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lex.yy.c
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#line 3 "lex.yy.c"
#define YY_INT_ALIGNED short int
/* A lexical scanner generated by flex */
#define FLEX_SCANNER
#define YY_FLEX_MAJOR_VERSION 2
#define YY_FLEX_MINOR_VERSION 5
#define YY_FLEX_SUBMINOR_VERSION 39
#if YY_FLEX_SUBMINOR_VERSION > 0
#define FLEX_BETA
#endif
/* First, we deal with platform-specific or compiler-specific issues. */
/* begin standard C headers. */
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
/* end standard C headers. */
/* flex integer type definitions */
#ifndef FLEXINT_H
#define FLEXINT_H
/* C99 systems have <inttypes.h>. Non-C99 systems may or may not. */
#if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
/* C99 says to define __STDC_LIMIT_MACROS before including stdint.h,
* if you want the limit (max/min) macros for int types.
*/
#ifndef __STDC_LIMIT_MACROS
#define __STDC_LIMIT_MACROS 1
#endif
#include <inttypes.h>
typedef int8_t flex_int8_t;
typedef uint8_t flex_uint8_t;
typedef int16_t flex_int16_t;
typedef uint16_t flex_uint16_t;
typedef int32_t flex_int32_t;
typedef uint32_t flex_uint32_t;
#else
typedef signed char flex_int8_t;
typedef short int flex_int16_t;
typedef int flex_int32_t;
typedef unsigned char flex_uint8_t;
typedef unsigned short int flex_uint16_t;
typedef unsigned int flex_uint32_t;
/* Limits of integral types. */
#ifndef INT8_MIN
#define INT8_MIN (-128)
#endif
#ifndef INT16_MIN
#define INT16_MIN (-32767-1)
#endif
#ifndef INT32_MIN
#define INT32_MIN (-2147483647-1)
#endif
#ifndef INT8_MAX
#define INT8_MAX (127)
#endif
#ifndef INT16_MAX
#define INT16_MAX (32767)
#endif
#ifndef INT32_MAX
#define INT32_MAX (2147483647)
#endif
#ifndef UINT8_MAX
#define UINT8_MAX (255U)
#endif
#ifndef UINT16_MAX
#define UINT16_MAX (65535U)
#endif
#ifndef UINT32_MAX
#define UINT32_MAX (4294967295U)
#endif
#endif /* ! C99 */
#endif /* ! FLEXINT_H */
#ifdef __cplusplus
/* The "const" storage-class-modifier is valid. */
#define YY_USE_CONST
#else /* ! __cplusplus */
/* C99 requires __STDC__ to be defined as 1. */
#if defined (__STDC__)
#define YY_USE_CONST
#endif /* defined (__STDC__) */
#endif /* ! __cplusplus */
#ifdef YY_USE_CONST
#define yyconst const
#else
#define yyconst
#endif
/* Returned upon end-of-file. */
#define YY_NULL 0
/* Promotes a possibly negative, possibly signed char to an unsigned
* integer for use as an array index. If the signed char is negative,
* we want to instead treat it as an 8-bit unsigned char, hence the
* double cast.
*/
#define YY_SC_TO_UI(c) ((unsigned int) (unsigned char) c)
/* Enter a start condition. This macro really ought to take a parameter,
* but we do it the disgusting crufty way forced on us by the ()-less
* definition of BEGIN.
*/
#define BEGIN (yy_start) = 1 + 2 *
/* Translate the current start state into a value that can be later handed
* to BEGIN to return to the state. The YYSTATE alias is for lex
* compatibility.
*/
#define YY_START (((yy_start) - 1) / 2)
#define YYSTATE YY_START
/* Action number for EOF rule of a given start state. */
#define YY_STATE_EOF(state) (YY_END_OF_BUFFER + state + 1)
/* Special action meaning "start processing a new file". */
#define YY_NEW_FILE yyrestart(yyin )
#define YY_END_OF_BUFFER_CHAR 0
/* Size of default input buffer. */
#ifndef YY_BUF_SIZE
#define YY_BUF_SIZE 16384
#endif
/* The state buf must be large enough to hold one state per character in the main buffer.
