1804 lines
40 KiB
C
1804 lines
40 KiB
C
/* $OpenBSD: lex.c,v 1.51 2015/09/10 22:48:58 nicm Exp $ */
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/*-
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* Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
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* 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
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* mirabilos <m@mirbsd.org>
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*
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* Provided that these terms and disclaimer and all copyright notices
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* are retained or reproduced in an accompanying document, permission
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* is granted to deal in this work without restriction, including un-
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* limited rights to use, publicly perform, distribute, sell, modify,
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* merge, give away, or sublicence.
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*
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* This work is provided "AS IS" and WITHOUT WARRANTY of any kind, to
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* the utmost extent permitted by applicable law, neither express nor
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* implied; without malicious intent or gross negligence. In no event
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* may a licensor, author or contributor be held liable for indirect,
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* direct, other damage, loss, or other issues arising in any way out
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* of dealing in the work, even if advised of the possibility of such
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* damage or existence of a defect, except proven that it results out
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* of said person's immediate fault when using the work as intended.
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*/
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#include "sh.h"
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__RCSID("$MirOS: src/bin/mksh/lex.c,v 1.243 2018/01/14 00:22:28 tg Exp $");
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/*
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* states while lexing word
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*/
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#define SBASE 0 /* outside any lexical constructs */
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#define SWORD 1 /* implicit quoting for substitute() */
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#define SLETPAREN 2 /* inside (( )), implicit quoting */
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#define SSQUOTE 3 /* inside '' */
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#define SDQUOTE 4 /* inside "" */
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#define SEQUOTE 5 /* inside $'' */
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#define SBRACE 6 /* inside ${} */
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#define SQBRACE 7 /* inside "${}" */
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||
#define SBQUOTE 8 /* inside `` */
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||
#define SASPAREN 9 /* inside $(( )) */
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||
#define SHEREDELIM 10 /* parsing << or <<- delimiter */
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||
#define SHEREDQUOTE 11 /* parsing " in << or <<- delimiter */
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||
#define SPATTERN 12 /* parsing *(...|...) pattern (*+?@!) */
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#define SADELIM 13 /* like SBASE, looking for delimiter */
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#define STBRACEKORN 14 /* parsing ${...[#%]...} !FSH */
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||
#define STBRACEBOURNE 15 /* parsing ${...[#%]...} FSH */
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||
#define SINVALID 255 /* invalid state */
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struct sretrace_info {
|
||
struct sretrace_info *next;
|
||
XString xs;
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||
char *xp;
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||
};
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/*
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* Structure to keep track of the lexing state and the various pieces of info
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* needed for each particular state.
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*/
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typedef struct lex_state {
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union {
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/* point to the next state block */
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struct lex_state *base;
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/* marks start of state output in output string */
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size_t start;
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||
/* SBQUOTE: true if in double quotes: "`...`" */
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/* SEQUOTE: got NUL, ignore rest of string */
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bool abool;
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/* SADELIM information */
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struct {
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/* character to search for */
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unsigned char delimiter;
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/* max. number of delimiters */
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unsigned char num;
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} adelim;
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} u;
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/* count open parentheses */
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short nparen;
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/* type of this state */
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uint8_t type;
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} Lex_state;
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#define ls_base u.base
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#define ls_start u.start
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#define ls_bool u.abool
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#define ls_adelim u.adelim
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typedef struct {
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Lex_state *base;
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Lex_state *end;
|
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} State_info;
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static void readhere(struct ioword *);
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static void ungetsc(int);
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static void ungetsc_i(int);
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static int getsc_uu(void);
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static void getsc_line(Source *);
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static int getsc_bn(void);
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static int getsc_i(void);
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static char *get_brace_var(XString *, char *);
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static bool arraysub(char **);
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static void gethere(void);
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static Lex_state *push_state_i(State_info *, Lex_state *);
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static Lex_state *pop_state_i(State_info *, Lex_state *);
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||
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static int backslash_skip;
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static int ignore_backslash_newline;
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/* optimised getsc_bn() */
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#define o_getsc() (*source->str != '\0' && *source->str != '\\' && \
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!backslash_skip ? *source->str++ : getsc_bn())
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/* optimised getsc_uu() */
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#define o_getsc_u() ((*source->str != '\0') ? *source->str++ : getsc_uu())
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/* retrace helper */
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#define o_getsc_r(carg) \
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int cev = (carg); \
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||
struct sretrace_info *rp = retrace_info; \
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\
|
||
while (rp) { \
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Xcheck(rp->xs, rp->xp); \
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*rp->xp++ = cev; \
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rp = rp->next; \
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} \
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\
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return (cev);
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/* callback */
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static int
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getsc_i(void)
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{
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o_getsc_r(o_getsc());
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}
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/*XXX
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* getsc() result is supposed to be ord()ed right now,
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* but results sometimes aren't handled correctly; re‐
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* check CVS history for *that* change and fix it
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*/
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#if defined(MKSH_SMALL) && !defined(MKSH_SMALL_BUT_FAST)
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#define getsc() getsc_i()
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#else
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static int getsc_r(int);
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static int
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getsc_r(int c)
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{
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o_getsc_r(c);
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}
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#define getsc() getsc_r(o_getsc())
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#endif
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#define STATE_BSIZE 8
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#define PUSH_STATE(s) do { \
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if (++statep == state_info.end) \
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statep = push_state_i(&state_info, statep); \
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state = statep->type = (s); \
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} while (/* CONSTCOND */ 0)
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#define POP_STATE() do { \
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if (--statep == state_info.base) \
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statep = pop_state_i(&state_info, statep); \
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state = statep->type; \
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} while (/* CONSTCOND */ 0)
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#define PUSH_SRETRACE(s) do { \
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struct sretrace_info *ri; \
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\
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PUSH_STATE(s); \
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statep->ls_start = Xsavepos(ws, wp); \
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ri = alloc(sizeof(struct sretrace_info), ATEMP); \
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Xinit(ri->xs, ri->xp, 64, ATEMP); \
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ri->next = retrace_info; \
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retrace_info = ri; \
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} while (/* CONSTCOND */ 0)
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#define POP_SRETRACE() do { \
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wp = Xrestpos(ws, wp, statep->ls_start); \
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*retrace_info->xp = '\0'; \
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sp = Xstring(retrace_info->xs, retrace_info->xp); \
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dp = (void *)retrace_info; \
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retrace_info = retrace_info->next; \
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afree(dp, ATEMP); \
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POP_STATE(); \
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} while (/* CONSTCOND */ 0)
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/**
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* Lexical analyser
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*
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* tokens are not regular expressions, they are LL(1).
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* for example, "${var:-${PWD}}", and "$(size $(whence ksh))".
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* hence the state stack. Note "$(...)" are now parsed recursively.
