774 lines
14 KiB
C
774 lines
14 KiB
C
/* misc - miscellaneous flex routines */
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/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Vern Paxson.
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*
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* The United States Government has rights in this work pursuant
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* to contract no. DE-AC03-76SF00098 between the United States
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* Department of Energy and the University of California.
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*
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* Redistribution and use in source and binary forms are permitted provided
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* that: (1) source distributions retain this entire copyright notice and
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* comment, and (2) distributions including binaries display the following
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* acknowledgement: ``This product includes software developed by the
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* University of California, Berkeley and its contributors'' in the
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* documentation or other materials provided with the distribution and in
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* all advertising materials mentioning features or use of this software.
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* Neither the name of the University nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/* $Header: /home/ncvs/src/usr.bin/lex/misc.c,v 1.1.1.1 1994/08/24 13:10:32 csgr Exp $ */
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#include "flexdef.h"
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/* declare functions that have forward references */
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void dataflush PROTO((void));
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int otoi PROTO((Char []));
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void add_action( new_text )
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char *new_text;
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{
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int len = strlen( new_text );
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while ( len + action_index >= action_size - 10 /* slop */ )
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{
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action_size *= 2;
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action_array =
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reallocate_character_array( action_array, action_size );
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}
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strcpy( &action_array[action_index], new_text );
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action_index += len;
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}
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/* allocate_array - allocate memory for an integer array of the given size */
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void *allocate_array( size, element_size )
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int size, element_size;
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{
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register void *mem;
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/* On 16-bit int machines (e.g., 80286) we might be trying to
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* allocate more than a signed int can hold, and that won't
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* work. Cheap test:
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*/
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if ( element_size * size <= 0 )
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flexfatal( "request for < 1 byte in allocate_array()" );
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mem = flex_alloc( element_size * size );
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if ( mem == NULL )
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flexfatal( "memory allocation failed in allocate_array()" );
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return mem;
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}
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/* all_lower - true if a string is all lower-case */
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int all_lower( str )
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register char *str;
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{
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while ( *str )
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{
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if ( ! isascii( (Char) *str ) || ! islower( *str ) )
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return 0;
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++str;
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}
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return 1;
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}
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/* all_upper - true if a string is all upper-case */
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int all_upper( str )
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register char *str;
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{
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while ( *str )
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{
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if ( ! isascii( (Char) *str ) || ! isupper( *str ) )
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return 0;
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++str;
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}
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return 1;
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}
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/* bubble - bubble sort an integer array in increasing order
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*
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* synopsis
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* int v[n], n;
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* void bubble( v, n );
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*
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* description
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* sorts the first n elements of array v and replaces them in
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* increasing order.
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*
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* passed
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* v - the array to be sorted
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* n - the number of elements of 'v' to be sorted
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*/
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void bubble( v, n )
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int v[], n;
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{
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register int i, j, k;
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for ( i = n; i > 1; --i )
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for ( j = 1; j < i; ++j )
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if ( v[j] > v[j + 1] ) /* compare */
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{
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k = v[j]; /* exchange */
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v[j] = v[j + 1];
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v[j + 1] = k;
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}
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}
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/* check_char - checks a character to make sure it's within the range
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* we're expecting. If not, generates fatal error message
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* and exits.
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*/
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void check_char( c )
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int c;
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{
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if ( c >= CSIZE )
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lerrsf( "bad character '%s' detected in check_char()",
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readable_form( c ) );
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if ( c >= csize )
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lerrsf( "scanner requires -8 flag to use the character '%s'",
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readable_form( c ) );
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}
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/* clower - replace upper-case letter to lower-case */
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Char clower( c )
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register int c;
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{
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return (Char) ((isascii( c ) && isupper( c )) ? tolower( c ) : c);
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}
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/* copy_string - returns a dynamically allocated copy of a string */
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char *copy_string( str )
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register char *str;
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{
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register char *c;
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char *copy;
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/* find length */
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for ( c = str; *c; ++c )
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;
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copy = (char *) flex_alloc( (c - str + 1) * sizeof( char ) );
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if ( copy == NULL )
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flexfatal( "dynamic memory failure in copy_string()" );
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for ( c = copy; (*c++ = *str++); )
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;
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return copy;
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}
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/* copy_unsigned_string -
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* returns a dynamically allocated copy of a (potentially) unsigned string
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*/
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Char *copy_unsigned_string( str )
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register Char *str;
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{
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register Char *c;
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Char *copy;
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/* find length */
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for ( c = str; *c; ++c )
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;
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copy = allocate_Character_array( c - str + 1 );
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for ( c = copy; (*c++ = *str++); )
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;
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return copy;
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}
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/* cshell - shell sort a character array in increasing order
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*
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* synopsis
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*
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* Char v[n];
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* int n, special_case_0;
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* cshell( v, n, special_case_0 );
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*
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* description
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* Does a shell sort of the first n elements of array v.