*/
#define YY_STATE_BUF_SIZE ((YY_BUF_SIZE + 2) * sizeof(yy_state_type))
#ifndef YY_TYPEDEF_YY_BUFFER_STATE
#define YY_TYPEDEF_YY_BUFFER_STATE
typedef struct yy_buffer_state *YY_BUFFER_STATE;
#endif
#ifndef YY_TYPEDEF_YY_SIZE_T
#define YY_TYPEDEF_YY_SIZE_T
typedef size_t yy_size_t;
#endif
extern yy_size_t yyleng;
extern FILE *yyin, *yyout;
#define EOB_ACT_CONTINUE_SCAN 0
#define EOB_ACT_END_OF_FILE 1
#define EOB_ACT_LAST_MATCH 2
#define YY_LESS_LINENO(n)
#define YY_LINENO_REWIND_TO(ptr)
/* Return all but the first "n" matched characters back to the input stream. */
#define yyless(n) \
do \
{ \
/* Undo effects of setting up yytext. */ \
int yyless_macro_arg = (n); \
YY_LESS_LINENO(yyless_macro_arg);\
*yy_cp = (yy_hold_char); \
YY_RESTORE_YY_MORE_OFFSET \
(yy_c_buf_p) = yy_cp = yy_bp + yyless_macro_arg - YY_MORE_ADJ; \
YY_DO_BEFORE_ACTION; /* set up yytext again */ \
} \
while ( 0 )
#define unput(c) yyunput( c, (yytext_ptr) )
#ifndef YY_STRUCT_YY_BUFFER_STATE
#define YY_STRUCT_YY_BUFFER_STATE
struct yy_buffer_state
{
FILE *yy_input_file;
char *yy_ch_buf; /* input buffer */
char *yy_buf_pos; /* current position in input buffer */
/* Size of input buffer in bytes, not including room for EOB
* characters.
*/
yy_size_t yy_buf_size;
/* Number of characters read into yy_ch_buf, not including EOB
* characters.
*/
yy_size_t yy_n_chars;
/* Whether we "own" the buffer - i.e., we know we created it,
* and can realloc() it to grow it, and should free() it to
* delete it.
*/
int yy_is_our_buffer;
/* Whether this is an "interactive" input source; if so, and
* if we're using stdio for input, then we want to use getc()
* instead of fread(), to make sure we stop fetching input after
* each newline.
*/
int yy_is_interactive;
/* Whether we're considered to be at the beginning of a line.
* If so, '^' rules will be active on the next match, otherwise
* not.
*/
int yy_at_bol;
int yy_bs_lineno; /**< The line count. */
int yy_bs_column; /**< The column count. */
/* Whether to try to fill the input buffer when we reach the
* end of it.
*/
int yy_fill_buffer;
int yy_buffer_status;
#define YY_BUFFER_NEW 0
#define YY_BUFFER_NORMAL 1
/* When an EOF's been seen but there's still some text to process
* then we mark the buffer as YY_EOF_PENDING, to indicate that we
* shouldn't try reading from the input source any more. We might
* still have a bunch of tokens to match, though, because of
* possible backing-up.
*
* When we actually see the EOF, we change the status to "new"
* (via yyrestart()), so that the user can continue scanning by
* just pointing yyin at a new input file.
*/
#define YY_BUFFER_EOF_PENDING 2
};
#endif /* !YY_STRUCT_YY_BUFFER_STATE */
/* Stack of input buffers. */
static size_t yy_buffer_stack_top = 0; /**< index of top of stack. */
static size_t yy_buffer_stack_max = 0; /**< capacity of stack. */
static YY_BUFFER_STATE * yy_buffer_stack = 0; /**< Stack as an array. */
/* We provide macros for accessing buffer states in case in the
* future we want to put the buffer states in a more general
* "scanner state".
*
* Returns the top of the stack, or NULL.