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*/
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int
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yylex(int cf)
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{
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Lex_state states[STATE_BSIZE], *statep, *s2, *base;
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State_info state_info;
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int c, c2, state;
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size_t cz;
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XString ws; /* expandable output word */
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char *wp; /* output word pointer */
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char *sp, *dp;
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Again:
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states[0].type = SINVALID;
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states[0].ls_base = NULL;
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statep = &states[1];
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state_info.base = states;
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state_info.end = &state_info.base[STATE_BSIZE];
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Xinit(ws, wp, 64, ATEMP);
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backslash_skip = 0;
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ignore_backslash_newline = 0;
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if (cf & ONEWORD)
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state = SWORD;
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else if (cf & LETEXPR) {
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/* enclose arguments in (double) quotes */
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*wp++ = OQUOTE;
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state = SLETPAREN;
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statep->nparen = 0;
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} else {
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/* normal lexing */
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state = (cf & HEREDELIM) ? SHEREDELIM : SBASE;
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while (ctype((c = getsc()), C_BLANK))
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;
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if (ord(c) == '#') {
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ignore_backslash_newline++;
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while (!ctype((c = getsc()), C_NUL | C_LF))
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;
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ignore_backslash_newline--;
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}
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ungetsc(c);
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}
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if (source->flags & SF_ALIAS) {
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/* trailing ' ' in alias definition */
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source->flags &= ~SF_ALIAS;
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/* POSIX: trailing space only counts if parsing simple cmd */
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if (!Flag(FPOSIX) || (cf & CMDWORD))
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cf |= ALIAS;
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}
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/* Initial state: one of SWORD SLETPAREN SHEREDELIM SBASE */
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statep->type = state;
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/* collect non-special or quoted characters to form word */
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while (!((c = getsc()) == 0 ||
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((state == SBASE || state == SHEREDELIM) && cinttype(c, C_LEX1)))) {
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||
if (state == SBASE &&
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subshell_nesting_type == ORD(/*{*/ '}') &&
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(unsigned int)c == ORD(/*{*/ '}'))
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/* possibly end ${ :;} */
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break;
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Xcheck(ws, wp);
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switch (state) {
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case SADELIM:
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if ((unsigned int)c == ORD('('))
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||
statep->nparen++;
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else if ((unsigned int)c == ORD(')'))
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statep->nparen--;
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else if (statep->nparen == 0 &&
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((unsigned int)c == ORD(/*{*/ '}') ||
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c == (int)statep->ls_adelim.delimiter)) {
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||
*wp++ = ADELIM;
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||
*wp++ = c;
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||
if ((unsigned int)c == ORD(/*{*/ '}') ||
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--statep->ls_adelim.num == 0)
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||
POP_STATE();
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||
if ((unsigned int)c == ORD(/*{*/ '}'))
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||
POP_STATE();
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||
break;
|
||
}
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||
/* FALLTHROUGH */
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||
case SBASE:
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||
if ((unsigned int)c == ORD('[') && (cf & CMDASN)) {
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||
/* temporary */
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||
*wp = EOS;
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||
if (is_wdvarname(Xstring(ws, wp), false)) {
|
||
char *p, *tmp;
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||
|
||
if (arraysub(&tmp)) {
|
||
*wp++ = CHAR;
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||
*wp++ = c;
|
||
for (p = tmp; *p; ) {
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||
Xcheck(ws, wp);
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||
*wp++ = CHAR;
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||
*wp++ = *p++;
|
||
}
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||
afree(tmp, ATEMP);
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||
break;
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||
}
|
||
}
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||
*wp++ = CHAR;
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||
*wp++ = c;
|
||
break;
|
||
}
|
||
/* FALLTHROUGH */
|
||
Sbase1: /* includes *(...|...) pattern (*+?@!) */
|
||
if (cinttype(c, C_PATMO)) {
|
||
c2 = getsc();
|
||
if ((unsigned int)c2 == ORD('(' /*)*/)) {
|
||
*wp++ = OPAT;
|
||
*wp++ = c;
|
||
PUSH_STATE(SPATTERN);
|
||
break;
|
||
}
|
||
ungetsc(c2);
|
||
}
|
||
/* FALLTHROUGH */
|
||
Sbase2: /* doesn't include *(...|...) pattern (*+?@!) */
|
||
switch (c) {
|
||
case ORD('\\'):
|
||
getsc_qchar:
|
||
if ((c = getsc())) {
|
||
/* trailing \ is lost */
|
||
*wp++ = QCHAR;
|
||
*wp++ = c;
|
||
}
|
||
break;
|
||
case ORD('\''):
|
||
open_ssquote_unless_heredoc:
|
||
if ((cf & HEREDOC))
|
||
goto store_char;
|
||
*wp++ = OQUOTE;
|
||
ignore_backslash_newline++;
|
||
PUSH_STATE(SSQUOTE);
|
||
break;
|
||
case ORD('"'):
|
||
open_sdquote:
|
||
*wp++ = OQUOTE;
|
||
PUSH_STATE(SDQUOTE);
|
||
break;
|
||
case ORD('$'):
|
||
/*
|
||
* processing of dollar sign belongs into
|
||
* Subst, except for those which can open
|
||
* a string: $'…' and $"…"
|
||
*/
|
||
subst_dollar_ex:
|
||
c = getsc();
|
||
switch (c) {
|
||
case ORD('"'):
|
||
goto open_sdquote;
|
||
case ORD('\''):
|
||
goto open_sequote;
|
||
default:
|
||
goto SubstS;
|
||
}
|
||
default:
|
||
goto Subst;
|
||
}
|
||
break;
|
||
|
||
Subst:
|
||
switch (c) {
|
||
case ORD('\\'):
|
||
c = getsc();
|
||
switch (c) {
|
||
case ORD('"'):
|
||
if ((cf & HEREDOC))
|
||
goto heredocquote;
|
||
/* FALLTHROUGH */
|
||
case ORD('\\'):
|
||
case ORD('$'):
|
||
case ORD('`'):
|
||
store_qchar:
|
||
*wp++ = QCHAR;
|
||
*wp++ = c;
|
||
break;
|
||
default:
|
||
heredocquote:
|
||
Xcheck(ws, wp);
|
||
if (c) {
|
||
/* trailing \ is lost */
|
||
*wp++ = CHAR;
|
||
*wp++ = '\\';
|
||
*wp++ = CHAR;
|
||
*wp++ = c;
|
||
}
|
||
break;
|
||
}
|
||
break;
|
||
case ORD('$'):
|
||
c = getsc();
|
||
SubstS:
|
||
if ((unsigned int)c == ORD('(' /*)*/)) {
|
||
c = getsc();
|
||
if ((unsigned int)c == ORD('(' /*)*/)) {
|
||
*wp++ = EXPRSUB;
|
||
PUSH_SRETRACE(SASPAREN);
|
||
statep->nparen = 2;
|
||
*retrace_info->xp++ = '(';
|
||
} else {
|
||
ungetsc(c);
|
||
subst_command:
|
||
c = COMSUB;
|
||
subst_command2:
|
||
sp = yyrecursive(c);
|
||
cz = strlen(sp) + 1;
|
||
XcheckN(ws, wp, cz);
|
||
*wp++ = c;
|
||
memcpy(wp, sp, cz);
|
||
wp += cz;
|
||
}
|
||
} else if ((unsigned int)c == ORD('{' /*}*/)) {
|
||
if ((unsigned int)(c = getsc()) == ORD('|')) {
|
||
/*
|
||
* non-subenvironment
|
||
* value substitution
|
||
*/
|
||
c = VALSUB;
|
||
goto subst_command2;
|
||
} else if (ctype(c, C_IFSWS)) {
|
||
/*
|
||
* non-subenvironment
|
||
* "command" substitution
|
||
*/
|
||
c = FUNSUB;
|
||
goto subst_command2;
|
||
}
|
||
ungetsc(c);
|
||
*wp++ = OSUBST;
|
||
*wp++ = '{' /*}*/;
|
||
wp = get_brace_var(&ws, wp);
|
||
c = getsc();
|
||
/* allow :# and :% (ksh88 compat) */
|
||
if ((unsigned int)c == ORD(':')) {
|
||
*wp++ = CHAR;
|
||
*wp++ = c;
|
||
c = getsc();
|
||
if ((unsigned int)c == ORD(':')) {
|
||
*wp++ = CHAR;
|
||
*wp++ = '0';
|
||
*wp++ = ADELIM;
|
||
*wp++ = ':';
|
||
PUSH_STATE(SBRACE);
|
||
PUSH_STATE(SADELIM);
|
||
statep->ls_adelim.delimiter = ':';
|
||
statep->ls_adelim.num = 1;
|
||
statep->nparen = 0;
|
||
break;
|
||
} else if (ctype(c, C_DIGIT | C_DOLAR | C_SPC) ||
|
||
/*XXX what else? */
|
||
c == '(' /*)*/) {
|
||
/* substring subst. */
|
||
if (c != ' ') {
|
||
*wp++ = CHAR;
|
||
*wp++ = ' ';
|
||
}
|
||
ungetsc(c);
|
||
PUSH_STATE(SBRACE);
|
||
PUSH_STATE(SADELIM);
|
||
statep->ls_adelim.delimiter = ':';
|
||
statep->ls_adelim.num = 2;
|
||
statep->nparen = 0;
|
||
break;
|
||
}
|
||
} else if (c == '/') {
|
||
c2 = ADELIM;
|
||
parse_adelim_slash:
|
||
*wp++ = CHAR;
|
||
*wp++ = c;
|
||
if ((unsigned int)(c = getsc()) == ORD('/')) {
|
||
*wp++ = c2;
|
||
*wp++ = c;
|
||
} else
|
||
ungetsc(c);
|
||
PUSH_STATE(SBRACE);
|
||
PUSH_STATE(SADELIM);
|
||
statep->ls_adelim.delimiter = '/';
|
||
statep->ls_adelim.num = 1;
|
||
statep->nparen = 0;
|
||
break;
|
||
} else if (c == '@') {
|
||
c2 = getsc();
|
||
ungetsc(c2);
|
||
if ((unsigned int)c2 == ORD('/')) {
|
||
c2 = CHAR;
|
||
goto parse_adelim_slash;
|
||
}
|
||
}
|
||
/*
|
||
* If this is a trim operation,
|
||
* treat (,|,) specially in STBRACE.