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* If special_case_0 is true, then any element equal to 0
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* is instead assumed to have infinite weight.
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*
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* passed
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* v - array to be sorted
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* n - number of elements of v to be sorted
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*/
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void cshell( v, n, special_case_0 )
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Char v[];
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int n, special_case_0;
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{
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int gap, i, j, jg;
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Char k;
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for ( gap = n / 2; gap > 0; gap = gap / 2 )
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for ( i = gap; i < n; ++i )
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for ( j = i - gap; j >= 0; j = j - gap )
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{
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jg = j + gap;
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if ( special_case_0 )
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{
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if ( v[jg] == 0 )
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break;
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else if ( v[j] != 0 && v[j] <= v[jg] )
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break;
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}
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else if ( v[j] <= v[jg] )
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break;
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k = v[j];
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v[j] = v[jg];
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v[jg] = k;
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}
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}
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/* dataend - finish up a block of data declarations */
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void dataend()
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{
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if ( datapos > 0 )
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dataflush();
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/* add terminator for initialization; { for vi */
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puts( " } ;\n" );
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dataline = 0;
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datapos = 0;
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}
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/* dataflush - flush generated data statements */
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void dataflush()
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{
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putchar( '\n' );
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if ( ++dataline >= NUMDATALINES )
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{
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/* Put out a blank line so that the table is grouped into
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* large blocks that enable the user to find elements easily.
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*/
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putchar( '\n' );
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dataline = 0;
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}
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/* Reset the number of characters written on the current line. */
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datapos = 0;
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}
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/* flexerror - report an error message and terminate */
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void flexerror( msg )
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char msg[];
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{
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fprintf( stderr, "%s: %s\n", program_name, msg );
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flexend( 1 );
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}
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/* flexfatal - report a fatal error message and terminate */
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void flexfatal( msg )
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char msg[];
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{
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fprintf( stderr, "%s: fatal internal error, %s\n", program_name, msg );
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exit( 1 );
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}
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/* lerrif - report an error message formatted with one integer argument */
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void lerrif( msg, arg )
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char msg[];
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int arg;
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{
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char errmsg[MAXLINE];
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(void) sprintf( errmsg, msg, arg );
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flexerror( errmsg );
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}
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/* lerrsf - report an error message formatted with one string argument */
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void lerrsf( msg, arg )
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char msg[], arg[];
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{
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char errmsg[MAXLINE];
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(void) sprintf( errmsg, msg, arg );
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flexerror( errmsg );
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}
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/* htoi - convert a hexadecimal digit string to an integer value */
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int htoi( str )
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Char str[];
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{
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unsigned int result;
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(void) sscanf( (char *) str, "%x", &result );
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return result;
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}
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/* is_hex_digit - returns true if a character is a valid hex digit, false
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* otherwise
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*/
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int is_hex_digit( ch )
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int ch;
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{
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if ( isdigit( ch ) )
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return 1;
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switch ( clower( ch ) )
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{
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case 'a':
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case 'b':
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case 'c':
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case 'd':
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case 'e':
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case 'f':
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return 1;
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default:
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return 0;
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}
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}
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/* line_directive_out - spit out a "# line" statement */
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void line_directive_out( output_file )
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FILE *output_file;
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{
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if ( infilename && gen_line_dirs )
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{
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char directive[MAXLINE];
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sprintf( directive, "# line %d \"%s\"\n", linenum, infilename );
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/* If output_file is nil then we should put the directive in
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* the accumulated actions.
