Create SFFS library out of HGFS

[minix.git] / commands / lex / misc.c

/* misc - miscellaneous flex routines */

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Vern Paxson.
 * 
 * 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: (1) source distributions retain
 * this entire copyright notice and comment, and (2) distributions including
 * binaries display the following acknowledgement:  ``This product includes
 * software developed by the University of California, Berkeley and its
 * contributors'' in the documentation or other materials provided with the
 * distribution and in all advertising materials mentioning features or use
 * of this software.  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 ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

/* $Header$ */

#include "flexdef.h"


void action_define( defname, value )
char *defname;
int value;
        {
        char buf[MAXLINE];

        if ( (int) strlen( defname ) > MAXLINE / 2 )
                {
                format_pinpoint_message( _( "name \"%s\" ridiculously long" ), 
                        defname );
                return;
                }

        sprintf( buf, "#define %s %d\n", defname, value );
        add_action( buf );
        }


void add_action( new_text )
char *new_text;
        {
        int len = strlen( new_text );

        while ( len + action_index >= action_size - 10 /* slop */ )
                {
                int new_size = action_size * 2;

                if ( new_size <= 0 )
                        /* Increase just a little, to try to avoid overflow
                         * on 16-bit machines.
                         */
                        action_size += action_size / 8;
                else
                        action_size = new_size;

                action_array =
                        reallocate_character_array( action_array, action_size );
                }

        strcpy( &action_array[action_index], new_text );

        action_index += len;
        }


/* allocate_array - allocate memory for an integer array of the given size */

void *allocate_array( size, element_size )
int size;
size_t element_size;
        {
        register void *mem;
        size_t num_bytes = element_size * size;

        mem = flex_alloc( num_bytes );
        if ( ! mem )
                flexfatal(
                        _( "memory allocation failed in allocate_array()" ) );

        return mem;
        }


/* all_lower - true if a string is all lower-case */

int all_lower( str )
register char *str;
        {
        while ( *str )
                {
                if ( ! isascii( (Char) *str ) || ! islower( *str ) )
                        return 0;
                ++str;
                }

        return 1;
        }


/* all_upper - true if a string is all upper-case */

int all_upper( str )
register char *str;
        {
        while ( *str )
                {
                if ( ! isascii( (Char) *str ) || ! isupper( *str ) )
                        return 0;
                ++str;
                }

        return 1;
        }


/* bubble - bubble sort an integer array in increasing order
 *
 * synopsis
 *   int v[n], n;
 *   void 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;
                                }
        }


/* check_char - checks a character to make sure it's within the range
 *              we're expecting.  If not, generates fatal error message
 *              and exits.
 */

void check_char( c )
int c;
        {
        if ( c >= CSIZE )
                lerrsf( _( "bad character '%s' detected in check_char()" ),
                        readable_form( c ) );

        if ( c >= csize )
                lerrsf(
                _( "scanner requires -8 flag to use the character %s" ),
                        readable_form( c ) );
        }



/* clower - replace upper-case letter to lower-case */

Char clower( c )
register int c;
        {
        return (Char) ((isascii( c ) && isupper( c )) ? tolower( c ) : c);
        }


/* copy_string - returns a dynamically allocated copy of a string */

char *copy_string( str )
register const char *str;
        {
        register const char *c1;
        register char *c2;
        char *copy;
        unsigned int size;

        /* find length */
        for ( c1 = str; *c1; ++c1 )
                ;

        size = (c1 - str + 1) * sizeof( char );
        copy = (char *) flex_alloc( size );

        if ( copy == NULL )
                flexfatal( _( "dynamic memory failure in copy_string()" ) );

        for ( c2 = copy; (*c2++ = *str++) != 0; )
                ;

        return copy;
        }


/* copy_unsigned_string -
 *    returns a dynamically allocated copy of a (potentially) unsigned string
 */

Char *copy_unsigned_string( str )
register Char *str;
        {
        register Char *c;
        Char *copy;

        /* find length */
        for ( c = str; *c; ++c )
                ;

        copy = allocate_Character_array( c - str + 1 );

        for ( c = copy; (*c++ = *str++) != 0; )
                ;

