4.4BSD/usr/src/usr.bin/lex/misc.c
/*-
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Vern Paxson of Lawrence Berkeley Laboratory.
*
* The United States Government has rights in this work pursuant
* to contract no. DE-AC03-76SF00098 between the United States
* Department of Energy and the University of California.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static char sccsid[] = "@(#)misc.c 8.1 (Berkeley) 6/6/93";
#endif /* not lint */
/* misc - miscellaneous flex routines */
#include <ctype.h>
#include <stdlib.h>
#include "flexdef.h"
/* ANSI C does not guarantee that isascii() is defined */
#ifndef isascii
#define isascii(c) ((c) <= 0177)
#endif
/* declare functions that have forward references */
void dataflush PROTO(());
int otoi PROTO((Char []));
/* action_out - write the actions from the temporary file to lex.yy.c
*
* synopsis
* action_out();
*
* Copies the action file up to %% (or end-of-file) to lex.yy.c
*/
void action_out()
{
char buf[MAXLINE];
while ( fgets( buf, MAXLINE, temp_action_file ) != NULL )
if ( buf[0] == '%' && buf[1] == '%' )
break;
else
fputs( buf, stdout );
}
/* allocate_array - allocate memory for an integer array of the given size */
void *allocate_array( size, element_size )
int size, element_size;
{
register void *mem;
/* on 16-bit int machines (e.g., 80286) we might be trying to
* allocate more than a signed int can hold, and that won't
* work. Cheap test:
*/
if ( element_size * size <= 0 )
flexfatal( "request for < 1 byte in allocate_array()" );
mem = (void *) malloc( (unsigned) (element_size * size) );
if ( mem == NULL )
flexfatal( "memory allocation failed in allocate_array()" );
return ( mem );
}
/* all_lower - true if a string is all lower-case
*
* synopsis:
* Char *str;
* int all_lower();
* true/false = all_lower( str );
*/
int all_lower( str )
register Char *str;
{
while ( *str )
{
if ( ! isascii( *str ) || ! islower( *str ) )
return ( 0 );
++str;
}
return ( 1 );
}
/* all_upper - true if a string is all upper-case
*
* synopsis:
* Char *str;
* int all_upper();
* true/false = all_upper( str );
*/
int all_upper( str )
register Char *str;
{
while ( *str )
{
if ( ! isascii( *str ) || ! isupper( (char) *str ) )
return ( 0 );
++str;
}
return ( 1 );
}
/* bubble - bubble sort an integer array in increasing order
*
* synopsis
* int v[n], n;
* bubble( v, n );
*
* description
* sorts the first n elements of array v and replaces them in
* increasing order.
*
* passed
* v - the array to be sorted
* n - the number of elements of 'v' to be sorted */
void bubble( v, n )
int v[], n;
{
register int i, j, k;
for ( i = n; i > 1; --i )
for ( j = 1; j < i; ++j )
if ( v[j] > v[j + 1] ) /* compare */
{
k = v[j]; /* exchange */
v[j] = v[j + 1];
v[j + 1] = k;
}
}
/* clower - replace upper-case letter to lower-case
*
* synopsis:
* Char clower();
* int c;
* c = clower( c );
*/
Char clower( c )
register int c;
{
return ( (isascii( c ) && isupper( c )) ? tolower( c ) : c );
}
/* copy_string - returns a dynamically allocated copy of a string
*
* synopsis
* char *str, *copy, *copy_string();
* copy = copy_string( str );
*/
char *copy_string( str )
register char *str;
{
register char *c;
char *copy;
/* find length */
for ( c = str; *c; ++c )
;
copy = malloc( (unsigned) ((c - str + 1) * sizeof( char )) );
if ( copy == NULL )
flexfatal( "dynamic memory failure in copy_string()" );
for ( c = copy; (*c++ = *str++); )
;
return ( copy );
}
/* copy_unsigned_string -
* returns a dynamically allocated copy of a (potentially) unsigned string
*
* synopsis
* Char *str, *copy, *copy_unsigned_string();
* copy = copy_unsigned_string( str );
*/
Char *copy_unsigned_string( str )
register Char *str;
{
register Char *c;
Char *copy;
/* find length */
for ( c = str; *c; ++c )
;
copy = (Char *) malloc( (unsigned) ((c - str + 1) * sizeof( Char )) );
if ( copy == NULL )
flexfatal( "dynamic memory failure in copy_unsigned_string()" );
for ( c = copy; (*c++ = *str++); )
;
return ( copy );
}
/* cshell - shell sort a character array in increasing order
*
* synopsis
*
* Char v[n];
* int n, special_case_0;
* cshell( v, n, special_case_0 );
*
* description
* does a shell sort of the first n elements of array v.