*/
#define YY_CURRENT_BUFFER ( (yy_buffer_stack) \
? (yy_buffer_stack)[(yy_buffer_stack_top)] \
: NULL)
/* Same as previous macro, but useful when we know that the buffer stack is not
* NULL or when we need an lvalue. For internal use only.
*/
#define YY_CURRENT_BUFFER_LVALUE (yy_buffer_stack)[(yy_buffer_stack_top)]
/* yy_hold_char holds the character lost when yytext is formed. */
static char yy_hold_char;
static yy_size_t yy_n_chars; /* number of characters read into yy_ch_buf */
yy_size_t yyleng;
/* Points to current character in buffer. */
static char *yy_c_buf_p = (char *) 0;
static int yy_init = 0; /* whether we need to initialize */
static int yy_start = 0; /* start state number */
/* Flag which is used to allow yywrap()'s to do buffer switches
* instead of setting up a fresh yyin. A bit of a hack ...
*/
static int yy_did_buffer_switch_on_eof;
void yyrestart (FILE *input_file );
void yy_switch_to_buffer (YY_BUFFER_STATE new_buffer );
YY_BUFFER_STATE yy_create_buffer (FILE *file,int size );
void yy_delete_buffer (YY_BUFFER_STATE b );
void yy_flush_buffer (YY_BUFFER_STATE b );
void yypush_buffer_state (YY_BUFFER_STATE new_buffer );
void yypop_buffer_state (void );
static void yyensure_buffer_stack (void );
static void yy_load_buffer_state (void );
static void yy_init_buffer (YY_BUFFER_STATE b,FILE *file );
#define YY_FLUSH_BUFFER yy_flush_buffer(YY_CURRENT_BUFFER )
YY_BUFFER_STATE yy_scan_buffer (char *base,yy_size_t size );
YY_BUFFER_STATE yy_scan_string (yyconst char *yy_str );
YY_BUFFER_STATE yy_scan_bytes (yyconst char *bytes,yy_size_t len );
void *yyalloc (yy_size_t );
void *yyrealloc (void *,yy_size_t );
void yyfree (void * );
#define yy_new_buffer yy_create_buffer
#define yy_set_interactive(is_interactive) \
{ \
if ( ! YY_CURRENT_BUFFER ){ \
yyensure_buffer_stack (); \
YY_CURRENT_BUFFER_LVALUE = \
yy_create_buffer(yyin,YY_BUF_SIZE ); \
} \
YY_CURRENT_BUFFER_LVALUE->yy_is_interactive = is_interactive; \
}
#define yy_set_bol(at_bol) \
{ \
if ( ! YY_CURRENT_BUFFER ){\
yyensure_buffer_stack (); \
YY_CURRENT_BUFFER_LVALUE = \
yy_create_buffer(yyin,YY_BUF_SIZE ); \
} \
YY_CURRENT_BUFFER_LVALUE->yy_at_bol = at_bol; \
}
#define YY_AT_BOL() (YY_CURRENT_BUFFER_LVALUE->yy_at_bol)
typedef unsigned char YY_CHAR;
FILE *yyin = (FILE *) 0, *yyout = (FILE *) 0;
typedef int yy_state_type;
extern int yylineno;
int yylineno = 1;
extern char *yytext;
#define yytext_ptr yytext
static yy_state_type yy_get_previous_state (void );
static yy_state_type yy_try_NUL_trans (yy_state_type current_state );
static int yy_get_next_buffer (void );
static void yy_fatal_error (yyconst char msg[] );
/* Done after the current pattern has been matched and before the
* corresponding action - sets up yytext.
