mirror of
https://github.com/bulletphysics/bullet3
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346 lines
6.2 KiB
C
346 lines
6.2 KiB
C
/*
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* Copyright 1993-2002 Christopher Seiwald and Perforce Software, Inc.
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*
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* This file is part of Jam - see jam.c for Copyright information.
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*/
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/*
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* variable.c - handle jam multi-element variables
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*
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* External routines:
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*
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* var_defines() - load a bunch of variable=value settings
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* var_string() - expand a string with variables in it
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* var_get() - get value of a user defined symbol
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* var_set() - set a variable in jam's user defined symbol table
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* var_swap() - swap a variable's value with the given one
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* var_done() - free variable tables
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*
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* Internal routines:
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*
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* var_enter() - make new var symbol table entry, returning var ptr
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* var_dump() - dump a variable to stdout
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*
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* 04/13/94 (seiwald) - added shorthand L0 for null list pointer
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* 08/23/94 (seiwald) - Support for '+=' (append to variable)
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* 01/22/95 (seiwald) - split environment variables at blanks or :'s
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* 05/10/95 (seiwald) - split path variables at SPLITPATH (not :)
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* 09/11/00 (seiwald) - defunct var_list() removed
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* 10/22/02 (seiwald) - list_new() now does its own newstr()/copystr()
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* 11/04/02 (seiwald) - const-ing for string literals
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*/
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# include "jam.h"
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# include "lists.h"
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# include "parse.h"
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# include "variable.h"
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# include "expand.h"
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# include "hash.h"
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# include "newstr.h"
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static struct hash *varhash = 0;
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/*
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* VARIABLE - a user defined multi-value variable
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*/
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typedef struct _variable VARIABLE ;
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struct _variable {
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const char *symbol;
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LIST *value;
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} ;
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static VARIABLE *var_enter( const char *symbol );
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static void var_dump( const char *symbol, LIST *value, const char *what );
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/*
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* var_defines() - load a bunch of variable=value settings
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*
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* If variable name ends in PATH, split value at :'s.
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* Otherwise, split at blanks.
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*/
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void
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var_defines( const char **e )
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{
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for( ; *e; e++ )
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{
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const char *val;
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/* Just say "no": windows defines this in the env, */
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/* but we don't want it to override our notion of OS. */
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if( !strcmp( *e, "OS=Windows_NT" ) )
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continue;
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# ifdef OS_MAC
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/* On the mac (MPW), the var=val is actually var\0val */
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/* Think different. */
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if( ( val = strchr( *e, '=' ) ) || ( val = *e + strlen( *e ) ) )
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# else
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if( val = strchr( *e, '=' ) )
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# endif
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{
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LIST *l = L0;
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const char *pp, *p;
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# ifdef OS_MAC
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char split = ',';
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# else
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char split = ' ';
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# endif
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char buf[ MAXSYM ];
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/* Split *PATH at :'s, not spaces */
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if( val - 4 >= *e )
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{
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if( !strncmp( val - 4, "PATH", 4 ) ||
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!strncmp( val - 4, "Path", 4 ) ||
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!strncmp( val - 4, "path", 4 ) )
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split = SPLITPATH;
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}
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/* Do the split */
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for( pp = val + 1; p = strchr( pp, split ); pp = p + 1 )
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{
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strncpy( buf, pp, p - pp );
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buf[ p - pp ] = '\0';
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l = list_new( l, buf, 0 );
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}
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l = list_new( l, pp, 0 );
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/* Get name */
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strncpy( buf, *e, val - *e );
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buf[ val - *e ] = '\0';
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var_set( buf, l, VAR_SET );
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}
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}
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}
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/*
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* var_string() - expand a string with variables in it
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*
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* Copies in to out; doesn't modify targets & sources.
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*/
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int
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var_string(
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const char *in,
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char *out,
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int outsize,
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LOL *lol )
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{
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char *out0 = out;
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char *oute = out + outsize - 1;
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while( *in )
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{
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char *lastword;
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int dollar = 0;
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/* Copy white space */
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while( isspace( *in ) )
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{
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if( out >= oute )
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return -1;
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*out++ = *in++;
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}
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lastword = out;
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/* Copy non-white space, watching for variables */
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while( *in && !isspace( *in ) )
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{
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if( out >= oute )
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return -1;
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if( in[0] == '$' && in[1] == '(' )
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dollar++;
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*out++ = *in++;
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}
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/* If a variable encountered, expand it and and embed the */
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/* space-separated members of the list in the output. */
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if( dollar )
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{
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LIST *l = var_expand( L0, lastword, out, lol, 0 );
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out = lastword;
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while( l )
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{
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int so = strlen( l->string );
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if( out + so >= oute )
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return -1;
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strcpy( out, l->string );
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out += so;
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/* Separate with space */
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if( l = list_next( l ) )
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*out++ = ' ';
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}
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list_free( l );
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}
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}
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if( out >= oute )
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return -1;
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*out++ = '\0';
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return out - out0;
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}
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/*
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* var_get() - get value of a user defined symbol
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*
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* Returns NULL if symbol unset.
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*/
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LIST *
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var_get( const char *symbol )
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{
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VARIABLE var, *v = &var;
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v->symbol = symbol;
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if( varhash && hashcheck( varhash, (HASHDATA **)&v ) )
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{
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if( DEBUG_VARGET )
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var_dump( v->symbol, v->value, "get" );
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return v->value;
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}
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return 0;
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}
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/*
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* var_set() - set a variable in jam's user defined symbol table
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*
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* 'flag' controls the relationship between new and old values of
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* the variable: SET replaces the old with the new; APPEND appends
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* the new to the old; DEFAULT only uses the new if the variable
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* was previously unset.
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*
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* Copies symbol. Takes ownership of value.
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*/
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void
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var_set(
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const char *symbol,
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LIST *value,
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int flag )
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{
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VARIABLE *v = var_enter( symbol );
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if( DEBUG_VARSET )
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var_dump( symbol, value, "set" );
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switch( flag )
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{
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case VAR_SET:
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/* Replace value */
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list_free( v->value );
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v->value = value;
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break;
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case VAR_APPEND:
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/* Append value */
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v->value = list_append( v->value, value );
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break;
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case VAR_DEFAULT:
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/* Set only if unset */
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if( !v->value )
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v->value = value;
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else
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list_free( value );
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break;
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}
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}
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/*
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* var_swap() - swap a variable's value with the given one
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*/
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LIST *
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var_swap(
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const char *symbol,
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LIST *value )
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{
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VARIABLE *v = var_enter( symbol );
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LIST *oldvalue = v->value;
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if( DEBUG_VARSET )
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var_dump( symbol, value, "set" );
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v->value = value;
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return oldvalue;
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}
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/*
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* var_enter() - make new var symbol table entry, returning var ptr
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*/
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static VARIABLE *
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var_enter( const char *symbol )
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{
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VARIABLE var, *v = &var;
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if( !varhash )
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varhash = hashinit( sizeof( VARIABLE ), "variables" );
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v->symbol = symbol;
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v->value = 0;
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if( hashenter( varhash, (HASHDATA **)&v ) )
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v->symbol = newstr( symbol ); /* never freed */
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return v;
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}
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/*
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* var_dump() - dump a variable to stdout
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*/
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static void
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var_dump(
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const char *symbol,
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LIST *value,
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const char *what )
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{
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printf( "%s %s = ", what, symbol );
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list_print( value );
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printf( "\n" );
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}
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/*
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* var_done() - free variable tables
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*/
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void
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var_done()
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{
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hashdone( varhash );
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}
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