|
||
*/
|
||
if (ctype(c, C_SUB2)) {
|
||
ungetsc(c);
|
||
if (Flag(FSH))
|
||
PUSH_STATE(STBRACEBOURNE);
|
||
else
|
||
PUSH_STATE(STBRACEKORN);
|
||
} else {
|
||
ungetsc(c);
|
||
if (state == SDQUOTE ||
|
||
state == SQBRACE)
|
||
PUSH_STATE(SQBRACE);
|
||
else
|
||
PUSH_STATE(SBRACE);
|
||
}
|
||
} else if (ctype(c, C_ALPHX)) {
|
||
*wp++ = OSUBST;
|
||
*wp++ = 'X';
|
||
do {
|
||
Xcheck(ws, wp);
|
||
*wp++ = c;
|
||
c = getsc();
|
||
} while (ctype(c, C_ALNUX));
|
||
*wp++ = '\0';
|
||
*wp++ = CSUBST;
|
||
*wp++ = 'X';
|
||
ungetsc(c);
|
||
} else if (ctype(c, C_VAR1 | C_DIGIT)) {
|
||
Xcheck(ws, wp);
|
||
*wp++ = OSUBST;
|
||
*wp++ = 'X';
|
||
*wp++ = c;
|
||
*wp++ = '\0';
|
||
*wp++ = CSUBST;
|
||
*wp++ = 'X';
|
||
} else {
|
||
*wp++ = CHAR;
|
||
*wp++ = '$';
|
||
ungetsc(c);
|
||
}
|
||
break;
|
||
case ORD('`'):
|
||
subst_gravis:
|
||
PUSH_STATE(SBQUOTE);
|
||
*wp++ = COMASUB;
|
||
/*
|
||
* We need to know whether we are within double
|
||
* quotes in order to translate \" to " within
|
||
* "…`…\"…`…" because, unlike for COMSUBs, the
|
||
* outer double quoteing changes the backslash
|
||
* meaning for the inside. For more details:
|
||
* http://austingroupbugs.net/view.php?id=1015
|
||
*/
|
||
statep->ls_bool = false;
|
||
s2 = statep;
|
||
base = state_info.base;
|
||
while (/* CONSTCOND */ 1) {
|
||
for (; s2 != base; s2--) {
|
||
if (s2->type == SDQUOTE) {
|
||
statep->ls_bool = true;
|
||
break;
|
||
}
|
||
}
|
||
if (s2 != base)
|
||
break;
|
||
if (!(s2 = s2->ls_base))
|
||
break;
|
||
base = s2-- - STATE_BSIZE;
|
||
}
|
||
break;
|
||
case QCHAR:
|
||
if (cf & LQCHAR) {
|
||
*wp++ = QCHAR;
|
||
*wp++ = getsc();
|
||
break;
|
||
}
|
||
/* FALLTHROUGH */
|
||
default:
|
||
store_char:
|
||
*wp++ = CHAR;
|
||
*wp++ = c;
|
||
}
|
||
break;
|
||
|
||
case SEQUOTE:
|
||
if ((unsigned int)c == ORD('\'')) {
|
||
POP_STATE();
|
||
*wp++ = CQUOTE;
|
||
ignore_backslash_newline--;
|
||
} else if ((unsigned int)c == ORD('\\')) {
|
||
if ((c2 = unbksl(true, getsc_i, ungetsc)) == -1)
|
||
c2 = getsc();
|
||
if (c2 == 0)
|
||
statep->ls_bool = true;
|
||
if (!statep->ls_bool) {
|
||
char ts[4];
|
||
|
||
if ((unsigned int)c2 < 0x100) {
|
||
*wp++ = QCHAR;
|
||
*wp++ = c2;
|
||
} else {
|
||
cz = utf_wctomb(ts, c2 - 0x100);
|
||
ts[cz] = 0;
|
||
cz = 0;
|
||
do {
|
||
*wp++ = QCHAR;
|
||
*wp++ = ts[cz];
|
||
} while (ts[++cz]);
|
||
}
|
||
}
|
||
} else if (!statep->ls_bool) {
|
||
*wp++ = QCHAR;
|
||
*wp++ = c;
|
||
}
|
||
break;
|
||
|
||
case SSQUOTE:
|
||
if ((unsigned int)c == ORD('\'')) {
|
||
POP_STATE();
|
||
if ((cf & HEREDOC) || state == SQBRACE)
|
||
goto store_char;
|
||
*wp++ = CQUOTE;
|
||
ignore_backslash_newline--;
|
||
} else {
|
||
*wp++ = QCHAR;
|
||
*wp++ = c;
|
||
}
|
||
break;
|
||
|
||
case SDQUOTE:
|
||
if ((unsigned int)c == ORD('"')) {
|
||
POP_STATE();
|
||
*wp++ = CQUOTE;
|
||
} else
|
||
goto Subst;
|
||
break;
|
||
|
||
/* $(( ... )) */
|
||
case SASPAREN:
|
||
if ((unsigned int)c == ORD('('))
|
||
statep->nparen++;
|
||
else if ((unsigned int)c == ORD(')')) {
|
||
statep->nparen--;
|
||
if (statep->nparen == 1) {
|
||
/* end of EXPRSUB */
|
||
POP_SRETRACE();
|
||
|
||
if ((unsigned int)(c2 = getsc()) == ORD(/*(*/ ')')) {
|
||
cz = strlen(sp) - 2;
|
||
XcheckN(ws, wp, cz);
|
||
memcpy(wp, sp + 1, cz);
|
||
wp += cz;
|
||
afree(sp, ATEMP);
|
||
*wp++ = '\0';
|
||
break;
|
||
} else {
|
||
Source *s;
|
||
|
||
ungetsc(c2);
|
||
/*
|
||
* mismatched parenthesis -
|
||
* assume we were really
|
||
* parsing a $(...) expression
|
||
*/
|
||
--wp;
|
||
s = pushs(SREREAD,
|
||
source->areap);
|
||
s->start = s->str =
|
||
s->u.freeme = sp;
|
||
s->next = source;
|
||
source = s;
|
||
goto subst_command;
|
||
}
|
||
}
|
||
}
|
||
/* reuse existing state machine */
|
||
goto Sbase2;
|
||
|
||
case SQBRACE:
|
||
if ((unsigned int)c == ORD('\\')) {
|
||
/*
|
||
* perform POSIX "quote removal" if the back-
|
||
* slash is "special", i.e. same cases as the
|
||
* {case '\\':} in Subst: plus closing brace;
|
||
* in mksh code "quote removal" on '\c' means
|
||
* write QCHAR+c, otherwise CHAR+\+CHAR+c are
|
||
* emitted (in heredocquote:)
|
||
*/
|
||
if ((unsigned int)(c = getsc()) == ORD('"') ||
|
||
(unsigned int)c == ORD('\\') ||
|
||
ctype(c, C_DOLAR | C_GRAVE) ||
|
||
(unsigned int)c == ORD(/*{*/ '}'))
|
||
goto store_qchar;
|
||
goto heredocquote;
|
||
}
|
||
goto common_SQBRACE;
|
||
|
||
case SBRACE:
|
||
if ((unsigned int)c == ORD('\''))
|
||
goto open_ssquote_unless_heredoc;
|
||
else if ((unsigned int)c == ORD('\\'))
|
||
goto getsc_qchar;
|
||
common_SQBRACE:
|
||
if ((unsigned int)c == ORD('"'))
|
||
goto open_sdquote;
|
||
else if ((unsigned int)c == ORD('$'))
|
||
goto subst_dollar_ex;
|
||
else if ((unsigned int)c == ORD('`'))
|
||
goto subst_gravis;
|
||
else if ((unsigned int)c != ORD(/*{*/ '}'))
|
||
goto store_char;
|
||
POP_STATE();
|
||
*wp++ = CSUBST;
|
||
*wp++ = /*{*/ '}';
|
||
break;
|
||
|
||