*/
#define YY_DO_BEFORE_ACTION \
(yytext_ptr) = yy_bp; \
yyleng = (size_t) (yy_cp - yy_bp); \
(yy_hold_char) = *yy_cp; \
*yy_cp = '\0'; \
(yy_c_buf_p) = yy_cp;
#define YY_NUM_RULES 14
#define YY_END_OF_BUFFER 15
/* This struct is not used in this scanner,
but its presence is necessary. */
struct yy_trans_info
{
flex_int32_t yy_verify;
flex_int32_t yy_nxt;
};
static yyconst flex_int16_t yy_accept[54] =
{ 0,
0, 0, 15, 13, 2, 1, 13, 9, 7, 4,
12, 13, 8, 13, 0, 12, 13, 0, 10, 0,
12, 12, 3, 5, 12, 12, 12, 13, 0, 0,
12, 11, 10, 10, 12, 12, 10, 12, 12, 12,
6, 11, 12, 11, 12, 12, 12, 11, 10, 12,
12, 11, 0
} ;
static yyconst flex_int32_t yy_ec[256] =
{ 0,
1, 1, 1, 1, 1, 1, 1, 1, 2, 3,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 2, 1, 4, 1, 1, 1, 5, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 6,
1, 7, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 8, 1, 1, 1, 9, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 10, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1
} ;
static yyconst flex_int32_t yy_meta[11] =
{ 0,
1, 1, 2, 1, 1, 1, 1, 1, 1, 1
} ;
static yyconst flex_int16_t yy_base[56] =
{ 0,
0, 0, 35, 10, 128, 128, 20, 30, 0, 35,
42, 52, 0, 0, 0, 0, 0, 29, 0, 62,
71, 81, 0, 27, 0, 0, 0, 0, 14, 90,
99, 0, 128, 0, 109, 0, 0, 0, 0, 0,
0, 128, 118, 0, 0, 0, 0, 0, 0, 0,
0, 0, 128, 12, 11
} ;
static yyconst flex_int16_t yy_def[56] =
{ 0,
53, 1, 53, 53, 53, 53, 53, 4, 8, 8,
53, 53, 8, 4, 8, 11, 7, 54, 4, 7,
53, 11, 8, 8, 11, 22, 11, 12, 55, 12,
53, 4, 53, 8, 21, 21, 11, 35, 21, 22,
8, 53, 31, 8, 31, 43, 31, 11, 22, 35,
43, 22, 0, 53, 53
} ;
static yyconst flex_int16_t yy_nxt[139] =
{ 0,
4, 5, 6, 7, 8, 9, 10, 11, 12, 13,
14, 29, 18, 14, 15, 15, 15, 16, 14, 15,
17, 18, 42, 19, 20, 20, 20, 21, 17, 20,
15, 41, 33, 15, 53, 53, 53, 22, 15, 23,
53, 24, 25, 53, 53, 25, 26, 26, 26, 27,
25, 26, 28, 29, 53, 28, 30, 30, 30, 31,
32, 30, 20, 53, 53, 34, 53, 53, 53, 35,
20, 36, 18, 53, 37, 38, 38, 38, 39, 36,
38, 26, 53, 53, 26, 53, 53, 53, 40, 26,
30, 53, 53, 30, 53, 53, 53, 43, 44, 45,
29, 53, 45, 46, 46, 46, 47, 48, 46, 38,
53, 53, 49, 53, 53, 53, 50, 38, 46, 53,
53, 46, 53, 53, 53, 51, 52, 3, 53, 53,
53, 53, 53, 53, 53, 53, 53, 53
} ;
static yyconst flex_int16_t yy_chk[139] =
{ 0,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
4, 55, 54, 4, 4, 4, 4, 4, 4, 4,
7, 7, 29, 7, 7, 7, 7, 7, 7, 7,
8, 24, 18, 8, 3, 0, 0, 8, 8, 10,
0, 10, 11, 0, 0, 11, 11, 11, 11, 11,
11, 11, 12, 12, 0, 12, 12, 12, 12, 12,
12, 12, 20, 0, 0, 20, 0, 0, 0, 20,
20, 21, 21, 0, 21, 21, 21, 21, 21, 21,
21, 22, 0, 0, 22, 0, 0, 0, 22, 22,
30, 0, 0, 30, 0, 0, 0, 30, 30, 31,
31, 0, 31, 31, 31, 31, 31, 31, 31, 35,
0, 0, 35, 0, 0, 0, 35, 35, 43, 0,
0, 43, 0, 0, 0, 43, 43, 53, 53, 53,
53, 53, 53, 53, 53, 53, 53, 53
} ;
static yy_state_type yy_last_accepting_state;
static char *yy_last_accepting_cpos;
extern int yy_flex_debug;
int yy_flex_debug = 0;
/* The intent behind this definition is that it'll catch
* any uses of REJECT which flex missed.
