shf *shf;
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int pid; /* pid of process parsed here-doc */
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Temp_type type;
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char *name;
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};
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/*
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* stdio and our IO routines
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*/
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#define shl_spare (&shf_iob[0]) /* for c_read()/c_print() */
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#define shl_stdout (&shf_iob[1])
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#define shl_out (&shf_iob[2])
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EXTERN int shl_stdout_ok;
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/*
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* trap handlers
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*/
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typedef struct trap {
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int signal; /* signal number */
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const char *name; /* short name */
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const char *mess; /* descriptive name */
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char *trap; /* trap command */
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int volatile set; /* trap pending */
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int flags; /* TF_* */
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handler_t cursig; /* current handler (valid if TF_ORIG_* set) */
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handler_t shtrap; /* shell signal handler */
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} Trap;
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/* values for Trap.flags */
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#define TF_SHELL_USES BIT(0) /* shell uses signal, user can't change */
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#define TF_USER_SET BIT(1) /* user has (tried to) set trap */
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#define TF_ORIG_IGN BIT(2) /* original action was SIG_IGN */
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#define TF_ORIG_DFL BIT(3) /* original action was SIG_DFL */
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#define TF_EXEC_IGN BIT(4) /* restore SIG_IGN just before exec */
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#define TF_EXEC_DFL BIT(5) /* restore SIG_DFL just before exec */
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#define TF_DFL_INTR BIT(6) /* when received, default action is LINTR */
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#define TF_TTY_INTR BIT(7) /* tty generated signal (see j_waitj) */
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#define TF_CHANGED BIT(8) /* used by runtrap() to detect trap changes */
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#define TF_FATAL BIT(9) /* causes termination if not trapped */
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/* values for setsig()/setexecsig() flags argument */
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#define SS_RESTORE_MASK 0x3 /* how to restore a signal before an exec() */
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#define SS_RESTORE_CURR 0 /* leave current handler in place */
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#define SS_RESTORE_ORIG 1 /* restore original handler */
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#define SS_RESTORE_DFL 2 /* restore to SIG_DFL */
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#define SS_RESTORE_IGN 3 /* restore to SIG_IGN */
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#define SS_FORCE BIT(3) /* set signal even if original signal ignored */
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#define SS_USER BIT(4) /* user is doing the set (ie, trap command) */
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#define SS_SHTRAP BIT(5) /* trap for internal use (CHLD,ALRM,WINCH) */
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#define SIGEXIT_ 0 /* for trap EXIT */
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#define SIGERR_ SIGNALS /* for trap ERR */
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EXTERN int volatile trap; /* traps pending? */
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EXTERN int volatile intrsig; /* pending trap interrupts executing command */
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EXTERN int volatile fatal_trap;/* received a fatal signal */
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extern Trap sigtraps[SIGNALS+1];
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#ifdef KSH
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/*
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* TMOUT support
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*/
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/* values for ksh_tmout_state */
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enum tmout_enum {
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TMOUT_EXECUTING = 0, /* executing commands */
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TMOUT_READING, /* waiting for input */
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TMOUT_LEAVING /* have timed out */
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};
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EXTERN unsigned int ksh_tmout;
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EXTERN enum tmout_enum ksh_tmout_state I__(TMOUT_EXECUTING);
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#endif /* KSH */
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/* For "You have stopped jobs" message */
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EXTERN int really_exit;
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/*
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* fast character classes
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*/
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#define C_ALPHA BIT(0) /* a-z_A-Z */
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#define C_DIGIT BIT(1) /* 0-9 */
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#define C_LEX1 BIT(2) /* \0 \t\n|&;<>() */
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#define C_VAR1 BIT(3) /* *@#!$-? */
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#define C_IFSWS BIT(4) /* \t \n (IFS white space) */
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#define C_SUBOP1 BIT(5) /* "=-+?" */
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#define C_SUBOP2 BIT(6) /* "#%" */
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#define C_IFS BIT(7) /* $IFS */
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#define C_QUOTE BIT(8) /* \n\t"#$&'()*;<>?[\`| (needing quoting) */
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extern short ctypes [];
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#define ctype(c, t) !!(ctypes[(unsigned char)(c)]&(t))
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#define letter(c) ctype(c, C_ALPHA)
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#define digit(c) ctype(c, C_DIGIT)