/* Same as SBASE, except (,|,) treated specially */
|
||
case STBRACEKORN:
|
||
if ((unsigned int)c == ORD('|'))
|
||
*wp++ = SPAT;
|
||
else if ((unsigned int)c == ORD('(')) {
|
||
*wp++ = OPAT;
|
||
/* simile for @ */
|
||
*wp++ = ' ';
|
||
PUSH_STATE(SPATTERN);
|
||
} else /* FALLTHROUGH */
|
||
case STBRACEBOURNE:
|
||
if ((unsigned int)c == ORD(/*{*/ '}')) {
|
||
POP_STATE();
|
||
*wp++ = CSUBST;
|
||
*wp++ = /*{*/ '}';
|
||
} else
|
||
goto Sbase1;
|
||
break;
|
||
|
||
case SBQUOTE:
|
||
if ((unsigned int)c == ORD('`')) {
|
||
*wp++ = 0;
|
||
POP_STATE();
|
||
} else if ((unsigned int)c == ORD('\\')) {
|
||
switch (c = getsc()) {
|
||
case 0:
|
||
/* trailing \ is lost */
|
||
break;
|
||
case ORD('$'):
|
||
case ORD('`'):
|
||
case ORD('\\'):
|
||
*wp++ = c;
|
||
break;
|
||
case ORD('"'):
|
||
if (statep->ls_bool) {
|
||
*wp++ = c;
|
||
break;
|
||
}
|
||
/* FALLTHROUGH */
|
||
default:
|
||
*wp++ = '\\';
|
||
*wp++ = c;
|
||
break;
|
||
}
|
||
} else
|
||
*wp++ = c;
|
||
break;
|
||
|
||
/* ONEWORD */
|
||
case SWORD:
|
||
goto Subst;
|
||
|
||
/* LETEXPR: (( ... )) */
|
||
case SLETPAREN:
|
||
if ((unsigned int)c == ORD(/*(*/ ')')) {
|
||
if (statep->nparen > 0)
|
||
--statep->nparen;
|
||
else if ((unsigned int)(c2 = getsc()) == ORD(/*(*/ ')')) {
|
||
c = 0;
|
||
*wp++ = CQUOTE;
|
||
goto Done;
|
||
} else {
|
||
Source *s;
|
||
|
||
ungetsc(c2);
|
||
ungetsc(c);
|
||
/*
|
||
* mismatched parenthesis -
|
||
* assume we were really
|
||
* parsing a (...) expression
|
||
*/
|
||
*wp = EOS;
|
||
sp = Xstring(ws, wp);
|
||
dp = wdstrip(sp + 1, WDS_TPUTS);
|
||
s = pushs(SREREAD, source->areap);
|
||
s->start = s->str = s->u.freeme = dp;
|
||
s->next = source;
|
||
source = s;
|
||
ungetsc('(' /*)*/);
|
||
return (ORD('(' /*)*/));
|
||
}
|
||
} else if ((unsigned int)c == ORD('('))
|
||
/*
|
||
* parentheses inside quotes and
|
||
* backslashes are lost, but AT&T ksh
|
||
* doesn't count them either
|
||
*/
|
||
++statep->nparen;
|
||
goto Sbase2;
|
||
|
||
/* << or <<- delimiter */
|
||
case SHEREDELIM:
|
||
/*
|
||
* here delimiters need a special case since
|
||
* $ and `...` are not to be treated specially
|
||
*/
|
||
switch (c) {
|
||
case ORD('\\'):
|
||
if ((c = getsc())) {
|
||
/* trailing \ is lost */
|
||
*wp++ = QCHAR;
|
||
*wp++ = c;
|
||
}
|
||
break;
|
||
case ORD('\''):
|
||
goto open_ssquote_unless_heredoc;
|
||
case ORD('$'):
|
||
if ((unsigned int)(c2 = getsc()) == ORD('\'')) {
|
||
open_sequote:
|
||
*wp++ = OQUOTE;
|
||
ignore_backslash_newline++;
|
||
PUSH_STATE(SEQUOTE);
|
||
statep->ls_bool = false;
|
||
break;
|
||
} else if ((unsigned int)c2 == ORD('"')) {
|
||
/* FALLTHROUGH */
|
||
case ORD('"'):
|
||
PUSH_SRETRACE(SHEREDQUOTE);
|
||
break;
|
||
}
|
||
ungetsc(c2);
|
||
/* FALLTHROUGH */
|
||
default:
|
||
*wp++ = CHAR;
|
||
*wp++ = c;
|
||
}
|
||
break;
|
||
|
||
/* " in << or <<- delimiter */
|
||
case SHEREDQUOTE:
|
||
if ((unsigned int)c != ORD('"'))
|
||
goto Subst;
|
||
POP_SRETRACE();
|
||
dp = strnul(sp) - 1;
|
||
/* remove the trailing double quote */
|
||
*dp = '\0';
|
||
/* store the quoted string */
|
||
*wp++ = OQUOTE;
|
||
XcheckN(ws, wp, (dp - sp) * 2);
|
||
dp = sp;
|
||
while ((c = *dp++)) {
|
||
if (c == '\\') {
|
||
switch ((c = *dp++)) {
|
||
case ORD('\\'):
|
||
case ORD('"'):
|
||
case ORD('$'):
|
||
case ORD('`'):
|
||
break;
|
||
default:
|
||
*wp++ = CHAR;
|
||
*wp++ = '\\';
|
||
break;
|
||
}
|
||
}
|
||
*wp++ = CHAR;
|
||
*wp++ = c;
|
||
}
|
||
afree(sp, ATEMP);
|
||
*wp++ = CQUOTE;
|
||
state = statep->type = SHEREDELIM;
|
||
break;
|
||
|
||
/* in *(...|...) pattern (*+?@!) */
|
||
case SPATTERN:
|
||
if ((unsigned int)c == ORD(/*(*/ ')')) {
|
||
*wp++ = CPAT;
|
||
POP_STATE();
|
||
} else if ((unsigned int)c == ORD('|')) {
|
||
*wp++ = SPAT;
|
||
} else if ((unsigned int)c == ORD('(')) {
|
||
*wp++ = OPAT;
|
||
/* simile for @ */
|
||
*wp++ = ' ';
|
||
PUSH_STATE(SPATTERN);
|
||
} else
|
||
goto Sbase1;
|
||
break;
|
||
}
|
||
}
|
||
Done:
|
||
Xcheck(ws, wp);
|
||
if (statep != &states[1])
|
||
/* XXX figure out what is missing */
|
||
yyerror("no closing quote");
|
||
|
||
/* This done to avoid tests for SHEREDELIM wherever SBASE tested */
|
||
if (state == SHEREDELIM)
|
||
state = SBASE;
|
||
|
||
dp = Xstring(ws, wp);
|
||
if (state == SBASE && (
|
||
(c == '&' && !Flag(FSH) && !Flag(FPOSIX)) ||
|
||
ctype(c, C_ANGLE)) && ((c2 = Xlength(ws, wp)) == 0 ||
|
||
(c2 == 2 && dp[0] == CHAR && ctype(dp[1], C_DIGIT)))) {
|
||
struct ioword *iop = alloc(sizeof(struct ioword), ATEMP);
|
||
|
||
iop->unit = c2 == 2 ? ksh_numdig(dp[1]) : c == '<' ? 0 : 1;
|
||
|
||
if (c == '&') {
|
||
if ((unsigned int)(c2 = getsc()) != ORD('>')) {
|
||
ungetsc(c2);
|
||
goto no_iop;
|
||
}
|
||
c = c2;
|
||
iop->ioflag = IOBASH;
|
||
} else
|
||
iop->ioflag = 0;
|
||
|
||
c2 = getsc();
|
||
/* <<, >>, <> are ok, >< is not */
|
||
if (c == c2 || ((unsigned int)c == ORD('<') &&
|
||
(unsigned int)c2 == ORD('>'))) {
|
||
iop->ioflag |= c == c2 ?