* If special_case_0 is true, then any element equal to 0
* is instead assumed to have infinite weight.
*
* passed
* v - array to be sorted
* n - number of elements of v to be sorted
*/
void cshell( v, n, special_case_0 )
Char v[];
int n, special_case_0;
{
int gap, i, j, jg;
Char k;
for ( gap = n / 2; gap > 0; gap = gap / 2 )
for ( i = gap; i < n; ++i )
for ( j = i - gap; j >= 0; j = j - gap )
{
jg = j + gap;
if ( special_case_0 )
{
if ( v[jg] == 0 )
break;
else if ( v[j] != 0 && v[j] <= v[jg] )
break;
}
else if ( v[j] <= v[jg] )
break;
k = v[j];
v[j] = v[jg];
v[jg] = k;
}
}
/* dataend - finish up a block of data declarations
*
* synopsis
* dataend();
*/
void dataend()
{
if ( datapos > 0 )
dataflush();
/* add terminator for initialization */
puts( " } ;\n" );
dataline = 0;
datapos = 0;
}
/* dataflush - flush generated data statements
*
* synopsis
* dataflush();
*/
void dataflush()
{
putchar( '\n' );
if ( ++dataline >= NUMDATALINES )
{
/* put out a blank line so that the table is grouped into
* large blocks that enable the user to find elements easily
*/
putchar( '\n' );
dataline = 0;
}
/* reset the number of characters written on the current line */
datapos = 0;
}
/* flexerror - report an error message and terminate
*
* synopsis
* char msg[];
* flexerror( msg );
*/
void flexerror( msg )
char msg[];
{
fprintf( stderr, "%s: %s\n", program_name, msg );
flexend( 1 );
}
/* flexfatal - report a fatal error message and terminate
*
* synopsis
* char msg[];
* flexfatal( msg );
*/
void flexfatal( msg )
char msg[];
{
fprintf( stderr, "%s: fatal internal error, %s\n", program_name, msg );
flexend( 1 );
}
/* flex_gettime - return current time
*
* synopsis
* char *flex_gettime(), *time_str;
* time_str = flex_gettime();
*
* note
* the routine name has the "flex_" prefix because of name clashes
* with Turbo-C
*/
/* include sys/types.h to use time_t and make lint happy */
#ifndef MS_DOS
#ifndef VMS
#include <sys/types.h>
#else
#include <types.h>
#endif
#endif
#ifdef MS_DOS
#include <time.h>
typedef long time_t;
#endif
char *flex_gettime()
{
time_t t, time();
char *result, *ctime(), *copy_string();
t = time( (long *) 0 );
result = copy_string( ctime( &t ) );
/* get rid of trailing newline */
result[24] = '\0';
return ( result );
}
/* lerrif - report an error message formatted with one integer argument
*
* synopsis
* char msg[];
* int arg;
* lerrif( msg, arg );
*/
void lerrif( msg, arg )
char msg[];
int arg;
{
char errmsg[MAXLINE];
(void) sprintf( errmsg, msg, arg );
flexerror( errmsg );
}
/* lerrsf - report an error message formatted with one string argument
*
* synopsis
* char msg[], arg[];
* lerrsf( msg, arg );
*/
void lerrsf( msg, arg )
char msg[], arg[];
{
char errmsg[MAXLINE];
(void) sprintf( errmsg, msg, arg );
flexerror( errmsg );
}
/* htoi - convert a hexadecimal digit string to an integer value
*
* synopsis:
* int val, htoi();
* Char str[];
* val = htoi( str );
*/
int htoi( str )
Char str[];
{
int result;
(void) sscanf( (char *) str, "%x", &result );
return ( result );
}
/* is_hex_digit - returns true if a character is a valid hex digit, false
* otherwise
*
* synopsis:
* int true_or_false, is_hex_digit();
* int ch;
* val = is_hex_digit( ch );
*/
int is_hex_digit( ch )
int ch;
{
if ( isdigit( ch ) )
return ( 1 );
switch ( clower( ch ) )
{
case 'a':
case 'b':
case 'c':
case 'd':
case 'e':
case 'f':
return ( 1 );
default:
return ( 0 );
}
}
/* line_directive_out - spit out a "# line" statement */
void line_directive_out( output_file_name )
FILE *output_file_name;
{
if ( infilename && gen_line_dirs )
fprintf( output_file_name, "# line %d \"%s\"\n", linenum, infilename );
}
/* mk2data - generate a data statement for a two-dimensional array
*
* synopsis
* int value;
* mk2data( value );
*
* generates a data statement initializing the current 2-D array to "value"
*/