*/
#define REJECT reject_used_but_not_detected
#define yymore() yymore_used_but_not_detected
#define YY_MORE_ADJ 0
#define YY_RESTORE_YY_MORE_OFFSET
char *yytext;
#line 1 "shell.l"
/*
*
* CS-252 Fall 2013
* shell.l: lexical analyzer for shell
* You have to extend it.
*
*/
#line 11 "shell.l"
#include <string.h>
#include "y.tab.h"
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
extern "C" char * read_line();
int mygetc(FILE * f) {
static char *p;
char ch;
if (!isatty(0)) {
// stdin is not a tty. Call real get
return getc(f);
}
// stdin is a tty. Call our read_line.
if (p==NULL || *p == 0) {
char * s = read_line();
p = s;
}
ch = *p;
p++;
return ch;
}
#undef getc
#define getc(f) mygetc(f)
static void yyunput (int c,char *buf_ptr );
void myunputc(int c) {
unput(c);
}
#line 537 "lex.yy.c"
#define INITIAL 0
#ifndef YY_NO_UNISTD_H
/* Special case for "unistd.h", since it is non-ANSI. We include it way
* down here because we want the user's section 1 to have been scanned first.
* The user has a chance to override it with an option.
*/
#include <unistd.h>
#endif
#ifndef YY_EXTRA_TYPE
#define YY_EXTRA_TYPE void *
#endif
static int yy_init_globals (void );
/* Accessor methods to globals.
These are made visible to non-reentrant scanners for convenience. */
int yylex_destroy (void );
int yyget_debug (void );
void yyset_debug (int debug_flag );
YY_EXTRA_TYPE yyget_extra (void );
void yyset_extra (YY_EXTRA_TYPE user_defined );
FILE *yyget_in (void );
void yyset_in (FILE * in_str );
FILE *yyget_out (void );
void yyset_out (FILE * out_str );
yy_size_t yyget_leng (void );
char *yyget_text (void );
int yyget_lineno (void );
void yyset_lineno (int line_number );
/* Macros after this point can all be overridden by user definitions in
* section 1.
*/
#ifndef YY_SKIP_YYWRAP
#ifdef __cplusplus
extern "C" int yywrap (void );
#else
extern int yywrap (void );
#endif
#endif
static void yyunput (int c,char *buf_ptr );
#ifndef yytext_ptr
static void yy_flex_strncpy (char *,yyconst char *,int );
#endif
#ifdef YY_NEED_STRLEN
static int yy_flex_strlen (yyconst char * );
#endif
#ifndef YY_NO_INPUT
#ifdef __cplusplus
static int yyinput (void );
#else
static int input (void );
#endif
#endif
/* Amount of stuff to slurp up with each read. */
#ifndef YY_READ_BUF_SIZE
#define YY_READ_BUF_SIZE 8192
#endif
/* Copy whatever the last rule matched to the standard output. */
#ifndef ECHO
/* This used to be an fputs(), but since the string might contain NUL's,
* we now use fwrite().
*/
#define ECHO do { if (fwrite( yytext, yyleng, 1, yyout )) {} } while (0)
#endif
/* Gets input and stuffs it into "buf". number of characters read, or YY_NULL,
* is returned in "result".