|
||
((unsigned int)c == ORD('>') ? IOCAT : IOHERE) : IORDWR;
|
||
if (iop->ioflag == IOHERE) {
|
||
if ((unsigned int)(c2 = getsc()) == ORD('-'))
|
||
iop->ioflag |= IOSKIP;
|
||
else if ((unsigned int)c2 == ORD('<'))
|
||
iop->ioflag |= IOHERESTR;
|
||
else
|
||
ungetsc(c2);
|
||
}
|
||
} else if ((unsigned int)c2 == ORD('&'))
|
||
iop->ioflag |= IODUP | ((unsigned int)c == ORD('<') ? IORDUP : 0);
|
||
else {
|
||
iop->ioflag |= (unsigned int)c == ORD('>') ? IOWRITE : IOREAD;
|
||
if ((unsigned int)c == ORD('>') && (unsigned int)c2 == ORD('|'))
|
||
iop->ioflag |= IOCLOB;
|
||
else
|
||
ungetsc(c2);
|
||
}
|
||
|
||
iop->ioname = NULL;
|
||
iop->delim = NULL;
|
||
iop->heredoc = NULL;
|
||
/* free word */
|
||
Xfree(ws, wp);
|
||
yylval.iop = iop;
|
||
return (REDIR);
|
||
no_iop:
|
||
afree(iop, ATEMP);
|
||
}
|
||
|
||
if (wp == dp && state == SBASE) {
|
||
/* free word */
|
||
Xfree(ws, wp);
|
||
/* no word, process LEX1 character */
|
||
if (((unsigned int)c == ORD('|')) ||
|
||
((unsigned int)c == ORD('&')) ||
|
||
((unsigned int)c == ORD(';')) ||
|
||
((unsigned int)c == ORD('(' /*)*/))) {
|
||
if ((c2 = getsc()) == c)
|
||
c = ((unsigned int)c == ORD(';')) ? BREAK :
|
||
((unsigned int)c == ORD('|')) ? LOGOR :
|
||
((unsigned int)c == ORD('&')) ? LOGAND :
|
||
/* (unsigned int)c == ORD('(' )) */ MDPAREN;
|
||
else if ((unsigned int)c == ORD('|') && (unsigned int)c2 == ORD('&'))
|
||
c = COPROC;
|
||
else if ((unsigned int)c == ORD(';') && (unsigned int)c2 == ORD('|'))
|
||
c = BRKEV;
|
||
else if ((unsigned int)c == ORD(';') && (unsigned int)c2 == ORD('&'))
|
||
c = BRKFT;
|
||
else
|
||
ungetsc(c2);
|
||
#ifndef MKSH_SMALL
|
||
if (c == BREAK) {
|
||
if ((unsigned int)(c2 = getsc()) == ORD('&'))
|
||
c = BRKEV;
|
||
else
|
||
ungetsc(c2);
|
||
}
|
||
#endif
|
||
} else if ((unsigned int)c == ORD('\n')) {
|
||
if (cf & HEREDELIM)
|
||
ungetsc(c);
|
||
else {
|
||
gethere();
|
||
if (cf & CONTIN)
|
||
goto Again;
|
||
}
|
||
} else if (c == '\0' && !(cf & HEREDELIM)) {
|
||
struct ioword **p = heres;
|
||
|
||
while (p < herep)
|
||
if ((*p)->ioflag & IOHERESTR)
|
||
++p;
|
||
else
|
||
/* ksh -c 'cat <<EOF' can cause this */
|
||
yyerror(Tf_heredoc,
|
||
evalstr((*p)->delim, 0));
|
||
}
|
||
return (c);
|
||
}
|
||
|
||
/* terminate word */
|
||
*wp++ = EOS;
|
||
yylval.cp = Xclose(ws, wp);
|
||
if (state == SWORD || state == SLETPAREN
|
||
/* XXX ONEWORD? */)
|
||
return (LWORD);
|
||
|
||
/* unget terminator */
|
||
ungetsc(c);
|
||
|
||
/*
|
||
* note: the alias-vs-function code below depends on several
|
||
* interna: starting from here, source->str is not modified;
|
||
* the way getsc() and ungetsc() operate; etc.
|
||
*/
|
||
|
||
/* copy word to unprefixed string ident */
|
||
sp = yylval.cp;
|
||
dp = ident;
|
||
while ((dp - ident) < IDENT && (c = *sp++) == CHAR)
|
||
*dp++ = *sp++;
|
||
if (c != EOS)
|
||
/* word is not unquoted, or space ran out */
|
||
dp = ident;
|
||
/* make sure the ident array stays NUL padded */
|
||
memset(dp, 0, (ident + IDENT) - dp + 1);
|
||
|
||
if (*ident != '\0' && (cf & (KEYWORD | ALIAS))) {
|
||
struct tbl *p;
|
||
uint32_t h = hash(ident);
|
||
|
||
if ((cf & KEYWORD) && (p = ktsearch(&keywords, ident, h)) &&
|
||
(!(cf & ESACONLY) || p->val.i == ESAC ||
|
||
(unsigned int)p->val.i == ORD(/*{*/ '}'))) {
|
||
afree(yylval.cp, ATEMP);
|
||
return (p->val.i);
|
||
}
|
||
if ((cf & ALIAS) && (p = ktsearch(&aliases, ident, h)) &&
|
||
(p->flag & ISSET)) {
|
||
/*
|
||
* this still points to the same character as the
|
||
* ungetsc'd terminator from above
|
||
*/
|
||
const char *cp = source->str;
|
||
|
||
/* prefer POSIX but not Korn functions over aliases */
|
||
while (ctype(*cp, C_BLANK))
|
||
/*
|
||
* this is like getsc() without skipping
|
||
* over Source boundaries (including not
|
||
* parsing ungetsc'd characters that got
|
||
* pushed into an SREREAD) which is what
|
||
* we want here anyway: find out whether
|
||
* the alias name is followed by a POSIX
|
||
* function definition
|
||
*/
|
||
++cp;
|
||
/* prefer functions over aliases */
|
||
if (cp[0] != '(' || cp[1] != ')') {
|
||
Source *s = source;
|
||
|
||
while (s && (s->flags & SF_HASALIAS))
|
||
if (s->u.tblp == p)
|
||
return (LWORD);
|
||
else
|
||
s = s->next;
|
||
/* push alias expansion */
|
||
s = pushs(SALIAS, source->areap);
|
||
s->start = s->str = p->val.s;
|
||
s->u.tblp = p;
|
||
s->flags |= SF_HASALIAS;
|
||
s->line = source->line;
|
||
s->next = source;
|
||
if (source->type == SEOF) {
|
||
/* prevent infinite recursion at EOS */
|
||
source->u.tblp = p;
|
||
source->flags |= SF_HASALIAS;
|
||
}
|
||
source = s;
|
||
afree(yylval.cp, ATEMP);
|
||
goto Again;
|
||
}
|
||
}
|
||
} else if (*ident == '\0') {
|
||
/* retain typeset et al. even when quoted */
|
||
struct tbl *tt = get_builtin((dp = wdstrip(yylval.cp, 0)));
|
||
uint32_t flag = tt ? tt->flag : 0;
|
||
|
||
if (flag & (DECL_UTIL | DECL_FWDR))
|
||
strlcpy(ident, dp, sizeof(ident));
|
||
afree(dp, ATEMP);
|
||
}
|
||
|
||
return (LWORD);
|
||
}
|
||
|
||
static void
|
||
gethere(void)
|
||
{
|
||
struct ioword **p;
|
||
|
||
for (p = heres; p < herep; p++)
|
||
if (!((*p)->ioflag & IOHERESTR))
|
||
readhere(*p);
|
||
herep = heres;
|
||
}
|
||
|
||
/*
|
||
* read "<<word" text into temp file
|
||
*/
|
||
|
||
static void
|
||
readhere(struct ioword *iop)
|
||
{
|
||
int c;
|
||
const char *eof, *eofp;
|
||
XString xs;
|
||
char *xp;
|
||
size_t xpos;
|
||
|
||
eof = evalstr(iop->delim, 0);
|
||
|
||
if (!(iop->ioflag & IOEVAL))
|
||
ignore_backslash_newline++;
|
||
|
||
Xinit(xs, xp, 256, ATEMP);
|
||
|
||
heredoc_read_line:
|
||
/* beginning of line */
|
||
eofp = eof;
|
||
xpos = Xsavepos(xs, xp);
|
||
if (iop->ioflag & IOSKIP) {
|
||
/* skip over leading tabs */
|
||
while ((c = getsc()) == '\t')
|
||
; /* nothing */
|
||
goto heredoc_parse_char;
|
||
}
|
||
heredoc_read_char:
|
||
c = getsc();
|
||
heredoc_parse_char:
|
||
/* compare with here document marker */
|
||
if (!*eofp) {
|
||
/* end of here document marker, what to do? */
|
||
switch (c) {
|
||
case ORD(/*(*/ ')'):
|
||
if (!subshell_nesting_type)
|
||
/*-
|
||
* not allowed outside $(...) or (...)