void mk2data( value )
int value;
{
if ( datapos >= NUMDATAITEMS )
{
putchar( ',' );
dataflush();
}
if ( datapos == 0 )
/* indent */
fputs( " ", stdout );
else
putchar( ',' );
++datapos;
printf( "%5d", value );
}
/* mkdata - generate a data statement
*
* synopsis
* int value;
* mkdata( value );
*
* generates a data statement initializing the current array element to
* "value"
*/
void mkdata( value )
int value;
{
if ( datapos >= NUMDATAITEMS )
{
putchar( ',' );
dataflush();
}
if ( datapos == 0 )
/* indent */
fputs( " ", stdout );
else
putchar( ',' );
++datapos;
printf( "%5d", value );
}
/* myctoi - return the integer represented by a string of digits
*
* synopsis
* Char array[];
* int val, myctoi();
* val = myctoi( array );
*
*/
int myctoi( array )
Char array[];
{
int val = 0;
(void) sscanf( (char *) array, "%d", &val );
return ( val );
}
/* myesc - return character corresponding to escape sequence
*
* synopsis
* Char array[], c, myesc();
* c = myesc( array );
*
*/
Char myesc( array )
Char array[];
{
Char c, esc_char;
register int sptr;
switch ( array[1] )
{
case 'a': return ( '\007' );
case 'b': return ( '\b' );
case 'f': return ( '\f' );
case 'n': return ( '\n' );
case 'r': return ( '\r' );
case 't': return ( '\t' );
case 'v': return ( '\v' );
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
{ /* \<octal> */
sptr = 1;
while ( isascii( array[sptr] ) && isdigit( array[sptr] ) )
/* don't increment inside loop control because if
* isdigit() is a macro it might expand into multiple
* increments ...
*/
++sptr;
c = array[sptr];
array[sptr] = '\0';
esc_char = otoi( array + 1 );
array[sptr] = c;
return ( esc_char );
}
case 'x':
{ /* \x<hex> */
int sptr = 2;
while ( isascii( array[sptr] ) && is_hex_digit( array[sptr] ) )
/* don't increment inside loop control because if
* isdigit() is a macro it might expand into multiple
* increments ...
*/
++sptr;
c = array[sptr];
array[sptr] = '\0';
esc_char = htoi( array + 2 );
array[sptr] = c;
return ( esc_char );
}
default:
return ( array[1] );
}
}
/* otoi - convert an octal digit string to an integer value
*
* synopsis:
* int val, otoi();
* Char str[];
* val = otoi( str );
*/
int otoi( str )
Char str[];
{
int result;
(void) sscanf( (char *) str, "%o", &result );
return ( result );
}
/* readable_form - return the the human-readable form of a character
*
* synopsis:
* int c;
* char *readable_form();
* <string> = readable_form( c );
*
* The returned string is in static storage.
*/
char *readable_form( c )
register int c;
{
static char rform[10];
if ( (c >= 0 && c < 32) || c >= 127 )
{
switch ( c )
{
case '\n': return ( "\\n" );
case '\t': return ( "\\t" );
case '\f': return ( "\\f" );
case '\r': return ( "\\r" );
case '\b': return ( "\\b" );
default:
(void) sprintf( rform, "\\%.3o", c );
return ( rform );
}
}
else if ( c == ' ' )
return ( "' '" );
else
{
rform[0] = c;
rform[1] = '\0';
return ( rform );
}
}
/* reallocate_array - increase the size of a dynamic array */
void *reallocate_array( array, size, element_size )
void *array;
int size, element_size;
{
register void *new_array;
/* same worry as in allocate_array(): */
if ( size * element_size <= 0 )
flexfatal( "attempt to increase array size by less than 1 byte" );
new_array =
(void *) realloc( (char *)array, (unsigned) (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
*
* synopsis
* skelout();
*
* DESCRIPTION
* Copies from skelfile to stdout until a line beginning with "%%" or
* EOF is found.
*/
void skelout()
{
char buf[MAXLINE];
while ( fgets( buf, MAXLINE, skelfile ) != NULL )
if ( buf[0] == '%' && buf[1] == '%' )
break;
else
fputs( buf, stdout );
}
/* transition_struct_out - output a yy_trans_info structure
*
* synopsis
* int element_v, element_n;
* transition_struct_out( element_v, element_n );
*
* 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;
}
}