*/
#ifndef YY_INPUT
#define YY_INPUT(buf,result,max_size) \
if ( YY_CURRENT_BUFFER_LVALUE->yy_is_interactive ) \
{ \
int c = '*'; \
size_t n; \
for ( n = 0; n < max_size && \
(c = getc( yyin )) != EOF && c != '\n'; ++n ) \
buf[n] = (char) c; \
if ( c == '\n' ) \
buf[n++] = (char) c; \
if ( c == EOF && ferror( yyin ) ) \
YY_FATAL_ERROR( "input in flex scanner failed" ); \
result = n; \
} \
else \
{ \
errno=0; \
while ( (result = fread(buf, 1, max_size, yyin))==0 && ferror(yyin)) \
{ \
if( errno != EINTR) \
{ \
YY_FATAL_ERROR( "input in flex scanner failed" ); \
break; \
} \
errno=0; \
clearerr(yyin); \
} \
}\
\
#endif
/* No semi-colon after return; correct usage is to write "yyterminate();" -
* we don't want an extra ';' after the "return" because that will cause
* some compilers to complain about unreachable statements.
*/
#ifndef yyterminate
#define yyterminate() return YY_NULL
#endif
/* Number of entries by which start-condition stack grows. */
#ifndef YY_START_STACK_INCR
#define YY_START_STACK_INCR 25
#endif
/* Report a fatal error. */
#ifndef YY_FATAL_ERROR
#define YY_FATAL_ERROR(msg) yy_fatal_error( msg )
#endif
/* end tables serialization structures and prototypes */
/* Default declaration of generated scanner - a define so the user can
* easily add parameters.
*/
#ifndef YY_DECL
#define YY_DECL_IS_OURS 1
extern int yylex (void);
#define YY_DECL int yylex (void)
#endif /* !YY_DECL */
/* Code executed at the beginning of each rule, after yytext and yyleng
* have been set up.
*/
#ifndef YY_USER_ACTION
#define YY_USER_ACTION
#endif
/* Code executed at the end of each rule. */
#ifndef YY_BREAK
#define YY_BREAK break;
#endif
#define YY_RULE_SETUP \
YY_USER_ACTION
/** The main scanner function which does all the work.
*/
YY_DECL
{
register yy_state_type yy_current_state;
register char *yy_cp, *yy_bp;
register int yy_act;
if ( !(yy_init) )
{
(yy_init) = 1;
#ifdef YY_USER_INIT
YY_USER_INIT;
#endif
if ( ! (yy_start) )
(yy_start) = 1; /* first start state */
if ( ! yyin )
yyin = stdin;
if ( ! yyout )
yyout = stdout;
if ( ! YY_CURRENT_BUFFER ) {
yyensure_buffer_stack ();
YY_CURRENT_BUFFER_LVALUE =
yy_create_buffer(yyin,YY_BUF_SIZE );
}
yy_load_buffer_state( );
}
{
#line 50 "shell.l"
#line 749 "lex.yy.c"
while ( 1 ) /* loops until end-of-file is reached */
{
yy_cp = (yy_c_buf_p);
/* Support of yytext. */
*yy_cp = (yy_hold_char);
/* yy_bp points to the position in yy_ch_buf of the start of
* the current run.
*/
yy_bp = yy_cp;
yy_current_state = (yy_start);
yy_match:
do
{
register YY_CHAR yy_c = yy_ec[YY_SC_TO_UI(*yy_cp)] ;
if ( yy_accept[yy_current_state] )
{
(yy_last_accepting_state) = yy_current_state;
(yy_last_accepting_cpos) = yy_cp;
}
while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state )
{
yy_current_state = (int) yy_def[yy_current_state];
if ( yy_current_state >= 54 )
yy_c = yy_meta[(unsigned int) yy_c];
}
yy_current_state = yy_nxt[yy_base[yy_current_state] + (unsigned int) yy_c];
++yy_cp;
}
while ( yy_base[yy_current_state] != 128 );
yy_find_action:
yy_act = yy_accept[yy_current_state];
if ( yy_act == 0 )
{ /* have to back up */
yy_cp = (yy_last_accepting_cpos);