|
||
* => mismatch
|
||
*/
|
||
break;
|
||
/* allow $(...) or (...) to close here */
|
||
ungetsc(/*(*/ ')');
|
||
/* FALLTHROUGH */
|
||
case 0:
|
||
/*
|
||
* Allow EOF here to commands without trailing
|
||
* newlines (mksh -c '...') will work as well.
|
||
*/
|
||
case ORD('\n'):
|
||
/* Newline terminates here document marker */
|
||
goto heredoc_found_terminator;
|
||
}
|
||
} else if (c == *eofp++)
|
||
/* store; then read and compare next character */
|
||
goto heredoc_store_and_loop;
|
||
/* nope, mismatch; read until end of line */
|
||
while (c != '\n') {
|
||
if (!c)
|
||
/* oops, reached EOF */
|
||
yyerror(Tf_heredoc, eof);
|
||
/* store character */
|
||
Xcheck(xs, xp);
|
||
Xput(xs, xp, c);
|
||
/* read next character */
|
||
c = getsc();
|
||
}
|
||
/* we read a newline as last character */
|
||
heredoc_store_and_loop:
|
||
/* store character */
|
||
Xcheck(xs, xp);
|
||
Xput(xs, xp, c);
|
||
if (c == '\n')
|
||
goto heredoc_read_line;
|
||
goto heredoc_read_char;
|
||
|
||
heredoc_found_terminator:
|
||
/* jump back to saved beginning of line */
|
||
xp = Xrestpos(xs, xp, xpos);
|
||
/* terminate, close and store */
|
||
Xput(xs, xp, '\0');
|
||
iop->heredoc = Xclose(xs, xp);
|
||
|
||
if (!(iop->ioflag & IOEVAL))
|
||
ignore_backslash_newline--;
|
||
}
|
||
|
||
void
|
||
yyerror(const char *fmt, ...)
|
||
{
|
||
va_list va;
|
||
|
||
/* pop aliases and re-reads */
|
||
while (source->type == SALIAS || source->type == SREREAD)
|
||
source = source->next;
|
||
/* zap pending input */
|
||
source->str = null;
|
||
|
||
error_prefix(true);
|
||
va_start(va, fmt);
|
||
shf_vfprintf(shl_out, fmt, va);
|
||
shf_putc('\n', shl_out);
|
||
va_end(va);
|
||
errorfz();
|
||
}
|
||
|
||
/*
|
||
* input for yylex with alias expansion
|
||
*/
|
||
|
||
Source *
|
||
pushs(int type, Area *areap)
|
||
{
|
||
Source *s;
|
||
|
||
s = alloc(sizeof(Source), areap);
|
||
memset(s, 0, sizeof(Source));
|
||
s->type = type;
|
||
s->str = null;
|
||
s->areap = areap;
|
||
if (type == SFILE || type == SSTDIN)
|
||
XinitN(s->xs, 256, s->areap);
|
||
return (s);
|
||
}
|
||
|
||
static int
|
||
getsc_uu(void)
|
||
{
|
||
Source *s = source;
|
||
int c;
|
||
|
||
while ((c = ord(*s->str++)) == 0) {
|
||
/* return 0 for EOF by default */
|
||
s->str = NULL;
|
||
switch (s->type) {
|
||
case SEOF:
|
||
s->str = null;
|
||
return (0);
|
||
|
||
case SSTDIN:
|
||
case SFILE:
|
||
getsc_line(s);
|
||
break;
|
||
|
||
case SWSTR:
|
||
break;
|
||
|
||
case SSTRING:
|
||
case SSTRINGCMDLINE:
|
||
break;
|
||
|
||
case SWORDS:
|
||
s->start = s->str = *s->u.strv++;
|
||
s->type = SWORDSEP;
|
||
break;
|
||
|
||
case SWORDSEP:
|
||
if (*s->u.strv == NULL) {
|
||
s->start = s->str = "\n";
|
||
s->type = SEOF;
|
||
} else {
|
||
s->start = s->str = T1space;
|
||
s->type = SWORDS;
|
||
}
|
||
break;
|
||
|
||
case SALIAS:
|
||
if (s->flags & SF_ALIASEND) {
|
||
/* pass on an unused SF_ALIAS flag */
|
||
source = s->next;
|
||
source->flags |= s->flags & SF_ALIAS;
|
||
s = source;
|
||
} else if (*s->u.tblp->val.s &&
|
||
ctype((c = strnul(s->u.tblp->val.s)[-1]), C_SPACE)) {
|
||
/* pop source stack */
|
||
source = s = s->next;
|
||
/*
|
||
* Note that this alias ended with a
|
||
* space, enabling alias expansion on
|
||
* the following word.
|
||
*/
|
||
s->flags |= SF_ALIAS;
|
||
} else {
|
||
/*
|
||
* At this point, we need to keep the current
|
||
* alias in the source list so recursive
|
||
* aliases can be detected and we also need to
|
||
* return the next character. Do this by
|
||
* temporarily popping the alias to get the
|
||
* next character and then put it back in the
|
||
* source list with the SF_ALIASEND flag set.