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#define letnum(c) ctype(c, C_ALPHA|C_DIGIT)
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EXTERN int ifs0 I__(' '); /* for "$*" */
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/* Argument parsing for built-in commands and getopts command */
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/* Values for Getopt.flags */
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#define GF_ERROR BIT(0) /* call errorf() if there is an error */
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#define GF_PLUSOPT BIT(1) /* allow +c as an option */
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#define GF_NONAME BIT(2) /* don't print argv[0] in errors */
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/* Values for Getopt.info */
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#define GI_MINUS BIT(0) /* an option started with -... */
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#define GI_PLUS BIT(1) /* an option started with +... */
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#define GI_MINUSMINUS BIT(2) /* arguments were ended with -- */
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typedef struct {
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int optind;
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int uoptind;/* what user sees in $OPTIND */
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char *optarg;
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int flags; /* see GF_* */
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int info; /* see GI_* */
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unsigned int p; /* 0 or index into argv[optind - 1] */
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char buf[2]; /* for bad option OPTARG value */
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} Getopt;
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EXTERN Getopt builtin_opt; /* for shell builtin commands */
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EXTERN Getopt user_opt; /* parsing state for getopts builtin command */
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#ifdef KSH
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/* This for co-processes */
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typedef int_least32_t Coproc_id; /* something that won't (realisticly) wrap */
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struct coproc {
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int read; /* pipe from co-process's stdout */
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int readw; /* other side of read (saved temporarily) */
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int write; /* pipe to co-process's stdin */
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Coproc_id id; /* id of current output pipe */
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int njobs; /* number of live jobs using output pipe */
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void *job; /* 0 or job of co-process using input pipe */
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};
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EXTERN struct coproc coproc;
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#endif /* KSH */
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/* Used in jobs.c and by coprocess stuff in exec.c */
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EXTERN sigset_t sm_default, sm_sigchld;
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extern char ksh_version[];
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/* name of called builtin function (used by error functions) */
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EXTERN char *builtin_argv0;
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EXTERN Tflag builtin_flag; /* flags of called builtin (SPEC_BI, etc.) */
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/* current working directory, and size of memory allocated for same */
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EXTERN char *current_wd;
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EXTERN int current_wd_size;
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#ifdef EDIT
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/* Minimum required space to work with on a line - if the prompt leaves less
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* space than this on a line, the prompt is truncated.
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*/
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# define MIN_EDIT_SPACE 7
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/* Minimum allowed value for x_cols: 2 for prompt, 3 for " < " at end of line
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*/
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# define MIN_COLS (2 + MIN_EDIT_SPACE + 3)
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EXTERN int x_cols I__(80); /* tty columns */
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#else
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# define x_cols 80 /* for pr_menu(exec.c) */
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#endif
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/* These to avoid bracket matching problems */
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#define OPAREN '('
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#define CPAREN ')'
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#define OBRACK '['
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#define CBRACK ']'
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#define OBRACE '{'
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#define CBRACE '}'
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/* Determine the location of the system (common) profile */
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#ifndef KSH_SYSTEM_PROFILE
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# define KSH_SYSTEM_PROFILE "/etc/profile"
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#endif /* KSH_SYSTEM_PROFILE */
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/* Used by v_evaluate() and setstr() to control action when error occurs */
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#define KSH_UNWIND_ERROR 0 /* unwind the stack (longjmp) */
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#define KSH_RETURN_ERROR 1 /* return 1/0 for success/failure */
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#include "shf.h"
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#include "table.h"
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#include "tree.h"
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#include "expand.h"
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#include "lex.h"
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#include "proto.h"
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/* be sure not to interfere with anyone else's idea about EXTERN */
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#ifdef EXTERN_DEFINED
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# undef EXTERN_DEFINED
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# undef EXTERN
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#endif
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#undef I__
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