495 lines
11 KiB
C
495 lines
11 KiB
C
|
|
/********************************************
|
|
fin.c
|
|
copyright 1991, Michael D. Brennan
|
|
|
|
This is a source file for mawk, an implementation of
|
|
the AWK programming language.
|
|
|
|
Mawk is distributed without warranty under the terms of
|
|
the GNU General Public License, version 2, 1991.
|
|
********************************************/
|
|
|
|
/*$Log: fin.c,v $
|
|
/*Revision 1.1.1.1 1993/03/21 09:45:37 cgd
|
|
/*initial import of 386bsd-0.1 sources
|
|
/*
|
|
* Revision 5.2 92/02/21 13:30:08 brennan
|
|
* fixed bug that free'd FILENAME twice if
|
|
* command line was var=value only
|
|
*
|
|
* Revision 5.1 91/12/05 07:56:02 brennan
|
|
* 1.1 pre-release
|
|
*
|
|
*/
|
|
|
|
/* fin.c */
|
|
|
|
#include "mawk.h"
|
|
#include "fin.h"
|
|
#include "memory.h"
|
|
#include "bi_vars.h"
|
|
#include "field.h"
|
|
#include "symtype.h"
|
|
#include "scan.h"
|
|
|
|
#if HAVE_FCNTL_H
|
|
#include <fcntl.h>
|
|
#endif
|
|
|
|
/* This file handles input buffering */
|
|
|
|
#ifndef MSDOS_MSC
|
|
extern int errno ;
|
|
#endif
|
|
int PROTO(isatty, (int) ) ;
|
|
|
|
static FIN *PROTO( next_main, (int) ) ;
|
|
static char *PROTO( enlarge_fin_buffer, (FIN *) ) ;
|
|
static void PROTO(set_main_to_stdin, (void) ) ;
|
|
int PROTO( is_cmdline_assign, (char *) ) ; /* also used by init */
|
|
|
|
FIN *FINdopen( fd, main_flag )
|
|
int fd , main_flag ;
|
|
{ register FIN *fin = (FIN *) zmalloc( sizeof(FIN) ) ;
|
|
|
|
fin->fd = fd ;
|
|
fin->flags = main_flag ? (MAIN_FLAG|START_FLAG) : START_FLAG ;
|
|
fin->buffp = fin->buff = (char *) zmalloc(BUFFSZ+1) ;
|
|
fin->nbuffs = 1 ;
|
|
fin->buff[0] = 0 ;
|
|
|
|
if ( isatty(fd) && rs_shadow.type == SEP_CHAR
|
|
&& rs_shadow.c == '\n' )
|
|
{
|
|
/* interactive, i.e., line buffer this file */
|
|
if ( fd == 0 ) fin->fp = stdin ;
|
|
else
|
|
if ( !(fin->fp = fdopen(fd, "r")) )
|
|
{ errmsg(errno, "fdopen failed") ; exit(1) ; }
|
|
}
|
|
else fin->fp = (FILE *) 0 ;
|
|
|
|
return fin ;
|
|
}
|
|
|
|
FIN *FINopen( filename, main_flag )
|
|
char *filename ;
|
|
int main_flag ;
|
|
{ int fd ;
|
|
int oflag = O_RDONLY ;
|
|
|
|
#if MSDOS && NO_BINMODE==0
|
|
int bm = binmode() & 1 ;
|
|
if ( bm ) oflag |= O_BINARY ;
|
|
#endif
|
|
|
|
if ( filename[0] == '-' && filename[1] == 0 )
|
|
{
|
|
#if MSDOS && NO_BINMODE==0
|
|
if ( bm ) setmode(0, O_BINARY) ;
|
|
#endif
|
|
return FINdopen(0, main_flag) ;
|
|
}
|
|
|
|
#ifdef THINK_C
|
|
if ( (fd = open( filename , oflag )) == -1 )
|
|
#else
|
|
if ( (fd = open( filename , oflag, 0 )) == -1 )
|
|
#endif
|
|
{ errmsg( errno, "cannot open %s" , filename ) ;
|
|
return (FIN *) 0 ; }
|
|
|
|
return FINdopen( fd, main_flag ) ;
|
|
}
|
|
|
|
/* frees the buffer and fd, but leaves FIN structure until
|
|
the user calls close() */
|
|
|
|
void FINsemi_close(fin)
|
|
register FIN *fin ;
|
|
{ static char dead = 0 ;
|
|
|
|
if ( fin->buff != &dead )
|
|
{
|
|
zfree(fin->buff, fin->nbuffs*BUFFSZ + 1) ;
|
|
|
|
if ( fin->fd )
|
|
if ( fin->fp ) (void) fclose(fin->fp) ;
|
|
else (void) close(fin->fd) ;