|
||
*/
|
||
/* pop source stack */
|
||
source = s->next;
|
||
source->flags |= s->flags & SF_ALIAS;
|
||
c = getsc_uu();
|
||
if (c) {
|
||
s->flags |= SF_ALIASEND;
|
||
s->ugbuf[0] = c; s->ugbuf[1] = '\0';
|
||
s->start = s->str = s->ugbuf;
|
||
s->next = source;
|
||
source = s;
|
||
} else {
|
||
s = source;
|
||
/* avoid reading EOF twice */
|
||
s->str = NULL;
|
||
break;
|
||
}
|
||
}
|
||
continue;
|
||
|
||
case SREREAD:
|
||
if (s->start != s->ugbuf)
|
||
/* yuck */
|
||
afree(s->u.freeme, ATEMP);
|
||
source = s = s->next;
|
||
continue;
|
||
}
|
||
if (s->str == NULL) {
|
||
s->type = SEOF;
|
||
s->start = s->str = null;
|
||
return ('\0');
|
||
}
|
||
if (s->flags & SF_ECHO) {
|
||
shf_puts(s->str, shl_out);
|
||
shf_flush(shl_out);
|
||
}
|
||
}
|
||
return (c);
|
||
}
|
||
|
||
static void
|
||
getsc_line(Source *s)
|
||
{
|
||
char *xp = Xstring(s->xs, xp), *cp;
|
||
bool interactive = Flag(FTALKING) && s->type == SSTDIN;
|
||
bool have_tty = tobool(interactive && (s->flags & SF_TTY));
|
||
|
||
/* Done here to ensure nothing odd happens when a timeout occurs */
|
||
XcheckN(s->xs, xp, LINE);
|
||
*xp = '\0';
|
||
s->start = s->str = xp;
|
||
|
||
if (have_tty && ksh_tmout) {
|
||
ksh_tmout_state = TMOUT_READING;
|
||
alarm(ksh_tmout);
|
||
}
|
||
if (interactive) {
|
||
if (cur_prompt == PS1)
|
||
histsave(&s->line, NULL, HIST_FLUSH, true);
|
||
change_winsz();
|
||
}
|
||
#ifndef MKSH_NO_CMDLINE_EDITING
|
||
if (have_tty && (
|
||
#if !MKSH_S_NOVI
|
||
Flag(FVI) ||
|
||
#endif
|
||
Flag(FEMACS) || Flag(FGMACS))) {
|
||
int nread;
|
||
|
||
nread = x_read(xp);
|
||
if (nread < 0)
|
||
/* read error */
|
||
nread = 0;
|
||
xp[nread] = '\0';
|
||
xp += nread;
|
||
} else
|
||
#endif
|
||
{
|
||
if (interactive)
|
||
pprompt(prompt, 0);
|
||
else
|
||
s->line++;
|
||
|
||
while (/* CONSTCOND */ 1) {
|
||
char *p = shf_getse(xp, Xnleft(s->xs, xp), s->u.shf);
|
||
|
||
if (!p && shf_error(s->u.shf) &&
|
||
shf_errno(s->u.shf) == EINTR) {
|
||
shf_clearerr(s->u.shf);
|
||
if (trap)
|
||
runtraps(0);
|
||
continue;
|
||
}
|
||
if (!p || (xp = p, xp[-1] == '\n'))
|
||
break;
|
||
/* double buffer size */
|
||
/* move past NUL so doubling works... */
|
||
xp++;
|
||
XcheckN(s->xs, xp, Xlength(s->xs, xp));
|
||
/* ...and move back again */
|
||
xp--;
|
||
}
|
||
/*
|
||
* flush any unwanted input so other programs/builtins
|
||
* can read it. Not very optimal, but less error prone
|
||
* than flushing else where, dealing with redirections,
|
||
* etc.
|
||
* TODO: reduce size of shf buffer (~128?) if SSTDIN
|
||
*/
|
||
if (s->type == SSTDIN)
|
||
shf_flush(s->u.shf);
|
||
}
|
||
/*
|
||
* XXX: temporary kludge to restore source after a
|
||
* trap may have been executed.
|
||
*/
|
||
source = s;
|
||
if (have_tty && ksh_tmout) {
|
||
ksh_tmout_state = TMOUT_EXECUTING;
|
||
alarm(0);
|
||
}
|
||
cp = Xstring(s->xs, xp);
|
||
rndpush(cp);
|
||
s->start = s->str = cp;
|
||
strip_nuls(Xstring(s->xs, xp), Xlength(s->xs, xp));
|
||
/* Note: if input is all nulls, this is not eof */
|
||
if (Xlength(s->xs, xp) == 0) {
|
||
/* EOF */
|
||
if (s->type == SFILE)
|
||
shf_fdclose(s->u.shf);
|
||
s->str = NULL;
|
||
} else if (interactive && *s->str) {
|
||
if (cur_prompt != PS1)
|
||
histsave(&s->line, s->str, HIST_APPEND, true);
|
||
else if (!ctype(*s->str, C_IFS | C_IFSWS))
|
||
histsave(&s->line, s->str, HIST_QUEUE, true);
|
||
#if !defined(MKSH_SMALL) && HAVE_PERSISTENT_HISTORY
|
||
else
|
||
goto check_for_sole_return;
|
||
} else if (interactive && cur_prompt == PS1) {
|
||
check_for_sole_return:
|
||
cp = Xstring(s->xs, xp);
|
||
while (ctype(*cp, C_IFSWS))
|
||
++cp;
|
||
if (!*cp) {
|
||
histsave(&s->line, NULL, HIST_FLUSH, true);
|
||
histsync();
|
||
}
|
||
#endif
|
||
}
|
||
if (interactive)
|
||
set_prompt(PS2, NULL);
|
||
}
|
||
|
||
void
|
||
set_prompt(int to, Source *s)
|
||
{
|
||
cur_prompt = (uint8_t)to;
|
||
|
||
switch (to) {
|
||
/* command */
|
||
case PS1:
|
||
/*
|
||
* Substitute ! and !! here, before substitutions are done
|
||
* so ! in expanded variables are not expanded.
|
||
* NOTE: this is not what AT&T ksh does (it does it after
|
||
* substitutions, POSIX doesn't say which is to be done.
|
||
*/
|
||
{
|
||
struct shf *shf;
|
||
char * volatile ps1;
|
||
Area *saved_atemp;
|
||
int saved_lineno;
|
||
|
||
ps1 = str_val(global("PS1"));
|
||
shf = shf_sopen(NULL, strlen(ps1) * 2,
|
||
SHF_WR | SHF_DYNAMIC, NULL);
|
||
while (*ps1)
|
||
if (*ps1 != '!' || *++ps1 == '!')
|
||
shf_putchar(*ps1++, shf);
|
||
else
|
||
shf_fprintf(shf, Tf_lu, s ?
|
||
(unsigned long)s->line + 1 : 0UL);
|
||
ps1 = shf_sclose(shf);
|
||
saved_lineno = current_lineno;
|
||
if (s)
|
||
current_lineno = s->line + 1;
|
||
saved_atemp = ATEMP;
|
||
newenv(E_ERRH);
|
||
if (kshsetjmp(e->jbuf)) {
|
||
prompt = safe_prompt;
|
||
/*
|
||
* Don't print an error - assume it has already
|
||
* been printed. Reason is we may have forked
|
||
* to run a command and the child may be
|
||
* unwinding its stack through this code as it
|
||
* exits.
|
||
*/
|
||
} else {
|
||
char *cp = substitute(ps1, 0);
|
||
strdupx(prompt, cp, saved_atemp);
|
||
}
|
||
current_lineno = saved_lineno;
|
||
quitenv(NULL);
|
||
}
|
||
break;
|
||
/* command continuation */
|
||
case PS2:
|
||
prompt = str_val(global("PS2"));
|
||
break;
|
||
}
|
||
}
|
||
|
||
int
|
||
pprompt(const char *cp, int ntruncate)
|
||
{
|
||
char delimiter = 0;
|
||
bool doprint = (ntruncate != -1);
|
||
bool indelimit = false;
|
||
int columns = 0, lines = 0;
|
||
|
||
/*
|
||
* Undocumented AT&T ksh feature:
|
||
* If the second char in the prompt string is \r then the first
|
||
* char is taken to be a non-printing delimiter and any chars
|
||
* between two instances of the delimiter are not considered to
|
||
* be part of the prompt length
|
||
*/
|
||
if (*cp && cp[1] == '\r') {
|
||
delimiter = *cp;
|
||
cp += 2;
|
||
}
|
||
for (; *cp; cp++) {
|
||
if (indelimit && *cp != delimiter)
|
||
;
|
||
else if (ctype(*cp, C_CR | C_LF)) {
|
||
lines += columns / x_cols + ((*cp == '\n') ? 1 : 0);
|
||
columns = 0;
|
||
} else if (*cp == '\t') {
|
||
columns = (columns | 7) + 1;
|
||
} else if (*cp == '\b') {
|
||
if (columns > 0)
|
||
columns--;
|
||
} else if (*cp == delimiter)
|
||
indelimit = !indelimit;
|
||
else if (UTFMODE && (rtt2asc(*cp) > 0x7F)) {
|
||
const char *cp2;
|
||
columns += utf_widthadj(cp, &cp2);
|
||
if (doprint && (indelimit ||
|
||
(ntruncate < (x_cols * lines + columns))))
|
||
shf_write(cp, cp2 - cp, shl_out);
|
||
cp = cp2 - /* loop increment */ 1;
|
||
continue;
|
||
} else
|
||
columns++;
|
||
if (doprint && (*cp != delimiter) &&
|
||
(indelimit || (ntruncate < (x_cols * lines + columns))))
|
||
shf_putc(*cp, shl_out);
|
||
}
|
||
if (doprint)
|
||
shf_flush(shl_out);
|
||
return (x_cols * lines + columns);
|
||
}
|
||
|
||
/*
|
||
* Read the variable part of a ${...} expression (i.e. up to but not
|
||
* including the :[-+?=#%] or close-brace).