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*/
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if ( output_file )
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fputs( directive, output_file );
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else
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add_action( directive );
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}
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}
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/* mark_defs1 - mark the current position in the action array as
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* representing where the user's section 1 definitions end
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* and the prolog begins
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*/
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void mark_defs1()
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{
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defs1_offset = 0;
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action_array[action_index++] = '\0';
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action_offset = prolog_offset = action_index;
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action_array[action_index] = '\0';
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}
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/* mark_prolog - mark the current position in the action array as
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* representing the end of the action prolog
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*/
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void mark_prolog()
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{
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action_array[action_index++] = '\0';
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action_offset = action_index;
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action_array[action_index] = '\0';
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}
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/* mk2data - generate a data statement for a two-dimensional array
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*
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* Generates a data statement initializing the current 2-D array to "value".
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*/
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void mk2data( value )
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int value;
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{
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if ( datapos >= NUMDATAITEMS )
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{
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putchar( ',' );
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dataflush();
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}
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if ( datapos == 0 )
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/* Indent. */
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fputs( " ", stdout );
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else
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putchar( ',' );
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++datapos;
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printf( "%5d", value );
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}
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/* mkdata - generate a data statement
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*
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* Generates a data statement initializing the current array element to
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* "value".
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*/
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void mkdata( value )
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int value;
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{
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if ( datapos >= NUMDATAITEMS )
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{
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putchar( ',' );
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dataflush();
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}
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if ( datapos == 0 )
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/* Indent. */
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fputs( " ", stdout );
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else
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putchar( ',' );
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++datapos;
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printf( "%5d", value );
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}
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/* myctoi - return the integer represented by a string of digits */
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int myctoi( array )
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char array[];
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{
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int val = 0;
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(void) sscanf( array, "%d", &val );
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return val;
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}
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/* myesc - return character corresponding to escape sequence */
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Char myesc( array )
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Char array[];
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{
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Char c, esc_char;
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switch ( array[1] )
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{
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case 'b': return '\b';
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case 'f': return '\f';
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case 'n': return '\n';
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case 'r': return '\r';
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case 't': return '\t';
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#ifdef __STDC__
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case 'a': return '\a';
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case 'v': return '\v';
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#else
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case 'a': return '\007';
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case 'v': return '\013';
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#endif
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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{ /* \<octal> */
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int sptr = 1;
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while ( isascii( array[sptr] ) &&
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isdigit( array[sptr] ) )
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/* Don't increment inside loop control
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* because if isdigit() is a macro it might
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* expand into multiple increments ...
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*/
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++sptr;
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c = array[sptr];
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array[sptr] = '\0';
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esc_char = otoi( array + 1 );
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array[sptr] = c;
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return esc_char;
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}
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case 'x':
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{ /* \x<hex> */
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int sptr = 2;
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while ( isascii( array[sptr] ) &&
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is_hex_digit( (char) array[sptr] ) )
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/* Don't increment inside loop control
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* because if isdigit() is a macro it might
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* expand into multiple increments ...
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*/
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++sptr;
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c = array[sptr];
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array[sptr] = '\0';
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esc_char = htoi( array + 2 );
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array[sptr] = c;
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return esc_char;
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}
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default:
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return array[1];
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}
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}
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/* otoi - convert an octal digit string to an integer value */
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int otoi( str )
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Char str[];
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{
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unsigned int result;
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(void) sscanf( (char *) str, "%o", &result );
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return result;
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}
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/* readable_form - return the the human-readable form of a character
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*
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* The returned string is in static storage.