|
|
|
|
fin->buff = fin->buffp = &dead ; /* marks it semi_closed */
|
|
}
|
|
/* else was already semi_closed */
|
|
}
|
|
|
|
/* user called close() on input file */
|
|
void FINclose( fin )
|
|
FIN *fin ;
|
|
{
|
|
FINsemi_close(fin) ;
|
|
zfree( fin , sizeof(FIN) ) ;
|
|
}
|
|
|
|
/* return one input record as determined by RS,
|
|
from input file (FIN) fin
|
|
*/
|
|
|
|
char *FINgets( fin, len_p )
|
|
FIN *fin ;
|
|
unsigned *len_p ;
|
|
{ register char *p, *q ;
|
|
unsigned match_len ;
|
|
unsigned r ;
|
|
|
|
restart :
|
|
|
|
if ( ! (p = fin->buffp)[0] ) /* need a refill */
|
|
{
|
|
if ( fin->flags & EOF_FLAG )
|
|
if ( fin->flags & MAIN_FLAG )
|
|
{ fin = next_main(0) ; goto restart ; }
|
|
else
|
|
{ *len_p = 0 ; return (char *) 0 ; }
|
|
|
|
if ( fin->fp ) /* line buffering */
|
|
if ( ! fgets(fin->buff, BUFFSZ+1, fin->fp) )
|
|
{
|
|
fin->flags |= EOF_FLAG ;
|
|
fin->buff[0] = 0 ;
|
|
fin->buffp = fin->buff ;
|
|
goto restart ; /* might be main_fin */
|
|
}
|
|
else /* return this line */
|
|
{
|
|
if ( !(p = strchr(fin->buff, '\n')) )
|
|
p = fin->buff + BUFFSZ + 1 ; /* unlikely to occur */
|
|
|
|
*p = 0 ; *len_p = p - fin->buff ;
|
|
fin->buffp = p ;
|
|
#ifdef THINK_C
|
|
/*
|
|
* I still don't understand why this is needed, unless fgets()
|
|
* also does this conversion internally for no good reason. :-(
|
|
*/
|
|
for ( p = fin->buff ; *p ; ++p )
|
|
{
|
|
if (*p == '\n') *p = '\r';
|
|
else if (*p == '\r') *p = '\n';
|
|
}
|
|
#endif
|
|
return fin->buff ;
|
|
}
|
|
else /* block buffering */
|
|
{
|
|
if ( (r = fillbuff(fin->fd, fin->buff, fin->nbuffs*BUFFSZ)) == 0 )
|
|
{
|
|
fin->flags |= EOF_FLAG ;
|
|
fin->buffp = fin->buff ;
|
|
goto restart ; /* might be main */
|
|
}
|
|
else
|
|
if ( r < fin->nbuffs*BUFFSZ ) fin->flags |= EOF_FLAG ;
|
|
|
|
p = fin->buffp = fin->buff ;
|
|
|
|
if ( fin->flags & START_FLAG )
|
|
{
|
|
fin->flags &= ~START_FLAG ;
|
|
if ( rs_shadow.type == SEP_MLR )
|
|
{ /* trim blank lines from front of file */
|
|
while ( *p == '\n' ) p++ ;
|
|
fin->buffp = p ;
|
|
if ( *p == 0 ) goto restart ;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
retry:
|
|
|
|
switch( rs_shadow.type )
|
|
{
|
|
case SEP_CHAR :
|
|
q = strchr(p, rs_shadow.c) ;
|
|
match_len = 1 ;
|
|
break ;
|
|
|
|
case SEP_STR :
|
|
q = str_str(p, ((STRING *) rs_shadow.ptr)->str,
|
|
match_len = ((STRING *) rs_shadow.ptr)->len ) ;
|
|
break ;
|
|
|
|
case SEP_MLR :
|
|
case SEP_RE :
|
|
q = re_pos_match(p, rs_shadow.ptr, &match_len) ;
|
|
/* if the match is at the end, there might still be
|
|
more to match in the file */
|
|
if ( q && q[match_len] == 0 && ! (fin->flags & EOF_FLAG))
|
|
q = (char *) 0 ;
|
|
break ;
|
|
|
|
default :
|
|
bozo("type of rs_shadow") ;
|
|
}
|
|
|
|
if ( q )
|
|
{ /* the easy and normal case */
|
|
*q = 0 ; *len_p = q - p ;
|
|
fin->buffp = q + match_len ;
|
|
return p ;
|
|
}
|
|
|
|
if ( fin->flags & EOF_FLAG )
|
|
{ /* last line without a record terminator */
|
|
*len_p = r = strlen(p) ; fin->buffp = p+r ;
|
|
|
|
if ( rs_shadow.type == SEP_MLR && fin->buffp[-1] == '\n'