        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 */

void dataend()
        {
        if ( datapos > 0 )
                dataflush();

        /* add terminator for initialization; { for vi */
        outn( "    } ;\n" );

        dataline = 0;
        datapos = 0;
        }


/* dataflush - flush generated data statements */

void dataflush()
        {
        outc( '\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.
                 */
                outc( '\n' );
                dataline = 0;
                }

        /* Reset the number of characters written on the current line. */
        datapos = 0;
        }


/* flexerror - report an error message and terminate */

void flexerror( msg )
const char msg[];
        {
        fprintf( stderr, "%s: %s\n", program_name, msg );
        flexend( 1 );
        }


/* flexfatal - report a fatal error message and terminate */

void flexfatal( msg )
const char msg[];
        {
        fprintf( stderr, _( "%s: fatal internal error, %s\n" ),
                program_name, msg );
        exit( 1 );
        }


/* htoi - convert a hexadecimal digit string to an integer value */

int htoi( str )
Char str[];
        {
        unsigned int result;

        (void) sscanf( (char *) str, "%x", &result );

        return result;
        }


/* lerrif - report an error message formatted with one integer argument */

void lerrif( msg, arg )
const char msg[];
int arg;
        {
        char errmsg[MAXLINE];
        (void) sprintf( errmsg, msg, arg );
        flexerror( errmsg );
        }


/* lerrsf - report an error message formatted with one string argument */

void lerrsf( msg, arg )
const char msg[], arg[];
        {
        char errmsg[MAXLINE];

        (void) sprintf( errmsg, msg, arg );
        flexerror( errmsg );
        }


/* line_directive_out - spit out a "#line" statement */

void line_directive_out( output_file, do_infile )
FILE *output_file;
int do_infile;
        {
        char directive[MAXLINE], filename[MAXLINE];
        char *s1, *s2, *s3;
        static char line_fmt[] = "#line %d \"%s\"\n";

        if ( ! gen_line_dirs )
                return;

        if ( (do_infile && ! infilename) || (! do_infile && ! outfilename) )
                /* don't know the filename to use, skip */
                return;

        s1 = do_infile ? infilename : outfilename;
        s2 = filename;
        s3 = &filename[sizeof( filename ) - 2];

        while ( s2 < s3 && *s1 )
                {
                if ( *s1 == '\\' )
                        /* Escape the '\' */
                        *s2++ = '\\';

                *s2++ = *s1++;
                }

        *s2 = '\0';

        if ( do_infile )
                sprintf( directive, line_fmt, linenum, filename );
        else
                {
                if ( output_file == stdout )
                        /* Account for the line directive itself. */
                        ++out_linenum;

                sprintf( directive, line_fmt, out_linenum, filename );
                }

        /* If output_file is nil then we should put the directive in
         * the accumulated actions.
         */
        if ( output_file )
                {
                fputs( directive, output_file );
                }
        else
                add_action( directive );
        }


/* mark_defs1 - mark the current position in the action array as
 *               representing where the user's section 1 definitions end
 *               and the prolog begins
 */
void mark_defs1()
        {
        defs1_offset = 0;
        action_array[action_index++] = '\0';
        action_offset = prolog_offset = action_index;
        action_array[action_index] = '\0';
        }


/* mark_prolog - mark the current position in the action array as
 *               representing the end of the action prolog
 */
void mark_prolog()
        {
        action_array[action_index++] = '\0';
        action_offset = action_index;
        action_array[action_index] = '\0';
        }


/* mk2data - generate a data statement for a two-dimensional array
 *
 * Generates a data statement initializing the current 2-D array to "value".
 */
void mk2data( value )
int value;
        {
        if ( datapos >= NUMDATAITEMS )
                {
                outc( ',' );
                dataflush();
                }

        if ( datapos == 0 )
                /* Indent. */
                out( "    " );

        else
                outc( ',' );

        ++datapos;

        out_dec( "%5d", value );
        }


/* mkdata - generate a data statement
 *
 * Generates a data statement initializing the current array element to
 * "value".
 */
void mkdata( value )
int value;
        {
        if ( datapos >= NUMDATAITEMS )
                {
                outc( ',' );
                dataflush();
                }

        if ( datapos == 0 )
                /* Indent. */
                out( "    " );
        else
                outc( ',' );