yy_current_state = (yy_last_accepting_state);
yy_act = yy_accept[yy_current_state];
}
YY_DO_BEFORE_ACTION;
do_action: /* This label is used only to access EOF actions. */
switch ( yy_act )
{ /* beginning of action switch */
case 0: /* must back up */
/* undo the effects of YY_DO_BEFORE_ACTION */
*yy_cp = (yy_hold_char);
yy_cp = (yy_last_accepting_cpos);
yy_current_state = (yy_last_accepting_state);
goto yy_find_action;
case 1:
/* rule 1 can match eol */
YY_RULE_SETUP
#line 52 "shell.l"
{
return NEWLINE;
}
YY_BREAK
case 2:
YY_RULE_SETUP
#line 56 "shell.l"
{
/* Discard spaces and tabs */
}
YY_BREAK
case 3:
YY_RULE_SETUP
#line 60 "shell.l"
{
return GREATAMP;
}
YY_BREAK
case 4:
YY_RULE_SETUP
#line 65 "shell.l"
{
return GREAT;
}
YY_BREAK
case 5:
YY_RULE_SETUP
#line 69 "shell.l"
{
return GREATGREAT;
}
YY_BREAK
case 6:
YY_RULE_SETUP
#line 73 "shell.l"
{
return GREATGREATAMP;
}
YY_BREAK
case 7:
YY_RULE_SETUP
#line 77 "shell.l"
{
return LESSER;
}
YY_BREAK
case 8:
YY_RULE_SETUP
#line 81 "shell.l"
{
return PIPE;
}
YY_BREAK
case 9:
YY_RULE_SETUP
#line 85 "shell.l"
{
return AMP;
}
YY_BREAK
case 10:
YY_RULE_SETUP
#line 89 "shell.l"
{
/*allows quotes*/
int start = 1;
int end = 1;
end = strlen(yytext)-1;
char *stringer = (char*)calloc(end+1, sizeof(char));
strncpy(stringer, yytext+start, end-1);
yylval.string_val = strdup(stringer);
return WORD;
}
YY_BREAK
case 11:
YY_RULE_SETUP
#line 102 "shell.l"
{
char buff1[1024];
/*allows backticks*/
char checker[1024];
int start = 0;
int end = 0;
while(yytext[start] != '\0'){
if(yytext[start] == '`') {
start++;
}
else {
checker[end] = yytext[start];
end++;
start++;
}
checker[end] = '\n';
strcat(checker, "exit\n");
}
int defin = dup(0);
int defout = dup(1);
int childp[2];
int parentp[2];
if(pipe(childp) < 0) {
perror("child pipe");
exit(1);
}
if(pipe(parentp) < 0) {
perror("parent pipe");
exit(1);
}
dup2(childp[0], 0);
dup2(parentp[1], 1);
close(childp[0]);
close(parentp[1]);
int forker = fork();
if(forker < 0){
perror("fork");
exit(0);
}
if(forker == 0){ //check for child
dup2(childp[1],1);
close(childp[1]);
dup2(parentp[0], 0);
close(parentp[0]);
//running the subshell
char* arg[2];
arg[0] =(char *) getenv("_");
arg[1] = NULL;
execvp(arg[0], arg);
}
else {
for(start = 0; start < strlen(checker); start++){
write(1, checker+start, 1);
}
dup2(defout, 1);
close(defout);
close(childp[0]);
close(childp[1]);
close(parentp[0]);
close(parentp[1]);
char check;
start = 0;
while (read(0, &check, 1) != 0){
if(check == '\n') {
buff1[start] = ' ';
}
else {
buff1[start] = check;
}
start++;
}
buff1[start] = '\0';
dup2(defin, 0);
close(defin);
}
waitpid(forker, NULL, 0);
start = 0;
while(start < strlen(buff1)){
unput(buff1[strlen(buff1) - 1 - start]);
start++;
}
yylval.string_val = strdup(strdup(checker));
}
YY_BREAK
case 12:
YY_RULE_SETUP
#line 200 "shell.l"
{
/* Assume that file names have only alpha chars */
int start = 1;
int end = 1;
int j = 0;
end = strlen(yytext)-1;
char *stringer = (char*)malloc(sizeof(char) * end);
if(yytext[0] == '"' && yytext[end] == '"'){
strncpy(stringer, yytext+start, end-1);
}
else{
strcpy(stringer, yytext);