|
|
&& r != 0 )
|
|
{ (*len_p)-- ; * -- fin->buffp = 0 ; }
|
|
return p ;
|
|
}
|
|
|
|
if ( p == fin->buff )
|
|
{ /* current record is too big for the input buffer, grow buffer */
|
|
p = enlarge_fin_buffer(fin) ;
|
|
}
|
|
else
|
|
{
|
|
/* move a partial line to front of buffer and try again */
|
|
unsigned rr ;
|
|
|
|
p = (char *) memcpy( fin->buff, p, SIZE_T(r = strlen(p)) ) ;
|
|
q = p+r ; rr = fin->nbuffs*BUFFSZ - r ;
|
|
|
|
if ( (r = fillbuff(fin->fd, q, rr)) < rr ) fin->flags |= EOF_FLAG ;
|
|
}
|
|
goto retry ;
|
|
}
|
|
|
|
static char *enlarge_fin_buffer(fin)
|
|
FIN *fin ;
|
|
{
|
|
unsigned r ;
|
|
unsigned oldsize = fin->nbuffs*BUFFSZ+1 ;
|
|
|
|
fin->buffp =
|
|
fin->buff = (char *) zrealloc(fin->buff, oldsize, oldsize+BUFFSZ);
|
|
fin->nbuffs++ ;
|
|
|
|
r = fillbuff(fin->fd, fin->buff + (oldsize-1) , BUFFSZ ) ;
|
|
if ( r < BUFFSZ ) fin->flags |= EOF_FLAG ;
|
|
|
|
return fin->buff ;
|
|
}
|
|
|
|
/*--------
|
|
target is big enough to hold size + 1 chars
|
|
on exit the back of the target is zero terminated
|
|
*--------------*/
|
|
unsigned fillbuff(fd, target, size)
|
|
int fd ;
|
|
register char *target ;
|
|
unsigned size ;
|
|
{ register int r ;
|
|
unsigned entry_size = size ;
|
|
#ifdef THINK_C
|
|
register char *p = target;
|
|
#endif
|
|
|
|
while ( size )
|
|
switch( r = read(fd, target, size) )
|
|
{ case -1 :
|
|
errmsg(errno, "read error") ;
|
|
exit(1) ;
|
|
|
|
case 0 :
|
|
goto out ;
|
|
|
|
default :
|
|
target += r ; size -= r ;
|
|
break ;
|
|
}
|
|
|
|
out :
|
|
*target = 0 ;
|
|
#ifdef THINK_C
|
|
/*
|
|
* I still don't understand why this is needed, unless read() also does
|
|
* this conversion internally for no good reason. :-(
|
|
*/
|
|
for ( ; *p ; ++p )
|
|
{
|
|
if (*p == '\r')
|
|
*p = '\n';
|
|
else if (*p == '\n')
|
|
*p = '\r';
|
|
}
|
|
#endif
|
|
return entry_size - size ;
|
|
}
|
|
|
|
/* main_fin is a handle to the main input stream
|
|
== 0 never been opened */
|
|
|
|
FIN *main_fin ;
|
|
ARRAY Argv ; /* to the user this is ARGV */
|
|
static double argi = 1.0 ; /* index of next ARGV[argi] to try to open */
|
|
|
|
|
|
static void set_main_to_stdin()
|
|
{
|
|
cell_destroy( FILENAME ) ;
|
|
FILENAME->type = C_STRING ;
|
|
FILENAME->ptr = (PTR) new_STRING( "-") ;
|
|
main_fin = FINdopen(0, 1) ;
|
|
}
|
|
|
|
|
|
void open_main()
|
|
{ CELL argc ;
|
|
|
|
#if MSDOS && NO_BINMODE==0 /* set input modes */
|
|
int k = binmode() ;
|
|
|
|
if ( k & 1 ) setmode(0, O_BINARY) ;
|
|
if ( k & 2 ) { setmode(1,O_BINARY) ; setmode(2,O_BINARY) ; }
|
|
#endif
|
|
|
|
(void) cellcpy(&argc, ARGC) ;
|
|
if ( argc.type != C_DOUBLE ) cast1_to_d(&argc) ;
|
|
|
|
if ( argc.dval == 1.0 ) set_main_to_stdin() ;
|
|
else (void) next_main(1) ;
|
|
}
|
|
|
|
static FIN *next_main(open_flag)
|
|
int open_flag ; /* called by open_main() if on */
|
|
{
|
|
register CELL *cp ;
|
|
CELL argc ; /* copy of ARGC */
|
|
CELL c_argi ; /* cell copy of argi */
|
|
CELL argval ; /* copy of ARGV[c_argi] */
|
|
|
|
|
|
argval.type = C_NOINIT ;
|
|
c_argi.type = C_DOUBLE ;
|
|
|
|