        ++datapos;

        out_dec( "%5d", value );
        }


/* myctoi - return the integer represented by a string of digits */

int myctoi( array )
char array[];
        {
        int val = 0;

        (void) sscanf( array, "%d", &val );

        return val;
        }


/* myesc - return character corresponding to escape sequence */

Char myesc( array )
Char array[];
        {
        Char c, esc_char;

        switch ( array[1] )
                {
                case 'b': return '\b';
                case 'f': return '\f';
                case 'n': return '\n';
                case 'r': return '\r';
                case 't': return '\t';

#if __STDC__
                case 'a': return '\a';
                case 'v': return '\v';
#else
                case 'a': return '\007';
                case 'v': return '\013';
#endif

                case '0':
                case '1':
                case '2':
                case '3':
                case '4':
                case '5':
                case '6':
                case '7':
                        { /* \<octal> */
                        int 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] ) &&
                                isxdigit( (char) 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 */

int otoi( str )
Char str[];
        {
        unsigned int result;

        (void) sscanf( (char *) str, "%o", &result );
        return result;
        }


/* out - various flavors of outputing a (possibly formatted) string for the
 *       generated scanner, keeping track of the line count.
 */

void out( str )
const char str[];
        {
        fputs( str, stdout );
        out_line_count( str );
        }

void out_dec( fmt, n )
const char fmt[];
int n;
        {
        printf( fmt, n );
        out_line_count( fmt );
        }

void out_dec2( fmt, n1, n2 )
const char fmt[];
int n1, n2;
        {
        printf( fmt, n1, n2 );
        out_line_count( fmt );
        }

void out_hex( fmt, x )
const char fmt[];
unsigned int x;
        {
        printf( fmt, x );
        out_line_count( fmt );
        }

void out_line_count( str )
const char str[];
        {
        register int i;

        for ( i = 0; str[i]; ++i )
                if ( str[i] == '\n' )
                        ++out_linenum;
        }

void out_str( fmt, str )
const char fmt[], str[];
        {
        printf( fmt, str );
        out_line_count( fmt );
        out_line_count( str );
        }

void out_str3( fmt, s1, s2, s3 )
const char fmt[], s1[], s2[], s3[];
        {
        printf( fmt, s1, s2, s3 );
        out_line_count( fmt );
        out_line_count( s1 );
        out_line_count( s2 );
        out_line_count( s3 );
        }

void out_str_dec( fmt, str, n )
const char fmt[], str[];
int n;
        {
        printf( fmt, str, n );
        out_line_count( fmt );
        out_line_count( str );
        }

void outc( c )
int c;
        {
        putc( c, stdout );

        if ( c == '\n' )
                ++out_linenum;
        }

void outn( str )
const char str[];
        {
        puts( str );
        out_line_count( str );
        ++out_linenum;
        }


/* readable_form - return the the human-readable form of a character
 *
 * 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 '\b': return "\\b";
                        case '\f': return "\\f";
                        case '\n': return "\\n";
                        case '\r': return "\\r";
                        case '\t': return "\\t";

#if __STDC__
                        case '\a': return "\\a";
                        case '\v': return "\\v";
#endif

                        default:
                                (void) sprintf( rform, "\\%.3o",
                                                (unsigned int) 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;
size_t element_size;
        {
        register void *new_array;
        size_t num_bytes = element_size * size;

        new_array = flex_realloc( array, num_bytes );
        if ( ! new_array )
                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 = (char *) 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.
                                 */
                                out( buf );
                        else
                                outn( 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;
        {
        out_dec2( " {%4d,%4d },", element_v, element_n );

        datapos += TRANS_STRUCT_PRINT_LENGTH;

        if ( datapos >= 79 - TRANS_STRUCT_PRINT_LENGTH )
                {
                outc( '\n' );

                if ( ++dataline % 10 == 0 )
                        outc( '\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_t) 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;
size_t size_in_bytes;
        {
        register char *rp, *rp_end;

        rp = region_ptr;
        rp_end = region_ptr + size_in_bytes;

        while ( rp < rp_end )
                *rp++ = 0;
        }