|
||
*/
|
||
static char *
|
||
get_brace_var(XString *wsp, char *wp)
|
||
{
|
||
char c;
|
||
enum parse_state {
|
||
PS_INITIAL, PS_SAW_PERCENT, PS_SAW_HASH, PS_SAW_BANG,
|
||
PS_IDENT, PS_NUMBER, PS_VAR1
|
||
} state = PS_INITIAL;
|
||
|
||
while (/* CONSTCOND */ 1) {
|
||
c = getsc();
|
||
/* State machine to figure out where the variable part ends. */
|
||
switch (state) {
|
||
case PS_SAW_HASH:
|
||
if (ctype(c, C_VAR1)) {
|
||
char c2;
|
||
|
||
c2 = getsc();
|
||
ungetsc(c2);
|
||
if (ord(c2) != ORD(/*{*/ '}')) {
|
||
ungetsc(c);
|
||
goto out;
|
||
}
|
||
}
|
||
goto ps_common;
|
||
case PS_SAW_BANG:
|
||
switch (ord(c)) {
|
||
case ORD('@'):
|
||
case ORD('#'):
|
||
case ORD('-'):
|
||
case ORD('?'):
|
||
goto out;
|
||
}
|
||
goto ps_common;
|
||
case PS_INITIAL:
|
||
switch (ord(c)) {
|
||
case ORD('%'):
|
||
state = PS_SAW_PERCENT;
|
||
goto next;
|
||
case ORD('#'):
|
||
state = PS_SAW_HASH;
|
||
goto next;
|
||
case ORD('!'):
|
||
state = PS_SAW_BANG;
|
||
goto next;
|
||
}
|
||
/* FALLTHROUGH */
|
||
case PS_SAW_PERCENT:
|
||
ps_common:
|
||
if (ctype(c, C_ALPHX))
|
||
state = PS_IDENT;
|
||
else if (ctype(c, C_DIGIT))
|
||
state = PS_NUMBER;
|
||
else if (ctype(c, C_VAR1))
|
||
state = PS_VAR1;
|
||
else
|
||
goto out;
|
||
break;
|
||
case PS_IDENT:
|
||
if (!ctype(c, C_ALNUX)) {
|
||
if (ord(c) == ORD('[')) {
|
||
char *tmp, *p;
|
||
|
||
if (!arraysub(&tmp))
|
||
yyerror("missing ]");
|
||
*wp++ = c;
|
||
p = tmp;
|
||
while (*p) {
|
||
Xcheck(*wsp, wp);
|
||
*wp++ = *p++;
|
||
}
|
||
afree(tmp, ATEMP);
|
||
/* the ] */
|
||
c = getsc();
|
||
}
|
||
goto out;
|
||
}
|
||
next:
|
||
break;
|
||
case PS_NUMBER:
|
||
if (!ctype(c, C_DIGIT))
|
||
goto out;
|
||
break;
|
||
case PS_VAR1:
|
||
goto out;
|
||
}
|
||
Xcheck(*wsp, wp);
|
||
*wp++ = c;
|
||
}
|
||
out:
|
||
/* end of variable part */
|
||
*wp++ = '\0';
|
||
ungetsc(c);
|
||
return (wp);
|
||
}
|
||
|
||
/*
|
||
* Save an array subscript - returns true if matching bracket found, false
|
||
* if eof or newline was found.
|
||
* (Returned string double null terminated)
|
||
*/
|
||
static bool
|
||
arraysub(char **strp)
|
||
{
|
||
XString ws;
|
||
char *wp, c;
|
||
/* we are just past the initial [ */
|
||
unsigned int depth = 1;
|
||
|
||
Xinit(ws, wp, 32, ATEMP);
|
||
|
||
do {
|
||
c = getsc();
|
||
Xcheck(ws, wp);
|
||
*wp++ = c;
|
||
if (ord(c) == ORD('['))
|
||
depth++;
|
||
else if (ord(c) == ORD(']'))
|
||
depth--;
|
||
} while (depth > 0 && c && c != '\n');
|
||
|
||
*wp++ = '\0';
|
||
*strp = Xclose(ws, wp);
|
||
|
||
return (tobool(depth == 0));
|
||
}
|
||
|
||
/* Unget a char: handles case when we are already at the start of the buffer */
|
||
static void
|
||
ungetsc(int c)
|
||
{
|
||
struct sretrace_info *rp = retrace_info;
|
||
|
||
if (backslash_skip)
|
||
backslash_skip--;
|
||
/* Don't unget EOF... */
|
||
if (source->str == null && c == '\0')
|
||
return;
|
||
while (rp) {
|
||
if (Xlength(rp->xs, rp->xp))
|
||
rp->xp--;
|
||
rp = rp->next;
|
||
}
|
||
ungetsc_i(c);
|
||
}
|
||
static void
|
||
ungetsc_i(int c)
|
||
{
|
||
if (source->str > source->start)
|
||
source->str--;
|
||
else {
|
||
Source *s;
|
||
|
||
s = pushs(SREREAD, source->areap);
|
||
s->ugbuf[0] = c; s->ugbuf[1] = '\0';
|
||
s->start = s->str = s->ugbuf;
|
||
s->next = source;
|
||
source = s;
|
||
}
|
||
}
|
||
|
||
|
||
/* Called to get a char that isn't a \newline sequence. */
|
||
static int
|
||
getsc_bn(void)
|
||
{
|
||
int c, c2;
|
||
|
||
if (ignore_backslash_newline)
|
||
return (o_getsc_u());
|
||
|
||
if (backslash_skip == 1) {
|
||
backslash_skip = 2;
|
||
return (o_getsc_u());
|
||
}
|
||
|
||
backslash_skip = 0;
|
||
|
||
while (/* CONSTCOND */ 1) {
|
||
c = o_getsc_u();
|
||
if (c == '\\') {
|
||
if ((c2 = o_getsc_u()) == '\n')
|
||
/* ignore the \newline; get the next char... */
|
||
continue;
|
||
ungetsc_i(c2);
|
||
backslash_skip = 1;
|
||
}
|
||
return (c);
|
||
}
|
||
}
|
||
|
||
void
|
||
yyskiputf8bom(void)
|
||
{
|
||
int c;
|
||
|
||
if (rtt2asc((c = o_getsc_u())) != 0xEF) {
|
||
ungetsc_i(c);
|
||
return;
|
||
}
|
||
if (rtt2asc((c = o_getsc_u())) != 0xBB) {
|
||
ungetsc_i(c);
|
||
ungetsc_i(asc2rtt(0xEF));
|
||
return;
|
||
}
|
||
if (rtt2asc((c = o_getsc_u())) != 0xBF) {
|
||
ungetsc_i(c);
|
||
ungetsc_i(asc2rtt(0xBB));
|
||
ungetsc_i(asc2rtt(0xEF));
|
||
return;
|
||
}
|
||
UTFMODE |= 8;
|
||
}
|
||
|
||
static Lex_state *
|
||
push_state_i(State_info *si, Lex_state *old_end)
|
||
{
|
||
Lex_state *news = alloc2(STATE_BSIZE, sizeof(Lex_state), ATEMP);
|
||
|
||
news[0].ls_base = old_end;
|
||
si->base = &news[0];
|
||
si->end = &news[STATE_BSIZE];
|
||
return (&news[1]);
|
||
}
|
||
|
||
static Lex_state *
|
||
pop_state_i(State_info *si, Lex_state *old_end)
|
||
{
|
||
Lex_state *old_base = si->base;
|
||
|
||
si->base = old_end->ls_base - STATE_BSIZE;
|
||
si->end = old_end->ls_base;
|
||
|
||
afree(old_base, ATEMP);
|
||
|
||
return (si->base + STATE_BSIZE - 1);
|
||
}
|