if ( main_fin ) FINclose(main_fin) ;
|
|
cell_destroy( FILENAME ) ;
|
|
FILENAME->type = C_NOINIT ;
|
|
/* so don't free again if we go to set_main_to_stdin() */
|
|
cell_destroy( FNR ) ;
|
|
FNR->type = C_DOUBLE ;
|
|
FNR->dval = 0.0 ;
|
|
|
|
if ( cellcpy(&argc, ARGC)->type != C_DOUBLE )
|
|
cast1_to_d(&argc) ;
|
|
|
|
while ( argi < argc.dval )
|
|
{
|
|
c_argi.dval = argi ;
|
|
argi += 1.0 ;
|
|
|
|
if ( !(cp = array_find( Argv, &c_argi, NO_CREATE)) )
|
|
continue ; /* its deleted */
|
|
|
|
/* make a copy so we can cast w/o side effect */
|
|
cell_destroy(&argval) ;
|
|
cp = cellcpy(&argval, cp) ;
|
|
if ( cp->type < C_STRING ) cast1_to_s(cp) ;
|
|
if ( string(cp)->len == 0 ) continue ;
|
|
|
|
/* it might be a command line assignment */
|
|
if ( is_cmdline_assign(string(cp)->str) ) continue ;
|
|
|
|
/* try to open it -- we used to continue on failure,
|
|
but posix says we should quit */
|
|
if ( ! (main_fin = FINopen( string(cp)->str, 1 )) ) mawk_exit(1) ;
|
|
|
|
/* success */
|
|
(void) cellcpy(FILENAME , cp ) ;
|
|
free_STRING( string(cp) ) ;
|
|
return main_fin ;
|
|
}
|
|
/* failure */
|
|
cell_destroy(&argval) ;
|
|
|
|
if ( open_flag ) /* all arguments were null or assignment */
|
|
{ set_main_to_stdin() ; return main_fin ; }
|
|
|
|
/* real failure */
|
|
FILENAME->type = C_STRING ;
|
|
FILENAME->ptr = (PTR) new_STRING( "" ) ;
|
|
|
|
{ /* this is how we mark EOF on main_fin */
|
|
static char dead_buff = 0 ;
|
|
static FIN dead_main = {0, (FILE*)0, &dead_buff, &dead_buff,
|
|
1, EOF_FLAG} ;
|
|
|
|
return main_fin = &dead_main ;
|
|
/* since MAIN_FLAG is not set, FINgets won't call next_main() */
|
|
}
|
|
}
|
|
|
|
|
|
int is_cmdline_assign(s)
|
|
char *s ;
|
|
{
|
|
register char *p ;
|
|
int c ;
|
|
SYMTAB *stp ;
|
|
CELL *cp ;
|
|
unsigned len ;
|
|
CELL cell ; /* used if command line assign to pseudo field */
|
|
CELL *fp = (CELL *) 0 ; /* ditto */
|
|
|
|
if ( scan_code[*(unsigned char *)s] != SC_IDCHAR ) return 0 ;
|
|
|
|
p = s+1 ;
|
|
while ( (c = scan_code[*(unsigned char*)p]) == SC_IDCHAR
|
|
|| c == SC_DIGIT ) p++ ;
|
|
|
|
if ( *p != '=' ) return 0 ;
|
|
|
|
*p = 0 ;
|
|
stp = find(s) ;
|
|
|
|
switch( stp->type )
|
|
{
|
|
case ST_NONE :
|
|
stp->type = ST_VAR ;
|
|
stp->stval.cp = cp = new_CELL() ;
|
|
break ;
|
|
|
|
case ST_VAR :
|
|
case ST_NR : /* !! no one will do this */
|
|
cp = stp->stval.cp ;
|
|
cell_destroy(cp) ;
|
|
break ;
|
|
|
|
case ST_FIELD :
|
|
/* must be pseudo field */
|
|
fp = stp->stval.cp ;
|
|
cp = &cell ;
|
|
break ;
|
|
|
|
default :
|
|
rt_error(
|
|
"cannot command line assign to %s\n\ttype clash or keyword"
|
|
, s ) ;
|
|
}
|
|
|
|
/* we need to keep ARGV[i] intact */
|
|
*p++ = '=' ;
|
|
len = strlen(p)+1 ;
|
|
/* posix says escape sequences are on from command line */
|
|
p = rm_escape( strcpy((char*)zmalloc(len), p) ) ;
|
|
cp->ptr = (PTR) new_STRING(p) ;
|
|
zfree(p,len) ;
|
|
check_strnum(cp) ; /* sets cp->type */
|
|
if ( fp ) /* move it from cell to pfield[] */
|
|
{ field_assign(fp, cp) ; free_STRING(string(cp)) ; }
|
|
return 1 ;
|
|
}
|