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*/
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char *readable_form( c )
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register int c;
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{
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static char rform[10];
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if ( (c >= 0 && c < 32) || c >= 127 )
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{
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switch ( c )
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{
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case '\b': return "\\b";
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case '\f': return "\\f";
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case '\n': return "\\n";
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case '\r': return "\\r";
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case '\t': return "\\t";
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#ifdef __STDC__
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case '\a': return "\\a";
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case '\v': return "\\v";
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#endif
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default:
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(void) sprintf( rform, "\\%.3o",
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(unsigned int) c );
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return rform;
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}
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}
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else if ( c == ' ' )
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return "' '";
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else
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{
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rform[0] = c;
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rform[1] = '\0';
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return rform;
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}
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}
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/* reallocate_array - increase the size of a dynamic array */
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void *reallocate_array( array, size, element_size )
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void *array;
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int size, element_size;
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{
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register void *new_array;
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|
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/* Same worry as in allocate_array(): */
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if ( size * element_size <= 0 )
|
|
flexfatal(
|
|
"attempt to increase array size by less than 1 byte" );
|
|
|
|
new_array = flex_realloc( array, size * element_size );
|
|
|
|
if ( new_array == NULL )
|
|
flexfatal( "attempt to increase array size failed" );
|
|
|
|
return new_array;
|
|
}
|
|
|
|
|
|
/* skelout - write out one section of the skeleton file
|
|
*
|
|
* Description
|
|
* Copies skelfile or skel array to stdout until a line beginning with
|
|
* "%%" or EOF is found.
|
|
*/
|
|
void skelout()
|
|
{
|
|
char buf_storage[MAXLINE];
|
|
char *buf = buf_storage;
|
|
int do_copy = 1;
|
|
|
|
/* Loop pulling lines either from the skelfile, if we're using
|
|
* one, or from the skel[] array.
|
|
*/
|
|
while ( skelfile ?
|
|
(fgets( buf, MAXLINE, skelfile ) != NULL) :
|
|
((buf = skel[skel_ind++]) != 0) )
|
|
{ /* copy from skel array */
|
|
if ( buf[0] == '%' )
|
|
{ /* control line */
|
|
switch ( buf[1] )
|
|
{
|
|
case '%':
|
|
return;
|
|
|
|
case '+':
|
|
do_copy = C_plus_plus;
|
|
break;
|
|
|
|
case '-':
|
|
do_copy = ! C_plus_plus;
|
|
break;
|
|
|
|
case '*':
|
|
do_copy = 1;
|
|
break;
|
|
|
|
default:
|
|
flexfatal(
|
|
"bad line in skeleton file" );
|
|
}
|
|
}
|
|
|
|
else if ( do_copy )
|
|
{
|
|
if ( skelfile )
|
|
/* Skeleton file reads include final
|
|
* newline, skel[] array does not.
|
|
*/
|
|
fputs( buf, stdout );
|
|
else
|
|
printf( "%s\n", buf );
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/* transition_struct_out - output a yy_trans_info structure
|
|
*
|
|
* outputs the yy_trans_info structure with the two elements, element_v and
|
|
* element_n. Formats the output with spaces and carriage returns.
|
|
*/
|
|
|
|
void transition_struct_out( element_v, element_n )
|
|
int element_v, element_n;
|
|
{
|
|
printf( "%7d, %5d,", element_v, element_n );
|
|
|
|
datapos += TRANS_STRUCT_PRINT_LENGTH;
|
|
|
|
if ( datapos >= 75 )
|
|
{
|
|
putchar( '\n' );
|
|
|
|
if ( ++dataline % 10 == 0 )
|
|
putchar( '\n' );
|
|
|
|
datapos = 0;
|
|
}
|
|
}
|
|
|
|
|
|
/* The following is only needed when building flex's parser using certain
|
|
* broken versions of bison.
|
|
*/
|
|
void *yy_flex_xmalloc( size )
|
|
int size;
|
|
{
|
|
void *result = flex_alloc( size );
|
|
|
|
if ( ! result )
|
|
flexfatal( "memory allocation failed in yy_flex_xmalloc()" );
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
/* zero_out - set a region of memory to 0
|
|
*
|
|
* Sets region_ptr[0] through region_ptr[size_in_bytes - 1] to zero.
|
|
*/
|
|
|
|
void zero_out( region_ptr, size_in_bytes )
|
|
char *region_ptr;
|
|
int size_in_bytes;
|
|
{
|
|
register char *rp, *rp_end;
|
|
|
|
rp = region_ptr;
|
|
rp_end = region_ptr + size_in_bytes;
|
|
|
|
while ( rp < rp_end )
|
|
*rp++ = 0;
|
|
}
|